PBT耐水解催化剂的催化活性及耐水解性能研究

Study on hydrolysis resistance of PBT and catalytic activity of hydrolysis resistant catalysts

在钛酸四丁酯(TBT)的1,4-丁二醇(BDO)溶液中加入络合剂制备了合成聚对苯二甲酸丁二醇酯(PBT)用络合型耐水解催化剂(RWC),并通过水解和间歇聚合实验研究了催化剂RWC的催化活性及耐水解性能。结果表明:催化剂RWC具有较好的耐水解性能,在常温下放置7 d或196℃高温下均未出现水解现象,而常规催化剂TBT在常温下即出现水解白色絮状沉淀物;催化剂RWC具有与TBT相当的催化性能,分别用TBT,RWC催化剂,所制得PBT试样的特性黏数分别为1.006,0.992 d L/g,端羧基含量分别为25.4,30.5 mmol/kg,产品质量接近。

A complex hydrolysis resistant catalyst （RWC） for polybutylene terephthalate （PBT） was synthesized by adding a complexing agent into the 1,4-butanediol （BDO） solution of tetrabutyl titanate （TBT）. The catalytic activity and hydrolysis re- sistance of RWC were studied by hydrolysis and batch polymerization experiments. The results showed that the catalyst RWC ex- hibited fairly good hydrolysis resistance, therefore the hydrolysis reaction did not occur during the storage at room temperature for 7 d or at 196 ℃ ; the conventional catalyst TBT generated white flocculent hydrolysis precipitation at room temperature; RWC had the equal catalytic activity to TBT; the obtained PBT prepared by using TBT and RWC had the equal quality and the intrinsic vis- cosity of 1. 006 and 0. 992 dL/g, carboxyl end group content of 25.4 and 30.5 mmol/kg, respectively.