界面聚合法包覆石蜡制备微胶囊复合相变材料

Preparation of Micro-capsule Phase Change Composite Material by Coating Paraffin with Interfacial Polymerization

石蜡作为相变材料在储能领域已成为研究热点,其中一个重要问题就是石蜡的封装。以微胶囊包覆的方式对石蜡进行封装,通过界面聚合,以甲基丙烯酸甲酯聚合包覆石蜡微乳液,得到聚甲基丙烯酸甲酯包覆石蜡的核壳结构。研究了复合相变材料的包覆过程中转速、乳化剂的添加量、引发剂的添加量及包覆温度对微胶囊颗粒大小及性能的影响,并提出了微胶囊包覆过程中的"尺寸含量关系",预测了实验平衡点。当转速为2000r/min、乳化剂添加量为4%、引发剂添加量为1%、聚合温度为70℃时,得到粒径为1μm左右的微胶囊,材料的相变储能约为110J/g,石蜡的包覆率为50%。

Paraffin phase change material has become a research focus in the energy storage field. The encapsulation of paraffin is one of the key techniques for the application purpose. The paraffin is encapsulated through interfacial polymerization, using methyl methacrylate （MMA） as the coating material. The core-shell structured micro-capsule is prepared with poly-methylmethacrylate coating the paraffin. The parameters affecting the coating process is investigated, including the mechanical rotation speed, addition amounts of the emulsifier and initiator and coating temperature. The size-content relation of coating process is given, which is used to forecast the experimental balance point. When the rotation speed is 2000r/min, the addition amounts of emulsifier and initiator are 4%, and 1% respectively, with the coating temperature at 70℃, the optimized result is obtained. The diameter of the micro-capsule prepared under the above conditions is about 1μm. Its phase change enthalpy is about 110J/g and the coating rate of the paraffin reaches 50%.