Method for preparing hydroxyalkyl disiloxane

A technology of hydroxyalkyl disiloxane and hydrochlorosilane, which is applied in the field of synthesis of organosilicon compounds, can solve the problems of unsuitability for industrial production, high operation requirements, and difficulty in purification, and achieve simple steps, mild conditions, and easy industrialization The effect of production
CN106905356AActive Publication Date: 2017-06-30SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2017-06-30

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Abstract

The invention relates to a method for preparing hydroxyalkyl disiloxane. The method includes the following steps: (1) mixing carboxylic acid unsaturated ester with dimethylchlorosilane in an organic solvent, introducing inert gas, adding hydrosilyation catalyst and stirring for 2 to 12 hours; (2) dropwising a mixed liquid of acidic aqueous solution and the organic solvent to the hydrosilylation reaction product and hydrolyzing for 1 to 6 hours; (3) regulating the hydrolysis product pH to be neutral, extracting organic layers three times with extraction agent, washing three times, drying for 24 hours and removing the extraction agent by rotary evaporating to obtain the finished product. The method has the advantages of simple operation, simple steps, mild reaction conditions, pure product and high yield, and the yield of the hydrosilylation reaction product can reach 83.2% and the yield of the hydrolysis product can reach 89.5%.
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Description

technical field

[0001] The invention relates to a method for preparing hydroxyhydrocarbyl disiloxane, which belongs to the technical field of synthesis of organic silicon compounds. Background technique

[0002] Hydroxyhydrocarbyl-terminated polysiloxane oligomer is one of the main raw materials for the preparation of silicone block polymers, which has very important value. When synthesizing hydroxyhydrocarbyl-terminated polysiloxane oligomer, hydroxyhydrocarbyl disiloxane is a necessary raw material.

[0003] At present, the existing domestic methods for preparing hydroxyalkyl disiloxanes are mainly hydrosilylation and organometallic synthesis. Chai Zibin, Wu Qingzhou, etc. used tetraethoxysilane and allyl alcohol as raw materials, carried out transesterification under the catalysis of sodium ethoxide, and obtained the monobasic transesterification product allyloxytriethoxysilane by controlling the conditions, and then It reacts with 1,1,3,3-tetramethyldisiloxane under th...

Claims

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