定形相变材料及其石膏基储能建筑材料的研究

Study on form-stable PCMs and its gypsum-based energy storage building materials

以月桂酸-肉豆蔻酸-棕榈酸三元低共熔脂肪酸(LA-MA-PA)为相变芯材,硅藻土为担载材料,基于真空吸附法制备了不同质量比的LA-MA-PA/硅藻土定形相变材料并确定了最佳配比。采用SEM、FT-IR、DSC对该定形相变材料的微观形貌、结构和热性能进行表征分析。将其与建筑石膏结合制备石膏基储能建筑材料,并对其调温功能和相变过程中脂肪酸的渗漏情况进行评价。蓄放热试验表明,含15%定形相变材料的石膏基储能建筑材料的温度波动明显小于普通石膏建筑材料,两者温度最高点和最低点的差值为4.9℃。此外,对石膏基储能建筑材料进行热处理后并没有造成其中脂肪酸的明显渗漏情况。

Lauric acid-myristic acid-palmitic acid eutectic mixture （LA-MA-PA） is firstly prepared. Diatomite is then used as carrier material to synthesize LA-MA-PA/diatomite form-stable PCMs with suitable mass ratio by vacuum absorption method. The morphology, structure and thermal properties of the form-stable PCMs are characterized by SEM, FT-IR and DSC. LA-MA-PA/diatomite form-stable PCMs are added to gypsum to prepare gypsum-based energy storage construction materials. The temperature adjustment performance and leakage condition are evaluated. The results of exothermic-endothermic tests show that there is a more distinct temperature fluctuation in normal gypsum building materials than that in thermal storage gypsum building materials. The difference in temperature spike is 4. 9℃. In addition, heat treatment for 2 hours does not result in the leakage of fatty acids.