Method of preparation of paper pulp
(57) Abstract:Usage: the invention relates to the production of paper and paperboard, mainly of unbleached sulfate pulp, with biopersistence and intended for General use. The essence izobreteniya method comprises introducing a slurry of fibrous semi-finished product on the basis of unbleached sulphate pulp of polydimethyldiallylammonium, pretreated with acidic agent, preferably, aluminum sulfate, or sulfuric acid, or hydrochloric acid, until the pH value of the mixture in the range 0-4. The invention allows to achieve a stable Hobbies antimicrobial activity, to increase the destructive force in the transverse direction and to reduce the absorbency of paper and cardboard. 1 C.p. f-crystals, 1 table. The present invention relates to the production of paper and paperboard, mainly of unbleached sulfate pulp, with biopersistence and intended for General use.Known method of preparing paper pulp for making paper-sanitary and domestic purposes.To make this paper bactericidal properties in paper MASSY absolutely dry fiber. It achieves an acceptable level of bakteriostatichnosti of paper.However, when the transition to the paper pulp on the basis of unbleached sulphate pulp bacteriostatic properties of paper and paperboard, received a considered way, inadequate.In addition, this method leads to decrease in mechanical strength and increase the porosity of the resulting paper and cardboard. This, in turn, affects the suitability of paper and cardboard on the basis of unbleached sulphate pulp container for packaging and technical products.There is also known a method of manufacturing a biostable fibrous material. To increase the biostability of fibrous material in the pulp impose dissolved in sulfuric acid of arsenic-bearing wastes honey - and cameltoecollege production and precipitated highly toxic arsenate on the fibers aluminium sulphate. The level of biocides products is regulated by the number of arsenic compounds.The considered method is not suitable for production of wide use because of the high toxicity of arsenic compounds, precluding the use of such paper for packaging and ogranichivayushchei environment.The closest analogue of the present invention is a method for preparing paper pulp, comprising introducing a suspension of fibrous paupertate on the basis of unbleached sulphate pulp of polydimethyldiallylammonium [R. Nicke. Produktionssteigerung durch Flockungsmittel. - Zellstoff und Papier; N 1, 1982, s. 19-23]. Polydimethyldiallylammonium injected into the fibrous mass with getting ready paper pulp, the pH of which is equal to 6.8. The paper obtained in this way has the best physical and mechanical properties compared to paper without polydimethyldiallylammonium at the expense of smaller floc mass. However, the paper obtained in this way does not have sufficient antimicrobial activity.The present invention is the preparation of paper pulp, giving izgotovliaemye from her paper and cardboard, high biostability and mechanical properties with specific technical result is an increase in antimicrobial activity, increasing the destructive forces in the transverse direction and decrease absorption.This task is solved in that in the method of preparation of paper pulp, comprising introducing a suspension of fibrous polyfabric the introduction to the suspension polydimethyldiallylammonium pretreated with acidic agent until the pH of the resulting mixture in the range 0-4.As the acidic agent is preferable to use aluminum sulfate, or sulfuric acid, or hydrochloric acid.Mixing polydimethyldiallylammonium with an acid agent to achieve a pH of the mixture within 0-4 before introducing it into the suspension of fibrous semi-finished product fundamentally changes compared with the specified the closest analogue to the process of making paper pulp.In the acidic environment significantly increases the degree of dissociation of the Quaternary ammonium groups polydimethyldiallylammonium. The increase in the degree of dissociation increases the effect of polyelectrolyte allowed one Quaternary ammonium group and contributes to a more uniform distribution of molecules polydimethyldiallylammonium on the cellulose fibers. In addition, alkaline weight unbleached pulp suppresses biocidal action of polydimethyldiallylammonium, and the acidic environment created in the proposed method compensates for this negative impact.As the acidic agent can be used any sufficiently strong acid or acidic salt of such acid and weak base, allowing you to reach in a mixture with polydimethylaminoethyl lift aluminum, sulfuric or hydrochloric acid, because of their expense and the cost is minimal, and the remaining subgrid water sulphates and chlorides practically harmless and do not require special treatment of wastewater. Use as an acidic agent aluminum sulfate provides an additional increase in flocculation of action due to the synergistic interaction of multiply charged ions of aluminum compounds with the polymer electrolyte.Thus, the found set of techniques can significantly improve the antimicrobial properties of paper simultaneously with the reduction of pollution of wastewater in comparison with the known technical solutions, including the prototype, for the reason that polydimethyldiallylammonium, pre-mixed with an acid agent, the better performs the function of flocculant, it is better distributed and retained on the fibers.Preparation of a mixture according to the present invention is carried out by mixing the solution of polydimethyldiallylammonium with acidic agent at a ratio of 3:1 and 1:100. A stronger dilution of the solution polydimethyldiallylammonium may significantly reduce the pH of the finished paper and consequently, its about what.The concentration of the solution of polydimethyldiallylammonium should not exceed 45 wt.% to maintain its fluidity. For acidic agent concentration is determined only by the desired pH level and security of work (the concentration of a strong mineral acids should not exceed 5%). Brand polydimethyldiallylammonium domestic production: VPK-402.Collected in this way the mixture is fed into the suspension of fibrous semi-finished product in an amount of 0.1-3% of the dry matter of polydimethyldiallylammonium by weight of the absolutely dry fiber. Preferred order dosage of this mixture into a slurry of fibrous semi-finished product for 3-15 minutes before its ebb after the introduction (if necessary) sizing materials, their coagulants such as aluminum sulfate, potassium or alimohammadian alum, and/or fillers.Suspension of fibrous semi-finished product may include wood pulp and/or bleached or unbleached pulp as sulfite and sulfate softwood and/or hardwood. It can be filled with known fillers with the effect of better retention and problematise both in acid and neutral medium sootoday materials is reduced while maintaining the same values of the absorption or the degree of sizing. It is permissible to use any noun, cationic, disperse, basic and direct dyes while also increasing their retention. Because the mixture obtained by the proposed method is compatible with the known coagulants and itself has properties coagulant, it allows to reduce the costs of coagulants and flocculants.Better retention of suspended solids in the paper pulp reduces BOD circulating water production flow and antimicrobial activity of polydimethyldiallylammonium reduce penoobraznaya due to mucus.The invention is illustrated by the following examples of its implementation. To ensure comparability of the results of all the examples belong to the same grinding and composition of the mass of fibrous materials prepared with the same consumption of all auxiliary substances and intended for the production of sack paper weight 78 g/m2.P R I m e R 1 (present invention). Method of preparation of paper pulp is carried out as follows.Use aqueous suspension of fibrous semi-finished product is 100% unbleached coniferous sulphate pulp, Noi rosin and to precipitate the rosin glue on the cellulose fibers of 1.2% of aluminum sulfate on the mass of absolutely dry fiber.200 l of a 5% solution of sulfuric acid poured with stirring 75 l of a solution VPK-402 product concentration polydimethyldiallylammonium 25 wt.%. The pH value of the mixture is equal to 0. Thus prepared mixture is metered before the pressure box machine for 10 minutes before low tide paper pulp at the rate of 0.2% of the dry polydimethyldiallylammonium per 1 ton of paper.The obtained pulp used to make paper sack weighing 78 g/m2, anti-microbial and physico-mechanical properties of which are given in the table.P R I m m e R 2 (present invention). Method of preparation of paper pulp is carried out analogously to example 1, with the differences that take 100 l of 3% aqueous solution of hydrochloric acid, add with stirring 100 l of a 25% aqueous solution VPK-402 and receive the mixture, the pH of which is equal to 2.7. Thus prepared mixture is metered before the pressure box machine for 3 minutes before low tide, paper pulp, the composition and the preparation is identical to that described in example 1, at the rate of 0.7% of dry polydimethyldiallylammonium per 1 ton of paper.The obtained pulp used to make paper sack weighing 78 g/m2, antimicrobial and physicist. the manual preparation of paper pulp is carried out analogously to example 1, with the differences that take 100 l of a 6% aqueous solution of aluminum sulfate, is added under stirring to 100 l of a 25% aqueous solution VPK-402 and receive the mixture, the pH of which is equal to 4. Thus prepared mixture is metered before the pressure box machine for 5 minutes before low tide, paper pulp, the composition and the preparation is identical to that described in example 1 at the rate of 1.5% of the dry polydimethyldiallylammonium per 1 ton of paper.The obtained pulp used to make paper sack weighing 78 g/m2, anti-microbial and physico-mechanical properties of which are given in the table.P R I m e R 4 (control). Method of preparation of paper pulp is carried out analogously to example 1, with the differences that take 100 l of a 0.3% aqueous solution of aluminum sulfate, is added under stirring to 100 l of a 25% aqueous solution VPK-402 and receive the mixture, the pH of which is equal to 5. Thus prepared mixture is metered before the pressure box machine for 5 minutes before low tide, paper pulp, the composition and the preparation is identical to that described in example 1 at the rate of 1.5% of the dry polydimethyldiallylammonium per 1 ton of paper.The obtained pulp ISPR which is shown in the table.P R I m e R 5 (prototype). Method of preparation of paper pulp is carried out analogously to example 1 with the difference that takes 100 litres of water, add with stirring 100 l of a 25% aqueous solution VPK-402 and receive the mixture, the pH of which is equal to 6.9. Thus prepared mixture is metered before the pressure box machine for 5 minutes before low tide, paper pulp, the composition and the preparation is identical to that described in example 1, the pH value of which is 6.8 at the rate of 1.5% of the dry polydimethyldiallylammonium per 1 ton of paper.The obtained pulp used to make paper sack weighing 78 g/m2, anti-microbial and physico-mechanical properties of which are given in the table.Area stunted growth is a quantitative measure of antimicrobial activity of paper and is determined by the method of disks on a Golden staph (Staphylococcus aureus), as the distance from the sample to the border of the growth of microorganisms.As can be seen from the table, the proposed method in comparison with the method of the prototype allows the paper sack to increase the average breaking force in the transverse direction by 6.0% and its absorption decrease of 15.5%. This antimicrobial activity have only samples, the boom is SI, includes introduction to the suspension of fibrous semi-finished product on the basis of unbleached sulphate pulp of polydimethyldiallylammonium, characterized in that before the introduction of the suspension polydimethyldiallylammonium pretreated with acidic agent until the pH of the resulting mixture in the range of 0 to 4.2. The method according to p. 1, characterized in that as the acidic agent used aluminum sulfate, or sulfuric acid, or hydrochloric acid.
FIELD: bleached mechanical pulp based on fibrillated cellulose fibers, hemicelluloses and lignin, paper made from said pulp, and method for producing said pulp using crystallized calcium carbonate in pulp-and-paper industry.
SUBSTANCE: method involves crystallizing calcium carbonate in said pulps and at least partly covering fibrillated cellulose fibers, hemicelluloses and lignin, with which calcium carbonate is strongly bound by mechanical binding. Method involves forming homogeneous water suspension by mixing lime and leached mechanical pulp based on fibrillated cellulose fibers, hemicelluloses and lignin; adding carbon dioxide into resulting suspension while mixing and keeping its temperature within the range of 10-50 C until lime is converted into calcium carbonate.
EFFECT: simplified method and improved quality of bleached mechanical pulp.
12 cl, 21 dwg, 5 tbl
FIELD: paper and pulp manufacturing.
SUBSTANCE: the present innovation deals with manufacturing paper being resistant to contamination and applied for manufacturing bills of exchange, shares, banknotes, savings certificates and others. Out of plant fibers one should form paper fabric to impregnate it with the composition that contains polyvinyl alcohol at weight concentration being under 8%, ammonium salt of titanium chelate and lactic acid. Paper fabric treated in gluing press or impregnation bath should be dried at 100°C, not less, passed through machine calender for providing the desired smoothness for further winding by rolling. The innovation increases paper resistance to contamination at keeping its high physico-mechanical properties.
EFFECT: higher efficiency of manufacturing.
6 ex, 1 tbl
FIELD: chemistry; textiles; paper.
SUBSTANCE: preparation method of polysilicate containing aqueous composition representing homogeneous liquid at 25°C, includes stages as follows: I) preparation of aqueous liquid containing silicate, II) reducing pH of the liquid to 2-10.5, III) ensured polymerisation time to actual completion resulted in making product containing gelled substance, IV) processing gelled substance with sufficient shearing to produce homogeneous liquid. Aqueous composition is prepared by the presented method. Aqueous composition contains polysilicate. This composition represents homogeneous liquid at 25°C. The composition develops viscosity at least 200 mPa·s when evaluated at concentration 2 wt % and at 25°C with using Brookfield viscosimeter at 20 rpm with shaft №2, with polysilicate of specific surface area not exceeding 2000 m2/g and S-value below 5%. Paper or carton making process includes preparation of cellulose suspension, with aqueous composition added, water drainage from suspension thus shaping wet paper web thereafter dried. Paper or carton making process includes preparation of cellulose suspension, added with mineral filler and exposed to drainage and containment system procedure, followed with water drainage from suspension thus shaping wet paper web thereafter dried. Mineral filler is aqueous composition. Before drainage and containment system is enabled, the suspension is exposed to at least, one shearing. This system implies adding aqueous composition to cellulose suspension, while shearing stage is specified from stirring, clarification and pumping.
EFFECT: improved quality of paper and carton.
46 cl, 16 tbl, 6 ex, 2 dwg
SUBSTANCE: invention relates to a compound of formula (1) where R1 denotes hydrogen or
EFFECT: compound is a more efficient paper bleaching agent.
8 cl, 4 tbl, 10 ex
SUBSTANCE: invention includes (a) at least one optical bleaching agent of formula (1) , wherein R1 denotes hydrogen or SO3M, R2 denotes hydrogen or SO3M, R3 denotes hydrogen or CH2CO2M, R4 denotes CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M, where M denotes hydrogen, a cation of an alkali metal, ammonia, mono-methyl-di-C2-C3-hydroxyalkylammonium, dimethyl-mono-C2-C3- hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C2-C3 hydroxyalkyl radical, or a mixture of said compounds, (b) a magnesium salt or (c) binder, which is selected from a group consisting of natural starch, enzyme-modified starch, and chemically modified starch, wherein there are 0.1-15 parts of component (b) for one part of component (a). The invention also relates to a method of bleaching paper using said composition.
EFFECT: composition is a more efficient means of achieving high paper whiteness.
9 cl, 4 ex, 3 tbl
SUBSTANCE: invention relates to recording sheets used in printing processes. The recording sheet comprises a substrate of the web of cellulosic fibres and the sizing composition. The sizing composition comprises a binder and a divalent metal salt. The said salt in a concentration of at least 51% of the total concentration and not less than 2500 parts per million is located at a distance within 25% of the total substrate thickness from at least one surface of the said substrate. At that the recording sheet has Qtotal as a measure of the amount of the sizing agent in the transition from the outer edges towards the middle of the sheet in cross-section of less than 0.5. Also a method of production of the recording sheet is described.
EFFECT: said substrate and the sizing agent interact with formation of the I-shaped structure of the recording sheet which provides an optical density of black printing of at least 1,15.
20 cl, 15 dwg, 2 tbl, 10 ex
FIELD: transportation, package.
SUBSTANCE: invention can be used for producing packages for storing liquid food products and other products containing liquid. The packaging of the autoclavable product is made of packaging cardboard. Mentioned cardboard comprises a fibrous substrate and one or more layers of polymeric coating, which is applied to one or both sides of the fiber base. The fibrous base comprises a combination of alkilketendimer (AKD) glue, stearic anhydride (SA), and glue, which enhances the strength in wet state, and aluminum compounds. The packaging is autoclaved at a temperature of at least 130°C.
EFFECT: invention allows to give the cardboard packaging the resistance to aggressive liquids, resistance to heat treatment, high resistance to liquid penetration through the raw edge under these influences.
13 cl, 8 ex
FIELD: fibrous materials.
SUBSTANCE: invention relates to method for production of fibrous semi-finished product with antibacterial properties, containing no heavy metals and useful in production of sanitary, domestic and hygienic paper as well as domestic articles (spoons, fogs, plates cups, etc.). Waste paper mass or mixture thereof with craft hardwood or coniferous cellulose is treated with potassium permanganate in amount of 0.1-0.5 % based on mass of dry cellulose in acidic medium using sulfur acid in amount of 3.1-18.6 % at 20-40°C until total reagent is absorbed.
EFFECT: semi-finished product of improved quality due to increased hygienic properties.
2 tbl, 25 ex
SUBSTANCE: invention proposes use of strobilurines as fungicidal agents designed to be applied in the form of dispersions in industrial process water and in the form of pulp both used in paper industry. Application areas include preservation of wet sheet, protection against mildew, in particular protection of paper products, or other areas wherein fungicidal or mildew-controlling agents are required. Water systems, which can be treated with strobilurines include papermaking machine systems, fibrous intermediate and paper systems, cooling towers, and heat-exchangers.
EFFECT: increased availability, reduced toxicity, and avoided involvement of volatile and inflammable organic solvents.
38 cl, 2 tbl, 4 ex
FIELD: paper and pulp manufacturing.
SUBSTANCE: the present innovation deals with manufacturing paper being of high antimicrobial and fungicidal activity and could be applied for manufacturing paper being resistant to contamination, of high physico-mechanical properties and applied for manufacturing banknotes, bonds, shares and others. The suggested composition includes a filamentous constituent, a filler, a gluing constituent, a biocidal additive as synergistic mixture of polyhexamethylene guanidine and sodium salt of benzoic acid at the ratio being (10-1):(1-10), correspondingly, a moisture-resistant additive, a binding agent and water. Moisture-resistant additive is being epichlorohydrin or urea-formaldehyde resin. Binding agent is being formalin or ammonium salt of titanium chelate and lactic acid. Gluing constituent additionally contains polyvinyl alcohol or sodium salt of carboxymethyl cellulose. The innovation enables to increase antimicrobial and fungicidal activity of the composition mentioned, simplify its application and, also, increases physico-mechanical properties, abrasion resistance and resistance to contamination of the obtained paper.
EFFECT: higher efficiency of manufacturing.
3 cl, 5 ex, 4 tbl
FIELD: textile fabrics, paper.
SUBSTANCE: invention relates to production process of pulp-bearing materials, particularly, paper, allowing biocide properties and provided for general-purpose, including, printing paper, capital issues and paper of sanitary and hygienic purpose. It is implemented preparation of paper stock. Before outflow of paper blade into paper stock it is implemented biocide. In the capacity of biocide it is used isolated during 4-24 hours hydrosol, consisting 4.0-10.0 wt % pro-modified by ions of Ag+ or/and Cu2+ of bentonitic powder, where silver and/or copper portion is 2.0-8.0 wt %. Per air-dry fiber of paper pulp it is used 0.2-1.8 wt % of defined bentonitic powder.
EFFECT: expansion of range and effectiveness of durable action of antibacterial and antimycotic properties of received paper at low cost-based part of biocide, applied in process of paper manufacturing.
4 cl, 5 ex
SUBSTANCE: invention refers to paper hygienic product such as a napkin, a hygienic pad, toilet paper, lavatory bowl packing, etc. Hygienic product consists of at least one protective paper layer with biocidal properties. Paper is obtained by introducing antimicrobial agent - biocide into paper mass before paper web is made. As biocide, there used is hydrosol exposed during 4-24 hours and containing 4.0-10.0 wt % of bentonitic powder modified with Ag+ or/and CU2 + ions and their content in the powder is 2.0-8.0 wt %. For dry paper web fibre there used is not more than 2.0 wt % of the modified powder. The product can be adsorbing and can contain water-resistant layer and surface layer made from nonwoven fabric or plastic film, or their combinations. Particle size of the modified bentonitic powder is not more than 150 nm. There can be used a mixture of bentonitic powders at their mixture ratio of 1-(0.3-0.5) accordingly. Deionised water is used for obtaining hydrosol.
EFFECT: there is provided achievement of the effect consisting in enlargement of range of biocidal properties of hygienic products, enhancement of efficiency of the prolonged action of antibacterial and antimycotic properties of the biocide with traditional process additions and fillers of the manufacturing process of such products.
8 cl, 1 ex
FIELD: textile, paper.
SUBSTANCE: method represents reduction of transition metals content in a milled mass to a level unfavorable for sporulation. Preferably, bacterial cells present in the milling system of cardboard or paper machine in fact are not destroyed in the process of technological operations used to reduce the content of transition metals. The method also refers to obtaining packing board or packing paper characterised with a low content of bacterial spores, when to obtain packing board or packing paper a milled mass is used in which the content of transition metals is reduced to a level unfavorable for sporulation.
EFFECT: reduction of bacterial spores in the milling system of a cardboard machine.
20 cl, 9 dwg, 7 ex
SUBSTANCE: wallpapers have a base and a face and a reverse sides. A coating that contains an antibacterial agent is applied onto the face side of the base. The coating antibacterial agent is represented by silver nanoparticles. The coating is produced by mixing of a varnish and a carbon porous carrier with silver nanoparticles in specified amount. Silver nanoparticles size is 2-50 nm. The carbon porous carrier has specific density of 0.03-0.1 g/cm3, specific surface of 50-200 m2/g and pore size of 5-50 nm. The varnish is a water-based acrylic varnish or an alkyd varnish. The wallpaper base is made of paper or cloth. The face surface of wallpapers is made of paper, cloth, fabric fibres or polyvinyl chloride. The carbon porous carrier with silver nanoparticles is in powder form. Glue is applied onto the reserves side of wallpapers.
EFFECT: higher quality of wallpapers and simplified technology of their manufacturing.
FIELD: textiles, paper.
SUBSTANCE: method includes production of a bactericide dispersion consisting of fibrillated cellulose fibers with immobilised on them chemical precipitation of nanoparticles of hardly soluble compounds of bactericidal metals, mixing it with dispersion of paper-forming fibers to produce paper pulp, paper formation.
EFFECT: simplifying the process of preparation of bactericide, provision of possibility to make the preparation and a paper containing it, respectively, with a different amount of bactericidal components in them, expansion of products and scope of application of the paper.
5 cl, 1 tbl
SUBSTANCE: invention relates to biocidal composition, applied for paper impregnation. Composition contains propylene glycol, starch and colloidal silver with particle size 1-13 nm in concentration in colloid solution 20-100 ppm with the following component ratio, wt %: propylene glycol - 2-4; starch - 2-4; colloidal silver - 2-3; water - the remaining part.
EFFECT: invention makes it possible to prepare ecologically harmless composition in a simple way.
2 dwg, 3 tbl, 2 ex
SUBSTANCE: claimed invention relates to disinfecting wipe, which contains material of fibrous cloth, which is hydrophobic in general and contains synthetic polymer capable of extrusion in melt, where material of fibrous cloth in general does not contain cellulose fibres; and bactericidal solution, present in amount from 150 wt % to 1000 wt % relative to dry weight of fibrous cloth material, where bactericidal solution contains from 0.01 wt % to 2 wt % of at least one peracid, from 0.5 wt % to 15 wt % of at least one peroxide, from 0.001 wt % to 2 wt % of at least one surface-active substance, where at least one surface-active substance includes non-ionic surface-active substance, including alcoxylate of fatty alcohol, and anionic surface-active substance, which includes sulphosuccinate. Claimed invention also relates to method of solid surface disinfection.
EFFECT: obtaining disinfecting wipe, which contains bactericidal solution and demonstrates highly efficient germicidal properties, and bacterial solution which remains stable.
24 cl, 8 ex, 1 dwg