Method for preparing mercaptoalkyl alkoxy silane

Abstract

The invention discloses a preparation method for hydrosulfuryl alkyl alkoxy silane. The method has lower cost and is suitable for the large-scale industrialized production. The method comprises the following steps: 1 adding sodium alcoholate into an autoclave under the protection of inert gas; 2 then introducing hydrogen sulfide into the autoclave, controlling the temperature at 10 to 70 DEG C, and controlling the pressure in the autoclave at 0.01 to 2MPa; 3 then dropping chloride alkyl alkoxy silane into the autoclave, controlling the temperature at 10 to 150 DEG C, and controlling the pressure in the autoclave at 0.01 to 2MPa; and 4 then filtering the reactants, collecting the filtrate and carrying out vacuum distillation; and collecting the distillation to obtain the object of hydrosulfuryl alkyl alkoxy silane. The method has the advantages of simple process and environmental pollution reduction, together with the product yield above 90 percent, and the product purity above 98 percent.

Description

technical field [0001] The invention relates to a preparation method of mercaptoalkylalkoxysilane. Background technique [0002] Mercaptoalkylalkoxysilanes are mainly used in polymer modification—such as radial tires, light-curing resins, dyeing and finishing auxiliaries, etc., and there are many applications. Therefore, there are many studies on the synthesis of mercaptoalkylalkoxysilanes. [0003] A preparation method is disclosed in the patent document of Chinese Patent Publication No. CN1746175, which is characterized in that: using chloroalkyl alkoxysilane and thiourea as raw materials, in the presence of a catalyst in a certain proportion, with alcohol as a solvent, after adding Under pressure conditions, react at a certain temperature to generate a mixture of mercaptoalkylalkoxysilanes, statically separate the salts, and supernatant decompression distillation target substance mercaptoalkylalkoxysilanes; the disadvantage of the above method is that by-product organic ...

AI Technical Summary

Problems solved by technology

[0003] A preparation method is disclosed in the patent document of Chinese Patent Publication No. CN1746175, which is characterized in that: using chloroalkyl alkoxysilane and thiourea as raw materials, in the presence of a catalyst in a certain proportion, with alcohol as a solvent, after adding Under pressure conditions, react at a certain temperature to generate a mixture of mercaptoalkylalkoxysilanes, statically separate the salts, and supernatant decompression distillation target substance mercaptoalkylalkoxysilanes; the disadvantage of the above method is that by-product organic Salt is soluble in the product, it is difficult to remove even if distilled, and the product is easy to mix

The disadvantage of the above method is that the process is long and the operation is relatively cumbersome