相变蓄热材料微胶囊制备工艺的正交试验分析

ORTHOGONAL TEST ANALYSIS OF MICROCAPSULES PREPARED FOR THE PHASE CHANGE HEAT STORAGE MATERIAL

以常低温相变蓄热材料作为芯材,脲醛树脂作为壳材,通过原位聚合法合成了常低温相变蓄热材料微胶囊。采用正交试验优化,确定了微胶囊的最佳制备工艺。利用SEM分析了乳化剂的种类对微胶囊微观形貌的影响,并结合FTTR和DSC等测试仪器考察了通过最佳制备工艺得到的微胶囊化学结构及热性能。实验结果表明:在乳化转速为3000r/min下使用由吐温60和司盘60组成的混合型乳化剂,用量为芯材质量5%,所制备的微胶囊具有良好的热稳定性、球体表面光滑、粒径均一。在吸热过程中,相变温度为30.10℃,相变潜热为63.85J/g。

The microcapsules for phase change heat storage material were prepared by in-situ polymerization with urea-formaldehyde resin as shell and low melting point phase change heat storage material RT31 as core. Orthogonal test was used to optimize the preparation process of microcapsules for phase change heat storage material. The effects of the emulsifier sort on the properties of microcapsules were analyzed by SEM. In addition, FIRT and DSC were used to investigate the chemical structure and thermal properties of the microcapsules prepared by the optimal process. The results showed that the microcapsules prepared at the rotation speed of 3000 r/min with 5% compound emulsifier which was composed of Tween-60 and Span-60 had excellent thermal stability, uniform particle size distribution and smooth surface. The phase change temperature and latent heat storage capacity of the microcapsules were 30.10°C and 63.85 J/g, respectively.