癸酸-十六醇作为相变储能材料的相变特性

doi:10.16085/j.issn.1000-6613.2019-0335

摘要/Abstract

摘要：

以癸酸（CA）和十六醇（H）为原料，通过熔融共混法制备了二元脂肪酸醇复合相变材料，并利用步冷曲线法确定癸酸-十六醇（CA-H）二元复合相变材料的最佳质量配比为74∶26，共晶温度为24.5℃，过冷度为0.2℃。采用傅里叶红外光谱仪（FTIR）、X射线衍射仪（XRD）、蓄放热实验和冷热加速循环实验等研究了CA-H复合相变材料的结构与性能，发现CA-H的FTIR曲线上同时存在CA和H的特征吸收峰，CA-H的XRD图谱上存在CA和H的衍射峰，说明CA与H是通过分子力作用在一起，没有发生化学反应。然后对CA-H进行500次5～80℃冷热加速循环实验，发现其相变温度和相变潜热变化较小，可见CA-H的热循环稳定性良好，且蓄放热性能较好。同时，根据差示扫描量热仪（DSC）分析得到CA-H的相变温度为24.22℃，相变潜热为190.5J/g，这与通过步冷曲线测得的共晶温度吻合。因此，该CA-H复合相变材料适用于建筑节能、空调冷凝热回收及低温太阳能热储存等领域。

关键词: 复合材料, 相变, 二元混合物, 癸酸, 十六醇

Abstract:

The binary organic composite phase change material was prepared by melt blending method with capric acid (CA) and hexadecanol (H) as raw material. The optimum mass ratio of capric acid-hexadecanol (CA-H) binary composite phase change material equated to 74∶26, eutectic temperature and super-cooling degree up to 24.5℃ and 0.2℃ was determined with cooling curve method. The structure and properties of CA-H composite phase change materials were characterized by fourier transform infrared spectrometer (FTIR), X ray diffractometer (XRD), heat storage and exothermic experiments and accelerated thermal cycling experiments. It was found that the characteristic absorption peaks of CA and H coexisted in FTIR curve of CA-H, and the diffraction peaks of CA and H coexisted in XRD spectra of CA-H, indicating that CA and H were combined by molecular forces without chemical reaction. After 500 thermal cycles between 5℃ and 80℃, the change of the phase transition temperature and latent heat were not significant. It showed that CA-H had better thermal stability, and heat storage and release performance were good. According to the differential scanning calorimeter (DSC), the phase change temperature and the corresponding latent heat of CA-H were 24.22℃ and 190.5J/g respectively, which was consistent with the eutectic temperature measured by cooling curve. Therefore, the CA-H composite phase change material was suitable for building energy conservation, condensation heat recovery of air conditioning and low temperature solar energy heat storage.

Key words: composites, phase change, binary mixture, capric acid, hexadecanol

中图分类号:

TK02

顾庆军,费华,王林雅,方敏,蒋达华,赵运超. 癸酸-十六醇作为相变储能材料的相变特性[J]. 化工进展, 2019, 38(11): 5033-5039.

Qingjun GU,Hua FEI,Linya WANG,Min FANG,Dahua JIANG,Yunchao ZHAO. Phase transition properties of capric acid-hexadecanol as phase change energy storage material[J]. Chemical Industry and Engineering Progress, 2019, 38(11): 5033-5039.

图/表 11

图1 实验装置示意图1—计算机；2—温度巡检仪；3—恒温恒湿培养箱；4—试管架；5—相变材料样品；6—热电阻；7—试管

图2 CA、H及CA-H二元混合物的步冷曲线

图3 CA-H二元体系的T-X相图

图4 CA-H二元体系的过冷度

图5 CA、H及CA-H二元低共熔混合物的DSC曲线

表1 CA、H及CA-H二元低共熔混合物的热性能参数

47.04

42.63

149.5

93.83

图6 CA、H及CA-H二元低共熔混合物的FTIR曲线

图7 CA、H及CA-H二元低共熔混合物的XRD图谱

图8 CA-H二元低共熔混合物的熔化凝固曲线

图9 冷热循环前后CA-H的DSC图

图10 CA-H多次冷热循环后的步冷曲线

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