脂肪酸相变材料的封装制备及热工性质

Packaging Preparation and Thermal Properties of Fatty Acid Phase Change Materials

本研究旨在解决能源供需在时间、空间和强度上的不匹配问题,以及单一相变材料存在的不足。采用原位聚合法制备了以月桂酸-肉豆蔻酸-棕榈酸-硬脂酸(LA-MA-PA-SA)四元低共熔脂肪酸为芯材,三聚氰胺改性酚醛树脂为壁材的复合相变微胶囊。通过扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、傅里叶变换红外光谱仪(FT-IR)及热重分析仪(TG)对微胶囊进行表征。结果表明:当酚醛树脂预聚体合成的pH值为8~9、乳化剂为Span 60与Tween 60以质量比3∶7复合而成、胶囊化过程中搅拌速度为600 r/min及芯材与壁材质量比为1.37∶1时,所制备的微胶囊表面光滑、粒径分布均匀、包裹率较高,其相变温度和熔融潜热分别为32.93℃和87.67 J/g。微胶囊的芯材与壁材仅为简单的物理嵌合,且经过50次冷热循坏后,具有良好的储热性能和热稳定性。

This work aimed to solve the problem of mismatch between energy supply and demand in time,place and strength,as well as the shortages of single phase change materials.Composite phase change microcapsules(MPCMs)with LA-MA-PA-SA quaternary eutectic fatty acid as core material and melamine modified phenolic resin as shell material were prepared by in-situ polymerization.The MPCMs were characterized by scanning electron microscopy(SEM),differential scanning calorimetry(DSC),Fourier transformed infrared spectroscopy(FT-IR)and thermogravimetric analysis(TG).The results showed that when the value of pH was between 8 and 9,the emulsifier was Span 60∶Tween 60=3∶7(mass ratio),the stirring speed in the process of encapsulation was 600 r/min,the core/shell mass ratio was 1.37∶1,the best MPCMs were obtained with smooth surface,uniform particle size distribution,higher covering rate,the phase change temperature and melting latent heat of 32.93℃and 87.67 J/g respectively.There was only simple physical chimeric between core material and shell material of the MPCMs.After 50 times of cold and hot cycling,MPCMs had good heat storage thermal performance and good thermal stability.