环氧乙烷环氧丙烷无规聚醚短碳链起始端基结构控制

引发体系中的微量水分是影响环氧乙烷环氧丙烷无规聚醚起始端基结构 ,并进一步影响其分子量和使用性能的重要因素。研究了反应精馏方式、温度、物料配比等工艺条件对丁醇无规聚醚引发体系含湿量的影响 ,结果表明 :以甲苯或二甲苯为脱水剂的三元共沸反应精馏工艺在温度高于 1 1 5℃时的脱水效果较好 ,并用二元共沸反应精馏方法的对工艺进行了改进 ,在 m (丁醇 )∶ m (氢氧化钾 ) =1 1∶ 1时 ,效果较好 ,提出了适用于以低沸点醇类物质为起始剂的环氧乙烷环氧丙烷无规聚醚的起始端基结构控制方法。

INITATING TERMINAL GROUP STRUCTURE CONTROL OF RANDOM COPOLYMER OF ETHYLENE OXIDE AND PROPYLENE OXIDE

Trace water in the initiator system is an important factor which affects the initiating terminal group structure and the performance of the random copolymer of ethylene oxide and propylene oxide. The influence of process conditions including reaction rectification mode, temperature and material ratio on water content of the initiator system was studied. Good dehydration results were obtained by ternary azeotropic rectification with toluene or xylene as dehydrant. It is proved that binary rectification is another practical method and high dehydration yield was obtained when m(butanol)∶ m(KOH)= 11∶1.