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以石蜡为芯材,蜜胺树脂(MF)为壁材,采用原位聚合法制备了石蜡相变微胶囊。分别采用傅立叶变换红外光谱仪(FTIR)、差示扫描量热仪(DSC)和扫描电子显微镜(SEM)对微胶囊的结构、性能和形貌进行了分析和表征,讨论了甲醛与三聚氰胺的摩尔比对微胶囊相变性能和形貌的影响。结果表明,n(甲醛)/n(三聚氰胺)>4时,微胶囊之间发生粘结,出现了团聚现象;微胶囊的相变温度略高于芯材石蜡,随着n(甲醛)/n(三聚氰胺)增加,微胶囊的相变潜热降低。
Using paraffin as core material and melamine resin (MF) as wall material, paraffin phase-change microcapsules were prepared by in-situ polymerization. The structure, properties and morphology of the microcapsules were analyzed and characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) respectively. The effects of molar ratio of formaldehyde to melamine Effect of Microcapsules on Phase Transformation and Morphology. The results showed that when n (formaldehyde) / n (melamine)> 4, the agglomeration occurred between the microcapsules and the phase transition temperature of the microcapsules was slightly higher than that of the core paraffin. With the increase of n (formaldehyde) / n (Melamine) increased, the microcapsule phase transition latent heat decreased.