膨胀石墨/有机质复合相变材料的制备及性能

doi:10.16085/j.issn.1000-6613.2019-1610

摘要/Abstract

摘要：

以膨胀石墨为支撑材料，石蜡、十六酸和硬脂酸为相变主材，采用熔融共混法制备复合相变材料，并对材料的热-电性能进行测试分析。结果表明，在3种有机质中分别添加7%、9%和11%的膨胀石墨，并在4MPa下压制成型，分别在65℃、70℃和75℃的烘箱中充热30min，有机质均未出现泄漏；相比3种纯有机质，复合相变材料的充热时间分别缩短32s、622s和231s，其放热时间分别缩短1040s、1327s和1311s。充热时复合材料的升温速率比固态下的纯有机质快，放热时复合材料全过程都比纯有机质降温速率快；经过60次热循环之后质量损失率均小于0.05%；成型后的复合材料充热时，温度场分布均比纯有机质均匀，放热时温度场分布基本一致，但成型对复合材料的温升有所抑制；复合材料的热导率分别比对应的有机质提高10.12～11.19倍、9.00～15.50倍和5.58～6.76倍；在2～8MPa时，复合材料的电阻率分别在0.092～0.150Ω·cm、0.058～0.146Ω·cm和0.020～0.041 Ω·cm之间，均小于1Ω·cm，说明制备的复合相变材料具有良好的热-电性能。

关键词: 膨胀石墨, 复合相变材料, 温度场分布, 充-放热, 热-电性能

Abstract:

Paraffin (PW), palmitic acid (PA) and stearic acid (SA) were used as the main phase change materials, meanwhile expanded graphite （EG） for the framework. All the composite materials were prepared by melt-blending method, and their thermal and electrical properties were studied. The results showed that the three organic matter, adding expanded graphite with the mass fraction of 7%, 9% and 11%, had no leakage occurred, which were respectively heated in an oven with 65℃, 70℃ and 75℃all at 4MPa pressure for 30 minutes. The thermal storage shortened time of composite phase change materials was respectively 32s, 622s and 231s than the three pure organic matter. And the release shortened time was 1040s, 1327s and 1311s. It means that heating rate of the composite material was faster than the pure organic matter only in the solid state during the thermal storage, while the whole processes of the composite material were faster than the pure organic matter during the thermal release. It was found that all the mass loss rate was below 0.05% after 60 energy storage/release cycles too. The temperature field distribution of the composite materials after molding was more uniform than that of pure organic matter during the thermal storage, unlike that the two distributions were basically the same during the thermal release. The thermal conductivities of the composite materials at different temperatures were 10.12—11.19 times, 9.00—15.50 times and 5.58—6.76 times, respectively than the corresponding organic matter. The resistivities of the composite materials were 0.092—0.150Ω·cm, 0.058—0.146Ω·cm and 0.020—0.041Ω·cm at 2—8MPa pressure, respectively, all less than 1Ω·cm. It indicated that the prepared composite phase change materials had good thermo-physical and electrical properties.It might mean that the temperature rise was suppressed to a certain extent after the composite material molding.

Key words: expanded graphite, composite phase change materials, temperature field distributions, thermal storage and release, thermo-physical and electrical properties

中图分类号:

TK02

徐众, 侯静, 李军, 吴恩辉, 黄平, 刘黔蜀, 胥大伟. 膨胀石墨/有机质复合相变材料的制备及性能[J]. 化工进展, 2020, 39(7): 2758-2767.

Zhong XU, Jing HOU, Jun LI, Enhui WU, Ping HUANG, Qianshu LIU, Dawei XU. Preparation and performances of expanded graphite/organic matter composite phase change materials[J]. Chemical Industry and Engineering Progress, 2020, 39(7): 2758-2767.

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