SU1159069A1 - Method of manufacturing electrical insulation material - Google Patents

Abstract

METHOD FOR PRODUCING ELECTRIC INSULATION MATERIAL, wherein the pulp based on cellulose fibers is cast layer was treated with each layer vrdnm solution of a mixture of nitrogen-containing compounds with posledunitsim pressing and drying the obtained multilayer preform on tlichayuschiys in that, for the purpose povyieni arc resistance material as nitrogen-containing compounds a mixture of acrylamide and carbamide, taken in a weight ratio of from 1: 5 to 5: 1, is used.

Description

1 The invention relates to the cellulose and paper industry and is advantageously to the production of cell-based electrical insulation materials used in the electrical engineering industry as an insulating material in arc extinguishing devices. High-voltage switches. A known method for producing electrically insulating materials is on. cellulose base, in which the cast layers before forming a multilayer material are treated with a Cl1 stabilizer solution. The disadvantage of this method is the low arc resistance of the resulting material. The closest to the proposed technical essence and the achieved result is a method in which layers are cast from a pulp based on cellulose fibers, each layer is treated with an aqueous solution of a mixture of nitrogen-containing compounds, followed by pressing and drying the obtained multilayer preform L2l. A disadvantage of the known method is also low arc resistance of the material. The aim of the invention is to increase the arc resistance of the material. This goal is achieved in that according to the method of manufacturing an electrically insulating material, with which pulp based on cellulose fibers are cast, each layer is treated with an aqueous solution of a mixture of nitrogen-containing compounds, followed by pressing and drying the multilayer billet, the mixture containing nitrogen is used Acrylamide and carbamide, taken in mass ratios from 1: 5 to 5: 1. Treatment of the layers with an aqueous solution of a mixture of acrylamide and urea allows an increase in the arc resistance of the material. EXAMPLE 92 a. Experimental samples of electrically insulating material from cellulose brand ZK-2, pre-ground to 45-50 ° SR, were obtained on an experimental paper machine with a format cylinder. Solutions of acrylamide and carbamide with a concentration of 30-250 g / l, taken in mass ratios from 1: 5 to 5: 1, were applied to each layer using a CO-71 pneumatic paint sprayer. The billet removed from the format cylinder was cold pressed for 15 minutes at a constant pressure rise to 2.5 MPa, then dried in a press with heated plates at 110-120 ° C at a pressure of 4.9 MPa for 30-40 minutes. Solutions of acrylamide with urea is prepared — or at 20–25 ° C. The tests of the material obtained are presented in the table. As can be seen from the table, the arc resistance of the control sample is 11.6 s, the fiber is 12.0, and the cardboard has the same thickness, but with chemical additives of acrylamide and urea, taken in ratios 1: 5, 1: 1 5: 1 is 12.6 s, 13.1 s and 13.0 s, respectively. The specific surface and volume resistances are on. fiber level, and the dielectric constant and electrical strength perpendicular to the layers are superior to the fiber sample. Thus, samples containing acrylamide and urea have the highest arc resistance in air. The use of the proposed method simplifies the process of manufacturing the material in comparison with the process of manufacturing fiber and cardboard brand BN. The proposed method eliminates contamination of wastewater with toxic discharges and allows to obtain an electrical insulation material that is not inferior to the fiber in terms of arc resistance (in air) and electrical characteristics.

Indicators

s

12.0 9.1 s

1.20 1.10

94

70 in the transverse direction, 44 65 Specific volumetric electrical resistivity - 10 1 tivlenie, Ohm-m Specific surface electrical resistance. 1 10 1, Ohm Electric strength, kV / mm perpendicular to 1414, 7.9, m Dielectric, 10 4.2 m The tangent of dielectric loss angle at 50 Hz,% 5.84 14 Nitrogen content,%

11.6

12.6

13.1

13.0

1.20

1.19

1.20

1.18

72

76

68, 1-10 ° 1.1-10 ° 1.1-10, 1-10 1.1 1.1-10 7.517.917.0 4.50. 4,564,50 6,5014,0015,00

.0.15. 1, 50.4

6-86-8

Table continuation

0.5

0.5

0.5 6-8 6-8 6-8

Claims (1)

METHOD FOR PRODUCING ELECTRICAL INSULATION MATERIAL, in which a layer is cast from a pulp based on cellulose fibers, each layer of water is treated with a solution of a mixture of nitrogen-containing compounds, followed by pressing and drying the resulting multilayer preform, which is characterized in that, in order to increase the arc resistance of the material, nitrogen-containing compounds use a mixture of acrylamide and urea, taken in mass ratios from 1: 5 to 5: 1. U, „1159069 1 15 9069