通过原位聚合法合成了以高温相变石蜡(相变区间为75~85℃)为芯材，三聚氰胺改性脲醛树脂为壁材的相变微胶囊。采用DSC、SEM、导热系数仪等分别对石蜡-脲醛树脂(Paraffin-UF)微胶囊的形貌、热性能等进行了表征。分析了 NaCl溶液、三聚氰胺以及石墨烯的添加对微胶囊的影响。结果表明：适量 NaCl 的添加能改善微胶囊表面形貌，三聚氰胺的添加能提高微胶囊的生成量。添加质量分数为0.03%的石墨烯，在80℃时微胶囊的导热系数提高了55.56%，而且其热稳定性有所提高。
The microcapsules containing high temperature phase change paraffin (Phase change interval is 75 85 ℃)was prepared by in situ polymerization using melamine modified urea-formaldehyde resin as wall material. Morphology,thermal properties of paraffin urea-formaldehyde (Paraffin-UF)microcapsules were characterized and analyzed by DSC,SEM,the coefficient of thermal conductivity meter.The influence of the NaCl solution,melamine and graphene for microcapsules was analyzed.The results show that the NaCl addition can improve the microcapsule surface morphology,and the addition of melamine can improve the production of microcapsules.While adding 0.03wt% mass fraction of graphene at 80 ℃,the coefficient of thermal conductivity of microcapsules is increased by 5 5.5 6%,and its thermal stability is improved.
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