摘要
采用金属钙、脱水液氨、载体纳米二氧化硅及改性剂乙腈与环氧丙烷制备出氨钙体系催化剂.在催化剂质量(以金属钙计)为单体氧化乙烯质量的1%,聚合温度为30℃,聚合时间为4 h的条件下,用氧化乙烯的静置聚合评价了所制备催化剂的性能.结果表明,当乙腈与金属钙的摩尔比为0.3～0.5,环氧丙烷与金属钙的摩尔比为0.6～1.0时,催化聚合得到黏均相对分子质量为(60～90)×104的聚氧化乙烯,且产物收率高于80%.
Calcium ammine catalyst was prepared with metal calcium,dehydrated liquid ammonia as raw materials,nano-silica as a carrier and acetonitrile and propylene epoxide as modifiers.The properties of the catalyst were evaluated by using static polymerization of ethylene epoxide under the conditions of mass ratio of catalyst to monomer ethylene epoxide 1%,reaction time 4 h and temperature 30℃.The results showed that poly(ethylene oxide) was synthesized with viscosity-average relative molecular weight mass (60-90)×104 and yield of more than 80%,when the molar ratio of acetonitrile to calcium was 0.3-0.5 and propylene epoxide to calcium 0.6-1.0.
出处
《石化技术与应用》
CAS
2007年第5期409-411,共3页
Petrochemical Technology & Application
关键词
聚氧化乙烯
氧化乙烯
液氨
纳米二氧化硅
环氧丙烷
poly(ethylene oxide)
ethylene epoxide
liquid ammonia
nano-silica
propylene epoxide
