• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU764604A3
    申请号:SU772464051
    申请日:1977-03-28
    公开日:1980-09-15
    发明作者:Фюлькони Тьерри；Женгленжер Бернар
    申请人:Понт-А-Муссон С.А. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the processing of thermoplastics, in particular, to methods for the continuous production of articles from high density network polyethylene. Techniques are known for the continuous processing of polymers with the formation of cross-links in synthetic ma-. When the material being processed is first molded at a temperature that does not yet allow crosslinking, then the material is heated to the decomposition temperature of the crosslinking agent l. Also known is the method of molding and subsequent cross-linking by passing the material through the molding zone, and then through the cross-linking zone behind it, the temperature of which is maintained at least 140 ° C. The reticulation, through which two adjacent polymer chains are connected to directly under the action of irradiation or under the action of activated carbon, is a well-known operation used for polyolefins, vinyl polymers and some elastomers, such as ethylene-propylene elastomers. Its specific use for polyolefins, such as low density polyethylene and for ethylene-propylene elastomers, is not difficult if activated carbon is released from organic peroxide. Indeed, in this case, it is easy to isolate the phase or transform the network phase, or to vulcanize the ethylene propylene elastomers. In this case, the temperatures required for processing are lower than those required to cause decomposition of organic peroxides, such as dicumyl peroxide, 2,5-dimethyl-2,5-di- (tert-butyl) -hexane peroxide, peroxide 2, 5-dimethyl-2,5-di - (tert-butyl) -hexane-3. Because of this, there is a temperature range sufficient to allow for the processing of plastic material without causing peroxide decomposition. In the formed phase, the plastic substance is referred to as a mesh and it has a viscosity, ensuring its processing by the classical methods in which plastic materials are used. If you need to reticulate polyether flax with high density, it is impossible to isolate the phase being formed or reworking using classical methods, such as extrusion or injection, of a crosslinking phase. The thermoplastic koe substance is quite small in Ekost, which ensures its formation only at temperatures in the range of 170-220 C, depending on the molecular weight of high-density polyethylene. These are the temperatures above the threshold for the decomposition of peroxides (about for this low active salt). Consequently, it is not possible to obtain high density polyethylene products having a mesh structure by methods used for removing polyethylene of low density or for curing elastomers. The purpose of the invention is to prevent premature crosslinking in the case of polyethylene processing with a density of 0.950-6.970 and a molecular weight of 200000-1000000. The goal is achieved by the fact that in the EG Method of processing cross-linking polyethylene, which includes the operations of forming a product by surface sintering and subsequent crosslinking under the action of pressure and temperature, processing is carried out at temperatures of sintering and crosslinking zones, respectively 160-180 and 200-220s, pressure kg / cm and speed the feed rate is 20–50 m / h with a sintering zone length of 0.3–1 m. The method is preferably designed for reticulation of high density polyethylene, with crystal melting temperature being higher. The best results were obtained on polyethylene with a density above 0.950, having a molecular mass of at least 200,000, capable of reaching 10. This method provides continuous production of shaped articles, pipelines, in which the material is reticulated in a homogeneous manner both inside the mass and on the surface; The value of this method is that it allows a clear separation of the moldable phase and the reticulation phase of high density ethylene, which is impossible to accomplish using the classical methods of manufacturing manufactured products or labor since reticulation occurs before: during the molding process. In this method, the molding is carried out directly on the porous mixture of polyethylene and is highly dense. The product is sintered to the reticulation agent, the reticulum is not afraid of overheating, causing shear stress, which may cause premature reticulation of a part of the product, resulting in uneven extruding product, and this heterogeneity negatively affects the final properties of the product. Since reticulation is a chemical reaction, the kinetics of which is a function of temperature, it is important to obtain the product to have the same increase in temperature per unit volume of the substance, and this is what the method provides. Device In order to implement the proposed method, the reticulated filament, the sintering die and the reticulation spinner are powered on the same axis, and these spinnerets limit the continuous space in which the Pressure Means operate, and each of them contains heating means. The substance is first molded, then fed into the plant without changing the shape, the flow of the substance is not subjected to any separation. The flow is completely homogeneous, and the substance enters the installation without the formation of stagnant zones, which cause non-homogeneous and hoc recuperation. The drawing shows the extruder mesh products, a vertical section. An extruder with a vertical axis X-X consists of a horizontal frame 1, which is made integral with the base (not shown) by means of racks 2. The base 1 has a boring 3 in the center and serves as a support for the die 4 with axis X-X having a base 5 fixed on the frame by means of links 6 and bolts 7. The nozzle 4 contains a colder heater 8 located parallel to its axis, which surrounds the bore 9 of the nozzle 9, coaxial with the bore 3 of the bed 1. The upper end of the die 4 has a flange 10 through which the connection passes 6, and on its upper side the size The supply hopper 11, provided with an annular cooling device 12, for example, with a cooling water, the hole diameter of which at the base corresponds to the bore diameter 9. The hopper 11 is more accurately placed on the flange 10 by means of a metal ring On, unheated, sliding, contact surface and Idorby & ayi to reduce heat transfer. At the base 5 of the spinneret 4 and inside the bed 1 vertically, the second 5 is located 13, coaxial with the filler 4, held in place by the lower support plate 14 with a drilled hole 15 corresponding to the bore of the spinneret and fixed on the spacer bolts B. Ea bore filler 13 is supplied non-sticky
    .
    a coating 16, for example of polytetrafluoroethylene, in order to reduce friction of the substance in the process of reticulation, the inner diameter of which is equal to the diameter of the bore 9 of the nozzle 4. Thus, from the base of the feed hopper 11 to the hole 15 of the base plate 14, the straight linear cylindrical kangsh. The die 13 is also provided with annular heating means, for example, consisting of external electrical resistances 17.
    The bed 1 serves as a support on the outside of the hila 4, two cylindrical lifts 18, 19, containing pistons 20, 21, controlled by vertical rods 22, 23, on which the horizontal plate 24 is fixed by means of bolts 25, 26. The said plate 24 is mounted slidly on C x 6 and has a hole 27 in its center, around which it is vertically lengthened by a cylinder 28, in the latter there is a piston protruding from this plate 24 and directed towards the bed 1. The piston 28 contains in its base on the plate 24 cooling means 29, such like cic tools scattering water. The outer diameter of the piston 28 is of such size that it interacts from the outside with the wall of the bore 9, which is made in the die 4.
    The links 6 are supported by their upper end above the plate 24 of the base 30, on which the lift cylinder rests. 31 comprising a piston 32 connected to a rod or a vertical punch 33 located at least to the bottom of the die 13, the punch mounted slidably inside the piston 28 and having a non-adherent coating area inside the spinneret 13. The movement of the punch 33 is controlled by a tricol 30, on the one hand, and a horizontal slab, which is made in concert with it and moving on the connections x 6, on the other. The punch 33 also contains two heating elements 35, 36, for example, with circulating oil, located first 35 along the top of the filter 4, and the second 36 along the bottom of the spinneret 13.
    A reticulated mixture intended for feeding the device is made up of the TQJIT of those thermoplastic substances in which the reticulation agent is distributed in a trophic manner before being fed into the device. The power is supplied from the reservoir; the mash 37.6 is connected to the bunker 11 by the chute 38, which must ensure a homogeneous distribution of the pores in the space between the punch 33 and the spinnerers 4 and 13. Due to the cooling device 12 of the bunker, the reticulated substance was not in the bunker, could not get to the temperature that provides reticulation. The cooling zone of the substance takes a length equal to the length of the two diameters of the punch 33 to ensure accurate flow of the powder between the punch 33 and the spinnerets 4, 1 3.
    The principle of operation of the device described in this way is as follows.
    At the beginning of the cycle, the piston 28 and the sleep 33 are in the upper position. Under the action of the pistons 20, 21, the piston 28 is lowered, which compresses the substance, which is located in the bunker 11, which has a temperature of
    5 environment due to the presence of a cooling device12. The piston 28 continues to lower, the substance is crushed, then fed into the die plate 4. At the same time, the substance is fed to
    0 to the plunger 33, which is freely lowered by the movement of the substance, due to a decrease in pressure acting on the piston .32. In this case, the substance is subjected in the filler 4 to heating under the action of the heating elements 8 and 35 and the punch 33. The piston 28 reaches the lower position of its stroke, while the pressure acting on the pistons 20, 21 drops and, since the piston 28 remains - in its lower position, the punch 33 is again lifted by the piston 32. When the punch reaches its upper position, the piston 28 rises again,
    5 and a new cycle begins.
    The die 4 thus contains a sintering zone, from where the substance is pushed out by the downward movement of the piston 28 along the punch 33.
    0 in the area of the spinneret 13, where the temperature is higher, as a result of which the mixture is reticulated. The linear movement without changing the cross section eliminates the danger of the occurrence of stagnant zones.
    five
    At the exit of the spinneret 13, the pipe or profile T falls into an attachment (not shown where it cools.
    As an example, pipe extrusion and 20 mm inner diameter and outer wall thickness 2 mm and 2 ° / 25 mm diameter and 32 mm inner diameter and external diameter and 3.5 mm wall thickness were carried out under the following conditions.
    five
    The thermoplastic material is high density polyethylene with a molecular weight equal to Srr.OOO-50AOOO, for example, Phillips polyethylene (commercial name Manolen 56) with a density of
    0 0.956 and a viscosity index of 2 under a load of 20 kg / cm. At the entrance to the polyethylene, a certain amount of additives was made and evenly mixed with it with the help of high-speed5
    one or two tanks (cold and hot tanks). Additives are nepieK-organ organ dyes, anti-oxidants, anti-ultraviolet agents, lubricants, which are all known and used in the processing of plastics. Depending on the catalysis and temperatures in different zones, you can extrude a more or less netted product using, for example, the formula “atalization of 0.5% ditertiobutyl peroxide (Triigonox B trade name) containing 0.4% silicone oil as a lubricant
    In this case, the operation is performed at the rate of 30 piston strokes per 1 MIN and with a full piston course of 40 min, the extruded length is approximately 20 mm, i.e. the movement of the punch is 20-25 mm. Temperature
    Since the vanishing of the sintering zone is of the order of 140 ° C, in fact, the temperature should be a sheathed tee
    PylyLoy: polyethylene crystalline polyethylene or it must be fairly low so that a premature reticulation does not occur in the installation. This temperature of the substance is provided: by heating the die die to 140-200 ° C, preferably 160-180 ° C.
    Regulation temperature between 140 and 20 ° C. There are functions of the speed of the flow during installation and the length of the zone.
    tmekani:. . .
    lk-yy r..h, - y
    权利要求:
    Claims (2)
    [1]
    1. Ganty of France 2152851, cl. In 29 g 2/00, published. 1973.
    [2]
    2. US patent 3,928,525,
    cl. 264-174, pub. 1975 (prototype
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    同族专利:
    公开号 | 公开日
    SE7703662L|1978-01-20|
    ES457126A1|1978-03-01|
    CA1092314A|1980-12-30|
    AU501176B2|1979-06-14|
    FR2358973A1|1978-02-17|
    MX145449A|1982-02-17|
    AU2362177A|1978-09-28|
    IE45104L|1978-01-19|
    DE2712544A1|1978-01-26|
    NO772545L|1978-01-20|
    IE45104B1|1982-06-16|
    IN156058B|1985-05-04|
    JPS5311956A|1978-02-02|
    CH610813A5|1979-05-15|
    AR212359A1|1978-06-30|
    BR7702284A|1978-08-08|
    CS208152B2|1981-08-31|
    US4126661A|1978-11-21|
    DK143377A|1978-01-20|
    ATA199477A|1981-11-15|
    YU73977A|1982-08-31|
    FR2358973B1|1978-12-22|
    OA05698A|1981-05-31|
    NL7703268A|1978-01-23|
    JPS56216B2|1981-01-07|
    ZA773737B|1978-05-30|
    SE428776B|1983-07-25|
    LU77776A1|1979-03-26|
    AT367349B|1982-06-25|
    IT1073274B|1985-04-13|
    BE856902A|1978-01-18|
    DE2712544B2|1979-01-18|
    PL196978A1|1978-02-13|
    PL110663B1|1980-07-31|
    GB1576467A|1980-10-08|
    DD131004A5|1978-05-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1544704B2|1965-05-28|1970-07-16|Chemische Werke Hüls AG, 4370 Mari|Crosslinkable molding compositions made from polybutene-1|
    US3374304A|1965-08-20|1968-03-19|Richard E. Ayres|Method for injection molding|
    FR1538988A|1966-03-14|1968-09-13|Engel Thomas Paul|Improvements in devices and processes for the manufacture of polymer products, in particular polyolefins|
    US3461490A|1967-01-30|1969-08-19|Budd Co|Extruding molding compounds|
    US3928525A|1970-12-29|1975-12-23|Mitsubishi Petrochemical Co|Method for forming and vulcanizing vulcanizable materials|
    JPS5225427B2|1971-09-30|1977-07-07|
    JPS5221193B2|1971-12-17|1977-06-08|
    US3979488A|1973-12-20|1976-09-07|General Electric Company|Process of continuously blending, molding and curing heat curable polymeric compounds|
    US4001368A|1974-02-08|1977-01-04|Dai Nippon Toryo Co., Ltd.|Method for continuous extrusion molding of thermosetting resins|
    DE2420784C3|1974-04-29|1979-02-15|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Process for the production of molded articles made of polyolefins which are crosslinked by high-energy radiation|DE2836052C2|1978-08-17|1984-08-30|Ruhrchemie Ag, 4200 Oberhausen|Ram extruder for the production of plastic pipes|
    US4269953A|1979-04-02|1981-05-26|General Dynamics Corporation|Method of crosslinking aromatic thermoplastic polymers using a biphenylene terminated compound|
    NZ194367A|1979-07-24|1983-06-17|Fastbac Res|Making embossed or contoured articles from soft permeable materials|
    US4518552A|1983-11-09|1985-05-21|Mitsuboshi Belting Ltd.|Method of producing accurately sized material of ultra high molecular weight polyethylene|
    US4731199A|1983-11-09|1988-03-15|Mitsuboshi Belting Ltd.|Ultra high molecular weight concurrently sintered and cross-linked polyethylene product|
    US4737407A|1986-03-10|1988-04-12|Essex Composite Systems|Thermoset plastic pellets and method and apparatus for making such pellets|
    JPH0446606B2|1988-04-07|1992-07-30|Kawasaki Heavy Ind Ltd|
    US4853270A|1988-06-27|1989-08-01|Essex Specialty Products, Inc.|Knee blocker for automotive application|
    US6361842B1|1996-05-30|2002-03-26|United States Brass Corporation|Reformed crosslinked polyethylene articles|
    US6814561B2|2001-10-30|2004-11-09|Scimed Life Systems, Inc.|Apparatus and method for extrusion of thin-walled tubes|
    DE10251152B4|2002-10-31|2007-10-04|Rehau Ag + Co.|Extrusion of peroxide crosslinkable plastic moldings|
    US8087923B1|2007-05-18|2012-01-03|C. R. Bard, Inc.|Extremely thin-walled ePTFE|
    CN104494104B|2014-12-12|2017-01-25|南京肯特复合材料有限公司|Vertical type extruding machine|
    CN104527026B|2014-12-12|2017-02-22|南京肯特复合材料有限公司|Vertical extruding machine|
    RU189590U1|2018-11-14|2019-05-28|Сергей Владимирович Матвеев|Manual extruder for welding plastics|
    RU196217U1|2019-09-23|2020-02-19|Сергей Владимирович Матвеев|The mechanism of drawing the welding rod in manual extruders for welding plastics|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7621933A|FR2358973B1|1976-07-19|1976-07-19|
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