自修复微胶囊的制备及其影响因素研究

Preparation of Self-repairing Microcapsules and Study on Its Influencing Factors

采用环氧树脂(E-51)和环氧小分子(SM80)为芯材、脲醛树脂为壁材,利用原位聚合法制备自修复微胶囊。采用光学显微镜(OM)观察了微胶囊的形成过程;采用扫描电子显微镜(SEM)考察了乳化剂种类对微胶囊微观形貌的影响;采用傅里叶红外光谱仪(FTIR)分析了微胶囊的化学成分;利用激光粒度仪分析了微胶囊的粒径分布;考察了不同乳化速度对微胶囊粒径分布的影响。试验结果表明:采用聚氧乙烯脱水山梨醇单油酸酯(吐温-80)作为乳化剂,其用量占芯材含量的3.0%,乳化转速为2000r/min时,制备的脲醛树脂微胶囊外形基本呈现球状,粒径分布较为均匀,红外分析表明已经成功制备了脲醛树脂微胶囊。

A self-repairing microcapsules was prepared by in-situ polymerization using epoxy resin(E-51)and epoxy small molecule(SM80)as core material and urea-formaldehyde resin as shell material.The encapsulation process of microcapsules was observed by optical microscopy(OM),the effect of emulsifier types on the surface micromorphology of microcapsules was investigated by scanning electron microscopy(SEM),the chemical composition of microcapsule was analyzed by FTIR,and particle size distribution of microcapsules was analyzed by laser particle size analyzer,the effect of emulsifying rotation speed on the particle size d istribution of microcapsules was investigated.The test results indicated that polyoxyethylene sorbitan monooleate(Tween-80)was used as emulsifier, the amount of which accounts for 3.0% of the core material content,and the emulsion speed was 2 000 r/min,ureaformaldehyde resin microcapsules was synthesized,with round shape,uniform distribution of particle size and the results of FTIR indicated that urea-formaldehyde resin microcap sules can be synthesized successfully.