SU1251190A1 - Electric insulation composition - Google Patents

Abstract

The invention relates to electrical engineering, in particular to electrically insulating compositions for the preparation of protective coatings applied to high-voltage and bushing insulators. The purpose of the invention is to improve the performance characteristics of coatings by improving the adhesive properties and the processability of applying and removing the coating from the substrate. The electrically insulating composition contains, in wt%, a 15% solution of casein 4-6; paraffin emulsion of 1.5-2.5; 25% ammonia solution 0.1-0.3; the filler is zinc oxide 0.5-0.7; the high molecular weight compound is dimethyl methacrylate latex else. To obtain a protective coating, a casein solution is preliminarily prepared and, with stirring, is introduced into hot water containing a concentrated ammonia solution. Paraffin is injected into the lattex mixture in the form of an emulsion containing paraffin, oleic acid and water. It increases the elasticity of the latex film, increases the water resistance and resistance to aging under the action of ultraviolet radiation. Zinc oxide is introduced into the mixture as a powder last, as it causes thickening of the latex. The latex mixture, having sufficient viscosity, can be applied to the surface of the insulators with a pneumatic spray. 2 tab. YO SL

Description

The invention relates to electrical engineering and can be used, in particular, for the preparation of protective coatings applied to high-voltage and bushing insulators.

The purpose of the invention is to improve the performance of coatings based on electrically insulating compb. position by improving the adhesive properties and the processability of applying and removing the coating from the substrate.

To obtain a protective coating, a 15% casein solution was previously prepared. Casein is weighed and impregnated with distilled Water for 1-2 hours. The obtained cMecfc is injected with stirring into hot water containing concentrated (25% amt-gaak solution. Ammonia is added to prevent damage to the latex mixture containing substances subject to destruction under the influence of bacteria (casein, starch, etc.).

Paraffin is introduced into the latex mixture in an emulsion containing, by weight, paraffin -4; oleic acid 1; water 5. The preparation of the emulsion and its mixing with the latex are carried out on a steam bath at 70-80 ° C. Introduction

Latex DMMA-65 GP

The Rest The Rest The Rest The Rest

para4) ina in the latex mixture increases the elasticity of the latex film, increasing its resistance to water and aging resistance under the action of ultraviolet radiation. To increase the strength of the film, zinc oxide powder is introduced into the mixture. The sequence of the Ingredient Ingredients is irrelevant, with the exception of zinc oxide, which should be added last, as it causes thickening of the latex.

To obtain a protective coating, latex mixtures were prepared, the compositions of which are listed in Table 1.

Table 2 shows the properties of coatings based on these compositions.

Latex mixture, has enough. exact viscosity in the operating temperature range, and can be applied to the surface of the insulators with a pneumatic sprayer, which allows to increase labor productivity and reduce labor costs during maintenance of switchgears. In addition, it can be used to protect process equipment operating in contaminated areas.

Table I

Will satisfy.

Also

Good

Bad Same

Flows Do not flow The same The same The same

Claims (1)

Invention Formula An electrically insulating composition for coatings of predominantly high-voltage insulators, including high-molecular compounds and a filler, characterized in that, in order to improve the performance characteristics of coatings based on it by improving the adhesion properties and the processability of applying and removing the coating from the substrate, it additionally contains 15% casein solution, paraffin emulsion. Editor A. Ogar Compiled by A. Kruglikov Tehred I. Gajdosh Proof-reader E. Roshko 4419/51 Shooting gallery 643Subscribe VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Table Good good The same the same 8-10 The same the same 10-12 Bad The same 12-15 o Same Satisfaction. 15-20 25% ammonia solution, contains a dimethyl methacrylate latex as a high-molecular compound, and zinc oxide as a filler, with the following content of ingredients, in May.%: 3% casein solution4-6 Paraffin emulsion, 5-2.5 Zinc oxide 0.5-0.7 25% ammonia solution 0.1-0.3 Dimethyl methacrylate latex Else