SU1742867A1 - Method of paper film dielectric manufacture - Google Patents

Abstract

Use: manufacture of paper-film dielectrics. The purpose of the invention is to reduce the cost of the dielectric while maintaining its electrical insulation properties and improve the eco-friendliness of the production method. Condenser paper is impregnated with a solution of polyethylene in white spirit or decane at 140-150 ° C and dried. A dielectric is obtained with a dielectric strength of 162-200 kV / mm and a dielectric loss tangent at 100 ° C 0.185-0.239. 1 з „p f-ly, 1 tab. (L with e oo o -v |

Description

The invention relates to a method for manufacturing a paper-film dielectric and is intended for use in the pulp and paper industry.

Methods are known for improving the electrical strength of paper by treating paper pulp or finished paper with chemical reagents .:

surface treatment of paper with gaseous oxygen, ozone or hydrogen sulfide, hydrocarbons in gasoline or by adding hydrazine hydrate to the pulp before grinding, treatment with chitosan solution in acetic acid, the introduction of boric acid into „pulp or paper.

However, the known methods are practically difficult due to the complexity, fire hazard ™ or toxicity.

To improve the quality of paper dielectrics, a method of making paper dielectric, a combination of

paper and synthetic paper.

This dielectric has improved electrical insulation properties, however, the comparatively high cost is characterized by insufficient stability of the electrical properties.

The closest to the present invention is a method of manufacturing a paper-film dielectric, comprising applying a synthetic polymer solution (polystyrene, polyvinylcarbazole, polypropylene) onto the base paper with the following drying of the finished material. As a solvent for polypropylene, xylene is used, for polystyrene and polyvinylcarbazole - dichloromethane

A disadvantage of the known method of manufacturing a paper-film dielectric is the use of a highly toxic solvent for dissolving a synthetic polymer, which leads to deterioration of working conditions, pollution of the environment, the need to install additional equipment for trapping and recovering a toxic solvent. All this causes an increase in the duration of the technological process and an increase in its cost.

The aim of the invention is to reduce the cost of the dielectric while maintaining its electrical insulating properties and improving the environmental friendliness of the method.

The goal is achieved by the method of manufacturing a paper-film dielectric, in which a solution of a synthetic polymer in an organic solvent is applied to paper, polyethylene is used as a polymer, and white spirit or decane is used as a solvent, while the temperature of the solution when applying Yo-150 ° C.

Low or medium pressure polyethylene is used as polyethylene.

Example 1 ABCON 1-12 Condenser paper is impregnated with low pressure polyethylene (PE) grade 20508-007. The concentration of PE in the decane solution is 100 g / l. Polyethylene solution

0 solution

5 g

Lena is prepared by mixing calculated amounts of powdered polyethylene with a solvent, which is then heated in a heating cabinet. The dissolution of PE begins at 90 ° C, complete dissolution occurs at

with light

YO-15SSS for 10-20 with mechanical stirring.

The duration of the impregnation of the paper and the solution of PE 1.0 min at YO ° C. After the impregnation is complete, the paper is removed from the impregnation bath and dried in the same oven over solvent vapor for 1.5 minutes.

PRI mme R 2. MKON-brand condenser paper is impregnated in a solution of PE at an average pressure in air-spirits in a heat chamber at. Prepare the same as described in example 1. The duration of the impregnation of 1.0 minutes The concentration of PZ in a solution of 80 g / l. Dry over solvent vapors for 2.0 minutes.

PRI me R 3. Condenser paper brand EMKON, 5 is impregnated in a solution of PE in decane for 0.5 min at a temperature in the oven 150 ° C. The preparation of the PE solution is similar to that described in Example 1. Drying is carried out in the same heating cabinet for 2.0 minutes. The concentration of PE in the solution is 150 g / l.

The table presents the results of dielectric tests made by the known and proposed method.

Comparative analysis of the data presented in the table shows that the dielectric obtained by the proposed method has the same performance as the known.

The use of the invention allows to improve the environmental friendliness of the material manufacturing process, reduce its cost by using cheaper and more affordable polyethylene and solvents, eliminate the use of additional technological equipment, improve working conditions, protect the environment from harmful emissions.

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Claims (2)

1. A method of manufacturing a paper-film dielectric, in which a solution of a synthetic polymer in an organic solvent is applied to paper, characterized in that, in order to reduce the cost of the dielectric while maintaining its electrical insulation properties and improve the environmental friendliness of the method , as a solvent - white spirit or decan, with In this case, the temperature of the solution in the course of NI is 1 0-150 ° C. 2. The method according to claim 1, about 1 t and i and the fact that polyethylene or medium pressure is used as ethylene Suggested examples Note. The thickness of the polymer layer is given in brackets, applied to one side of the paper. In the known method, paper with a density of 1.2 g / cm was used as a base paper.