环氧化端羟基聚丁二烯/甲苯二异氰酸酯型聚氨酯的合成  

Synthesis of epoxidized hydroxyl-terminated polybutadiene/tolylene diisocyanate polyurethane

作　　者：孙捷[1] 郑元锁[1] 高国新[1] 王蕾[1] 谭溢波[1] 

机构地区：[1]西安交通大学理学院,陕西西安710049

出　　处：《合成橡胶工业》2008年第6期428-431,共4页China Synthetic Rubber Industry

摘　　要：用环氧化端羟基聚丁二烯(EHTPB)与甲苯二异氰酸酯(TDI)合成了聚氨酯,考察了反应时间、TDI用量、环氧值以及扩链剂1,4-丁二醇(BDO)用量对聚氨酯拉伸性能的影响,通过差示扫描量热法(DSC)分析确定了反应温度,并研究了反应的表观活化能(Ea)和反应级数(n)。结果表明,在反应温度为70℃、时间为7d、—NCO/—OH(摩尔比)为1.4、环氧值为0.0018mol/g左右时,聚氨酯的拉伸性能较好;适当加入扩链剂BDO可以同时提高聚氨酯的拉伸强度和扯断伸长率,BDO与EHTPB中—OH的最佳摩尔比为1.0;EHTPB与TDI反应的Ea为59.44kJ/mol,n为1.02,70℃下的反应速率常数为1.2×10-2s-1。The polyurethane(PU)were prepared by epoxidized hydroxyl-terminated polybutadiene(EHTPB)and tolylene diisocyanate(TDI).The effects of reaction time,amount of TDI,epoxidized value and amount of chain extender 1,4-butanediol(BDO)on tensile properties of PU were investigated.The reaction temperature and kinetic parameter were also studied by differential scanning calorimetry.The results showed that when the preparation conditions were —NCO/—OH(mole ratio)1.4,epoxidized value 0.001 8mol/g,at 70 ℃ for 7 d,the te...

关 键 词：环氧化端羟基聚丁二烯 甲苯二异氰酸酯 聚氨酯 拉伸性能 差示扫描量热法 反应动力学 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]