钛酸四乙酯催化酯交换缩聚法合成聚醚型聚氨酯  

Tetraethyl titanate as a catalyst for the synthesis of polyether-polyurethanes by transurethane polycondensation

作　　者：刘冰灵 田恒水[1] 崔喜[1] 

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《化工进展》2016年第3期856-860,共5页Chemical Industry and Engineering Progress

摘　　要：以钛酸四乙酯(TET)为催化剂,聚四氢呋喃醚二醇(PTMG)和1,6-六亚甲基二氨基甲酸甲酯(HDC)为原料,1,4-丁二醇为扩链剂,酯交换缩聚合成了聚醚型聚氨酯(PEPU)弹性体。以二丁基氧化锡(DBTO)催化合成的PEPU为参考,通过红外光谱(FTIR)、凝胶色谱(GPC)、热重分析(TGA)、力学性能与光学性能测试表征TET的催化效果。通过一系列单因素实验探讨了缩聚温度、缩聚时间、预聚温度、预聚时间对PEPU特性黏度的影响规律。结果表明,TET比DBTO催化制得的PEPU热性能更好,力学性能更优。较佳的制备工艺为:预聚阶段温度为110℃,压力为0.070MPa,时间为20min;160℃下高真空缩聚110min。Thermoplastic polyether polyurethanes（PEPUs） were prepared by a transurethane polycondensation method with poly（oxytetramethylene） glycol（PTMG） as a soft segment,dimethylhexane-1,6-dicarbamate（HDC） and 1,4-butanediol（BDO） as hard segments in the presence of tetraethyl titanate（TET）. FTIR,GPC,TGA and mechanical and optical property tests were used to characterize the catalytic performance of TET and compare with a standard catalyst of dibutyltin oxide（DBTO）. The effects of synthesis conditions such as polycondensation temperature,polycondensation time,prepolymerization temperature and prepolymerization time on the intrinsic viscosity of PEPUs were discussed by a series of single factor experiments. The results showed that PEPU with TET as a catalyst exhibited better thermal and mechanical properties than PEPU with DBTO as a catalyst did. And the optimal processing conditions were：the prepolymerization reaction was carried out at 110℃for 45 min under a reduced pressure of 0.070 MPa and the polycondensation reaction was conducted at 160℃ for 110 min under vacuum.

关 键 词：钛酸四乙酯 催化剂 酯交换缩聚 合成 聚氨酯 黏度 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]