A method of manufacturing paper pulp

 

(57) Abstract:

The method applies to obtain paper pulp for the production of printing the book and magazine paper. Prepare a water-fibrous dispersion of cellulose, mass fill, calcined, as a coagulant add aluminum sulfate, and synthetic flocculant water soluble Plastigel representing the copolymer with alternating structure of parts of acrylic and phenylacrylate acids, phenylacetamide and ammonium salts of acrylic acid, subjected to chemical modification-linking of macromolecules. The method allows to increase the degree of retention of paper pulp on a grid table, the PM and the degree of retention of the filler, to improve the property of paper, to reduce the consumption of flocculant to reduce wood consumption. 1 C.p. f-crystals, 1 table.

The invention relates to the field of pulp and paper industry, namely the method of production of paper pulp in the production of printing, book and magazine paper.

From a large number of organic polymers, synthesized both in Russia and abroad, and which is the potential of the auxiliary additives in the manufacture of paper, have been studied as flocculants ogran the other to streamline the process, improve the quality of the paper is given in the publications [3, 4]. Monomeric structure and functional composition are not published [5].

Currently, PPI is widely used polymer imported - polyacrylamide. Closest to the claimed invention is a method of manufacturing paper pulp [6], we have chosen 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.

The disadvantages of this method are: low degree of retention of pulp and kaolin, resulting fine fibers and particles of kaolin go into the waste water, as well as low quality paper.

Known composition of the gel complexes, which can be used as flocculants [7].

In [8] it is shown that the total surface charge of the dispersed phase of a suspension of wood materials and filler has the greatest influence on the strength of coupling between the individual fibers and filler particles and, consequently, the degree of retention of the mass and mechanical pocai 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 the new Patriotic polymer Plastigel as a flocculant in the production of printing and book and magazine paper in the pulp and paper industry, which can 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 the technical result, which is in causal connection with the essential features.

The essential feature of the invention is the preparation of an aqueous fiber dispersion, filling, sizing and sedimentation with coagulant and flocculant, is used as a coagulant aluminum sulfate, and as a flocculant - synthetic water-soluble organic copolymer of Plastigel representing the copolymer with alternating structure of parts of acrylic and phenylacrylate acids, phenylacetamide its high gelling properties. Consumption of Plastigel is 0.1 - 0.3 kg/so the Application of Plastigel allows for the adsorption of its molecules on the fibers and filler particles to modify the surface charge of the dispersed phase, to modify the structure of the dispersion of paper pulp, to enhance the flocculation of paper pulp, thereby significantly increasing the degree of retention of pulp and filler on a grid-style PM. This dramatically increases the quality of the paper is reduced flocculant consumption, and, ultimately, the wood consumption per unit of production is reduced.

Castings were prepared listonline apparatus LA-2 JSC (the Central laboratory Syktyvkar LPK"). Determination of physico-mechanical characteristics of the products was carried out according to GOST 13525.1-79, STSM 2416-80, GOST 7690-66.

The surface energy of the dispersed phase of the pulp was determined by the method of reverse potentiometric titration [9].

Example 1. Preparing fibrous mass containing 30% softwood pulp, 50% hardwood pulp, 20% thermomechanical pulp. To the fibrous mass is added to the filler is kaolin at a flow rate of 140 kg/t, the adhesive at the rate of 21 kg/t as add flocculant polyacrylamide at a flow rate of 0.44 kg/t, and as to 5 kg/t, the pH of the 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 and 57.3%, ash content of paper is 7.3%, the resistance of the surface to picking - 1,33, the degree of dust - 0,35%.

Example 2. Preparing fibrous mass of example 1. To the fibrous mass is added to the filler is kaolin at a flow rate of 140 kg/t, the adhesive at the rate of 21 kg/t, as a flocculant is used Plastigel at a flow rate of 0.29 kg/t, aluminum sulfate at a flow rate of 45 kg/t, cationically starch adhesive at the rate of 5.5 kg/t, pH mass - 4,65, the surface charge is positive. Results: the reported mass of 91.6%, retention of kaolin - 79,5%, ash content of paper - 10,9%, the resistance of the surface to picking - 1,26, the degree of dusting is 0.33%.

Example 3. Preparing fibrous mass containing 15% softwood pulp, 10% hardwood pulp, 75% thermomechanical pulp. To the fibrous mass of kaolin is added at the rate of 140 kg/t, the adhesive at the rate of 21 kg/t, as a flocculant used aluminum sulfate at a flow rate of 45 kg/t, cationically starch adhesive at the rate of 5.5 kg/so results: the rate of dehydration - 0,36 l/min, ash bume 4. The composition of the paper pulp is the same as in example 3. As floculent instead of polyacrylamide is added to Plastigel at the rate of 3 kg/so results: the rate of dehydration - 0,41 l/min, the ash content of the paper is 6.7%, breaking length - 3080 m, the resistance of the surface to picking a 1.25 degree dusting of 0.40%.

Example 5. The composition of the paper pulp is the same as in example 3. As the flocculant added to the copolymer of Plastigel at a flow rate of 0.2 kg/so results: the rate of dehydration - 0.34 l/min, the ash content of paper - 8,7%, breaking length - 3460 m, the resistance of the surface to picking a 1.25, degree of dust - 0,45%.

Example 6. The composition of the paper pulp, the consumption of kaolin and all additives as in example 3. As flocculant used Plastigel at a flow rate of 0.1 kg/so results: the rate of dehydration - 0,32 l/min, the ash content of paper - 8,9%, breaking length - 3720 m, the resistance of the surface to the plucking is 1.35, the degree of dust - 0,35%.

Example 7. The composition of the fibrous mass consumption of kaolin and all other additives as in example 3. But in this example, as the flocculant used is a copolymer of Plastigel at a flow rate of 0.3 kg/t, and as a coagulant - titanyl sulphate and ammonium at a flow rate of 6 kg/so results: the in - 1,32, the degree of dust - 0,38%.

As follows from the presented data (see table), the use of a new domestic water-soluble copolymer under the trade name "Plastigel" as a flocculant comprising paper pulp in paper production can improve retention mass by 43%, 38% increase retention of kaolin, to increase the rate of dehydration and to significantly improve the physico-mechanical indicator "breaking length". Thereby substantially reducing the amount of wood per unit of output.

Literature

1. Mayor E. M. Synthetic polymers in the paper industry. - M.: Forest industries, 1986, S. 247.

2. Asadov Z. G. Aliev C. S. Synthesis, properties and use of polymers and copolymers. - USP. 1992, I. 61, vol.5, S. 1002.

3. Floculation of cellulosic fiber/L. Wagberg Nordic Pulp and Paper Res. Y. - 1993, N 4, p.152-160.

4. Polymers at interfaces and in disperse system/Vinsent B., Whittington S. In: Surface and Colloid Science. Vol. 12. New-York, 1987, p.1-117.

5. Polimer-sistem fur nene anallitatlassen angestrichentr Druckhfhier/W Auru U Riebeling R//Das Papier, 1989-10 AS 24-36.

6. Ivanov, S. N. Technology paper. M: Forestry, 1970.

7. Lopatin centuries, Fedyukin A. C. Flocculation fibrous suspensions gel formations. - Colloid journal, 1992, 54 so the flocculants on the full surface energy components of paper pulp in the presence of coagulant/abstracts of the 2 Meeting "wood chemistry and organic synthesis". 1-4 Oct.1996, Syktyvkar, S. 124.

9. Fredriksberg D. A. Course of colloid chemistry. L.: Chemistry, 1984, S. 176.

1. A method of manufacturing paper pulp, comprising the preparation of an aqueous fiber dispersion, filling, sizing and sedimentation with coagulant - aluminium sulphate and flocculant, characterized in that as a flocculant use synthetic water-soluble copolymer of Plastigel representing the copolymer with alternating structure of parts of acrylic and phenylacrylate acids, phenylacetamide and ammonium salts of acrylic acid, subjected to chemical modification - linking of macromolecules.

2. The method according to p. 1, characterized in that the flow Plastigel is 0.1 - 0.3 kg/T.

 

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