硬脂酸/插层高岭石复合相变材料的制备和热性能研究

Preparation and Thermal Properties of Stearic Acid/Intercalated Kaolinite Composite Phase Change Material

高岭石(K)是一种常见的黏土矿物,具有低成本、阻燃、多层结构等固有优点。本文采用真空浸渍法将硬脂酸(SA)吸附到插层高岭石(IKL)和二甲基亚砜(DMSO)复合物的孔隙中来制备用于储热的复合相变材料。通过X射线衍射(XRD)、红外光谱(FT-IR)、热重分析(TG)、差示扫描量热法(DSC)、扫描电子显微镜(SEM)和比表面积分析仪(BET)表征了复合材料的热性能、结构和主要组分。由于插层复合物形成后高岭石层间距增大,对SA的吸附率达到32.3%,熔化和凝固潜热值分别为43.36 J/g和43.16 J/g,熔化和凝固温度分别为51.9℃和51.7℃。此外,该复合相变材料具有较好的热稳定性。由于SA/IKL复合相变材料具有高吸附量、高潜热、良好的热稳定和低成本等优点,因此,其在实际的应用中具有潜在的价值。

Kaolinite(K)is a common clay mineral with inherent advantages such as low cost,flame retardant,and multilayer structure.In this paper,a vacuum impregnation method was used to adsorb stearic acid(SA)into dimethyl sulfoxide(DMSO)and intercalated kaolinite(IKL)pores to prepare a composite phase change material for heat storage.Thermal properties,structure and composition of the prepared composite were tested by X-ray diffraction(XRD),fourier transform infrared spectroscopy(FT-IR),thermal gravimetric(TG),differential scanning calorimety(DSC),scanning electron microscope(SEM),and Brunauer-Emmet-Tellerare(BET).The mass ratio of SA adsorbed into IKL without leakage is as high as 32.3%,ascribed to the expansion of kaolinite interlayer.The latent heat of melting and freezing is 43.36 J/g and 43.16 J/g,and the melting and freezing temperatures is 51.9℃and 51.7℃.In addition,the composite phase change material has excellent thermal stability.Due to the high adsorption capacity,high latent heat,good thermal stability,as well as low cost,SA/IKL composite phase change material has potential application value in practical applications.