十四烷微胶囊的制备及性能研究

Synthesis and thermal properties of tetradecane phase change microcapsules

为解决低温相变材料稳定性不好和易泄露等问题,采用原位聚合法制备了一系列以十四烷为芯材,脲醛树脂为壁材的低温相变微胶囊。探究了乳化剂种类、HLB值、预聚体水量和初始pH值等因素对微胶囊制备的影响,采用SEM、FT-IR、DSC和马尔文激光粒度仪对微胶囊的形貌、化学构成、热力学性质和粒径进行测试分析。实验结果表明,以Span80-Tween80复配乳化剂制备得到的微胶囊,形貌光滑且呈球形,粒径分布均匀,相变温度为3.05℃,相变潜热达到60 J/g,平均粒径为8.4μm。芯材和壁材仅为简单的物理嵌合,具有良好的储热性能和热稳定性。

In order to solve the problems of poor stability and leakage of low-temperature phase change materials,low-temperature phase change microcapsules with tetradecane as the core material and urea-formaldehyde as the shell material are synthesized by in-situ polymerization.The influence of emulsifier,HLB value,prepolymer water volume and initial pH value on the preparation of microcapsules are investigated.SEM,FT-IR,DSC and Malvern laser particle size analyzer are used to test and analyze the morphology,chemical composition,thermodynamic properties and particle size of the microcapsules.The experimental results show that the microcapsules prepared with span80-tween80 compound emulsifier have smooth surface,spherical morphology and uniform particle size distribution.The phase change temperature of the microcapsules is 3.05℃.The latent heat of phase transition microcapsules reaches 60 J/g,and its average particle size is 8.4μm.The core material and the wall material are only a simple physical fit,which has good heat storage performance and thermal stability.