Co-Esterification Process for Synthesis of Aliphatic-Aromatic Co-Polyester Poly(Butylene Succinate-co-Butylene Terephalate)
1. College of Chemical and Biological Engineering, State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou 310027, China;
2. Yizheng Chemical Fiber Company Limited, SINOPEC, Yizheng 255000, China
Abstract：In order to develop a polymerization technology to produce aliphatic-aromatic copolyester poly(butylene succinate-co-butylene terephalate) (PBST) utilizing 3-autoclave industrial equipment, the kinetics and process of co-esterification of succinic acid (SA), terephthalic acid (TPA) and 1,4-butadienediol (BDO) were investigated in this study. It was found that the esterification of SA mainly occurs at the early stage and that of TPA at the late stage of the co-esterification. The BST co-esterification system exhibits kinetics similar to that of “parallel esterification” estimated from of separate BS and BT esterification systems, and therefore is feasible to be used with successive co-polycondensation to synthesize PBST. It appeared that the reaction temperature, molar ratio of diol to diacid and catalyst amount all have significant impact on the co-esterification reaction. Under the conditions at co-esterification temperature 210 ℃, molar ratio of diol to diacid 2.0 and catalyst amount 0.1%(mol), a PBST copolyester with intrinsic viscosity of 1.2 dL/g and satisfactory color was successfully synthesized using binary catalyst system tetrabutyl titanate and lanthanum acetylacetonate or TBT-La(acac)3 (molar ratio of Ti to La was 1).
Sun Yongjian 1,Wu Linbo 1,Li Naixiang 2 et al. Co-Esterification Process for Synthesis of Aliphatic-Aromatic Co-Polyester Poly(Butylene Succinate-co-Butylene Terephalate)[J]. 化学反应工程与工艺, 2016, 32(1): 78-82.
