三水醋酸钠/甲酰胺复合相变材料的制备及性能

doi:10.11949/j.issn.0438-1157.20150687

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 5142-5148.DOI: 10.11949/j.issn.0438-1157.20150687

• 材料化学工程与纳米技术 • 上一篇下一篇

三水醋酸钠/甲酰胺复合相变材料的制备及性能

方玉堂, 金策, 梁向晖, 高学农, 张正国

华南理工大学传热强化与过程节能教育部重点实验室, 广东广州 510640

收稿日期:2015-05-25 修回日期:2015-08-08 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 方玉堂
基金资助:
国家自然科学基金项目(21276089,21471059)。

Preparation and performance of sodium acetate trihydrate/formamide composite phase change material

FANG Yutang, JIN Ce, LIANG Xianghui, GAO Xuenong, ZHANG Zhengguo

Key Laboratory of Enhanced Heat Transfer &Energy Conservation, Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2015-05-25 Revised:2015-08-08 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Natural Science Foundation of China (21276089, 21471059).

摘要/Abstract

摘要：

以甲酰胺(FA)为改性剂,采用熔融共混法对三水醋酸钠(SAT)进行改性得到新型SAT/FA复合相变材料(CPCM)。探讨FA质量分数(下同)对SAT/FA共混物(基体)相变焓及相变温度的影响。利用熔融-固化循环及步冷曲线, 系统探讨成核剂、增稠剂对复合材料相分离、过冷度及放热性能的影响。对新型SAT/FA CPCM的结构及性能进行XRD 、FTIR及DSC表征。结果显示:添加25%的FA于SAT中可形成SAT/FA低共融体;添加2% 十二水磷酸氢二钠成核剂和2%聚乙烯醇增稠剂形成的CPCM,过冷度低(2.67℃),放热时间长(10170 s),循环稳定性好, 相变焓高达233.9 kJ·kg^-1,相变温度40.88 ℃。可应用于相变蓄热地板辐射采暖。

关键词: 三水醋酸钠/甲酰胺复合相变材料, 低共融体, 相变焓, 过冷度, 循环稳定性

Abstract:

Formamide (FA) as modifier, a novel sodium acetate trihydrate (SAT)/formamide (FM) composite phase change material (CPCM) was prepared by melt blending method. The influence of the formamide mass fraction (the same as below) on the phase change enthalpy and the temperature of SAT/FA mixture (matrix) was discussed. The effects of nucleating agent and thickening agent on the phase separation, the degree of supercooling and the release time of composite material were systematically investigated by melting-solidification cycle and step cooling curve. The structure and performance of novel CPCM were characterized by FTIR, XRD and DSC. The results showed that the SAT/FA eutectic mixture formed by adding 25% formamide into SAT. The SAT/FA CPCM formed by adding 2% disodium hydrogen phosphate dodecahydrate (DSP) as the nuclear agent and 2% polyvinyl alcohol (PVA) as thickening agent, had a low degree of supercooling (2.67℃), long heat release time (10170 s) and excellent cycling stability. Its phase change enthalpy and temperature were 233.9 kJ·kg^-1 and 40.88℃, respectively, indicating that it can be applied to floor radiant heating with phase change thermal storage.

Key words: sodium acetate trihydrate/formamide composite phase change material, eutectic, phase change enthalpy, surpercooling degree, cycling stability

中图分类号:

TQ110.1
TK02

方玉堂, 金策, 梁向晖, 高学农, 张正国. 三水醋酸钠/甲酰胺复合相变材料的制备及性能[J]. 化工学报, 2015, 66(12): 5142-5148.

FANG Yutang, JIN Ce, LIANG Xianghui, GAO Xuenong, ZHANG Zhengguo. Preparation and performance of sodium acetate trihydrate/formamide composite phase change material[J]. CIESC Journal, 2015, 66(12): 5142-5148.

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三水醋酸钠/甲酰胺复合相变材料的制备及性能

Preparation and performance of sodium acetate trihydrate/formamide composite phase change material

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