中文摘要：

为了制备耐水性能较好的水性聚氨酯（WPU），以聚酯二元醇（PBA）、甲苯二异氰酸酯（TDI）和二羟甲基丙酸（DMPA）等为主要原料合成了WPU乳液，着重探讨了DMPA含量、疗值｜即n（-NCO）／n（-OH）｜和交联剂对WPU胶膜耐水性能的影响。实验结果表明，当wCDMPA）=4％、R=1．5时，制得的WPU胶膜耐水性较好；采用不同的室温交联剂对WPU进行交联改性，当w（氮丙啶型交联剂A）=3％时（相对于WPU乳液干固量而言），WPU胶膜的吸水率降低至3％左右，并具有较好的持久耐水性。

英文摘要：

In order to prepare waterborne polyurethane（WPU） with better water resistance, the WPU emulsion was synthesized with polyester diol （PBA）, toluene diisocyanate （TDI） and 2,2-dimethylol propionic acid （DMPA） as main raw materials. The influences of DMPA content, R value（namely molar ratio of -NCO to -OH） and cross linker were elaborated on water resistance of WPU pliofilm. The experiment results showed that the WPU pliofilm had better water resistance when mass fraction of DMPA was 4% and R value was 1.5. When the mass fraction of aziridine cross linker A was 3% in dry solid content of WPU emulsion, the water absorption of WPU pliofilm modified by different room temperature cross linker could be reduced to about 3%, and the WPU pliofilm had better permanent water resistance.