十八烷/膨胀石墨定形相变材料的制备与性能  

Preparation and properties of octadecane/expanded graphite forming phase change materials

作　　者：张伟丽 杜焦丽 唐婷 高宁 蔡迪 邱杰 李又兵[1,2,3] ZHANG Weili;DU Jiaoli;GAO Ning;CAI Di;QIU Jie;LI Youbing(School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Key Laboratory of Mold Technology,Chongqing 400054,China;Key Laboratory of Advanced Manufacturing Technology of Automobile Parts,Ministry of Education,Chongqing 400054,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆市模具技术重点实验室,重庆400054 [3]汽车零部件先进制造技术教育部重点实验室,重庆400054

出　　处：《功能材料》2023年第4期4225-4229,4236,共6页Journal of Functional Materials

基　　金：重庆市教委创新团队资助项目(clgycx20202001)。

摘　　要：针对建筑节能储能材料的应用,采用真空吸附法制备了一系列十八烷含量不同的十八烷/膨胀石墨定形相变材料,通过微观形貌观察、渗漏性能测试、差式扫描量热分析和冷热循环稳定性分析探究膨胀石墨吸附十八烷的最佳含量以及其各项性能。通过分析得出,当十八烷的吸附量为90%(质量分数)时,该吸附含量下的十八烷/膨胀石墨定形相变材料综合性能最佳,其熔融焓和凝固焓值分别为188、186.9 J/g,与国内外不同复合相变材料相比,具有较高的焓值。通过50℃烘箱加热2 h后,也没有明显的十八烷渗出的现象,质量损失率均小于1%,说明其具备了较好的防渗漏性能和结构稳定性。Aiming at the application of energy-saving and energy storage materials for buildings,a series of octadecane/intumescent graphite forming phase change materials with different octadecane content were prepared by vacuum adsorption method,and the optimal content of octadecane adsorption and its properties were explored through microscopic morphological observation,leakage performance test,differential scanning calorimetry analysis and cold-thermal cycle stability analysis.Through the analysis,it is concluded that when the adsorption amount of octadecane is 90 wt%,the comprehensive performance of the octadecane/expanded graphite forming phase change material under the adsorption content is the best,and its enthalpy of molten enthalpy and solidification enthalpy are 188 J/g and 186.9 J/g,which has a higher enthalpy values compared with different composite phase change materials at home and abroad.After heating the oven at 50℃for 2 h,there is no obvious phenomenon of octadecane exudation,and the quality loss rate is less than 1%,indicating that it has good anti-leakage performance and structural stability.

关 键 词：真空吸附法 膨胀石墨 十八烷 定形相变 焓值 渗漏性能 

分 类 号：TU551.2[建筑科学—建筑技术科学]