DQS-1催化剂的丙烯聚合性能研究  

The propylene polymerization with the DQS-1 catalyst

作　　者：张纪贵[1] 夏先知[1] 刘月祥[1] 张天一[1] 高富堂[1] 齐琳[1] 

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油化工》2017年第2期190-195,共6页Petrochemical Technology

基　　金：中国石化资助项目(410018)

摘　　要：以环己基甲基二甲氧基硅烷(CHMMS)、二环戊基二甲氧基硅烷(DCPMS)、二异丁基二甲氧基硅烷(DIBMS)和二异丙基二甲氧基硅烷(DIPMS)为外给电子体,考察了DQS-1催化剂在不同铝硅比和不同加氢量条件下的丙烯聚合性能及聚合活性衰减速率,着重探索了DQS-1/CHMMS催化体系聚合温度对丙烯本体聚合的影响及乙丙抗冲共聚能力。实验结果表明,以CHMMS或DIPMS为外给电子体时,DQS-1催化剂同时兼具高的立构定向性和好的氢调敏感性,且丙烯聚合活性衰减速率明显低于现有DQC催化剂;提高聚合温度,可提高DQS-1催化剂的聚合活性及聚丙烯树脂的等规度,但其熔体流动指数不降低;用于乙丙抗冲共聚时,DQS-1催化剂的乙丙共聚能力相比DQC-602催化剂提高约30%。Propylene polymerization was carried out with the DQS-1 catalyst as the main catalyst, four different organic compounds, namely cyclohexyl methyl dimethoxy silane（CHMMS）, dicyclopentyl dimethoxy silane（DCPMS）, diisobutyl dimethoxy silane（DIBMS） and diisopropyl dimethoxy silane（DIPMS）） as the external electron donors. The influences of molar ratio of Al to Si, hydrogen content and polymerization time on the performances of the DQS-1 catalyst in the propylene polymerization were investigated, specially, the propylene bulk polymerization at different polymerization temperature and the ethylene-propylene copolymerization with the DQS-1/CHMMS catalyst system for impact copolymer were studied. The results indicated that, the DQS-1 catalyst had high stereospeciflcity and good hydrogen response at the same time when CHMMS or DIPMS was used as the external electron donor, its activity decay rate was significantly lower than that of the DQC catalyst; with the polymerization temperature rise, both the activity of the DQS-1 catalyst and the isotacticity of the polypropylene products increased, the polypropylene products still had high melt index. It was showed that the performances of the DQS-1 catalyst were higher in the ethylene- propylene copolymerization than those of the DQC-602 catalyst, with 30% higher both ethylene content and rubber phase content in the products.

关 键 词：DQS-1催化剂 丙烯聚合 活性衰减 抗冲乙丙共聚物 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]