基于ZnO为壁材的相变微胶囊的制备及表征

Preparation and characterization of phase change microcapsules with zinc oxide as wall material

采用石蜡为芯材、自制ZnO为壁材,通过化学沉淀法制备石蜡/ZnO微胶囊相变储能材料,探究了石蜡质量对微胶囊热性能的影响,并通过FT-IR、XRD、SEM、DSC及TGA对复合相变材料的结构和性能进行表征。结果表明,微胶囊化过程中石蜡和ZnO的化学结构和晶型结构没有改变;球形结构的微胶囊可以有效防止石蜡的泄露,但其表面粗糙且存在黏连现象;石蜡的微胶囊化可以改善石蜡的热稳定性和耐久性;当石蜡质量为10 g时,微胶囊的包覆率和包覆效率最高分别为41.36%、41.47%。泄漏测试结果表明,石蜡成功被ZnO包覆,但是仍然存在泄漏情况。

Paraffin/Zn O microcapsule phase change energy storage materials are prepared through chemical precipitation method by using paraffin as core material and self-made Zn O as wall material.The influence of different paraffin contents on the thermal performance of microcapsule is investigated.Meanwhile,the structure and properties of the composite phase change materials are characterized by means of FT-IR,XRD,SEM,DSC and TGA.The results show that the chemical structure and crystal structure of paraffin and Zn O remain unchanged during microencapsulation.SEM image shows that the microcapsule with a spherical structure can effectively prevent the leakage of paraffin,but its surface is rough and there exists adhesion phenomenon.The results by DSC and TGA show that the microencapsulation of paraffin can improve the thermal stability and durability of paraffin.As the content of paraffin is 10 g,the highest encapsulation ratio and efficiency of microcapsule reach 41.36 and 41.47%,respectively.The leakage test results show that paraffin has successfully been encapsulated by Zn O,but there is still leakage.