石蜡相变微胶囊的制备及性能研究

摘 要：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。采用傅里叶红外光谱仪（FT-IR）、扫描电子显微镜（SEM）、激光粒度分析仪和差示扫描量热仪(DSC)对微胶囊的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（F/M）对微胶囊性能和形貌的影响。实验结果表明，F/M摩尔比大于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F/M摩尔比增加，微胶囊的相变潜热降低。

Preparation and Characteristics of Paraffin Microcapsules

Abstract: Microcapsules containing paraffin were prepared through the in-situ polymerization method using melamine-formaldehyde as wall material. The properties and morphology of the microcapsules were characterized by Fourier-transform infrared spectra (FT-IR), Scanning electronic microscope (SEM), Laser particle size analyzer and Differential scanning calorimeter (DSC). The effects of the molar ratio of formaldehyde to melamine (F/M) on morphology and properties of microencapsulated paraffin were investigated. The results showed that when the ratio of F/M was higher than 4, high degree of cross-linking melamine-formaldehyde resin was obtained and the visible agglomeration of the microcapsules was observed. The phase-transforming point of microcapsules was higher than paraffin, the latent heat of microcapsules decreased as the F/M molar ratio increased.