三聚氰胺-脲素-甲醛@石蜡微胶囊相变材料的制备及其性能研究

Preparation and properties research of melamine-urea-formaldehyde@paraffin phase change materials

采用石蜡为芯材,三聚氰胺-脲素-甲醛树脂为壁材,利用原位聚合法制备相变储能材料,研究了氧化石墨烯、十二烷基硫酸钠、司盘80、吐温80作为石蜡乳化剂对合成微胶囊相变材料(MicroPCMs)化学结构、粒径分布、热性能和微观形貌的影响。结果表明,三聚氰胺-脲素-甲醛树脂壁材可对石蜡芯材进行有效包覆,形成微胶囊结构的复合相变材料;不同乳化剂对MicroPCMs的粒径分布有明显影响,以氧化石墨烯作为乳化剂时,微胶囊颗粒呈现较为规则的球形,粒径在3~20μm,具有较高的相变潜热,相变材料包覆率为39.80%;在热分解过程中,微胶囊核壳结构起到了热阻作用,增大了石蜡芯材的热分解温度范围,提高了MicroPCMs的热稳定性能。

Microencapsulated phase change materials(MicroPCMs) with paraffin as core and melamine-urea-formaldehyde(MUF) as shell materials were synthesized by in situ polymerization method.The chemical structure,particle size distribution,thermal performance and micro-morphology of the microcapsules that used Graphene oxide,Sodium dodecyl sulfate,Span80 and Tween80 as emulsifier were investigated.The results indicated that melamine-urea-formaldehyde(MUF) shell is effectively encapsulated on the surface of the paraffin core material to form composite phase change materials of microcapsule structure.Emulsifier has an obvious effect on the particle size distribution of MicroPCMs.When GO were used as emulsifier,the particle size distribution of the MicroPCMs is in the range of 3~20 μm,the MicroPCMs showed a regular sphere shape with a encapsulation ratio of 39.8%.As the thermal resistance effect of the MUF shell materials,the thermal decomposition temperature range of the paraffin core material and the thermal stability of microcapsules are improved.