The aqueous dispersion of hydrophobic material
(57) Abstract:The invention is intended for use in the pulp and paper industry for sizing cellulose fibers. Relates to aqueous dispersions containing dispersant and dispergirovannoyj phase containing a hydrophobic sizing agent. Dispersant include anionic compound having a molecular weight below 50,000 and selected from carbon-containing compounds and silicon-containing compounds, and cationic organic compound having a molecular weight below 50000. Relates to a method of preparing the dispersion, and anhydrous composition containing the above components. Provided superior stability properties and the viscosity of the dispersion. 3 C. and 15 C.p. f-crystals, 3 tables. The present invention relates to aqueous dispersions of hydrophobic material and more particularly to dispersions having a system dispersant containing two oppositely charged compounds, their preparation and use.Background of the invention
The aqueous dispersion of hydrophobic material is well known and used in numerous applications. For example, in the manufacture of paper water dispersion hydrophobic is that the degree of resistance to wetting and penetration of aqueous liquids. Examples of hydrophobic materials, which are widely used as a sizing means include reactive with respect to the cellulose sizing tools, such as the dimers of alkylbetaine and substituted succinic anhydrides, and not reactive with respect to the cellulose sizing means, for example a size based on rosin and resin-based.Dispersion of hydrophobic material, generally contain an aqueous phase and dispersed therein finely divided particles or droplets of a hydrophobic material. Dispersion is usually prepared by homogenization of hydrophobic water-insoluble material in the aqueous phase in the presence of a dispersant using high-effort shift and relatively high temperatures. Traditionally used dispersing agents include anionic, amphoteric and cationic polymers with high molecular weights, for example lignosulfanaty, starches, polyamine, polyamidoamine and polymers attach vinyl groups. The polymers can be used alone, together or in combination with other compounds to form a dispersant system. Depending on the total charge of the system components dispersant, prokletije show rather poor stability and high viscosity, even at relatively low solids contents, which obviously leads to difficulties when handling dispersions, for example during storage or during use. A further disadvantage is that the products must be supplied in the form of dispersions with a low concentration, which further increases the cost of transportation active hydrophobic material.Accordingly, the purpose of the present invention is to provide aqueous dispersions of hydrophobic material with improved properties stability and viscosity. Another purpose of this invention is to provide improved aqueous dispersions of sizing tools, especially sizing means reactive with respect to the cellulose. Further targets will be set forth below.Description of the invention
In accordance with the present invention it was found that improved properties stability and viscosity can be obtained from aqueous dispersions of hydrophobic material, in which the hydrophobic material is distributed in the aqueous phase using a dispersant comprising two oppositely charged compounds having relatively low molecular weight. More specifically, the present izaberete the dispersant, includes anionic compound having a molecular weight less than 50,000 and selected from organic compounds and silicon-containing compounds, and cationic organic compound having a molecular weight less than 50,000. The present invention thus relates to a water dispersion, its preparation and use, as hereinafter defined in the claims.The present invention makes it possible to provide a dispersion of hydrophobic material with improved storage stability, higher solids content and/or lower viscosity. In addition, when using dispersions in cases involving very high dilution of the dispersion with initially high concentration, it was found that the dispersed phase is more stable, i.e. the dispersion shows improved stability upon dilution. Examples of applications with extremely high dilution include conditions with wetting at the final stage in the manufacture of paper and storage or internal sizing, which include adding a dispersion of hydrophobic material to a water suspension containing cellulose fibers and optional filler. In this context, improved with the tion, whereby are formed lower levels of larger units with lower efficiency sizing, and less deposition of hydrophobic sizing means on the machine for the production of paper and less pollution wires, through which decreases the need for maintenance of machinery for paper production. Further benefits associated with this variance include improved stability in the presence of interfering substances, for example anionic impurities derived from impurities pulp and/or fibers that are returned for reprocessing, and less accumulation of hydrophobic material in the white water re-circulating in the paper production process. Accordingly, dispersion of the present invention are particularly useful in processes where extensive white water recycle and where the pulp suspension contains significant amounts of impurities. Moreover, the dispersions according to this invention also provide an opportunity to obtain an improved sizing compared to dispersions of normal size, with appropriate dosage size and to use a lower dosage of a size to achieve the appropriate level use the appropriate technical conditions, additionally reduces the risk of accumulation is not adsorbed hydrophobic sizing means in the white water, recirculating the process by which additionally decreases the risk aggregation and deposition of hydrophobic material on the machine for the production of paper. The present invention thus offers significant economic and technical advantages.The hydrophobic material is present in the dispersion, preferably essentially insoluble in water. Examples of suitable hydrophobic materials include compounds which are useful as sizing means in the manufacture of paper, which can be obtained from natural and synthetic sources, such as hydrophobic substances reactive with respect to the cellulose and hydrophobic substances which are not reactive with respect to the cellulose. In the preferred embodiment of the invention the hydrophobic material has a melting point below about 100oC and especially below about 75oC.In the preferred implementation of this invention, the hydrophobic material is a size that is reactive with respect to the cellulose that can Fit a size selected from the group consisting of hydrophobic ketene dimer, multimers of ketene, acid anhydrides, organic isocyanates, chlorides of carbamoyl and their mixtures, preferably of ketene dimer and anhydrides of acids, most preferably from ketene dimer. Suitable ketene dimers have the General formula (I) shown below, where1and R2represent a saturated or unsaturated hydrocarbon group, typically saturated hydrocarbons, hydrocarbon groups having from 8 to 36 carbon atoms are alkyl groups with straight or branched chain, having from 12 to 20 carbon atoms, such as, for example, hexadecyle or octadecylphenol groups. Suitable anhydrides of acids may be described by the General formula (II) shown below, where R3and R4may be identical or different and represent saturated or unsaturated hydrocarbon group, respectively, contain from 8 to 30 carbon atoms, or R3and R4together with-C-O-C-group may form a 5 to 6-membered ring, optionally being optionally substituted hydrocarbon groups containing up to 30 carbon atoms. Examples of anhydrides of acids that are used on an industrial scale, including < / BR>Suitable ketene dimers, acid anhydrides, organic isocyanates include compounds described in U.S. patent N 4522686, which is included in the description by reference. Examples of suitable chlorides of carbamoyl include compounds described in U.S. patent N 3887427, which is also included as a reference.In another preferred implementation of this invention, the hydrophobic material is a hydrophobic substance, is not reactive with respect to the cellulose, which may be selected from any known size, not reactive towards cellulose. Accordingly, sizing tool, and is not reactive with respect to the cellulose selected from the group consisting of hydrophobic substances on the basis of rosin, such as rosin, disproportionating rosin, gidrirovannoe rosin, polymerized rosin, rosin treated with formaldehyde, esterified rosin, fortified rosin, and mixtures of such treatments and thus treated of rosins, fatty acids and their derivatives, for example esters of fatty acids and amides, such bis-stearic amide, resin and its derivatives, such as hydrocarbon is synthetic waxes, naturally occurring waxes, etc.Dispersion of the present invention contain a dispersant or dispersant comprising at least one anionic compound and at least one cationic compound, and both compounds have a low molecular weight (hereinafter NIV). Connection NIV preferably connected to each other by the force of electrostatic attraction, forming koatservatnyh disperser. When used in combination NIV compounds are effective as a dispersant hydrophobic material, while anionic and cationic compounds are not required to be, and usually are not effective as a dispersant, when used alone. In a preferred implementation, at least one of the anionic and cationic compounds is a polyelectrolyte. The term "polyelectrolyte", as used here, refers to the compound having two or more charged (anionic/cationic) groups, and charged (anionic/cationic) compounds acting as a polyelectrolyte, for example by chemical non-ionic interaction or attraction.Anionic compound dispersant contains one or bleep and anionic compounds having two or more anionic groups, which are here designated as anionic polyelectrolytes. Anionic polyelectrolytes may contain one or more cationic group, provided that they have an overall negative charge. Examples of suitable anionic groups include sulfate groups, and carbonyl, sulfonic, phosphoric and phosphonic acid groups which may be present as free acid or water soluble salt is ammonium or alkali metal (usually sodium), such as carboxylates and sulfonates sodium. Anionic polyelectrolytes can have a degree of substitution varying within a wide range; the degree of anionic substitution (DSA) may be from 0.01 to 1.4, suitably from 0.1 to 1.2 and preferably from 0.2 to 1.0.Anionic compound dispersant may be derived from synthetic and natural sources, and preferably it is water-soluble or capable of forming a dispersion in water. In the preferred implementation of the anionic compound is an organic compound, i.e., containing carbon atoms. Suitable anionic compounds include anionic surfactants like alkyl, aryl and alkylarylsulfonate and fireslate, ulcerate and diallylmalonate, with alkyl groups having from 1 to 18 carbon atoms, aryl groups having from 6 to 12 carbon atoms and alcylaryl groups having from 7 to 30 carbon atoms. Examples of suitable anionic surfactants include sodium lauryl sulfate, laurylsulphate sodium and dodecylbenzenesulfonate sodium. Further examples of suitable anionic compounds include anionic polyelectrolytes, such as, for example, anionic organic NIV polymers, optional split, for example, compounds derived from processed phosphoric acid, from sulphonated and carboxylating polysaccharides such as starches, guar gums and cellulose, preferably from cellulose derivatives and especially carboxymethylamino cellulose, as well as the condensation products, for example anionic polyurethanes and condensed naphthalenesulfonates, and further polymers attach the vinyl groups formed from monomers with anionic groups, for example acrylic acid, methacrylic acid, maleic acid, basis of itaconic acid, crotonic acid, vinylsulfonic acid, from sulphonated styrene and phosphates hydroxyethylacrylate and methacrylates, optionally copolymerizable of such monomers, vinyl ethers and similar compounds. Anionic compound may be selected from the NIV inorganic compounds containing silicon atoms, such as, for example, silicates and various forms of condensed or polymerized silicic acid, for example oligomeric silicic acid, poly acids, polysilicates, polyaluminosilicate, microgels of polysilicates, microgels of polyaluminosilicate and material based on silicon, for example, in the form of a Sol of silicic acid, which is negatively charged hydroxyl group.Cationic compound dispersant contains one or more cationic groups of the same or of different types and include cationic compounds having at least one cationic group, and a cationic compound having two or more cationic groups, which here refers to the cationic polyelectrolytes. Cationic polyelectrolytes may contain one or more anionic group, provided that it has an overall positive charge. Examples of suitable cationic groups include groups of sulfone, postname group, salt accession acid to primary, secondary and tertiary amines or amino groups and Quaternary ammonium groups, n accession acids to amines/amino groups and Quaternary ammonium groups. Cationic polyelectrolytes can have a degree of substitution varying within a wide range; the degree of cationic substitution (DSC) may be from 0.01 to 1.0, suitably from 0.1 to 0.8 and preferably from 0.2 to 0.6.Cationic compound dispersant may be derived from synthetic and natural sources and is preferably water-soluble or capable of forming a dispersion in water. The cationic compound is preferably an organic compound. Examples of suitable cationic compounds include cationic surfactants, for example, compounds of the type R4N+X-where each group R is independently selected from (i) hydrogen; (ii) a hydrocarbon group, suitably an aliphatic, preferably alkyl groups having from 1 to about 30 carbon atoms, preferably from 1 to 22 carbon atoms; and (iii) a hydrocarbon group, suitably an aliphatic, preferably alkyl groups having up to about 30 carbon atoms, preferably from 4 to 22 carbon atoms, and which is broken by one or more heteroatom, for example oxygen or nitrogen, and/or groups containing a heteroatom, for example carbonyl or Allexinno groups is rat carbon atoms; suitably, 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, typically a halogen, like chlorine, or anionic group present in the anionic compound dispersant, for example where the surfactant is a protonated amine of the formula R3N, where R and N are as defined above. Examples of suitable surfactants include chloride dioktyldimethylammonium, didecyldimethylammonium chloride, chloride of dioctylamine, chloride of cocobenzyldimethylammoniumchloride, chloride Coco(fractionated)benzyldimethylammonium chloride of octadecyltrimethylammonium, chloride of dictatorially, chloride of directdelivery, chloride, di(hydrogenated tallow fat)dimethylammonio, chloride, di(hydrogenated tallow fat)benzylmethylamine, (chloride, hydrogenated tallow fat)benzyldimethylamine, chloride of mileydeminiley and chloride di(ethylenebisdithiocarbamate)dimethylammonio. Particularly preferred cationic poverhnosti with from 9 to 30 carbon atoms and especially Quaternary ammonium compounds. Further suitable cationic surfactants include Quaternary compounds di - and polyamine containing at least one hydrocarbon group, suitably an aliphatic, preferably alkyl with from 9 to 30 carbon atoms, preferably from 12 to 22 carbon atoms. Examples of suitable surfactants of this type include dichloride, N-octadecyl-N-dimethyl-N'-trimethyl-propylene-diammonium. Further examples of suitable surfactants include cationic polyelectrolytes, such as, for example, cationic organic NIV polymers, optional split, for example, derived from polysaccharides such as starches, guar gum, cationic products of condensation such as polyurethanes, polyamidoamine, for example, polyamideimides, polyamine, for example, copolymers dimethylamine-epichlorohydrin, copolymers of dimethylaminomethylene-epichlorohydrin, copolymers of ammonium ethylene dichloride, polymer with accession vinyl, formed from monomers with cationic groups, such as homopolymers and copolymers of chloride of diallyldimethylammonium, dialkylaminoalkyl, methacrylates and acrylamide (for example, dimethylaminoethylacrylate and m is I, optional copolymerizable with non-ionic monomers including acrylamide, alkylacrylate, styrene and Acrylonitrile, and derivatives of such monomers, vinyl esters and similar compounds.As anionic NIV connection and cationic NIV connection for use in the present invention have a molecular weight (hereinafter MV) less than 50000, suitably less than 30,000, and preferably less than 20,000. Additional benefits can be seen, where MV anionic compounds and/or cationic compounds dispersant is even lower, for example, less than 15000 and especially less than 10000. Typically, anionic and cationic compounds have MV above 200 and above are eligible to 500. Typically, anionic and cationic surfactants have MV lower than that of anionic and cationic polyelectrolytes; preferred surfactants have a MW of from 200 to 800. When one of the compounds of the dispersant is a surfactant, another connection dispersant should preferably be of the electrolyte, which may have MV same as defined above.Preferred dispersions according to the present invention contain a dispersant selected from the group consisting of dispersant has an overall anionic charge; dispersant (ii) comprising a cationic polyelectrolyte and anionic polyelectrolyte, where the dispersant has an overall negative charge; dispersant (iii) comprising anionic surfactant and a cationic polyelectrolyte, where the dispersant has an overall cationic charge, and dispersant (iv) comprising anionic polyelectrolyte and a cationic polyelectrolyte, where the dispersant has an overall cationic charge; and anionic and cationic polyelectrolytes and their molecular weights are as defined above.Anionic and cationic compounds of the dispersant may be present in the dispersion in amounts varying within wide limits and depend, inter alia from the molecular weight of these compounds, the degree of ionic substitution of these compounds, i.e., charge density, the desired full charge dispersion and used hydrophobic material. As the anionic compound and the cationic compound may be present in an amount up to 100% by weight, suitably from 0.1 to 20% by weight and preferably from 1 to 10% by weight, based on the weight of the hydrophobic material.It was found that the dispersion of the present invention can be prepared with you the kind of viscosity. This invention provides a dispersion of hydrophobic material with improved storage stability and/or high solids content. Particularly preferred dispersion in this regard include dispersion size, reactive with respect to the pulp, especially dispersion with dispersant with a full negative charge. Dispersion sizing means reactive with respect to the cellulose of the present invention, generally have a content of a size from about 0.1 to about 50% by weight, suitably above 20% by weight. A dispersion containing a sizing agent, representing a dimer of ketene, according to the present invention have a dimer content of ketene within the range from 5 to 50% by weight and preferably from about 10 to about 35% by weight. Dispersion, or emulsion containing a sizing agent, which represents an acid anhydride of the present invention have a content of acid anhydride within a range from 0.1 to about 30 weight% and typically from about 1 to about 20% by weight. The dispersion of a size that is not reactive with respect to cellulose, as a rule, can have the contents of the current invention can be produced by mixing the aqueous phase with the system dispersant and a hydrophobic material, preferably at a temperature at which the hydrophobic material is a liquid, and the mixture thus obtained mixture is eligible under pressure. The resulting aqueous emulsion, which contains droplets of hydrophobic substances usually have a size of from 0.1 to 3.5 microns in diameter, then cooled. In addition to the above components in a sizing dispersion can be also introduced other materials, such as, for example, additional dispersing agents and stabilizers, such as non-ionic dispersing agents, fillers such as urea and urea derivatives, and the dispersion stabilizers. It will be appreciated that the negative and positive charges of the compounds of the dispersant can be formed in situ, for example, by contacting the compounds with one another and/or by mixing the compounds with an aqueous phase and/or by lowering the pH of the aqueous phase. For example, the loss of hydrogen from the acid group will lead to the formation of a negative charge and primary amine or amino group may be cationic, by protonation or separation of hydrogen. Accordingly, it is possible to start with uncharged compounds in the preparation of the dispersion. For example, can be used organicheskoi R4N+X-formed in the method of preparation, where R, N and X are such as defined above.It was found that the components of these dispersions can be easily homogenized in the presence of the aqueous phase, in particular, using NIV connection dispersant in combination with a hydrophobic material having a melting point below about 100oC and especially below about 75oC. Typically requires less energy and lower the effort of mixing in this method compared to the methods of preparation of conventional dispersions and by which can be applied more simple equipment. Therefore, next, a method of producing dispersions includes (i) mixing a hydrophobic material with anionic and cationic compounds disperser to obtain an intermediate composition, and (ii) homogenization of intermediate composition in the presence of the aqueous phase, as described above. It is preferable that the components were homogeneous mixed in stage (i). The hydrophobic substance used in stage (i) may be solid, although preferably it is a liquid to facilitate homogeneous mixing. If desired, split timing shall be in substantially anhydrous intermediate composition, containing a dispersant and a hydrophobic material, which makes it possible to simplify the shipment attractive from an economic point of view. In the place where its going to use, or somewhere in another place intermediate hydrophobic composition can be homogenized in the presence of water, traditional or simplified method, optionally at elevated temperature to provide a liquid intermediate composition. This method is particularly attractive in the preparation of dispersions of ketene dimers and acid anhydrides, the latter of which is usually prepared in the mills for grinding paper in direct connection with their use as a size in the manufacture of paper. Stability when stored in a substantially anhydrous composition, therefore, offers significant economic and technical benefits. The present invention thus also relates to the composition substantially anhydrous concentrate comprising a hydrophobic material, anionic NIV a compound selected from carbon-containing compounds and silicon-containing compounds and cationic organic NIV connection, where anionic and Katie is gidrofobnogo material in the aqueous phase, its preparation and use, as hereinafter defined in the claims.Components that are present in the concentrate composition of the present invention, i.e., the hydrophobic material and the anionic and cationic compounds, preferably such as defined above. The composition is substantially anhydrous and present means that may be present a small amount of water; the water content may be from 0 to 10% by weight, suitably less than 5% by weight and preferably less than 2%. Most preferably, it contains no water. The composition preferably contains a hydrophobic material in vast quantity, by weight, i.e. at least 50% by weight, and suitably the composition has a content of hydrophobic substances within a range from 80 to 99.9% by weight and preferably from 90 up to 99.7% by weight. Anionic and cationic compounds may be present in the composition in amounts defined above, with regard to dispersion, where the percentages are based on hydrophobic material. Accordingly, as the anionic compound and the cationic compound may be present in the composition in amounts up to 100% by weight, suitably from 0.1 to 20% by weight and preferably from 1 to 10% by weight, based on the weight of hydrotest traditional way in the production of paper using any type of cellulose fibers and it can be used as a surface sizing, and for the internal sizing or sizing of raw materials. The term "paper" as used here, means that it includes not only paper, but also all types of products based on cellulose in the form of sheets and 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, based on the dry weight of the feedstock. Examples of mineral fillers traditional types include kaolin, porcelain clay, titanium dioxide, gypsum, talc and natural and synthetic calcium carbonates such as chalk, milled marble and precipitated calcium carbonate. The number of hydrophobic sizing tools added to the starting materials, may be from 0.01 to 5% by weight, suitably from 0.05 to 1% by weight, based on the dry weight of cellulose fibers and optional fillers, where the dosage mainly depends on the quality of pulp or paper, you want to glue, used size and level of desired sizing.In the preferred implementation of the dispersion used in the sizing of the source is by the number of lipophilic substances, such as raw materials, made from certain varieties perioodilisi or returned for recycling pulp mass, for example, where there is a large recirculation of white water. Particularly preferred dispersion in such applications include dispersion size, reactive with respect to the cellulose and dispersion with dispersant with an overall negative charge. Usually cationic demand is at least 50, suitably at least 100 and preferably at least 150 mkacf. per liter of the filtrate of the feedstock. Cationic demand can be measured in the traditional way, for example, by a detector of charged particles Mutec, using the filtrate of raw materials derived from raw, filtered through a 1.6 μm filter, and poly(chloride of diallyldimethylammonium) as the titrant. The amount of lipophilic extracts may be at least 10 ppm, typically at least 20 ppm, suitably at least 30 ppm and preferably at least 50 ppm, measured as ppm DHM by extraction using DHM (dichloromethane) in a known manner. Further, these dispersions are preferably used in the production of paper, where extensive proizvedeniy paper use from 0 to 30 tons of fresh water, usually less than 20, suitably less than 15, preferably less than 10 and especially less than 5 tons of fresh water per tonne of paper. Recirculation of white water in the process preferably takes place by mixing the white water with cellulose fibres, preferably in the form of raw materials or suspension, before or after adding a sizing dispersion, for example for the formation of the feedstock, which is necessary to dehydrate. Fresh water can be introduced into the process at any stage; for example, it can be mixed with cellulose fibres in order to obtain raw materials, and it can be mixed with the raw material containing cellulose fibers, in order to dilute it in order to obtain raw materials, which is necessary to dehydrate before or after mixing of the feedstock with the white water and before or after addition of the dispersion size.Chemicals are usually added to the feedstock in the manufacture of paper, such as restraint, dyes, water-resistant resin optical bishopshostel, etc. can of course be used in conjunction with these sizing dispersions. Size, not reactio what it means to the fiber pulp. Examples of aluminum compounds include alum, aluminates and connection of polyamine, such as chlorides and sulfates of polyalanine. Examples of suitable restraint substances include cationic polymers, anionic inorganic materials in combination with organic polymers, such as bentonite in combination with cationic polymers, sols on the basis of silicic acid in combination with cationic polymers or cationic and anionic polymers. Especially good sizing of the feedstock can be obtained with the use of the dispersions according to the present invention in combination with the restraint substances, including cationic polymers. Suitable cationic polymers include cationic starch, guar gum, polymers based on acrylate or acrylamide, polyethylenimine, dicyandiamide, polyamine, polyamidoamine and poly(chloride of diallyldimethylammonium), and combinations thereof. Cationic starch and cationic polymers based on acrylamide are preferably used individually or in combination with each other or with other materials. In the preferred implementation of the invention dispersion is used in combination with systems holding, vklyuchayuschimisya can be added to, between, after or simultaneously with the addition of the cationic polymer or polymers. It is also possible to pre-mix a sizing dispersion with restraint substance, such as a cationic polymer, such cationic starch or cationic polymer based on acrylamide, or an anionic material based on silicon dioxide, before the introduction of the thus obtained mixture in the feedstock. Accordingly, the dispersion can be prepared directly before inserting it in the source material by introducing into contact with a sizing dispersion containing the cationic compound, preferably a cationic surfactant, an anionic material based on silicon dioxide, for example, as defined above.The present invention is further illustrated by the following examples, which, however, do not have the intention to limit the invention. Parts and % are by weight and % by weight, respectively, if not otherwise specified.Example 1
The dispersion of the hydrophobic dimer of alkylation (AAA) according to the present invention was prepared by mixing chloride, di(hydrogenated tallow fat)dimethylammonio, which is a is melted at 70oC AAA, passing the mixture through a homogenizer in the presence of an aqueous solution of condensed naphthalenesulfonate sodium with an estimated MW of approximately 6000, sold under the trade name OrotanTMSN, Rohm & Haas Company, and then cooling the thus obtained dispersion. the pH of the Dispersion was set equal to about 5 by adding acid. The variance, denoted by variance N 1, had the contents AAA 30% and contained 6% anionic compounds and 4% cationic compounds, the content of both compounds based on the weight of the AAA. The dispersion contained particles reactive with respect to the cellulose hydrophobic compounds with an average particle size of about 1 μm, which were negatively charged, as shown negative Zeta potential, defined through a ZetaMaster S Version PCS.Example 2
The stability of the dispersion from example 1 was tested as follows: the dispersion was diluted with water to give a dispersion containing 40 ppm AAA. Some tests were added 10 ppm stearic acid, in order to assess the stability in the presence of lipophilic, anionic compounds impurities. The diluted dispersion was placed in a jar equipped with a device for measuring turbidity, loop, Serval in the loop, at the same time automatically recorded turbidity and subjected to dispersion cycle of heating and cooling within the prescribed period of 45 minutes. The temperature of the dispersion was raised from the 20oC-62oC and then again lowered to 20oC. the turbidity is affected by the particle size and the difference in the turbidity of the dispersion before and after the temperature cycle is a measure of the ability of distributed particles to resist growth through adhesion and, thus, a measure of the stability of the dispersion. The difference in turbidity (DT) is calculated as follows:
T = (end-turbidity/initial turbidity) 100.The higher the T, the better the stability.Two standard dispersion were also tested for comparison purposes. The benchmark. 1 is an anionic AAA dispersion containing a dispersant system consisting of lignosulfonate sodium and cationic starch with high molecular weight (IUDs), where anionic lignosulfonate ion is present in excess. Standard 2 represents a cationic AAA dispersion also containing sodium lignosulphonate and Navy cationic starch, but where the cationic starch is present in the ion abundance. Table 1 gives the results obtained.As p is bound dispersions, what, therefore, is the best indicator of stability in diluted condition.Example 3
The anhydrous composition concentrate according to the present invention was prepared by dry mixing 93 parts of granules AAA three parts of cationic surfactants and 4 parts of the anionic compound used in example 1. This dry mixture was added later to the hot water and the thus obtained aqueous mixture was heated to 80oC was pumped through the pump with a strong shift and then cooled to room temperature. The resulting anionic dispersion, variance N 2, had the contents of the AAA, equal to 20%, and the average particle size of about 1 μm.The effectiveness of the sizing appreciated cooking sheets of paper according to the standard method SCAN-C23X for laboratory scale and the use of raw materials for the production of paper containing 80% 60:40 bleached sulfate birch/pine and 20% of chalk, to which was added 0.3 g/l Na2SO410H2O. the initial Viscosity of the product was 0.5% and pH 8.0. Dispersions were used in conjunction with a commercial system retention and dewatering CompozilTMincluding cationic starch and anionic Sol kmal added in the amount of 12 kg/t, based on dry raw materials, and the Sol of silicic acid added in a quantity of 0.8 kg/ton, calculated as SiO2and based on dry raw materials.Values Cobb, measured according to the standard TAPPI T 441 OS-63 obtained in the tests are presented in table 2. Dosage AAA based on dry raw materials.Table 2 demonstrates the improvement in the sizing of paper, obtained by dispersion of the present invention.Example 4
Ease of production of the dispersions according to the present invention was evaluated by preparing anionic AKD dispersions with different content of AAA. The dispersions according to the invention were prepared by homogenizing a mixture of 0.8% by weight chlorided (hydrogenated tallow fat)dimethylammonio, and 1.6% by weight of condensed naphthalenesulfonate sodium, 77,6% by weight water and 20% by weight of the AAA within a specified time, using the mixer Ultra Turrax at 15,000 revolutions per minute, and then cooling the thus obtained dispersion within 2 hours. Similar dispersions were prepared in the same way with different content of AAA, to provide a dispersion with a content of AAA 10, 20, 30 and 40% by weight. For variances, indicated Izopet., should the content of AAA in the x same conditions by homogenizing a mixture of 1.0% by weight of cationic starch, of 0.25% by weight of sodium lignosulphonate, 89% by weight of water and 10% by weight of the AAA. Similar dispersions prepared with different contents of AAA in order to provide a standard dispersion with a content of AAA 10, 20, 30 and 40% by weight. For the variance, denoted by reference. 3, should the contents of the AAA in weight percent.The particle size and the viscosity was determined in a traditional way. Table 3 shows the results.Table 3 shows that the dispersion of the present invention is easier to manufacture, lower viscosity was obtained when the respective contents of the AAA and the smaller size of the particles obtained using the same amount of energy to install the free surface. Compared to the standard dispersion thus, the present invention requires less energy and lower shearing forces to produce a dispersion with equal particle size. In addition, the increase of the stirrer speed up to 25,000 rpm significantly reduced the particle size of the dispersions of the present invention, which is within the range of from 1 to 2 μm. 1. Aqueous dispersion containing a dispersant and dispergirovannoyj phase containing hydrophobic proclive than 50,000 and selected from carbon-containing compounds and silicon-containing compounds, and
b) a cationic organic compound having a molecular weight less than 50,000, where at least one of the anionic and cationic compounds is a polyelectrolyte.2. Dispersion under item 1, in which the anionic compound and the cationic compound have a molecular weight less than 20,000.3. Dispersion under item 1 or 2, in which the anionic compound is an organic substance.4. The variance in PP.1, 2 or 3, in which the dispersant is anionic and comprises a cationic surfactant and anionic polyelectrolyte.5. The variance in PP.1, 2 or 3, in which the dispersant is anionic and comprises a cationic polyelectrolyte and anionic polyelectrolyte.6. The variance in PP.1, 2 or 3, in which the dispersant is a cationic and includes an anionic surfactant and a cationic polyelectrolyte.7. The variance in PP.1, 2 or 3, in which the dispersant is a cationic and includes an anionic polyelectrolyte and a cationic polyelectrolyte.8. Dispersion according to any one of the preceding paragraphs, in which the content of the hydrophobic a size equal to at least 20% by weight.10. Dispersion according to any one of the preceding paragraphs, in which the sizing agent is a dimer of ketene or acid anhydride.11. Dispersion according to any one of paragraphs.1 to 8, in which the hydrophobic sizing the sizing tool is a tool, not reactive towards cellulose.12. Dispersion according to any one of the preceding paragraphs, in which the hydrophobic sizing tool has a melting temperature below the 75oC.13. A method of obtaining a water dispersion through homogenization hydrophobic sizing means in the presence of the aqueous phase and dispersant comprising anionic compound having a molecular weight below 50,000 and selected from carbon-containing compounds and silicon-containing compounds, and cationic organic compound having a molecular weight below 50000, where at least one of the anionic and cationic compounds is a polyelectrolyte.14. The method according to p. 13, in which the anionic compound and the cationic compound have a molecular weight less than 20,000.15. The method according to p. 13 or 14, in which the anionic organic compound is an organic substance.16. On sunie, having a molecular weight less than 50,000 and selected from carbon-containing compounds and silicon-containing compounds, and cationic organic compound having a molecular weight less than 50,000, where at least one of the anionic and cationic compounds is a polyelectrolyte.17. The composition according to p. 16, in which the anionic compound is an organic substance.18. The composition according to p. 16 or 17, in which the hydrophobic sizing tool is a dimer of ketene or acid anhydride.
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.
21 cl, 3 tbl
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
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
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: textiles, paper.
SUBSTANCE: mass contains hardwood and softwood pulp, microfibrillated cellulose fibers, alkyl ketene dimer, sodium carboxymethyl cellulose. The ratio of the components, wt %: hardwood pulp 75.0-99.18, softwood pulp 0.00-19.40, microfibrillated cellulose fibers 0.50-10.00, alkyl ketene dimer 0.02-0.12, sodium carboxymethyl cellulose 0.30 -1.20.
EFFECT: invention enables to improve the strength of paper.
SUBSTANCE: invention relates to a stable glue composition for paper, a method of producing said composition and a method of gluing paper. The glue composition includes a starch-stabilised ketene dimer dispersion and a transparent homogeneous polymer solution. The transparent polymer solution contains a vinyl amine with acid-controlled pH lower than 3.0. The pH of the transparent solution is controlled. The solution is then mixed with the ketene dimer dispersion. The mixture is held for at least one hour. The obtained mixture is used as an additive to a cellulose suspension or in gluing press.
EFFECT: invention enables to obtain a stable glue composition which provides high gluing efficiency of the gluing composition for paper.
15 cl, 6 tbl, 6 ex