The method of obtaining electrical insulating coating


H01B19H01B3/14 -

 

(57) Abstract:

Usage: in electrical engineering, namely, when receiving insulating coatings on metal, fiberglass, asbestos, Lodomeria and other object of the invention is the improvement of thermal stability of electrical insulating and mechanical properties. The inventive composition containing (wt. % ) rubber siloxane block copolymers 30 - 33, ORGANOTIN orthophosphoric acid 1 - 5, an organic peroxide, 1 to 2, an organic solvent else, is applied to the material and thermoablative at 300 - 600C.

The invention relates to electrical engineering, namely to receive insulating coatings on metal, fiberglass, asbestos, Lodomeria, etc. that are used in electrical devices. Known methods for producing insulating coatings based on silicone rubbers structural formula HO - -O-- -O - R , where R= H, CH3and other

RII, RIII, RIVdifferent organic radicals.

For example: CH3C6H5, CF3CH2CH2and other

a, b - any number from 0 to 100; a+b+c= 100; c= 0-1,0.

The disadvantage of insulating coatings obtained on the basis of siloxanes is donosti, stability requirements for electrical devices. Significant disadvantages of insulating coatings on the basis of these siloxane rubber is insufficient stability at elevated temperatures. There are also known ways (1, 2). In the described methods of obtaining electrical insulating coatings applied silicone rubbers, fillers and structuring agents. For example, according to (1), the coating corresponds to the following ratio of components, wt. including :

methylvinylsiloxane oligomer 100 methyltris-(Tres-BUTYLPEROXY) silane 1.5 to 2.0 oligoanalgesia-siloxane (Selatan) 4,0-8,0

The second example, according to (2), the coating produced on the metal surface (wire) layer of polyarylate-siloxane block polymer, characterized in that it further comprises a layer of polymethyl(ethyl)-hydrosilation. The disadvantages of the known methods of obtaining electrical insulating coatings is the poor resistance to high temperatures.

Closest to the technical essence and the achieved effect is a method of applying a coating (3) on the metal on the surface based on the solution of the following composition, wt. % : polyaryletherketones block copolymer 15-25 poliatilmocevina carried out in the three furnaces at temperatures in the zones:

60 10aboutC; 80 10aboutC; 250 25aboutC.

The disadvantage of this method of obtaining electrical insulating coating is the lack of stability at a temperature of 300aboutC. At an exposure of 24 hours at a temperature of 300aboutWith weight loss film reach 20% , which causes a sharp decrease in the dielectric and mechanical properties.

The aim of the invention is to improve thermal stability of the electrical and physico-mechanical properties of the insulating coating. To achieve this goal using rubber siloxane block copolymer with the chemical structure (1): where m= 100-300, n= 6-12, as a mixture of structuring agent mixture organoiron orthophosphoric acid and organic peroxides in the following ratio of components (wt. % ): siloxane rubber, Blocco - polymer (1) of 30.0-33.0 ORGANOTIN orthophosphoric acid 1,0-5,0 organic peroxide 1,0-2,0 organic solvent else

After removal of solvent, the heat treatment of the coating is carried out at 300. . . 600oC in air atmosphere.

Feature of the proposed method is the use of siloxane rubber blockcopolymer with chemical stroitekhnosistem solutions shows thermal stability, electrical and mechanical properties are significantly improved.

Specific examples of wt. including : 1. Rubber siloxane block copolymer (1) 33.0 Tennisport 1.6 benzoyl Peroxide 0.4 Toluene rest 2. Rubber siloxane block copolymer (1) 32.5 tricresylphosphate 3.5 Peroxide Dicumyl 1.5 Petrol boot the rest

3. Rubber siloxane block copolymer (1) 31,0 Crazyforfood 3.5 benzoyl Peroxide 2.0 Toluene and kerosene else

The components of examples 1, 2, 3 are mixed as follows.

Siloxane rubber block copolymers (1) is dissolved by stirring and additional heating to 60aboutSince, in the resulting mass is injected organophosphorus compound and an organic peroxide, lead to a homogeneous condition.

After soaking and cooling select the control sample and test process suitability. Further, the compositions of examples 1, 2, 3 is applied by brush, spray, dipping or other methods on the surface of the material, remove volatiles and then heated in air to a temperature of 300-600aboutC.

The obtained electrically insulating coating on the metal, saladini has a high temperature resistance is cm tangent of dielectrics - fir loss of not more than 0.01 dielectric strength of 40 MV/m

Electrically insulating coating, obtained by the proposed method, after exposure at a temperature of 300aboutC for 200 h stores the high dielectric characteristics, the weight loss of electrical insulating coating does not exceed 2% , retains elasticity. (56) USSR Author's certificate N 1481245, CL N 01 3/40, 1986.

USSR author's certificate N 936041, CL N 01 3/40, 1980.

USSR author's certificate N 634776, CL N 01 3/40, 1970.

The METHOD of OBTAINING electrical INSULATING COATING, wherein the block copolymer siliconsamurai rubber and a mixture of structuring agent is dissolved in an organic solvent, is applied onto the substrate, then removing the solvent and thermoablative, characterized in that, to improve thermal stability of the coating, as the block copolymer used rubber-siloxane block copolymer chemical structure

< / BR>
where m = 100 - 300; n = 6 - 12,

as a mixture of structuring agent is a mixture of organoiron orthophosphoric acid and organic peroxides in the following ratio, wt. % :

Rubber-siloxane block copolymers with a specified chemical structure 30,0 - 33,0

ORGANOTIN orthophosphoric acid 1,0 - 5,0

orites heat treatment of the coating is carried out at 300 - 600oC in air atmosphere.

 

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