Method for preparing pentamethyl disiloxane
A technology of pentamethyldisiloxane and methyl, which is applied in the field of preparation of pentamethyldisiloxane, can solve the problems of low yield and high product cost, achieve high hydrolysis purity, good industrial value, and increase yield and the effect of purity
Active Publication Date: 2010-11-03
中国中化股份有限公司 +1
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In order to overcome the shortcomings of high product cost and low yield in the existing preparation methods, the present invention is committed to developing a new preparation method
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The invention discloses a method for preparing pentamethyl disiloxane. In a reaction formula below, R may be methyl, ethyl, propyl, phenyl or ethenyl; and X may be a chlorine atom or bromine atom; n is an integer ranging from 4 to 100. Reaction steps include: (1) adding high-hydrogen silicone oil represented by a formula III into a Grignard reagent to perform a Grignard reaction in the presence of an ether solvent and a cosolvent; and (2) adding water to perform a hydrolysis reaction to prepare the pentamethyl disiloxane represented by a formula I. The method has high reaction yield and high product quality and is suitable for industrial preparation.
Description
technical field The invention belongs to the field of organosilicon chemical synthesis, and in particular relates to a method for preparing pentamethyldisiloxane. Background technique Pentamethyldisiloxane is an extremely important organosilicon intermediate. This compound has active silicon-hydrogen bonds and can be used as a monomer for the synthesis of organosilicon polymers. It can also be added to carbon compounds to form silicon-carbon Polymers can also link silicone rubber, silicone oil, and silicone resin to modify their properties, and are also raw materials for synthesizing special surfactants. Therefore, pentamethyldisiloxane plays an extremely important role in synthetic silicone products. The methods for preparing pentamethyldisiloxane disclosed in the prior art all use dimethylchlorosilane or its derivatives as raw materials and prepare by hydrolysis method: Japanese Patent Publication JP64031791 uses dimethylethoxysilane and Trimethylchlorosilane is used as...
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Inventor 喻滔刘冬雪贾俊吴玉春付洪娥魏峰肖洋
Owner 中国中化股份有限公司