Study on the preparation of rubber accelerator DCBS by ethanol solvent method
N,N-dicyclohexyl-2-benzothiazole sulfonamide(DCBS)was synthesized by using 2-mercaptobenzothiazole(accelerator M)and dicyclohexylamine as raw materials,ethanol as solvent,and sodium hypochlorite as oxidizer.The effects of ethanol mass fraction,raw material ratio,reaction temperature and reaction time on product quality and yield were explored.The optimal process conditions were confirmed as follows:n(M)∶n(dicyclohexylamine)∶n(sodium hypochlorite)=1.00∶0.83∶2.25,the mass concentration of sodium hypochlorite was 178 g/L,the reaction temperature was 55 ℃,and the reaction time was 2 h.The pilot test results showed that the product quality met the requirements of HG/T 4140-2010,and the yield was stabilized at more than 86％.
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