Vulcanizing accelerator MBT and preparation method thereof

Abstract

The invention belongs to the field of rubber aids, and particularly relates to a vulcanizing accelerator MBT and a preparation method thereof. The preparation method adopts phenylamine, sulfur and carbon disulfide as raw materials to prepare the vulcanizing accelerator MBT under the action of a catalyst and under the conditions of 150 to 240 DEG C and 5 to 15 MPa. The preparation method comprisesthe following steps: mixing raw materials sulfur and carbon disulfide, stirring, preparing a carbon disulfide solution of sulfur, controlling a mass ratio of sulfur to carbon disulfide at 1: (0.7 to 4.8); and then pumping the raw material phenylamine and the prepared carbon disulfide solution of sulfur into a reactor according to a mass ratio of 1: (1.0 to 6.0), and controlling a feeding air rateat 0.08 to 3h<-1>. By adopting the non-homogenous catalyst, the synthetic condition of the MBT can be milder, and the product yield is increased compared with a catalyst-free direct synthesis method and is basically equivalent to the catalytic effect using organic strong acid such as salicylic acid.

Description

Technical field [0001] The invention belongs to the field of rubber additives, and specifically relates to a vulcanization accelerator MBT and a preparation method thereof. Background technique [0002] In the 1920s, BedFord CW et al. discovered that MBT (2-mercaptobenzothiazole) can be used as a vulcanization accelerator in rubber processing, namely accelerator MBT, which is a milestone in the history of accelerator development. The accelerator MBT is not only an important vulcanization accelerator in the rubber industry, but also the parent material of most sulfenamide accelerators, and an indispensable intermediate for the production of thiazole vulcanization accelerators. After further synthesis and processing, it can produce accelerators DM, CBS, DCBS, TBBS and other accelerators, whose output occupies the first place among various rubber additives, are the "leading products" in the vulcanization accelerator industry. In addition, the promoter MBT can also be used as a mine...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the main problems currently plaguing MBT production enterprises are mainly centered on the following three points: First, batch reactors are used for batch production, which requires high equipment investment under high temperature and high pressure conditions, difficulty in industrialization, and high safety risks in the production process; The 2nd, there are too many by-products in the MBT synthetic process, and the product yield is on the low side (industrialization average yield is only about 90%), and though adopting catalyzer can improve yield, catalyzer can't reclaim, and also can produce certain to the quality of product The third is that the product requires a refining process, and the waste liquid or waste resin obtained from the refining process is difficult to handle, which greatly increases the cost of the enterprise and the environmental risk