Method for preparing high boiling silicone oil by using organic silicon high boiling substances

Abstract

The invention relates to a method for preparing high boiling silicone oil by using organic silicon high boiling substances, comprising hydrolyzation of alcohol and neutralization, wherein the organic silicon high boiling substances are hydrolyzed in the mixed liquid of alcohol and water and refluxed for 1-4 hours; nitrogen purging is carried out on the reactant, and then the reactant is added with hydrogen chloride dissolved in urea, zinc oxide and ammonium bicarbonate and in the system thereof. The invention integrally uses the organic silicon high boiling substances and lowers the chlorine content in silicon oil products, ensures the molecular weight and viscosity to be controllable and mass to be more stable; the usage of the neutralizing agent and latent solvent is reduced greatly, thus reducing the production cost; the process is simple and the industrial production is easy.

Description

technical field [0001] The invention relates to a method for preparing silicone oil, in particular to a method for producing high-boiling silicone oil from organosilicon high boilers. Background technique [0002] In recent years, with the rapid development of the organosilicon industry, the output of methyl chlorosilane monomer is increasing, which leads to the increasing output of by-product organosilicon high boilers. However, organosilicon high boilers cannot be made into useful organosiloxanes by simple methods due to their complex components, containing a large amount of silicon powder impurities, and easily releasing a large amount of corrosive hydrogen chloride gas when exposed to moisture. It has become a prominent problem encountered in the production of organic silicon monomers. [0003] At present, domestic and foreign researches on the conversion and utilization of organosilicon high boilers are mainly focused on the methods of cracking to produce chlorosilane ...

AI Technical Summary

Problems solved by technology

There are following deficiencies in the above method: (1) adopt methanol to react with high boiler at normal temperature, cause reaction time to be long and chlorine atom can not be replaced completely, chlorine content increases in the product, and product quality is not high; (2) adopt methanol and organic Silicon high boiler reaction also has problems such as high cost, low yield, and uncontrollable viscosity; (3) there is no corresponding strengthening measure to remove hydrogen chloride in the reaction system in the later stage of the reaction, so that the neutralizing agent and auxiliary in the subsequent neutralization step The amount of flux used is large, which increases the cost and causes the burden of environmental protection treatment