脲醛树脂包覆环氧树脂微胶囊的制备及性能研究

制备了脲醛树脂包覆环氧树脂(EP-UF)微胶囊，探讨了芯材与壁材的质量比、工艺条件对微胶囊的性能影响，以及微胶囊对EP基体的修复过程与修复能力。结果表明，当脲甲醛预聚体的合成温度为70℃、EP和苯甲醇的质量比为10:3、芯材与壁材的质量比为0.8、乳化剂用量为5%-7%、分散搅拌速度为500r/min、pH=3时，所制得的EP-UF微胶囊的平均粒径约为55μm，囊壁的密闭性好、强度高，芯材的包覆率高、流动性好，微胶囊填充EP基体材料的拉伸强度、修复率较高。

Preparation and Performance Research of Urea Formaldehyde Coated Epoxy Resin Microcapsules

Urea formaldehyde coated epoxy resin microcapsule was prepared.The effects of weight ration of core/shell materials and preparation condition on the performance of microcapsule were investigated.The healing process of microcapsule for epoxy resin matrix was studied.When the synthesis temperature of urea formaldehyde was 70oC and weight ratio of epoxy resin over benzyl alcohol was 10:3,weight ratio of core/shell materials was 0.8, and the amount of emulsifier was 5%~7%, the dispersing stirring speed was 500r/min,the obtained EP-UF microcapsule had an average particle size of 55μm with a good airtight property and high strength.When a higher coating ratio and a more flexible core was used, the microcapsule may reach higher tensile strength and higher healing rate.