Preparation method of bis [propyl triethoxysilane] disulfide

Abstract

The invention aims at providing a method for synthesizing bis [propyl triethoxysilane] disulfide under an aqueous phase condition free from a buffer. The method comprises the steps of A. carrying out reaction on a sodium polysulfide aqueous solution and chloropropyl triethoxysilane under an aqueous phase condition in presence of a phase transfer catalyst and a water-insoluble organic solvent to generate a reaction mixture; and B. separating bis [propyl triethoxysilane] disulfide from the reaction mixture, wherein the way of separating the product bis [propyl triethoxysilane] disulfide from the reaction mixture in the step B comprises the steps of a. separating an organic phase: separating an organic phase from the upper layer of the reaction mixture obtained from the step A, wherein the lower layer of the reaction mixture is an aqueous phase; and b. purifying the organic phase: distilling and purifying the organic phase to obtain the product bis [propyl triethoxysilane] disulfide. The method disclosed by the invention can improve yield, reduce generation of three wastes and relieve environmental protection pressure.

Description

technical field [0001] The invention relates to a production method of bis[propyltriethoxysilane] disulfide, which belongs to the synthesis of organic chemicals. More specifically, a method for producing bis[propyltriethoxysilane] disulfide under aqueous phase conditions without the use of a buffer. Background technique [0002] Bis[propyltriethoxysilane] disulfide is an important auxiliary agent for the production of green tires. It is widely used in the products of sulfur vulcanized rubber system. Through the coupling of inorganic filler or fiber and rubber matrix, it can achieve Improvement of product performance. Used in tires, especially to improve the friction resistance, rolling resistance and wet skid resistance of tires. [0003] At present, there are generally two large-scale industrial production methods of bis[propyltriethoxysilane] disulfide. The first one is the synthesis method of organic solvent technology such as using alcohol solvent, hydrogen sulfide, al...

AI Technical Summary

Problems solved by technology

[0003] At present, there are generally two large-scale industrial production methods of bis[propyltriethoxysilane] disulfide. The first one is the synthesis method of organic solvent technology such as using alcohol solvent, hydrogen sulfide, alkali metal alcoholate, etc. as raw materials. , this method has the problems of flammable, explosive, toxic and harmful substances as raw materials, unsafe production, high cost of raw materials, difficult to handle by-products, exhaust emissions and other problems; the second is the phase transfer catalytic aqueous phase using a buffer method, such as the production method using alkali metal sulfide or hydrogen sulfide or hydroxide, water, buffering agent, etc. as raw materials, a buffering agent must be added in the production method, and the buffering agent is required for useless substances in subsequent production It is treated as the three wastes, which undoubtedly increases the input of raw materials and the output of the three wastes

[0004] In addition, the inventor's literature search and practical operation prove that there is no successful case of synthesizing bis[propyltriethoxysilane] disulfide in the phase-transfer catalytic aqueous phase method without buffer