WPU预聚体中羧基含量及其位置对树脂的粒径及其耐水性之影响的研究  

THE INFLUENCE OF CONTENT AND POSITION OF CARBOXYL GROUP IN PREPOLYMER ON THE PARTICLE SIZE AND WATER-RESISTANCE OF WPU

作　　者：郝广杰[1,2] 张邦华[1,2] 宋谋道[1,2] 周庆业[1,2] 

机构地区：[1]南开大学高分子化学研究所,天津300071 [2]吸附分离功能高分子材料国家重点实验室,天津300071

出　　处：《离子交换与吸附》1998年第3期250-255,共6页Ion Exchange and Adsorption

摘　　要：本文先将马来酸酐与多元醇作用，然后再与其它单体反应，合成了含有羧基的聚氨酯预聚体，并用丁酮稀释后，在普通搅拌条件下使预聚体分散于三乙醇胺的水溶液中，合成出以水为分散介质的聚氨酯分散体系（WPU）。并通过改变羧基在预聚体中的含量和位置，发现随着羧基含量的增加，WPU的粒径减小，而耐水性下降。同时发现，在一定的羧基含量下，同侧羧基相比，端羧基更有利于预聚体的乳化，制得的WPU不仅颗粒较小，而且树脂耐水性明显优于侧基羧预聚体制备的WPU，从而提出羧基的运动自由度是影响羧基乳化活性和树脂耐水性的重要因素。The waterborne polyurethane(WPU) is synthesized in two different methods with the same prescriptions. We prepared the WPU prepolymer containing side -carboxyl group through maleic anhydride reaction with trimethanolpropane and the prepolymer containing terminal carboxyl group through maleic anhydride reaction with PPG-1000. Comparing the two kinds of prepolymer and their WPU, We found that the terminal-carboxyl prepolymers produce WPU with smaller particles and better water-resisting films than the side-carboxyl prepolymer with the same COOH content. So that, it is given out that the mobility of carboxyl group in prepolymer is crucial to the control of the size of WPU particle and water-resistance of WPU film

关 键 词：预聚体 制备 WPU 水性聚氨酯 聚氨酯乳液 耐水性 

分 类 号：O633.221[理学—高分子化学]