漆酚甲醛缩聚物水基分散体系的相反转乳化

Phase Inversion Emulsification of Waterborne Dispersions of PUF

用复合表面活性剂将漆酚缩甲醛聚合物乳化为水包油型的稳定水基乳液。系统研究了乳化剂种类、乳化剂用量、H LB值和乳化温度等对相反转乳化过程的影响,并用乳液体系电导率变化和黏度变化表征了相反转乳化过程。实验结果表明,复合乳化剂吐温-20/司班-20乳化效果最好;高乳化剂用量和低乳化温度有利于水包油乳液的形成;当水和油的质量比(R)为1.05时,体系开始发生相反转,至R=1.4时,体系由油包水型转化为水包油型。相反转乳液粒径小,分布均匀。

Waterborne dispersion of PUF was prepared by phase inversion, using the compound emulsifier of A and B. The effects of emulsifier content, emulsifying temperature, HLB and the kinds of emulsifier on the phase inversion during emulsification process were investigated. The emulsification process and phase inversion were characterized by using the variation of conductivity and viscosity for the ternary system of PUF/ emulsifier/water. The results show that emulsification can be improved by using complex emulsifier of A and B. The higher emulsifier content and the lower emulsifying temperature are beneficial to waterborne dispersion of PUF. The phase begins to invert when R is 1.05 and the system has changed from W/O to O/W When R is 1.4. The particle diameter of phase inversion emulsion is within 1 μm～ 2 μm.