蓖麻油改性阳离子型水性聚氨酯的合成及性能

摘要

采用蓖麻油、异佛尔酮二异氰酸酯、聚己二酸乙二醇酯、聚丙二醇、一缩二乙二醇、N-甲基二乙醇胺、三羟甲基丙烷,合成了一系列蓖麻油改性阳离子型水性聚氨酯分散液.用红外光谱分析、粒径测试、智能电子拉力试验、摆杆硬度测试、热分析等对所合成的聚氨酯的结构、乳液的粒径和膜性能进行测试.结果表明:随着蓖麻油用量的增加,阳离子型水性聚氨酯乳液的粒径逐渐增加,膜的摆杆硬度及耐水性能逐渐增强:蓖麻油在树脂中质量分数达8.4％时,膜的摆杆硬度达到0.86;而蓖麻油在树脂中质量分数达6.4％时,阳离子型水性聚氨酯胶膜浸泡24 h的吸水率几近为零；且蓖麻油的引入,使胶膜的耐热性也有所提高.%Castor oil modified cationic waterborne polyurethane ( WPU) dispersions are prepared from castor oil,isophorone diisocyanate ( IPDI) ,polyethyleneglycol adipate ( PEGA ) ,polypropylene glycol (PPG),diethylene glycol (DEG) ,N - methyldiethanolamine ( MDEA) and trimethylolpropane(TMP) . The structure,emulsion particle distribution and film properties of the resulted WPU are characterized by Fourier transform infrared( FT - IR) ,particle size analyzer,intelligent tensile machine,pendulum tester and thermal gravimetric analysis ( TGA ) . The result indicates that the increase of castor oil leads to increase of emulsion particle size,and improvement of pendulum hardness and water resistance of the cured film. Specifically when the content of castor oil is 8. 4% ,the pendulum hardness of film is 0. 86. And when the content of castor oil is wt. 6. 4% ,the film shows its water absorption nearly zero after immersed for 24 hrs. Additionally ,the incorporation of castor oil causes improvement of heat resistance.