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以癸酸(CA)、棕榈酸(PA)和硬脂酸(SA)为原料,通过超声法制备了三元脂肪酸复合相变材料。由二元相图确定CA-PA的二元配比,由三元相图确定CA-PA-SA的三元配比,由DSC和FT-IR测试其化学性质和热性能。FTIR表明共混复合相变材料中3种脂肪酸是通过分子间作用力结合在一起;DSC表明共混复合相变材料的相变温度为25.59℃、相变焓176.98J·g-1,由二元和三元相图可以看出,相变温度都是先降低后升高,表现出低共熔物特征;通过500次热循环测试,作为相变材料脂肪酸三元低共熔物具有良好的热稳定性和化学稳定性。根据上面的结论得出CAPA-SA复合相变材料有合适的相变温度和相变潜热,适合做蓄热低温材料。
Ternary fatty acid composite phase change material was prepared by ultrasonic method using capric acid (CA), palmitic acid (PA) and stearic acid (SA) as raw materials. The dibasic ratio of CA-PA was determined by binary phase diagram. The ternary phase ratio of CA-PA-SA was determined by ternary phase diagram. The chemical and thermal properties of CA-PA-SA were tested by DSC and FT-IR. FTIR showed that the three kinds of fatty acids in the composite phase change material were bound together by intermolecular force. DSC showed that the phase transition temperature of the composite phase change material was 25.59 ℃ and the enthalpy of phase transformation was 176.98 J · g -1, It can be seen from the elemental and ternary phase diagrams that the phase transition temperature first decreases and then increases, indicating the characteristics of the eutectic. After 500 thermal cycling tests, the fatty acid ternary eutectic as the phase change material has good Thermal and chemical stability. According to the above conclusion, it is concluded that the phase change material and the phase change latent heat of CAPA-SA composite phase change material are suitable for low temperature storage materials.