双重自交联聚氨酯-丙烯酸酯复合乳液的合成

Synthesis of Double Self-Crosslinked Polyurethane Acrylate Hybrid Emulsion

以甲苯二异氰酸酯(TDI-80)、聚醚二元醇(Diol-1000)、丁二醇(BDO)、二羟甲基丙酸(DMPA)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸缩水甘油酯(GMA)、己二酸二酰肼(ADH)和二丙酮丙烯酰胺(DAAM)等为原料,采用原位乳液聚合法,合成了酮肼、环氧羧基双重自交联型聚氨酯-丙烯酸酯(PUA)复合乳液。研究了酰肼基/异氰酸酯基、酮羰基/酰肼基和环氧基团含量对乳液制备过程、乳液及涂膜性能的影响。研究结果表明,当PUA复合乳液中的ADH、DAAM、DMPA化合物中的—COOH和GMA的含量(占PUA的质量分数)分别为4.1%、2.2%、1.6%和4.0%时,复合乳液涂膜铅笔硬度达3H,耐水性和耐化学品性得到改善。PUA胶粒的平均粒径在100 nm左右时,分布更均匀。

A double self-crosslinked polyurethane-acrylate （PUA） hybrid emulsion crosslinked not only by ketone and hydrazide groups but also by epoxy and carboxyl groups was synthesized by emulsion polymerization in situ with toluene diisocyanate （ TDI-80 ）, polyether binary alcohol （ Diol-1000 ）, butanediol （ BDO ）, dimethylol propionic acid （ DMPA ）, methyl methacrylate （ MMA ）, Glycidyl mcthacrylate （ GMA ）, adipic dihydrazide（ADH） and diacetone acrylamide （DAAM） as reactants. The influence of the ratio of hydrazide group to isocyanate group, the ratio of ketone group to hydrazide group to the dosage of epoxy group on the preparation and performance of the emulsion and its film was studied. When the mass fractions of ADH, DAAM, COOH in DMPA and GMA in PUA were respectively 4. 1%, 2.2%, 1.6%, and 4.0%, the emulsion and film both exhibited good properties. The pencil hardness of the double self-crosslinked PUA hybrid emulsion was 3H. The results obtained by particle size analyzer show that the average particle size of the PUA was about 100 nm and the particle size distribution was uniform.