HDI/IPDI物质的量比对PPG型水性聚氨酯性能及微观形貌的影响  

Effect of HDI / IPDI Molar Ratio on Properties and Micro Morphology of PPG-Based Waterborne Polyurethane

作　　者：刘文济[1] 丁伟[1] 涂伟萍[1] 胡剑青[1] 王锋[1] 戴飞亮 

机构地区：[1]华南理工大学化学与化工学院,广州510640

出　　处：《涂料工业》2015年第11期40-44,共5页Paint & Coatings Industry

摘　　要：将聚氧化丙烯二醇(PPG)、1,6-己二醇(HDO)、二羟甲基丙酸(DMPA)与不同物质的量比的六亚甲基二异氰酸酯(HDI)和异佛尔酮二异氰酸(IPDI)反应,通过预聚体混合法制备了一系列环境友好的PPG型水性聚氨酯。利用FT-IR、DSC、SEM等研究了HDI/IPDI物质的量比对水性聚氨酯的性能和微观形貌的影响。结果表明:随着HDI/IPDI物质的量比的增加,水性聚氨酯链段的氨基甲酸酯键之间的氢键密度增加,水性聚氨酯分散体的平均粒径增大,硬段的结晶性和柔韧性随之提高,同时促进了软段的拉伸诱导结晶。PPG-based Waterborne polyurethane （WPU） dispersions were synthesized from poly（ propylene glycol） （ PPG）, dimethylolpropionic acid （ DMPA）, 1,6-hexanediol （ HDO）, different molar ratio of 1,6-hexamethylene diisocyanate （HDI） and isophorone diisocyanate （IPDI） via a prepolymer mixing process. The effect of HD//IPDI molar ratio on the performance and micro morphology of PPG-based WPU dispersion was studied by means of Fourier transform infrared （ FT- IR） spectroscopy, differential scanning calorimetry （ DSC ） and scanning electron microscope （SEM）, etc. The results indicated that the particle size of WPU dispersions increased, the flexibility and crystallinity of hard-segment, hydrogen bonds density between carbamates were enhanced as well as the induced crystallization of soft segment was promoted as the molar ratio of HDI/IPDI increased.

关 键 词：水性聚氨酯 PPG型 粒径 结晶性 诱导结晶 

分 类 号：TQ630.1[化学工程—精细化工]