氯丁橡胶(CR)分子主链的双键碳原子上连接有极性氯原子,抑制了双键活性和反应能力,导致CR硫化活性降低,硫化相对困难.采用溶液法,以三溴化硼为溴化剂,引入键能较低的碳溴键,溴化改性氯丁橡胶,提高橡胶的硫化活性.结果表明,CR分子链中α-H被溴取代,其门尼粘度ML(1+4)值较溴化前提高了3.06％,焦烧时间较溴化前缩短了57％,正硫化时间缩短了8.8％,经BBr3改性后的氯丁橡胶,其硫化速度加快.
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