由甲苯二异氰酸酯（TDI）、聚己内酯二醇（PCL）和二羟甲基丙酸（DMPA）反应,再与高醚化度甲醇醚化三聚氰胺甲醛树脂（HMMM）反应,制备了一种交联型阴离子水性聚氨酯。采用红外光谱对样品进行表征,并讨论了交联改性对聚氨酯乳液粒径分布、胶膜耐水性、力学性能、热稳定性及结晶度的影响。红外分析证实HMMM与聚氨酯发生了交联反应。当m（HMMM）∶m（—COOH）=2.25时,胶膜拉伸强度达到30.3MPa,吸水率为17.2%,吸乙醇率为10.9%,与水接触角为69.6°,Tmax（最快分解温度）为301.5℃,结晶度为1.10%。
A new crosslinked aqueous anionic polyurethane was prepared by toluene diisocyanate（TDI）,polycaprolactone（PCL）,dimethnololpropionic acid（DMPA） and neutralized by triethylamine（TEA）.Then the aqueous polyurethane reacted with hexamethoxymethyl melamine（HMMM） as a cross-linking agent.The product was characterized by FT-IR.And particle size distribution of waterborne polyurethane was researched,the water resistance,mechanical properties,thermal stability and crystallinity of the film were also tested.The FT-IR spectrum indicated that HMMM was crosslinked with polyurethane,and when m（HMMM）∶m（—COOH）=2.25,tensile strength is up to 30.3MPa,water absorption rate and ethanol absorption rate decreased to 17.2% and 10.9%,contact of angle increased to 69.6°,Tmax is 301.5℃,crystallinity decreased from 3.77% to 1.10%.
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