Production method of paper

FIELD: textile, paper.

SUBSTANCE: according to one version, method includes provision of aqueous suspension that contains cellulose fibres. Addition of cation polysaccharide and polymer P2, which is an anion polymer, to produced suspension after all points of high polymer P1 shearing force, and P1 polymer is an anion polymer. Then water is removed from produced suspension to form paper. According to the other version, auxiliary agents are added for drainage and retention to produced suspension of cellulose fibres after all points of high shearing force. The latter are represented by a cation polysaccharide and polymer P2, being an anion polymer.

EFFECT: improved drainage without deterioration in retention and forming of paper, increased speed of paper-making machine and application of lower doses of polymer.

34 cl, 5 tbl, 5 ex

 

The present invention relates to a method for producing paper. More specifically, the invention relates to a method for producing paper which comprises adding cationic starch and polymer P2 to the aqueous pulp suspension after all points of high shearing forces and the removal of water from the obtained suspension to form paper.

The level of technology

In the field of paper production aqueous suspension containing cellulosic fibres, and optional fillers and additives, called mass, served through the pumps, sorters and cleaners, which is subjected to the weight of a large attrition efforts in the headbox, which throws the weight on the forming mesh. The water drain out through the mass forming the grid so that the grid is formed wet wet paper, and canvas additionally removes water and dried in the dryer section of the papermaking machine. Subsidiary means for the drainage and retention of traditionally introduced at different points of the mass flow in order to facilitate drainage and to increase the adsorption of fine particles such as fine fibers, fillers and additives on cellulose fibers, so that they will remain with the fibers on the grid. Examples of traditionally used assistive devices for drainage and retention include organic polymers, inorganic materials and their com is inali.

EP 0 234513 A1, WO 91/07543 A1, WO 95/33097 A1 and WO 01/34910 A1 discloses the use of cationic starch and anionic polymer in the methods of paper production. However, nothing is disclosed about adding both of these components to the suspension after all points of high shearing forces.

It would be useful to provide a way paper production with additional improvements in drainage, retention and formation.

Invention

According to the present invention it was found that the drainage can be improved without any significant deterioration of retention and formation of paper, or even with improvements in retention and formation of paper by way of receipt paper, including: (i) provision with an aqueous suspension comprising cellulosic fibers, (ii) adding to the suspension after all points of high shearing forces: cationic polysaccharide and a polymer P2, which is an anionic polymer; and (iii) removing water from the resulting suspension to form paper. The present invention provides improvements in drainage and retention in obtaining paper from all types of masses, in particular of the masses, with mechanical or recycled pulp, and pulp having a high salt content (high conductivity) and colloidal substances, and methods of paper production with a high degree of circuit wastewater, i.e. broad is th recirculation of waste water and the limited supply of fresh water. Thus the present invention makes it possible to increase the speed of the paper machine and the use of lower dosages of polymers to ensure a consistent effect of drainage and/or retention, thus leading to an improved method of producing paper and economic benefits.

The term "subsidiary means for drainage and retention", as used herein, refers to two or more components which, when added to the aqueous pulp suspension, provide better drainage and retention than obtained in the absence of adding the two or more components.

Cationic polysaccharide according to this invention can be selected from any polysaccharide, known in the art including, for example, starches, guar gums, cellulose, chitina, chitosans, glikana, galactanes, glucans, xanthan gums, pectins, mannans, dextrins, preferably starches and guar gums. Examples of suitable starches include potato, grain, wheat, tapioca, rice, waxy maize, barley, etc. Accordingly, the cationic polysaccharide is dispersible in water or preferably soluble in water.

Especially suitable polysaccharides according to the invention include those which have the General structural formula (I):

where P is the residue of a polysaccharide; A is a group that adds N to the residue of the polysaccharide, the corresponding chain of atoms, including atoms and H atoms and optionally O and/or N, usually alkalinous group with from 2 to 18 and, optionally, from 2 to 8 carbon atoms, optionally interrupted or substituted by one or more heteroatoms, for example O or N, for example, accelerograph or hydroxypropranolol group (-CH2-CH(OH)-CH2-); R1, R2and R3each is H or preferably a hydrocarbon group, respectively, alkyl containing from 1 to 3 carbon atoms respectively, 1 or 2 carbon atoms; n is an integer from about 2 to about 300000, respectively from 5 to 200,000 and preferably from 6 to 125,000 or, alternatively, R1, R2and R3together with N form an aromatic group containing from 5 to 12 carbon atoms; and X-is an anionic counterion, typically a halide like chloride.

Cationic polysaccharides according to the invention can also contain anionic groups, preferably in small quantities. These anionic groups can be introduced into the polysaccharide through chemical treatment or be present in a natural polysaccharide.

Srednevekovaja molecular weight cationic polysaccharide is modified in a wide the x limits depending on the type of polymer used, and usually it is at least about 5000, and often at least 10000. Often it is higher than 150000, usually above 500000, respectively, above approximately 700000, preferably above about 1,000,000 and most preferably above about 2000000. The upper limit is not critical; it can be about 200000000, usually 150000000 and, accordingly, 100000000,

Cationic polysaccharide may have a degree of cationic substitution (DSC), varying in a wide range, depending on, among other things, the polymer type; DSWithmay be 0.005 to 1.0, usually from 0.01 to 0.5, respectively, from 0.02 to 0.3, preferably from 0.025 to 0.2.

Typically, the charge density of the cationic polysaccharide is within the range from 0.05 to 6.0 mEq/g dry polymer, respectively, from 0.1 to 5.0 and preferably from 0.2 to 4.0.

Polymer P2 according to the present invention is an anionic polymer which may be selected from inorganic and organic anionic polymers. Examples of suitable polymers P2 include water soluble and dispersible in water inorganic and organic anionic polymers.

Examples of suitable polymers P2 include inorganic anionic polymers on the basis of silicic acid and silicate, i.e. anionic polymers oxide cream the Oia. Suitable anionic polymers on the basis of silicon oxide can be prepared by condensation polymerization of silicic compounds, for example silicic acids and silicates, which can be homopolymerization or copolymerization. Preferred anionic polymers on the basis of silicon oxide include anionic particles of oxide silicon, which are in the colloidal range of particle sizes. Anionic particles of oxide silicon is usually supplied in the form of aqueous colloidal dispersions, the so-called sols. Sols based on oxide of silicon can be modified and can contain other elements, such as aluminum, boron, nitrogen, zirconium, gallium and titanium, which may be present in the aqueous phase and/or the particles of oxide silicon. Examples of suitable anionic particles on the basis of silicon oxide include polysilicon acid, polychronicity the microgels, polysilicate, polysilicate the microgels, colloidal silicon dioxide, colloidal silicon dioxide, modified aluminum polyaluminosilicate, polyaluminosilicate the microgels, polyborazylene etc. Examples of anionic particles on the basis of silicon oxide include those disclosed in U.S. patents, № 4388150; 4927498; 4954220; 4961825; 4980025; 5127994; 5176891; 5368833; 5447604; 5470435; 5543014; 5571494; 5573674; 5584966; 5603805; 5688482; and 5707493; which are hereby incorporated in this description is the as references.

Examples of suitable anionic particles on the basis of silicon oxide include those that have an average particle size less than about 100 nm, preferably less than about 20 nm and more preferably in the range from approximately 1 to approximately 10 nm. As is customary in the chemistry of silica, the particle size refers to the average size of the primary particles, which can be aggregated or not aggregated. Preferably anionic polymer on the basis of silicon oxide includes aggregated anionic particles of oxide silicon. Specific surface area of particles of oxide silicon, respectively, at least 50 m2/g and preferably at least 100 m2/, In General, the specific surface area can be up to approximately 1700 m2/g and preferably up to 1000 m2/g Specific surface area measured by means of titration with NaOH as described G.W. Sears in Analytical Chemistry 28 (1956): 12, 1981-1983 and in U.S. patent No. 5176891 after appropriate removal or regulation of any compounds present in the sample, which could affect the titration, as a kind of aluminum and boron. This area thus represents the average specific surface area of particles.

In a preferred variant of the invention, the anionic particles of oxide, PU glue, which I have a specific surface area within the range from 50 to 1000 m 2/g, more preferably from 100 to 950 m2/, Preferably particles of oxide silicon is present in the ashes, having an S-value in the range from 8 to 50%, preferably from 10 to 40%, containing particles based on silica with a specific surface area in the range from 300 to 1000 m2/g, respectively, from 500 to 950 m2/g, and preferably from 750 to 950 m2/g, sols which can be modified as described above. S-value is measured and calculated as described Her & Dalton in J. Phys. Chem. 60(1956), 955-957. S-value indicates the degree of aggregation or formation of microgel, and a lower S-value indicates a higher degree of aggregation.

In yet another preferred embodiment of the invention the particles of oxide silicon have a high specific surface area, respectively, above about 1000 m2/g Specific surface area can be in the range from 1000 to 1700 m2/g and preferably from 1050 to 1600 m2/year

Additional examples of suitable polymers P2 include water soluble and dispersible in water anionic organic polymers produced by polymerization ethyleneamines anionic or potentially anionic monomer or preferably a mixture of monomers comprising one or more Ethylenediamine anionic or potential is real anionic monomers, and optionally one or more other Ethylenediamine monomers. Preferably Ethylenediamine monomers are soluble in water. Examples of suitable anionic or potentially anionic monomers include Ethylenediamine carboxylic acids and their salts, Ethylenediamine sulfonic acids and their salts, for example any of the above. The mixture of monomers may contain one or more water soluble Ethylenediamine nonionic monomers. Examples of suitable copolymerizing nonionic monomers include acrylamide and the above-mentioned nonionic monomers on the basis of acrylamide and acrylate and vinylamine. The mixture of monomers can also contain one or more water soluble Ethylenediamine cationic or potentially cationic monomers, preferably in small quantities. Examples of suitable copolymerizing cationic monomers include monomers represented by the above General structural formula (I) and guidami diallyldimethyl ammonium, for example the chloride diallyldimethyl ammonium. The mixture of monomers may also contain one or more multifunctional cross linking agents. The presence of a multifunctional cross linking agent in the mixture of monomers provides the possibility of preparation of polymer P2, which are dispersible in water. Examples of suitable multifunctional cross school is living agents include the above-mentioned multifunctional cross linking agents. These agents can be used in the above amounts. Examples of suitable dispersible in water organic anionic polymers include disclosed in U.S. patent No. 5167766, which is included in this description by reference. Examples of preferred copolymerizing monomers include (meth)acrylamide, and examples of preferred polymers P2 include water soluble and dispersible in water anionic polymers based on acrylamide.

The polymer P2, which is the anionic organic polymer according to the invention, preferably anionic organic polymer, soluble in water, has srednevekovoy molecular weight of at least about 500000. Usually srednevekovaja molecular weight is at least approximately 1 million, respectively, at least approximately 2 million and preferably at least approximately 5 million. The upper limit is not critical; it can be approximately 50 million, usually 30 million.

The polymer P2, which is the anionic organic polymer, may have a charge density of less than about 14 mEq/g, respectively, less than about 10 mEq/g, preferably less than about 4 mEq/g, Respectively, the charge density is in the range from approximately 1.0 to approximately 14,0, prefer the Ino from about 2.0 to about 10.0 mEq/g

In one implementation method of the present invention is a method of obtaining paper additionally includes adding polymer P1, which is the cationic polymer to the suspension after all points of high shearing forces.

Optional polymer P1 according to the present invention is a cationic polymer containing charge density, respectively, at least 2.5 mEq/g, preferably at least 3.0 mEq/g, Respectively, the charge density is in the range from 2.5 to 10.0, preferably from 3.0 to 8.5 mEq/g

Polymer P1 may be selected from inorganic and organic cationic polymers. Preferably the polymer P1 is soluble in water. Examples of suitable polymers include P1 connection polyamine, for example the chlorides of polyalanine, sulfates of polyalanine, connection polyalanine containing both ion, chloride and sulfate, sulfate silicate of polyamine and mixtures thereof.

Additional examples of suitable polymers P1 include cationic organic polymers, for example cationic polymers based on acrylamide; poly(halide of diallyldimethylammonium), including poly(chloride of diallyldimethylammonium); imine polyethylene; polyamidoamine; polyamine; and polymers based on vinylamine. Examples of suitable cationic organic polymers include polymers produced by by the imerissia soluble in water ethyleneamines cationic monomer or preferably a mixture of monomers, includes one or more water soluble Ethylenediamine cationic monomers and optionally one or more other water-soluble Ethylenediamine monomers. Examples of suitable water-soluble Ethylenediamine cationic monomers include halide of diallyldimethylammonium, for example the chloride of diallyldimethylammonium and cationic monomers represented by the General structural formula (II):

where R1is H or CH3; R2and R3each is H or preferably a hydrocarbon group, respectively, alkyl containing from 1 to 3 carbon atoms, preferably from 1 to 2 carbon atoms; A is O or NH; B is alkyl or alkilinity group containing from 2 to 8 carbon atoms, respectively, from 2 to 4 carbon atoms, or hydroxypropranolol group; R4is H or preferably a hydrocarbon group, respectively, alkyl containing from 1 to 4 carbon atoms, preferably from 1 to 2 carbon atoms, or Deputy containing aromatic group, respectively, phenyl or substituted phenyl group, which may be attached to the nitrogen through alkalinous group, typically containing 1 to 3 carbon atoms, respectively, from 1 to 2 carbon atoms, approaching the s R 4includes benzyl group (-CH2-C6H5); and X-is an anionic counterion, typically a halide like chloride.

Examples of suitable monomers represented by the General structural formula (II)include Quaternary monomers, obtained by processing dialkylaminoalkyl(meth)acrylates, including dimethylaminoethyl(meth)acrylate, diethylaminoethyl(meth)acrylate and dimethylaminopropyl(meth)acrylate and dialkylaminoalkyl(meth)acrylamides, including dimethylaminoethyl(meth)acrylamide, diethylaminoethyl(meth)acrylamide, dimethylaminopropyl(meth)acrylamide and diethylaminopropyl(meth)acrylamide, methyl chloride or benzylchloride. Preferred cationic monomers of the General formula (II) include Quaternary salt dimethylaminoethylacrylate of methyl chloride, the Quaternary salt dimethylaminoethylmethacrylate of methyl chloride, the Quaternary salt dimethylaminoethylacrylate benzylchloride and Quaternary salt dimethylaminoethylmethacrylate benzylchloride.

The mixture of monomers may contain one or more water soluble Ethylenediamine nonionic monomers. Examples of suitable copolymerizing nonionic monomers include acrylamide and monomers on the basis of acrylamide, such as methacrylamide, N-alkyl(meth)acrylamide, including N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-n-about the Il(meth)acrylamide, N-isopropyl(meth)acrylamide, N-n-butyl(meth)acrylamide, N-t-butyl(meth)acrylamide and N-isobutyl(meth)acrylamide; N-alkoxyalkyl(meth)acrylamide, for example N-n-butoxymethyl(meth)acrylamide, and N-isobutoxide(meth)acrylamide; N,N-dialkyl(meth)acrylamide, for example N,N-dimethyl(meth)acrylamide; dialkylaminoalkyl(meth)acrylamide; monomers, acrylate-based, as dialkylaminoalkyl(met)acrylates; and vinylamine. The mixture of monomers may also contain one or more water soluble Ethylenediamine anionic or potentially anionic monomers, preferably in small quantities. The term "potentially anionic monomer", as used herein, means including monomer carrying potentially an ionisable group that becomes an anionic after incorporation into the polymer applied to the pulp suspension. Examples of suitable copolymerizing anionic or potentially anionic monomers include Ethylenediamine carboxylic acids and their salts, for example (meth)acrylic acid and its salts, respectively, sodium(meth)acrylate, Ethylenediamine sulfonic acids and their salts, such as 2-acrylamide-2-methylpropanesulfonate, sulfoethyl-(meth)acrylate, vinylsulfonic acid and its salts, styrelseledamot and parafinovy phenol (hydroxytrol) and their salts. Examples of preferred copolymerizing monomial is the moat include acrylamide and methacrylamide, ie (meth)acrylamide, and examples of preferred cationic organic polymers include cationic polymer based on acrylamide, i.e. cationic polymer derived from a mixture of monomers comprising one or more monomers of acrylamide and acrylamide.

The polymer P1 in the form of a cationic organic polymer can have srednevekovoy molecular weight of at least 10000, often at least 50000. Often it is at least 100000 and usually at least around 500,000, respectively, at least approximately 1 million and preferably above about 2 million. The upper limit is not critical; it can be around 30 million, usually 20 million.

Examples of preferred auxiliary means for drainage and retention according to the invention include:

(i) a cationic polysaccharide, which is the cationic starch and the polymer P2, which is the anionic particles based on silica;

(ii) a cationic polysaccharide, which is the cationic starch and the polymer P2, which is soluble in water or dispersible in water anionic polymer based on acrylamide;

(iii) the polymer P1, which is a cationic polymer based on acrylamide, a cationic polysaccharide, which is the cationic starch and the polymer P2, which is the anionic particles of oxide silicon

(iv) polymer P1, which is the cationic compound of polyamine, cationic polysaccharide, which is the cationic starch and the polymer P2, which is the anionic particles based on silica;

(v) a polymer P1, which is a cationic polymer based on acrylamide, a cationic polysaccharide, which is the cationic starch and the polymer P2, which is soluble in water or dispersible in water anionic polymer based on acrylamide;

According to the present invention, a cationic polysaccharide, polymer P2 and, optionally, the polymer P1 is added to aqueous pulp suspension after it has passed through all the points of high mechanical shearing forces and to drainage. Examples of points of high shearing forces include pumping and purification stage. For example, included the following stages of shearing forces, in which the pulp suspension is passed through a mixing pumps, pressure sorters and centrifugal screens. Accordingly, the last point of high stress shift occurs in centrifugal noise and, therefore, cationic polysaccharide, polymer P2 and, optionally, the polymer P1, respectively, add sequentially in a centrifugal screen. Preferably after addition of the cationic polysaccharide polymer P2 and, optionally, polymer P1, the pulp suspension is served in the headbox, which select saweet slurry on the forming mesh for drainage.

It may be desirable for the optional inclusion of additional materials in the method according to the present invention. Preferably these materials are added to the pulp suspension before it flows across the last point of high shearing forces. Examples of such additional materials include water-soluble organic polymer coagulants, such as cationic polyamine, polyamidoamine, imine polyethylene, polymers condensation of dicyandiamide and low-molecular vysokoaktivnye vinyl additive polymers; and inorganic coagulants, such as aluminum compounds, such as alum and connection of polyalanine.

Cationic polysaccharide polymer P2 and, optionally, the polymer P1 may be separately added to the pulp suspension. In one method of implementation of the cationic polysaccharide is added to the pulp suspension prior to adding the polymer P2. In another method of implementation, the polymer P2 is added to the pulp suspension prior to adding the cationic polysaccharide. Preferably the cationic polysaccharide is added to the pulp suspension prior to adding the polymer P2. If applied polymer P1, then it can be added to the pulp suspension prior to, simultaneously with or after the cationic polysaccharide. Preferably the polymer P1 is added to the pulp suspension prior to or concurrent with cationic floor is a saccharide. Polymer P1 may be added to the pulp suspension before or after the polymer P2. Preferably the polymer P1 is added to the pulp suspension to the polymer P2.

Cationic polysaccharide polymer P2 and, optionally, the polymer P1, according to the invention can be added to the pulp slurry from which the water will be removed, in amounts which can vary within wide limits. In General, cationic polysaccharide, polymer P2 and, optionally, the polymer P1, is added in quantities which provide the best drainage and retention than is obtained without the introduction of additives.

Cationic polysaccharide is usually added in the amount of at least about 0,001% by weight, often at least about 0,005% by weight calculated as dry polymer on dry cellulosic suspension, and the upper limit is usually about 5.0 and about 2.0 and preferably about 1.5% by weight.

Similarly, the polymer P2 is usually added in the amount of at least about 0,001% by weight, often at least about 0,005% by weight calculated as dry polymer or dry SiO2on dry cellulosic suspension, and the upper limit is usually about 2.0 and about 1.5 percent by weight.

Similarly, the extension of the polymer P1, when applied, usually dobavlaut in number, at least approximately 0,001% by weight, often at least about 0,005% by weight calculated as dry polymer on dry cellulosic suspension, and the upper limit is usually about 2.0 and about 1.5 percent by weight.

The method according to the invention is applicable to all methods of paper production and pulp of the suspension, and it is particularly useful in the manufacture of paper from pulp, which has a high conductivity. In such cases, the conductivity of the mass, from which remove the water on the grid, usually at least about 1.5 MS/cm, preferably at least a 3.5 MS/cm and more preferably at least 5,0 MSM/see Conductivity can be measured using standard equipment, such as device WTW LF 539 shipped Christian Berner.

The present invention additionally encompasses methods of paper production, in which waste water is carefully processed, or recycled, i.e. with a high degree of closure of waste water, for example, in which from 0 to 30 tons of fresh water used per ton of dry made of paper, usually less than 20, preferably less than 15, more preferably less than 10 and especially less than 5 tons of fresh water per tonne of paper. Fresh water may be introduced into the method at any stage; for example, fresh water can be is mixed with the cellulose fibers for the formation of a pulp suspension, and fresh water can be mixed with a thick pulp suspension to dilute it so as to form a diluted pulp suspension, which is added to the cationic polysaccharide polymer P2 and, optionally, the polymer P1, after all points of high shearing forces.

The method according to the invention is used to obtain the paper. The term "paper"as used in this description, of course, includes not only paper and products from it, but also other wicker products, such as, for example, cardboard, paper and cardboard, and products made from them. The method can be used in obtaining paper from different types of suspensions of cellulose fibers, and the suspension should preferably contain at least 25% and more preferably at least 50% by weight of such fibers, based on dry matter. Suspension can be based on fibres from chemical pulp, such as sulphate and sulphite weight, thermo-mechanical pulp, chemo-thermomechanical pulp, organic mass, refined wood pulp or groundwood pulp as hardwood, soft wood, or fiber derived from annual plants such as elephant grass, bagasse, flax, straw, etc. and can also be used for suspensions based on recycled fibers. sabreena preferably applied to a method of making paper from a suspension with a content of wood pulp.

The suspension also contains mineral fillers of conventional types, such as, for example, kaolin, clay, titanium dioxide, gypsum, talc and both natural and synthetic calcium carbonates, such as chalk, crushed marble, ground calcium carbonate and precipitated calcium carbonate. Mass, of course, may also contain additives for paper production of conventional types, such as tools, giving strength in the wet state, a sizing agent, such as based on the resin, the ketene dimer, multimer of ketene, alkenyl succinic anhydrides, etc.

Preferably the invention is applied to the paper machines producing paper wood-containing pulp and paper based on recycled fibers, such as SC, LWC and various kinds of books and news papers, and to machines producing not containing wood pulp paper for printing and writing paper, the term "not containing mechanical pulp" means less than about 15% of fibres, containing wood pulp. Examples of preferred applications of the invention include obtaining paper and a layer of a multilayer paper from pulp suspensions containing at least 50% by weight mechanical and/or recycled fibers. Preferably the invention is applied to the paper machines producing at speeds from 300 to 3000 m/min and more preferably from 500 to 2500 m/min

The invention is additionally illustrated in the following examples, which, however, are not intended to limit them. Parts and % are parts by weight and % by weight, respectively, unless otherwise specified.

Examples

The following components were used in the examples:

C-PAMRepresenting the polymer P1. Cationic polymer based on acrylamide, prepared by polymerization of acrylamide (60 mol.%), and chloride Acrylonitrile ammonium (40 mol.%), the polymer having srednevekovoy molecular weight of approximately 3 million and cationic charge of approximately 3.3 mEq/g

C-PS 1:Cationic starch, modified chloride 2,3-hydroxypropyltrimethylammonium to the degree of cationic substitution (DSC) 0.05 and having a cationic charge density of approximately 0.3 mEq/g
C-PS 2:Cationic starch, modified chloride 2,3-hydroxypropyltrimethylammonium to the degree of cationic substitution (DSC) 0.11 and having a cationic charge density of approximately 0.6 mEq/g
Silicon dioxide/td> Representing the polymer P2. Anionic inorganic polymer condensation of silicic acid in the form of a colloidal Sol of silicon dioxide, modified aluminum, having an S-value of approximately 21 and containing particles based on silica with a specific surface area of approximately 800 m2/year
A-PAM:Representing the polymer P2. Anionic polymer based on acrylamide, prepared by polymerization of acrylamide (80 mol.%) and acrylic acid (20 mol.%), the polymer having srednevekovoy molecular weight of approximately 12 million and the density of anionic charge of about 2.6 mEq/g
A-X-PAM:Representing the polymer P2. Anionic transverse cross-linked polymer based on acrylamide, prepared by polymerization of acrylamide (30 mol.%) and acrylic acid (70 mol.%), the polymer having srednevekovoy molecular weight of approximately 100,000 and a density of anionic charge of approximately 8.0 mEq/g

Example 1

The effectiveness of drainage was estimated by the Dynamic Analyzer Drainage (DDA), available from Akribi, Sweden, which measures the time draining a certain amount of weight over the net when you remove the plugs and applications the AI vacuum to the side of the grid, opposite to the side on which is located the mass.

The retention efficiency was evaluated by turbidity meter, available from Novasina, Switzerland, by measuring the turbidity of the filtrate, the waste water produced by dewatering of the pulp. Turbidity measured in NTU Values (Units Turbidity).

The weight used in the test was based on 75% TMP and 25% DIP fiber material and bleaching water from a plant for the production of newsprint. The mass concentration was 0.76%. The conductivity mass amounted to 1.5 MS/cm, and pH was 7.1.

To play to make amendments after all points of high stress shear mass was stirred vessel with adjustable stirring. Mixing and additives were carried out according to the following:

(i) mixing at 1000 rpm for 25 seconds

(ii) mixing at 2000 rpm for 10 seconds

(iii) stirring at 1000 rpm for 15 seconds when introducing additives and

(iv) removing water from the mass with automatic registration of the duration of the removal of water.

The introduction of additives into the mass was performed in the following way: first the introduction of additives (rate additives 5, 10 or 15 kg/t) was performed for 25 or 15 seconds to remove water, and the second payment of a Supplement (the rate of the additive 5, 10 or 15 kg/t) was performed for 5 seconds-the Oia water.

Table 1 shows the effect of removing the water by introducing additives in different locations. Rules of adding cationic starch was calculated as dry on dry weight of the system and particles of oxide silicon was calculated as SiO2and based on the dry weight of the system.

Test No. 1 shows the result without making any additives. Test No. 2-6, 8, 10-14 and 16 illustrate the methods used for comparison (Reference), and Test No. 7, 9, 15 and 17 illustrate methods according to the invention.

Table 1
Use No.The first introduction of the additiveThe second payment of SupplementLong life & energy saving. make supplements [s] 1e/2eNorm
make supplements [kg/ton]
1e/2e
Long life & energy saving.
removal of water [with]
Turbidity [NTU]
1----to 85.2132
2C-PS 1Silicon dioxide 25/-10/-73,262
3C-PS 1Silicon dioxide15/-10/-of 54.861
4C-PS 1Silicon dioxide25/-15/-81,670
5C-PS 1Silicon dioxide15/-15/-57,157
6C-PS 1Silicon dioxide25/510/0,554,553
7C-PS 1Silicon dioxide15/510/0,546,461
8C-PS 1 Silicon dioxide25/515/0,5to 49.959
9C-PS 1Silicon dioxide15/515/0,538,262
10C-PS 2Silicon dioxide25/-5/-of 57.566
11C-PS 2Silicon dioxide15/-5/-51,761
12C-PS 2Silicon dioxide25/-10/-48,759
13C-PS 2Silicon dioxide15/-10/-36,652
14 C-PS 2Silicon dioxide25/55/0,552,961
15C-PS 2Silicon dioxide15/55/0,548,752
16C-PS 2Silicon dioxide25/510/0,528,343
17C-PS 2Silicon dioxide15/510/0,525,551

From table 1 it is obvious that the method according to the present invention has led to an improvement in the removal of water, at the same time, the retention rate has remained about the same.

Example 2

The effectiveness of drainage and retention was evaluated according to example 1.

The weight used in the test was based on 75% TMP and 25% DIP fiber material and bleaching water plant for the production of newsprint. The concentration of mass amounted to 0.78%. Prov is the need of the masses was 1.4 MS/cm, and pH was 7.8.

To play to make amendments after all points of high stress shear mass was stirred vessel with an adjustable mixing different speeds of the agitator. Mixing and introducing additives were carried out according to the following:

(v) mixing at 1500 rpm for 25 seconds

(vi) mixing at 2000 rpm for 10 seconds

(vii) mixing at 1500 rpm for 15 seconds when introducing additives according to the invention and

(viii) removal of water from automatic check-duration removal of water.

The introduction of additives into the mass was performed in the following way: first the introduction of additives was carried out for 25 or 15 seconds to remove water, and the second addition was performed for 5 seconds to remove the water.

The introduction of additives into the mass was performed as follows: first application of the additive (the rate of introduction of the additive 5 or 10 kg/t) was performed for 25 or 15 seconds to remove water, and the second payment of a Supplement (the rate of introduction of the additive is 0.1 kg/t) was performed for 5 seconds to remove the water.

Table 4 shows the effect of removing the water by introducing additives in different locations. The rate additives were calculated as dry on dry weight of the system.

Test No. 1 shows the result without making any additives. Tests # 2, 3, 4 and 6 and lusterous ways with the use of additives, applied for comparison (reference), and test No. 5 and 7 illustrate methods according to the invention.

Table 2
Use
No.
The first
the introduction of additives
The second
the introduction of additives
Long life & energy saving.
make supplements [s] 1e/2e
Norm
make supplements
[kg/t] 1e/2e
Long life & energy saving.
Removal of water [with]
Turbidity
[NTU]
1----85,3138
2C-PS 2-25/-10/-51,974
3C-PS 2-15/-10/-43,272
4C-PS 2 A-X-PAM25/510/0,134,658
5C-PS 2A-X-PAM15/510/0,133,355
6C-PS 2A-X-PAM25/55/0,157,283
7C-PS 2A-X-PAM15/55/0,148,772

From table 2 it is obvious that the method according to the present invention leads to improved water drainage and retention.

Example 3

The effectiveness of drainage and retention was evaluated according to example 1.

The weight used in the test was based on 75% TMP and 25% DIP fiber material and bleaching water from the plant is about the production of newsprint. The mass concentration was 0.61%. The conductivity mass amounted to 1.6 MS/cm, and pH 7.6.

To play to make amendments after all points of high stress shear mass was stirred vessel with controlled stirring at different speeds of the agitator. Mixing and introducing additives were carried out according to the following:

(ix) mixing at 1500 rpm for 25 seconds

(x) mixing at 2000 rpm for 10 seconds

(xi) mixing at 1500 rpm for 15 seconds when introducing additives according to the invention and

(xii) the removal of water from automatic check-duration removal of water.

The introduction of additives into the mass was performed as follows (rate additives in kg/t): additional polymer P1 was added for 45 and 15 seconds to remove water, a cationic polysaccharide was added in 25 and 10 seconds to remove water and the polymer P2 was added for 5 seconds to remove the water.

The introduction of additives into the mass was performed as follows: first application of the additive (the rate of introduction of the additive is 0.5 kg/t) was performed for 45 or 15 seconds to remove water, the second payment of a Supplement (the rate of introduction of the additive 5, 10 or 15 kg/t) was performed in 25 or 10 seconds to remove water and the third introduction of the additive (the rate of introduction of the additive 2 kg/t) was performed for 5 seconds to remove the water.

The table shows the effect of removing the water by introducing additives in different locations. The rate additives were calculated as dry on dry weight of the system and particles of oxide silicon was calculated as SiO2and based on the dry weight of the system.

Test No. 1 shows the result without making any additives. Tests # 2, 7, 9-11, 13-15 illustrate the methods used for comparison (reference), and test No. 8, 12 and 16 illustrate the methods according to the invention.

Table 3
Use
No.
The first
the introduction of additives
The second
the introduction of additives
Third, the introduction of additivesLong life & energy saving.
Making
supplements [with]
1e/2e/3e
Norm
Making
supplements
[kg/t]
1e/2e/3e
Long life & energy saving.
Removal of water [with]
Turbidity
[NTU]
1-----54,1134
2With-FRAMES- -15/-/-0,5/-/-41,180
3With-FRAMES-Silicon dioxide45/-/50,5/-/249,494
4With-FRAMES-Silicon dioxide15/-/50,5/-/243,297
5With-FRAMESC-PS 1Silicon dioxide45/25/50,5/5/228,576
6With-FRAMESC-PS 1Silicon dioxide45/10/50,5/5/224,878
7With-FRAMESC-PS 1The silicon dioxide is 15/25/50,5/5/226,275
8With-FRAMESC-PS 1Silicon dioxide15/10/50,5/5/220,873
9With-FRAMESC-PS 1Silicon dioxide45/25/50,5/10/218,572
10With-FRAMESC-PS 1Silicon dioxide45/10/50,5/10/2of 17.070
11With-FRAMESC-PS 1Silicon dioxide15/25/50,5/10/217,274
12With-FRAMESC-PS 1Duobus the silicon 15/10/50,5/10/215,465
13With-FRAMESC-PS 1Silicon dioxide45/25/50,5/15/217,973
14With-FRAMESC-PS 1Silicon dioxide45/10/50,5/15/216,669
15With-FRAMESC-PS 1Silicon dioxide15/25/50,5/15/215,373
16With-FRAMESC-PS 1Silicon dioxide15/10/50,5/15/215,163

From table 3 it is obvious that the method according to the present invention leads to improved water drainage and retention.

Example 4

The effectiveness of drainage and retention was evaluated according to example 2. Used the same weight and the sequence of mixing, as in example 2.

Making additives in mass was performed as follows: first application of the additive (the rate of introduction of the additive is 0.5 kg/t) was performed for 45 or 15 seconds to remove water, the second payment of a Supplement (the rate of introduction of the additive 5 kg/t) was performed in 25 or 10 seconds to remove water, and the third introduction of the additive (the rate of introduction of the additive 2 kg/t) was performed for 5 seconds to remove the water.

Table 2 shows the effect of removing the water by introducing additives in different locations. The rate additives was calculated as dry on dry weight of the system and particles of oxide silicon was calculated as SiO2and based on the dry weight of the system.

Test No. 1 shows the result without making any additives. Test No. 2-4 illustrate the methods used for comparison (Reference), and Test # 5 illustrates the method according to the invention.

Table 4
Use
No.
The first introduction of the additiveThe second payment of SupplementThird, the introduction of additives Long life & energy saving. Make supplements [with]
1e/2e/3e
Rate
supplements
[kg/t]
1e/2e/3e
Long life & energy saving. removal of water [with]Turbidity [NTU]
1-----54,1134
2With-PAMC-PS 2Silicon dioxide45/25/50,5/5/214,975
3C-PAMC-PS 2Silicon dioxide45/10/50,5/5/214,566
4C-PAMC-PS 2Silicon dioxide15/25/50,5/5/2the 17.373
5 C-PAMC-PS 2Silicon dioxide15/10/50,5/5/213,564

From table 4 it is evident that the method according to the present invention leads to improved water drainage and retention.

Example 5

The effectiveness of drainage and retention was evaluated according to example 1. Used the same weight and the sequence of mixing, as in example 2.

Make supplements in the mass were performed as follows: first, the polymer is made 45 or 15 seconds to remove water, the second polymer is made for 25 or 10 seconds to remove water, and the third polymer is made for 5 seconds to remove the water.

Making additives in mass was performed as follows: first application of the additive (the rate of introduction of the additive is 0.5 kg/t) was performed for 45 or 15 seconds to remove water, the second payment of a Supplement (the rate of introduction of the additive 10 kg/t) was performed in 25 or 10 seconds to remove water, and the third introduction of the additive (the rate of introduction of the additive is 0.5+0.1 kg/t or 0.1 kg/t) was performed for 5 seconds to remove the water.

The weight used in the test was based on 75% TMP and 25% DIP fiber material and bleaching water plant for the production of newsprint. The concentration of mass amounted to 0.78%. Conductivity mA the son was 1.4 MS/cm, and pH was 7.8.

Table 3 shows the effect of removing the water by introducing additives in different locations. The rate additives was calculated as dry on dry weight of the system and particles of oxide silicon was calculated as SiO2and based on the dry weight of the system.

Test No. 1 shows the result without making any additives. Tests 2,3,4 and 6-8 illustrate the methods used for comparison (reference), and test No. 5 and 9 illustrate methods according to the invention.

Table 5
Use
No.
The first introduction of the additiveThe second payment of SupplementThird, the introduction of additivesLong life & energy saving.
make supplements [with]
1e/2e/3e
Rule making supplements [kg/ton]
1e/2e/3e
Long life & energy saving. removal of water [with]Turbidity [NTU]
1-----85,3138
2With-PAMC-PS 2Silica+
A-PAM
45/25/50,5/10/
0,5+0,1
to 19.933
3With-PAMC-PS 2Silica+
A-PAM
45/10/50,5/10/
0,5+0,1
18,537
4With-PAMC-PS 2Silica+
A-PAM
15/25/50,5/10/
0,5+0,1
15,143
5With-PAMC-PS 2Silica+
A-PAM
15/10/50,5/10/
0,5+0,1
13,638
6With-PAMC-PS 2A-X-PAM45/25/50,5/10/0,130,649
7With-PAMC-PS 2A-X-PAM45/10/50,5/10/0,124,846
8With-PAMC-PS 2A-X-PAM15/25/50,5/10/0,125,656
9With-PAMC-PS 2A-X-PAM15/10/50,5/10/0,122,643

From table 5 it is evident that the method according to the present invention leads to improved removal of water, at the same time, the retention index remains approximately the same.

1. The method of producing paper, including:
(i) providing a water suspension comprising cellulose fibres,
(ii) adding to the suspension after all points of high shearing forces:
polymer P1, which represents a cationic polymer, soluble in water;
cationic polysaccharide; and
polymer P2, which is an anionic polymer; and
(iii) removing water from the resulting suspension for fo is mounia paper.

2. The method according to claim 1, where the obtained suspension is served in the headbox, which throws out the suspension on a forming mesh for drainage for the formation of paper.

3. The method according to any one of claims 1 and 2, where the point of high shearing forces include the stage of pumping and cleaning.

4. The method according to claim 3, where the stage of pumping and purification include mixing pumps, pressure sorters and centrifugal screens.

5. The method according to claim 1, where the last point of high shearing forces is carried out in a centrifugal crash.

6. The method according to claim 1 where the cationic polysaccharide is a cationic starch.

7. The method according to claim 1, where the degree of substitution (DSC) cationic polysaccharide is within the range of 0.005 to 1.0.

8. The method according to claim 1 where the cationic polysaccharide is a cationic charge density within the range from 0.05 to 6.0 mEq/g

9. The method according to claim 1 where the cationic polysaccharide has a molecular weight of more than 500,000.

10. The method according to claim 1, where the polymer P2 is an inorganic polymer.

11. The method according to any one of claims 1 or 10, where the polymer P2 is silicic acid or polymer-based silicate.

12. The method according to any one of claims 1 or 10, where the polymer P2 includes colloidal particles based on silica.

13. The method according to claim 1, where the polymer P2 is an organic polymer.

14. The method according to any one of claims 1 or 13, where the polymer P2 is poly the EP on the basis of acrylamide.

15. The method according to claim 1, where the polymer P1 is an organic polymer.

16. The method according to any one of claims 1 or 15, where the polymer P1 is a cationic polymer based on acrylamide.

17. The method according to any one of claims 1 or 15, where the polymer P1 has srednevekovoy molecular weight of at least 500000.

18. The method according to claim 1, where the polymer P1 is an inorganic polymer.

19. The method according to p, where the polymer P1 is the chloride of polyalanine.

20. The method of producing paper, including:
(i) providing a water suspension comprising cellulose fibres,
(ii) adding to the suspension after all points of high shearing forces auxiliary means for drainage and retention, consisting of:
cationic polysaccharide; and
polymer P2, which is an anionic polymer; and
(iii) removing water from the resulting suspension to form paper.

21. The method according to claim 20, where the resulting suspension is served in the headbox, which throws out the suspension on a forming mesh for drainage for the formation of paper.

22. The method according to any of PP and 21, where the point of high shearing forces include the stage of pumping and cleaning.

23. The method according to item 22, where the stage of pumping and purification include mixing pumps, pressure sorters and centrifugal screens.

24. The method according to claim 20, where the last point of high shearing forces is carried out in a centrifugal crash.

25. the procedure according to claim 20, where the cationic polysaccharide is a cationic starch.

26. The method according to claim 20, where the degree of substitution (DSC) cationic polysaccharide is within the range of 0.005 to 1.0.

27. The method according to claim 20, where the cationic polysaccharide is a cationic charge density within the range from 0.05 to 6.0 mEq/g

28. The method according to claim 20, where the cationic polysaccharide has a molecular weight of more than 500,000.

29. The method according to claim 20, where the polymer P2 is an inorganic polymer.

30. The method according to any of PP or 29 where the polymer P2 is silicic acid or polymer-based silicate.

31. The method according to any of PP or 29 where the polymer P2 includes colloidal particles based on silica.

32. The method according to claim 20, where the polymer P2 is an organic polymer.

33. The method according to any of PP or 32, where the polymer P2 is a polymer based on acrylamide.

34. The method according to claim 20, where additional material is added to the suspension prior to its passage through the last point of high shearing forces, and additional materials selected from the group comprising cationic polyamine, polyamidoamine, immini polyethylene, polymers condensation of dicyandiamide, low-molecular vysokoaktivnye vinyl additive polymers, alum, join polyaluminum.



 

Same patents:

The invention relates to the production of paper and can be used in the pulp and paper industry (PPI) for securities in a neutral environment on the basis of wood pulp and wood chemical thermomechanical pulp (CTMP), for example offset printing paper and newsprint paper for printing Newspapers and high offset printing methods

FIELD: textile; paper.

SUBSTANCE: method (in version) concerns paper manufacturing and can be applied in pulp and paper industry. Method involves: (i) supply of water suspension containing pulp fiber, (ii) adding to suspension after the last point of severe shear force exposure of: (a) first anion component of anion organic polymer soluble in water; (b) second anion component of anion organic polymer dispersed in water or branched organic polymer; and (c) third anion component of anion material containing silicon; and (iii) dehydration of obtained suspension to produce paper. Also invention concerns composition (in version) including first, second and third anion components, and application of the composition as flocculation agent in production of pulp mass and paper for water treatment.

EFFECT: improved water drainage and retaining during paper manufacturing out of any type of pulp suspensions, accelerated operation of paper-making machine, reduced polymer dosage applied.

56 cl, 3 tbl, 4 ex

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

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.

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

24 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

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: textile; paper.

SUBSTANCE: method (in version) concerns paper manufacturing and can be applied in pulp and paper industry. Method involves: (i) supply of water suspension containing pulp fiber, (ii) adding to suspension after the last point of severe shear force exposure of: (a) first anion component of anion organic polymer soluble in water; (b) second anion component of anion organic polymer dispersed in water or branched organic polymer; and (c) third anion component of anion material containing silicon; and (iii) dehydration of obtained suspension to produce paper. Also invention concerns composition (in version) including first, second and third anion components, and application of the composition as flocculation agent in production of pulp mass and paper for water treatment.

EFFECT: improved water drainage and retaining during paper manufacturing out of any type of pulp suspensions, accelerated operation of paper-making machine, reduced polymer dosage applied.

56 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

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: production of paper and paper products in pulp-and-paper industry.

SUBSTANCE: method involves adding effective amounts of at least one cation-active polymer coagulant or inorganic coagulant with following adding of material consisting of microparticles, wherein pulp contains cellulose produced at least partly from processed paper products. Coagulant used is of natural or synthetic origin. Material based on microparticles is, for example, bentonite clay, network polymer, colloidal silicon, or polysilicate.

EFFECT: increased efficiency in reducing of white resin sedimentation.

17 cl, 2 dwg, 2 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: paper industry.

SUBSTANCE: aqueous composition includes 0.01 to 45 % by weight of anionic organic polymeric particles and silica-based colloidal anionic particles at weight ratio between them from 20:1 to 1:50. Silica-based colloidal anionic particles are prepared by modifying silica with aluminum or amine. Anionic organic polymeric particles are prepared by polymerization of ethylenically-unsaturated monomers with multifunctional ramification agents and/or multifunctional cross-linking agents. Composition is prepared by combining the two types of particles. Papermaking method comprises adding above-prepared composition to pulp composed of cationic polymer fibers.

EFFECT: imp drying and retention properties of aqueous composition.

16 cl, 4 tbl, 4 ex

FIELD: paper and cardboard production in pulp-and-paper industry.

SUBSTANCE: method involves preparing cellulose suspension; flocculating and draining suspension on net for producing of paper web; drying paper web. Flocculation process is initially performed with the use of cation-active material, such as natural or synthetic polymer, followed by flocculation with the use of flocculant system including silicon-containing material and organic microparticles having diameter less than 750 nm in unswelled state.

EFFECT: improved draining, holding and forming process.

28 cl, 3 dwg, 12 tbl, 3 ex

FIELD: production of improved starch compositions and methods of use of improved starch compositions.

SUBSTANCE: proposed method includes use of starch component containing cationized cross-linked starch at viscosity of from 10 to 3000 cps. Production of paper includes the following stages: boiling the starch component at temperature of 165°C, dehydration of paper composition (paper fibers, inorganic filler, starch) and control of rate of dehydration and/or holding the first pass in the course of dehydration through change in temperature (by at least 10°C) of starch composition boiling.

EFFECT: possibility of performing modifications in accordance with variants on wet end of paper machine.

21 cl, 6 dwg, 2 tbl

Sizing emulsion // 2223355
The invention relates to aqueous sizing emulsions and more particularly to the emulsions containing a substituted succinic anhydride as a sizing agent, usually referred to as ASA, positively charged particles are cationic colloidal silicon dioxide, positively charged colloidal particles of aluminum oxide or positively charged colloidal particles of zirconium dioxide
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