Industrial synthesis method for acetoxylpropyltrimethoxysilane

Abstract

The invention relates to an industrial synthesis method for acetoxylpropyltrimethoxysilane, which belongs to the technical field of fine chemical engineering. According to the industrial synthesis method, trichlorosilane and allyl acetate first undergo hydrosilylation under catalyst, so that acetoxylpropyltrichlorosilane is obtained, and methanol is then used for esterifying acetoxylpropyltrichlorosilane so that acetoxylpropyltrimethoxysilane and hydrochloric acid are obtained. The yield of acetoxylpropyltrimethoxysilane disclosed by the invention is high, the synthesis process is simple and safe, and the environment is not polluted.

Description

technical field [0001] The invention relates to an industrial synthesis method of acetoxypropyltrimethoxysilane, which belongs to the technical field of fine chemicals. Background technique [0002] Acetoxypropyltrimethoxysilane is a widely used silane coupling agent product. Its molecular structure contains an acetoxy functional group with an unsaturated double bond structure and three hydrolyzable methoxy functional groups. Its dual reactivity allows them to improve the degree of bonding, bonding and compatibility between the two through two-way chemical reactions with inorganic materials such as glass, metals, fillers, and organic polymers such as thermosetting resins, plastics, and elastomers. Then improve the mechanical properties of the resin-based composite material or improve the adhesive strength and water resistance of the resin coating. At the same time, acetoxypropyltrimethoxysilane can also be copolymerized with monomers such as acrylic acid, methacrylic acid, ...

AI Technical Summary

Problems solved by technology

[0011] The first three-step method is the most commonly used method in industry at present, and the process is very mature, but there are two problems: one is that there are many by-products in the step of obtaining chloropropyl trichlorosilane by addition of chloropropene and trichlorosilane , resulting in a low yield of the target addition product and an increase in production cost

The second is that when chloropropyltrimethoxysilane reacts with anhydrous sodium acetate, a large amount of by-product sodium chloride solid will be generated. There are 263 kilograms of sodium chloride salt in theory per ton of product, which contains a small amount of acetyl Oxypropyltrimethoxysilane is difficult to clean and cause environmental pollution

[0012] The second method is the simplest method, but the process is immature, and there are some problems as follows: First, the raw material trimethoxysilane is prone to self-disproportionation reaction during production, transportation, storage and use, and emits flammable and explosive The dangerous gas hydrogen has a great potential safety hazard. There have been safety accidents of trimethoxysilane flash explosion in many domestic manufacturers who produce and use trimethoxysilane

Moreover, trimethoxysilane vapor is extremely irritating to human eyes, making eyes red and swollen or even blind

Second, the quality of the raw material trimethoxysilane is unstable

The metal copper catalyst may remain in the trimethoxysilane synthesized by the direct method, and hydrogen chloride may remain in the trimethoxysilane synthesized by the esterification method. These two substances will poison the platinum catalyst and make the production unstable; the third is the addition of by-products Many, the yield is not high; the fourth is the need to use solvents, the consumption and treatment of solvents, increase production costs and reduce production capacity