Preparation method of methyl trichloro silicane-dimethyldichlorosilane-trimethyl chlorosilane (MDT)

A branched-chain silicone oil, purpose technology, applied in the field of preparation of branched-chain silicone oil, can solve the problems of low yield, large gel, complex preparation process, etc., and achieve the effects of improving yield, avoiding gel, and improving viscosity

Active Publication Date: 2012-01-25
黄浩
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AI Technical Summary

Problems solved by technology

[0004] The preparation of branched chain silicone oil (MDT) in the prior art mainly has the following problems: 1, due to the introduction of T groups, it is easy to produce a large amount of gel during hydrolysis; 2, the preparation of high viscosity branched chain silicone oil (MDT) requires low Viscosity branched chain silicone oil (MDT) is added with DMC or silicone oil telomerization to increase the viscosity of branched chain silicone oil, the yield is low, and because of the need to add DMC or silicone oil telomerization, the preparation process is complicated and the preparation cost is also increased

Method used

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Embodiment Construction

[0008] A kind of preparation method of branched chain silicone oil (MDT), comprises the steps:

[0009] (1) Mixture of alcohol and water

[0010] Put 100 parts of methylchlorosilane mixture into the reaction kettle, the methylchlorosilane mixture is: containing ≡Si-CI, =Si-CI 2 、-Si-CI 3 mixture. Add a mixture of methanol and water dropwise to the kettle under stirring conditions, including 40-55 parts of methanol and 10-30 parts of water, and the dropwise addition is completed in 30-40 minutes. The temperature is controlled within 40°C. The hydrogen chloride gas produced by the reaction is vacuum Pump it into the hydrochloric acid recovery kettle to recover hydrochloric acid.

[0011] In the present invention, the mixture of alcohol and water is added dropwise to the mixture of methylchlorosilane to prepare low-viscosity alkoxy silicone oil, so as to remove the chlorine on the molecule; the mixture of alcohol and water is used to mix the mixture of methylchlorosilane The ...

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Abstract

The invention discloses a preparation method of methyl trichloro silicane-dimethyldichlorosilane-trimethyl chlorosilane (MDT). The method comprises the following steps of: hydrolyzing a chlorsilane mixture with alcohol to prepare low-viscosity alkoxyl silicon oil; hydrolyzing and neutralizing low-viscosity alkoxyl silicon oil; and removing low-boiling-point substances to obtain low-viscosity and high-viscosity MDT. By adopting the method, gelation of a T group is avoided, the yield is increased, and the viscosity of the MDT is increased by adding DMC (Dimethyl Carbonate) or silicon oil for telomerization.

Description

technical field [0001] The invention relates to a preparation method of branched chain silicone oil (MDT). Background technique [0002] At present, branched chain silicone oil (MDT) is mainly based on monomethyltrichlorosilane, dimethyldichlorosilane, and trimethylchlorosilane after hydrolysis, neutralization, and addition of dimethylcyclosiloxane mixture (DMC for short) or silicone oil , under the action of a catalyst, the telomerization is prepared in several steps. [0003] Since the T group is introduced into the branched silicone oil molecule, the T group is easy to gel in large quantities during hydrolysis. At present, branched-chain silicone oil (MDT) can only be made with low viscosity, and high-viscosity branched-chain silicone oil (MDT) can only be obtained by re-polymerization of low-viscosity branched-chain silicone oil (MDT) and DMC or silicone oil under the action of a catalyst. [0004] The preparation of branched chain silicone oil (MDT) in the prior art m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38C08G77/18
Inventor 黄浩
Owner 黄浩
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