Method of applying polymers functioning as aldehyde to improve drying in papermaking machines

FIELD: textile; paper.

SUBSTANCE: method consists of adding to the paper sheets approximately 0.05 pounds/ton to 15 pounds/ton, in accordance with the dry fibers, one or several polymers, functioning as aldehyde, containing amino or amido group, where, at least, 15 molar percent amino or amido group function with one or several aldehydes and where the functionaling aldehyde polymers have a molecular weight of not less than approximately 100000.

EFFECT: increased activity for drying due to a reduction in the amount of polymer.

14 cl, 5 ex

 

The technical field

Describes how to improve the dewatering of the paper machines using polymers, functionalized aldehyde with a certain level of functionality.

Background of the invention

Paper production involves the capture of the pulp raw material for paper production with consistency (weight fraction of the solid phase) in the range from 0.1 to 1.0 weight percent and the removal of her water, to form a sheet with a final consistency of about 95 weight percent. Paper machines produce this dehydration through a series of different processes, which include, in order: 1) gravitational or inertial dehydration (front forming part of the machine); 2) vacuum dehydration (rear forming part of the machine); 3) press dehydration (forming part of the machine); and 4) thermal evaporation of water (drying part of the machine). The cost of dehydration increases when moving from 1 to 4, which makes advantageous removal of more water in the earlier stages. The production speed of the paper or, equivalently, the speed of work machine is determined by the speed with which it can be removed by water and, therefore, any chemical treatment, which can increase the rate of removal of water is important for the paper manufacturer. Many varieties boom the guy requires for its production the use of additional chemical reagents to hold, to keep particulate matter present in raw materials used for the manufacture of paper. In the paper industry it is well known that these retention AIDS can also increase the speed of gravitational, inertial and vacuum dehydration, or, as it is often called, drainage. Such restraint chemical reagents include the well-known flocculants, coagulants and microparticles used in the industry. Existing laboratory tests on vacuum and free drainage can easily identify the drainage effect of these holding chemicals.

The performance of the vast majority of paper machines is limited by the drying capacity of the dryer section of the machine. Therefore, the consistency of the paper, leaving the press section and going to the dryer section, is often crucial to determine the speed or performance of the paper machine. Effect of chemical additives on press dehydration is unclear, since the information on the subject a little. About the restraining influence of chemicals on press dehydration is often reported as a harmful because of the reduced consistency at the entrance to the press as a result of increased water retention or reduce the effectiveness of the press due to losses on the Lieve sheet. Both these factors are a result of flocculation of the particles for the production of paper by holding chemicals. Since the consistency of the sheet, leaving the press section, the most frequently is the most important factor in determining the speed of the machine, it is obvious that any treatment that can improve the consistency, it would be highly desirable. Currently on the market is unknown methods of chemical treatment as commodity aid to press dehydration, although occasional reports suggested that some polymers can positively influence the consistency after pressing. Therefore, continues to exist a need to develop compositions having an effective impact on press dehydration.

Pixillion polyvinylidine derived from glyoxal and polyvinylidine at a molar ratio of from 0.1 to 0.2, as described in U.S. patent 3556932 as resin, durable in wet conditions.

Low-molecular pixillion cationic polyacrylamides, derived from glyoxal and cationic polyvinylidine at the ratio of 0.1-0.5:1, described in U.S. patent 4605702 as resin, temporarily durable when wet.

The method of imparting strength to the paper by adding to the slurry a mixture of resins containing aminopolyamide-epichlorhydrine resin and pixillion acrylic is-dimethyldiallylammonium resin, derived from glyoxal and a copolymer of acrylamide with dimethyldiallylammonium at a molar ratio of about 2-0,5:1, is described in U.S. patent 5674362.

The essence of the invention

This invention is a method for improving the dewatering of a paper sheet on a paper machine, comprising adding to the paper sheet of about 0.05 lb/ton to about 15 lb/ton, based on dry fiber, of one or more polymers, functionalized aldehyde containing amino or aminogroup, and at least about 15 mole percent of the amino - or aminogroup functionalized by reaction with one or more aldehydes, and polymers, functionalized aldehyde, have srednevekovoi molecular weight of at least about 100,000 g/mol.

Detailed description of the invention

"Acrylamide monomer" means a monomer of the formula

in which R1means H or C1-C4alkyl, and R2means H, C1-C4-alkyl, aryl or arylalkyl. Preferred acrylamide monomers are acrylamide and methacrylamide. Acrylamide is preferred.

"Aldehyde" means a compound containing one or more aldehyde (-CHO) groups, in which the aldehyde group capable of reacting with amino - or aminopropane is alimera, containing amino or aminogroup described here. Typical aldehydes include formaldehyde, paraformaldehyde, glutaraldehyde, glyoxal and the like. Preferred glyoxal.

"Alkyl" means a monovalent group produced from a saturated hydrocarbon with a linear or branched chain by removing one hydrogen atom. Typical alkyl groups include methyl, ethyl, n - and isopropyl, cetyl and the like.

"Alkylene" means a divalent group, produced from a saturated hydrocarbon with a linear or branched chain by removing two hydrogen atoms. Typical alkylene groups include methylene, ethylene, propylene and the like.

"Aminogroup" means a group of the formula-C(O)NHY1where Y1selected from H, alkyl, aryl and arylalkyl.

"Amino group" means a group of the formula-NHY2where Y2selected from H, alkyl, aryl and arylalkyl.

"Amphoteric" means a polymer obtained from both cationic and anionic monomers and, possibly, other non-ionic monomers. Typical amphoteric polymers include copolymers composed of acrylic acid and DMAEA-MCQ, ternary copolymers composed of acrylic acid, DADMAC and acrylamide, and the like.

"Aryl" means an aromatic monocyclic or polycyclic system containing from about 6 to when is Erno 10 carbon atoms. The aryl may be optional substituted by one or more groups C1-C20alkyl, alkoxy or halogenated. Typical aryl groups include phenyl or naphthyl or substituted phenyl or substituted naphthyl.

"Arylalkyl" means arylalkylamine group, where the aryl and alkylene defined above. Typical arylalkyl groups include benzyl, phenylethyl, phenylpropyl, 1-naphthylmethyl and the like. The preferred benzyl.

"Diallyl-N,N-disubstituted ammoniagenesis monomer" means a monomer of the formula

(H2C=CHCH2)2N+R3R4X-

in which R3and R4independently mean C1-C20alkyl, aryl or arylalkyl, and X is an anionic counterion. Typical anionic counterions include halogen, sulfate, nitrate, phosphate and the like. Preferred anionic counterion is a halogen. The preferred halogen. Preferred diallyl-N,N-disubstituted ammoniagenesis monomer is diallyldimethylammoniumchloride.

"Halogen" means fluorine, chlorine, bromine or iodine.

"Monomer" means a polymerized allyl, vinyl or acrylic compound. The monomer may be anionic, cationic, nonionic or zwitter-ion. Preferred vinyl monomers, more preferred acrylic monomers.

Typical neion the e water-soluble monomers include acrylamide, methacrylamide,N,N-dimethylacrylamide,Ndiethylacrylamide,Nizopropilakrilamid,Nvinylformamide,Nvinylethylene,Nvinyl pyrrolidone, hydroxyethylmethacrylate, hydroxyethylacrylate, hydroxypropylmethacrylate, hydroxypropylmethacrylate,N-tert-butylacrylamide,Nmethylolacrylamide, vinyl acetate, vinyl alcohol and the like.

Typical anionic monomers include acrylic acid and its salts, including, without limitation specified hereinafter, sodium acrylate and ammonium acrylate, methacrylic acid and its salts, including but not limited to, sodium methacrylate and methacrylate ammonium, 2-acrylamide-2-methylpropanesulfonic acid (AMPS), the sodium salt of AMPS, vinylsulfonate sodium styrene sulfonate, maleic acid and its salts, including but not limited to, sodium salt and ammonium salt, sulfonate, itaconic, sulfopropyl or methacrylate or other water-soluble forms of these or other polymerized carboxylic or sulfonic acids, as well as sulfometuron acrylamide, arylsulfonate, vinylsulfonate sodium, taconova acid, acrylamidophenylboronic acid, fumaric acid, vinylphosphonic acid, vinylsulfonic acid, allylphosphonate acid, sulfometuron acrylamide, phosphonomethylglycine acrylamide, itacademy anhydride, and things under the service.

Typical cationic monomers include allylamine, vinylamine, dialkylaminoalkyl and-methacrylates and their Quaternary or acid salts, including, but not limited to, Quaternary salt of dimethylaminoethylacrylate and methyl chloride (DMAEA-MCQ), Quaternary salt of dimethylaminoethylacrylate and methyl sulfate, Quaternary salt of dimethylaminoethylacrylate and benzylchloride, salt of sulfuric acid and dimethylaminoethylacrylate, salt of hydrochloric acid and dimethylaminoethylacrylate, Quaternary salt of dimethylaminoethylmethacrylate and methyl chloride, Quaternary salt of dimethylaminoethylmethacrylate and methyl sulfate, Quaternary salt of dimethylaminoethylmethacrylate and benzylchloride, salt of sulfuric acid and dimethylaminoethylmethacrylate, salt of hydrochloric acid and dimethylaminoethylmethacrylate, dialkylaminoalkyl or methacrylamides and their Quaternary or acid salts such as acrylamidophenylboronic, Quaternary salt of dimethylaminopropylamine and methyl sulfate, salt of sulfuric acid and dimethylaminopropylamine, salt of hydrochloric acid and dimethylaminopropylamine, metallicametallicametall, Quaternary salt of dimethylaminoethylmethacrylate and methyl sulfate, salt of sulfuric acid and dimethylaminoethylmethacrylate, salt of hydrochloric acid and dimethylaminoethylmethacrylate, IER is eliminationist, diethylaminoethylmethacrylate, diallyldimethylammoniumchloride and diallyldimethylammoniumchloride (DADMAC). Alkyl groups typically represent C1-C4alkyl.

"Zwitter-ionic monomer" means the polymerized molecule containing cationic and anionic (charged) functional groups in equal proportions, so that the molecule as a whole is neutral. Typical zwitter-ionic monomers includeN,N-dimethyl-Nacryloyloxy-N(3-sulfopropyl)-ammoniation,N,N-dimethyl-Nacrylamidoethyl-N(2-carboxymethyl)-ammoniation,N,N-dimethyl-Nacrylamidoethyl-N(3-sulfopropyl)-ammoniation,N,N-dimethyl-Nacrylamidoethyl-N(2-carboxymethyl)-ammoniation, 2-(methylthio)amylmetacresol-S-(sulfopropyl)-sulfonylation, 2-[(2-acrylonitril)dimethylammonio] ethyl-2-methylfolate, 2-(acryloyloxy)-2'-(ammonium)ethylphosphate,

[(2-acrylonitril)dimethylammonio]methylphosphonous acid,

2-methacryloyloxyethyl (MPC), 2-[(3-acrylamidoethyl)dimethylammonio]ethyl-2'-isopropylacetate (AAPI), 1-vinyl-3-(3-sulfopropyl)imidazolylidene,

(2-acrylonitril)karboksimetiltsellyulozy, 1-(3-sulfopropyl)-2-vinylpyridinium,N(4-sulfobutyl)-Nmethyl-N,N-diallylmalonate (MDABS),N,N-diallyl-Nmethyl-N(2-sulfoethyl)ammoniate is n, and the like.

"The paper production process" means a method of manufacturing paper products from pulp, including the formation of water pulp and billets for the production of paper pulp, dewatering the pulp to form a sheet and drying the sheet. Stages of pulp and paper, draining and drying can be conducted by any conventional method, generally known to experts in this field. Conventional microparticles, alum, cationic starch or a combination of them can be used as a Supplement to the handling of the polymers according to this invention, although it should be emphasized that for effective drying action no additives is not required.

Preferred embodiments of the

Functionalized aldehyde polymers according to the present invention prepared by the interaction of the polymer containing amino or aminogroup, with one or more aldehydes. The polymer containing amino or aminogroup may have different structures, including linear, branched, star-shaped, block, graft, dendrimers and the like.

Preferred polymers containing amino or aminogroup include polyamine and polyamides. Polyamine and polyamides can be obtained by copolymerization of the monomers in the conditions of formation of free radicals, using any number is about methods, including emulsion polymerization, dispersion polymerization and polymerization in solution.

Polyamine can be obtained by modification of a previously received polyamide, for example, by hydrolysis of a copolymer of acrylamide with vinylformamide, using acid or base as described in U.S. patent 6610209 and 6426383.

Polyaminoamide can also be obtained by direct amidation polyalkylene acids and transaminirovania copolymers containing units of carboxylic acid and (meth)acrylamide, as described in U.S. patent 4919821.

"Emulsion polymer" and "latex polymer" means a polymer emulsion containing in the aqueous phase functionalized aldehyde polymer according to the present invention, hydrocarbon oil as oil phase and an emulsifier of the type "water in oil". Reverse the polymer emulsion has a continuous hydrocarbon phase with a water-soluble polymer, dispergirovannykh in the hydrocarbon matrix. Inverted polymer emulsions are thus "inverted" or activated for use by the release of the polymer from the particles, applying a shear thinning and, usually, other surfactants. Cm. U.S. patent 3734873 entered here by reference. Typical methods of obtaining inverted emulsions of high molecular weight polymers are described in U.S. patents 2982749; 3284393 the 3734873. Cm. also Hunkeler, et al.,"Mechanism, Kinetics and Modeling of the Inverse-Microsuspension Homopolymerization of Acrylamide", Polymer, vol. 30(1), pp 127-42 (1989); Hunkeler et al.,"Mechanism, Kinetics and Modeling of Inverse-Microsuspension Polymerization: 2. Copolymerization of Acrylamide with Quaternary Ammonium Cationic Monomers", Polymer, vol. 32(14), pp 2626-40 (1991).

The aqueous phase is prepared by mixing in water one or more water-soluble monomers and any polymerization additives such as inorganic salts, chelating additives, pH buffers, and the like.

An oil phase is prepared by mixing an inert hydrocarbon liquid with one or more oil-soluble surfactant. Surfactant blend should have a low hydrophilic-lipophilic balance (products HLB)to provide the emulsion with a continuous oil phase. Suitable surfactants for polymerization in emulsion water in oil, which are commercially available, are listed in the North American edition McCutcheon''s Emulsifiers &Detergents. You may need to heat the oil phase to ensure the formation of a homogeneous oil solution.

Then the oil phase is loaded into a reactor equipped with a stirrer, a thermocouple, a tube for blowing nitrogen and condenser. The aqueous phase is added to the reactor containing the oil phase with vigorous stirring to form an emulsion. The resulting emulsion is heated to the desired temperature, rinsed with nitrogen and add the initiator radical in which imerissia. The reaction mixture is stirred for several hours in a nitrogen atmosphere at a desired temperature. Upon completion of the reaction the polymer emulsion of water in oil is cooled to room temperature, when may be added any desired post-polymerization additives such as antioxidants or surfactant with a high products HLB (as described in U.S. patent 3734873).

The obtained emulsion polymer is a freely flowing liquid. An aqueous solution emulsion polymer "water in oil" can be created by adding the desired amount of emulsion polymer in water with vigorous stirring in the presence of a surfactant with a high products HLB (as described in U.S. patent 3734873).

"Dispersion polymer" means a water-soluble polymer dispersed in a continuous aqueous phase containing one or more organic or inorganic salts and/or one or more aqueous solutions of polymers. Typical examples of the dispersion polymerization of water-soluble polymers in the continuous aqueous phase can be found in U.S. patents 5605970; 5837776; 5985992; 4929655; 5006590; 5597859 and 5597858 and in European patents 183466, 657478 and 630909.

In a typical method of obtaining a dispersion of the polymer aqueous solution containing one or more inorganic or organic salts, one or more water-soluble monomers, additives of any polim the polarization, such as processing AIDS, halirous agents, pH buffers and water-soluble polymer stabilizer, is introduced into a reactor equipped with a stirrer, a thermocouple, a tube for blowing nitrogen and condenser water. The monomer solution is intensively stirred, heated to the desired temperature and then add the initiator of radical polymerization. The solution is rinsed with nitrogen, keeping the temperature and mixing for several hours. After that, the mixture is cooled to room temperature, and charged to the reactor any post-polymerization additives. Dispersions of water-soluble polymers with a continuous aqueous phase are free flowing liquids with a viscosity of product usually 100-10000 JV, measured at low shear.

In a typical method for the solution of polymer is prepared an aqueous solution containing one or more water-soluble monomers and any additional polymerization additives such as halirous agents, pH buffers, and the like. This mixture is loaded into a reactor equipped with a stirrer, a thermocouple, a tube for blowing nitrogen and condenser water. The solution rapidly stirred, heated to the desired temperature and then add one or more initiators for radical polymerization. The solution is rinsed with nitrogen, keeping the temperature and mixing for several is their hours. Typically, the viscosity of the solution during this period increases. After completion of the polymerization, the reactor is cooled to room temperature and then moved to storage. The viscosity of the polymer solution vary within wide limits and depend on the concentration and molecular weight of the active polymer component.

The polymerization reaction is initiated by any means, which leads to the formation of a suitable radical. Preferred thermal radicals, when radical compounds are formed during thermal homolytic dissociation azo-, peroxide, hydroperoxide and perepisnyh compounds. Especially preferred initiators are azo-compounds including 2,2'-azobis(2-amidinopropane)dihydrochloride, 2,2'-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis(isobutyronitrile) (AIBN), 2,2'-azobis(2,4-dimethylvaleronitrile) (AIVN), and the like.

The polymerization processes can be carried out as a batch or in stages. In the periodic process all of the reactive monomers react together, whereas in a staged or semi-continuous process, a portion of the reactive monomers is withheld from the reaction and added to over time, to affect change in the composition of the copolymer or the formation of particle dispersion.

Conditions the Oia reactions of polymerization and/or post-polymerization chosen to the resulting polymer containing amino or aminogroup, had a molecular weight of at least about 1000 g/mol, preferably from about 2000 to about 10000000 g/mol.

Then the polymer containing amino or aminogroup, functionalitywith reaction with one or more aldehydes. Suitable aldehydes include any compound containing at least one aldehyde functional group (-CHO), which are sufficiently active to react with amino - or aminopropane polymer. Typical aldehydes include formaldehyde, paraformaldehyde, glutaraldehyde, glyoxal and the like. Preferred glyoxal.

Polymer functionalized aldehyde, obtained by reaction of polyamide or polyamine with the aldehyde at a pH of from 4 to 12. The total concentration of the main polymer chains plus the aldehyde is from about 5 to about 35 weight percent. In General, for a better control of the reaction rate and to improve the stability of the product prepared aqueous solution of the main polymer chains. the pH of the aqueous solution of the basic polymer chains increases to a value of from about 4 to about 12. The reaction temperature is usually from about 20 to about 80C, preferably from about 20 to about 40C. an Aqueous solution of the aldehyde is added to aqueous solution of the basic polymer chains when the choir is Shem stirring, in order to prevent gelation. After addition of the aldehyde pH adjusted to a value from about 4 to about 12, in order to achieve the desired reaction rate. After installing the pH number once unreacted amide/amine is typically optimal for the given relations of aldehyde to amide/amine, and the number of double-reacted amide/amine little. The speed of increasing the viscosity of the track during the reaction by using a Brookfield viscometer. The viscosity increase by 0.5 SP indicates an increase in molecular weight of the polymer and increasing the number of double-reacted amide/amine. The number once unreacted amide/amine when the increase in viscosity is usually preserved, but the number of double-reacted amide/amine increases with viscosity. Typically, the desired increase in viscosity corresponds to the desired level once unreacted amide/amine, double-reacted amide/amine and molecular weight. The reaction rate depends on temperature, full concentration of the polymer and the aldehyde, the relationship of the aldehyde functional amido/amino groups and pH. Higher speed glyoxaline expected, when increasing the temperature, the total concentration of the polymer and aldehyde, aldehyde functional amido/amino groups or pH. The reaction rate m which can be reduced by reducing the total concentration of polymer and aldehyde, temperature relations of the aldehyde functional amido/amino groups or pH (from about 2 to about 3.5). The amount of unreacted aldehyde to the end of the reaction increases with increasing ratio of aldehyde functional amido/amino groups. However, the full amount once reacted and reacted twice amide/amine becomes larger.

For example, the reaction of a copolymer of diallyldimethylammoniumchloride and acrylamide molar composition 95/5 with glyoxal at a molar ratio of from 0.4 to 1 glyoxal to acrylamide leads to a copolymer of acrylamide/DADMAC molar composition 95/5 to about 15-23 molar percent once reacted and reacted twice acrylamide and from about 60-70 mole percent unreacted glyoxal at a target viscosity of the product and the molecular weight. The molar ratio of glyoxal to acrylamide from 0.8 to 1 leads to a copolymer of acrylamide/DADMAC molar composition 95/5 to about 22 to 30 molar percent once reacted and reacted twice acrylamide and from about 70 to 80 mole percent of unreacted glyoxal at a target viscosity of the product and the molecular weight.

The shelf life of the product depends on the storage temperature, the viscosity of the product, the full amount of unreacted amide/amine, full concentration of the polymer and ALD is a guide, the relationship of the aldehyde functional amido/amino groups and pH. Usually the pH of the product is maintained at the low level (from 2 to 3.5), and the total concentration of the polymer and the aldehyde is optimized to increase shelf life.

Reaction conditions are chosen so that at least about 15 mole percent, preferably at least about 20 mole percent of the amino - or aminogroup in the polymer reacted with the aldehyde to form the polymer, functionalized aldehyde. The resulting polymers, functionalized aldehyde, have srednevekovoi molecular weight of at least about 100,000 g/mol, preferably at least about 300000 g/mol.

In a preferred aspect of this invention the polymer, functionalized aldehyde, is a polyamide, functionalized aldehyde.

In another preferred aspect, the polyamide functionalized aldehyde, is a polymer functionalized with aldehyde containing 100 mole percent of one or more nonionic monomers.

In another preferred aspect, the polyamide functionalized aldehyde, is a copolymer, functionalized aldehyde containing from about 5 to about 99 mole percent of one or more acrylamide monomers and from about 95 mole percent to primers is 1 mole percent of one or more cationic, anionic or zwitter-ionic monomers, or a mixture.

Copolymers derived from non-ionic monomers and cationic monomers preferably have a cationic charge of from about 1 to about 50 molar percent, more preferably from about 1 to about 30 molar percent.

Copolymers derived from non-ionic monomers and anionic monomers, preferred are anionic charge of about 1 to about 50 molar percent, more preferably from about 1 to about 30 molar percent.

Amphoteric polymers preferably have an overall positive charge. Preferred amphoteric polymers contain up to about 40 mole percent of cationic monomers and up to about 20 mole percent of anionic monomers. Preferred amphoteric polymers contain from about 5 to about 10 mole percent of cationic monomers and from about 0.5 to about 4 mole percent of anionic monomers.

Zwitter-ionic polymers preferably contain from 1 to about 95 mole percent, preferably from 1 to about 50 molar percent of zwitter-ionic monomers.

In one preferred aspect of this invention, the polyamide functionalized aldehyde, is a copolymer, functionalized aldehyde containing from about 1 to about 99 mole is Rozental one or more acrylamide monomers and from about 99 molar percent to about 1 mole percent of one or more cationic, anionic or zwitter-ionic monomers, or a mixture.

In another preferred aspect, the polyamide functionalized aldehyde, is a copolymer, functionalized aldehyde containing from about 50 to about 99 mole percent of one or more acrylamide monomers and from about 50 to about 1 mole percent of one or more cationic monomers.

In another preferred aspect, the polymer, functionalized aldehyde, is a copolymer containing from about 50 to about 99 mole percent of one or more acrylamide monomers and from about 50 to about 1 mole percent of one or more cationic monomers, and the copolymer functionalized glyoxal.

In another preferred aspect, the cationic monomer is diallyl-N,N-disubstituted ammoniagenesis monomer.

In another preferred aspect from about 20 to about 50 mole percent of aminogroup copolymer reacted with glyoxal.

In another preferred aspect, the nonionic monomer is acrylamide and diallyl-N,N-disubstituted ammoniagenesis monomer is diallyldimethylammoniumchloride with a molecular weight of at least 300,000 g/mol.

In another preferred aspect, the functionalized polymer is a copolymer, sod is Rasim from about 70 to about 99 mole percent of acrylamide and from about 1 to about 30 mole percent of diallyldimethylammoniumchloride, functionalized glyoxal.

In another preferred aspect from about 20 to about 26 mole percent of aminogroup copolymer reacted with glyoxal.

Polymers functionalized with aldehyde suitable for dehydration of all grades of paper and cardboard, and are preferred varieties of cardboard and tissue paper. Especially helpful are the sorts of cardboard made from paper waste using OSS (old corrugated containers) mixed waste or without them.

A suitable increase dehydration can be achieved with a dose of polymer, functionalized aldehyde, in the range from 0.05 to 15.0 lbs polymer/ton dry fiber, and best results are usually obtained in the range from 0.5 to 3.0 lb/ton depending on the particular circumstances of paper production (paper-making equipment and raw materials used for paper production).

Functionalized aldehyde polymers according to the invention can be added to traditional wet parts used for the conventional additives in the wet part. They include a paper weight skinny (sweet paste) or fatty meal. Specific place wet part is important fro, but functionalized aldehyde polymers are preferably added before adding dragaction additives. As it is believed that the polymers functionalized aldehyde, act as adjuvants for pressing, adding them to the wet part is not necessary, and may also be practiced option of adding them directly before pressing part after molding of the sheet. For example, the polymer can be napalan on a wet cloth before putting on the press section, and this may be the preferred method of adding to reducing the dosage or interference effects, which can occur in the wet end. In combination with polymers, functionalized aldehyde, can be applied to other traditional wet end additives. They include holding excipients, additives to improve strength, such as starches, sizing and the like.

When using these polymers, functionalized aldehyde having the resulting anionic charge, you need a way of fixing the polymer to the fiber. This fixation is usually performed with the use together with the polymers of cationic materials. Such cationic materials are most often coagulants, or inorganic (e.g., alum, polyaluminium, chloride or ferric sulfate, and any other cationic gidrolizuemye salts)or organic (e.g.p-DADMAC, EPI/DMA, PEI modified PEI or any of the other polymers with high charge density and a molecular weight from low to medium). In addition, cationic materials are added for other purposes, such as starch, additives for strength in the wet state or retention additives, can also serve for fixing anionic polymer. Additional additives for fixing filled with cationic polymers, functionalized aldehyde, is not required.

The foregoing will be better understood with reference to the following examples, which are presented for purposes of illustration and are not intended to limit the scope of the invention.

Example 1

Obtaining a copolymer of acrylamide/DADMAC composition 95/5 mol%.

In a 1500-ml reaction flask equipped with a mechanical stirrer, a thermocouple, a condenser, a tube for blowing nitrogen and hole for supplements, add 116,4 g deionized or soft water, 26,3 g of phosphoric acid, to 63.8 g of a 62%aqueous solution of diallyldimethylammoniumchloride (Nalco Company, Naperville, IL), 7.6 g of sodium formate and 0.09 g of Terentieva salt of ethylenediaminetetraacetic acid. The reaction mixture is stirred at a speed of 400 rpm and the pH set to the value from 4.7 to 4.9 using 17.3 g of 50%aqueous sodium hydroxide solution. The resulting mixture was heated to 100C and rinsed with nitrogen at 50 ml/min after reaching 100C in the reaction mixture for 135 minutes add 17,6 g 25,0%aqueous solution of ammonium persulfate. Five m the chickpeas after the start of addition of ammonium persulfate in the reaction mixture was added 750,9 g 49,5%aqueous solution of acrylamide within 120 minutes. The reaction is maintained at 100C for 180 minutes after the addition of ammonium persulfate. Then the reaction mixture was cooled to ambient temperature and adjusted pH to a value of 5.2 to 5.8 using 50%aqueous solution of sodium hydroxide or concentrated sulfuric acid. The product is a viscous solution from clear to amber. The product has a molecular weight of about 20,000 g/mol.

Example 2

Pixillion copolymer of acrylamide/DADMAC composition 95/5 mol% glyoxal when the molar ratio of the acrylamide from 0.8 to 1 if 9.0% of active ingredients (glyoxal and polymer in amount).

In a 2000-ml reaction flask equipped with a mechanical stirrer, thermocouple, condenser, orifice for additives and sampling valve at the bottom of the reactor, add 238,0 g of a 41%aqueous solution of copolymer of acrylamide/DADMAC composition 95/5 mol%, obtained as in example 1, and 1304,0 g deionized or soft water. The polymer solution is stirred at a speed of 400 Rev/min the pH of the solution set to a value ranging from 8.8 to 9.1 by the addition of 5.8 g of 50%aqueous sodium hydroxide solution. Set the reaction temperature from 24 to 26C. In the reaction mixture for 20-30 minutes add glyoxal (143,0 g 40%aqueous solution). After adding glyoxal viscosity of the reaction mixture according to Brookfield (programmable viscometer Brookfield LVDV-H, the spindle LV #1 at 60 rpm, Brookfield Engineering Laboratories Inc., Middleboro, MA) is approximately 4 to 5 SP. the pH of the reaction mixture set to a value of from 7.5 to 8.8 using a 10%aqueous solution of sodium hydroxide (25 g)is added over 20-30 minutes. The viscosity of the reaction mixture according to Brookfield (programmable viscometer Brookfield LVDV-II+, spindle LV #1 at 60 rpm, Brookfield Engineering Laboratories Inc., Middleboro, MA) is from about 4 up to 5 CPS after adding sodium hydroxide. the pH of the reaction mixture is maintained at from about 7.0 to 8,8 at about 24-26C with good stirring. Track viscosity by Brookfield, and after exceeding the desired viscosity of 1 or more 1 SP (from 5 to 200 SP, > 100000 g/mol) pH of the reaction mixture is reduced to a value from 2 to 3.5 by adding sulfuric acid (93%)to significantly reduce the reaction rate. The rate of increase of viscosity depends on the pH and the reaction temperature. The higher pH of the reaction mixture, the faster the viscosity. The rate of increase of viscosity regulate by lowering the pH of the reaction mixture. The product is liquid clear to hazy, colorless to amber, with a viscosity according to Brookfield, greater than or equal to 5 CPS. The resulting product is more stable during storage, when the viscosity by Brookfield is less than 40 SP, and when the product is diluted with water to a smaller percentage of the active components is tov. The product can be obtained with more or less full content of the active components by setting the desired viscosity of the target product. NMR analysis of the samples indicates that approximately 70 to 80% glyoxal not reacted, and that from 15 to 35 mole percent of units of acrylamide reacted with glyoxal with the formation of once and twice unreacted acrylamide.

Example 3

The efficiency for typical polymers functionalized aldehyde.

Impact on dehydration pixillion polymers of DADMAC/acrylamide obtained when the molar ratio of glyoxal to acrylamide (hereinafter referred to as the ratio G/A) of 0.1, and 0.2, 0.4 and 0.8 were assessed using tests of the paper machine. The relative characteristics of the polymers obtained by using the ratio D/A of 0.1, 0.2 and 0.8 are compared with the characteristics of the polymer obtained at a molar ratio of 0.4. The tests were carried out on a Fourdrinier paper machine with dual pressure box, using pulp, recycle linerboard made from 100%OCC raw materials, and corrugating medium. The real conditions of the paper machine has varied depending on the specific quality of the produced paper. In all cases we used the program retention polyaluminosilicate submitted the weight fatty grinding, and cationic flocculant supplied to the mass skinny grinding. For varieties of plasterboard were also feeding in thin raw material sizing ASA. Pixillion acrylamide polymers were applied through a sprayer boom on the back side of the top layer to merge with the lower layer, although earlier studies showed that the effect of dehydration could also be achieved by adding mass skinny or fat grinding in the wet part.

The dewatering effect of the polymers is measured based on the changes in steam pressure in the drying part of the machine that is provided by computer system DCS (distribution control system) with response time in milliseconds. The humidity of the sheet roll is measured online and is supported by setting the vapor pressure (measurement of steam consumption or energy consumption). Lower the humidity of the sheet in the roll reflects the lower the humidity of the sheet that goes on the drying part or, equivalently, the best dehydration in the parts of the machine prior to the dryer section. Thus, the smaller steam load, the measured pressure corresponds to the improved dewatering. If the vapor pressure in these sections fall to the level where the operator believes that it can certainly deal with the usual fluctuations in steam load it manually increases the speed Machinima change the type of polymer or dosage, closely monitoring the steam pressure in one of the steam sections to see if there has been any changes, with due regard for the changes in performance when it happens. The initial impact of more dry sheet is observed at a lower relative humidity to be found in the roll. However, this drop in relative humidity is brief due to the automatic control, leave as a permanent result, reminiscent of any produced by the dewatering effect, only the lower pair. The moisture content of the sheet is also influenced by many other factors, apart from the addition of polymer, functionalized aldehyde, but most of them, such as changes in raw materials, occurs over a longer time frame than the effect of the reduction pair induced by the addition of polymer, in particular when it is put on the table by covering coating. Consequently, reducing the vapor pressure is the best indicator of dehydration of the polymer than the average performance or the speed of the machine, as these measures are more easily mixed with other factors, which act on the speed of the machine.

Example 3a

Comparison of the polymer in the ratio G/A=0.1 s polymer having a ratio D/A=0,4.

The comparison of these two polymers was conducted on 42 pounds of plasterboard in from OUTSTA starch wet end. After establishing a baseline for the polymer with respect to G/A=0,4 at 2.0 lb/t are replaced on the polymer with respect to G/A=0,1 at 2.2 lb/T. Almost immediately evident that the sheet roll consistency is more moist, and steam load increases to a maximum after about 1 h, which requires re-introduction of the polymer with respect to G/A=0,4, to prevent slowing down of the paper machine. To regain control of the machine, you need 3 lbs/t polymer with the ratio D/A=0.4, and this Supplement causes a sharp decrease in the vapor pressure of 12 psi for 15 minutes Later recovered reference line with the polymer when the ratio D/A=0.4 to 2 lb/ton, followed by replacement of the polymer with respect to G/A=0.1 if a greater dose of 3.4 lb/T. When such a much higher dose of steam pressure again increases gradually for about one hour to the point where it is necessary to return to the polymer with respect to G/A=0,4, to prevent slowing down of the machine. Again, when the polymer with the ratio D/A=0.4 are added at a dose of 3.0 lb/ton, the vapor pressure decreases rapidly, 12 psi for 15 min, and this reduction can be maintained even when the dosage of the polymer with respect to G/A=0,4 reduced to 2 lb/T. the Polymer with respect to G/A=0,1 couldn't keep the steam pressure and, consequently, the speed of the machine, achieved with poly is a leader with respect to G/A=0,4, even at the dosage of 70%, higher. There were no changes in the details of strength for this grade (Mullen and Scott bond), when the polymer with respect to G/A=0.1 was replaced by the polymer with respect to G/A=0,4.

Example 3b

Comparison of the polymer with respect to G/A=0.2 with a polymer having a ratio D/A=0,4.

The comparison of these two polymers was carried out on 35 pounds of plasterboard at 5 lb/ton of starch wet end, introduced into the fatty raw materials grinding. After establishing a baseline of the polymer with respect to G/A=0,4 at 2.0 lb/t, it is replaced by the polymer with the ratio D/A=0.2 at 2.2 lb/so When the dosage is measured moderate increase in the vapor pressure of 5 psi for a period of about an hour. Re-introduction of the polymer with respect to G/A=0,4 leads to an immediate drop in humidity in the roll and the rapid drop in steam pressure at 3 psi for 10 minutes Switching at this point again on the polymer with respect to G/A=0.2 at 2.2 lb/ton remains rather constant steam pressure for about one hour with an increase of only 2 psi. Again, the reintroduction of 2 pounds of the polymer with respect to G/A=0,4 leads to a rapid drop in steam pressure at 8 psi for 20 min, indicating an improvement of dehydration. From these results it follows that the polymer with the ratio D/A=0.2 is definitely demonstrates the ability of dehydration,but even if you increase the dosage by 10% it cannot maintain pressure, achieved with the polymer with respect to G/A=0,4. In addition, in contrast to polymer ratio D/A=0.1, polymer with respect to G/A=0.2 is able to keep the machine operating at the desired speed, although at elevated compared to polymer ratio G/A=0,4 steam load and dosage. The results of the tests with these three polymers indicate that the polymer with the ratio D/A=0.4 give the best dehydration than the polymer with respect to G/A=0.2 and he, in turn, gives the best dehydration than the polymer with respect to G/A=0,1. No change in strength characteristics for this grade (STFI), when the polymer with respect to G/A=0.2 was replaced by the polymer with respect to G/A=0,4, were noted.

Example 3c

Comparison of the polymer with respect to D/A=0.8 a with a polymer having a ratio D/A=0,4.

Based on the discovery that the increase of the ratio G/A upon receipt of the polymers increases dehydration, was received even greater ratio G/A, is equal to 0.8, and evaluated on the same paper machine. Comparison of the polymer with respect to D/A=0.8 s polymer with respect to G/A=0,4 were conducted on 33 pounds shirring environment in the absence of starch in the wet end. The addition of the polymer with respect to G/A=0,4 at a dose of 2.0 lb/t leads to a very good reduction of the vapor pressure of 21 psi after about 2 hours, when 2 lbs/t polymer with respect to G/A=0,4 was is replaced by 1.5 lb/ton of polymer with respect to G/A=0,8. Even with a 25 percent reduction in dosing addition of the polymer with respect to G/A=0,8 leads to further reduction of the vapor pressure of 3 psi, and after 0.5 hours after it was removed there was a sharp increase in the vapor pressure of 12 psi. Further tests were conducted on 26 lb corrugating medium in the absence of starch in the wet end. Starting again with 2.0 lb/ton of polymer with respect to G/A=0,4, to establish the base line, replacement of 2.0 lb/ton of polymer with respect to G/A=0,8 leads to the reduction of the vapor pressure of 7 psi for 60 min, which is further reduced to 4 psi after 10 minutes, when the dosage was increased to 3 lb/so reducing the dosage of the polymer with respect to D/A=0.8 to 3 lb/t just to 1.0 lb/t leads to an increase in steam pressure, but it remains at 8 psi below the value to 2.0 lb/ton of polymer with respect to G/A=0,4, even when increasing the machine speed 30 ft/min

From these tests it follows that the polymer with respect to G/A=0,8, apparently, gives the equivalent dehydration at a dosage of less 25-50%than is required for the polymer with respect to G/A=0,4. Characteristics of strength for both varieties of medium quality (Concorra)obtained polymer with the ratio D/A=0.8, the given value is equal to or greater than the values obtained with the polymer with respect to G/A=0,4, even if the dosage is in General below.

N the basis of the results of these tests detected, the increase in G/A when obtaining polymers, functionalized aldehyde, provides increased activity of dehydration, preferably a ratio greater than 0,4.

In the composition, operation or scheme described here, the method according to the invention can be made without deviating from the principles and scope of the invention as defined in the claims.

1. Method for improving the dewatering of a paper sheet on the paper machine, characterized in that it comprises adding to a paper sheet from approximately 0.05 lb/ton to about 15 lb/ton dry fiber one or more polymers, functionalized aldehyde containing amino or aminogroup, where at least about 15 mol.% amino - or aminogroup functionalized by reaction with one or more aldehydes, and where the polymers, functionalized aldehyde, have srednevekovoi molecular weight of at least about 100,000 g/mol.

2. The method according to claim 1, characterized in that the functionalized aldehyde polymers selected from the group consisting of polyamines, functionalized aldehyde, and polyamides, functionalized aldehyde, and the aldehyde is selected from formaldehyde, paraformaldehyde, glyoxal, and glutaraldehyde.

3. The method according to claim 1, characterized in that functionalitv the hydrated aldehyde polymer is functionalized aldehyde polyamide, and this functionalized aldehyde polymer contains 100 mol.% one or more nonionic monomers.

4. The method according to claim 2, characterized in that the functionalized aldehyde polyamide is functionalized aldehyde copolymer containing from 5 to 99 mol.% one or more acrylamide monomer and from 95 to 1 mol.% one or more cationic, anionic or zwitter-ionic monomers, or mixtures thereof.

5. The method according to claim 4, characterized in that the functionalized aldehyde polyamide is functionalized aldehyde copolymer containing from 1 to 50 mol.% one or more anionic monomers and from 99 to 50 mol.% one or more nonionic monomers.

6. The method according to claim 4, characterized in that the functionalized aldehyde polyamide is functionalized aldehyde copolymer containing from 1 to 30 mol.% one or more anionic monomers and from 99 to 70 mol.% one or more nonionic monomers.

7. The method according to claim 4, characterized in that the functionalized aldehyde copolymer is functionalized aldehyde amphoteric polymer containing up to 40 mol.% one or more cationic monomers and up to 20 mol.% one or more anionic monomers.

8. The method according to claim 4, characterized in that the functionalized aldehyde copolymer is functioning lisovanim aldehyde of zwitter-ion polymer containing from 1 to 95 mol.% one or more zwitter-ionic monomers.

9. The method according to claim 4, characterized in that the functionalized aldehyde polyamide is functionalized aldehyde copolymer containing from 50 to 99 mol.% one or more acrylamide monomer and 50 to 1 mol.% one or more cationic monomers, and at least 20 mol.% amide groups of the polyamide reacted with the aldehyde.

10. The method according to claim 1, characterized in that the functionalized aldehyde polymer is a copolymer containing from 50 to 99 mol.% one or more acrylamide monomer and 50 to 1 mol.% one or more cationic monomers, where the functionalized copolymer glyoxal, and cationic monomer is diallyl-N,N-disubstituted ammonium)halide monomer and from 20 to 50 mol.% amide groups of the copolymer are reacted with glyoxal.

11. The method according to claim 10, characterized in that the nonionic monomer is acrylamide, and (diallyl-N,N-disubstituted ammonium)halide monomer is diallyldimethylammoniumchloride with a molecular weight of at least 300,000 g/mol.

12. The method according to claim 11, characterized in that the functionalized aldehyde polymer is a copolymer containing from 70 to 99 mol.% acrylamide and from 1 to 30 mol.% diallyldimethylammoniumchloride, functionalized g is ioxilan.

13. The method according to item 12, characterized in that the paper sheet is added from about 0.5 lb/t to about 3 lb/ton, based on dry fiber, pixilang copolymer.

14. The method according to claim 1, characterized in that the functionalized aldehyde polymer is sprayed on the paper sheet to press dewatering.



 

Same patents:

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

EFFECT: higher sizing efficiency with good drainage, retention and serviceability of papermaking machine.

24 cl, 3 tbl, 4 ex

FIELD: cardboard for packaging of liquid foods.

SUBSTANCE: cardboard has one of layers containing additives of metal salt, metal oxide or enzymes for decomposing of disinfecting composition, in particular, hydrogen peroxide, or reacting therewith for obtaining of gas serving as barrier for penetration of the given disinfecting composition through edges into cardboard.

EFFECT: increased efficiency in protecting of cardboard from penetration of disinfecting composition into cardboard and, accordingly, into liquid food.

8 cl, 1 tbl, 1 dwg, 1 ex

The invention relates to a rheology modifiers to achieve the thickening effect, regulating the expiry of water retention and other properties of aqueous systems

The invention relates to a method of preventing loss of whiteness (brightness) and increase resistance to yellowing in the pulp and paper

FIELD: paper.

SUBSTANCE: paper base contains fibers of coniferous and deciduous wood, or their mixtures, which have average length that is more or equal to 75 mcm and have filler fixed to part of these fibers, and also less than 50 wt % of fibers have average length less than 75 mcm from total weight of base. Paper mass is produced by contact of deciduous or coniferous wood fibers or their mixtures having average length of 75 mcm and having filler fixed to part of mentioned fibers, with fibers average length of which is less than 75 mcm, from total weight of base.

EFFECT: improved smoothness of paper.

20 cl, 25 dwg, 3 tbl, 3 ex

FIELD: textiles; paper.

SUBSTANCE: betulin is meant for being used as filler for paper or cardboard manufacturing. Betulin water suspension is obtained, and then it is added to cellulose pulp during paper or cardboard manufacturing. Water is removed from paper web. Paper or cardboard manufacturing is continued using a conventional method.

EFFECT: improving retention ability of filler, formation light, strength and lightness of paper, providing high volume and low porosity for increasing water impermeability, and preventing brightness reversion of cellulose pulp.

12 cl, 2 tbl, 3 ex, 4 dwg

FIELD: textiles; paper.

SUBSTANCE: method (versions) concerns manufacture of paper and can be used in the paper and pulp industry. Method includes (i) providing a water suspension, which contains cellulose fibres; (ii) adding to the suspension after all the stages of strong shearing action of the first polymer, which is a cationic polymer; a second polymer and a third polymer, which is an organic or inorganic anionic polymer; and (iii) dehydration of the obtained suspension for forming paper.

EFFECT: improvement in the drainage and retention for all types of paper stock, increasing the speed of the papermaking machine, using low doses of polymers, improving the method of paper manufacturing and increasing the economic efficiency of the process.

16 cl, 7 tbl, 7 ex

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

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24 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

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EFFECT: lower consumption of reinforcing and flocculating polymers, improved pulp water yield on papermaking machine grid and enhanced consumer paper properties including paper air permeability.

4 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to water-soluble polymer dispersion and method of its obtaining, its application, method of paper production from water suspension. Dispersion includes following components: dispersed polymer, consisting of water-soluble monomer A and water-soluble cationic monomer B, at least one polymeric stabiliser C in amount approximately from 0.05 to approximately 10% wt and co-stabiliser D cationic polyelectrolyte in amount approximately from 1 to approximately 25% wt relative to total dispersion weight. In polymer dispersion there are no essential amounts of salts of inorganic multivalent anion. Dispersed polymer consists of: a) approximately from 50 to approximately 99% molar monomer A, which represents compound of general formula I , where R1=H or methyl, R2=H, methyl, ethyl, isopropyl, metiloil, hydroxyethyl or 2-hydroxypropyl, and b) approximately from 1 to approximately 50% molar monomer B, representing compound of general formula II , where R1 = H or methyl, R3, R4, R5 - independently on each other H, alkyl(C1-C8), benzyl or alkylbenzyl , A=NH, O, B=alkyl(C1-C10) or hydroxyalkyl(C1-C10), X-=anionic counter-ion. Polymer stabiliser C represents copolymer, which contains at least, one monomer, selected from group, including diallyldimethylammonium chloride (DADMAC), vinylpyridonium chloride, N-vinylimidazoline chloride, vinylbenzyltrimethylammonium chloride and their mixture, and/or compound of general formula II and one of compounds of general formula III, IV and V. Compound of general formula III represents polyether with one functional end allyl group , where R1=H or methyl, R6 = independently on each other H, methyl or ethyl, n=1 or 3, x = from 5 to 50 and y = from 5 to 50. Compound of general formula IV is macroinitiator , where R1=H or methyl, R6 = independently on each other H, methyl or ethyl, R7, R8 = independently on each other alkyl, cyanoalkyl, carbalcoxyalkyl, (C1-C8), n=1 or 3 and x = from 5 to 100. Compound of general formula V represents polyether with one functional end vinyl group , where R1=H or methyl, R6=H, methyl or ethyl, n = 1 or 3 and x = from 5 to 50. Weight ratio of stabilisers and co-stabilisers to dispersed polymer is C+D/ A+B<1. Method of obtaining dispersion is in polymerisation of said above components in one stage. Dispersion is used as additive for improvement of retention in production of paper, as thickener and/or as additive for improvement of dirt-repellent properties. Method of paper production from water suspension, which contains cellulose fibres and non-obligatory fillers, lies in addition to suspension of said above water-soluble polymer dispersion. Then forming is carried out and suspension is dried on net.

EFFECT: obtaining water-soluble polymer dispersion with low viscosity and high molecular weight, increase of serviceable life in storage.

23 cl, 3 tbl, 25 ex

FIELD: paper making.

SUBSTANCE: composition for manufacture of paper has flocculating cationic polymeric retention means, phenol resin, and polyethylene oxide. Cationic polymeric retention means is liquid aqueous cationic polymer dispersion free of solvent and oil phase and having viscosity of from 2,000 to 20,000 mPa˙s at concentration of 1%. Cationic polymeric retention means may be added into composition in conjunction with phenol resin or separately from it at other point. It may be also used for preliminary treatment of filler which is to be further added to composition.

EFFECT: increased extent of retention and dehydration of composition for manufacture of paper, high quality of paper sheets and reduced manufacture costs.

11 cl, 4 dwg, 5 tbl, 3 ex

FIELD: pulp-and-paper industry, in particular, additive for pulp.

SUBSTANCE: product contains first polysaccharide having at least one first cationic substituent comprising aromatic group, and second polysaccharide having at least one second cationic substituent free of aromatic group. Method for producing of paper from water suspension containing cellulose fibers and, optionally, fillers involves adding cationized polysaccharide product to water suspension; forming and dehydrating water suspension on fabric, said cationized polysaccharide product being produced by providing reaction between first polysaccharide with at least one first aromatic agent, and second polysaccharide with at least one second agent free of aromatic group; mixing resultant polysaccharides.

EFFECT: improved dehydration and retention capacity through utilization of cationized polysaccharide product.

25 cl, 11 tbl, 10 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: cellulose product contains clay having stacking of atomic planes 2R2. Product represents paper of fibrous pulp, while clay has cationic nature. Preparation of product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding clay having stacking of atomic planes 2R2.to suspension; and dehydrating thus prepared suspension. Another method of preparing cellulose product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding cationic clay to suspension; adding one or several draining auxiliary substances enhancing retention of filler and containing at least one cationic polymer; and dehydrating thus prepared suspension.

EFFECT: reduced interfering and harmful substance in cellulose suspension and enhanced retention of filler, dehydrating agents, and sizing agents.

27 cl, 14 tbl, 13 ex

FIELD: pulp-and-paper industry, in particular, manufacture of paper and cardboard.

SUBSTANCE: method involves preparing aqueous cellulose pulp; adding holding system into cellulose pulp system; draining pulp through cloth for forming of paper web; drying resultant paper web. Holding system comprises swelling clay having whiteness of at least 70.

EFFECT: increased whiteness of paper and improved filler retention capability.

16 cl, 1 tbl, 20 ex

The invention relates to an agent that increases the strength of paper in the wet state, and the method of its production, and method for producing a paper containing this agent
The invention relates to the manufacture of paper for corrugation and/or planar layers in the manufacture of corrugated cardboard

The invention relates to methods of making paper (including cardboard) and, in particular, to methods of making paper, reinforced with starch
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