脲醛预聚条件对电泳微胶囊形态的影响

以尿素和甲醛为壁材，油性蓝和二氧化钛纳米粒子分散在四氯乙烯中作为囊芯，通过原位聚合法制备了电泳微胶囊. 研究了脲醛预聚体制备条件对微胶囊形成和产品形态的影响，并通过设计正交实验得到了最优化的制备条件，即脲:甲醛为1:1.75(摩尔比)，反应温度75℃，pH值8.5，反应时间1 h. 在最优化条件下制备出的电泳微胶囊内外表面光滑，囊壁透明，分散性好且形态完整.

Effects of Synthesis Conditions for UF Prepolymer on Morphology of Electrophoretic Microcapsules

Electrophoretic microcapsules were prepared via in-situ interfacial polymerization using ureaformaldehyde (UF) resin as the outer membrane and oil blue and TiO2 nanoparticles dispersed in tetrachloroethylene as core materials. The effects of reaction conditions for the synthesis of UF prepolymer on the morphology of microcapsules were investigated and the optimal reaction conditions were obtained by the orthogonal design. The results showed that the optimum reaction conditions were molar ratio of urea to formaldehyde 1:1.75, reaction temperature 75℃, pH 8.5 and reaction time 1 h. The electrophoretic microcapsules prepared with such conditions had many merits, such as smooth inner and outer surface, transparence, good dispersity and complete morphology, etc.