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Method for preparing alkylalkoxysilanes

A technology of alkyl alkoxy silane and alkyl ether, which is applied in the field of preparing alkyl alkoxy silane and can solve problems such as poor running ability and the like

Active Publication Date: 2021-03-19
DOW SILICONES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, methods employing halosilanes or hydrogen halides may have the disadvantage of being less runnable on a commercial scale
Also, the method using alkyl halides has the disadvantage of preparing alkylhaloalkoxysilanes without complete reaction with alkylalkoxysilanes

Method used

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  • Method for preparing alkylalkoxysilanes

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Embodiment

[0040] These examples are intended to illustrate some embodiments of the invention and should not be construed as limiting the scope of the invention described in the claims. Formula Cu with a purity of 99.5% 5 Copper silicide of Si was purchased from Alfa Aesar. Cu with a purity of 97% 5 Si was purchased from Gelest.

[0041] Reference Example 1-Copper Silicide Preparation

[0042] Copper silicide ingots were prepared by high temperature melting of precursor materials using a laboratory arc melter model MRF SA200. The general formula is M 5 Si, where M is pure Cu or a mixture of copper and another metal other than copper in a 99:1 atomic ratio of copper to other metal. Appropriate weights of precursor materials were mixed together and placed in an oxygen-free copper crucible. The silicide formation process was performed in three one-minute periods under an argon (Ar) atmosphere (80kPa-90kPa) using a standard tungsten ceride electrode. Between time periods, the sample...

no. 1 approach

[0051] In a first embodiment, a method comprises:

[0052] 1) Heating the ingredients at a temperature of 150°C to 400°C, said ingredients including:

[0053] a) alkyl ethers and carbon dioxide, and

[0054] b) silicon source and catalyst;

[0055] Thus forming the inclusion formula R (4-a) Si(OR) a wherein each R is independently an alkyl group and subscript a is 1 to 4. In this embodiment, the ingredients may be free of halogenated compounds and / or the method may be performed in the absence of halogenated compounds.

[0056] In a second embodiment, the method according to the first embodiment is carried out, wherein the hydrocarbyl ether is selected from dimethyl ether, diethyl ether or methylphenyl ether.

[0057] In a third embodiment, the method according to the first embodiment is performed, wherein the catalyst comprises copper.

[0058] In a fourth embodiment, the method according to the first embodiment is carried out, wherein component b) is a copper silicide. ...

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Abstract

A method is useful for preparing alkylalkoxysilanes, such as alkylalkoxysilanes, particularly dimethyldimethoxysilane. The method includes heating at a temperature of 150 DEG C to 400 DEG C, ingredients including an alkyl ether and carbon dioxide, and a source of silicon and catalyst. The carbon dioxide eliminates the need to add halogenated compounds during the method.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(e), this application claims the benefit of U.S. Provisional Patent Application Serial No. 62 / 728090, filed September 7, 2018. US Provisional Patent Application Serial No. 62 / 728090 is hereby incorporated by reference. technical field [0003] Alkylalkoxysilanes can be prepared by direct synthesis by contacting an alkyl ether and carbon dioxide with a catalytic source of silicon. This method avoids the need to use halogenated compounds in the preparation of the alkylalkoxysilanes. Background technique [0004] Alkylalkoxysilanes (e.g., dimethyldimethoxysilane, methyltrimethoxysilane, and trimethylmethoxysilane) are used in the silicone industry to prepare a variety of silicone fluids and resins intermediate. Alkylalkoxysilanes are commercially produced by alkoxylation of alkylhalosilanes. When an alkylhalosilane is reacted with an alcohol, the resulting alkoxylation reaction produces an al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18C01G3/00C07F7/08B01J35/00
CPCC07F7/0801C07F7/1876C07F7/188C01B33/06B01J21/06B01J37/0036B01J37/08C07F7/0834B01J35/40
Inventor J·罗伯茨V·普什卡廖夫D·凯瑟里斯
Owner DOW SILICONES CORP