SU1152989A1 - Method of producing electric insulation paper - Google Patents

Abstract

1. METHOD OF MANUFACTURING ELECTRICAL INSULATION PAPER, including dissolving a cellulose-containing semi-finished product, its preliminary grinding, swelling by hydrodynamic processing, main grinding and reflux, characterized in that, in order to increase the electrical strength of paper and reduce the dielectric loss tangent of paper, impregnated, imitation paper, impregnated dimples, and imbibed paper. reduce energy consumption, as the cellulose-containing semi-finished product, sulphate unbleached pulp with a polydispersity of 1.07-1.83, hardness of 110-125 p is used p-manganate units and a content of sodium ions of 11-70 mg / kg of absolutely dry cellulose or its mixture with unbleached sulphate pulp, polydispersity of 1.03-1.06, hardness of 128-130 and content of sodium ions up to 10 mg / kg of completely dry cellulose , and dissolution and swelling are registered in a salt solution of a polyvalent 3 metal with a concentration of 0.002-6,000%, 2. The method according to claim 1, which is also distinguished by the fact that cellulose with a lidispersity 1.03-1.06, a hardness of 128- 130 take in the amount of 5-80% by weight of the mixture. 3. The method according to claim 1, which is also distinguished by the fact that magnesium sulphate or zinc acetate is used as the salt of the JV NJ polyvalent metal. QD 00 CD

Description

The invention approaches the manufacture of insulating paper with low dielectric losses and increased electrical strength and is intended for use in the pulp and paper industry. The purpose of the invention is to increase the electrical strength of electrically insulated paper, reduce the tangent of the dielectric loss angle of paper impregnated with trichlorobiphenyl, as well as reduce energy costs. The proposed method for the manufacture of electrically insulating paper includes the dissolution of cellulose-containing semi-finished products, which use unbleached sulphate pulp with a polydispersity of 1.071, 83, a hardness of 110-125 permanganate units and a content of sodium ions of 11-70 mg / kg of absolutely dry pulp or its mixture with sulphate unbleached pulp, polydispersity of 1.03-1.06, hardness 128-130 and content of sodium ions up to 10 mg / kg of absolutely dry pulp, its preliminary grinding, swelling by hydrodynamic processing , while dissolution and swelling are carried out in a saline solution of a polyvalent metal with a concentration of 0.002–6,000%, followed by basic grinding and reflux. Cellulose with a polydispersity of 1.03-1.06, a hardness of 128-130 is taken in the amount of 5-80% by weight of the mixture. As the polyvalent metal salt, magnesium sulfate or zinc acetate is used. Cellulose grades, their ratio, salt solution concentration and paper dielectric characteristics are shown in Table 1. Unbleached sulphate pulp with a polydispersity of 1.07-1-83, a hardness of 110-125 permanganate units and a content of sodium ions of 1570 mg / kg of absolutely dry pulp or hers. a mixture with unbleached sulphate cellulose with a polydispersity of 1.0 1.06, a hardness of 128-130, and a content of sodium ions of 5–10 mg / kg of absolutely dry cellulose is dissolved in the left polyvalent solution. metal, for example magnesium sulfate, zinc acetate. Then the mass, with a concentration of 3.0-3.5%, enters the accumulative basin, from where it is fed for preliminary grinding to the degree of grinding of 35-40 ° SH. After that, the mass enters the swelling pool with a capacity of 25–30 m. During the swelling, the mass is in saline solution and hydrodynamic motion for 9 hours, then it is washed with deionized water from excess electrolyte solution and is fed to the main grinding and reflux. The degree of grinding of the finished mass reaches 98.6 ° SR. Examples 1-3. As the salt of a polyvalent metal, magnesium sulfate with a concentration of 3% is used, and the raw material is cellulose of grade E-1 with different polydispersity, hardness and content of sodium ions. Examples 4-6. The raw material used is cellulose 3-2, identical to the cellulose of grade E-1 with different degree of dispersion, hardness, content of sodium ions, magnesium sulphate concentration is 6; 0.002; 3%. Example 7-10. The raw material used is a mixture of cellulose in various combinations; The magnesium sulfate concentration is changed (Table 1). Example 11. As a polyvalent metal take zinc acetate with a concentration of 0.05%. In all examples, the resulting capacitor paper with low dielectric losses was analyzed according to GOST 1908-77. The electrical strength indices depending on some characteristics of cellulose, as well as the dielectric loss tangent in the impregnated TCD form on the concentration of the salt solution in comparison with the indicators of the prototype are given in Table 1. Table 2 shows some qualitative indicators of capacitor paper made according to the invention, in comparison with the prototype, and the saving of electricity is shown.

T a b l and c a I

Table

OfferOffer

Prototype

Continued table. 2

Claims (3)

1. METHOD FOR PRODUCING ELECTRIC INSULATION PAPER, including the dissolution of cellulose-containing semi-finished product, its preliminary grinding, swelling by hydrodynamic processing, the main grinding and casting, characterized in that, in order to increase the electric strength of the paper and reduce the tangent of the dielectric loss angle of the paper impregnated with trichloride also reducing energy costs, as a cellulose-containing semi-finished product, sulfate unbleached pulp is used with a polydispersity of 1.07-1.83, stiffness 110-125 permangan units and a content of sodium ions of 11-70 mg / kg of absolutely dry cellulose or its mixture with sulphate * unbleached pulp, polydispersity of 1.03-1.06, hardness of 128-130 and a content of sodium ions up to 10 mg / kg of absolutely dry cellulose, and dissolution and swelling is carried out in a saline solution of a polyvalent metal with a concentration of 0.002-6,000%. 2. The method of pop. ^ characterized in that the cellulose with a polydispersity of 1.03-1.06, hardness 128-130 take in the amount of 5-80% by weight of the mixture. 3. The method of pop. 1, the difference is that magnesium sulfate or zinc acetate is used as the salt of the polyvalent metal.