以甲苯二异氰酸酯(TDI)、聚乙二醇(PEG)和N-甲基二乙醇胺(MDEA)等为主要原料,以蓖麻油(C.O.)作为部分聚醚多元醇的替代物,采用PU(聚氨酯)预聚体法制备出具有一定交联结构的亲水性阳离子型WPU(水性聚氨酯)乳液。结果表明:当体系交联度较低时,C.O.对WPU的改性效果不明显;当体系交联度较高时,WPU乳液稳定性及其胶膜耐水性等均随C.O.比例增加而提高;当n(PEG)∶n(C.O.)=7∶3时,WPU胶膜的耐水性(吸水率约6%)相对最好,其静态接触角(约82°)相对最大。 The main raw materials of toluene diisocyanate (TDI), polyethylene glycol (PEG) and N-methyldiethanolamine (MDEA) and the like, the castor oil (CO) ) Prepolymer method to prepare a certain cross-linked hydrophilic cationic WPU (aqueous polyurethane) emulsion. The results showed that when the degree of crosslinking was low, the effect of CO on WPU modification was not obvious. When the degree of crosslinking was high, the stability of WPU emulsion and the water resistance of the film increased with the increase of CO ratio. When n (PEG): n (CO) = 7: 3, the water resistance (water absorption of about 6%) of WPU film is the best, and its static contact angle (about 82 °) is the largest.