酚醛树脂性能聚合法以硬脂酸
通过原位聚合法以硬脂酸-十八醇低共融复合相变材料(SA-OA,质量比为50.02%,相变温度为55℃)为芯材,三聚氰胺改性的
脲醛树脂(UF)为壁材,氨基化多壁碳纳米管(MWCNTs-NH2)为高导热填料制备了MWCNTs/SA-OA@ UF相变微胶囊。采用FTIR、SEM、DSC、TGA和导热系数仪,对MWCNTs/SA-OA@UF相变微胶囊的化学结构、表面形貌、相变性能和导热性能进行表征。讨论了不同的MWCNTs修饰方法,不同乳化剂种类和MWCNTs添加量对SA-OA@UF相变微胶囊的影响。结果表明:氨基修饰的MWCNTs在溶液中的分散性良好;十二烷基苯磺酸钠(SDBS)和曲拉通X-100复配乳化剂使SA-OA@UF相变微胶囊的表面形貌更加光滑平整;添加质量比为0.5%的MWCNTs,使MWCNTs/SA-OA@UF相变微胶囊的导热系数达到0.224W(m·K),提高了38%(55℃),包覆率提高了6.9%,粒度更加均一,热稳定性有明显提高。
Abstract: The MWCNT/SA-OA@UF phase change microcapsules with stearic acid-octadecyl alcohol eutectic composite phase change materials( SA-OA, at the mass ratio of 50.02%, phase change temperature is 55.38℃) as core material, urea formaldehyde resin ( UF) modified by melamine as wall material and amino multi-walled carbon nanotubes (MWCNTs-NH2) as highly thermally conductive filler were prepared by using in-situ polymerization method. The chemical structure, morphology, thermal properties and thermal conductivity of the MWCNTs/SA-OA@UF phase change microcapsules were characterized by FTIR, SEM, DSC, TGA and thermal conductivity meter. The effects of different MWCNT modification methods, different types of emulsifiers and the amount of MWCNTs added in the SA-OA@UF phase change microcapsules were discussed. The results show that the amino-modified MWCNTs have good dispersibility in the solution; The compounded emulsifiers of sodium dodecyl benzene sulfonate( SDBS) and Triton X-100 make the surface morphology of the SA-OA@UF phase change microcapsules smoother and smoother; The addition of MWCNTs with the mass ratio of 0.5% make the MWCNTs/SA-OA@UF phase change microcapsule's thermal conductivity reach 0.224W (m·K), which increases by 38% (55°C), the coating rate increases by 6.9%, the particle size is more uniform and the thermal stability is significantly improved.
河南派胜祥化工有限公司
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