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以不同离子型和不同HLB(亲水亲油平衡)值的外乳化剂作为试验对象,采用内乳化-外乳化法合成高固含量的WPU(水性聚氨酯)分散体。研究结果表明:当外乳化剂在预聚体乳化前加入且w(阴离子型外乳化剂)≤2%(相对于反应原料质量而言)时,可获得黏度适中、储存稳定、耐介质性能和力学性能较好的高固含量WPU。
The external emulsifier with different ionic and different HLB (hydrophilic-lipophilic balance) values was used as the test object to synthesize WPU (aqueous polyurethane) dispersions with high solid content by internal emulsification-external emulsification. The results show that when the external emulsifier is added before the prepolymer emulsification and w (anionic emulsifier) is less than or equal to 2% (relative to the mass of the raw materials), the viscosity of the external emulsifier can be moderate, the storage stability, Better mechanical properties of high solids WPU.