石蜡-正辛酸/石墨相变材料的制备及热物性分析  

Preparation and Thermophysical Analysis of Paraffin-Octanoic Acid/Graphite Phase Change Materials

作　　者：周璐 付志强[1] 张蕾[1] 赵星星 郭凯雯 ZHOU Lu;FU Zhi-qiang;ZHANG Lei;ZHAO Xing-xing;GUO Kai-wen(School of Light Industry Science and Engineering,Tianjin University of Science and Technology,Tianjin 300222,China)

机构地区：[1]天津科技大学轻工科学与工程学院,天津300222

出　　处：《包装工程》2021年第17期150-154,共5页Packaging Engineering

基　　金：天津市教委科研计划(自然科学)(2019KJ209)。

摘　　要：目的为了减少产品在运输过程中由于温度而造成的损坏,研发一种石蜡-正辛酸/石墨相变材料,并探究其性能。方法主要通过热物性实验,包括差示扫描量热、TEMPOS热特性来分析石蜡-正辛酸/石墨相变材料的性能。结果配置了6种不同质量比的石蜡和正辛酸,质量比为0.2∶0.8的石蜡-正辛酸达到共晶点,相变潜能为161.31 J/g,相变温度为13.4℃;以质量比0.2∶0.8的石蜡-正辛酸为原料,添加不同添加量的石墨来提高导热性能,发现当石墨质量分数为20%时,导热系数提高了3.9倍,且循环稳定性好。结论从相变潜能、相变温度和导热系数等3个方面考虑,当质量分数为20%的石墨添加在质量比为0.2∶0.8的石蜡-正辛酸相变材料中,可得最佳石蜡-正辛酸/石墨相变材料,满足10~20℃运输环境的要求。In order to reduce the damage caused by temperature during the transportation of the products,the paraf-fin-octanoic acid/graphite phase change material was prepared and its properties were investigated.Its performance was analyzed through thermophysical experiments,including differential scanning calorimetry and TEMPOS thermal charac-teristics,were used to analyze its performance.Six kinds of paraffin and octanoic acid with different mass ratios were prepared.The paraffin-n-octanoic acid with a mass ratio of 0.2∶0.8 reached the eutectic point,with a phase transition potential of 161.31 J/g and a phase transition temperature of 13.4℃.The thermal conductivity of paraffin-octanoic acid with a mass ratio of 0.2∶0.8 was improved by adding different contents of graphite.It was found that the thermal con-ductivity increased by 3.9 times and cycle stability became good when the graphite content was 20%.Considering three aspects such as phase transition potential,phase transition temperature and thermal conductivity,the conclusion is that the best paraffin-octanoic acid/graphite phase change material can be obtained by adding 20%graphite to the paraf-fin-octanoic acid/graphite phase change material with a mass ratio of 0.2∶0.8,which can meet the requirements of transportation environment of 10-20℃.

关 键 词：石蜡-正辛酸/石墨 相变潜能 相变温度 导热系数 

分 类 号：TS205.7[轻工技术与工程—食品科学]