硬脂酸/活化凹凸棒石复合相变储热材料的制备与表征  

Preparation and characterization of stearic acid/activated attapulgite composite phase change materials

作　　者：王毅[1,2] 郑翰[1] 冯辉霞[1] 夏天东[2] 

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《现代化工》2011年第2期43-46,共4页Modern Chemical Industry

基　　金：国家自然科学基金(51063003);兰州理工大学优秀青年基金(Q200812)

摘　　要：以热活化的甘肃临泽凹凸棒石为基体,采用热熔法和浸渍法制备了硬脂酸/活化凹凸棒石复合相变储热材料。利用红外光谱仪(FTIR)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)等方法表征了复合材料的结构,采用示差量热扫描仪(DSC)和储放热实验考察了复合材料的储/放性能和稳定性。结果表明采用热熔法和溶液浸渍法制备的材料具有相同的结构,硬脂酸按38.5%的负载率以物理作用吸附于活化凹凸棒石表面,其相应的相变焓分别为68.44 J/g和69.06 J/g。稳定性实验表明2种材料均具有良好的化学稳定性,但热稳定性存在差异,热熔法制备的复合材料的热稳定性优于浸渍法制备的复合材料。The stearic acid （SA）/activated attapulgite（a-ATP） composite materials are prepared by the method of heat fusion and solution infusion process using SA as the phase change materials（PCMs） and attapulgite（ATP） as the matrix which is provided by Linze of Gansu province and activated by thermal treatment. The structure is determined by Fourier transformation infrared （ FTR）, X-ray diffraction （XRD） and scanning electron microscope （ SEM ）. The thermal performance is evaluated by differential scanning calorimetry（DSC） and the stability of materials is evaluated by thermal cycling test. The results demonstrate two kinds of PCMs possess the same structure due to SA absorbed in the surface of a-ATP with physical action. The results also show that the two form-stable composites PCMs having the optimal effect for preventing the leakage of PCMs from the composite emerge when the maximum load proportion of SA in the composites is 38. 5% and the latent heats are measured as 68. 44 J/g and 69. 06 J/g for the composite which is made by the method of heat fusion and solution infusion process, respectively. The performance testing demonstrates two materials＇ chemical stability are good, but their thermal stability is different, the material prepared by heat fusion is provided with better thermal stability than the other one.

关 键 词：硬脂酸 活化凹凸棒土 相变材料 储热 

分 类 号：TB34[一般工业技术—材料科学与工程]