Addition type organic silicon resin as well as preparation method and application thereof

Abstract

The invention discloses addition type organic silicon resin, a preparation method of the addition type organic silicon resin and application of the addition type organic silicon resin to preparation of low-volatilization single-ingredient addition organic silicon impregnating varnish. The addition type organic silicon resin has a structure general formula of (Me3SiO0.5)m(MeHSiO)n(MeViSiO)q(PhSiO1.5)t, wherein the m is an integer being 1 to 20; the n is an integer being 1 to 30; the q is an integer being 1 to 10; the t is an integer being 2 to 60. The preparation method is characterized in thata silane mixture containing alkoxy silane and chlorosilane is used as a raw material; the raw material is sequentially subjected to hydrolysis-condensation reaction, end capping reaction and aftertreatment to prepare the addition type organic silicon resin. The addition type organic silicon resin with narrow molecular weight distribution and extremely low residual hydrogen chloride content is prepared by the process; the addition organic silicon impregnating varnish is prepared by using the addition type organic silicon resin as raw materials; the volatile quantity at 200 DEG C / 1h is extremely low.

Description

technical field [0001] The invention relates to the technical field of silicone resins, in particular to an addition-type silicone resin and its preparation method and its application in the preparation of low-volatility one-component addition-type silicone dipping varnish. Background technique [0002] Silicone impregnating varnish is a kind of important insulating material based on silicone resin. It is a kind of thermosetting polysiloxane system with highly cross-linked structure. A polyorganosiloxane with a highly cross-linked network structure. Silicone dipping varnish can be divided into condensation type and addition type according to different crosslinking and curing methods. Condensation-type silicone impregnating varnish is a silicone resin prepolymer containing Si—OH, Si-OR and other groups, which is further condensed and cross-linked into a solid product under the action of a catalyst or heated; The polysiloxane with -Vi bond and the siloxane with Si-H bond und...

AI Technical Summary

Problems solved by technology

The main disadvantage of this technical solution is that the silicone impregnating varnish consists of two main components, that is, a two-component addition type silicone impregnating varnish, the industrial preparation of which involves extremely high costs and complex In addition, the volatile content of the silicone impregnating paint is at least 0.9% at 180-200 ° C. Although it meets the national standard GB15022-2007, it cannot meet some technical fields that have higher requirements for volatile content.

[0006] Another example is that the Chinese patent literature with the publication number CN 101070386 A discloses a method for preparing a one-component H-siloxane-containing addition-crosslinkable silicone resin, which is composed of a one-component silicone resin, but has the disadvantage of Because all the raw materials use chlorosilane mixture, a large amount of HCl is released during the hydrolysis process, which is very easy to cause environmental pollution and equipment corrosion, and the reaction is violent and difficult to control

Although a 0.01-1.0% concentration aqueous solution of a base with a pH value of 7.0-8.5 is used in this preparation process to wash the phase comprising a one-component H-siloxane-containing addition-crosslinkable silicone resin to reduce the residual HCl content, However, this washing process is prone to dehydrogenation reaction, which reduces the hydrogen content in silicone resin.