Preparation method of vinyl tri(dimethylsiloxane) silane

Abstract

The invention relates to a preparation method of vinyl tri(dimethyl siloxane) silane, which includes steps of firstly, mixing catalyst, methanol and water to obtain mixed fluid A; feeding tetramethyldisiloxane in mixed fluid A, stirring and heating to 20-100 DEG C to react and obtain mixed fluid B; dropwise adding vinyl trimethoxy silane in mixed fluid B to continue reaction; completing reactionto obtain mixed fluid C; separating the mixed fluid C and cleaning by water; taking supernatant liquid, drying, filtering and distilling the supernatant liquid to obtain a finished product. The raw material applied to the method contains siloxane, and has low equipment quality requirement; moreover, the reaction is free from side product hydrochloric acid, and does not need massive water washing and alkali washing; the technique is simple and flow is short; meanwhile, the preparation method does not need to strictly control low temperature, the reaction temperature is gentle, and easy to control; the prepared product yield is up to 84.8%; after distilling and purification, the product purity is up to 98%, and the purity is high.

Description

technical field [0001] The invention belongs to the technical field of new silane materials, and in particular relates to a preparation method of vinyl tris(dimethylsiloxane) silane. Background technique [0002] Vinyltris(dimethylsiloxy)silane, having the following structural formula: [0003] [0004] Vinyl tris(dimethylsiloxane)silane is mainly used in silane cross-linked polyethylene cables and pipes, and can also be used in low-smoke halogen-free cables to improve the oxygen index of cables. As a water-repellent agent, it can be used to disperse organic coatings and improve the water resistance of coatings. This substance contains silicon-hydrogen bonds and has the properties of further processing. According to different requirements, functional groups can be introduced in a directional way, and it can be used as functional silicone oil or coupling agent. It is a high-quality intermediate. [0005] In the prior art, the most traditional method for preparing vinyl t...

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Problems solved by technology

[0006] (1) The reaction raw material is chlorosilane, which requires high quality reaction equipment, and produces a large amount of by-product hydrochloric acid in the reaction;

[0007] (2) The low temperature (around 0°C) needs to be strictly controlled during the reaction process. If the temperature is too high, the raw materials will be severely hydrolyzed and the product yield will be reduced;

[0008] (3) Exothermic heat is serious in the reaction process, and the strict requirement to temperature makes reaction carry out slowly;

[0009] (4) After the reaction is completed, the synthetic solution is strongly acidic, and needs to be washed with a large amount of water and alkali to neutrality, then dried, filtered, and distilled to obtain the finished product. The process is complicated

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