聚酯二元醇的合成及水性聚氨酯的制备及其性能

Preparation and properties of polyester diol and waterborne polyurethane

以对甲苯磺酸为催化剂,己二酸和1,3-丙二醇为原料,合成了一种聚酯二元醇.单因素实验结果表明,其最佳的合成条件为n(1,3-丙二醇)∶n(己二酸)=1.3∶1、催化剂用量为1%(按反应体系中醇酸的总质量计)、减压反应温度为130℃、减压反应时间为3h.傅里叶变换红外光谱和核磁谱图的分析结果表明:最终产物结构与目标产物结构一致.凝胶渗透色谱测定结果表明合成的聚酯二元醇的相对分子质量为1 019,多分散性为1.073;X射线衍射测定结果表明其结晶度为25.92%.分别以合成的聚酯二元醇和市售聚酯二元醇为原料合成了水性聚氨酯,结果表明,采用自制聚酯多元醇制备的水性聚氨酯胶膜的弹性较好,手感柔软,结晶度低,但耐水性较差.

A kind of polyester diol was synthesized in which para-toluenesulfonic acid was as catalyst？ adipic acid and 1 . 3-dipropylene glycol were as raw materials. The results of single-factor test show that the optimum conditions are that the molar ratio of 1,3-propanediol with adipic acid is 1 . 3, the amount of catalyst is 1 % （basing on the total weight of 1,3-dipropylene glycol and adipic acid）,reaction temperature is 130℃ and the reaction time is 3 h. The re-sults of infrared spectrum and 1 H-NMR spectrum show that the structure of product is same with the expected product. The GPC characterization shows that the relative molecular mass is 1 019 and the polydispersity is 1. 073. The crystallinity degree of product is 25. 92%. Two kinds of waterborne polyurethanes were prepared by using polyester diol Prepared by the la-boratory and commercial polyester diol, respectively. The experiment results show that the e-lasticity of waterborne polyurethane film prepared by polyester diol Prepared by the labora-tory is better than that prepared by using commericial polyester diol,as well as the handle is softer,the degree of crystallinity is less,but the water resistance is worse.