SU128463A1 - The method of obtaining heat-resistant electrically insulating varnish - Google Patents

Description

A method of producing heat-resistant electrically insulating varnish based on products combining epoxy resins with organosilicon compounds is known.

The described method differs from the known one in that the product of co-hydrolysis of methyl- and phenylchlorosilanes and phenylaminomethylmethyldiethoxysilane is used as the organosilicon compound, which increases the cementing ability of varnish. The method is carried out in the following way.

Example. Getting phenylaminomethylmethylamine.

10 kg of chloromethylmethyldichlorosilap are loaded into the reaction kettle and 5.9 kg of absolute ethanol are added with stirring at a temperature of 20-25 ° over 4 hours. The reaction mixture is heated at a temperature of 75-80 with moving for 10 hours, then J is added 19 kg of aniline and continue to be heated at a temperature of 130-140 ° for 15 hours while stirring. After that, the product is cooled to 30-35 °, 10 kg of toluene is added and the hydrochloric acid acylin formed is filtered off. From the filtrate, toluene and aniline are distilled to a temperature of 140-150 ° (at 35 mm); the remaining cubic residue is phenylaminomethylmethyldiethoxysilane (70-72% by weight) and its partial hydrolysis product.

Example. Preparation of organosilicon polymerav hydrolyser loads 45 kg of water, 10 kg of toluene and, when transferred at a temperature of not 30-40, a mixture of 2.4 kg of dimethyl chlorosilane, 1.8 kg of methyltrichlorosilane, 5.2 kg of phenyltrichlorosilane and 10 kg of toluene is fed at a rate of 8 ten . The mixture is moved for 30 minutes and

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settle, lower aqueous cjioii; the oil is washed with water until neutral with KOHIO. The washed and microfiltrated product is reloaded into a clean tirrolizer, 200% by weight of water product is added, treated with soda solution until pH 7.5 and nrn. while stirring, 0.6 kg of phenylaminomethylmethyldiethoicieilane is slowly added. After the total amount of amine has been added, the reaction mixture is stirred for 40 minutes, the oil layer is separated, washed with water, filtered and the solvent is distilled off (50% of the weight of the loaded hydrochloric acid layer). The remaining polmer is cooled to a temperaure of 70 °, filtered through a cloth and then condensed at 120-130 ° with air blowing. The end of the condensation is controlled by the gel time. The gelatinization time is 2-3 minutes. The organosiloxane lacquer is prepared by dissolving the resulting resin in toluene to 50% concentration. Before a unbotted bleach, varnish is mixed with a 50% alcohol toluene solution (1: 1) of ED-6 resin and a 50% solution of tetrabutoxy titanium at a rate of 90% polyorganosiloxane polymer, 10% ED-6 and 1% tetrabutoxy titanium, calculated on pure products .

Subject invented and 5g

The method of obtaining heat-resistant electrically insulating lacquer based on products of combining enoxide resins with organosilicon compounds, and with the fact that, in order to improve the cementing ability of varnish, for combining with epoxy resin, the product of organosilicon is used cohydrolysis of methyl- and phenylchlorosilanes and phenylaminomethylmethyldiethoxysilane.