水可分散型聚酯多元醇反应动力学研究

用质量分数为5％的间苯二甲酸二甲酯．5-磺酸钠与1，4-丁二醇进行酯交换，其交换后的二醇以及1，4-丁二醇的混合物再和己二酸缩舍得水可分散的聚酯多元醇，用红外光谱仪(IR)和核磁共振仪(^1H NMR)对产物结构进行了表征，并对酯化反应动力学进行了研究。在无外加酸的催化下，考察了反应温度、反应时间等与酯化反应速率的关系，对反应的机理进行了推导，并对试验结果进行了解释。研究结果表明，上述体系在无外加酸存在下，不同于一般的聚酯缩舍聚合，其过程符会二缀半反应动力荤．

The Study on Kinetic of Aqueous Polyester Polyol

With the aim of lowing the emissions of organic solvents, aqueous coating compositions are increasingly being used in place of solvent-borne systems. Polyurethane made from water-dispersible sulfopolyester polyols have the advantages of simple process, good performance and stability. In this article the sulfopolyester diol was synthesized by condensation polymerization of adipic acid, dimethyl-5-sodiosulfoisophthate and 1,4-dutanediol. The structures of polyester polyol were characterized by IR and 1H NMR. A mechanism on polymerization was proposed based on autocatalitic reaction. The results indicated that the kinetic process of polyesterization reaction without catalyst is in good agreement with half to third order homogeneous model at large extents of reaction. It is different from the results reported previously in which a third-order reaction mechanism was suggested.