Continuous production method for vulcanization accelerator DCBS

Abstract

The invention provides a continuous production method for vulcanization accelerator DCBS. The continuous production method includes the steps that an MBT alkali solution, a dicyclohexylamine acid solution, solvent and oxidizing agent are subjected to an oxidizing reaction in a continuous flow reactor, then reacted materials are after-treated, and the vulcanization accelerator DCBS is obtained. According to the method, the MBT conversion percent is high, and the purity of the product is high; the continuous production method has the advantages of being high in reaction speed, high in product yield, low in wastewater COD (reacted wastewater is subjected to atmospheric distillation, residual solvent is recycled, and then the COD in residual water can be reduced to be 8,000 ppm or below), capable of facilitating treatment and the like, and is a new technology having the higher industry value.

Description

technical field [0001] The invention belongs to the field of rubber additives and relates to a continuous production method of a vulcanization accelerator DCBS. Background technique [0002] In the process of using rubber to produce various rubber products such as tires, hoses and rubber shoes, five types of additives must be used, which are rubber vulcanization accelerators (referred to as accelerators), rubber antioxidants, rubber vulcanization and vulcanization activators, processing Type rubber additives and special functional additives. [0003] The vulcanization accelerator is called accelerator for short. Substances that promote vulcanization. It can shorten the vulcanization time, lower the vulcanization temperature, reduce the amount of vulcanizing agent and improve the physical and mechanical properties of rubber. [0004] Accelerator DCBS (Chinese name N, N-dicyclohexyl-2-benzothiazole sulfenamide) is an aftereffect accelerator, which has good dispersion perfor...

AI Technical Summary

Problems solved by technology

Although this method provides a kind of continuous method for preparing rubber vulcanization accelerator CBS, this method does not have enlightenment effect to utilizing microchannel reactor to prepare DCBS, and reason is as follows: this method adopts excess cyclohexylamine as the solvent of product CBS, No solids are produced during the entire reaction process, and the reaction can proceed smoothly

However, dicyclohexylamine, the raw material of DCBS, cannot dissolve the product DCBS, and a large amount of solids will be produced during the synthesis process, which will block the pipeline and make the reaction impossible.

And the reaction residence time in the microchannel reactor is too long in this method, and the maximum flux of single reactor is only 15L / h, makes this technology do not possess industrialization capability at all, and reaction yield is relatively low (only in 87 %-95%), the purity of the reaction product cannot be guaranteed