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

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.