乳化剂对原位聚合蜜胺甲醛树脂微胶囊成囊性的机理研究

Effect of Emulsifier on the Encapsulation of Melamine Formaldehyde Resin Microcapsule

以苯乙烯马来酸酐的共聚物树脂作为乳化剂,研究了其对形成蜜胺甲醛树脂微胶囊的乳化和成囊的作用机理。结果表明:乳化剂用量和pH值对微胶囊制备的成囊性和ζ电位有至关重要的作用,它直接影响微胶囊制备的成功以及胶囊粒子的平均粒度和粒径分布。乳化形成双电层结构。乳化剂的作用主要是乳化稳定和电荷效应,使壁材在芯材液滴表面进行有效的缩聚反应并抑制其在水相中的副反应。

The effect of the emulsifier styrene maleic anhydride copolymer （SMA） on the emulsification and encapsulation of melamine formaldehyde resin microcapsule was studied. The results indicated that the dosage and pH value of the emulsifier have important effects on zeta potential and encapsulation in the process of in-situ polymerization. The emulsifier influences the capsule preparation, mean particle size and particle size distribution of microcapsules. The process of emulsification forms electric double layer. The main function of the emulsifier is to make emulsification stable and has electric charge effect, which can make the wall material poly-condensate on the surface of the droplets, and prevent the side reaction taking place in the water phase.