Method capable of increasing content and yield of gamma-chloropropyltriethoxysilane simultaneously

Abstract

The invention discloses a method capable of increasing the content and yield of gamma-chloropropyltriethoxysilane simultaneously, and the method comprises the following steps: adopting gamma-chloropropyltrichlorosilane prepared by the reaction of trichlorosilane and chloropropene to react with ethanol and finally obtaining gamma-chloropropyltriethoxysilane though esterification, neutralization and distillation. The invention adds lithium chloride, 4-methylaminopyridine and fatty alkyl dimethyl tertiary amine as esterifying catalyst in esterification reaction for the synergetic catalysis to the reaction between gamma-chloropropyltrichlorosilane and ethanol so as to increase the product content, greatly increase the conversion rate of gamma-chloropropyltrichlorosilane, increase the product yield, inhibit the side effect, shorten the reaction time, reduce the impurity content of the product and reduce the Cl<-> content in the product of which target value is not more than 50ppm.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method for simultaneously increasing the content and yield of γ-chloropropyltriethoxysilane. Background technique [0002] Due to its unique good performance, silane coupling agent can form a firm bond between inorganic materials and organic materials, enhance the mechanical properties, electrical properties, water resistance, etc. of materials, and is widely used in glass fiber and radial tires. The use of silane coupling agents in glass fibers accounts for about 50% of the total domestic consumption of silane coupling agents; the second is radial tires, accounting for more than 40%, and the rest is used in consumer fields such as coatings. With the development of glass fiber industry and radial tire industry, it is expected that during the Eleventh Five-Year Plan period, the demand for silane coupling agents in my country will maintain a growth rate of more than 10%. With t...

AI Technical Summary

Problems solved by technology

Secondly, the direct method that has just entered trial production uses silicon powder and ethanol as the main raw materials to first synthesize triethoxysilane and then react with chloropropene to synthesize γ-chloropropyltriethoxysilane; the existing production processes mainly include the following Disadvantages: (1) The finished product content is low, generally at 98.5%, rarely more than 99%, and the product above 99.5% is even less; (2) The impurity content is high, and the free chlorine content in the product is high, which is used in the production of special catalyst carriers , aerospace materials, preparation of ionic liquid catalysts, and production of special-purpose rubber products are more restricted

Although the direct method has the advantages of shortening the synthesis steps, reducing production costs, not releasing hydrogen chloride, avoiding environmental pollution, and improving product quality, it still has the following disadvantages: 1. The quality requirements for raw materials, especially silicon powder, are extremely strict, including content, particle size, Iron medium content and other indicators; ②High requirements for process control and automation level, difficult unit operation technology; ③Large investment in production equipment; ④High technical difficulty