中低相对分子质量聚氧化乙烯合成用氨钙催化剂的研究

摘 要：对环氧乙烷开环聚合制备聚氧化乙烯反应的氨钙催化剂，采用正交设计的实验方法，考察了氨：钙质量比、乙腈:钙质量比、环氧丙烷:钙质量比、氨钙反应时间、改性剂反应时间等制备因素对聚氧化乙烯分子量和聚合收率的影响，得到乙腈和环氧乙烷添加量是主要影响因素，并优化得到可用于工业化应用的催化剂制备条件。工业化试验结果表明，聚氧化乙烯产品聚合收率高于98%，产品粘均相对分子量在20至80万间可调。

Synthesis of Calcium-ammonia Catalyst for Low-middle Molecular Weight Polyethylene Oxide

The orthogonal experimental research has been carried out on the calcium ammonia catalyst for the polymerization of ethylene oxide. The influences of catalyst synthesis parameters including the m(NH3):m(Ca), m(acetonitrile):m(Ca), m(propylene oxide):m(Ca), reaction time of calcium with ammonia, reaction time of modifier on the molecular weight of polyethylene oxide and polymerization yield were investigated. From the regression analysis, it was found that acetonitrile and propylene oxide were remarkable influence factors, and the industrialized preparation conditions of catalyst were determined. The industrial tests showed good catalytic performances with high polymerization yield (> 98%) and adjustable molecular weight of polyethylene oxide from 2×105 to 8×105.