有机金属催化剂对脂肪族聚氨酯树脂储存稳定性的影响  

Effects of Organo-metallic Catalysts on the Storage Stability of Aliphatic Polyurethane Resins

作　　者：龚涛[1] 张杰[1] 胡春圃[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《高分子学报》2014年第10期1369-1377,共9页Acta Polymerica Sinica

摘　　要：以聚己二酸乙二醇丁二醇酯(PBGA)为软段,异佛尔酮二异氰酸酯(IPDI)、1,4-丁二醇(BDO)和异佛尔酮二胺(IPDA)为硬段,分别采用辛酸亚锡、二月桂酸二丁基锡、MB 20、BiCAT Zn、乙酰丙酮锆、乙酰丙酮镍、新癸酸钕和新癸酸铈8种有机金属催化剂,合成弱溶剂体系的脂肪族聚氨酯树脂.采用FTIR和GPC研究了聚氨酯树脂的合成;采用机械性能测试仪对聚氨酯弹性体膜进行了机械性能测试;通过高温储存实验,考察了有机金属催化剂对聚氨酯树脂储存稳定性的影响;采用FTIR、GPC和1H-NMR等技术研究了聚氨酯树脂的降解机理.结果表明,不同金属离子催化剂对聚氨酯的合成及其储存稳定性有显著影响;树脂在高温储存过程中的黏度降低是聚氨酯分子链结构中的酯基发生醇解,进而导致分子量降低,弹性体机械性能下降.Weak polarity solvent aliphatic polyurethane（ PU） resins with PBGA as soft segment and IPDI,BDO,IPDA as hard segment were prepared by different organo-metallic catalysts（ stannous octoate,dibutyltin dilaurate,MB 20,BiCAT Zn,zirconium acetylacetonate,nickel acetylacetonate,neodymium neodecanoate,cerium neodecanoate）. The synthesized aliphatic PU resins were studied by FTIR and GPC. And,the mechanical properties of elastomeric films formed by aliphatic PU resins were tested. In addition,the effects of organo-metallic catalysts on the storage stability of aliphatic PU resins were investigated by storage at high temperature,and the influence mechanism was characterized by FTIR,GPC and1H-NMR. The researches show that different metal ions had obvious influence on the synthesis and the storage stability of aliphatic PU resins.The significant decreases of viscosity,molecular weight and mechanical properties were caused by the alcoholysis of ester groups of the PU chain during storage at high temperature,especially for the aliphatic PU resins catalyzed by BiCAT Zn and dibutyltin dilaurate.

关 键 词：有机金属催化剂 弱极性溶剂 脂肪族聚氨酯树脂 储存稳定性 醇解 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]