Abstract: Waterborne polyurethane adhesive emulsions were synthesized with isophorone diisocyanate（IPDI），dihydromethyl propionic acid（DMPA），polyester glycol（XH-111），trimethylolpropane（TMP）and 1,4-butanediol（BDO），and then reacted with hydroxy-ethyl acrylate（HEA）to cap the —NCO terminal groups. Such polyurethane emulsions were used to further copolymerize with acrylates to synthesize modified waterborne polyurethane composite emulsions through free-radical polymerization. Structure and thermal stability of the modified and unmodified polyurethanes were studied by FTIR and TGA，and effects of —COOH content，polyacrylate content and mass ratio of MA to BA on water resistance，mechanical property and bonding strength of the obtained polyurethane adhesive were discussed. Results showed that the water resistance，thermal stability and flexibitity of modified polyurethane adhesive behaved outstanding performance with bonding strength of 5.9 N/mm，in which —COOH content was 1.48% to 1.50%，polyacrylate content was 30% and the mass ratio of MA to BA was 4∶2.

摘要： 以异佛尔酮二异氰酸酯（IPDI）、二羟甲基丙酸（DMPA）、聚酯二元醇（XH-111）、三羟甲基丙烷（TMP）、1,4-丁二醇（BDO）和丙烯酸羟乙酯（HEA）等为主要原料，制得HEA封端的水性聚氨酯乳液，再加入丙烯酸酯单体进行自由基引发聚合制备出丙烯酸酯改性的水性聚氨酯胶黏剂乳液。通过傅里叶红外光谱（FTIR）、热失重分析（TGA）对改性前后水性聚氨酯结构和胶膜热稳定性进行了分析，并考察了—COOH含量、聚丙烯酸酯（PA）含量和丙烯酸甲酯（MA）与丙烯酸丁酯（BA）质量比对胶黏剂耐水性、力学性能和粘接强度的影响。结果表明，当w(—COOH)为1.48%～1.50%、w(PA)为30%、m(MA)∶m(BA)为4∶2时，改性水性聚氨酯胶黏剂的耐水性、耐热性和柔韧性优异，粘接强度可达5.9 N/mm。