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以2,2-二羟甲基丙酸为亲水扩链剂,环氧树脂E-51为改性剂制得了以异氰酸酯基封端、含有羧基的聚氨酯预聚体。然后以季戊四醇三丙烯酸酯(PETA)对预聚体进行部分封端,将封端的预聚体与甲基丙烯酸甲酯(MMA)复合,并分散于水中,得到了含MMA的聚氨酯水分散体。最后,通过原位自由基聚合制得水性环氧树脂-聚丙烯酸酯-聚氨酯杂化乳液(WPUEA)。通过红外光谱、扫描电镜、透射电镜和热失重分析等对乳液及聚合物结构进行了表征并研究了E-51和MMA的用量对聚合物粒子性能的影响。结果表明,MMA和E-51用量分别为聚氨酯预聚体质量的25%~30%和7%~9%时,WPUEA乳液及聚合物的综合性能最佳。
Using 2,2-dimethylol propionic acid as hydrophilic chain extender and epoxy resin E-51 as modifier, isocyanate-terminated and carboxyl-containing polyurethane prepolymer was prepared. The prepolymer was then partially capped with pentaerythritol triacrylate (PETA), the capped prepolymer was compounded with methyl methacrylate (MMA) and dispersed in water to give an aqueous polyurethane dispersion containing MMA. Finally, waterborne epoxy-polyacrylate-polyurethane hybrid emulsion (WPUEA) was prepared by in-situ free radical polymerization. The structure of the emulsion and polymer were characterized by IR, SEM, TEM and TG. The effects of the amount of E-51 and MMA on the properties of polymer particles were investigated. The results showed that WPUEA emulsion and polymer had the best comprehensive performance when the contents of MMA and E-51 were 25% ~ 30% and 7% ~ 9%, respectively.