粗2-巯基苯并噻唑合成促进剂N-环己基-2-苯并噻唑次磺酰胺的研究

研究了次氯酸钠氧化粗2-巯基苯并噻唑(M)合成橡胶硫化促进剂 N-环己基-2-苯并噻唑次磺酰胺(CBS)的工艺。确定的最佳工艺条件为:n(环己胺):n(M)=2.5:1.0,n(硫酸):n(NaOH)=0.4:1,反应温度45℃,NaClO 滴加时间1.5 h。中型试验结果表明:CBS 收率约94%,其质量指标达到了 HG 2096—91标准中一级品的标准。该新工艺取消了粗 M 的精制工序,大幅减少了废水排放,降低了生产成本。

SYNTHESIS OF RUBBER VULCANIZATION ACCELERATOR N-CYCLOHEXYL-2-BENZOTHIAZOLESULPHENAMIDE WITH CRUDE 2-MERCAPTOBENTHIAZOLE

Rubber vulcanization accelerator N-Cyclohexyl-2-benzothiazolesulphenamide(CBS)was prepared with crude 2-mereaptobenthiazole(M)and cyclohexylamine with sodium hypochlorite as oxi- dant.The optimum reaction conditions were found as follows:n(cyclohexylamine):n(M)=2.5:1, n(sulfurie acid):n(sodium hydroxide in NaClO)=0.4:1,reaction temperature 45℃,and reaction time 1.5 h.The results of pilot test demonstrated that the yield of CBS was about 940% and the quali- ty of CBS was first grader,analyzed according to the HG 2096-91 criterion.The new process avoids the refining procedure of crude M,and decreased the amount of waste water and the cost of product.