A method of manufacturing paper pulp

 

(57) Abstract:

The method relates to the pulp and paper industry, namely the production of paper pulp in the production of printing and book and magazine paper. Prepare a water-fibrous dispersion of cellulose fibers. Its fill, glue and precipitated coagulant and flocculant. As coagulant use aluminum sulfate. As flocculant use polysulfonamide MM 2500 - 3000 or a copolymer methacrylamide with the ammonium salt of methacrylic acid MM 10000 to 100000, or a copolymer of piperylene with Acrylonitrile 10000 MM, or a copolymer of piperylene methacrylic acid 10000 MM. The technical result consists in increasing the efficiency of paper production, increase the degree of retention of pulp and Colina, reduction in the consumption of flocculants, the improvement of physical and mechanical properties of paper and reduction of wood consumption per unit of production. 1 C.p. f-crystals, 1 table.

The invention relates to a method for producing paper pulp in the production of printing and book and magazine paper in pulp and paper production.

From a large number of organic polymers, synthesized as in Russia, and RUB the e flocculants limited number of them. The results of the use of cationic and anionic polyelectrolytes brands "Perkol", "Zetag", "Magna", etc. to streamline the process, improve the quality of the paper is given in the publications. Monomeric structure and functional composition is not published.

Currently, PPI is widely used polymer imported - polyacrylamide. Closest to the claimed invention is a method of manufacturing paper pulp, selected as a prototype and includes the preparation of an aqueous fiber dispersion, filling, sizing and sedimentation with coagulant and flocculant, coagulant used aluminum sulfate, and the flocculant is polyacrylamide (Ivanov, S. N. Technology paper. From "Forest industry", M, 1970 C. 140, 141, 189, 192, 195, 233-235, 238, 239-242).

The disadvantages of this method are insufficient retention of the fibrous mass and kaolin, low quality paper, resulting fine fibers and particles of kaolin go into the waste water.

The surface energy of the dispersed phase aqueous suspensions of fibrous wood material and filler has the greatest influence on the strength of coupling between the individual fibers and filler particles and sootvetstvuyuschie polymers and copolymers as a result of their adsorption on the surface of the fibers and filler particles can not only change the magnitude of the surface charge, but to compensate for it (the point of zero charge), as well as cause a reload.

The present invention is to develop a method of manufacturing paper pulp using synthetic water-soluble polymers and copolymers as a flocculant in the production of printing and book and magazine paper in the pulp and paper industry, which would increase the degree of retention of paper pulp on a grid table BMD significantly increase the degree of retention of kaolin, to improve the properties of paper, to reduce the cost of flocculant, and, ultimately, to reduce wood consumption per unit of production in accordance with economic and environmental requirements.

This is technically the result of being in a causal connection with the essential features.

The essential feature of the invention is the preparation of an aqueous fibrous suspension, filling, sizing and sedimentation with coagulant and flocculant, is used as a coagulant aluminum sulfate, and the flocculant used is a water-soluble synthetic organic polymers and copolymers containing amide, or carboxyl, or sulfonic or nitrile groups, the better the magnitude and sign of the surface charge of the dispersed phase, to change the structure of the dispersion of paper pulp, to enhance flocculation by increasing the electrostatic component of the interaction forces, thus increasing the degree of retention of pulp and filler on a grid-style PM. This improves the physico-mechanical properties of paper, reduced flocculant consumption.

As the polymer containing a sulfonic group, use polysulfonamide MM2500-3000 (KK-10) structural formula

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as a copolymer containing amide group, use methacrylamide with the ammonium salt of methacrylic acid MM 10000-100000 (KK-2), structural formula

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as the polymer containing nitrile group, uses a copolymer of piperylene with Acrylonitrile MM-10000 (KK-3) structural formula

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as the polymer containing a carbonyl group, uses a copolymer of piperylene methacrylic acid 10000 MM (KK-4), the structural formula

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where m, n is the number of monomers in a macromolecule polymer.

Castings were prepared listonline apparatus LA-2 (Central laboratory of JSC "Syktyvkar LPK"). Determination of physico-mechanical properties were carried out according to GOST 13525.1-79, biometrische titration.

Example 1: Prepare the fiber as raw materials use 30% softwood pulp, 50% hardwood pulp, 20% thermomechanical pulp. To the fibrous mass add filler is kaolin at a flow rate of 140 kg/T, a sizing substance at the rate of 21 kg/T, as the precipitating use polyacrylamide at a flow rate of 0.44 kg/T and aluminum sulfate at a flow rate of 45 kg/T add cationically starch adhesive at the rate of 5.5 kg/T, pH mass 4,65, the surface charge is zero (the point of zero charge). Of the cooked pulp was prepared casting. Results: the retention weight - 64%, retention of kaolin, %/ash paper, % - 57,3/7,3, the resistance of the surface to picking - 1,33, the degree of dust - 0,35%, the rate of dehydration and 0.28 l/min

Example 2: Preparing a pulp of example 1, but as a flocculant used polysulfonamide chloride at a flow rate of 0.32 kg/T, pH, mass of 4.75, surface charge dispersion is negative. Results: the retention weight - 94,7%, retention of kaolin %/ ash paper% of 73.7/10.1, speed dehydration - 0,19 l/min, the resistance of the surface to picking - 1,32, the degree of piomote to 0.44%.

Example 3: Preparing a pulp of example 1, but as a flocculant results: the retention weight - 90,3%, retention of kaolin %/ ash paper% to 74.5/10,2, the rate of dehydration - 0,21 l/min, the resistance of the surface to picking - 1,33, the degree of piomote - 0,34%.

Example 4: Preparing a pulp of example 1, but as the flocculant used is a copolymer of piperylene with Acrylonitrile at a flow rate of 0.35 kg/T, pH mass - 4,65, the surface charge is positive. Results: the retention weight - for 87.9%, retention of kaolin %/ ash paper,% - 75,2/10,3, the rate of dehydration - 0.17 l/min, the resistance of the surface to the plucking is 1.34, the degree of piomote - 0,34%.

Example 5: Preparing a pulp of example 1, but as the flocculant used is a copolymer of piperylene with methacrylic acid at a flow rate of 0.31 kg/T, pH mass - 4,65, the surface charge is positive. Results: the retention weight - 86,3%, retention of kaolin %/ ash paper,% - 78,1/10,7, the rate of dehydration - 0,18 l/min, the resistance of the surface to picking - 1,26, the degree of piomote is 0.33%.

As follows from the presented data (see table), the use of domestic water-soluble synthetic polymers and copolymers: polysulfonamide 2500-3000 MM, methacrylamide with the ammonium salt of methacrylic acid MM 10000-100000, and copolymers p is per mass in the manufacture of paper allows for the strengthening of the forces of interaction between the components of paper pulp to increase retention mass 35-48%, on 20-36% increase retention of kaolin and improve the properties of paper. Thereby substantially reduced wood consumption per unit of production.

1. A method of manufacturing paper pulp, comprising the preparation of an aqueous fiber dispersion, filling, sizing and sedimentation with coagulant and flocculant, coagulant use aluminum sulfate, characterized in that as a flocculant use synthetic water-soluble organic polymers and copolymers, containing in its composition or amide, or carboxyl, or sulfonic, or nitrile group, can due to the adsorption of macromolecules of polymers and copolymers of the fibers and filler particles to change the magnitude and sign of the surface charge of the dispersed phase and the structure of the variance of the paper pulp, as a polymer containing a sulfonic group, use polysulfonamide MM 2500 - 3000 (KK-1), structural formula

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as the polymer containing amide group, use the copolymer methacrylamide with the ammonium salt of methacrylic acid MM 10000 - 100000 (ACS-2), structural formula

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as the polymer containing nitrile group, using a copolymer of piperylene with ACPO, use a copolymer of piperylene methacrylic acid 10000 MM (ck-4), the structural formula

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where m, n is the number of monomers in a macromolecule polymer.

2. The method according to p. 1, wherein the flocculant consumption is 0.3 kg/T.

 

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