【摘要】 用异佛尔酮二异氰酸酯(IPDI)、聚丙二醇2000(PPG2000)、2,2-双(羟甲基)丙酸(DMPA)为主要原料合成预聚体,环氧树脂(E44)开环合成环氧改性水性聚氨酯(EWPU),考察了不同影响因素对EWPU乳液及胶膜性能的影响。首先,通过FT-IR证实了环氧改性水性聚氨酯的合成;然后,经过TG测试证明了改性后水性聚氨酯耐热性能优于水性聚氨酯;最后详细探究了DMPA量、—NCO与—OH的摩尔比(R值)、硬单体配比以及环氧量对EWPU乳液粒径、贮存稳定性、涂膜耐水性、涂膜耐磨性和力学性能的影响。结果表明,当DMPA量为5%、R值为1.5、硬单体配比为35%、EP量为8%时,EWPU乳液的综合性能最优。更多还原

【Abstract】 Polyurethane prepolymers were synthesized firstly by isophorone diisocyanate(IPDI),polyoxypropylene glycol 2000(PPG2000)and dimethylol propionic acid(DMPA),then epoxy resin(E44)was ring opened to synthesize epoxy-modified waterborne polyurethane(EWPU).The effects of different factors on the performance of EWPU and coating film were tested.Firstly,the synthesis of EWPU was confirmed by FT-IR.And then,TG test showed that the heat resistance of EWPU was better than that of WPU.Finally,the effects of the amount of DMPA,the molar ratio of—NCO to—OH(R value),the ratio of hard monomers and the amount of epoxy on the performance,which including the particle size,storage stability,water resistance of the coating,film wear and mechanical properties of EWPU were investigated.The results show that the EWPU had the best overall performance when the DMPA content was 5%,the R value was 1.5,the hard monomer ratio was 35%,and the EP content was 8%.更多还原