采用原位聚合的方法,以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯二元醇(PCDL-1000)、1,4-丁二醇(BDO)、2,2-二羟甲基丙酸(DMPA)、丙烯酸缩水甘油酯(GMA)等为主要原料,合成交联型水性聚氨酯-丙烯酸酯复合乳液(WPUA).系统研究了交联剂用量对复合乳液及其胶膜性能的影响,并通过 FT-IR、TGA、XRD、SEM表征了复合乳液及其胶膜的结构和性能.结果表明,适度交联能够提高材料的力学性能及耐水性能,当n(GMA)(DMPA)＝0．1~0．2时,所得WPUA乳液性能稳定,聚合物具有良好的热稳定性及耐水性,吸水率低至5．4％；拉伸强度达到28．9 MPa,较未交联胶膜的拉伸强度提高了173％.%A novel emulsion of crosslinked waterborne polyurethane-acrylic copolymers (PUA)was successfully synthesized by in-situ emulsion copolymerization method in this paper,using IPDI,PCDL-1000,BDO,DMPA, GMA as the main raw material.The effects of the content of crosslinking agent on the properties of composite emulsion and its films was studied systematically.FT-IR,TGA,XRD,SEM were employed to investigate the structures and properties of the composite latex and their polymers.The results showed that moderate crosslinking could contribute to improving the water resistance and mechanical properties of materials.When n(GMA)(DMPA)=0.1-0.2,the WPUA latex has a stable performance as well as an excellent thermal stabil-ity and water resistance of the polymer,the bibulous rate of the crosslinked films was low to 5 .4%.The tensile strength of the crosslinked WPUA films achieved 28.9 MPa,increased by 173% of the uncrosslinked one.
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