以异佛尔酮二异氰酸酯（IPDI）和己二异氰酸酯（HDI）为硬段,聚己内酯二醇（PCL1000）为软段,引入环氧树脂（E-44）,采用原位聚合制得环氧改性阳离子水性聚氨酯乳液（EPUA）。通过傅里叶红外光谱（FT-IR）、耐介质性测试、接触角及力学性能测试研究了聚合物的构性关系。研究了E-44用量对聚合物及施胶性能的影响,并用扫描电镜（SEM）对纸张表面处理前后进行了表征。实验结果表明,当n（NCO）/n（OH）=1.3,m（MDEA）=10%,m（E-44）=12%时,乳液性能较佳,改性效果最好。在最佳聚合工艺条件下,施胶度为78s,湿强度达39%,耐折也达57次。随着m（E-44）增大,聚合物胶膜的耐介质性增强,吸水率从13.69%降至6.46%,吸甲苯率由121.5%降至74.8%,接触角由64.85°增大到116.49°,力学测试也表明拉伸强度随m（E-44）的增大得到改善,断裂伸长率减小。
A series of cationic water-based polyurethane emulsion modified by epoxy resin were successfully prepared by in situ polymerization using isophorone isocyanate(IPDI),hexamethylene-1,6-diisocyanate(HDI) and polycaprolactone diols(PCL1000),then epoxy resin(E-44) were introduced for crosslink modification.Fourier transform infared spectrometer(FT-IR) were used to characterize the structure of the polymer.Medium resistance,mechanical properties and water contact angle of the cast films were also measured.Effects of E-44 content on the properties of polymer and sizing performance were investigated.The surface of the paper before and after treatments were observed by scanning electron microscope(SEM).The results show that the emulsion and sizing performance were excellent when n(NCO)/n(OH)=1.3,m(MDEA)=10%,m(E-44)=12%.At the same time,the papers sizing value can reach 78s,and wet strength approaches 39%,folding endurance 57 times.With the increase of E-44 content,the water absorption of the film decreased from 13.69% to 6.46%,toluene absorption from 121.5% to 74.8%,the contact angle of the film increased from 64.85° to 116.49°,as well as the mechanical strength increased.
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