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以熔点为29.45℃的复配石蜡为芯材,硬脂酸,司盘-80和OP-10按一定比例混合后为乳化剂,三聚氰胺-尿素-甲醛树脂为壁材,采用原位聚合法制备了碳纳米管/复配石蜡相变微胶囊。试验研究了不同乳化剂对乳液及碳纳米管分散的影响,并用扫描电镜、差示扫描量热仪对石蜡和微胶囊进行了表征。研究结果表明:当添加10%的微晶蜡时,复配石蜡的熔点增大0.73℃,吸热过程相变潜热增加30%;当硬脂酸,司盘80和OP-10的比例为1:2:2时,乳液稳定性和碳纳米管分散性达到最佳,复合乳化剂添加量为芯材质量的5%时,形成的微胶囊形貌良好;碳纳米管的加入,有利于胶囊的成型,能够提高微胶囊的相变潜热。
With the melting point of 29.45 ℃ complex paraffin as the core material, stearic acid, Span-80 and OP-10 mixed by a certain percentage as emulsifier, melamine - urea - formaldehyde resin as the wall material, prepared by in situ polymerization Carbon nanotubes / paraffin phase-change microcapsules. The effects of different emulsifiers on the dispersions of emulsions and carbon nanotubes were investigated. Paraffin and microcapsules were characterized by scanning electron microscopy and differential scanning calorimetry. The results show that when 10% microcrystalline wax is added, the melting point of complex paraffin increases by 0.73 ℃ and the latent heat of the endothermic process increases by 30%. When the ratio of stearic acid, Span 80 and OP-10 is 1 : 2: 2, the emulsion stability and the dispersion of carbon nanotubes reached the best. When the amount of the composite emulsifier was 5% of the core material, the morphology of the microcapsules was good. The addition of carbon nanotubes favored the encapsulation of capsules The formation of microcapsules can improve the phase transition latent heat.