Method of producing paper

专利摘要:
In the production of paper or pulp sheets from a paper stock, a binder is added which comprises cationic and anionic components to improve the paper characteristics and the stock characteristics, such that increased retention and a more readily dewatered stock are obtained. The anionic component consists of colloidal anionic particles having at least one surface layer of aluminum silicate or aluminum-modified silicic acid, such that the surface groups of the particles contain silicium and aluminum atoms in a ratio of from 9.5:0.5 to 7.5:2.5. The cationic component consists of cationic carbohydrate having a degree of substitution of 0.01-1.0.
公开号:SU1607691A3
申请号:SU864027024
申请日:1986-02-06
公开日:1990-11-15
发明作者:Руне Андерссон Чель；Ларссон Бернт；Торессон Ханс-Олоф；Вальдемар Ларссон Бо
申请人:Ека Аб (Фирма)；
IPC主号:

专利说明:

This invention relates to the pulp and paper industry, in particular to the manufacture of paper.
The purpose of the invention is to increase the efficiency of the process;
In a papermaking process comprising incorporating into an aqueous pulp containing cellulosic fiber and optionally a filler, a binder consisting of a mixture of anionic silicon-containing colloidal; particles and cationic carbohydrate, paper web forming and drying, as anionic silicon-containing colloidal particles are used.
aluminum silicate sol or aluminum modified silica sol with an atomic ratio cream. and aluminum in the surface groups of these particles is from 9.5-0.5 to 7.5, 2.5, and as a cationic carbohydrate, a compound selected from the group consisting of starch, amylopectin and locust bean gum is used, with the degree of substitution is 0.01-0.3.
In that case, if pure aluminum silicate of aluminum is used as colloidal particles, this sol can be
. get by the known method i. poo: aluminate precipitation liquid glass
F
ABOUT
O5
with

s
3160769:
natrrsh. Such a sol includes homogeneous particles, as a result of which the ratio between silicon and aluminum atoms on the surface of these particles is 7.5: 2.5. Alternatively, a sol of aluminum-modified silicic acid can be used, i.e. solf the surface layer of the particles of which contains both silicon atoms, so: fo and. aluminum atoms. Such an aluminum-modified sol is produced by modifying the silicon surface of a silica sol with aluminate ions, which is possible because, under appropriate conditions, aluminum and silicon are capable of acquiring a coordination number of 4 or 6 for oxygen, due to which they are characterized by approximately the same atomic diameters. Since the AlCOn ion is geometrically identical to the Si (OH) ion, it is capable of embedding or replacing on the surface of silicon dioxide, thanks to which there is a saddle of aluminum silicate with a fixed negative charge. Such an aluminum modified silica sol is much more resistant to JQ against gel formation in the range of RP 4-6 values, within which sols of unmodified silicic acid are capable of rather quickly gelatinization and are less sensitive to the action of salt. Processes for the production of aluminum modified silica sols are well known.
Thus, the modification of the acidic acid oxide l means that at a high pH value (approximately 10), a given amount of sodium aluminate is reacted with colloidal silicic acid: 7th, which means that the colloidal particles form surface groups, which consist of A1-01H. At low pH values (Db), these groups have a strong anionic character. Such a strong anionic character at low pH values is not achieved in the case of i; Sol from pure unmodified silicic acid, since silicic acid is a weak acid with a pH value of about 7,
The proposed method is applicable to the manufacture of paper of all grades and types.
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printing sheets, including newsprint, tissue paper, cardboard, watermarked paper and bag paper, paper sheets, etc.
It is advisable to use a binder in combination with technical pulp, in particular, with sulphate and sulphite pulp, obtained from wood of both hard and soft woods, as well as using thermomechanical and wood pulp. The presence of excess amounts of lignin in the pulp degrades the efficiency of the binder, whereby such pulp requires either the use of more significant amounts of binder, or the addition of more woody masses of other types with a low lignin content to achieve the desired

result
h
Hermina pulp mass
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and cellulosic fibers are applied to technical pulp, thermomechanical pulp, and wood or wood pulp, as well as to the fibers contained therein.
The object of the invention is achieved by the interaction or association of the agglomerate with cellulose fibers. Preferably, the prepared paper or web contains 50% cellulose polokon, but it is possible to make paper that contains smaller amounts of cellulose fibers and has improved properties in comparison with paper made from similar masses, but without using a binding agglomerate.
The t-miral fillers used include all known g-fillers having a surface that has an at least partially anionic character. In addition, mineral / mineral fillers such as kaolin, toning, titanium dioxide, gypsum, chalk and talc can be used. The term mineral filler, in addition to these materials, is applicable to wollastonite glass fiber and also to low density mineral fillers, in particular foamed perlite. In the case of using the described binder complex, such mineral fillers are substantially retained. paper products, therefore, the strength of the paper does not decrease until the
penalties it reaches in cases; when the binder is not applied.
Typically, the mineral filler is added in the form of an aqueous slurry at concentration concentrations known for such filaments,
As a mineral filler, the paper composition may include or completely form a component of the mineral filler, a filler of low density or high natural weight. The ability to add such fillers to bulk pulps is limited by keeping the fillers on the net, dewatering the pulp on the net, and the strength of the paper being made in a wet and dry state. The problems that arise when adding such fillers can be practically eliminated by applying the binder complex according to the invention, which allows the addition of such fillers. filaments in quantities greater than usual to achieve the special properties of paper products. Thus, for example, the use of a binder complex in accordance with the invention provides for obtaining paper products of low density and, therefore, stiffness with the same specific density, while preserving the strength properties of paper products (in particular, the modulus of elasticity, damage to energy, energy absorption and pullout resistance) at the same or higher level.
The proposed binder is a combination of a cationic component and, as an anionic component, the anionic sol of colloidal aluminum silicate or the anionic colloidal sol of aluminum modified silicic acid. The optimum surface area of the anionic colloidal sol particles is 50-1000 m / g, preferably 200-1000, with the best results observed with a specific surface area of approximately 300-700.
When using colloidal aluminum-modified silicic acid in the form of sol, a sol is used, which before aluminum modification contains about 2-60 wt.% Dioxide.
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silicon, preferably about 4-30 wt.% silicon dioxide, and which is modified in such a way that half the sol particles are on the surface of the particles. surface groups with a given ratio of silicon and aluminum atoms are observed. Such a sol can be stabilized by alkali at a molar ratio of silicon dioxide and - JO :) - 300: 1, preferably 15: 1 - J00: l (M is an ion taken from a class that includes sodium, potassium, lithium and ammonium). The size of the colloidal 5 particles should be less than 20 nm, preferably the average particle size should be in the range of approximately 10-1 nm (the specific surface area of the colloidal particles of aluminum-modified silicic acid is approximately 550 m / g, corresponds to an average particle size of approximately 5 , 5 nm),
In a preferred embodiment, the use of ashes of aluminum-modified silicic acid in combination with anionic colloidal particles of silicic acid possessing a maximum active surface as well as a small size, which usually averages 4-9 nm, is envisaged.
In accordance with the invention, a cationic or amphoteric carbohydrate cationized to a degree of substitution of at least 0.01, but not more than 1.0, is used as a cationic or amphoteric component of the binding system. Best results are obtained when the carbohydrate component consists of starch, amylopectin and / or locust bean gum, which, therefore, are the preferred carbohydrates.
Carob bean gum, which can be used in the binder composition according to the invention, is an amphoteric or cationic carob bean gum. Carob bean gum is found in natural conditions in carob seeds, for example, Cyamopsis tetragonalobus. The gum molecule is a practically straight chain mannan that branches at different intervals with single galactose units on alternating mannose units, Mannose
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the links are interconnected via beta- (1-4) -glycosidic bonds. - t Galactose branches are obtained by alpha - () - bonds, Cationic derivatives are obtained by the reaction between the hydroxyl groups of the polygalactomannan and the reactive quaternary ammonium compounds In the case of carob bean gum, the acceptable degree of substitution of the cationic groups is at least 0.01, preferably 0.05, but it can reach 1.0. A suitable interval may be 0.08--0.5. The molecular weight of the locust bean gum is in the range of 100,000 - 1,000,000, usually about 220,000. When used. As a chemical for paper making, natural locust bean gum gives greater strength, reduces the level of formation and improves the conditions for the progress-forming of the paper web. However, the natural locust bean gum impedes the dehydration process, resulting in reduced productivity or an increase in the required drying time. To avoid this, chemically modified locust bean gums are used which are amphoteric or cationic.
When used as a cationic component of cationic starch, the latter is obtained from starch, which is prepared from any conventional materials, in particular from corn, wheat, potato, rice and other starch, the cationic starch is obtained by substituting ammonium groups in accordance with known technology , and the product is characterized by different degrees of substitution. According to the invention, it is preferable to use materials with a degree of substitution of 0.01-0.1 for cationic starch. The best results are obtained when the degree of substitution is in the range of about 0.01-0.05, preferably about 0.02-0.04 (above about 0.025, but below about 0.04). In spite of the wide variety of ammonium compounds in the preparation of the cationic starches envisaged for carrying out the invention,
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shadows in the binder composition, it is preferable to use quaternary compounds. A predominantly exemplified is kationized krakmal, which is prepared by treating the starting starch with 3-chloro-2-hydroxypropyl trimethyl ammonium chloride or 2,3-ethoxypropyl trimethylammonium chloride, which yields cationic starch with a degree of substitution of 0.02-0.04,
When using amylopectin as a cationic carbohydrate, prefer flax to a degree of substitution of 0.01-0.1, in which case a similar narrowed spacing and more preferable ranges are also acceptable as for cationic starch.
In paper making or paper web making, the binder is added to the paper pulp before forming the paper or paper product, respectively, on a papermaking or dewatering machine. The order and place of addition of both components depends on the type of papermaking machine that is used in the process, as well as on the mechanical force that the pulp is subjected to before feeding it to the metal screen. The components should be distributed1 1 in the paper pulp, taking into account the need for their joint availability when feeding onto the wire mesh, as well as taking into account that they must have a preliminary time for interaction with each other and with the paper pulp components.
The pH of the paper pulp in the paper making process using the binder complex in accordance with the invention is not critical, so it may be in the range of 4 to 10, However, pH values exceeding 10 and less than 4 are unacceptable. Nevertheless, in comparison with unmodified silicic acid used as an anionic component, significantly better results are obtained, especially at low pH values in this range,
Other chemicals used in papermaking can also be used, such as E sizing agents, alum, etc., however, the content of such agents should not be high enough, because otherwise they prevent the formation of agglomerate anionic aluminum-modified silicic acid. and cationic starch and / or locust bean gum, and so that the content of these additives in the recirculation of the recycled water does not become too high and does not prevent lo formation of the binder agglomerate Thus, these chemicals are typically added to the system at a stage in which the agglomerate formation has been completed,
 According to the invention, the weight ratio of the amphoteric or preferably cationic component and the anion-active colloidal component of aluminum-modified silicic acid should be in the range of 0.01: 1 to 25: 1, preferably in the range of 0.25: 1 to 12.5: 1,
The amount of binder that needs to be used varies depending on the effect achieved and the characteristics of the particular components that are chosen when preparing such a binder. For example, if the binder contains polymeric aluminum-modified silicic acid as a component consisting of colloidal aluminum-modified silicic acid, a greater amount of binder may be refined than when the component of colloidal aluminum-modified silicic acid is colloidal aluminum-modified silicic acid with a specific surface area of 300–700. Similarly, if reduced for the cationic Component is used heat of substitution may require a greater amount of binder, provided that the colloidal component of aluminum-modified silicic acid remains unchanged,
When the paper pulp does not contain a mineral filler, the amount of binder is usually in the range of 0.1 to 15% by weight, preferably 0.25 to 5% by weight, based on the weight of the cellulose fiber. The efficiency of the binder using technical pulps is superior, due to which it is necessary to use a smaller amount to achieve a given effect with such pulps.

ten
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binder than using other types of cellulose. When using a mineral filler, the amount of binder can be selected on the basis of the weight of the filler and is in the range of 0.5–25 wt.%, Usually 2.5–15 wt.%, Based on the filler,
In the embodiments of the invention, various grinding methods and properties of the finished product are recorded, and the following standards are used:
Grinding in the mass roll Wellley
The degree of grinding:
Canadian standard grinder
Schopper - Riegler
Web molding
Weight indicator
Density
Filler content
Tensile strength
Z-strength
Ash content (quick ash analysis)
swallowed
SCAN-C 25:76
SCAN-C 21:65 SCM-C 19:65 SCAN-C 26:76
SCM-P SCAN-P
6:75
7-75
SCAN-P 5:63
SCAN-P 38:80
Olvrrton Griner und Gassner GmbH, Munich
Puppy energy exponent
SCAN-P 38:80
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In the process of testing the finished paper web, it is first subjected to conditioning at 20 ° C in air at a relative humidity of 65%.
The retention tests carried out in the examples are carried out using a dynamic dewatering chamber (Britt-jar), which is equipped with a vacuum pump and a measuring flask for sampling the first 100 ml of suction water. For the measurements, a dehydration vessel equipped with a tap as well as a wire mesh (wire gauge AO mil, 1.024 mm) with a cell size of 310 microns is used. The water extraction rate is adjusted by means of glass tubes, sides of different diameters, and in the experiments this speed corresponded to 100 ml / 15 s. In this case, the following measurement method is used:
1, while stirring 500 ml of cus; 7 pensions of paper with a speed of 1000 rpm, start the countdown;
2, after 15 seconds, colloidal silicic acid and a filler are added; the total dry matter content (fiber + filler) should be 0.5%;
3. after 30 seconds add locust bean gum, amylopectin and / or cationic starch;
4, after 45 seconds, begin the suction of water;
5. The first 100 ml of water is collected and filtered through filter paper grade 00, which is pre-weighed;
6, the filter paper is dried, weighed and c; flushed before the formation of ash;
7.Calculate ability to hold.
During the experiments, technically available clay and chalk, as well as cationic starch, are used. However, these technically available means are used as a means of retention.
The SJOHl-STEN® Np chalk used in the experiments of these examples is natural, high-grade amorphous caldi carbonate. structures. Used grade C clay and Superfil clay is kaolin.
As a carob bean gum, products of the following different types are used:
Daridriv® 158 and 162 are carob bean gums of cationic types, with GENDRIV 158 gum characterized by moderate, DN {ENDRIVE® 162 high cationic activity; -.
CEL BOND 120 and SELBOND®22 are carob bean gums, SELBOND® 120 is an amphoteric carob gum with both cationic and anionic properties, SELBOND® 22 is a weakly substituted cationic cationic and anionic properties, SELBOND® is a poorly substituted cationic cationic and anionic properties; tree with added quaternary ammonium-i groups.
PERCOL® 140 is a cationic polyacrylamide, which is used as an additive that promotes retention,
P P I m p 1. Prepare a paper pulp containing 70% fully bleached pulp.
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(fully bleached birch sulphate pulp and pine sulphate pulp, pine sulphate in a ratio of 60; 40) and 30% clay C.
Technical pulp is pre-ground in a laboratory mass roll to the degree of grinding using a 200 ml Canadian standard device. The paper pulp is diluted to a dry matter content of 0.5% and 1% alum is added to it, after which the pH of the paper pulp is adjusted to 4.0-4.5 with sulfuric acid,
The retention and dewatering characteristics of the paper pulp are determined at various dosages of the chemical agent. When measuring retention capacity, a dynamic dewatering chamber (Britt-jar) is applied. The stirrer speed is 800 rpm and the mesh number is 200 mesh. The degree of retention of this fine fraction is determined with various chemical additives. Cationic starch is a potato-based product, the degree of substitution of which is 0.04.
Three different anionic components are tested:
A. Sol 15% silicic acid
with a specific surface area of 500
2. / m / g and the value of the ratio of dioxide
silicon and sodium oxides approximately 40;
B, Sol 15% aluminum-modified silicic acid with a specific surface area of 500 and a ratio of silica and sodium oxide to about 40 and a content of 9% aluminum atoms on the surface of sols, which gives a total 0.46% alumina content in terms of the dry matter content of the ashes. The Si: Al ratio is 5.05: 0.5. The ratio of carbohydrates to SiOg. is 0.25: 1,
C. Same as in p. B, but with a content of 25% of aluminum atoms on the surface of the ashes, which gives 1.2% luminium oxide in terms of the total dry matter content in the ashes. Ratio. Si: Al is 7.5: 2.5, and the ratio of carbohydrate to SiOj is 0.21: 1,
In Figures 1 and 2, the results of the analysis are presented in the form of diagrams. The dosed amount of cationic starch is compared with the added amount in terms of
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on dry matter of paper pulp. Dosing is carried out in the following order: first, cationic to starch, and then anio-reactive component. Notwithstanding FIGS. 1 and 2, it can be seen that the efficiency of the anionic component increases markedly with an increase in the aluminum content in the ash,
PRI me R 2, 0.5% paper pulp from unbleached industrial pulp (pine sulphate pulp with a permanganate number of about 53 in accordance with SCAN-C1) is prepared in the same way as described in example 1 and crushed to 23 CR, wherein the pH is adjusted to 4.5, 10% clay C is added to the pulp,
The retention of the fine mass at various dosages of chemical agents is determined similarly to an example.} By this example, by
Finnish wire mesh forming cylinder (SCAN-C2676) make laboratory paper sheets. Potato-based starch with a degree of substitution of 0.04 is used as cationic starch: In this example, two anionic components are used:
A, Sol of 15% silicic acid with a specific surface area of 500 and a ratio of silica and sodium oxide to about 40;
B, Aluminum modified 15% silica sol with a specific surface area of 500 and a silica / sodium oxide ratio of approximately 40. The aluminum content in terms of the total number of surface groups is 9%, which corresponds to 0.46% of the total dry substances in ash. The Si: Al ratio is 5.05: 0.5, and the carbohydrate to SiOj ratio is 0.22: 1.
The dosage order is similar to that described in Example 1.
The results of the analyzes are summarized in Tables 1 and 2, and in FIG. 3 these results are presented graphically.
PRI me R 3, The retention of the fine fraction is determined on a paper pulp as in Example 1-, cation is used as chemical means.
.-, e y
25 about .
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The active carob gum (GENDRIVE 162) with a degree) of substitution 0.18, The pH value of the paper pulp is adjusted to a level of about 4.5. The following are used as anionic components:
A, Sol of 15% silicic acid with a specific surface area of 500 and a ratio of silica and sodium oxide to about 40;
B, Sol with aluminum-modified 15% silicic acid with a specific surface area of 500 and a silica / sodium oxide ratio of approximately 40. Sol contains 25% of aluminum atoms based on the total number of surface groups (silicon + aluminum), which corresponds to 1, 2% alumina in terms of the total amount of dry matter evil. The ratio of Si: Al is 7.5: 2.5, and the ratio of carbohydrates to SiOg is 0.3: 1,
C, Sol of pure silicate a.pummini, obtained by precipitation of liquid glass with sodium aluminate. Under laboratory conditions, colloids with particle sizes of approximately 200 L can be prepared (approximately specific surface area 200 m / g). Chemical composition: 88.0% silica; 7.5% alumina and 4.4% sodium oxide. The dry matter content in the product is 15.9%, the ratio of Si: Al is 4.2: 0.5, and the ratio of carbohydrates to 510 is 0.5: 1,
The results of this analysis are summarized in table 3.
From Table 3 it can be seen that with an increase in the aluminum content in the anionic component, the effect of TtffiHOCTb increases noticeably.
PRI me R 4. Prepare the pulp after; This composition: 19.7 g / l of thermomechanical mass, crushed to 70 ml of CSF (according to the Canadian standard device). The fiber suspension is diluted to 3 g / l by adding water from a magazine paper machine. By adding sulfuric acid, the RP of the paper pulp is adjusted to 5.8-6.0,
Characteristics of dewatering of pulp are determined at various dosages of chemical agents, after which the additives in accordance with the Invention are compared with technically up to 35
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with a known degradation agent, namely with the ORTANOPOL-ORGANSSORB® system. This chemical system consists of bentonite clay and anionic high molecular weight polyacrylamide. Such chemicals are dosed in quantities that are commonly used when using chemicals in a paper machine. This system is compared with the system in accordance with the present invention, which consists of a cationic locust bean gum with a degree of substitution O., 28 (MESHROYD® 9801) and an L5% aluminum-substituted silica with a specific surface area of 500 and a value of The ratio of silica and sodium oxide is approximately 40, and on the surface of the sol there are 9% aluminum atoms (of the total amount of silicon and aluminum), which gives 0.46% of alumina of the total dry matter content in the ashes. The ratio Si: Al is 0.5.
The results of the analysis are summarized in table 4.
The dosage of chemicals is produced in terms of the added quantity per ton of dry paper pulp. From the results of tabLv4, it is evident that the chemical system in accordance with the invention has a significant positive effect on the dewatering performance.
masses.
PRI me R 5, This example is given to show that a modified silica sol (especially at low pH values) has an increased efficiency. effects on cationic starch in comparison with sol unmodified silicic acid. Reactivity can be considered as a measure of the effect5 achieved in the paper pulp and in the finished paper.
The test is carried out as follows.
Cationic starch with a degree of substitution of Os028 is dissolved in water to obtain a 055% aqueous solution. To 100 g of this solution an anionic active component is added. As anionic components, the following is used as the anionic component;
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A, Sol 15% silicic acid with a specific surface area of 500 and a ratio between silica and sodium oxide: approximately
B, Sol of 15% aluminum-modified silicic acid with a specific surface area of 500, a ratio of silica and sodium oxide to about 40 and a content of 5% aluminum based on the total number of surface groups (silicon + aluminum), which corresponds to 0.25 % alumina in terms of the total amount of dry matter evils. The ratio Si: Al is 9.5: -0.5,
and the ratio of carbohydrates to SiO. - 0.36: 1,
After adding the anionic component, the solution is thoroughly mixed with a high-speed mixer (Turbo-Mix). Next, this solution is placed in a centrifugation tube and after 10 minutes of treatment at a speed of 3500 rpm, the solid phase (anion-active complex / starch). After centrifuging, pipette 1 ml of the upper layer. The sample is analyzed for the determination of dissolved starch (unreacted starch). Thus, the fraction of reacted starch can be deciphered based on the total amount of starch added, which is also a measure of the reactivity of the anionic component in relation to cationic starch. la
The test results are shown in table.5. .
The number of components A and B is pajKeHo in mass percent of the mass of the anionic component in the sample.
The test results show that the NTO of the modified alumina-F1Ni silica sol has an enhanced reactivity with respect to cationic starch in comparison with the unmodified silicic acid sol, which is especially noticeable at a lower pH value,
EXAMPLE 6 Production of cardboard for folding boxes on a large paper-making machine with interfacing units. Cardboard of this ... ,, grade consists of 5 layers, of which the first layer is made of 90% completely
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bleached sulphate pulp and 10% filler (talc), layers two through four are made from 80% compacted wood pulp and 20% recycled paper scrap, and the fifth layer is made exclusively from semi-bleached sulphate pulp.
During the tests, chemical systems of three different types are compared.
p: A
1, POLNMIN SK, technical dewatering agent;
2, Cationic potato starch with a degree of substitution of 0, OL and colloidal silicic acid with a specific surface area of 500 M Vr;
3, Cationic potato starch with a degree of substitution of 0.04 and colloidal aluminum-substituted silicic acid with a specific surface area of 500 and a ratio of Si: Al 6: 0.5 (surface groups).
The chemical agents are metered as follows: 200 g / t of the POLIOL1® 5K product after passing the sieves under pressure by three central layers (case 1). In case 2, 6 kg of cationic starch / ton and 5 kg of colloidal silicic acid / ton are also added to the chamber of the chamber after the sieve under pressure. In case 1, chemical agents are metered at the same stage as in case 2. Since they are different,. chemical systems have different effects (1) of dewatering on the mine, speed and performance
are guided so that the consumption of water vapor is maintained at the maximum level, i.e. performance is a measure of the effectiveness of various chemical systems
The results of the analysis in the form of a dia- gram are presented in Fig. 4. The sol of silica-modified silicic acid has a stronger effect than the sol of unmodified silicic acid, and an even more significant effect than the technically available product, especially at high specific gravities of cardboard.
Example. In this example, the carbohydrate is used in the form of amylopectin, a degree of cationization of approximately 0.035 and a nitrogen content of approximately 0.31%. This carbohydrate
about 5
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used in conjunction with an aluminum silicic acid sol with a specific surface area of approximately 500, a ratio of silicon dioxide and sodium oxide of approximately 40; 1 and a content of 9% aluminum calculated on the total number of surface groups. The ratio of Si: A1 is 5.05: 0.5, and that of carbohydrates to SiOj is 0.1: 1. As a paper pulp, paper pulp is prepared, containing 76% of fibers and 24% of filler (clay C ). The fiber fraction of paper pulp consists of 22% of technical pine sulphate pulp, 15% of thermomechanical pulp, 35% of pulp and 28% of recycled paper scrap withdrawn from the same paper-making machine. Paper pulp is taken from the machine for the production of magazine paper and diluted with recycled water discharged from the same machine to a concentration of 3 g / l, which is acceptable for testing. dehydration. The pH value of the boom mass by the addition of an aqueous solution of sodium hydroxide was adjusted to 5.5. The dewatering capacity of paper pulp (measured as the degree of grinding by the Canadian standard instrument) is determined with individual doses of amylopectin alone or together with an aluminum-modified silica sol. The chemicals are metered into 1 liter of paper pulp, the concentration of which is 3 g / l, with stirring at a rotation speed of 800 rpm. Amylopectin is added primarily with stirring, after which stirring is continued for 30 seconds. The sol is then added with stirring, after which stirring is continued for another 15 seconds. Conduct dehydration. Next, the pulp is stirred for 45 seconds. Amylopectin is then added and dehydrated.
From the data of Table 6 and Figure 5, it is clear that amylopectin itself has a slight dehydrating effect and that the combination of ashes of aluminum-modified silicic acid and amylopectin gives a much stronger dehydration effect. At best, the value of the degree of grinding for a Canadian standard instrument doubles with 2% amylopectin and 0.3% ashes.
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Prize, Investigate effects on dewatering .. The ability to dewater paper pulp using different binders is determined as the degree of grinding in the Canadian standard instrument. The used binders are added to 0.3% by weight of 60% bleached sulphate birch pulp and 40% bleached sulphate pine pulp. The water that is collected in the gauge is a measure of the dewatering effect. The results are given in ml-degree grinding according to the Canadian standard. Researched; anionic acids of silicic acid, denoted by the letters A and B in Example 1. The cationic component is cationic starch with a dosage of 10 kg / ton.
The results at different pH and different dosages of A and B are given in Table 7.
From Table 7 it follows that dehydration is significantly improved with the sols of aluminum-modified silicic acid according to the invention.
Example9. In this example, the effect of dehydration is analyzed. Drying of the feedstock is determined in accordance with the SCAN-C 2 1:65 procedure on jCanad, using a Grinding Tester. Chemical agents are added in 0.3% of the raw material of the standard composition comprising 60% bleached birch sulphate pulp and 40% bleached pine sulphate pulp and containing 30% calcium carbonate. The water collected in the meter is a measure of the non-volatile effect, and the results are given in ml of the grinding degree according to the Canadian standard. The anionic silicic acid sol used was the same as in Example 1 (indicated by the letter B). The cationic starch was starch, having a degree of substitution of about 0.01, which is produced under the name Kato 302. The tests are carried out with a mass having a pH of 7.
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.

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The test results are shown in Table 8.
Formula FROM Gain

权利要求:
Claims (6)
[1]
I. A method of making paper, comprising incorporating into an aqueous pulp containing cellulosic fiber. And possibly a filler, a binder consisting of a mixture of anion-active silicon-containing colloidal particles and a cationic carbohydrate, forming a paper web and drying the fact that, in order to increase the efficiency of the process, as the anionic silicon-containing colloidal particles use the comfort of a sol of aluminum silicate or a sol of silica modified with aluminum with a ratio of silicon atoms and Yuminov in the surface groups of the particles from 9,5-0,5 to 7,5-2,5, and as the cationic carbohydrate is a compound selected from the group consisting of starch, amilopek- ting and locust bean gum with. the degree of substitution is 0.01-0.3.
[2]
2. A method according to claim 1, characterized in that the binder is introduced into the pulp in an amount of 0.2-0.5% by weight with a ratio of carbohydrate and silica O, -10 :.
[3]
3. A method according to claims 1 and 2, characterized in that the sol of aluminum silicate or aluminum-modified silicic acid has a specific surface of particles 500,
[4]
4. The method according to PP, 1-3, about tl and is due to the use of paper pulp with a pH of 4-7.
[5]
5. Method pop.1, differing with the fact that the paper pulp contains 70-90 wt.% Cellulose fiber.
[6]
6. A method of pop, 1, which differs from the fact that the sol of aluminum silicate or aluminum-modified silicon silicon 1: shots are mixed with the filler before being introduced into the pulp, and after introducing this mixture into the pulp .
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Table I
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ABOUT
ABOUT
ABOUT
ABOUT
0.3
0.3
0.3
0.3
0.3
ABOUT
oh oh oh
Paper web weight, g / m Filler content,% Strength under stretching, Nm / g Resistance
To mine,
 n / m
Resistance to pulling out the coating layer
 (according to Dennison) Modulus of elasticity
20.5 30.5 38.0 30.0 31.0 46.5 44.5 30.0 20.0 30.0 56.0 59.5 38.0 20.0
Ta blitz2
115, 11.6
58 56
P 2.7
111 10.6
68 58
14 3.0
Table3
Chemicals
Without the addition of chemicals
5% ORGANOSORB + 0.05% ORGANOPOL®
0.4% carob gum.
0.4% carob gum + 0.3% angry aluminum-modified silicic acid
Table5 The amount of reacted starch in% of the total amount of starch
Table4
The degree of grinding on the Canadian standard device CSF (ml)
Spreadsheets
a 6
Cationic starch, kg / t
10 10 15 15
Udbrtnie, / o
thirty
20
YU
0.5W7.5, 2.0
Fts 7 KomuOHOQiffnudHbiu starch,%
Tables
Sol B, kg / t
Degree of Profit (CSF), md
305 395 300 405
0.dJoC
Degree of tnai
t
SOO
 5Yu
yo
AO6S ijO 15 2ff. 5 VM.2 shpinoooktLnyZ l
LS
Deterioration
60
thirty
X
Jo jff w
ftfg 3 Kupdjagu Ashy KfutnCk
NPP
LgPunoag 1plny tppment
5 l
ЛШ0Ю)
OJ% 8
m / wc
I {odifiiirobanna AS tichrstbo and I Silica Kuc / tofna
 I Nepods / fitsirodanna molichItIo 15kg / t ° I / {oawAWfe ;; nuc / iofna
 Polict SKoAsshessh, 2 kg / g
pH of mass 6.0
ABOUT
F (M 00 mind2i, 9 / p W
Ovzenyuny MSh
too
And UL
2,
T. T.
W
.0
0,
X -.--- p --- Ch5 ... ".
Editor A.Lezhnina
b ft ZE W f.25 tjo G, 15 10 i25 ISO
 §. iKMfV muH,%
Compiled by O. Maslachenko
Tehred L. Serdyukova Proofreader A. Osaulenko
Order 3556
Circulation 330
VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5
0,
X -.--- p --- Ch5 ... ".
Subscription

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同族专利:

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公开号 | 公开日

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NZ212332A|1988-11-29|

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BR8506769A|1986-09-23|

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CA1250703A|1989-03-07|

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ZA854263B|1986-01-29|

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NO165449B|1990-11-05|

---

ES8703954A1|1987-03-01|

---

AU4498585A|1986-01-10|

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DE185068T1|1986-11-06|

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EP0185068B1|1989-09-27|

---

US4961825A|1990-10-09|

---

NO165449C|1991-02-13|

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ES543934A0|1987-03-01|

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SE8403062D0|1984-06-07|

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AU573360B2|1988-06-02|

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WO1986000100A1|1986-01-03|

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FI860548A0|1986-02-06|

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DE3573282D1|1989-11-02|

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FI76392B|1988-06-30|

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NO860422L|1986-02-06|

---

JPH0219238B2|1990-05-01|

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AT46733T|1989-10-15|

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JPS61502338A|1986-10-16|

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EP0185068A1|1986-06-25|

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FI76392C|1988-10-10|

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SE8403062L|1985-12-08|

---

FI860548A|1986-02-06|

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法律状态:

优先权:

---

申请号 | 申请日 | 专利标题

---

SE8403062A|SE8403062L|1984-06-07|1984-06-07|PAPER MANUFACTURING PROCEDURES|

---

PCT/SE1985/000235|WO1986000100A1|1984-06-07|1985-06-06|Papermaking process|

---