以月桂酸(LA)、棕榈酸(PA)和石蜡(PS)为原料制备了LA-PA-PS三元共晶相变材料,通过真空吸附法将LA-PA-PS吸附至膨胀石墨(EG)中得到三元定形复合相变材料(CPCM),并对其进行泄露实验和性能表征。结果表明:当EG对LA-PA-PS的吸附率为90.91%时,该相变材料的泄漏率小于1%;LA-PA-PS与EG之间是通过物理作用结合,并未发生化学反应;CPCM的熔化与凝固温度分别为33.81℃与27.83℃,熔化与凝固潜热分别为150.64J/g与131.41J/g,且具有优异的热循环稳定性;CPCM在温度不高于100℃时不发生分解,具有较好的热稳定性。由于CPCM具有适宜的相变温度、较高的相变潜热和较好的热稳定性,因此,在建筑节能领域具有较好的应用价值。
In this study,a ternary eutectic phase change material LA-PA-PS was prepared from lauric acid (LA),palmitic acid (PA) and paraffin wax (PS).This LA-PA-PS was adsorbed into expanded graphite (EG) by vacuum adsorption method to obtain a ternary conformal composite phase change material (CPCM),and leakage experiments and performance characterization were carried out.The results showed that the leakage rate of the phase change material was less than 1% when the EG adsorption ratio on LA-PA-PS was 90.91%.The LA-PA-PS and expanded graphite were combined by physical effect rather than chemical reaction.The melting and solidification temperatures of CPCM were 33.81℃ and 27.83℃,the melting and solidification latent heats of CPCM were 150.64J/g and 131.41J/g,respectively,with good thermal cycling stability.The CPCM would not decompose when the ambient temperature was not more than 100℃,demonstrating excellent thermal stability.Due to its excellent characteristics such as appropriate phase transition temperature,high latent heat of phase change,and good thermal stability,the CPCM has significant application value in the field of building energy conservation.
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基金资助
国家自然科学基金(51966004);江西省自然科学基金项目(20212BAB204029);江西理工大学清江青年优秀人才项目(JXUSTQJYX2017003)
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