中低相对分子质量聚氧化乙烯合成用氨钙催化剂的研究

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

对环氧乙烷开环聚合制备聚氧化乙烯反应的氨钙催化剂进行研究。采用正交实验法，考察了m（氨）：m（钙）、m（乙腈）：m（钙）、m（环氧丙烷）：m（钙）、氨钙反应时间、改性剂反应时间等制备因素对聚氧化乙烯相对分子质量（简称分子量，下同）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。工业化实验结果表明，聚氧化乙烯产品聚合收率高于98％，产品黏均分子量在2×10^5～8×10^5可调。

An 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 m （ NH3 ） ：m （Ca）, m （ acetonitrile ） ：m （Ca）, m （ propylene oxide ） ： m （Ca）, reaction time of calcium with ammonia, and 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 performance with high polymerization yield（ 〉 98% ） and adjustable molecular weight of polyethylene oxide from 2 ×10^5 to 8 ×10^5.