以正己烷(n-Hex)为溶剂或n-Hex/一氯甲烷(CH3Cl)混合物为溶剂体系、氯化氢/氯化乙基铝/二氯二氰基苯醌为引发体系,采用正离子溶液聚合法对异丁烯(IB)与对甲基苯乙烯(p-Me St)在-90^-20℃下进行无规共聚,考察了n-Hex/CH3Cl(体积比)、二氯乙基铝(Et Al Cl2)/一氯二乙基铝(Et2Al Cl)(摩尔比)及反应温度对共聚反应转化率和共聚物相对分子质量的影响。结果表明,随着n-Hex/CH3Cl混合溶剂体系中n-Hex体积分数的增加,共聚反应转化率和共聚物的相对分子质量均下降;在Et Al Cl2/Et2Al Cl共引发体系中,随着Et2Al Cl摩尔比的增加,共聚物的相对分子质量不断增大;随着聚合反应温度的升高,共聚反应转化率和共聚物的相对分子质量均下降。
A novel rotating packed bed(RPB)technology was used to prepare butyl rubber for the first time.The effects of the operating parameters,such as rotate speed,polymerization temperature,on the molecular weight and molecular weight distribution of isobutylene-isoprene rubber(IIR)were investigated in the experiment.The results revealed that IIR prepared by the unique high gravity reaction technology with the molecular weight of 2.89×105,molecular weight distribution index of 1.99 and single-pass conversion 30% was obtained at N=1200 r·min-1,Tp=-100℃ in the experimental condition.In addition,the mean residence time of the products was less than 1s while that of the conventional technology was 30—60 min.The production efficiency per unit volume of the equipment was increased by 2—3 orders of magnitude.With increasing N and decreasing Tp,the molecular weight of IIR increased whereas no obvious difference of the distribution index of molecular weight was observed.
