脂肪酸多元低共熔物的共晶质量比例、储热性能及其应用

摘要

Five fatty acids,including capric acid (CA),laurie acid (LA),myristic acid (MA),palmitic acid (PA),and stearic acid (SA) were selected as raw materials.Eutectic phase diagrams of binary fatty acid eutectics (CA-LA and CA-MA),ternary fatty acid eutectics (CA-LA-PA,CA-LA-SA,CA-MA-PA and CA-MA-SA) and quaternary fatty acid eutectics (CA-LA-PA-SA and CA-MA-PA-SA) were analyzed by Schrader equation and MATLAB software.The eutectic mass ratios of the above eight fatty acid eutectics were also determined.Thermal energy storage and release properties of multiple fatty acid eutectics were tested by DSC analysis.Results showed that the phase change temperatures of multiple fatty acid eutectics are significantly lower than those of pure fatty acids,and gradually decrease with the increase of the number of components in the mixture.Melting temperatures and melting enthalpies of multiple fatty acid eutectics are about 15-31℃ and 127-155kJ/kg,respectively.%以单一脂肪酸癸酸(CA)、月桂酸(LA)、肉豆蔻酸(MA)、棕榈酸(PA)和硬脂酸(SA)为原料,使用Schrader公式和MATLAB软件分析了脂肪酸二元低共熔物(CA-LA和CA-MA)、三元低共熔物(CA-LA-PA、CA-LA-SA、CA-MA-PA和CA-MA-SA)和四元低共熔物(CA-LA-PA-SA和CA-MA-PA-SA)的共晶相图.确定了以上8种脂肪酸低共熔物的共晶质量比例.采用差热扫描仪(DSC)测试了脂肪酸多元低共熔物的储热性能,测试结果表明:脂肪酸低共熔物的相变温度明显低于脂肪酸的相变温度,且随着低共熔物中组分的增加而降低.制备出的脂肪酸低共熔物的融化温度和融化焓值分别为15～31℃和127～155kJ/kg.