Paper sizing

FIELD: textile, paper.

SUBSTANCE: invention relates to a water dispersion (its version) of a cellulose-active gluing substance (its version), a method to produce the water dispersion (its version), application of the water dispersion and a method of paper making. The water dispersion of the cellulose-active gluing substance contains an acid anhydride, an anion polyelectrolyte and a nitrogen-containing organic compound, which is an amine or a corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The method to produce the water dispersion of the cellulose-active gluing substance and its version includes dispersion of the acid anhydride in the water phase in presence of the anion polyelectrolyte and the nitrogen-containing organic compound, which is the amine or the corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The above specified water dispersions of the cellulose-active gluing substance may be used for sizing in mass or for surface sizing in paper making. The method of paper making includes addition of the above-specified water dispersions of the cellulose-active gluing substance to the water suspension of cellulose with subsequent dehydration of the produced suspension on a net of a paper-making machine or by application of these dispersions onto a surface of a cellulose sheet.

EFFECT: improved stability of the gluing water dispersion and efficiency of sizing, energy and capital cost saving.

41 cl, 13 tbl, 7 ex

 

The scope of the invention

The present invention relates to the sizing of paper, and more particularly to aqueous dispersions of pulp and active sizing agent and to their preparation and application.

Prerequisites to the creation of inventions

Pulp-active sizing agent, such as those based on alkenyl-succinic anhydride (ASA), widely used in paper production at neutral or slightly alkaline pH of pulp for making paper or paperboard some degree of resistance to wetting or penetration of aqueous liquids. Paper based adhesives pulp and active sizing substances usually provided in the form of a dispersion containing an aqueous phase and a dispersed solid particles or droplets sizing agent dispersed therein. The dispersion is usually obtained by using a dispersant system consisting of anionic compounds, such as sodium lignosulphonate in combination with high molecular weight amphoteric or cationic polymer such as cationic starch, polyamines, polyamidoamine or vinyl polymer obtained stepwise polymerization.

In international patent application WO 96/17127 describes aqueous dispersions that contain pulp and active sizing agent and the colloidal particles and the ionic silica, modified aluminum.

In international patent application WO 97/31152 describes aqueous dispersions which contain reactive adhesive and anionic microselectron substance. In addition, the dispersion can contain no more than 2% (by weight reactive adhesive) surface-active substances. Surfactant can be nonionic or anionic.

In international patent application WO 98/33979 A1 describes aqueous dispersion of pulp and active sizing agent and dispersant containing cationic organic compound and an anionic stabilizer.

Although signicant improvements have been achieved in obtaining, properties and working characteristics of aqueous dispersions Genil-succinic anhydride, there are some technical problems associated with the use of such dispersions. Dispersion of alkenyl-succinic anhydride usually show poor stability, which undoubtedly leads to difficulties in the handling of these dispersions, for example, during storage and use. One additional disadvantage is that the water dispersion cannot be stored for longer periods of time because of alkenyl-succinic anhydride easily hydrolyzed and thus becomes ineffective as a sizing agent.

With edutella, alkenyl-succinic anhydride is usually put on paper mill in the form of a liquid, which then is dispersed to its use as a sizing agent, the obtained dispersion is usually used within 2 hours to avoid problems associated with lack of stability and loss of efficiency sizing. The equipment used to obtain dispersions, provides large shear forces to be able to leave the free surface and to produce a dispersion having an appropriate particle size. Such equipment is often both complex and costly, and due to the large shear forces typically require a significant amount of energy.

The present invention is the creation of a water dispersion of pulp and active sizing agent, which can easily be prepared using small shear forces and small energy consumption. An additional objective of this invention is to provide a water dispersion of pulp and active sizing agent, showing improved stability and efficiency sizing. Additional tasks will be apparent hereinafter.

Summary of the invention

The invention relates to a water dispersion of pulp and active sizing agent containing the first acid anhydride, anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium base having a molecular weight of less than 180 and/or having one or more hydroxyl groups.

The invention additionally relates to a method for obtaining a water dispersion of pulp and active sizing agent, which includes the dispersion of the acid anhydride in the aqueous phase in the presence of an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium base having a molecular weight of less than 180 and/or having one or more hydroxyl groups.

In addition, the invention relates to the use of aqueous dispersion of pulp and active sizing agent as a substance for gluing in the mass or substance for surface sizing in the manufacture of paper. The invention additionally relates to a method for production of paper which contains the addition of an aqueous dispersion of pulp and active sizing agent to the aqueous suspension of cellulose and dewatering the obtained suspension on the grid paper machine, and to a method of manufacturing paper, which contains the application of the aqueous dispersion of pulp and active proKLIMA is the pollutant specific to the canvas pulp.

Detailed description of the invention

As installed, according to the present invention can achieve improved sizing of paper using this aqueous dispersion of pulp and active sizing agent. As well as installed, these dispersions show better stability compared with conventional dispersions. In addition, as installed, to obtain aqueous dispersions it is possible to use a smaller shear forces compared to those that occur when receiving conventional aqueous dispersions of pulp and active sizing agent. Thanks to the present invention, it becomes possible to use simple equipment, saving energy and capital costs and creating a small shear forces, such as static mixers. Thus, the present invention provides significant economic and technical benefits.

Pulp-active sizing substance according to the invention can be selected from any sizing agent based on the anhydride acid known from the prior art. A suitable wetting agent is a hydrophobic acid anhydride. Suitable hydrophobic anhydrides of acids may be characterized by the following General formula (I)in which R1and R2are independently selected and from saturated or unsaturated hydrocarbon groups, which suitably contain from 8 to 30 carbon atoms, or R1and R2together with part-C-O-C - can form a ring of 5-6 items, optionally additionally substituted hydrocarbon groups containing up to 30 carbon atoms:

Examples of suitable acid anhydrides include alkyl - and alkenyl-succinic anhydrides, such as ISO-octadecenyl-succinic anhydride, ISO-octadecyl-succinic anhydride, n-hexadecanyl-succinic anhydride, dodecenyl-succinic anhydride, decenyl-succinic anhydride, octenyl-succinic anhydride, three-isobutyl-succinic anhydride, 1-octyl-2-decenyl-succinic anhydride and 1-hexyl-2-octenyl-succinic anhydride. Examples of suitable anhydrides of the acids further includes the compounds described in U.S. patent No. 3102064, 3821069, 3968005, 4040900 and 4522686; and Re. 29960 listed here as a reference.

Pulp-active sizing substance according to the invention may contain one or more acid anhydrides, for example, one or more alkyl and/or alkenyl-succinic anhydrides. Typically, the acid anhydride according to this invention is liquid at room temperature.

The dispersion according to the invention contains a dispersant or dispersant containing anionic polyelectrolyte and a nitrogen-containing organic the definition connection. When combined, these compounds are effective as a dispersant for a sizing agent based on the anhydride of the acid, although when used alone anionic polyelectrolyte and a nitrogen-containing organic compound may not be effective as a dispersant. The dispersion preferably is anionic, i.e. dispersant or dispersant system have a common anionic charge.

Anionic polyelectrolyte according to the invention may be selected from organic and inorganic compounds and can be obtained from natural or artificial sources. Anionic, polyelectrolyte has two or more anionic groups, which may be the same or different species. Examples of suitable anionic groups, i.e. groups that are anionic or anionic in aqueous phase comprises silanol combined with caffeine, silicate, phosphate, phosphonate, sulfate, sulfonate, sulfonic group and a carboxylic acid, and their salts, usually ammonium salts or alkali metal (usually sodium). Anionic polyelectrolytes can be soluble in water, for example, linear and branched anionic polyelectrolytes or dispersible in water, for example, sewn and/or dispersible anionic polyelectrolytes. Dispersible in water and dispersion of anionic polyelectrolyte the s are preferably colloidal, i.e. have a particle size in the colloidal range. Colloidal particles suitably have a size of from 1 nm to 100 nm, preferably from 2 to 70 nm, and most preferably from 2 to 40 nm. Dispersible in water and dispersed anionic polyelectrolytes may contain aggregated and/or non-aggregated particles.

Examples of suitable anionic organic polyelectrolytes are anionic polysaccharides, namely starch, guar gum, cellulose, chitin, chitosan, glycan, galactan, glucan, xanthan gum, mannan, and dextrin. Additional examples of suitable anionic organic polyelectrolytes are synthetic anionic polymers, such as, for example, condensation polymers, for example, polyurethane and polymers based on naphthalene and melamine, for example, condensation formaldehydeinduced and polymers based on malminkartano acid, and vinyl polymers obtained stepwise polymerization of ethyleneimine monomers, including anionic or potentially anionic monomers, such as acrylic acid, methacrylic acid, maleic acid, taconova acid, crotonic acid, vinylsulfonic acid, from sulphonated styrene and phosphates hydroxyethylacrylate and methacrylates, optionally copolymerizable with nonionic Ethylenediamine monomers, e.g. the R acrylamido, alkylacrylate, styrene and Acrylonitrile, and derivatives of such monomers, vinyl esters, etc.

Examples of other suitable organic non-ionic polyelectrolytes are water-soluble branched polymers and dispersible in water crosslinked polymers obtained by polymerization of a mixture of monomers containing one or more Ethylenediamine anionic or potentially anionic monomers and, optionally, one or more other Ethylenediamine monomers, in the presence of one or more polyfunctional crosslinking agents. The presence of a polyfunctional cross-linking agent in the mixture of monomers makes it possible for branched polymers, weakly cross-linked polymers and highly cross-linked polymers which are dispersible in water. Examples of suitable polyfunctional cross-linking agents are compounds having at least two Ethylenediamine communication, for example N,N-methylene-bis(meth)acrylamide, polietilenglikoli(meth)acrylate, N-vinyl(meth)acrylamide, divinylbenzene, salts of triallylamine and N-methylallyl(meth)acrylamide; compounds having Ethylenediamine bond and a reactive group, such as glycidyl(meth)acrylate, acrolein and methylol(meth)acrylamide; and compounds having at least two reactive groups, for example dihalide the IDA, such as glyoxal, diepoxybutane and epichlorohydrin.

Organic anionic polyelectrolyte has a degree of anionic substitution (DSA) is usually from 0.01 to 1.4, suitably from 0.1 to 1.2 and preferably from 0.2 to 1.0. Anionic polyelectrolyte may contain one or more cationic groups, because it has an overall anionic charge. Molecular weight anionic polyelectrolyte may vary within wide limits; the molecular weight is typically over 200 and eligible over 500, while the upper limit is usually 10 million and preferably 2 million.

Examples of suitable inorganic anionic polyelectrolytes are anionic siliceous materials, such as anionic materials based on silica, obtained with the use of silicic acid, and clay smectites type. These anionic polyelectrolytes are usually negative silanol, aluminosilicate or a hydroxyl group. Examples of suitable inorganic anionic polyelectrolytes are poly acid, polysilicate, polyaluminosilicate, colloidal particles of silica, such as silica particles, aluminized (modified aluminium silica and aluminum silicate, polysilicate microgels, the microgels of polyaluminosilicate, gels of silica and precipitated silica, smectite gli is s, for example, montmorillonite, bentonite, hectorite, Badelt, nontronite and saponite. Among the preferred anionic polyelectrolytes include materials based on silica, such as colloidal particles based on silica.

Nitrogen-containing organic compound according to the invention is an amine or the corresponding Quaternary ammonium base. In a number of suitable nitrogen-containing organic compounds include primary, secondary and tertiary amines and their corresponding Quaternary ammonium base. In a number of suitable nitrogen-containing organic compounds optionally include monoamines, diamines, and polyamine and their corresponding Quaternary ammonium base. In a number of suitable ammonium bases are protonated, alkylated, allrounda and alkalicarbonate amines of the above-mentioned type, which can be formed by reaction of amines with, for example, acids, such as hydrochloric acid, and methyl chloride, dimethylsulfate and benzylchloride. In a preferred variant of the invention, the nitrogen-containing organic compound is amine or the corresponding Quaternary ammonium base having one or more hydroxyl groups. One or more hydroxyl groups is preferably present in an extreme state is one or more substituents nitrogen-containing compounds, i.e. ending with a hydroxyl group, amine or the corresponding Quaternary ammonium base.

Examples of suitable nitrogen-containing organic compounds are amines and their corresponding Quaternary ammonium base: Diethylenetriamine, Triethylenetetramine, hexamethylenediamine were, diethylamin, dipropylamine, di-Isopropylamine, cyclohexylamine, pyrrolidine, guanidine, triethanolamine, monoethanolamine, diethanolamine, 2-methoxyethylamine, aminoethylethanolamine, alanine and lysine. Additional examples of suitable nitrogen-containing organic compounds are choline hydroxide, a hydroxide of Tetramethylammonium and hydroxide of tetraethylammonium. In a preferred nitrogen-containing organic compounds include triethanolamine and the corresponding Quaternary ammonium base.

Molecular weight nitrogen-containing organic compounds may vary within wide limits. In a preferred embodiment of the invention the molecular weight of the amine or the corresponding Quaternary ammonium base is less than 180, suitably up to 170 and preferably up to 160. Molecular weight of usually equal to at least 30. This molecular weight Quaternary ammonium base amine mean molecular mass of the spacecraft is the ionic part of the Quaternary ammonium compound and means, what anionic part of Quaternary ammonium compounds not included in the above values of molecular weight. For nitrogen-containing organic compounds which are selected from amines and their Quaternary ammonium bases having one or more hydroxyl groups, the values of molecular weight can be higher, for example up to 500 and typically up to 300, although the above values of molecular weight are also suitable for such compounds.

In this aqueous dispersion or emulsion of the acid anhydride may be present in an amount of from about 0.1 to about 50 wt.%, suitably from 0.1 to about 30 wt.% and preferably from about 1 to about 20 wt.% based on the weight of aqueous dispersion. Anionic polyelectrolyte is present in the amount of up to about 100 wt.%, usually from 0.1 to 15 wt.%, suitably from 0.5 to 10 wt.% and preferably from 1 to 7 wt.% based on the weight of the acid anhydride. Nitrogen-containing organic compound may be present in amounts up to 20 wt.%, usually from 0.1 to 15 wt.%, suitably from 0.5 to 10 wt.% and preferably from 1 to 7 wt.% based on the weight of the acid anhydride. In addition to the anhydride of the acid of the anionic polyelectrolyte and a nitrogen-containing organic compound in the dispersion can have an optional additional compounds. Examples of such soy is ineni are mono-, di - and polyanionic and non-ionic surfactants and dispersing agents, stabilizers, fillers and preservatives, such as, for example, hydrolyzed acid anhydrides, for example the above-mentioned hydrolyzed alkalemia and alkenilovyh anhydrides of the acids, preferably hydrolyzed alkenyl-succinic anhydrides, for example hydrolyzed anhydrides of the acids in the form of derivatives of carboxylic acids and/or ether carboxylic acids, anionic surfactants such as esters of phosphoric acid, as for example, ethoxylated esters of phosphoric acid, alkalemia sulfates, sulfonates and phosphates, alkylsilane sulfates, sulfonates and phosphates, for example laurylsulphate sodium and ethoxylated, phosphated isotridecanol the alcohol. In case of their presence, the content of such additional compounds in the dispersion may be from 0.1 to 15 wt.%, suitably from 1 to 10 wt.% and preferably from 2 to 7 wt.% based on the weight of the acid anhydride. Water is also present in the dispersion and may constitute the remainder of the dispersion up to 100 wt.%.

The dispersion according to the invention can be obtained by forming a mixture containing the acid anhydride, anionic polyelectrolyte and a nitrogen-containing organic compound, as defined above, and dispersive mixture in the presence of water. Components of variance can be smiling the s in any order, but preferably mixed anionic polyelectrolyte and a nitrogen-containing organic compound and dilute them with water to the appropriate concentration, and then dispersed in them anhydride acid. The mixture can be atomized using the right equipment for dispersion, providing a sufficient degree of dispersion, for example a static mixer, which creates a relatively small shear forces. The resulting dispersion contains drops of acid anhydride, typically having a diameter of from 0.1 to 10 microns.

The aqueous sizing dispersion according to the invention can be used in the usual manner in the production of paper using pulp fibers of any kind, and these aqueous sizing dispersion can be used for surface sizing and sizing in mass. Used herein, the term "paper" includes not only paper, but also all kinds of cellulosic materials in the form of a sheet or fabric, including, for example, paper, cardboard. In addition, the suspension of pulp and finished paper may contain mineral fillers, the content of cellulose fibers is typically at least 50 wt.% calculated on the dry weight of the substance suspension of cellulose or the weight of the finished paper. Examples of mineral fillers of conventional types are kaolin, titanium dioxide is, gypsum, talc and natural or synthetic calcium carbonates, such as chalk, ground marble and precipitated calcium carbonate. The present invention also relates to a method for production of paper, which considered the aqueous sizing dispersion or added to aqueous suspensions of pulp or applied to the sheet or webs of cellulose. The number of pulp and active sizing agent, which is either added to the pulp suspension to be dewatered on the grid paper machine for forming paper or as a surface adhesive applied to the surface of the sheet or webs of cellulose - usually in the sizing press is suitably ranges from 0.01 to 1.0 wt.%, preferably from 0.05 to 0.5 wt.% calculated on the dry weight of the substance suspension of cellulose and optional fibers, and this number depends mainly on the number of create more gluing of pulp and paper and the desired degree of sizing.

The aqueous sizing dispersion according to the invention is particularly useful in obtaining paper from an aqueous suspension of cellulose, which has a high conductivity. The conductivity of the suspension, which dehydrate on the grid paper machine may be in the range of 0.3 MS/cm to 10 MS/see According to this invention, good results can be achieved is by conduction, at least a 2.0 MS/cm; they can be achieved noticeable when at least a 3.5 MS/cm, especially when, at least to 5.0 MS/cm, and even when at least 7,5 MSM/see Conductivity can be measured on standard equipment, as for example, the device WTW LF 330 shipped from Christian Berner. The above values determine the appropriate way, by measuring the conductivity of a suspension of cellulose, which is served in the headbox of the paper machine or which is in him, or, on the other hand, measuring the conductivity of the circulating water resulting from dewatering of the suspension. High values of conductivity mean high content of salts (electrolytes), which can be extracted from the materials used for the formation of a fibrous mass of various additives introduced into the fiber, fresh water supplied into the process, etc. in Addition, the salt content is usually higher during intensive recirculation of cooling water, which can lead to significant accumulation of salts in the water recirculated in the process.

In connection with the present invention can of course be used with chemical substances usually added to a suspension of cellulose in the manufacture of paper, as for example, substances for improving uderzhivaemoi filler, aluminum is operasie connection dyes, resins for making the paper wet strength, optical brighteners, etc. Examples of aluminium-containing compounds include alum, aluminates and polyaluminosilicate connection, for example the semi-aluminum chlorides and sulfates. Examples of suitable substances for increasing uderzhivaemoi filler are cationic polymers, anionic inorganic materials in combination with organic polymers, such as bentonite in combination with cationic polymers, sols based on silica in combination with polymers or cationic and anionic polymers. Especially good bonding can be achieved using the dispersion according to the invention in combination with substances to improve uderzhivaemoi filler containing cationic polymers. In a number of suitable cationic polymers include cationic starch, polymers based on acrylate and acrylamide, polyethylenimine, polyamine, polyaminoamide and poly(diallyldimethylammoniumchloride) and their combinations. In a preferred substances to improve uderzhivaemoi filler comprises cationic starch and cationic polymers based on acrylamide. In a preferred embodiment of the invention dispersion is used in combination with substances to improve uderzhivaemoi filler containing at least one AC is an ionic polymer and anionic siliceous material, for example, particles based on silica or bentonite. Possible pre-mixing of one or more components of the considered dispersion with a substance to improve uderzhivaemoi filler, for example, anionic siliceous material before the introduction of the thus obtained mixture in a suspension of cellulose. Therefore this aqueous sizing dispersion can be prepared immediately prior to its entering into suspension of cellulose, resulting anhydride acid and nitrogen-containing organic compound into contact with an anionic polyelectrolyte, such as water siliceous material, such as a Sol based on silica or bentonite suspension.

Hereinafter the invention will be illustrated by the following examples, which, however, does not aim to limit the invention. Parts and percentages specified respectively in parts and weight%, unless otherwise requested.

Example 1

Aqueous dispersions according to the invention received in a tubular static mixer Hash, dispersive of alkenyl-succinic anhydride (ASA) - based olefin fraction containing ISO-hexadecanyl - or ISO-octadecenyl-succinic anhydride, in the presence of a mixture of anionic polyelectrolyte and an amine.

Water dispersion used for comparison in this and the following examples were prepared in a similar manner, for which the conclusion of the addition, not used any of Amin and no colloidal silica, and high molecular weight amines and/or amine had no hydroxyl groups.

Anionic polyelectrolyte used in this example was colloidal silica (Eka NR 590) in the form of an aqueous Sol having a content of SiO2equal to 8.1 wt.%, and containing silica particles with a specific surface area equal to 850 m2/G, which has been modified by aluminum. The amine used in this example was the triethanolamine (TEA) with a molecular mass equal to 149.

Anionic polyelectrolyte and amine were mixed in the presence of water for the formation of the mixture, which was pumped into one end of the tube at a flow rate 3,17 l/min, with concentrated ASA was added to the side of the pipe when the flow 0,167 l/min pressure Drop across the mixer was 3.4 bar. The resulting dispersion had the contents of ASA, equal to 5 wt.%, and the content of the anionic polyelectrolyte (in this example, the content of SiO2)equal to 5.0 wt.% per ASA, and the amine content was varied from 0 to 2.0 wt.% per ASA.

Received dispersions 1-4 shown in Table 1, in which the content of SiO2and amine are given in the calculation of the ASA.

Table 1
Variance No. SiO2(%)TEA (%)
150
250,5
351,0
452,0

The degree of dispersion of droplets ASA were measured by using a Malvern Mastersizer Microplus after diluting the dispersion with water to the ASA content of 0.5 wt.%. The results are shown in Table 2. D(v 0,1), D(v, 0.5) and D(v 0,9) mean respectively 10, 50 and 90% of the particles had a diameter less than the given size.

Table 2
Variance No.Particle size (m)
D(v 0,1)D(v 0,5)D(v 0,9)
10,43with 4.6412,42
20,822,32to 6.88
30,50 1,78of 5.40
40,591,43and 5.30

As can be seen in Table 2, the dispersion according to the present invention, the dispersion No. 2-4, showed smaller particle sizes compared to the dispersion, used for comparison, the dispersion No. 1.

To assess the effectiveness of sizing received paper sheets according to the standard method SN-s:76 and measured the sizing in terms Cobb-60 according to the standard method Tappi T441.

Paper sheets were received, which was added to the dispersion to the aqueous suspension of cellulose containing recycled pulp and had a concentration of fiber 0.5 g/l, conductivity of 0.7 MS/cm and pH around 7.0. The dispersion was added in the amount of 0.5, 1.0 and 1.5 kg/t translated into ASA and based on the weight of dry matter of the suspension of cellulose. Did you use substances to improve uderzhivaemoi filler containing 6 kg/t of cationic potato starch (Perlbond 970) and 0.5 kg/t Sol of silica (Eka NP 442) translated into solids and calculated on dry substance of the suspension of cellulose.

Measured values Cobb-60; the results are presented in Table 3. Smaller amount Cobb absorption means less water and therefore achieve the best sizing.

Table 3
Variance No.Cobb-60
0.5 kg/t1.0 kg/t1.5 kg/t
116414495
21424229
31453826
4482421

As can be seen in Table 3, the dispersion according to the present invention, the dispersion No. 2-4, showed improved efficiency sizing in comparison with dispersion, used for comparison, the dispersion No. 1.

Example 2

To prepare dispersion and evaluate the effectiveness of gluing them in accordance with the General methods of Example 1, except that used different silica content at constant amine content. The dispersion had the contents of ASA, equal to 5 wt.% based on the weight of the dispersion. The results are shown in Table 4.

Table 4
Variance No.SiO2(%)TEA (%)Cobb-60 (1 kg/t)
50229
61225
73223
84221
95225

As can be seen in Table 4, the dispersion according to the present invention, the dispersion No. 6-9, showed improved efficiency sizing in comparison with dispersion, used for comparison, variance No. 5.

Example 3

Received and evaluated dispersion in accordance with the General methods of Example 1. Comparing dispersion in aqueous suspensions of cellulose having a high conductivity due to the addition of calcium chloride. Measured wire is for suspensions, using the device WTW LF 330 Christian Berner. The results are presented in Table 5.

Table 5
Variance No.ASA (%)SiO2(%)TEA (%)Conductivity, MS/cmCobb-60
0.5 kg/t1.0 kg/t1.5 kg/t
105024128123117
11552412610848
105028146141135
11 52812510547

As can be seen in Table 5, the dispersion according to the present invention, the dispersion No. 11, showed significantly better efficacy sizing in comparison with dispersion, used for comparison, variance No. 10, in the case where was increased conductivity of the suspension.

Example 4

Received and evaluated dispersion in accordance with the General methods of Example 1, except that used different amines. The resulting dispersion had the contents of ASA, equal to 5 wt.%, the content of SiO2equal to 5 wt.% per ASA, and the amine content of 2.0 wt.% per ASA.

Used amines were triethanolamine (TEA), having a molecular weight of 149, Diethylenetriamine (DETA), having a molecular weight of 103, Amin from fractionated coconut oil (FCA), having a molecular weight of about 200, and chloride dimethylammonio of negidrirovannogo fat (DTDMAC), having a molecular weight of about 530.

The particle sizes are presented in Table 6.

Table 6
Variance No. Amin in varianceParticle size (m)
D(v 0,1)D(v 0,5)D(v 0,9)
12DTDMAC0,342,059,79
13FCA0,4133,2211,0
14DETA0,130,41to 1.86
15TEA0,110,270,67

The results of the evaluation of the effectiveness of the sizing shown in Table 7.

Table 7
Variance No.Amin in varianceCobb-60
0.5 kg/t1.0 kg/t1.5 kg/t
12DTDMAC 1064429
13FCA1148339
14DETA872623
15TEA512621

As can be seen in Tables 6 and 7, the dispersion according to the present invention, the dispersion No. 14 and 15, which contain amines having a molecular weight of less than 180 (dispersion No. 14 and 15) and having a hydroxyl group (dispersion No. 15), showed smaller particle size and significantly improved the efficiency of the sizing compared to the dispersions used for comparison, variance No. 12 and 13. This also means that according to the present invention requires less energy to leave the surface free.

Example 5

Prepare and evaluate dispersion in accordance with the General methods of Example 1, except that used different anionic polyelectrolytes. The resulting dispersion had the contents of ASA, equal to 5 wt.%, the content of SiO2equal to 50 wt.% per ASA, and the content of triethanolamine, equal to from 0 to 2.0 wt.% per ASA. Used electrolytes are shown in Table 8.

Table 8
Anionic polyelectrolyteDescriptionTrade namePrimary particle size (nm)
AColloidal aluminized silicaEka NP 5903
BColloidal silicaEka BMA-05,5
CColloidal silicaBindzil 50/8034
DBentoniteHydrocolscaly structure
EBentoniteOpazil AVscaly structure

Bentonites suspended in water (5 wt.% bentonite) and kept for 5 days to achieve sufficient swelling and rasslaivanie is.

Determine the size of the particles and evaluated stability. Stability was measured 2 hours after receipt. If, however, remained stable after 24 hours, it is again determined the particle size. The term "sec." means "separation". The results are shown in Table 9.

The results of the evaluation of the effectiveness of the sizing shown in Table 10.

Table 10
Variance No.Anionic polyelectrolyteThe amine content (%)Cobb-60
0.5 kg/t0.75 kg/t1.0 kg/t
16A-12810364
17A2894429
18B-1296233
19B2914033
20C-11610266
21C21284531
22D-12011291
23D2883428
24E-122127120
25E2994129

As can be seen in Tables 9 and 10, the dispersion according to the present image is the shadow, variance No. 17, 19, 21, 23 and 25, which contain both anionic polyelectrolyte, and nitrogen-containing organic compound showed the best efficiency sizing, better stability and a smaller particle size compared with the dispersions used for comparison, dispersions No. 16, 18, 20, 22 and 24, which did not contain any nitrogen-containing organic compounds.

Example 6

Received a variance and estimated the particle size and the efficiency of the sizing dispersions in accordance with the General methods of Example 1, except that used different surfactants and different content. Used anionic polyelectrolyte was colloidal silica (Eka N 780) in the form of an aqueous Sol having a content of SiO2equal to 7.5 wt.%, and contained silica particles with a specific surface area of about 900 m2/g, which has been modified by aluminum. Used with the amine was triethanolamine (TEA). The resulting dispersion had the contents of ASA, equal to 5 wt.%, the content of SiO2equal to 5 wt.% per ASA, and the amine content of 2.0 wt.% per ASA.

In the variance No. 26 did not enter any surfactants. Hydrolyzed ASA as a surfactant was injected into the dispersion No. 27 and 28. Surface-active agent, polzovavshijsya in dispersion No. 29, was ether phosphoric acid (poly(oxy-1,2-ethandiyl)alpha isotridecyl-omega-hydroxyphosphate). The content of surfactants in the dispersion introduced in the calculation of the ASA. The measurement results of the particle size shown in Table 11.

Table 11
Variance No.Surfactant in the dispersionThe content of surfactant (%)Particle size (m)
D(v 0,1)D(v 0,5)D(v 0,9)
26--0,334,6714,53
27hydrolyzed ASA10,292,427,63
28hydrolyzed ASA2.50,120,451,83
ether phosphoric acid10,171,054,16

Evaluated the effectiveness of the sizing dispersion and compared to the dispersion in an aqueous suspension of cellulose containing 70% pulp (Kraft pulp from Bereza-pine raw materials in a ratio of 80/20) and 30% filler (CaCO3).

Table 12
Variance No.Conductivity, MS/cmCobb-60
0.5 kg/t0.75 kg/t1.0 kg/t
260,4918470
270,4816954
280,4724831
290,476 4941
260,7877875
270,7816454
280,7764731
290,7735237

As you can see by the results presented in Tables 11 and 12, the dispersion No. 27, 28 and 29, containing surfactant, showed smaller particle size and better sizing than the variance, which does not contain any surfactant.

Example 7

The dispersion of Example 6 was evaluated for effectiveness sizing using aqueous suspension of cellulose containing unbleached Kraft pulp and having different conductivity. The results are shown in Table 13.

44
Table 13
Variance No. Conductivity, MS/cmCobb-60
0.5 kg/t0.75 kg/t1.0 kg/t
260,41007237
270,4864227
280,4402823
290,4492822
280,7442722
264,09710076
274,0895228
284,02723
294,01029876

As can be seen in Table 13, the dispersion No. 27, 28 and 29, containing surfactant, showed the best efficiency sizing than the variance, which does not contain any surfactants, dispersion No. 26.

1. Aqueous dispersion of pulp and active sizing agent containing the anhydride of the acid, anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium base having a molecular weight of less than 180.

2. Aqueous dispersion of pulp and active sizing agent containing the anhydride of the acid, anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium base having one or more hydroxyl groups.

3. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing compound has a molecular weight up to 170.

4. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing compound has a molecular weight of up to 160.

5. Aqueous dispersion according to claim 1, in which toroi nitrogen-containing compound has one or more hydroxyl groups.

6. Aqueous dispersion according to claim 5, in which one or more hydroxyl groups are present in end location of one or more of the substituents nitrogen-containing compounds.

7. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing compound is an amine.

8. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing compound is a Quaternary ammonium base.

9. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing compound is Diethylenetriamine, Triethylenetetramine, hexamethylenediamine were, diethylamin, dipropylamine, Diisopropylamine, cyclohexylamine, pyrrolidine, guanidine, triethanolamine, monoethanolamine, diethanolamine, 2-methoxyethylamine, aminoethylethanolamine, alanine, lysine, choline hydroxide, a hydroxide of Tetramethylammonium or hydroxide of tetraethylammonium.

10. Aqueous dispersion according to any one of claims 1 and 2, in which the anionic polyelectrolyte is an inorganic material.

11. Aqueous dispersion of claim 10 in which the anionic polyelectrolyte is a silicon-containing material.

12. Aqueous dispersion according to claim 11, in which the anionic polyelectrolyte is bentonite.

13. Aqueous dispersion according to claim 11, in which the anionic polyelectrolyte contains particles are silicon-based.

14. Aqueous dispersion according to any one of claims 1 and 2, in which the acid anhydride is out-of octets is appreciated-succinic anhydride, out-of octadecyl-succinic anhydride, n-hexadecanyl-succinic anhydride, dodecenyl-succinic anhydride, decenyl-succinic anhydride, octenyl-succinic anhydride, three-isobutyl-succinic anhydride, 1-octyl-2-decenyl-succinic anhydride or 1-hexyl-2-octenyl-succinic anhydride.

15. Aqueous dispersion according to any one of claims 1 and 2, in which the acid anhydride is present in an amount of from 0.1 to 30 wt.% based on the weight of aqueous dispersion.

16. Aqueous dispersion according to any one of claims 1 and 2, in which the anionic polyelectrolyte is present in an amount of from 0.5 to 10 wt.% based on the weight of the anhydride of the acid.

17. Aqueous dispersion according to any one of claims 1 and 2, in which the nitrogen-containing organic compound is present in an amount of from 0.5 to 10 wt.% based on the weight of the anhydride of the acid.

18. Aqueous dispersion according to any one of claims 1 and 2, in which the dispersion additionally contains an anionic surfactant.

19. Aqueous dispersion for p, in which the anionic surface-active agent is hydrolyzed anhydride acid.

20. A method of obtaining a water dispersion of pulp and active sizing agent, which includes the dispersion of the acid anhydride in the aqueous phase in the presence of an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium the m base, having a molecular weight of less than 180.

21. A method of obtaining a water dispersion of pulp and active sizing agent, which includes the dispersion of the acid anhydride in the aqueous phase in the presence of an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or the corresponding Quaternary ammonium base having one or more hydroxyl groups.

22. The method according to any of PP or 21, in which the nitrogen-containing compound has a molecular weight up to 170.

23. The method according to any of PP or 21, in which the nitrogen-containing compound has a molecular weight of up to 160.

24. The method according to any of PP or 21, in which the nitrogen-containing compound has one or more hydroxyl groups.

25. The method according to paragraph 24, in which one or more hydroxyl groups are present in end location of one or more of the substituents nitrogen-containing compounds.

26. The method according to any of PP or 21, in which the nitrogen-containing compound is an amine.

27. The method according to any of PP or 21, in which the nitrogen-containing compound is a Quaternary ammonium base.

28. The method according to any of PP or 21, in which the nitrogen-containing compound is Diethylenetriamine, Triethylenetetramine, hexamethylenediamine were, diethylamin, dipropylamine, India is Propylamine, cyclohexylamine, pyrrolidine, guanidine, triethanolamine, monoethanolamine, diethanolamine, 2-methoxyethylamine, aminoethylethanolamine, alanine, lysine, choline hydroxide, a hydroxide of Tetramethylammonium or hydroxide of tetraethylammonium.

29. The method according to any of PP or 21, in which the anionic polyelectrolyte is an inorganic material.

30. The method according to clause 29, in which the anionic polyelectrolyte is a silicon-containing material.

31. The method according to item 30, in which the anionic polyelectrolyte is bentonite.

32. The method according to item 30, in which the anionic polyelectrolyte contains particles are silicon-based.

33. The method according to any of PP or 21, in which the acid anhydride is ISO-octadecenyl-succinic anhydride, ISO-octadecyl-succinic anhydride, n-hexadecanyl-succinic anhydride, dodecenyl-succinic anhydride, decenyl-succinic anhydride, octenyl-succinic anhydride, three-isobutyl-succinic anhydride, 1-octyl-2-decenyl-succinic anhydride or 1-hexyl-2-octenyl-succinic anhydride.

34. The method according to any of PP or 21, in which the acid anhydride is present in an amount of from 0.1 to 30 wt.% based on the weight of aqueous dispersion.

35. The method according to any of PP or 21, in which the anionic polyelectrolyte is present in an amount of from 0.5 to 10 wt.% based on the weight of the anhydride of the acid.

36. The method according to any of PP or 21, in which attadia is it organic compound is present in an amount of from 0.5 to 10 wt.% based on the weight of the anhydride of the acid.

37. The method according to any of PP or 21, in which the dispersion additionally contains an anionic surfactant.

38. The method according to clause 37, in which the anionic surface-active agent is hydrolyzed anhydride acid.

39. The use of aqueous dispersion of pulp and active sizing agent according to any one of claims 1 to 19 for gluing in the mass or surface sizing in the manufacture of paper.

40. Method for the production of paper which contains the addition of an aqueous dispersion of pulp and active sizing agent to the aqueous suspension of cellulose and dewatering the obtained suspension on the grid paper machine or the application of a water dispersion of pulp and active sizing agent on the surface of the sheet or webs of cellulose, while the dispersion is an aqueous dispersion of pulp and active substances according to any one of claims 1 to 19.

41. The method according to p, in which the aqueous suspension of cellulose has a conductivity of at least a 2.0 MSM/see



 

Same patents:

FIELD: textile, paper.

SUBSTANCE: ground paper contains a certain amount of cellulose fibres and a gluing substance, besides, ground paper has a coefficient of hygro-expansion from 0.6 to 1.5%, inner link of Scott in cross direction not more than 130 J/m2 and/or inner link of Scott in longitudinal direction of not more than 130 J/m2.

EFFECT: increased stability of dimensions and strength of ground paper surface.

28 cl, 28 dwg, 12 tbl, 5 ex

FIELD: textile, paper.

SUBSTANCE: emulsion contains anhydrides of fatty acids, which are produced from unsaturated or saturated fatty acids or their mixtures with length of chain from 12 to 24 carbon atoms and are preserved as liquid at the temperature below 50C. If necessary, emulsion for paper sizing additionally contains a reactive or a non-reactive agent for sizing and/or a fixator with aluminium ions content. Emulsion for paper sizing is produced by emulsification of fatty acids in water phase by means of shearing forces or intense mixing. Emulsifiers are used to form emulsion. Emulsion is used for continuous sizing of paper mass or to treat paper surface in sizing press. Emulsion is used to produce paper.

EFFECT: eliminates formation of sediments with sticky consistency with regular indices of pH in process of paper making and reduced duration of contact with water system.

16 cl, 4 tbl, 5 ex

FIELD: construction.

SUBSTANCE: ground contains cation water-fast additive, alkaline glueing agent and anion activator in specified amount. Anion activator it contains is a component selected from group, including polyacrylate, sulfonate, carboxymethylcellulose and galactomannan hemicellulose. Ground paper has pH from approximately 7.0 to approximately 10, and strength of internal link from approximately 25 to approximately 350 millifeet per pound per square inch. This ground paper is produced by contact of a certain amount of cellulose fibres with water-fast additive, alkaline gluing agent and anion activator, serially and/or simultaneously.

EFFECT: improved physical properties of ground paper and expanded assortment of paper tapes to cover joints.

22 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: substrate has a paper base containing cellulose fibre from deciduous wood with particle size smaller than 200 mcm after grinding in amount of not more than 45 wt % and average fibre length between 0.4 and 0.8 mm and filler in amount of 5-40 wt %, particularly 10-25 wt % in terms of the weight of cellulose.The substrate at least contains one polymer layer lying at least on one side of the paper base. There is a layer with a binding agent between the polymer layer and the paper base. The binding agent is a hydrophilic film-forming polymer made from hydroxypropylated starch and/or thermally modified starch. This layer may contain a pigment in form of calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulphate.

EFFECT: reduced limpness and obtaining pure-bred production wastes.

27 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: adhesive contains a basic component in form of brewer's or distiller's yeast which is a waste from the brewing or distillation industry. The residue of brewer's or distiller's yeast is treated with 2% sodium hydroxide solution in ratio of 1:1. The adhesive composition contains the treated residue of brewer's yeast, glycerin and boric acid. Components of the composition are in the following ratio, pts. wt: residue of brewer's or distiller's yeast treated with 2% sodium hydroxide solution in ratio of 1:1 96.0-98.0; glycerin 1.9-3.7; boric acid 0.1-0.3.

EFFECT: adhesive composition has high adhesive capacity and low cost.

2 tbl

Paper making method // 2384661

FIELD: textile, paper.

SUBSTANCE: method relates to paper production and can be used in pulp-and-paper industry. Method involves the use of cellulose suspension from cellulose fibres and fillers (optional), dehydration of cellulose suspension on grid or sieve so that a sheet can be formed. Then the sheet is dried. In this method there used is polymeric addition which includes ethylenically unsaturated monomer soluble in water or potentially soluble in water, and ethylenically unsaturated monomer containing a reactive group. The latter represents an epoxy group. The polymeric addition used has molar weight which is less than one million. Polymer is obtained from mixture of monomers, which includes acrylamide and glycidyl methacrylate. Thus, the obtained polymer is used as an addition for increase of paper durability in dry condition, in wet condition, as reagent for internal paper sizing and for surface sizing.

EFFECT: increasing paper durability.

17 cl, 2 tbl, 3 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: textile fabrics, paper.

SUBSTANCE: composition concern pulp and paper industry and is intended for cellulose-bearing materials surface treatment. The first composition includes modified carbamide - formaldehyde oligomer and in the capacity of modifier is sodium salt of carboxymethyl cellulose. The second composition contains mentioned above components and melamine. The third composition contains components of the first composition and cationic starch.

EFFECT: improving of composition and strength properties of cellulose-bearing materials.

3 cl, 3 tbl, 12 ex

FIELD: soft wares, paper.

SUBSTANCE: compound is intended for pulp materials hydrophobisation and can be used in pulp and paper industry and at paper and board manufacturing. Compound contains modified thallous galipot, paraffin, thallous fatty acids and balancer at defined components ratio. In the capacity of balancer sodium lauryl sulfate, sodium laureth sulfate, cocoamidopropylbetain or cocoamidopropylaminochloride is used.

EFFECT: compound refinement for hydrophobisation of pulp materials, supplying of its hydrophobization efficiency and storage life duration.

5 cl, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: glue is meant for cellulose materials processing and can be used in pulp and paper industry for production of paper and cardboard. The glue contains carbamide, formaldehyde and, as a modifying agent, melamine and cationic starch at certain rate of mixture.

EFFECT: improved quality of glue thanks to the increase in its hydrophobic property and stability.

1 tbl, 1 ex

FIELD: printing industry.

SUBSTANCE: pigment composition in the form of aqueous suspension includes pigment particles of synthetic amorphous silicon dioxide or aluminium silicate, at least one water-soluble aluminium salt and at least one cationic polymer having molecular weight from approximately 2000 to approximately 1000000, and density of charge is from around 0.2 to around 12 meq/g. Particles of synthetic amorphous silicon dioxide or aluminium silicate are selected from the group that consists of deposited silicon dioxide, silicon dioxide in the form of gel, colloidal primary particles of silicon dioxide, aluminium silicate or their mixture, porous aggregates formed by aggregation of primary colloidal particles of silicon dioxide, aluminium silicate or their mixture in aqueous sol or mixture of one or several above mentioned types of particles. Amount of cationic polymer makes from approximately 0.1 to 15 wt % per amount of dry pigment particles. Method for production of pigment composition includes mixing particles of synthetic amorphous silicon dioxide or aluminium silicate, water soluble aluminium salt and cationic polymer without gel formation or deposition. Composition is used to apply coating onto paper or cardboard web.

EFFECT: pigment composition is easily applied onto surface of paper or cardboard for jet printing.

20 cl, 4 ex

FIELD: printing industry.

SUBSTANCE: composition of pigment in the form of aqueous dispersion or suspension is described, including (a) porous aggregates created by aggregation of colloid primary particles of silicon dioxide, aluminium silicate or their mixture in water sol, and having average diametre from 0.03 to 25 mcm, and (b) particles of filler, average size of particles in which is more than average diametre of porous aggregates, at mass ratio of porous aggregates to filler particles from 0.01:1 to 3:1. The following are also described: method for its use, composition for coating of paper or cardboard and method for its application, method for coating of paper or cardboard and paper or cardboard made by this method.

EFFECT: production of high-quality paper or cardboard for use in jet printing and improvement of printing quality.

16 cl, 4 tbl, 4 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.

SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.

EFFECT: simplified method and improved quality of paper sheet.

17 cl, 16 dwg, 1 tbl, 3 ex

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m2/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

FIELD: construction.

SUBSTANCE: paper surface is treated with glue, including water, a latex binder and a mineral filler with the specified ratio of components. The latex binder is selected from the group, including ethylene polyvinyl acetate, polyvinyl acetate latex, styrene butadiene rubber, acrylic and vinyl acrylic rubber. A sheet material is also proposed to line a gypsum wall board, as well as the method to produce treated paper and glue for surface treatment.

EFFECT: higher strength of a wall board by using a smaller ratio of water-gypsum, its improved characteristics with provision of lower energy consumption.

46 cl, 2 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: emulsion contains anhydrides of fatty acids, which are produced from unsaturated or saturated fatty acids or their mixtures with length of chain from 12 to 24 carbon atoms and are preserved as liquid at the temperature below 50C. If necessary, emulsion for paper sizing additionally contains a reactive or a non-reactive agent for sizing and/or a fixator with aluminium ions content. Emulsion for paper sizing is produced by emulsification of fatty acids in water phase by means of shearing forces or intense mixing. Emulsifiers are used to form emulsion. Emulsion is used for continuous sizing of paper mass or to treat paper surface in sizing press. Emulsion is used to produce paper.

EFFECT: eliminates formation of sediments with sticky consistency with regular indices of pH in process of paper making and reduced duration of contact with water system.

16 cl, 4 tbl, 5 ex

FIELD: textile, paper.

SUBSTANCE: method concerns reducing speed of photoyellowing of paper containing mechanical pulp. The method includes coating the surface of a paper sheet during papermaking of aqueous solution containing an effective amount of one or more salts of thiocyanic acid.

EFFECT: improvement of stability to photoyellowing of paper and cost-effective way while reducing its toxicity.

16 cl, 10 tbl

FIELD: paper industry.

SUBSTANCE: method is intended to impart dirt and/or moisture resistance to porous substrate for protected documents, and also relates to dirt and/or moisture resistant protected document. Method includes application of dirt and/or moisture resistant compound onto opposite surfaces of porous substrate having porosity of approximately 20-100 millilitres per minutes and its impression into pores of substrate. At the same time compound penetrates and spreads at least in part of substrate thickness, then excess compound is removed from opposite surfaces of substrate. Coating press is used to impress dirt and/or moisture resistant compound into pores of substrate.

EFFECT: specified compounds applied by suggested method do not darken optically variable effects generated by non-porous film structures on the basis of microlenses, which may be used on or inside these protected documents, and thin layers of fibres applied and this introduced into parts of protective devices in protected documents containing windows with dirt and/or moisture resistant properties according to the present invention, demonstrate improved durability.

22 cl, 1 ex

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