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以石蜡(PA)为相变材料,膨胀珍珠岩(EP)为载质,利用直接吸附法制备出PA/EP复合相变材料。通过红外光谱、扫描电镜、差示扫描量热仪和热重分析仪对复合相变材料的微观结构、相变温度、相变潜热和热稳定性进行表征。结果表明:PA能较好的吸附在EP孔隙内,当复合相变材料中PA质量分数为66.6%时,其吸附量已达到饱和值,起始相变温度为57.1℃,相变潜热为133J/g,热稳定性最优。PA与EP之间的结合未发生化学反应,PA的热性能没有改变。复合相变材料在调控大体积混凝土及磷酸镁水泥水化热领域有着很大的应用潜力。
PA / EP composite phase change material was prepared by direct adsorption using paraffin (PA) as phase change material and expanded perlite (EP) as carrier. The microstructure, phase transition temperature, latent heat of transformation and thermal stability of composite phase change material were characterized by infrared spectroscopy, scanning electron microscopy, differential scanning calorimeter and thermogravimetric analyzer. The results show that PA can adsorb well in the pores of EP. When the mass fraction of PA in composite phase change material is 66.6%, the adsorption amount has reached the saturation value, the initial transformation temperature is 57.1 ℃ and the latent heat of transformation is 133J / g, the best thermal stability. There was no chemical reaction between the binding of PA and EP, and the thermal properties of PA did not change. Composite phase change materials in the regulation of mass concrete and magnesium phosphate cement hydration has great potential applications.