无机盐/膨胀石墨复合相变材料的制备及性能研究  

Preparation and performance of inorganic salt/expanded graphite composite phase change material

作　　者：任文静 陈振乾 徐志国 李微 陈翔燕 赵园园 REN Wenjing;CHEN Zhenqian;XU Zhiguo;LI Wei;CHEN Xiangyan;ZHAO Yuanyuan(Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of Ministry of Education,College of Energy and Environment, Southeast University, Nanjing 210000, China;Jiangsu Shengshi Electromechanical Engineering Co., Ltd., Nanjing 210000, China)

机构地区：[1]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,南京210000 [2]江苏盛世机电工程有限公司,南京210000

出　　处：《功能材料》2022年第7期7203-7209,共7页Journal of Functional Materials

基　　金：江苏省住房和城乡建设厅科技支撑项目(2021ZD26);国网江苏省电力有限公司科技项目(SGJSSJZXSJJS2100148)。

摘　　要：为了改善单一相变材料易泄露、潜热较低、稳定性差等问题,以三水合乙酸钠作为主要相变材料,十二水合磷酸氢二钠作为成核剂,聚丙烯酸钠作为增稠剂,膨胀石墨作为导热增强剂,通过熔融共混法制备了形状稳定的复合相变材料。通过步冷曲线法、DSC差示扫描量法、SEM扫描电镜及热循环实验对材料特性进行表征和测量。结果表明,膨胀石墨可以较好地吸附基底材料,起到导热桥架的作用,当膨胀石墨的含量逐渐增加时,复合相变材料的相变温度略微降低,过冷度有效减小,导热系数大幅提升,储热性能没有显著变化。综合分析,复合相变材料的最佳配比为n(SAT)∶n(DSP)∶n(PAAS)∶n(EG)=100%∶4%∶1%∶8%,其相变温度为57.1℃,相变潜热为219.2 kJ/kg,具有良好的热稳定性。In order to improve the problems of single phase change material,such as easy leakage,low latent heat,and poor stability,the shape-setting composite phase change material is prepared by the melt blending method,where sodium acetate trihydrate is used as the main phase change material,disodium phosphate is used as a nucleating agent,sodium polyacrylate is used as a thickener,and expanded graphite is used as a thermal conductivity enhancer.The material properties are characterized and measured by step cooling curve method,DSC differential scanning method,SEM scanning electron microscope and thermal cycling experiment.The results show that expanded graphite can better adsorb the base material and act as a thermal bridge.When the content of expanded graphite gradually increases,the phase transition temperature of the composite phase change material decreases slightly,the degree of subcooling is effectively reduced,and the thermal conductivity is greatly increased.Improved,there is no significant change in heat storage performance.Comprehensive analysis shows that the best ratio of composite phase change material is 100%SAT+DSP4%+1%PAAS+8%EG.In this case,the phase change temperature of the material is 57.1℃,and the phase change latent heat is 219.2 kJ/kg,which keeps good thermal stability.

关 键 词：三水合乙酸钠 膨胀石墨 复合材料 熔融共混 制备 热性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TB34