硬脂酸/插层高岭石复合相变材料的制备和热性能研究

摘要/Abstract

摘要： 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。

关键词: 高岭石, 硬脂酸, 真空浸渍法, 储热, 潜热, 相变材料

Abstract: 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.

Key words: kaolinite, stearic acid, vacuum impregnation method, heat storage, latent heat, phase change material

中图分类号:

TB34

张蒙, 赵炳新, 王娟, 程宏飞. 硬脂酸/插层高岭石复合相变材料的制备和热性能研究[J]. 人工晶体学报, 2020, 49(12): 2365-2370.

ZHANG Meng, ZHAO Bingxin, WANG Juan, CHENG Hongfei. Preparation and Thermal Properties of Stearic Acid/Intercalated Kaolinite Composite Phase Change Material[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2020, 49(12): 2365-2370.

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