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通过直接溴化溶液法丁基橡胶(IIR)胶液制备了溴化IIR(BIIR),对其结构及性能进行了表征,并与国外淤浆法产品进行了比较。结果表明,与国外淤浆法IIR相比,溶液法IIR的相对分子质量较大,分布较窄,异戊二烯单元含量较高。与几种国外淤浆法产品相比,溶液法IIR直接溴化制备的BIIR的溴质量分数为2.21%,溴代仲位烯丙基所占比例最高;BIIR的玻璃化转变温度最低,耐寒性较好;生胶的门尼黏度略高,门尼焦烧最长,加工安全性最好。
Brominated IIR (BIIR) was prepared by direct bromination of solutions of butyl rubber (IIR), and its structure and properties were characterized and compared with foreign slurry products. The results showed that the relative molecular mass of solution IIR was larger, the distribution was narrower and the content of isoprene units was higher than that of foreign IIR. Compared with several foreign slurry products, the bromine content of BIIR prepared by direct bromination of solution IIR is 2.21%, the highest proportion of brominated secondary allyl is the lowest. The glass transition temperature of BIIR is the lowest, and the cold resistance Better; raw plastic Mooney viscosity slightly higher, Mooney scorch the longest, the best processing safety.