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采用原位聚合法制备了以脲醛树脂为壁材的微胶囊相变材料,利用FTIR分析了微胶囊的化学结构,采用SEM对脲醛树脂预聚体溶液的滴加速度对微胶囊表观形貌的影响进行了分析,并采用DSC对不同芯壁比对微胶囊的包封率进行了比较.实验结果表明,随着预聚体滴加速度的减慢,微胶囊表面凝聚现象减少,球面光滑度增加;微胶囊的包封率和相变潜热随芯壁比的增加而增加;当芯壁比达到2时,微胶囊的包封率和相变潜热开始下降.
The in-situ polymerization was used to prepare the microcapsule phase change material with urea-formaldehyde resin as the wall material. The chemical structure of the microcapsules was analyzed by FTIR. The effects of the dropping rate of urea-formaldehyde resin prepolymer solution on the morphology of microcapsules , The entrapment efficiency of microcapsules with different ratio of core to wall was compared by DSC.Experimental results show that with the decrease of prepolymer dropping rate, the surface coalescence of microcapsules is reduced and the spherical smoothness is increased The encapsulation efficiency and latent heat of microcapsules increased with the increase of core-wall ratio. When the core-wall ratio reached 2, the entrapment efficiency and latent heat of microcapsules began to decrease.