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    • 专利摘要:
    drive belt. The present invention relates to a transmission belt which contains a core wire extending in a longitudinal direction of the belt, an adhesive rubber layer in contact with at least a part of the core wire, a surface rubber layer back formed on one surface of the adhesive rubber layer, and an inner surface rubber layer formed on the other surface of the adhesive rubber layer and engaging or contacting a pulley, wherein the adhesive rubber layer is formed of a composition of vulcanized rubber containing a rubber component, a fatty acid amide and a silica.
    公开号:BR112014026780B1
    申请号:R112014026780-4
    申请日:2013-04-22
    公开日:2021-08-10
    发明作者:Takeshi Nishiyama；Susumu Takaba；Hisato Ishiguro
    申请人:Mitsuboshi Belting Ltd.；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a drive belt, such as a V-belt, a splined V-belt or a flat belt, and in detail, refers to a drive belt having an excellent durability performance. BACKGROUND OF THE INVENTION
    [002] A friction drive belt, such as a V-belt, a splined V-belt or a flat belt, and a simultaneous power transmission belt, such as a toothed belt, are conventionally known as a drive belt. that transmits energy. Such drive belts have a core wire embedded in a rubber body along a longitudinal direction of the belt, and their core wire plays a role in transmitting energy from a drive pulley to a driven pulley. Such transmission belts are generally provided with an adhesive rubber layer in order to improve the adhesiveness between the core wire of a rubber.
    [003] Patent Document 1 describes a rubber V-belt containing an extensible rubber layer and a compressed rubber layer, each having short fibers having highly elastic modules disposed in a direction of the width of the belt provided on the upper side and bottom of an adhesive rubber layer having a cord embedded therein, wherein the adhesive rubber layer is comprised of a rubber composition containing 100 parts by weight of a chloroprene rubber, from 1 to 20 parts by weight of at least a metal oxide vulcanizing agent selected from zinc oxide, magnesium oxide and lead oxide, from 5 to 30 parts by weight of silica, from 15 to 50 parts by weight of a reinforcing excipient, and from 2 to 10 parts by weight of bismaleimide. It is described that in such a rubber V-belt, the crosslink density can be increased through the bismaleimide of the composition to thereby form an adhesive rubber having a highly elastic modulus, hence the stress concentration between the adhesive rubber and a rubber containing fiber (a compressed rubber or an extensible rubber) is decreased, and additionally, since the adhesive rubber layer has excellent fatigue resistance, the life of the belt can be extended.
    [004] However, in a layer where a belt bends extremely and the load is high (for example, a state where the belt moves inwardly in a direction of the radius of a pulley and the belt bends outwardly , such as in a variable speed belt, or a state where the belt is flexibly connected to a plurality of pulleys, such as a V-ribbed belt), a mere increase in the elastic modulus (rubber hardness) of a layer adhesive is not sufficient to prevent interfacial peeling between the adhesive rubber layer and a compressed rubber layer (in an extensible rubber layer), and the peeling between a core wire and the adhesive rubber layer. Furthermore, in the case where the rubber hardness of the adhesive rubber layer is excessively increased, there is a possibility that the flexural fatigue strength is deteriorated.
    [005] On the other hand, in the case where the rubber hardness of an adhesive rubber layer is merely decreased (for example, the crosslink density is decreased by decreasing the amount of added reinforcing excipient, or using a smaller amount of a vulcanization-type composition ingredient) in order to improve flexural fatigue strength and tackiness, the big difference is generated in rubber hardness between a compressed rubber layer (or an extensible rubber layer) and the rubber layer. adhesive rubber, and peeling previously occurs at the interface between the adhesive rubber layer and the compressed rubber layer (or the extensible rubber layer). For that reason, it was complicated in the conventional technique to avoid interfacial peeling, and to improve durability without deterioration of flexural fatigue strength. STATE OF TECHNICAL DOCUMENTS PATENT DOCUMENT
    [006] PATENT DOCUMENT 1: JP-A-61-290255 SUMMARY OF THE INVENTION PROBLEMS THAT THE INVENTION IS INTENDED TO SOLVE
    [007] Accordingly, an objective of the present invention is to provide a transmission belt that prevents the interfacial peeling of an adhesive rubber layer from an inner surface layer and a back surface layer, and that has excellent durability without the deterioration of flexural fatigue strength. MEANS TO SOLVE PROBLEMS
    [008] As a result of serious investigations to achieve the above problems, the present inventors found that by forming an adhesive rubber layer of a transmission belt through a vulcanized rubber composition containing a rubber component, a fatty acid amide and a silica, the interfacial peeling of the adhesive rubber layer through an inner surface rubber layer and a back surface rubber layer is avoided, and the durability can be improved without deteriorating the flexural fatigue strength, and completed the present invention.
    [009] That is, the transmission belt according to the present invention is a belt containing a core wire extending in a longitudinal direction of the belt, an adhesive rubber layer (adhesive layer in contact with at least a portion of the wire of core, a back surface adhesive layer (back surface layer) formed on one surface of the adhesive rubber layer, and an inner surface adhesive layer (inner surface layer) formed on the other surface of the adhesive rubber layer, and if engaging or in contact with a pulley, wherein the adhesive rubber layer is formed by the vulcanized rubber composition containing a rubber component, a fatty acid amide and a silica. The ratio of fatty acid amide can be about 0 .3 to 10 parts by mass per 100 parts by mass of rubber component (raw material rubber) The ratio of fatty acid amide can be about 1 to 30 by mass per 100 parts s by mass of silica. The fatty acid amide can contain a fatty acid amide having an unsaturated or saturated higher fatty acid residue having 10 to 26 carbon atoms, or a higher amine residue having 10 to 26 carbon atoms. Silica can have a specific nitrogen adsorption surface area according to the BET method of about 50 to 400 m2/g. The rubber component may contain chloroprene rubber. The drive belt according to the present invention can be a friction drive belt. ADVANTAGEOUS EFFECTS OF THE INVENTION
    [010] In the present invention, due to the fact that an adhesive rubber layer of a transmission belt is formed by a vulcanized rubber composition containing a rubber component, a fatty acid amide and a silica, the interfacial peeling of the layer of adhesive rubber from an inner surface adhesive rubber layer and a back surface adhesive rubber layer (particularly an interfacial peeling between the adhesive rubber layer and the inner surface rubber layer) can be suppressed despite the hardness of the rubber of the adhesive rubber layer not be increased. As a result, belt durability can be improved without deteriorating bending fatigue strength. BRIEF DESCRIPTION OF THE DRAWINGS
    [011] FIG. 1 is a schematic cross-sectional view illustrating an example of a transmission belt of the present invention.
    [012] FIG.2 is a schematic view to describe the displacement durability test in the Examples. WAY TO CARRY OUT THE INVENTION [Vulcanized rubber composition with adhesive rubber layer]
    [013] The adhesive rubber layer (an adhesive layer) is provided in contact with at least a part of a core wire for the purpose of adhering the core wire and a rubber material forming a belt. The adhesive rubber layer of the present invention is formed of a vulcanized rubber composition containing a rubber component, a fatty acid amide and a silica.
    [014] In the present invention, because the fatty acid amide acts as a dispersant, the dispersibility of silica in the vulcanized rubber composition can be improved and the variation in the properties of the adhesive rubber layer can be small. Furthermore, silica has many silanol (-SiOH) groups as reactive functional groups on its surface, and can be chemically bonded with the rubber component through silanol groups. In the present invention, by combining the silica with the fatty acid amide, the silanol groups on the silica and the amide groups (-CONH- etc) on the fatty acid amide are interacted with each other, to thereby greatly improve the dispersibility of silica in the rubber composition, and, in addition, the adhesiveness between silica and rubber component can be improved. As a result, the mechanical characteristics (such as tensile stress and tear strength) of the adhesive rubber layer can be further improved. (Fatty acid amide)
    [015] The fatty acid amide acts as a dispersant, as described above, and additionally acts as an internal lubricant to the rubber composition. When it acts as an internal lubricant, the modulus of the adhesive rubber layer tends to be reduced (smoothed). However, the decrease in modulus can be suppressed by using silica in combination. That is, by using the fatty acid amide and silica in combination, mechanical characteristics can be improved without excessively increasing the hardness of the adhesive rubber layer. Furthermore, such a combination need not increase the rubber hardness of the adhesive rubber layer by compounding a large amount of an enhancer (reinforcing excipient) such as carbon black and cross-linking agent such as maleimide , and can improve the flexural fatigue capacity of a belt and fuel saving properties (in particular, fuel saving properties in the case where a belt moves with winding around small pulleys).
    [016] In addition, in the present invention, because the adhesive rubber layer contains the fatty acid amide, the fatty acid amide tarnishing (precipitates) or leaks on the surface (a part of the friction transmission surface) of the layer of adhesive rubber, and the fatty acid amide precipitate acts as an external lubricant. As a result, the friction coefficient of the surface of the adhesive rubber layer can be reduced. Particularly, on a friction drive belt, such as a V-belt (a rough edge belt or rough edge toothed V-belt), friction between the adhesive rubber layer and the pulley can be facilitated by reducing the coefficient of friction of the surface of the adhesive rubber layer in contact with the pulley, and this prevents excess shear force from acting for a layer of rubber in contact with a pulley during belt displacement, and can improve the belt's durability . That is, if the coefficient of friction is high, the shear force received from a pulley is increased, and the peeling of the adhesive rubber layer of the rubber layer from the inner surface rubber layer and the rubber layer of the back surface (particularly the inner surface rubber layer) and the generation of a crack in the surface of the inner surface rubber layer easily occurs, which leads to a short belt life; but such an occurrence can be suppressed.
    [017] The fatty acid amide has a long-chain fatty acid group (for example, a fatty acid group having from about 10 to 40 carbon atoms), and an amide group in its molecule, and is an agent thermally and chemically stable solid surfactant. Examples of the fatty acid amide include higher fatty acid monoamides (for example, C12-24 saturated or unsaturated fatty acid amides or monoamides, such as lauric amide, myristic amide, palmitic amide, stearic amide, hydroxystearic amide, oleic amide, amide ricinoleic, arachic amide, behenic amide, and erucamide); bis-amides of saturated or unsaturated higher fatty acids, eg alkylenebis saturated or unsaturated higher fatty acid amides (eg C12-24 saturated or unsaturated C1-10 alkylenebis fatty acid amides, such as methylenebis-lauric amide, methylenebis-stearic amide, methylenebis-hydroxystearic amide, methylenebis-oleic amide, ethylenebis-caprylic amide, ethylenebis-capric amide, ethylenebis-lauric amide, ethylenebis-stearic amide, ethylenebis-isostearic amide, ethylenebis-ethylene amide, ethylene biscue amide ethylenebis-oleic, tetramethylenebis-stearic amide, hexamethylenebis-stearic amide, hexamethylenebis-hydroxystearic amide, hexamethylenebis-oleic amide and hexamethylenebis-behenic amide), and bis-amides of dicarboxylic acid and higher amine (eg, bis-amides formed by reaction of a C6-12 alkane dicarboxylic acid and C12-24 higher amine, such as N,N'-diestearyl-adipic amide, N,N'-diestearyl-sebacic amide, N amide ,N'-dioleyl-adipic, and N,N'-dioleyl-sebacic amide).
    [018] Examples of the fatty acid amide further include aromatic bis-amides (eg bis-amides of an aromatic diamine and a higher saturated or unsaturated fatty acid, such as xylylene bis-stearic amide and bis-amides of a dicarboxylic acid aromatic and a higher amine, such as N,N'-diestearyl-phthalic acid amide), substituted amides (for example, higher fatty acid amides where a saturated or unsaturated C12-24 fatty acid residue is a bonded amide to a nitrogen atom of an amide group, such as N-lauryl lauric amide, N-palmityl palmitic amide, N-stearyl stearic amide, N-stearyl oleic amide, N-oleyl stearic amide, N-stearyl erucamide, and N amide -stearylhydroxy stearic), ester amides (for example, ester amides in which a hydroxyl group of the alkanolamine is ester-bonded to a higher fatty acid, and an amino group of the alkanolamine is amide-bonded to a C12-24 fatty acid, such as ethanolamine dipalmitate, ethanolamine diaste arate, ethanolamine dibehenate, propanolamine dipalmitate, and propanolamine distearate), alkanolamides (for example, methylolamides such as C12-24 fatty acid methylol monoamides, such as methylolestearic amide and methylolbeenic amide; and C12-24 fatty acid monoamide C2-4 alkyl N-hydroxy such as stearic monoethanol amide and erucic acid monoethanol amide), and substituted ureas (e.g., substituted ureas, wherein the higher fatty acid is amide-bonded to a urea nitrogen atom such as N-butyl-N-stearyl urea, N-phenyl-N'-stearyl urea, N-stearyl-N'-stearyl urea, xylylenebis-stearyl urea, tolylenebis-stearyl urea, hexamethylenebis-urea stearyl, and diphenylmethanebis-stearyl urea). In these fatty acid amides, the carbon number of the higher fatty acid or a higher amine (in the case of bismaleimide or the like, each higher fatty acid or each higher amine) can be from about 10 to 34 (for example, from 10 to 30, preferably from 10 to 28, more preferably from 10 to 26 and particularly preferably from 12 to 24). These fatty acid amides can be used alone or in combination of two or more types thereof.
    [019] The melting point of the fatty acid amide can be selected from a range of about 50 to 200 °C, and is generally from 65 to 150 °C, preferably from 75 to 130 °C (for example , from 80 to 120 °C), and more preferably from 90 to 110 °C (for example, from 95 to 105 °C).
    [020] In fatty acid amides, the carbon number of a carbon chain constituting a higher fatty acid residue or a higher amine residue is preferably, for example, about 10 to 26 (particularly 12 to 24). The reason for this is not clear, but it can be assumed that if a higher fatty acid residue or a higher amine residue has a very long structure, that is, it has a large number of carbons, the density of the amide groups in a molecule is relatively decreased to reduce the rate of interaction between the amide groups in the fatty acid amide and silanol groups in the silica, and as a result, the dispersibility of silica in the rubber composition and the adhesiveness between the silica and the rubber composition may not be sufficiently improved.
    [021] The proportion of the fatty acid amide is, for example, from 0.3 to 10 parts by mass, preferably from 0.4 to 8 parts by mass, and more preferably from 0.5 to 6 parts by mass ( in particular 1 to 5 parts by mass) per 100 parts by mass of the rubber component (raw material rubber). From the point of view of the excellent balance of various characteristics, it can be, for example, about 0.7 to 7 parts by mass (in particular, from 1 to 6.5 parts by mass). The proportion of the fatty acid amide is, for example, from 1 to 35 parts by mass, preferably from 1 to 30 parts by mass, more preferably from 1.5 to 25 parts by mass, and even more preferably from 2 to 20 parts by mass (in particular 3 to 15 parts by mass) per 100 parts by mass of silica. From the point of view of the excellent balance between various characteristics, it can be, for example, from about 2.5 to 30 parts by mass (in particular, from 3 to 25 parts by mass).
    [022] In the present invention, the mechanical characteristics of the adhesive rubber layer can be improved by properly adjusting the proportion of fatty acid amide. In addition, because the surface friction coefficient (a part of the friction transmission surface) can be appropriately reduced, the interfacial peeling of the adhesive rubber layer of an inner surface rubber layer or a rear surface rubber layer, due to the lateral pressure of a pulley during belt displacement, it can be avoided. Furthermore, because the hardness of the adhesive rubber layer is not excessively increased, the bending stress can be reduced, and the bending fatigue strength of the belt can be improved.
    [023] In the case where the proportion of fatty acid amide is very small, the interaction between silica and the fatty acid amide is not sufficient, and there is a possibility that the mechanical characteristics of the adhesive rubber layer are insufficient, or arise from the fatty acid amide on the surface of the rubber adhesive layer (a part of the traction transmission surface) is decreased, resulting in a decrease in the friction coefficient reducing effect. In relation to mechanical characteristics, in particular in a V-ribbed belt, if the tear strength of the adhesive rubber layer is low, the phenomenon where a core wire protrudes from an edge of a belt (an end of the (adhesive rubber layer) during belt displacement, ie a so-called bounce occurs, and the life of the belt becomes short.
    [024] On the other hand, in the case where the proportion of fatty acid amide is very large, there is a possibility that excess fatty acid amide that does not interact with silica acts as an internal lubricant, and the modulus of Vulcanized rubber composition forming the adhesive rubber layer is greatly reduced, or that excess fatty acid amide arises on the surface (the surface in contact with a core wire) of the adhesive rubber layer to form a coating film, and the adhesive strength between the adhesive rubber layer and the core wire is decreased. (Silica)
    [025] Silica is a voluminous and ultra-fine white powder formed by silicic acid and/or silicate, and has a plurality of silanol groups on its surface. Therefore, silica can be chemically bonded to the rubber component.
    [026] Silica includes dry silica, wet silica and surface treated silica. Furthermore, silica can also be classified into, for example, dry process white carbon, wet process white carbon, colloidal silica, and precipitated silica, depending on the classification by the processes. These silicas can be used alone or in combination of two or more types thereof. Of these, wet process white carbon containing hydrated silicic acid as a major component is preferred from the viewpoint of many surface silanol groups, and a strong chemical bond strength to a rubber.
    [027] Silica has an average particle diameter of, for example, from 1 to 1000 nm, preferably from 3 to 300 nm, and more preferably from 5 to 100 nm (for example, from 10 to 50 nm). In the case where the silica particle size is too large, the mechanical characteristics of the adhesive rubber layer are deteriorated; while if it is too small, it is difficult to disperse evenly.
    [028] Silica can be non-porous silica and can be porous silica. The specific surface area of nitrogen absorption by the BET method is, for example, from 50 to 400 m2/g, preferably from 70 to 350 m2/g, and more preferably from 100 to 300 m2/g (particularly from 150 to 250 m2/g). In the case where the specific surface area is very large, it is difficult to disperse evenly; while if the specific surface area is too small, the mechanical characteristics of the adhesive rubber layer are deteriorated.
    [029] The proportion of silica is, for example, from 1 to 100 parts by mass, preferably from 3 to 80 parts by mass, and more preferably from 5 to 40 parts by mass (for example, from 10 to 35 parts by mass mass), per 100 pieces by mass of the rubber component (raw material rubber). In the case where the proportion of silica is too large, the elasticity and adhesive strength of the rubber adhesive layer are deteriorated; while if it is too small, the rubber hardness of the adhesive rubber layer is deteriorated, and the strength and tear strength are also deteriorated. (Rubber component)
    [030] Examples of the rubber component include vulcanizable or cross-linked rubbers, for example, diene rubbers (for example, natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (nitrile rubber), or hydrogenated nitrile rubber), ethylene-α-olefin elastomers, chlorosulfonated polyethylene rubbers, alkylated chlorosulfonated polyethylene rubbers, epichlorohydrin rubbers, acrylic rubbers, silicone rubbers, rubbers urethane, and fluorine rubbers. These rubber components can be used alone or in combination of two or more types of them.
    [031] Of these, ethylene-α-olefin elastomers (eg ethylene-α-olefin rubbers such as ethylene-propylene rubber (EPR) and ethylene-propylene-diene monomer (eg EPDM)) and chloroprene rubbers are preferred, and chloroprene rubbers are particularly preferably contained. In the rubber component, the proportion of chloroprene rubber can be around 50% by mass or more (in particular from 80 to 100% by mass). Chloroprene rubber can be of the sulfur-modified type, and it can be of the unmodified sulfur type. Chloroprene rubber has high tack (cohesiveness), and a rubber composition containing chloroprene rubber as a major component generally tends to have a high coefficient of friction. However, in the present invention, the fatty acid amide acts as an external lubricant. Therefore, even if chloroprene rubber is used, the increase in the coefficient of friction can be suppressed. That is, in the case of using chloroprene rubber, the action of a fatty acid amide as an external lubricant is remarkably displayed. (Other additives)
    [032] If necessary, the vulcanized rubber composition to form the adhesive rubber layer may contain a vulcanizing agent or a cross-linking agent (or a type of cross-linking agent), a cross-linking agent, a vulcanization assistant, a vulcanization accelerator, a vulcanization retarder, a metal oxide (eg, zinc oxide, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide or oxide of aluminium), an enhancer (eg carbon black), a filler material (eg clay, calcium carbonate, talc, or mica), a softener (eg oils such as paraffin oil and naphthenic oil ), a processing agent or a processing aid (eg, stearic acid, metal salt of stearic acid, wax or paraffin), a tack-improving agent [eg, a co-condensed resorcin-formaldehyde, a resin amino (a condensate of a cyclic compound containing nitrogen and formaldehyde, for example, a melamine resin such as hexamethylol melamine and hexaalkoxymethyl melamine (for example hexamethoxymethyl melamine or hexabutoxymethyl melamine), a urea resin such as methylol urea, benzoguanamine resin such as urea resin methylolbenzoguanamine, etc.), and those co-condensates (such as a co-condensed resolcin-melamine-formaldehyde, etc], an antidegradant (eg, an antioxidant, a thermal antidegradant, an anti-cracking agent, or an antiozonant), a dye, a tackifier, a plasticizer, a coupling agent (for example a silane coupling agent), a stabilizer (for example an ultraviolet absorber or a thermal stabilizer), a flame retardant, a antistatic agent, and the like. Metal oxide can act as a cross-linking agent. In addition, the tack-improving agent, the co-condensed resorcin-formaldehyde and the amino resin can be an initial condensate (a prepolymer) of a cyclic nitrogen-containing compound such as resorcin and/or melamine, and formaldehyde .
    [033] As the vulcanizing agent or cross-linking agent, conventional components can be used according to the type of rubber component, and examples thereof include the metal oxides described above (for example, magnesium oxide or oxide of zinc), organic peroxides (eg diacyl peroxide, peroxyester or dialkyl peroxide), and sulfur vulcanizing agents. Examples of the sulfur vulcanizing agent include powdered sulfurs, precipitated sulfurs, colloidal sulfurs, insoluble sulfurs, highly dispersed sulfurs, and sulfur chlorides (for example, sulfur monochloride or sulfur dichloride). Such cross-linking agents or vulcanizing agents can be used alone or in combination of two or more types thereof. In the case where the rubber component is chloroprene rubber, metal oxide (eg magnesium oxide or zinc oxide) can be used as the vulcanizing agent or the cross-linking agent. Metal oxide can be used in combination with other vulcanizing agents (eg sulfur vulcanizing agent), and metal oxide and/or sulfur vulcanizing agent can be used alone or in combination with a vulcanizing accelerator .
    [034] The proportion of vulcanizing agent can be selected from a range of about 1 to 20 parts by mass per 100 parts by mass of rubber component, depending on the type of vulcanizing agent and rubber component. For example, the amount of organic peroxide used as a vulcanizing agent can be selected from a range of 1 to 8 parts by mass, preferably from 1.5 to 5 parts by mass, and more preferably from 2 to 4, 5 parts by mass, per 100 parts by mass of the rubber component. The proportion of the metal oxide can be selected from a range of 1 to 20 parts by mass, preferably from 3 to 17 parts by mass, and more preferably from 5 to 15 parts by mass (eg 7 to 13 parts by mass) per 100 parts by mass of the rubber component.
    [035] Examples of the cross-linking agent (a cross-linking aid or a co-agent) include conventional cross-linking aids, for example, (iso) polyfunctional cyanides [eg, triallyl isocyanurate (TAIC) or triallyl cyanurate (TAC)], polydiene (eg 1,2-polybutadiene), unsaturated carboxylic acid metal salts [eg zinc (meth)acrylate or magnesium (meth)acrylate], oximes (eg quinone dioxime), guanidines (eg, diphenyl guanidine), polyfunctional (meth)acrylates [eg, ethylene glycol di(meth)acrylate, butanediol di(meth)acrylate or trimethylolpropane tri(meth)acrylate], bismaleimides ( for example, aliphatic bismaleimides, such as N,N'-1,2-ethylene bismaleimide and 1,6'-bismaleimide-(2,2,4-trimethyl)-cyclohexane, and aromatic bismaleimides or bismaleimides, such as N, N'-m-phenylene-bismaleimide, 4-methyl-1,3-phenylene-bismaleimide, 4,4'-diphenylmethane-bismaleimide, 2,2-bis[4-(4-maleimi) da-phenoxy)phenyl]propane, 4,4'-diphenylether-bismaldehyde, 4,4'-diphenylsulfone-bismaleimide, and 1,3-bis(3-maleimide-phenoxy)-benzene. These cross-linking aids can be used alone or in combination of two or more types thereof. Of those cross-linking auxiliaries, bismaleimides (arenic bismaleimides or aromatic bismaleimides such as N,N'-m-phenylene dimaleimide) are preferred. The addition of bismaleimides can increase the degree of cross-linking to prevent adhesive wear.
    [036] The proportion of the cross-linking agent (cross-linking aid) can be selected from, for example, a range of about 0.01 to 10 parts by mass per 100 parts by mass of rubber component , in terms of solid content. However, since the rubber hardness of the rubber adhesive layer is not required to be excessively increased by virtue of the combination of the fatty acid amide and silica, the proportion of the cross-linking agent (particularly bismaleimides) it may be a comparatively small amount, and may be, for example, from 0.1 to 5 parts by mass, preferably from 0.3 to 4.8 parts by mass, and more preferably from 0.5 to 4.5 parts by mass (in particular from 1 to 4 parts by mass). Examples of the vulcanization accelerator include thiuram accelerators [e.g., tetramethyl thiuram monosulfide (TMTM), tetramethyl thiuram disulfide (TMTD), tetraethyl thiuram disulfide (TETD), tetrabutyl thiuram disulfide (TBTD), dipentamethylene thiuram tetrasulfide ( DPTT), or N,N'-dimethyl-N,N'-diphenyl thiuram disulfide], thiazole accelerators [e.g. 2-mercaptobenzothiazole, a zinc salt of 2-mercaptobenzothiazole, 2-mercaptothiazoline, dibenzothiazole disulfide, or 2-(4'-morpholinodithio)benzothiazole], sulfenamide accelerators [e.g., N-cyclohexyl-2-benzothiazil sulfenamide (CBS) or N,N'-dicyclohexyl-2-benzothiazil sulfenamide], bismaleimide accelerators ( for example, N,N'-m-phenylene-bismaleimide or N,N'-1,2-ethylene-bismaleimide), guanidines (for example, diphenyl guanidine or di-o-tolyl guanidine), urea or thiourea accelerators (for example ethylene thiourea), dithiocarbamates and xanthates. These vulcanization accelerators can be used alone or in combination of two or more types of them. Of these vulcanization accelerators, TMTD, DPTT, CBS and the like are widely used.
    [037] The proportion of the vulcanization accelerator can be, for example, from 0.1 to 15 parts by mass, preferably from 0.3 to 10 parts by mass, and more preferably from 0.5 to 5 parts by mass per 100 parts by mass of the rubber component, in terms of a solid content.
    [038] The proportion of the enhancer and the filler can be selected from a range of about 1 to 100 parts by mass per 100 parts by mass of rubber component. However, in the present invention, since the rubber hardness of the adhesive rubber layer is not required to be excessively increased, due to the combination of the fatty acid amide and silica, the ratio of the enhancer and the filler ( particularly, the enhancer such as carbon black) may be comparatively a small amount, and may be, for example, from 1 to 50 parts by mass, preferably from 3 to 30 parts by mass, and more preferably from 5 to 25 parts by mass. by mass (in particular, from 10 to 20 parts by mass).
    [039] The proportion of softener (oils such as naphthenic oil) can be, for example, from 1 to 30 parts by mass, and preferably from 3 to 20 parts by mass (for example, from 5 to 10 parts by mass) , per 100 parts by mass of the rubber component. In addition, the proportion of the processing agent or processing aid (eg stearic acid) can be, for example, 10 parts by mass or less (eg 0 to 10 parts by mass), preferably 0 0.1 to 5 parts by mass, and more preferably 0.3 to 3 parts by mass (in particular 0.5 to 2 parts by mass), per 100 parts by mass of the rubber component.
    [040] The proportion of the tack-improving agent (for example, co-condensed resorcin-formaldehyde or hexamethoxymethyl melanin) may be from 0.1 to 20 parts by mass, preferably from 0.3 to 10 parts by mass, and more preferably from 0.5 to 5 parts by mass (from 1 to 3 parts by mass) per 100 parts by mass of the rubber component.
    [041] The proportion of the antidegradant can be, for example, from 0.5 to 15 parts by mass, preferably from 1 to 10 parts by mass, and more preferably from 2.5 to 7.5 parts by mass (for example, 3 to 7 parts by mass) per 100 parts by mass of the rubber component. (Characteristics of the adhesive rubber layer)
    [042] The mechanical characteristics of the adhesive rubber layer can be properly selected depending on the required performance, and the rubber hardness can be, for example, in a range of 80 to 90° in the method according to JIS K6253 (2012). Since the mechanical characteristics are improved by the combination of fatty acid amide and silica, the hardness of the adhesive rubber layer is not required to be excessively increased, and the hardness of the rubber can be around 80 to 83° (particularly , from 80 to 82°). A rubber adhesive rubber layer having relatively high hardness can be formed, and the hardness of the rubber can be adjusted to, for example, from about 84 to 90° by large amounts of the composition of a strengthening excipient or a vulcanizing ingredient of makeup.
    [043] The thickness of the adhesive rubber layer can be suitably selected depending on the type of a belt, and can be, for example, from 0.4 to 3.0 mm, preferably from 0.6 to 2.2 mm, and more preferably from 0.8 to 1.4 mm. [Drive belt]
    [044] The transmission belt of the present invention contains the adhesive rubber layer. In detail, the transmission belt contains a core wire extending in the direction of the length of the belt, an adhesive rubber layer in contact with at least a portion of the core wire, a back surface rubber layer formed on a surface of the adhesive rubber layer, and an inner surface rubber layer formed on the other surface of the adhesive layer and on one side (inner side) surrounding or being in contact with a pulley. Examples of the drive belt include friction drive belts such as a V-belt, a splined V-belt and a flat belt, mesh drive belts such as a toothed belt. Of these, friction transmission belt such as a V-belt or a V-ribbed belt are preferred, and a V-belt in which the surface (a part of the friction transmission surface) of the adhesive rubber layer is in contact with a pulley (particularly a variable speed belt used in a transmission, in which the ratio of back transmission is continuously variable during belt travel) is particularly preferred. Examples of the V-belt include a rough edge belt and a rough edge toothed V-belt, which have sprocket teeth provided on the rubber layer side of the inner surface, or on both the rubber layer side of the inner surface and the back surface rubber layer side of the rough edge belt.
    [045] Figure. 1 is a schematic cross-sectional view illustrating an example of the drive belt (gross edge toothed V-belt) of the present invention. In this example, a core wire 2 is incorporated into an adhesive rubber layer 1, an inner surface rubber layer 3 is laminated onto a surface of the adhesive rubber layer 1, and a back surface rubber layer 4 is laminated onto the other surface of the adhesive rubber layer l. The core wire 2 is integrally incorporated as being sandwiched between a pair of adhesive rubber sheets. A reinforcing fabric 5 is laminated onto the inner surface rubber layer 3, and a serrated part 6 is formed by a serrated forming mold. The inner surface rubber layer laminate 3 and the reinforcing fabric 5 are integrally formed by vulcanizing the reinforcing fabric laminate and an inner surface rubber layer sheet (unvulcanized rubber sheet). (Core wire)
    [046] The adhesive rubber layer needs to be in contact with at least a part of the core wire, it is not limited to the mode in which the core wire is hidden in the adhesive rubber layer, it can be the mode in which the core wire core is incorporated between the adhesive rubber layer and the back surface rubber layer, or between the adhesive rubber layer and the inner surface rubber layer, and may be the embodiment in which a part of an adhesive rubber layer on that the adhesive rubber layer is in contact with a toothed portion which is formed so as to extend towards a back side (back side of the surface layer), or a side of the toothed portion (side of surface rubber layer) interior) with respect to the core wire, such as the toothed belt described in JP-A-2009-41768.
    [047] Examples of the fiber constituting the core wire include synthetic fibers, eg polyolefin fibers (eg polyethylene fiber or polypropylene fiber), polyamide fibers (eg 6 polyamide fiber, 66 polyamide fiber , polyamide fiber 46, or aramid fiber), polyalkylene arylate fibers [for example, C 6-14 C 2-4 alkylene poly arylate fibers such as polyethylene terephthalate (PET) fiber and polyethylene naphthalate (PEN) fiber )], vinylon fibers, polyvinyl alcohol fibers, and polyparaphenylene benzobisoxasol (PBO) fiber; natural fibers such as cotton, hemp and wool; and inorganic fibers such as carbon fibers. Of these, synthetic fibers such as polyester fiber or aramid fiber, and inorganic fibers such as glass fiber or carbon fiber are widely used from the point of view of high modulus, and polyester fibers such as terephthalate fiber. polyethylene or polyethylene naphthalate fiber, and aramid fibers are particularly preferred from the viewpoint that a belt slip ratio can be decreased. Polyester fibers can be a multi-filament yarn. The denier value of the core wire made up of the multifilament yarn can be, for example, from about 2,000 to 10,000 denier (particularly from 4,000 to 8,000 denier). The core wire may be subjected to a conventional adhesive treatment, such as an adhesive treatment by a liquid resorcin-formalin-latex (RFL liquid) for the purpose of improving the stickiness of the rubber component.
    [048] The strand twisted using a multifilament yarn (eg organsim, single twist or lang lay) can generally be used as the core wire. The average wire diameter of the core wire (twisted strand fiber diameter) may be, for example, from 0.5 to 3 mm, preferably from 0.6 to 2 mm, and more preferably from 0.7 to 1.5 mm. The core wires can be incorporated in the longitudinal direction of the belt, being arranged parallel to each other in the longitudinal direction of the belt at predetermined locations. (Inner surface rubber layer and back surface rubber layer)
    [049] The vulcanized rubber composition to form the inner surface rubber layer (inner surface layer or inner layer) and the back surface rubber layer (back surface layer) may contain a rubber component, for example, chloroprene rubber), a vulcanizing agent or a cross-linking agent (for example, a metal oxide, such as magnesium oxide and zinc oxide, or a sulfur vulcanizing agent, such as sulfur), an agent crosslinking agent or a crosslinking aid (for example a maleimide crosslinking agent such as N,N'-m-phenylene dimaleimide), a vulcanization accelerator (for example TMTD, DPTT or CBS), an enhancer (eg carbon black or silica), a softener (eg oils such as naphthenic oil), a processing agent or a processing aid (eg stearic acid, a metallic salt of stearic acid , a wax, or a paraffin a), an antidegradant, a tack-improving agent, a filler (for example clay, calcium carbonate, talc or mica), a dye, a tack agent, a plasticizer, a coupling agent (for example , a silane coupling agent), a stabilizer (eg, an ultraviolet absorber or a thermal stabilizer), a flame retardant, an antistatic agent, and the like, similar to the vulcanized rubber composition of the rubber layer adhesive. If necessary, the inner surface rubber layer and the back surface rubber layer can contain fatty acid amide and/or silica in order to improve the durability of a belt, similar to the adhesive rubber layer.
    [050] The vulcanized rubber composition to form the inner surface rubber layer and the back surface rubber layer may further contain short fibers. Examples of short fibers include the same fibers as in the core wire. A short fiber containing the synthetic fiber or the natural fiber among the above-described fibers is preferred, particularly the synthetic fiber (eg polyamide fiber or polyalkylene arylate fiber), above all at least the aramid fiber a from the point of view of having high rigidity, strength and modulus. The average length of the short fiber is, for example, from 1 to 20 mm, preferably from 2 to 15 mm, and more preferably from 3 to 10 mm, and the average fiber diameter is, for example, from 5 to 50 µm, preferably from 7 to 40 µm, and more preferably from 10 to 35 µm. The short fiber can be subjected to an adhesive treatment (or a surface treatment) similar to that of the core wire.
    [051] In the rubber composition, rubbers of the same series (eg diene rubber) or of the same type (eg chloroprene rubber) as the rubber component in the rubber composition of the adhesive rubber layer, are many sometimes used as the rubber component.
    [052] The proportions of the vulcanizing agent or the cross-linking agent, the cross-linking agent or the cross-linking aid, the vulcanizing accelerator, the enhancer, the softener, the processing agent or the aid processing, the antidegradant, fatty acid amide, and silica can be selected from the same range as in the rubber composition of the adhesive rubber layer, respectively. The short fiber ratio may be selected from a range of about 5 to 50 parts by mass per 100 parts by mass of rubber component, and may generally be from about 10 to 40 parts by mass, preferably 15 to 35 parts by mass, and more preferably from 20 to 30 parts by mass.
    [053] The thickness of the inner surface rubber layer can be suitably selected depending on the type of belt, and is, for example, from about 2 to 25 mm, preferably from 3 to 16 mm, and more preferably from 4 to 12 mm. The thickness of the back surface rubber layer can also be suitably selected depending on the type of belt, and is from about 0.8 to 10.0 mm, preferably from 1.2 to 6.5 mm, and more preferably from 1.6 to 5.2 mm. (Reinforcement fabric)
    [054] The case of using a reinforcing fabric under the transmission belt is not limited to the modality in which the reinforcing fabric is laminated on the surface of the inner surface rubber layer, and may be, for example, the modality wherein the reinforcing fabric can be laminated onto the surface of the back surface rubber layer (the opposite surface of the adhesive rubber layer), or the embodiment wherein the reinforcing layer is incorporated into the inner surface rubber layer, and /or on the back surface rubber layer (for example, the embodiment described in JP-A-2010-230146). The reinforcing fabric can be formed from, for example, a fabric material, such as a textile fabric, a high angle fabric, a knitted fabric, or a non-woven fabric (preferably a fabric), and , if necessary, can be laminated onto the surface of the inner surface rubber layer and/or the back surface rubber layer, after having been subjected to the adhesive treatment described above, such as an RFL liquid treatment (e.g. dipping treatment), friction in which the adhesive rubber layer is rubbed onto the fabric material, or the lamination (coating) of the adhesive rubber and the fabric material.
    [055] In the description, in the case where the reinforcing fabric is laminated on the surface of the inner surface rubber layer or the back surface rubber layer, the inner surface rubber layer or the back surface rubber layer is defined as the state including the reinforcing fabric (i.e. the laminate of the inner surface rubber layer or the back surface rubber layer and the reinforcing fabric). [Transmission belt production method]
    [056] The production method of the transmission belt of the present invention is not particularly limited, and the conventional method can be used for one step of lamination of each layer (method of producing a bushing of the belt).
    [057] For example, in the case of a toothed V-belt, a laminate of the reinforcing fabric (bottom fabric) and the inner surface rubber layer sheet (unvulcanized rubber) are arranged in a flat mold with teeth. wheel, wherein the toothed portions and the groove portions are alternatively provided in the state of the reinforcing fabric down, and pressurized with pressing at a temperature of about 60 to 100 °C (in particular 70 to 80 °C) to prepare a toothed block having raised toothed portions (a block that is not fully vulcanized and in a semi-vulcanized state), and subsequently both ends of the toothed block can be cut vertically from the top of a portion of mountain of sprockets. A molded article can be prepared by covering a cylindrical mold with an internal die having toothed portions and slot portions alternately provided, and then winding the toothed block so as to engage with the toothed portions and slot portions. of the internal matrix, and articulating at the top of the toothed mountain portion, laminating a first sheet of the adhesive rubber layer (an inferior adhesive rubber: unvulcanized rubber) onto the winding of the toothed block, with the rotating movement of the core wire spirally over it, and sequentially winding a second adhesive rubber layer sheet (an upper adhesive rubber: same as the adhesive rubber layer sheet above), a back surface rubber layer sheet (non-rubber vulcanized) and, an additional reinforcing fabric (an upper fabric) over it. The mold is then covered with a coating, and placed in a vulcanization vessel, and the vulcanization is carried out at a temperature of about 120 to 200 °C (in particular 150 to 180 °C) for the preparation of a strap bushing. The belt bushing can then be cut into a V-shape using a cutter or the like. EXAMPLES
    [058] The present invention is described below in more detail based on examples, but it should be understood that the invention is not limited by these examples. In the following examples, the measurement method and the valuation method on each property, and the raw materials used in the examples are described below. Unless otherwise noted, all parts and % are on a mass basis. [Properties of vulcanized rubber composition] (1) Hardness, tensile test and tear test
    [059] Unvulcanized adhesive rubber layer sheets and inner surface adhesive rubber layer sheets (back surface adhesive rubber layer sheets) shown in Tables 1 and 2 were vulcanized with pressing (pressure: 2.0 MPa) at a temperature of 160 °C for a period of 20 minutes to prepare vulcanized rubber sheets (length: 100 mm, width: 100 mm, thickness 2 mm). (Toughness)
    [060] According to JIS K6253 (2012), a laminate obtained by vulcanized three-stack rubber sheets was used as a sample, and its hardness was measured by using a hardness tester type A durometer. (Traction test)
    [061] The tensile test was conducted in accordance with JIS K6251 (2010). The vulcanized rubber sheet was perforated in a dumbbell shape as a sample. The specimen was pulled with a tensile test, and tension (tension at 100% elongation) at the time the specimen was stretched 100%, and force (strength at break) and elongation (elongation at break) at the time of break were measured. With respect to the rubber sheet adhesive layer, a tensile test was conducted such that a tensile direction in one bearing direction of the rubber sheet, and 100% of the elongation stress, strength at break and elongation at break were measured. In relation to the inner surface rubber layer sheet (back surface rubber layer sheet), a tensile test was conducted using a sample, in which the short fibers are oriented parallel to a tensile direction and a sample in which the short fibers are oriented vertically. With respect to the parallel direction, the force at break was measured, and with respect to the vertical direction, 100% of the elongation stress, force at break and elongation at break were measured. (Tear test)
    [062] The tear test was conducted with JIS K6252 (2007). The vulcanized rubber sheet was perforated in an angle shape, the angle shape was pulled with a tensile tester, and tear strength was measured. With respect to the adhesive rubber layer sheet, a tear direction was a direction parallel to a rolling direction of the rubber sheet. With respect to the inner surface rubber layer sheet (back surface rubber layer sheet), the orientation of the short fibers was a direction vertical to the tensile direction, that is, a direction parallel to the tear direction. (2) Take-off force
    [063] A plurality of core wires were arranged in parallel on a surface of the unvulcanized adhesive rubber layer sheets (four types of Example 3, Example 5, Comparative Example 1 and Comparative Example 2) with a thickness of 4 mm, as shown in Table 1, so one width is 25 mm, and one screen has been laminated onto the other surface. The resulting laminate (core wire, adhesive rubber layer sheet and screen) were vulcanized with pressing (temperature: 160 °C, time: 20 minutes and pressure: 2.0 MPa) to prepare a strip sample for the peel test (width: 25 mm, length: 150 mm, and thickness 4 mm). According to JIS K6256 (2006), a peel test was conducted at a tensile rate of 50 mm/min, and the peel force (adhesive vulcanizing force) between the core wire and the adhesive rubber layer sheet was measured in an atmosphere of room temperature. [Belt Properties]
    [064] As shown in FIG. 2, the displacement durability test was conducted by using an axial double displacement testing machine consisting of a drive pulley (Dr.) 12 having a diameter of 50 mm and a driven pulley (Dn.) 13 having a diameter of 125 mm. Then, a raw edge toothed V-belt 11 was hung on each of pulleys 12 and 13, a load of 10 Nm (displacement durability test 1: intermediate load durability) or 15 Nm (travel durability test 2 displacement: high load durability) was applied to the driven pulley 13, where the rotation number of the driving pulley 12 is 5,000 rpm, and the belt was moved for a maximum of 60 hours at an ambient temperature of 80 °C. When the belt could be moved for 60 hours, it was considered that there is no problem in terms of durability. In relation to the belt that was not moved for 60 hours and flaking (separation) was generated at the interface between the adhesive rubber layer and the inner surface rubber layer, the moment when flaking (flaking at a depth of about 1 mm from the end of the belt) occurred was confirmed. [Raw material]
    [065] Fatty acid amide: Stearic acid amide (structural formula: C18H37NO), "AMIDA AP-1", manufactured by Nippon Kasei Chemical Co., Ltd., melting point: 101 °C
    [066] Fatty acid bis-amide: ethylene bisoleic acid amide (structural formula: C38H72N2O2, “SPLICAKS O” manufactured by Nippon Kasei Chemical Co., Ltd.,
    [067] Fatty Acid Ester Amide: Ethanolamine distearate, "SLIAID S", manufactured by Nippon Kasei Chemical Co., Ltd.,
    [068] Naphthenic oil: "RS700" manufactured by DIC Corporation
    [069] Silica A: “ULTRASIL VN-3” manufactured by Evonik Degussa Japan, specific surface area: 155 to 195 m2/g
    [070] Silica B: "NIPSIL ER", manufactured by Tosoh Silica Corporation, specific surface area: 70 to 120 m2/g
    [071] Silica C: "NIPSIL KQ", manufactured by Tosoh Silica Corporation, specific surface area: 215 to 265 m2/g
    [072] Carbon Black: "SEAST 3" manufactured by Tokai Carbon Co., Ltd.
    [073] Resorcin-formalin copolymer (resorcinol resin): resorcin-formalin copolymer having less than 20% resorcinol and less than 0.1% formalin
    [074] Antidegradant: "NONFLEX OD3", manufactured by Seiko Chemical Co., Ltd.
    [075] TMTM Vulcanization Accelerator: tetramethylthiuram monosulfide
    [076] Aramid short fiber: "CORNEX short fiber", manufactured by Teijin Techno Products Limited, short fibers having an average fiber length of 3 mm and an average fiber diameter of 14 µm, having undergone an adhesive treatment with an RFL liquid (resorcin: 2.6 parts, 37% formalin: 1.4 parts, vinylpyridine-styrene-butadiene copolymer latex (manufactured by Zeon Corporation): 17.2 parts, 78.8 parts water) , and having a solids content adhesion ratio of 6% by mass.
    [077] Core wire: Fiber obtained by submitting a twisted strand having a total denier of 6,000, obtained by twisting 1000 denier PET fibers in the 2x3 twist structure with a second twist coefficient of 3.0, and a first torsional coefficient of 3.0 for an adhesive treatment. Examples 1 to 5 and Comparative Examples 1 and 2 (Formation of rubber layer)
    [078] The rubber compositions indicated in Tables 1 and 2 (adhesive rubber layer) and Table 3 (inner surface rubber layer and back surface rubber layer) were kneaded using a conventional method such as a Banbury mixer , respectively, and the crumpled rubbers were passed through calender rollers to prepare laminated rubber sheets (adhesive rubber layer sheet, inner surface rubber layer sheet, and back surface rubber layer sheet).
    [079] In Table 3, the inner surface rubber layer material and the back surface rubber layer material have the same rubber composition, Rubber 1 is for intermediate loading use, and Rubber 2 is for the use at high load. With regard to the composition, Rubber 2 has the formulation that the amounts of aramid short fiber, carbon black and N,N'-m-phenylene dymaleimide added are made high compared to Rubber 1, thus making the hard rubber composition to increase the modulus (resistance to lateral pressure).
    [080] In Table 1, Examples 4 to 8 have the formulation in which the amount of fatty acid amide was changed (2, 4, 6, 8 and 10 parts), and have the same composition, except for the amide of fatty acid. Example 1 is the same as Example 4, except that the added fatty amide and stearic acid are added in an amount of 0.3 parts and 1 part, respectively. Examples 2 and 3 are the same as Example 1, except that the fatty acid amide is added in an amount of 0.5 parts or 1 part. Comparative Example 1 has the same composition as Example 4, except that stearic acid is added in an amount of 2 parts in place of the fatty acid amide. Comparative Example 2 has the same composition as Comparative Example 1, except that N,N'-m-phenylene-dimaleimide is added in an amount of 8 parts. Comparative Examples 1 and 2 are of materials corresponding to the adhesive rubber layers used on the rubber V-belt described in Patent Document 1 (JP-A-61-290255), as shown in Table 1 below.
    [081] In Table 2, Examples 9 and 10 have the same composition as Example 3, except that silica having different specific surface area is added. Comparative Examples 3 and 4 have the same composition as Comparative Example 1, except that silica having different specific surface area is added.
    [082] The evaluation results of the properties of the vulcanized rubber composition obtained in the examples and comparative examples are also presented in Tables 1 to 3. [TABLE 1]
    [TABLE 2]

    [TABLE 3]

    [083] As is evident from the results of Table 1, in Examples 4 to 6, where the ratio of the fatty acid amide was changed, the difference in hardness is not apparent, but 100% of the elongation stress, resistance to breakage and elongation at break were increased with increasing amount of fatty acid amide. This trend was confirmed in Examples 1 to 3, where stearic acid was added. On the other hand, in Examples 7 and 8, where the fatty acid amide ratio is 8 parts or more, elongation at break is improved, but stress at 100% elongation, breaking strength, tear strength and strength take-off were slightly reduced. This tendency can be assumed to be that excess fatty acid amide that does not interact with silica is increased, and this fatty acid acts as an internal lubricant (softener). Although the ratio of fatty acid amide is 0.3 parts, Example 1 showed high peel strength compared to Comparative Example 1 where the fatty acid amide is not added. Although the proportion of fatty acid amide is small, the tackiness has been improved.
    [084] In the comparison between Example 4 and Comparative Example 1, Example 4 in which the fatty acid amide was added, exhibited 100% stress at high elongation, but low breaking strength and lower elongation at break. The reason for this is to consider that the fatty acid amide interacts with silica to improve the silica dispersibility and the adhesiveness between the silica and the rubber component, and to improve the modulus (tension at 100% elongation), thus making it difficult to stretch.
    [085] In Comparative Example 2, in which N,N'-m-phenylene dymalemide was added in an amount of 8 parts by mass, it showed high hardness and stress at 100% elongation, but showed lower elongation at break, and together with it, it showed the lowest breaking strength and tear strength.
    [086] Furthermore, as is evident from the results in Table 2, in Example 10 where the specific surface area is high, stress at 100% elongation, tensile strength and tear strength were the highest values, and in Example 9 where the specific surface area is small, these properties were the smallest values. On the other hand, in relation to elongation at break and peel strength, Example 9, where the specific surface area is small, showed the highest value, and Example 10, where the specific surface area is large, showed the lowest value. From these results, the silica of Example 3, with the specific surface area that is close to the intermediate value between Example 9 and Example 10 had properties having the most excellent balance.
    [087] In the comparison between Example 9 and Comparative Example 3, and between Example 10 and Comparative Example 4, Examples 9 and 10, in which the fatty acid amide was added, showed high hardness, stress at 100% of elongation, breaking strength, tear strength and peel strength. This trend is the same trend as recognized in Example 3 in relation to Comparative Example 1. Therefore, it is noted that the interaction is present between the silica and the fatty acid amide, even as the specific surface area of the silica is changed . (belt production)
    [088] A laminate of a reinforcing fabric and an inner surface rubber layer sheet (unvulcanized rubber) was arranged in a flat mold with wheel teeth, in which the toothed portions and the groove portions are provided alternatively, in the down reinforcing fabric state, and pressurized by pressing at 75°C to prepare a serrated block having raised serrated portions (a block that is not fully vulcanized and in a semi-vulcanized state). Then the two ends of the sprocket block were cut vertically from the top of a mountain portion of the sprockets.
    [089] A molded article was prepared by covering a cylindrical mold with an internal die having toothed portions and portions of grooves alternately provided, and then winding the toothed block so as to engage with the toothed portions and the portions of grooves of the internal matrix, and articulating to the top of the serrated mountain portion, the lamination of a sheet of adhesive rubber layer (an inferior rubber adhesive: unvulcanized rubber) onto the winding of the serrated block, the rotary movement of a core wire spirally into it, and sequentially winding another adhesive rubber layer sheet (an upper adhesive rubber: same as the adhesive rubber layer sheet above), and a back surface rubber layer sheet (unvulcanized rubber) additionally on top of it. The mold was then covered with a liner, and disposed in a vulcanization vessel, and vulcanization was carried out at a temperature of 160°C for a period of 20 minutes to prepare a belt bushing. The bushing was then cut into a V-shape to a given width in a longitudinal direction of the belt by means of a cutter to mold into a belt having the structure shown in FIG. 1, that is, a rough edge toothed V-belt, which is a variable speed belt having wheel teeth on one side of the inner circumference of the belt (size: top width 22.0 mm, thickness 11.0 mm, length of outer circumference 800 mm).
    [090] The prepared low edge toothed V-belts are types 11, in which the combination of the adhesive rubber layer and the inner surface rubber layer (the back surface rubber layer has the same formulation as the rubber layer. interior surface rubber) has been changed. The results of the evaluation of the belts obtained in the examples and comparative examples are shown in Table 4. [TABLE 4]

    [091] As is evident from the results in Table 4, with respect to the displacement durability test 1 under an intermediate load, the belts using the adhesive rubber layers of Examples 2 to 6 can move for 60 hours, and the durability was excellent. On the other hand, in belts using the adhesive rubber layers of Comparative Examples 1 and 2, peeling occurred at an early stage at the interface between the adhesive rubber layer and the inner surface rubber layer.
    [092] With respect to the displacement durability test 2 under high load, the belt using the adhesive rubber layer of Example 4 could move for 60 hours, and thus the durability was excellent under high load conditions. On the other hand, in the belts using the adhesive rubber layers of Comparative Examples 1 and 2, interfacial peeling was observed at 10 hours and 40 hours, respectively. From the comparison between Comparative Example 1 and Comparative Example 2, under high load conditions, the effect of suppressing interfacial peeling is recognized by the increase in the hardness of the adhesive rubber layer, but it is found that the effect is not sufficient in strict layer and under high load condition by simply increasing the hardness of the adhesive rubber layer. Examples 11 and 12
    [093] The properties of vulcanized rubber were evaluated by changing the type of fatty acid amide. That is, the formulation of the rubber composition was the same as in Example 4, except the change of the fatty acid amide type, ie, fatty acid bis-amide was added in Example 11, and the fatty acid ester amide was added in Example 12, both in an amount of 2 parts by mass. The results of the properties of vulcanized rubbers are shown in Table 5 together with the results of Example 4 and Comparative Example 1 [TABLE 5]

    [094] As is evident from the results of Table 5, Examples 4, 11 and 12 using the fatty acid amide show high values in hardness, stress at 100% elongation, breaking strength and tear strength compared to those of Comparative Example 1 using stearic acid, and the elongation at break in Examples 4 and 11 decreased slightly.
    [095] Although the present invention has been described in detail and with reference to specific embodiments, it is evident to a person skilled in the art that various modifications or changes can be made without departing from the spirit and scope of the present invention.
    [096] This application is based on Japanese Patent Application No. 2012-100332 filed April 25, 2012, and Japanese Patent Application No. 2012-231627 filed October 19, 2012, the descriptions of which are incorporated herein by reference. INDUSTRIAL APPLICABILITY
    [097] The transmission belt of the present invention can be used as several belts in which transmission loss is required, it can also be used in a simultaneous power transmission belt, such as a toothed belt, and is preferably used as a friction drive belt. Examples of friction drive belt include a low edge belt having a V-shaped cross section, a rough edge toothed V belt having wheel teeth provided on one side of the inner circumference, or on both one side of the inner circumference and one side of the outer circumference of a rough edge belt and a V-ribbed belt. In particular, it is preferably applied to a belt (a variable speed belt) used in a transmission in which the gear transmission ratio is continuously variable during the belt's displacement. DESCRIPTION OF NUMBERS AND REFERENCE SIGNS 1 Adhesive rubber layer 2 Core wire 3 Inner surface rubber layer 4 Back surface rubber layer 5 Lining fabric 6 Toothed portion 12 Drive pulley 13 Driven pulley 11 Edge toothed V-belt gross.
    权利要求:
    Claims (6)
    [0001]
    1. A transmission belt comprising a core wire extending in the longitudinal direction of the belt, an adhesive rubber layer in contact with at least a portion of the core wire, a back surface rubber layer formed on a surface of the layer of adhesive rubber, and an inner surface rubber layer formed on the other surface of the adhesive rubber layer and engaging or contacting a pulley, characterized in that the adhesive rubber layer is formed of a vulcanized rubber composition comprising a rubber component comprising chloroprene rubber, a fatty acid amide and a silica.
    [0002]
    2. Drive belt according to claim 1, characterized in that the proportion of the fatty acid amide is 0.3 to 10 parts by mass per 100 parts by mass of the rubber component.
    [0003]
    3. Drive belt according to claim 1 or 2, characterized in that the proportion of fatty acid amide is 1 to 30 parts by mass per 100 parts by mass of silica.
    [0004]
    4. Drive belt according to any one of claims 1 to 3, characterized in that the fatty acid amide comprises a fatty acid amide having an upper saturated or unsaturated fatty acid residue having from 10 to 26 atoms of carbon, or a higher amine residue having from 10 to 26 carbon atoms.
    [0005]
    5. Transmission belt, according to any one of claims 1 to 4, characterized in that the silica has a specific surface area for nitrogen adsorption according to the BET method from 50 to 400 m2/g.
    [0006]
    6. Drive belt according to any one of claims 1 to 5, characterized in that it is a friction drive belt.
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    同族专利:
    公开号 | 公开日
    MY168039A|2018-10-11|
    CN104254709B|2016-03-16|
    EP2843258B1|2017-03-01|
    US10641355B2|2020-05-05|
    JP2013242034A|2013-12-05|
    WO2013161777A1|2013-10-31|
    IN2014DN08940A|2015-05-22|
    EP2843258A4|2015-12-30|
    CN104254709A|2014-12-31|
    US20150111677A1|2015-04-23|
    BR112014026780A2|2017-06-27|
    EP2843258A1|2015-03-04|
    JP5727442B2|2015-06-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-19| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-02-09| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-07-13| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-10| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/04/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012100332|2012-04-25|
    JP2012-100332|2012-04-25|
    JP2012231627A|JP5727442B2|2012-04-25|2012-10-19|Transmission belt|
    JP2012-231627|2012-10-19|
    PCT/JP2013/061815|WO2013161777A1|2012-04-25|2013-04-22|Transmission belt|
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