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以亲水型纳米SiO2粒子改性的三聚氰胺-甲醛树脂作为微胶囊壁材,以相变材料正十二醇为芯材,采用原位聚合法,制备了纳米SiO2改性的相变储热微胶囊,研究了纳米SiO2粒子对微胶囊性能的影响,采用FTIR、DSC和SEM等方法进行了表征。结果表明,当壁材中加入适量的纳米SiO2时,纳米粒子在壁材里面分布均匀,微胶囊的相变焓提高,破损率降低,且纳米SiO2不会破坏预聚体的缩聚反应。当壁材中纳米SiO2质量分数为1%时,制备的微胶囊相变焓达148.7J/g,微胶囊破损率为23.1%。
Nano-SiO2 modified melamine-formaldehyde resin was used as the microcapsule wall material. The phase change material n-dodecanol was used as the core material. The effects of nano-SiO2 particles on the properties of microcapsules were studied. The properties of the microcapsules were characterized by FTIR, DSC and SEM. The results showed that when the appropriate amount of nano-SiO2 was added to the wall material, the nano-particles distributed uniformly in the wall material, the enthalpy of phase transition of the micro-capsules increased, the damage rate decreased, and the nano-SiO2 did not destroy the polycondensation reaction of the prepolymer. When the mass fraction of nano-SiO2 in the wall material is 1%, the enthalpy of phase transition of the prepared microcapsule reaches 148.7 J / g, and the microcapsule damage rate is 23.1%.