Impregnation of paper

 

(57) Abstract:

The invention is intended for use in paper production. Proposed water dispersion of a sizing agent containing chemically active with respect to the cellulose sizing agent and a dispersant composition which contains a low molecular weight cationic organic compound having a molecular weight less than 10,000, and anionic stabilizer, which is an anionic polyelectrolyte, its preparation, and a method of obtaining a practically anhydrous composition containing the above components. Acceptable anionic stabilizers suitable for use in this invention include anionic compounds that act as stabilizers and/or which is effective in combination with cationic compounds for the stabilization of the sizing agent in the aqueous phase, and anionic compounds as dispersing agents in the preparation of dispersions for sizing. Preferably, the anionic compound was vodorostvorima or water-dispersible. Anionic stabilizer may be selected from organic or inorganic compounds and may be a substance of natural or synthetic PP. f-crystals, 7 PL.

The present invention relates to the sizing of paper and, in particular, to the dispersions of chemically active with respect to the cellulose sizing agents, the receipt of such dispersions and their use.

PRIOR ART

Chemically active with respect to the cellulose sizing agents, such as those that basically have a dimer of alkylbetaine (DAK) and alchemistry anhydride (AA), widely used in paper production, at a neutral or weakly alkaline pH of the pulp to make the paper or paper cardboard certain resistance to wetting and penetration of aqueous liquids. Paper adhesives based on chemically active with respect to the cellulose sizing agents are usually a dispersion containing an aqueous phase and a finely dispersed therein particles or droplets of a sizing agent. The dispersions are usually prepared with dispersant composition consisting of anionic compounds, such as sodium lignosulphonate, in combination with high molecular weight amphoteric or cationic polymer, for example, cationic starch, polyamines, polyamidoamine, or vinyl polymer. Depending on Sunny or anionic in nature. However, the dispersion of these types generally have a very low stability and high viscosity, even at relatively low solids contents, which, of course, causes some difficulties when handling dispersions, for example, during storage and use. An additional disadvantage is that these products are available in the form of dilute dispersions, which increases the cost of transportation per active component sizing agent.

Chemically active with respect to the cellulose sizing agents usually give good results at low dosages sizing agent. However, from experience it is known that the effectiveness of conventional chemically active with respect to the cellulose substances for sizing decreases when they are used together with the processed raw material with high absorption ability of cations and containing a significant amount of lipophilic extractives of wood origin, such as, for example, resin acids, fatty acids, esters of fatty acids, triglycerides, and others. Because of the anionic nature of lipophilic substances containing carboxylate or kerivnih substances, usually has a very high capacity for the absorption of cations. It was found that the presence of lipophilic substances adversely affects the adsorption of fiber sizing agents that can cause low results sizing. In order to improve the quality of sizing when working with this raw material, the paper manufacturer was forced to increase the dose of a sizing agent, which of course is undesirable for economic reasons and may lead to increased accumulation of sizing agent in the white water re-circulating in the paper production process. These issues are of particular importance for paper mills, where white water intensive recycle and fresh water is added only in small quantities; as a result, increases the ability of white water to absorb cations and the accumulation of lipophilic extractives and unabsorbed sizing agent as in white water and paper pulp coming next stage water separation.

DETAILED DESCRIPTION OF THE INVENTION

In accordance with the present invention it was found that the increased stability and superior sizing properties can be achieved in ivaldi agent dispersed in an aqueous phase by dispersing the composition, including low molecular weight cationic compound and an anionic stabilizer. Dispersion for sizing according to this invention are characterized by excellent stability and low viscosity, and they are especially convenient when using raw materials for the production of paper having a high capacity for the absorption of cations and/or containing large amounts of lipophilic substances. It was also found that better results sizing can be achieved by the use of such dispersions in the production of paper, in which white water is heavily recycle. In particular, the invention relates to aqueous dispersions containing chemically active with respect to the cellulose sizing agent, and a dispersant composition comprising a low molecular weight cationic compound and an anionic stabilizer, receipt and use of such dispersions, as further specified in the claims.

Presents the variance for sizing make possible the production of paper with a higher quality sizing compared to conventional dispersions, when the same dosage is chemically active with respect to the cellulose sizing agent and the use of lower doses of chemically and the awn use smaller amounts of sizing agent to provide the desired degree of sizing, reduces the risk of accumulation readsorbing sizing agent in the white water re-circulating system, thereby reducing the risk aggregation and sedimentation sizing agent in papermaking machine. The proposed invention thus provides significant economic benefits and technical advantages.

Chemically active with respect to the cellulose sizing agent in accordance with the invention can be selected from the group of chemically active with respect to the cellulose sizing agents known at the moment. Acceptable if a sizing agent selected from the group consisting of hydrophobic ketene dimers, oligomers of ketene, acid anhydrides, organic isocyanates, carbamoylation and mixtures thereof; preferably the ketene dimer and anhydrides of acids, most preferably of ketene dimer. Acceptable dimer Ketanov have the General formula (I) below, where R1and R2represent a saturated or unsaturated hydrocarbon group, typically saturated hydrocarbon residues, acceptable hydrocarbon groups have from 8 to 36 carbon atoms, are usually normal or branched alkyl groups having the lot can be described by the formula (II), below, where R3and R4may be the same or different and may represent a saturated or unsaturated hydrocarbon group, preferably containing from 8 to 30 carbon atoms, or3and R4together with-C-O-C fragment can form a 5 - or 6-membered cycle, which, in turn, can be used as surrogate to have a hydrocarbon group containing up to 30 carbon atoms. Examples of anhydrides of acids that are used on an industrial scale include alkyl - or alkenylamine anhydrides and especially isooctadecyl-succinic anhydride.

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Acceptable dimer katenov, acid anhydrides, organic isocyanates include compounds described in U.S. patent N 4522686, which are included in the scope of our application by reference. Examples of acceptable carbamoylation include compounds described in U.S. patent N 3887427, which are also included in the scope of our application by reference.

In addition to the chemically active with respect to the cellulose sizing agent, a sizing dispersion may also contain a substance for sizing, chemically inactive with respect to the cellulose. Examples of acceptable sizing agents of this type on anyh acids, for example, fatty amides and fatty esters, such as triglycerides of natural fatty acids.

The dispersions of this invention contain a dispersant or dispersant composition comprising a cationic organic compound and an anionic stabilizer. These compounds preferably are connected together by the force of electrostatic attraction, representing, thus, a hybrid disperser. When sharing these compounds are effective as a dispersant sizing agent, although cationic compound and/or anionic compound when applied separately, should not contribute to the dispersion. The group is particularly preferred dispersions in accordance with this invention include those that contain cationogenic surfactant and anionic stabilizer, as will be described below. In a preferred embodiment of the invention the dispersion is anionic in nature, i.e., dispersant composition has a total anionic charge.

Cationic compound contains one or more cationic groups are the same or different types, and includes cationic compounds having at least one cationic group and a cationic compound having two one group, phosphonium group, salt accession acid formed by primary, secondary or tertiary amines or amino groups and Quaternary ammonium groups, for example, substances in which nitrogen was quaternity using methyl chloride, dimethylsulfate or benzylchloride, preferably salt accession acid formed amines or amino groups and Quaternary ammonium groups. Cationic polyelectrolytes can have a degree of substitution, changing in a wide range; the degree of substitution of cations (soto; DSccan vary from 0.01 to 1.0, acceptable from 0.1 to 0.8 and preferably from 0.2 to 0.6. Acceptable for use in this invention, the cationic organic compounds include cationic compounds that can act as surfactants and/or dispersing agents and/or retaining agent between the particles or droplets of a sizing agent and an anionic stabilizer. Preferably, the cationic compound was surface-active substance. Preferred cationic surfactants include compounds having the General formula R4N+X-where each R group is independently the groups, having from 1 to about 30 carbon atoms, preferably from 1 to 22 carbon atoms; and (iii) hydrocarbon groups, for example, aliphatic and preferably alkyl groups having up to about 30 carbon atoms, preferably from 4 to 22 carbon atoms and which may contain 1 or more heteroatom, for example oxygen or nitrogen, and/or groups containing a heteroatom, such as carbonyl and alloctype; where at least one satisfactorily, if at least 3 and preferably all of the above R groups contain carbon atoms; satisfactorily, if at least one and preferably at least two of the above R groups contain at least 7 carbon atoms, preferably at least 9 carbon atoms and most preferably at least 12 carbon atoms; and where X-represents an anion, usually a halide like chloride, or anionic group present in the anionic compound dispersing substances, for example, where the surfactant is a protonated amine of the formula R3N, in which R and N are defined above. Examples of acceptable surfactants include dioktyldimethylammonium chloride, didecylammonium chloride, decollimation the ammonium chloride, dioctadecyl of dimethylammonium chloride, directdelivery chloride, di(hydrogenated tallow) dimethylammonium chloride, di(hydrogenated tallow) benzylmethylamine chloride, (hydrogenated fat) benzyldimethylammonium chloride, mileydeminiley chloride, and di(ethylene hexadecacarbonyl) dimethylammonium chloride.

Thus, the group is particularly preferred cationic surfactants include compounds that contain at least one hydrocarbon group having 9 to 30 carbon atoms, and which necessarily Quaternary ammonium compounds.

Additional preferred cationic surfactants include Quaternary di - and polyammonium compounds containing at least one hydrocarbon group, typically aliphatic and preferably alkyl, having from 9 to about 30 carbon atoms, preferably from 12 to 22 carbon atoms. Examples of acceptable surfactants of this type include N-octadecyl-N-dimethyl-N'-trimethyl-propylene-diammonium dichloride.

Preferred cationic polyelectrolytes include low molecular weight Karamanov and Gurovich resins, cationic condensation products of the type of cationic polyurethanes, polyamidoamine, for example, polyamidoamine-epichlorhydrin copolymers, polyamine, for example, dimethylamine-epichlorhydrine copolymers, dimethylamine - Ethylenediamine-epichlorhydrine copolymers, copolymers ammonia-dichloroethane, vinyl polymers formed from monomers with cationic groups, for example, homopolymers and copolymers diallyldimethylammonium chloride, dialkylaminoalkyl, methacrylates and acrylamides (for example, dimethylaminoethylacrylate and methacrylates), which are usually presented in the form of salts accession acid or Quaternary ammonium salts, which (monomers with cationic groups) may copolymerizable with non-ionic monomers including acrylamide, alkylacrylate, styrene and Acrylonitrile, and derivatives of these monomers, vinyl esters, etc.

Molecular weight cationic organic compounds mainly can be up to about 10,000, usually up to about 5000, valid up to about 3000 and preferably up to about 800. The molecular weight is usually at least about 200. Acceptable cationic surfactants can have a molecular weight up to about 3000 and the preferred katianna is installed stabilizers, used in this invention include anionic compounds that act as stabilizers and/or effective in combination with a cationic compound to stabilize sizing agent in the aqueous phase; also, as you know, anionic compounds useful as dispersants in obtaining a sizing dispersion. Preferred is an anionic compound, which vodorostvorima or dispersible in water. Anionic stabilizer may be selected from organic or inorganic compounds, and it can occur from natural or synthetic sources. Anionic dispersing stabilizer composition contains one or more anionic groups are the same or different types and include anionic compounds having at least one anionic group and anionic compounds having two or more anionic groups, referred to here as anionic polyelectrolytes. The term "anionic polyelectrolyte" also includes anionic compounds, acting like polyelectrolyte, for example, through a chemical non-ionic interaction or attraction. In a preferred embodiment of the invention the anionic stabilizer is an anionic polyelectrolyte. Examples of acceptable Academy of Sciences of the room, sulphate, sulphonate, an acid residues sulfonic and carboxylic acids and their salts, usually ammonium salts or alkali metal (mainly sodium). The anionic group may be of natural origin or may be introduced by chemical modification of known methods. Anionic stabilizer may have a degree of substitution of anions (soand; DSa), varying in a wide range; Szandmay amount to from 0.01 to 1.4, acceptable from 0.1 to 1.2 and preferably from 0.2 to 1.0. Anionic polyelectrolytes may contain one or more cationic groups, but their number should not exceed the number of anionic groups and the total charge must be negative.

In a preferred embodiment of the invention the anionic stabilizer is selected from organic compounds. Acceptable anionic stabilizers of this type include polymeric compounds such as those that basically have the polysaccharides of the type starches, Gurovich resins, cellulose chetinov, chitosans, glycans, galactanes, glucans, xanthan resins, mannans, dextrins, and so on , preferably phosphated, sulfated and karboksilirovanie polysaccharides, and synthetic org is tion, based on naphthalene, for example, condensation products of naphthalenesulfonates, and vinyl polymers formed from monomers having anionic groups, for example, acrylic acid, methacrylic acid, maleic acid, basis of itaconic acid, crotonic acid, vinylsulfonic acid, sulfonated styrene and phosphates hydroxyalkylated acrylates and methacrylates may copolymerizing with non-ionic monomers including acrylamide, alkylacrylate, styrene and Acrylonitrile on a par with derivatives of such monomers, vinyl esters, etc. are Particularly preferred organic anionic stabilizers include anionic polysaccharides, e.g. cellulose derivatives such as carboxymethylcellulose, condensation products of naphthalenesulfonates, anionic polymers based on acrylamide and polymers based on acrylic acid and similar acids (monomers.

In a preferred embodiment of the invention the anionic stabilizer is modified in order to give him hydrophobicity and contains one or more hydrophobic groups, it is usually modified in order to give the hydrophobicity of the polysaccharide, preferably carboxymethylcellulose. Primeridian amide, ester groups and groups forming ethers, including saturated or unsaturated hydrocarbon chain of at least 4 and preferably from 8 to 30 carbon atoms, possibly comprising one or more heteroatom, for example oxygen or nitrogen, and/or groups containing a heteroatom, for example, carbonyl or aryloxy. Acceptable anionic polysaccharides, anionic polysaccharides, modified with the purpose of waterproofing and ways of introduction of hydrophobic substituents in the polysaccharides described, for example, in U.S. patent N 4687519 and in international patent N WO 94/24169 (International Pat. Publ.), which are included in the scope of our application by reference.

In another preferred embodiment of the invention the anionic stabilizer is selected from inorganic anionic substances, preferably anionic inorganic polyelectrolytes, such as, for example, compounds containing silicon atoms, for example, various types of condensed or polymerized silicic acid, which has a hydroxyl group dissociable with the formation of the negatively charged ion, for example, oligomeric silicic acid, the polysilicon acid, polysilicate and polyaluminosilicate.

Molecular weight anionic compounds may vary in a wide range: from a few hundred or thousand to several million. Usually a molecular weight of more than 200, most preferably above 500, the toga of the invention the molecular weight reaches about 50,000.

The number of cationic and anionic compounds present in the dispersions of this invention may vary in a wide range of values, depending, inter alia, on the type of cationic and anionic compounds and their charge density, the type of sizing agent, the desired anionicity/camionnette and content of the hardest substances in the final dispersion. Acceptable in the framework of the present invention may be considered an anionic dispersion, which means that the anionic charge of the anionic stabilizer is greater than the cationic charge of the cationic compounds. The cationic compound may be present in the dispersion in an amount up to 100% by weight, usually from 0.1 to 20% by weight, acceptable, if from 1 to 10% by weight and preferably from 2 to 7% by weight, based on the sizing agent; anionic stabilizer may be present in an amount up to 100% by weight, usually from 0.1 to 20% by weight, acceptable if from 0.2 to 10% by weight and preferably from 0.3 to 6% by weight, based on the sizing agent, moreover, the total charge of the cationic compound and an anionic stabilizer is present in the dispersion, preferably anionic or negative.

It was found that in this invention it is possible to obtain dispersions, kaushiki viscosity. Thus, the invention allows to obtain a dispersion for impregnation with improved stability during storage, a higher solids content and/or lower viscosity. Also, additional advantages of the proposed dispersions is that they are stable upon dilution, which means less adhesiveness of their particles or droplets of a sizing agent, leaving behind a smaller number of larger units having smaller sizing ability, less deposition of hydrophobic sizing agent for paper machine and less pollution sieves, resulting in reduced maintenance requirements of the paper machine. The proposed variance mainly can contain from about 0.1 to about 50% of a sizing agent and, more preferably, more than 20% by weight. A dispersion containing as a sizing agent dimer of ketene can contain it in an amount of 5 to 50% by weight and preferably from about 10 to about 35% by weight. Dispersion or emulsion containing as an impregnant anhydride acid can contain it in an amount of from 0.1 to about 30 weight% and typically from 1 to about 20% by weight.

oC up to 95oC, whereas the temperature for the anhydrides of acids may be lower. The emulsion obtained, which contains droplets of a sizing agent, typically having a size from 0.1 to 3.5 microns in diameter, then cooled. In addition to the above components, the variance for sizing can also be introduced by other substances, such as, for example, anionic and nonionic dispersing agents and stabilizers, fillers, for example, urea and its derivatives, and anticoagulants. It should be borne in mind that negative and positive charges compounds dispersant composition can be formed in situ, for example, in the process of interaction of one of these compounds with each other and/or as a result of mixing these compounds with an aqueous phase and/or lowering the pH of the aqueous phase. For example, separation of hydrogen from acid groups will lead to the formation of anionic saraykoy. So you can start obtaining a dispersion having connections do not carry charge, for example, there may be used organic compound with a primary amine groups or primary amine of the formula R3N, and the corresponding ammonium derivative of R4N+X-can be formed during the process of obtaining variance (values of R, N and X are defined above).

It was also found that the components of the proposed dispersions can easily be homogenized in the presence of the aqueous phase. Typically requires less energy and less shearing force for homogenization compared with the processes of obtaining normal dispersion and, thus, can be used more simple equipment. Therefore, another way of obtaining the proposed dispersion includes (i) mixing of chemically active with respect to the cellulose sizing agent with dispersing composition comprising anionic stabilizer and a cationic compound, as defined above, to obtain an intermediate composition, and (ii) homogenizing the intermediate mixture in the presence of the aqueous phase, as described above. Preferably, the components were mixed at the stage (i). A sizing agent used in studied homogenization. If desired, the intermediate composition can be removed after the stage of mixing (i) and, optionally, may be cooled for solidification with the formation of virtually anhydrous intermediate sizing composition, which makes transportation more simple from an economic point of view. In place of direct use, or any other, the sizing composition can be homogenized in the presence of water in the usual way. This method is especially useful when preparing dispersions of ketene dimer and anhydrides of the acids, the latter of which is usually prepared at a paper mill prior to use as a sizing agent in paper production process. Property stability during storage available anhydrous sizing composition is advantageous in economic and technical terms. The presented invention, thus, relates to a practically anhydrous mixture for sizing, including chemically active with respect to the cellulose sizing agent, a cationic organic compound and an anionic stabilizer, where the cationic and anionic compounds, when used together, effective as dispersant compositions for p is

In the compositions of this invention are preferably such components, as defined above, i.e., chemically active with respect to the cellulose sizing agent, a cationic compound and an anionic stabilizer. The proposed composition contains almost no water, which means that small amounts of water may be present; the water content may be from 0 to 10% by weight, acceptable, if less than 5% by weight and preferably less than 2%. Most preferably, if the composition does not contain water. The composition preferably contains chemically active with respect to the cellulose sizing agent in the vast quantity per weight, i.e. at least 50% by weight, acceptable, if the content of the sizing agent in the mixture is in the range from 80 to 99.8% by weight, and preferably from 90 up to 99.7% by weight. Cationic compound, preferably having surface-active properties, and anionic stabilizer may be present in the composition for impregnation in the quantities specified above for dispersions, where the percent concentration are based on the weight of the sizing agent. Anionic stabilizer may be present in the mixture in an amount up to 100% by weight, usually from 0.1 agent, and the cationic compound, for example, the surfactant may be present in an amount up to 100% by weight, usually from 0.1 to 20% by weight, acceptable, if from 1 to 10% by weight and preferably from 2 to 7% by weight, based on the sizing agent, and the total charge of the cationic compound and an anionic stabilizer present in the composition, preferably negative or anionic.

Dispersion in accordance with the invention can be used as usual in the manufacture of paper when working with the cellulose fibers of any type and they can be used for surface treatment and processing in the mass. The term "paper" here refers not only to paper as such, but all types of products, which are based on cellulose, in the form of sheets or rolls, including, for example, cardboard, paper and cardboard. The feedstock contains cellulose fibers, optionally in combination with mineral fillers, and usually the content of the cellulose fibers is at least 50% by weight calculated on dry raw materials. Examples of mineral fillers of conventional type include kaolin, porcelain clay, titanium dioxide, gypsum, talc and natural or synthetic carbonate also relates to a method for production of paper, in which the aqueous dispersion, such as described above, is used as the substance for the surface treatment or processing in mass. The amount of chemically active with respect to the cellulose sizing agent, usually either added to the fibrous mass containing cellulose fibers and possible fillers, which is then separated from the water on a sieve for the formation of paper, or applied to the surface of the paper as a substance for the surface treatment is usually by using a size press, is from 0.01 to 1.0% by weight, based on the weight of dry cellulosic fibers and possible fillers, preferably from 0.05 to 0.5% by weight, and the dosage depends mainly on weaving create more gluing paper or paper pulp, from chemically active with respect to the cellulose sizing agent and the desired degree of sizing.

The dispersions according to this invention, in particular anionic dispersions are especially useful for sizing in the mass, if the pulp has a high capacity for the absorption of cations and/or contains significant amounts of lipophilic substances, for example, fibrous mass, obtained from a slurry containing wood pulp or recycled pulp, for example, koganei mass, include anionic and non-ionic lipophilic substances, such as, for example, resin acids, fatty acids, fatty esters, triglycerides, etc., the Amount of lipophilic substances may be at least 10 ppm (M. D.) and up to about 100 meters doctor, usually at least 20 M. D., acceptable if at least 30 and preferably at least 50 M. D., measured in dichloromethane (DHM) by extraction DHM in a known manner. The ability acquisitions cations must be at least 50 acceptable, if not less than 100 and preferably 150 mkaku/l per liter of liquid, filtered through a layer of the fibrous mass. The absorption ability of the cations can be measured in the usual way, for example, using a Mutek Particle Charge Detector using the filtrate is passed through a layer of pulp obtained from a crude filtrate, optionally filtered through a filter with pore size of 1.6 μm and poly(diallyldimethylammonium-chloride) as the titrant. Also offer dispersions are preferably used in the process of paper production, in which water rapidly recycle, i.e., when the white water is almost completely used in closed circuit, for example, from 0 to 30 tons of fresh water consumed for receiving one less than 5 tons of fresh water per tonne of paper. The return of white water in the process preferably occurs at the stage of mixing the white water and cellulose fibers, which are preferably in the form of a fibrous mass or suspension, before or after adding a sizing dispersion produced, for example, to form a suspension of fibers in water, which can then be separated. Fresh water can be introduced into the process at any stage; for example, it can be mixed with cellulose fibers to form a pulp, and it can be mixed with paper pulp containing cellulose fiber for its dilution and formation of the suspension, which will be further dewatered on a sieve, before or after mixing paper pulp with white water and before or after addition of the sizing dispersion.

Chemicals are usually added in the production of paper pulp, such as auxiliary binders, compounds-derivatives of aluminum, dyes, resins, increases the strength of the paper in the wet state, optical brighteners, etc. can of course be used in conjunction with the proposed variances. Examples of compounds-derivatives of aluminum include alum, aluminates amyh restraint substances include cationic polymers, anionic inorganic substances in combination with organic polymers, such as bentonite in combination with cationic polymers, sols which are based on silicon dioxide in combination with cationic polymers or cationic and anionic polymers. Especially good results sizing in weight can be achieved in the case of dispersions according to this invention in combination with the restraint substances, including cationic polymers. Acceptable cationic polymers include cationic starch, guar gum, polymers based on acrylates and acrylamides, polyethylenimine, dicyandiamide-formaldehyde resin polyamine, polyamidoamine and poly(diallyldimethylammonium-chloride), and combinations thereof. It is preferable to use cationic starch and cationic polymers on the basis of acrylamido, separately and in combination with each other or with other substances. In a preferred embodiment of the invention dispersion used in combination with holding a composition comprising at least one cationic polymer and anionic particles, which are based on silicon dioxide. The proposed dispersion may be added before, between, after, or simultaneously with the VI restraint substances, for example, the cationic polymer of the type of cationic starch or cationic polymer based on acrylamide, or substance, based on silicon dioxide, before the introduction of the thus obtained mixture in recycled pulp. Accordingly, the dispersion can be obtained immediately prior to its introduction into recycled pulp, by bringing into contact a sizing dispersion containing the cationic compound, preferably a cationic surfactant and anionic substances based on silicon dioxide, such as defined above.

The invention is further illustrated by the following examples which, however, does not exhaust its scope and not intended to limit. Share and % indicates the proportion by weight and % by weight, respectively, unless otherwise indicated.

Example 1

Anionic dispersion of a dimer of alkylbetaine (DAK), in accordance with the invention were prepared by mixing di(hydrogenated tallow) dimethylammoniumchloride, which is a cationic surface-active agent, manufactured for sale Akzo Nobel under the trade name Querton 442, with melted DUCK at 70oC, homogenization of the mixture through the second dispersion. the pH of the dispersion was set to about 5 by adding acid. Anionic stabilizer used in this example was a carboxymethyl cellulose, modified with the formation of a substituted amide (MCMC) and containing hydrophobic Deputy derived N-(hydrogenated tallow)-1,3-diaminopropane received in accordance with the description of WO 94/24169. MCMC had a degree of substitution in the carboxy-group of 0.6 and a degree of substitution of hydrophobic groups is 0.1. The dispersion contained particles of DUCK with an average particle size of about 1 μm, which were negatively charged, as shown by the negative Zeta-potential measured using a ZetaMaster S Version PCS. The content of the DUCK in the dispersion was 30%. Variance N 1 contained 3% of a cationic surfactant and 1% anionic stabilizer;% for both substances, calculated on the weight of the DUCK. Variance N 2 contained 7% cationic surfactant and 1% anionic stabilizer;% for both substances, calculated on the weight of the DUCK.

Example 2

Was repeated the same procedure as in example 1, but as anionic stabilizer was used condensed naphthalenesulfonate sodium, manufactured for sale the nom sample were different. Variance N 3 obtained in this example contained 30% DUCK, 6% anionic stabilizer and 4% of a cationic surfactant (concentration of the latter two substances are based on the weight of the DUCK). The dispersion contained DUCK in the form of particles with an average size of about 1 μm, which had a negative charge, determined as described above.

Example 3

The stability of the anionic dispersions obtained in examples 1 and 2 was tested as follows: the dispersion was diluted with water to a concentration of DAK 40 M. D. In some tests was added 10 M. D. stearic acid to increase the content of lipophilic substances and the absorption ability of the cations. The diluted dispersion was placed in a vessel equipped with a device for measuring the turbidity of the medium, the circulation path, a device for circulating, heating and cooling. The investigated volume of the diluted dispersion was circulated in a closed circuit, while automatically recording the turbidity of the medium, and the dispersion was subjected to heating and cooling; the whole temperature cycle lasted 45 minutes the temperature of the dispersion was increased from 20oC-62oC and then decreased again to the 20oC. Hmotnost the tsya measure of the ability of dispersed particles to resist growth by agglomeration and, thus, is a measure of the stability of the dispersion. The change in turbidity of the medium (T) was calculated as: T = (turbidity environment at the end of the/the turbidity of the medium at the beginning)100. The higher T, the higher the stability of the dispersion.

For comparison, we tested two standard variance. Standard 1 was anionic dispersion DUCK, containing dispersant composition comprising the sodium lignosulfonate present in the ion abundance, and cationic starch. Standard 2 was a cationic dispersion DUCK, also containing sodium lignosulphonate and cationic starch, but in this case, the ion abundance attended cationic starch. Table 1 shows the results.

As can be seen from table 1, the values of T for the dispersions according to this invention were significantly higher than for standard dispersions, indicating a higher stability when breeding.

Example 4

This example was determined by the sizing efficiency variances for sizing, obtained in accordance with example 3. Sheets of paper were manufactured according to the standard method SCAN-C23X for laboratory scale. Paper pulp used to produce paper, contained 80% BV>SO410H2O. Paper pulp had a density of 0.5 and pH 8.0. The variance for the sizing was used in conjunction with industrial auxiliary composition CompozilTMcontributing to the removal of water, including cationic starch and modified compounds of aluminum anionic colloidal solution of silicon dioxide, which were added to the pulp separately; cationic starch was added in the amount of 8 kg/ton, calculated on the dry matter of the pulp, and the Sol of silicon dioxide was added in the amount of 0.8 kg/t, based on SiO2and the dry matter of the pulp.

Index values Cobb, measured in accordance with standard TAPPI T 441 OS-63 and the resulting tests are given in table 2. The number of DUCK were calculated on the dry mass of paper pulp.

From the data of table 2 it is possible to conclude that higher efficiency sizing when using dispersions in accordance with this invention.

Example 5

Sizing ability was tested in the same way as in example 4, except that the paper weight as filler contained no chalk, precipitated calcium carbonate and dosage of cationic starch was 12 kg/lots to increase the ability to absorb cations and increase the content of lipophilic substances. The test results are given in table 3.

As can be seen from table 3, the variance N 1 obtained in accordance with this invention, in most cases, gives a much better sizing than the variance of the standard 1 that were used for comparison; much greater degree of sizing is achieved when using a paper pulp containing significant amounts of lipophilic compounds.

Example 6

Anhydrous composition for sizing according to the invention was obtained by dry mixing 93 parts of granulated DUCK, 3 parts of cationic surfactants, the same as in example 1 and 4 parts of anionic stabilizer, the same as in example 2. The obtained dry mixture was then added to hot water and the thus obtained aqueous mixture was heated to 80oC was pumped through the pump creating large shearing force, and then was cooled to room temperature. The resulting anionic dispersion. Variance N 4 contained 20% DUCK with an average particle size of about 1 μm. Sizing ability was tested as in example 4, but the number of cationic starch was 12 kg/ton, based on dry weight of pulp. The result is availa able scientific C with the present invention, provides higher quality sizing.

Example 7

In this series of tests was tested dispersion DAK received in accordance with the invention and consisting of a dispersant composition comprising a cationic surfactant and anionic stabilizer, which is an inorganic substance consisting of microparticles.

The variance was obtained by pre-mixing at the 75oC 0.2 g cocoamine released for sale under the trade name Armeen CTMwhich is a mixture of amines of the formula RNH2where R represents a hydrocarbon residue C12-C18and 1.0 g, calculated as SiO2water Zola silicon dioxide, modified by additions of aluminum, such as described in U.S. patent N 5368833, and then adding 25 g of AIBN and acid to pH 4.0. The aqueous mixture was homogenized using an Ultra Turrax and then cooled. The obtained dispersion, Variance, N 5, contained DAK 25% by weight, and dispersing the composition of anionic character.

The effectiveness of the sizing when using this dispersion was evaluated by the same method as in example 4, using similar paper pulp at a pH of 8.1 and using sravnenie the couple on the weight of dry paper pulp.

Example 8

The variance of DAK received in accordance with the invention, was obtained and tested as in example 7, except that the anionic stabilizer is used in this example was a Sol melamine-sulfonic acid, obtained in accordance with Int. Pat. Appl. Publ. N WO 96/34027. The variance of N (6) was obtained from 0.4 g cocoamine, 2 g of melamine-sulfonic acid, 30 g of AIBN and water in such quantity that the weight of the mixture was 100, the test Results of this dispersion are given in table 6, in which the dosage DUCK are based on the dry weight of the paper pulp.

Example 9

The ease of obtaining dispersions in accordance with the invention was evaluated through preparation of an anionic dispersions DUCK, containing different amounts of DUCK. Dispersions of this invention was obtained by homogenization of the mixture of 0.8% by weight of di(hydrogenated tallow)dimethylammonium chloride, and 1.6% by weight of condensed naphthalenesulfonate sodium, 77,6% by weight water and 20% by weight DUCK for a certain period of time, using a mixer Ultra Turrax at 15,000 rpm and then cooled in the thus obtained dispersion within 2 hours. Similar dispersions were prepared in the same way, but with different content DAK: weight.

Standard dispersion DUCK were obtained for comparison in the same way and under the same conditions by homogenizing a mixture of 1.0% by weight of cationic starch, 0.25 per cent by weight of sodium lignosulphonate, 89% by weight of water and 10% by weight of AIBN. Thus, we have obtained similar dispersions containing different amounts of DUCK; standard dispersion contained 10, 20, 30 and 40% DUCK by weight. These dispersions are marked "standard 3" and then the following number indicates the content of the DUCK in % by weight.

The particle size and viscosity were determined in the usual way. Table 7 summarises the results obtained.

From table 3 it is seen that the dispersion of this invention are obtained easier; they have a lower viscosity at the same content of DUCK, and with the same expenditure of energy on the dispersion of smaller particles, which causes the formation of fewer deposits on the surfaces of the paper machine. Compared with the reference dispersions requires less energy and less shearing force to obtain a dispersion with the same particle size. In addition, the increase of the stirrer speed up to 25,000 rpm reduces the particle size of the dispersions in accordance with izobreteniya chemically active with respect to the cellulose sizing agent and dispersing the composition, characterized in that the dispersant composition comprises a low molecular weight cationic organic compound having a molecular weight less than 10,000, and anionic stabilizer, which is an anionic polyelectrolyte.

2. Aqueous dispersion under item 1, characterized in that the cationic organic compound is present in an amount of 0.1 - 20% by weight, based on the sizing agent and an anionic stabilizer is present in an amount of 0.1 - 20% by weight, based on the sizing agent.

3. Aqueous dispersion under item 1 or 2, characterized in that the cationic organic compound is a cationic surface-active agent.

4. Aqueous dispersion under item 3, wherein the cationic surfactant has a molecular weight of 200 to 800.

5. Aqueous dispersion under item 3 or 4, characterized in that the cationic surfactant is selected from primary, secondary, tertiary and Quaternary ammonium compounds containing at least one hydrocarbon group having 9 to 30 carbon atoms.

6. Aqueous dispersion in PP.3, 4 or 5, characterized in that the cationic surfactant is selected from the dioktyldimethylammonium PI is(fractionated) benzyldimethylammonium chloride, octadecyl the ammonium chloride, dioctadecyl of dimethylammonium chloride, dihexadecyl of dimethylammonium chloride, di(hydrogenated tallow) dimethylammonium chloride, di(hydrogenated tallow) benzylmethylamine chloride, (hydrogenated fat) benzyldimethylammonium chloride, mileydeminiley chloride, di(ethylene hexadecacarbonyl) dimethylammonium chloride and N-octadecyl-N-dimethyl-N'-trimethyl-propylene-diammonium dichloride.

7. Aqueous dispersion under item 1 or 2, characterized in that the cationic organic compound is a cationic polyelectrolyte.

8. Aqueous dispersion according to any one of the preceding paragraphs, wherein the anionic stabilizer is an organic compound.

9. Aqueous dispersion according to any one of paragraphs.1 to 7, characterized in that the anionic stabilizer is an inorganic substance, based on silicon dioxide.

10. Aqueous dispersion in PP.1, 2 or 8, characterized in that the anionic stabilizer is selected from anionic polyurethanes, condensed naphthalenesulfonates, polymeric anionic compounds, which are based on polysaccharides, vinyl polymers formed from monomers with anionic groups, optional the C.

11. Aqueous dispersion according to any one of the preceding paragraphs, characterized in that the dispersion is anionic.

12. Aqueous dispersion according to any one of the preceding paragraphs, wherein the sizing agent is a dimer of ketene or acid anhydride.

13. Aqueous dispersion according to one of paragraphs.1 - 12, characterized in that it is used as a sizing agent for processing in mass or as a sizing agent for surface treatment in the manufacturing process of paper.

14. Aqueous dispersion under item 1, characterized in that the cationic organic compound is a cationic organic surface-active agent having the General formula R4N+X-in which each R group is selected from (i) hydrogen, (ii) hydrocarbon groups having from 1 to about 30 carbon atoms, and (iii) hydrocarbon groups having up to about 30 carbon atoms, interrupted by one or more heteroatoms and/or groups containing a heteroatom; where X-represents an anion or anionic group present in the anionic compound dispersant, at least one of these R groups contains at least 7 carbon atoms.

1 the ore 9 carbon atoms.

16. A method of obtaining a water dispersion of chemically active with respect to the cellulose sizing agent, which is homogenized in the presence of the aqueous phase and dispersing the composition, characterized in that the dispersant composition comprises a low molecular weight cationic organic compound having a molecular weight less than 10,000 and anionic stabilizer, which is an anionic polyelectrolyte.

17. The method according to p. 16, characterized in that the cationic organic compound is formed from organic ionized polymer with a primary amino group or a primary amine in which the corresponding cationic ammonium derivative formed in the process of implementation of this method.

18. The method according to p. 16, characterized in that it includes obtaining practically anhydrous composition containing chemically active with respect to the cellulose sizing agent, a cationic organic compound and an anionic stabilizer, and homogenization of the composition in the presence of the aqueous phase.

19. Method for the production of paper by adding a water dispersion of a sizing agent to the processed raw materials containing cellulose fibers and the optional napolnitelyami is a water dispersion according to any one of paragraphs.1 - 15.

20. The method according to p. 19, wherein the white water recycle in the process and select add fresh water to form a mass containing cellulose fibers, followed by the separation of water, and fresh water is injected in the amount of less than 30 tons per 1 ton of produced paper.

21. Practically anhydrous composition containing chemically active with respect to the cellulose sizing agent and a cationic organic compound, characterized in that the cationic organic compound has a molecular weight of less than 10,000, in addition. the composition contains an anionic stabilizer, which is an anionic polyelectrolyte.

22. The composition according to p. 21, characterized in that the cationic organic compound is present in an amount of 0.1 - 20% by weight and the anionic stabilizer is present in an amount of 0.1 - 20% by weight, both calculated on chemically active with respect to the cellulose sizing agent, in which the total charge of the cationic compound and an anionic stabilizer is negative.

23. The composition according to p. 21 or 22, characterized in that it is used to obtain a water dispersion of chemically active with respect to the cellulose sizing agent according to any one of paragraphs.1 - 15

 

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