Sizing of paper

 

(57) Abstract:

The invention is intended for use in paper production. Relates to a method for sizing cellulose fibers by adding aqueous sizing dispersion containing Cellulosics active sizing substance to the mass containing cellulose fibers and, optionally, fillers, dehydration of the mass on the grid to obtain a ribbon of cellulose fibers. The dispersion contains hydrophobic-modified dispersing agent containing one or more anionic groups, and the mass has a high cationic demand of at least 50 mkaku/l of filtrate mass. The invention also relates to a practically anhydrous composition containing Cellulosics active sizing agent and an anionic hydrophobically-modified cellulosebased, receive his blessing. Provided improved stability and sizing. 5 C. and 17 C.p. f-crystals, 2 tab.

The present invention relates to the sizing of paper and more particularly to aqueous dispersions containing Cellulosics active sizing agent and a hydrophobic-modified dispersant substances, their preparation and application.

Cellulosics active sizing agent usually provide a good sizing at lower dosages sizing agent. However, it is found experimentally that the efficiency of ordinary Cellulosics active sizing substances below, when their skin is Vesnik extractables, such as resin acids, fatty acids, fatty esters, triglycerides, etc. Due to the anionic nature of lipophilic substances containing carboxylate or carboxylic acid groups, mass, containing a significant amount of extractable lipophilic substances usually have a slightly higher cationic demand. Found that lipophilic substances can have a negative effect on the adsorption of sizing substances on the fibers, which can lead to poor sizing. To improve the sizing of such masses, paper manufacturers have to increase the dosage a sizing agent, which of course cost less favorably and may increase the accumulation of a sizing agent in the circulating water, recycled paper production. These problems are even more serious for pulp and paper mills, which are intensive recirculation circulating water using process only a small additives of fresh water, thereby further increasing the cationic demand and the accumulation of lipophilic extractives and not keeping a sizing substance in the circulating water and dehydrated mass.

the CSOs sizing agent and processes carried out with improved sizing, in which the dispersion Cellulosics active sizing agent used with pulp mass, meet the requirement of high cation content and/or high content of lipophilic extractives and/or processes intensive recirculation circulating water.

THE INVENTION

In accordance with the present invention found that an improved sizing is achieved by using aqueous dispersions Cellulosics active sizing agent containing hydrophobic-modified dispersing agent, internal sizing of the masses that meet the requirement of high cationic demand and/or high content of lipophilic substances. It is established that improved sizing can be achieved with the use of such dispersions in the production of paper, which involves the recirculation of cooling water, thereby creating conditions of high cationic demand or high content of extractable lipophilic substances. Accordingly, the invention generally relates to the use of aqueous sizing dispersion containing cellulosome is the sizing of the complex for sizing masses by adding a sizing dispersion to mass, containing cellulose fibers and, optionally, fillers, dehydration of the mass on the grid to obtain a layer containing cellulose fibers or paper. In accordance with the first aspect of the invention, the mass must satisfy the requirement of the content of cations is equal to at least 50 mkaku/l of filtrate mass. In accordance with the second aspect of the invention, the content of lipophilic substances in the mass is equal to at least 10 million shares. The third aspect of the invention includes the dehydration of the mass on the grid of receipt of the circulating water and tapes containing cellulose fibers, recycling of water and, optionally, the introduction of fresh water to obtain a mixture of dehydrated pulp fiber, and fresh water consumption is less than 30 tons per ton of produced dry pulp product. Thus, the invention relates to the use of aqueous sizing dispersion containing Cellulosics active sizing agent and a hydrophobic-modified dispersing agent, in the process of sizing cellulose fibers, as further defined in the claims.

In the preferred embodiment of the present invention aqueous dispersion soderman substance, in particular anionic hydrophobic-modified cellulosebased, and the present invention additionally relates to such a dispersion and its preparation, as further defined in the claims. The variance provides improved stability and sizing, which is especially important when applying the paper weights with their high demand cations and containing lipophilic substances, only with a high degree of circulation of the circulating water.

The invention allows to produce paper with improved sizing in comparison with the existing sizing dispersions with appropriate dosage Cellulosics active sizing agent and to use a lower dosage Cellulosics active adhesive to achieve the same degree of sizing. The possibility of using lower amounts of sizing agent to achieve the desired sizing reduces the risk of accumulation readsorbing sizing agent in the circulating water recirculating in the process, thereby reducing the risk aggregation and deposition sizing agent in paper production. The invention thus provide kleevage substance according to the present invention can be selected from any Cellulosics active sizing substances, known in the art. Suitable sizing material selected from the group containing a hydrophobic dimer katenov, oligomers of Ketanov, acid anhydrides, organic isocyanates, carbamylcholine and mixtures thereof, preferably dimers of Ketanov and anhydrides of the acids, most preferably dimers of Ketanov. Acceptable dimer Ketanov have the General formula (I) below, where R1and R2mean saturated or unsaturated hydrocarbon group, typically a saturated hydrocarbon, a hydrocarbon group, suitably containing from 8 to 36 carbon atoms, usually unbranched or branched alkyl group containing 12 to 20 carbon atoms, such as hexadecyl and octadecyl group. Acceptable acid anhydrides meets formula (II), where R3and R4that may be the same or different and represent saturated or unsaturated hydrocarbon group, an acceptable containing from 8 to 30 carbon atoms, or R3and R4together with-C-O-C - residue may form a 5 - or 6-membered ring, optionally additionally saturated hydrocarbon groups containing up to 30 carbon atoms. Examples of anhydrides of acids that are used in industry include alkyl and eye dimers of Ketanov, anhydrides of acids and organic isocyanates include compounds disclosed in U.S. patent N 4522686, which is included in the description by reference. Examples of acceptable carbamoylation include those disclosed in U.S. patent N 3887427 and also incorporated herein by reference.

In addition Cellulosics active sizing agent sizing dispersion can also contain Metallurgichesky active sizing agent. Examples of acceptable sizing substances specified type resin include a sizing agent, for example koncentrirovannaya and/or esterified resins, waxes, derivatives of fatty acids and rosin acids, such as fatty amides and fatty esters, such as complex glycerin truefire natural fatty acids.

The dispersion used in accordance with the present invention contains a hydrophobic-modified dispersing agent, that is, dispersing agent having one or more hydrophobic groups. Preferably, the hydrophobic group is suspended, that is attached to the dispersing substance in the form of a hydrophobic side chain. Examples of eligible groups include hidrovo the ome 30 carbon atoms, in particular hydrophobic amido, ester and ether substituents, including saturated or unsaturated hydrocarbon chain of at least 4, acceptable to at least 6 and preferably from 8 to 30 carbon atoms, randomly bursting with heteroatoms, such as oxygen or nitrogen, and/or a group containing a heteroatom, carbonyl or alloctype. Dispersing agent may be hydrophobic degree of substitution (DSH) from 0.01 to 0.8, acceptable from 0.02 to 0.5 and preferably from 0.03 to 0.4.

Hydrophobic-modified dispersing agent may have a charge or be neutral, preferably it is the charge and contains one or more ionic groups of the same or of different types. The ionic groups can be cationic and/or anionic. Accordingly, the dispersing agent may be in the nature of anionic, amphoteric or cationic, preferably an amphoteric or anionic, most preferably anionic. Acceptable anionic groups include sulfate groups, and carboxyl, sulfonic, phosphoric and phosphonic acid groups which may be present in the form of the free acid or in the form of a water-soluble ammonium salts or salts of alkaline mesteban ion replacement changing in a wide range; the degree of anionic substitution (DSAmay be in the range from 0.01 to 1.4, acceptable from 0.1 to 1.2 and preferably from 0.2 to 1.0. The degree of cationic substitution (DSKmay be in the range from 0.01 to 1.0, acceptable from 0.1 to 0.8 and preferably from 0.2 to 0.6.

Dispersing agent may be derived from synthetic or natural substances and is preferably soluble or dispersible in water. Examples of acceptable dispersing substances include hydrophobically - modified polysaccharides, such as starches, guar gums, cellulose, chitina, chitinase, glikana, galactanes, glucan, xanthan gum, mannans, dextrins, and so on, preferably starches, guar gums and cellulose derivatives, preferably anionic and cationic derivatives, and preferably anionic derivatives, such as phosphated, sulphonated and karboksilirovanie polysaccharides, hydrophobically - modified products of polycondensation, such as, for example, anionic and cationic polyurethane, cationic polyamidoamine; hydrophobically modified anionic and cationic vinyl polymers obtained stepwise polymerization, such as, for example, p the bathrooms synthetic polymers can be easily obtained by the use in the polymerization of monomers, containing hydrophobic Deputy, for example hydrophobic chain alkyl(meth)acrylamide and (meth)acrylates, ministart and so on, any of anionic and/or cationic monomers.

Examples of acceptable hydrophobic modified and charged dispersant substances include those disclosed in U.S. patent N 4228217, N 4239592 and N 4687519; in European patent applications N 512318 and N 551817; and international publication of patent application N WO 94/12168, which are incorporated herein as references. Used in accordance with the present invention, the dispersion can be prepared in a standard way with the difference that as the dispersing substance is used hydrophobic - modified substance.

The content of the hydrophobic-modified dispersant substance in the dispersion may vary within wide limits and depends, inter alia, on the type of material and its DSHand in the presence of charge, from DSADSCthe type of sizing agent, the required anionactive, cationactive and content of the solids obtained dispersion.

The content of the hydrophobic-modified dispersant substance in the dispersion can reach up to 100 wt.%, usually from 0.1 to 20 mA preferred embodiment of the present invention, a sizing dispersion contains hydrophobic-modified dispersing agent, above, and surfactant. This surfactant, if used, may be anionic, nonionic or cationic in nature. Applied surfactants preferably should have HLB values in the range of from about 8 to about 30 or higher, preferably from about 8-25.

Acceptable cationic surfactants include any cationic compound that can function as a surfactant and/or as a combination of substances between the particle or droplet sizing agent and a hydrophobic-modified derivative of cellulose. Preferred surfactants include Quaternary ammonium compounds of General formula R4N+X-where each of the R groups is independently selected from the group comprising (i) hydrogen, (ii) a hydrocarbon group, preferably aliphatic, preferably alkyl groups containing from 1 to about 30 carbon atoms, preferably from 1 to 22 carbon atoms; and (iii) a hydrocarbon group, preferably aliphatic, preferably alkyl groups with carbon atoms to about 30, preferably from 4 to 22, with the inclusion of one or neskolkih; acceptable at least three and preferably all of these R groups containing a carbon atom; suitable for at least one and preferably at least two of these groups, containing at least 9 carbon atoms and preferably at least 12 carbon atoms; and where X-represents an anion, typically a halide, for example chloride. Examples of acceptable surfactants include dioctyldimethylammonium, didecyldimethylammoniumchloride, dioctylmaleate, cocobenzyldimethylammoniumchloride, Coco (fractionated) benzyldimethylammonium, octadecyltrimethylammonium, dioxidecontaining, dihexadecylnaphthalene, di(hydrogenomonas tall oil)dimethylammoniumchloride, di(hydrogenomonas tall oil) benzyldimethylammonium, (hydrogenomonas tall oil) benzyldimethylammonium, mileydeminiley and di (ethylene hexadecacarbonyl)dimethylammoniumchloride. Particularly preferred cationic surfactants that contain at least one hydrocarbon group with the number of carbon atoms from 9 to 30, and particularly Quaternary ammonium compounds. Bol is onevia connection containing at least one hydrocarbon group, an acceptable aliphatic, preferably alkyl, 9-30 carbon atoms, preferably 12 to 22 carbon atoms. Examples of acceptable surfactants of this type include N-octadecyl-N-dimethyl-N'- trimethyl-Propylenediamine dichloride. Acceptable cationic surfactant has a molecular weight in the range from about 200 to about 800. Acceptable anionic surfactants include alkyl, aryl and alkylarylsulfonate and sulfates ethers, the alkyl, aryl and alkylaryl carboxylates, alkyl, aryl and alkylaryl the sulfonates, the alkyl, aryl and alkylaromatic and phosphate ethers, and diallylmalonate, and altergroup contain from 1 to 18 carbon atoms, airgroup contain from 6 to 12 carbon atoms, and alkylaryl contain from 7 to 30 carbon atoms. Acceptable anionic surfactants include sodium laurylsulfate and sodium dodecylbenzensulfonate.

Surfactant can be used in the dispersion in amounts of from 0.1 to 20 wt.%, acceptable from 1 to 10 wt.% and preferably from 2 to 7 wt. percent, based on the sizing agent. In a preferred example, about the Noah surfactant. Preferably, this sizing dispersion is anionic in nature, i.e., anionic dispersing agent is ionic abundance. In accordance with another preferred embodiment, a sizing dispersion contains a cationic hydrophobic-modified dispersing agent and anionic surfactant. Preferably, this sizing dispersion is a cationic, i.e. cationic dispersing agent is present in ion abundance.

Sizing dispersion can be added to the pulp in a standard way. The term "paper" as used in the text refers not only to paper but also to all types of cellulose-containing products in the form of sheets and rolls, including, for example, plates, paper and cardboard. The mass contains cellulose fibers, optionally, in combination with mineral fillers, and usually the content of the cellulose fibers is at least 50 wt.%, dry raw materials. Examples of mineral fillers standard type include kaolin, porcelain clay, titanium dioxide, gypsum, talc and natural and synthetic calcium carbonates such as chalk, ground marble and precipitated calcium carbonate. The approach is 01 to 1.0 wt.%, calculated on dry weight of cellulosic fibres and optional fillers, preferably from 0.05 to 0.5 wt.%, at this dose significantly depends on the quality of the pulp or create more gluing paper applied sizing agent and the desired degree of sizing.

Sizing dispersion applied to the sizing of the pulp, which has a high cationic demand and/or contains significant amounts of lipophilic materials, such as pulp, made from certain varieties perioodilisi and recycle pulps, such as intensive recirculation of cooling water. Usually, the need for cationic activity is at least 50, acceptable at least 100 and preferably at least 150 mkaku/l of filtrate mass. The need for cationic activity can be measured in a standard way, for example, by using a detector of charged particles Muteka using the filtrate mass obtained from the raw mass on the filter 1,6 µm and poly(diallyldimethylammonium chloride) as litrovogo solution. The content of lipophilic substances may be at least 10 million shares, usually at least 20 million shares, acceptable at least 30 million shares and prefer fashion. Besides these dispersions are preferably used in producing of paper, characterized by intense recirculation of cooling water, i.e. with a high degree of circulation of the circulating water, for example, where it is used from 0 to 30 tons of fresh water per tonne of produced dry paper, usually less than 20 acceptable less than 15, preferably less than 10 and in particular less than 5 tons of fresh water per tonne of paper. Recycling recycled water in the process is preferably carried out by mixing recycled water and cellulose fibers, preferably in the form of mass or suspension, before or after adding a sizing dispersion, for example, to get dehydrated mass. Fresh water can be introduced into the process at any stage; for example, it can be mixed with cellulose fibers to obtain the mass, and it can be mixed with the material containing cellulose fibers, for dilution, as the resulting thickened mass, before or after mixing the mass with circulating water and before or after addition of the sizing dispersion.

In combination with these sizing dispersions of course can be applied chemicals are usually added in paper manufacture in mass, such as providing SOH is counteracted substances, and so D. Examples of aluminum compounds include aluminum alum, aluminates and semi-aluminum compounds, such as polyaluminium and sulfates. Examples of acceptable restraint devices include cationic polymers, anionic inorganic substances in combination with organic polymers, such as bentonite in combination with cationic polymers, silicasol in combination with cationic polymers or cationic and anionic polymers. Especially good sizing of the mass can be achieved when using the dispersions according to the invention in combination with retaining means comprising cationic polymers. Acceptable cationic polymers include cationic starch, guar gum, acrylates and polymers on the basis of acrylamido, polyethylenimine, dicyandiamide-formaldehyde, polyamine, polyaminoamide and poly(diallyldimethylammonium chloride), and combinations thereof. Preferably used cationic starch and cationic polymers based on acrylamide, either separately or in combination with each other or with other substances. In accordance with a preferred embodiment of the invention dispersion is used in conjunction with the prison system, containing at least one cationic polymer vremenno with the addition of the cationic polymer or polymers. It is also possible premixing sizing dispersion with protective tools, such as a cationic polymer such as cationic starch or cationic polymer based on acrylamide, or anionic substance on the basis of silicon dioxide, before the introduction of the thus obtained mixture in mass.

In a preferred example of the present invention aqueous dispersion contains Cellulosics active sizing substance, as defined above, and anionic hydrophobic-modified cellulosebased, and the invention also relates to such a dispersion to obtain that further defined in the claims. These dispersions are preferably anionic. Acceptable cellulosebased include any compound, derivative of cellulose, which is anionic and hydrophobic-modified and can act as dispersing substances or stabilizer. Cellulosebased preferably is a water-soluble or water-dispersible. Cellulosebased contains one or more hydrophobic groups. Examples of eligible groups include hydrophobic substituents containing from 4 to about 30 atoms coal is or unsaturated hydrocarbon chain with at least 4, acceptable at least 6 and preferably from 8 to 30 carbon atoms, and arbitrarily entered into it by one or more heteroatoms, for example oxygen or nitrogen, and/or groups containing a heteroatom, for example carbonyl or aryloxy. Preferred inorganic salts of fatty modified cellulose. Cellulosebased may have a hydrophobic degree of substitution (DSH) from 0.01 to 0.8, acceptable from 0.02 to 0.5 and preferably from 0.03 to 0.4. Hydrophobic-modified cellulosebased is anionic and contains one or more anionic groups are the same or different type, preferably it is polyanionic. Acceptable anionic groups, i.e. groups that are anionic or shown in the anionic state in water, include sulfate groups and carboxylic groups, sulfonic, phosphoric and phosphonic acids which may be present as free acid or water soluble salts of ammonium or alkali metal (usually sodium). The anionic group may be introduced by chemical modification of the known method. Cellulosebased has a degree of anionic substitution (DSA) from 0.1 to 1.4, acceptable from 0.4 to 0.9, and preferably from 0.5 to 0.8. Cellulosebased cellulosebased of the present invention include hydrophobic modified and arbitrarily charged, preferably anionic cellulosebased selected from carboxymethylcellulose (CMC), mixed ethers of cellulose CMC, such as hydroxyethylaminomethyl cellulose (HECMS), hydroxypropyl carboxymethyl cellulose (HPCMS), dihydroxypropyl carboxymethyl cellulose (PHPCMS), Quaternary nitrogen-containing carboxymethylcellulose (CACMS), such as CMC, the esterified glycidyl dialkylammonium, carboxymethyl ethylsulfonyl cellulose (CMAST), methylcarboxymethylcellulose (MCMC), etc. are Particularly preferred fatty amidon modified carboxyl containing cellulose, such as fatty amidon modified carboxymethylcellulose (ACMC). Acceptable hydrophobic-modified cellulosebased and how the introduction of hydrophobic substituents in anionic cellulosebased disclosed, for example, in international publication of patent application N WO 94/24169, which is included in the description by reference.

Hydrophobic-modified cellulosebased may be present in the dispersion in an amount up to 100 wt.%, usually from 0.1 to 20 wt.%, acceptable from 0.2 to 10 wt.% and preferably from 0.3 to 6 wt.%, per Cellulosics active sizing matter what uranium solid particles and also exhibit good stability during storage. The present invention offers a sizing dispersion with improved stability during storage and/or high solids content. These dispersions generally contain a sizing substance is from about 0.1 to about 45 wt.%. A dispersion containing as a sizing agent dimer of ketene, in accordance with the present invention may contain a dimer of ketene in the range of 5 to 45 wt.% and preferably from about 10 to about 35 wt.%. Dispersion, or emulsion containing as a sizing agent, the acid anhydride, in accordance with the invention may contain an acid anhydride in the range from 0.1 to about 30 wt.% and preferably from about 5 to about 20 wt.%.

Dispersion of the present invention can be prepared by mixing the aqueous phase with a dispersing agent and a sizing agent and, optionally, surface-active agent, preferably at a temperature at which a sizing agent is liquid, and homogenizing the thus obtained mixture, acceptable under pressure. Allowable temperature for ketenimine sizing agent are in the range from approximately 55oC up to 95oC, then which drops contains a sizing agent is typically a diameter of from 0.1 to 3 μm, then cooled. In addition to the above-mentioned components in the composition of the sizing dispersions can also contain other materials, such as, for example, dispersing agents and stabilizers, fillers such as urea and urea derivatives, and antioxidants.

Also found that the components of the dispersions easily homogenizers in the presence of the aqueous phase. So another way to obtain the dispersion includes (i) mixing Cellulosics active sizing agent with the anionic cellulosebased and, optionally, surface-active agent to produce an intermediate composition, (ii) homogenization of intermediate composition in the presence of the aqueous phase, as described above. Preferably, the components are homogeneous mix on stage (i). Used in stage (i) a sizing substance can be solid, although it is preferable liquid substances that are easier to provide a homogeneous mixture. If necessary, after the stage of mixing (i) you can delete the intermediate composition and, optionally, cooling for solidification, obtaining substantially anhydrous sizing composition to simplify and reduce the cost of its transportation. In the target application, or in another place, ditrani, at elevated temperature, to convert the intermediate sizing composition in the liquid state. This method is especially attractive in the preparation of the dispersions of the dimer Ketanov and anhydrides of the acids, the latter is usually prepared in the pulp and paper industry in direct connection with their use as a sizing agent in paper production. Creating stable when stored virtually anhydrous sizing composition thus provides a significant economic and technical benefits. Thus, the present invention also relates to a practically anhydrous sizing composition comprising Cellulosics active sizing agent and an anionic hydrophobically-modified cellulosebased and, optionally, surface-active substance, its preparation and application, as further defined in the claims.

Components that are part of the present invention, that is, Cellulosics active sizing agent and an anionic hydrophobically-modified cellulosebased and, optionally, surfactant, preferably correspond to the definition above. The composition practi may be in the range from 0 to 10 wt.%, suitably less than 5 wt.% and preferably less than 2 wt.%. Most preferably the complete absence of water. The composition preferably contains Cellulosics active sizing substance dominant quantities, in mass terms, that is at least 50 wt.%, acceptable composition contains a sizing agent in the range from 80 to 99.9 wt.% and preferably from 99 up to 99.7 wt.%. Cellulosebased may be present in the sizing composition in the quantities specified above for dispersions, in which the interest is classified as a sizing material. Anionic cellulosebased may also enter into the composition in an amount up to 100 wt.%, usually from 0.1 to 20 wt.%, suitably from 0.2 to 10 wt.% and preferably from 0.3 to 6 wt. % referred to a sizing substance. When applying, surface-active substance, which is acceptable cationic surface-active agent, may enter into the composition in an amount from 0.1 to 20 wt.%, acceptable from 1 to 10 wt.% and preferably from 2 to 7 wt.%, classified as a sizing agent, and the total charge of surfactants and anionic cellulosebased in the composition preferably is anionic or negative.

Proclaime the Loozen fibers of any type, and can be used for surface sizing and internal sizing of the mass. The present invention also relates to a method for producing paper, in which the aqueous dispersion in accordance with the definition above is used as a surface or internal sizing agent. With a reasonable amount of Cellulosics active sizing agent, or added to the mass of cellulose fibers, and, optionally, filler, or applied to the paper surface as a surface sizing agent, usually in the sizing press is from 0.01 to 1.0 wt. % (based on dry weight of cellulosic fibres and optional fillers, preferably from 0.05 to 0.5 wt.%, the dosage depends mainly on the quality of the pulp or create more gluing paper used Cellulosics active sizing agent and the desired degree of sizing.

Dispersion of the present invention is particularly suitable for internal sizing of cellulose pulp, in which the mass must have a high cationic demand and/or contain significant amounts of lipophilic substances. Acceptable levels of needs cations, the soda is x2">

The present invention is additionally illustrated by the following examples which, however, should not be construed as limiting thereof. Unless expressly stated, parts and percentages relate respectively to the parts of the mass and the percent mass.

EXAMPLE 1

Dispersion of alkylenediamines (AAA) of the present invention is prepared by mixing a solution of anionic hydrophobic-modified cellulosebased with molten AAA at 70oC, passing the mixture through a homogenizer and then cooling the thus obtained dispersion. Acid to bring the pH of the dispersion to about 5.

The variance of N 1 is prepared from anionic fatty amidon modified carboxymethylcellulose (ACMC) containing hydrophobic Deputy derived from N-hydrogenated, Talla-1,3 - diaminopropane prepared in accordance with WO 94/24169. HCMC has a degree of carboxyl substitution, equal to 0.6, and the hydrophobic degree of substitution of 0.1. The dispersion containing the AAA particles having an average size of about 1 μm, contains 30% AAA and 1.5 wt.% HCMC per AAA.

The variance of N 2 are prepared in accordance with the description above, except that when the homogenization is also used cationic surface is a trademark Querton 442, Akzo Nobel. The dispersion contains AAA particles having an average size of about 1 μm, anionic charged, as determined by a negative Zeta-potential, which is defined by BetaMaster S model PCS. The content of AAA is 30%. Variance N 2 includes 3 wt. % cationic surfactant and 1 wt.% HCMC, both assigned to AAA.

EXAMPLE 2

In this example, we evaluate the effectiveness of the sizing for the variance N 1 of example 1. Also prepare anionic AAA dispersion using carboxymethyl cellulose as a dispersing agent (5 wt.% CMC assigned to AAA), and conduct comparative tests. This dispersion, EUR. 1, shows poor stability and therefore should be used immediately after preparation.

Paper sheets are produced in accordance with the standard method SCAN-C23X laboratory tests. Use a lot of paper containing 80% 60:40 bleached birch/pine surfaccuracy and 20% of chalk, to which is added 0.3 g/l Na2SO410H2A. Consistency of mass equal to 0.5% and pH 8.0. Apply a sizing dispersion in combination with industrial retention system and water separation, CompozilTMincluding cationic brahmavamso in the amount of 8 kg/t, based on the dry mass, and silicasol added at the rate of 0.8 kg/t, defined as SiO2on a dry mass.

Coobb value, measured in accordance with TAPPI standard T 441-OS-63, shown in table 2. Dose AOD calculated on dry basis.

Table 1 illustrates the improvement in the sizing of paper, can be achieved with the use of anionic sizing dispersion according to the present invention.

EXAMPLE 3

The effectiveness of sizing according to example 1 of dispersion N 2 evaluate and compare relative standard anionic dispersion of AAA, EUR. 2, containing a dispersing system comprising a lignosulfonate sodium and cationic starch, in which langoulant ion is present in excess.

The procedure of example 2 is repeated except that the mass as a filler instead includes chalk, precipitated calcium carbonate, and dosage of cationic starch is 12 kg/ton, based on dry weight. In some experiments to mass add of 10 million shares of stearic acid to increase the cationic demand and content of lipophilic substances in the mass and to create conditions similar to those that occur in intensive recirculation circulating water. The results civet significantly improved sizing, than anionic dispersion N 2, used for comparison, and significantly better sizing effect is achieved when the weight provides a higher need for cations and contains a substantial amount of lipophilic substances.

1. The method of sizing cellulose fibers by adding aqueous sizing dispersion containing Cellulosics active sizing substance to the mass containing cellulose fibers and, optionally, fillers, dehydration of the mass on the grid to get the tape of cellulose fibers, wherein the sizing dispersion further comprises a hydrophobic-modified dispersing agent containing one or more anionic groups, and the mass has a high cationic demand of at least 50 mkaku/l of filtrate mass.

2. The method according to p. 1, characterized in that the content of lipophilic substances in the mass is at least 10 million shares.

3. The method according to p. 1 or 2, characterized in that the cationic demand of mass equal to at least 100 mkaku/l of filtrate mass.

4. The method according to PP.1, 2 or 3, characterized in that the content of lipophilic substances in the mass is equal to at least 50 million shares.

the which comes to recycling, and, at the discretion of the injected fresh water to get the mass, containing dehydrated pulp fiber, and enter the amount of fresh water should be less than 30 tons per ton of produced pulp product.

6. The method according to p. 5, characterized in that an input of fresh water is less than 10 tons per ton of produced pulp product.

7. The method according to any preceding item, wherein said hydrophobic-modified dispersing agent is anionic.

8. The method according to any preceding paragraph, wherein the basis of the hydrophobic-modified dispersant substance is a polysaccharide.

9. The method according to any preceding item, wherein said hydrophobic-modified dispersing agent is an anionic hydrophobically-modified derivative of cellulose.

10. The method according to PP.1, 7, 8 or 9, characterized in that the hydrophobic-modified dispersing agent contains suspended hydrophobic group with the number of carbon atoms of 6 to 30.

11. The method according to any preceding paragraph, wherein the sizing agent is ketonovy dimer or acid anhydride.

13. Aqueous dispersion under item 12, characterized in that cellulosebased includes a hydrophobic group containing 4 to 30 carbon atoms.

14. Aqueous dispersion under item 12 or 13, characterized in that cellulosebased includes a hydrophobic amide, hydrophobic ester or hydrophobic simple ether Deputy containing saturated or unsaturated chain with at least 8 carbon atoms, optionally comprising one or more heteroatoms and/or one or more groups containing a heteroatom.

15. Aqueous dispersion in PP.12, 13 or 14, characterized in that cellulosebased is bold amidon modified carboxymethylcellulose.

16. Aqueous dispersion in PP.12, 13, 14 or 15, characterized in that the sizing substance is ketonovy dimer or acid anhydride.

17. Aqueous dispersion according to any one of paragraphs.12-16, characterized in that the dispersion is anionic.

18. The method of sizing cellulose fibers of the mass, which includes adding the dispersion to the mass containing cellulose fibers, characterized in, waiting for the implementation of the homogenization Cellulosics active sizing agent in the presence of the aqueous phase, wherein the homogenization is carried out in the presence of anionic hydrophobically modified cellulosebased.

20. The method according to p. 19, characterized in that it includes obtaining practically anhydrous composition containing Cellulosics active sizing agent and an anionic hydrophobically-modified cellulosebased, and homogenization of the composition in the presence of the aqueous phase.

21. Practically anhydrous composition containing Cellulosics active sizing substance, characterized in that it additionally contains an anionic hydrophobically-modified cellulosebased.

22. The composition according to p. 21, characterized in that Cellulosics active sizing substance is a dimer of ketene and the basis of anionic hydrophobic-modified cellulosebased is carboxymethylcellulose.

 

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FIELD: method for inner sizing of cardboard for packing of liquid products, water-repellent adhesive substance for inner sizing, cardboard for packing of liquid products, package for liquid products and use of adhesive substance for inner sizing.

SUBSTANCE: the adhesive substance for inner sizing includes the derivative of oxytanon of formula (1), typically 2-oxytanon of formula (II). Formulae (I), (II) are given in the invention description. In the derivative of oxytanon of formula (I) n has the value from 0 to 6. In formulas (I) and (II) R represents hydrogen or linear hydrocarbon chain, and R`, R``, R``` represent hydrocarbon chains: R` and R`` are mainly obtained from non-branched linear fatty acids, R```-linear or branched alcyl chain or acyclic alcyl chain.

EFFECT: provided improved method for inner sizing of cardboard for packing of liquid products, improved cardboard for packing of liquid products, package for liquid products manufactured from such a cardboard.

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FIELD: food industry; packing.

SUBSTANCE: invention relates to packing material containing base paper or cardboard layer for packing container formed by bending and welding the sheet, or flat blank of packing material. Laminated packing material has base paper or cardboard layer and outer coatings from both sides of base layer made of thermoweldable polymer impermeable to liquids. Said paper or cardboard base layer is made water-repelling by sizing the mass by water dispersoid solution or emulsion of alkylketene dimer or mixture of alkylketene dimers so that content of alkylketene dimer (dimers)in base layer is from 0.25 to 0.4 by dry weight, weight %. Invention contains description of method of manufacture of laminated material and packing container to be sterilized.

EFFECT: provision of laminated packing material protected from penetration of hot steam or liquid designed for packing food products and capable of withstanding heat treatment in autoclave at high humidity and temperature without separation of packing material into layers.

6 cl, 2 dwg

FIELD: production of cardboard for manufacture of packages for liquids.

SUBSTANCE: method involves treating fibrous mass designated for preparing of cardboard with percarbonic acid used in an amount of 0.5-5 kg per t of dry fibrous mass on conversion to 100%-concentration of percarbonic acid; thereafter or simultaneously with indicated treatment process, providing gluing-through by combining resin-based and neutral adhesives; forming cardboard.

EFFECT: reduced moisture-permeability and improved quality of gluing-through of cardboard.

11 cl, 3 tbl, 3 ex

Dispersion // 2309213

FIELD: paper-and-pulp industry.

SUBSTANCE: invention provides aqueous dispersion, method of preparing it, use of dispersion, and a paper manufacturing process comprising internal sizing and surface sizing of paper. Aqueous dispersion contains at least one cellulose-reactive sizing agent selected from group consisting of ketene dimers and multimers, at least one cellulose-unreactive sizing agent, and at least one emulsifier selected from group consisting of oxyalkylene phosphate and sulfate esters and their salts. Dispersion preparation method comprises joining together sizing agents with at least one emulsifier in presence of water to form mixture, which is then homogenized to form aqueous dispersion. Paper manufacturing process comprises forming paper sheet from pulp containing cellulose fibers and depositing said aqueous dispersion thereon. Paper manufacturing process also comprises adding said aqueous dispersion to pulp containing cellulose fibers and dehydrating pulp on screen to produce paper.

EFFECT: increased stability of dispersion and efficiency of outside and internal sizing.

18 cl, 4 tbl, 4 ex

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