Abstract: Microcapsules consisting of 58# paraffin wax used as the cores and melamineformaldehyde resin used as the shell were synthesized by the insitu polymerization, and the improvement of apparent morphology and core content of microcapsules was researched. The effects of pH adjustment method, the type of curing agent and stratified treatment on morphology and thermal storage property of microcapsule were studied by SEM, PSDA and DSC. It indicates that pH adjustment is an important factor to microcapsules' morphology and the overall property of microcapsules is greatly improved when NaCl is used as curing agent. After stratified processing, particle sizes of the microcapsules show unimodal distribution and core material content is up to 86.1%.

Key words: Microencapsulated phase transition, Morphology control, Melamine resin, Paraffin wax, Twostep method

摘要： 采用原位聚合法,以58# 固体石蜡为芯材,蜜胺树脂为壁材制备出了石蜡/蜜胺树脂相变微胶囊,并对微胶囊的表观形貌改善和芯材含量提高的方法进行了研究。探讨了pH 的调节方式,固化剂的种类和用量以及微胶囊的分层处理对微胶囊的形貌和储热性能的影响规律,采用SEM、PSDA和DSC对微胶囊的性能进行了表征。研究表明,pH 的调节是微胶囊形貌调控的重要影响因素;NaCl作固化剂时,微胶囊的整体形貌得到很大的改善;经分层处理后,制得的微胶囊颗粒均匀、光滑圆润,微胶囊的颗粒大小呈现单峰分布,且密度较小的上层微胶囊的芯材质量分数高达86.1%。

关键词: 相变微胶囊, 形貌调控, 蜜胺树脂, 固体石蜡, 两步法