二元有机/煤系高岭土复合相变储能材料的制备及其热性能

摘要

采用熔融插层技术,以二甲基亚砜(DMSO)改性的煤系高岭土为前驱体,将月桂酸(LA)和月桂醇(LAL)作为相变材料插入高岭土(Kaolin)层间,制备二元有机/煤系高岭土复合相变储能材料.采用XRD、FTIR、DSC等现代测试技术对复合材料的热性能与内层结构进行了研究.结果表明LA-LAL/kaolin复合物相变温度为25.1℃,相变焓为45.24J/g；复合相变材料是煤系高岭土和月桂酸/月桂醇二元体系的物理共混物,没有新的键合生成；热稳定性实验表明,煤系高岭土对月桂酸/月桂醇二元低共熔相变材料具有良好的定形效果.%Binary organic/Kaolin composite as a phase change materials (PCMs) was prepared by melt intercalation method, in which Kaolin/dimethyl sulphoxide was used as intercalation precursor, lauric acid (LA) and lauryl alcohol(LAL) as phase change materials were inserted into kaolinite interlayers. The thermal properties and structure of the composite material were characterized with XRD, FT-IR and DSC. The melting temperature and the latent heat of the LA-LAL/kaolin composite PCMs were determined to be 25. 1℃ and 45. 24 J/g, respectively, by DSC analysis. There is no chemical reaction between kaolinite and LA/LAL eutectic mixture. Thermal stability experiments show that kaolinite has a good shaping effect on the binary eutectic phase change material of LA/LAL.