Preparation method for methylphenyl silicone resin and coating

Abstract

The invention provides a preparation method for a methylphenyl silicone resin and a coating. The preparation method comprises the following steps: using total or partial methyl trichlorosilane, dimethyldichlorosilance, phenyl trichlorosilane and dichlorodiphenylsilane to be combined as a monomer raw material, performing cohydrolysis in the presence of an organic solvent incompatible with water, generating organic siloxane alcohol, adding a nucleophilic reaction catalyst to 8% of tetramethylammonium hydroxide butanol solution, performing catalytic condensation, finally preparing an organic silicon resin polymer with a specific structure and high reactivity, weighing 20 g of the prepared methylphenyl silicone resin, adding a curing agent of butyl titanate, uniformly stirring for 1 h, uniformly coating on a substrate of an iron material, curing for 2-3 days in a room temperature, successfully constructing the methylphenyl silicone resin coating. The provided preparation method is capableof improving the yield, completely solving a fundamental defect of a thermal condensation silicone resin that the viscosity is returned after curing, and completely curing in the room temperature, hasthe good high-temperature and low-temperature resistance, and has the extensive application prospect.

Description

technical field [0001] The invention relates to a method for preparing a silicone resin, and the invention also relates to a method for preparing a silicone resin coating. Background technique [0002] With the continuous increase of the flight speed of solid rockets, supersonic aircraft and aerospace vehicles, the requirements for the temperature and thermal shock that the aircraft must withstand are getting higher and higher. When the temperature reaches 250-316°C, in order to protect the shell material and internal structure from damage, it is necessary to coat a layer of high-temperature resistant coating on the surface of the shell material. Silicone resin has the characteristics of excellent heat resistance, dielectric properties, weather resistance, low thermal expansion coefficient and light weight, so silicone resin is a promising coating material in aerospace, electrical equipment, It has a wide range of application value in the automobile industry and other indus...

AI Technical Summary

Problems solved by technology

[0005] The preparation method of the currently reported methylphenyl silicone resin coating has the following problems. During the synthesis process, the monomer is emulsified, and after the monomer is hydrolyzed, a turbid or milky white solution is obtained, and the yield is low.

Most methylphenyl silicone resins are cured at high temperature, the curing temperature is above 200°C, it is difficult to cure at room temperature, and the resin is anti-adhesive after curing.

And, the heat resistance performance of some methylphenyl silicone resin coating disclosed at present still needs to be further improved

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