新型聚酯多元醇水分散体的制备

Preparation of Novel Polyester Polyol Dispersion

先采用间苯二甲酸-5-磺酸钠(5-SSIPA)与新戊二醇(NPG)反应制得聚酯中间体,再将一定量的聚酯中间体与多元羧酸和多元醇进行反应,同时引入叔碳酸缩水甘油酯(CARDURA E-10),制备了聚酯多元醇水分散体。用红外光谱(FT-IR)和激光粒度分析仪对产物结构及其稳定性进行了表征;并考察了5-SSIPA/NPG对聚酯中间体的影响及合成工艺、催化剂、聚酯中间体用量、叔碳酸缩水甘油酯对反应体系的影响。结果表明:选择合适的合成工艺或加入催化剂可明显缩短反应时间;聚酯中间体用量约为单体总质量的12%时,得到的产物稳定性较好;叔碳酸缩水甘油酯的引入能有效降低树脂的黏度、减小水分散体粒径,并提高涂膜最终的耐酸、耐碱及耐水性能。

A polyester intermediate was synthesized using 5 -sulfoisophthalic acid monosodium salt and neopentyl glycol as materials,which was then used to prepare polyester polyol dispersion with polycarboxylic acids, polyols and CARDURA E10. The structure and the stability of the product were characterized by fourier transform infrared （ FT - IR） and laser particle size analyzer. The effect of 5 - SSIPA/NPG on the prop- erties of the polyester intermediate and the influences of sythetic process, catalyst, amount of polyester intermediate and CARDURA E10 on the reaction system were investigated. The experiment results showed that the reaction time could be shortened remarkably by selection of suitable synthetic process or addition of catalyst. The dispersion showed a better stability when 12% intermediate was used. In addtion, the viscosity of polymer would be reduced, the particle size of dispersion would be minished and the acid, alkali and water resistance of the film would be improved when incorporated with CARDURA E10.