基于熔融共混法,以石蜡（PA）和聚乙二醇（PEG）为相变基体材料,中间相nano-SiO2和EG作为粘结剂、导热添加剂和定型材料制备不同比例的宽温域梯度复合相变材料（WT-CPCM）,测定WT-CPCM的储热密度、导热系数、高温稳定性以及不同功率加热下的温度响应。实验结果表明WT-CPCM的导热系数和储热密度与各组分的占比密切相关：PA与PEG比例为50∶110、导热填料nano-SiO2为0.5%、EG为1.5%时,WT-CPCM的热导率最高达0.71 W/（m·K）,进一步填充至Al2O3多孔载体中其导热系数达到1.06 W/（m·K）,是纯材料PA、PEG热导率的4.2和3.8倍;WT-CPCM的储/放热过程中具有两个典型特征峰,总潜热值可达186.49 J/g,在不同功率加热下,WT-CPCM的热响应曲线响应迅速。
Abstract
Based on the melt blending method, a wide temperature gradient composite phase change material （WT-CPCM） with different proportions was prepared using paraffin （PA） and polyethylene glycol （PEG） as phase change matrix materials, mesophase nano-SiO2 and EG as binders, thermal conductivity additives, and shaping materials. The thermal storage density, thermal conductivity, high-temperature stability, and temperature response of WT-CPCM under different power heating were measured. The experimental results show that the thermal conductivity and thermal storage density of WT-CPCM are closely related to the proportion of each component： when the ratio of PA to PEG is 50∶110, and the thermal conductivity filler nano-SiO2 is 0.5% and EG is 1.5%, the maximum thermal conductivity of WT-CPCM is 0.71 W/（m·K）. Further filling into the Al2O3 porous carrier results in a thermal conductivity of 1.06 W/（m·K）, which is 4.2 and 3.8 times higher than that of pure materials PA and PEG; The heat storage/release process of WT-CPCM has two typical characteristic peaks, with a total latent heat value of 186.49 J/g. Under different heating powers, the thermal response curve of WT-CPCM responds quickly.
关键词
石蜡 /
聚乙二醇 /
储热 /
膨胀石墨 /
复合相变材料
Key words
paraffin /
polyethylene glycol /
heat storage /
expanded graphite /
composite phase change materials
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基金
湖南省教育厅科学研究项目（优秀青年）（23B0326）
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