制备工艺对SA/ATTP复合储热材料结构和性能的影响

以硬脂酸为相变材料,以甘肃临泽工业级凹凸棒石为载体,采用热熔法和溶液浸渍法制备了2种硬脂酸/凹凸棒石复合相变储热材料,采用FTIR、XRD、DSC和SEM等手段进行了结构表征和性能测试。结构分析结果表明制备方法对材料的结构和形貌不会产生影响,2种材料具有相似的形貌和结构,SA分别以38.64%和29.13%的比例以物理作用吸附于ATTP表面。性能分析结果表明热熔法和浸渍法制备的复合储热材料其相变温度峰值分别为57.3℃和55.2℃,相变潜热分别为68.71J/g和51.79J/g,均具有较好的储热能力和化学稳定性,且储热能力和SA在ATTP表面的吸附率成正比,但热循环实验表明浸渍法制备的复合材料的热稳定性较差。结合储热性能、储热稳定性和化学稳定性的研究,证明熔融法更适合于制备建筑智能调温和建筑节能相变复合材料。

Effect of Fabrication Technology on the Performance and Structure of Stearic Acid/Attapulgite Composite Phase Change Materials

Two kinds of stearic acid（SA）/ attapulgite（ATTP） composite phase change materials（PCMs） were prepared for the latent heat thermal energy storage（LHTES） in buildings or other area by the methods of fusion and immersion,using SA as PCMs and ATTP supplied by Linze of Gansu province as supporting material.The structure,thermal properties,thermal reliability and heat storage or release performance of the composite PCMs were determined by scanning electron microscope（SEM）,fourier transformation infrared（FTIR）,differential scanning calorimetry（DSC） and thermal cycling test analysis technique.The results indicate that the preparation method has no effect on the structure and morphologies of the composites.Two kinds of composites have same structure due to the SA adsorbed in the surface of ATTP by physical reaction.The results also show that two form-stable composites PCMs have the optimal effect for preventing SA leak from the composite emerges when the maximum load proportion of SA in the composites were 38.64wt% and 29.13wt%.The latent heats and phase change temperature were measured as 68.71 J/g and 57.3℃ for the composite which was prepared by fusion method and 51.79 J/g and 55.2℃ for the composite fabricated by immersion method,respectively.The results of DSC,FTIR and thermal cycling test are all showing that two kinds of composites have good heat storage property but the composite prepared by fusion method has a better thermal and chemical stability.