石蜡基高热导率相变储能材料的制备  

Preparation of Paraffin-based High Thermal Conductivity Phase Change Energy Storage Materials

作　　者：王若钰 梁斌[1,2] 朱英明 鲁厚芳 吴可荆[1,2] WANG Ruo-yu;LIANG Bin;ZHU Ying-ming;LU Hou-fang;WU Ke-jing(School of Chemical Engineering,Sichuan University,Chengdu 610207,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610207,China)

机构地区：[1]四川大学化学工程学院,四川成都610207 [2]四川大学新能源与低碳技术研究院,四川成都610207

出　　处：《化学试剂》2023年第1期108-113,共6页Chemical Reagents

摘　　要：针对相变蓄能材料的相变点调节和热导率增强的问题,通过熔融混合法制备了一种低相变温度、高潜热的C14~C18石蜡基共熔相变材料,通过DSC和塔曼图对C14~C18混合物进行了分析,确定了共熔物的组成为84.4 wt%C14~15.6 wt%C18,熔点和相变焓分别为1.0℃和205 kJ/kg。基于C14~C18石蜡共熔物作为相变储能材料,以5种不同压缩密度的膨胀石墨作为吸附基质,制备了C14~C18/EG复合材料。通过SEM、FT-IR、XRD表征了微观结构和形貌,通过DSC和HOT-DISK热常数分析仪测试了储能性能和导热性能,并探讨了不同压缩密度的膨胀石墨与复合材料的相变焓以及热导率的关系。实验结果表明:在实验条件范围内,相变焓与压缩密度成正比,热导率与压缩密度成反比;在100次吸放热试验后,样品形貌和热性质未发生变化,复合材料具有良好的循环稳定性和热稳定性。复合相变储能材料在低温储存领域具有应用潜力。Aiming at the problems of phase change point adjustment and thermal conductivity enhancement of phase change energy storage materials,a kind of C14~C18 paraffin-based eutectic phase change material with low phase transition temperature and high latent heat was fabricated by melt mixing method.The C14~C18 mixture was analyzed by DSC and Taman diagrams,and the composition of the eutectic was determined to between 84.4 wt%C14 and 15.6 wt%C18,and the melting point and phase change enthalpy were 1.0℃and 205 kJ/kg,respectively.C14~C18/EG composites were prepared based on C14~C18 paraffin eutectic as phase change energy storage material and five kinds of expanded graphite with different compression densities as adsorption matrix.The microstructures and morphologies were characterized by SEM,FT-IR and XRD,while DSC and HOT-DISK thermal constant analyzer were used to evaluate the energy storage performance and thermal conductivity of the composites.Moreover,the relationship between expanded graphite with different compression densities and the phase change enthalpy and thermal conductivity of the composites was discussed.The experimental results indicated that within the range of the experimental conditions,the phase change enthalpy was proportional to the compressive density,while the thermal conductivity was inversely proportional to it.After 100 endothermic and exothermic tests,the sample morphology and thermal properties had not changed,evidencing good cycling and thermal stability of the composite material.Composite phase change energy storage materials have potential applications in the field of low temperature storage.

关 键 词：石蜡共熔物 相变储能材料 膨胀石墨 热导率 稳定性 

分 类 号：O69[理学—化学]