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.

 

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