丁腈橡胶臭氧化制备羧基丁腈橡胶

Preparation of carboxylated acrylonitrile-butadiene rubber by ozonization of acrylonitrile-butadiene rubber

以臭氧氧化丁腈橡胶合成了羧基丁腈橡胶,研究了反应时间、反应温度、臭氧通入量及丁腈橡胶胶液质量浓度对产物特性黏数和酸值的影响。结果表明,以丁腈橡胶臭氧化制备羧基丁腈橡胶,在实验范围内,反应温度升高、增大臭氧通入量和降低丁腈橡胶胶液质量浓度可以提高羧基丁腈橡胶的羧基含量,降低丁腈橡胶的相对分子质量。但是反应时间的影响较为复杂,开始时丁腈橡胶相对分子质量降低很快,到达某个时刻后保持不变。反应时间对羧基丁腈橡胶的酸值没有影响。

Carboxylated acrylnitrile-butadiene rubber（CNBR） was prepared via ozonization of acrylonitrile-butadiene rubber（NBR） in butyl acetate.Effects of reaction time,reaction temperature,the ozone flow rate and NBR concentration on intrinsic viscosity and acid value of CNBR were investigated.The results showed that higher reaction temperature,higher ozone flow rate and lower concentration of NBR could obviously increase the content of carboxylic group in CNBR and shorten the chain length of NBR.However,the factor of reaction time had a different performance.At the beginning,the intrinsic viscosity of CNBR rapidly dropped,but kept unchanged from some moment.And there was no influence of reaction time on acid value of CNBR.