分子蒸馏技术在PPO-PTHF-PPO共聚醚提纯中的应用  

Application of Molecular Distillation Technology in Purifying of PPO-PTHF-PPO Copolyether

作　　者：汪存东[1,2] 张丽华[1] 罗运军[2] 夏敏[2] 

机构地区：[1]中北大学化工学院,山西太原030051 [2]北京理工大学材料学院,北京100081

出　　处：《高分子材料科学与工程》2013年第1期107-110,共4页Polymer Materials Science & Engineering

基　　金：总装备部预研基金项目资助(40406030101-5)

摘　　要：以大分子聚四氢呋喃二醇低聚物为起始剂制备聚环氧丙烷聚四氢呋喃共聚醚(PPO-PTHF-PPO)的产物中会残留一些未参加反应的聚四氢呋喃低聚物,这些低聚物很难用一般的提纯方法除去。文中根据分子蒸馏技术的特点,应用刮膜式分子蒸馏装置对PPO-PTHF-PPO共聚醚进行了提纯研究。考察了加热温度、提纯次数等条件对共聚醚的提纯效果的影响。结果发现在真空度为0.1 Pa,转速为200r/min,加热温度为180℃,经过两次分子蒸馏后可以有效除去共聚醚中的低聚物和小分子,提纯后的共聚醚纯度可以达到99.95%,分子量分布降低到1.57,并且提纯后的共聚醚不用干燥可直接用于聚氨酯的生产。The polypropylene oxide-polytetrahydrofuran-polypropylene oxide （PPO-PTHF-PPO） copolyether was synthesized with polytetrahydrofuran glycol （PTMG） as the macroinitiator. The remnants of polytetrahydrofuran are difficult to separate by the general purification methods. According to the characteristics of molecular distillation, PPO-PTHF-PPO copolyether was purified by the molecular distillation technology. The results show that molecular distillation can effectively remove the oligomer and small molecules in the copolyether. The operation parameters include： vacuum degree of 0.1 Pa, rotating at 200 r/min, heating temperature of 180 ℃ and two operations. The purity of copolyether increases to 99.95 % after purification, the molecular weight distribution reduces to 1.57. It could be applied directly to the polyurethane production without drying.

关 键 词：分子蒸馏 共聚醚 提纯 低聚物 

分 类 号：TQ630.6[化学工程—精细化工]