摘要： 涂料应用中往往会出现一些人们肉眼难以察觉的损伤。若存在一种自修复材料,能够在涂层破损时发挥自愈作用,则可以大大延长涂料的寿命。本研究制备了一种微胶囊,以填料的方式加入到涂料中,可对受损涂层起到自修复的作用。采用原位聚合法,以KH-550改性的双酚F环氧树脂为囊芯原料,合成脲醛树脂包裹环氧树脂的微胶囊。探讨了原料比、乳化剂用量、搅拌速率等因素对微胶囊性能的影响。结果表明:当囊壁与囊芯的质量比为1∶0.8,乳化剂SDBS用量为0.8%,搅拌速率为300 r/min,酸化时间为2～3 h,控温60℃时微胶囊的各项性能较好。

关键词: 微胶囊, 原位聚合, 改性环氧树脂, 自修复涂料

Abstract: Damage of coating film is not often able to be detected visually. But a self-repairing material, could provide a self-healing role when coating suffers damage, extending the service life.This research aimed to prepare a kind of self-healing microcapsules that could be added into the paint to repair the damaged coatings.The microcapsule. with polyurea formaldehyde as shell. and KH-550 modified bisphenol F epoxy resin as the core, was synthesized by in-situ polymerization. The influence of the amount of emulsifier, composition of raw materials and agitation rate on the performance of microcapsule were discussed. The results showed that the mass ratio of the shell materials to the core materials=1: 0. 8; the content of sodium dodecylbenzene sulfonate(SDBS)0.8%; agitation rate 300 r/min; reaction time 2-3 h; reaction temperature 60 ℃, the microcapsules showed good performance.

Key words: microcapsule, in-suit polymerization, modified epoxy resin, self-healing coatings