Preparation and properties of composite phase-change materials with sodium acetate trihydrate

doi:10.19799/j.cnki.2095-4239.2023.0609

Abstract

Abstract:

In this study, a series of composite phase-change materials (CPCMs) were prepared by the melt-blending method using sodium carboxymethyl cellulose as a thickener; disodium hydrogen phosphate dodecahydrate, disodium hydrogen phosphate anhydrous, nano-Al₂O₃, and nano-Al₂O₃ modified by sodium dodecyl sulfate as nucleating agents; and graphite as a thermally conductive enhancer. A comprehensive analysis of the composition, morphology, and thermal properties of CPCMs was performed using an infrared spectrometer, scanning electron microscope, differential scanning calorimeter, and temperature acquisition system. The results show that the addition of 2% sodium carboxymethylcellulose/3% disodium hydrogen phosphate dodecahydrate or 2% sodium carboxymethylcellulose/1% modified nano-Al₂O₃ to sodium acetate trihydrate matrix can effectively solve the problems of SAT phase separation and large supercooling. The DSC analysis results indicate that the enthalpies of phase transition for the CPCMs are maintained at 247.98 J/g and 244.64 J/g. Adding 2% sodium carboxymethyl cellulose/3% disodium hydrogen phosphate dodecahydrate/1% graphite or 2% sodium carboxymethyl cellulose/3% disodium hydrogen phosphate dodecahydrate/1% modified nano-Al₂O₃/1% graphite to the sodium acetate trihydrate matrix enhances the thermal conductivity of the CPCMs without increasing supercooling during rapid-cycling storage. Exothermic experiments were carried out on the CPCMs, and the changes in relative latent heat were calculated using the T-history method. The rate of heat decay was found to increase with the increase in the number of cycles. The first formulation tended to stabilize after reaching 40 cycles, with a heat decay of approximately 23%, whereas the second formulation tended to have an increase in the degree of subcooling after 50 cycles. These results help promote the application of phase-change materials in the field of thermal storage and provide an experimental basis for the development of composite phase-change materials by ensuring the high enthalpy and high stability of sodium acetate trihydrate.

Key words: sodium acetate trihydrate, thickening agent, nucleating agent, graphite, cyclic storage and exothermic experiment

CLC Number:

TK 02

Guochao YIN, Junxiang LIU, Qingbo YU, Haolei WANG. Preparation and properties of composite phase-change materials with sodium acetate trihydrate[J]. Energy Storage Science and Technology, 2023, 12(12): 3643-3654.

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材料名称	规格	生产厂家
三水乙酸钠	分析纯	国药集团化学试剂有限公司
无水磷酸氢二钠	分析纯	国药集团化学试剂有限公司
羧甲基纤维素钠	分析纯	国药集团化学试剂有限公司
十二水磷酸氢二钠	分析纯	国药集团化学试剂有限公司
十二烷基硫酸钠	分析纯	国药集团化学试剂有限公司
纳米氧化铝( α -Al₂O₃)	分析纯	中冶新材料有限公司
微米石墨	分析纯	比斯利新材料有限公司

设备名称	型号	生产厂家
低温恒温槽	DC-0506	东莞三量量具有限公司
电子天平	LQ-C5001	上海瑶新电子科技有限公司
电热恒温干燥箱	101-0B	绍兴市苏珀仪器有限公司
数据采集仪	ADAM-4018	研华科技有限公司
多头磁力搅拌器	HJ-4A	江苏科析仪器有限公司
超声波清洗仪	KQ2200B	昆山市超声仪器有限公司
扫描电镜	Hitachi Regulus8100	日本日立公司
差示扫描量热仪	DSC 2500	美国TA仪器公司
傅里叶红外光谱仪	Nicolet iS 10	美国赛默飞世尔科技公司
纳米粒度及Zeta 电位分析仪	ZS ZEN3600	英国马尔文仪器有限公司
同步热分析仪	HITACHI STA200	日本日立公司
振荡仪	VM-210	宁波群安仪器有限公司

样品	质量分数/%
样品	SAT	DSP	改性纳米Al₂O₃	CMC-Na	石墨
1	100	0	0	2	0
2	100	2	0	2	0
3	100	3	0	2	0
4	100	0	1	2	0
5	100	0	2	2	0
6	100	0	3	2	0
7	100	3	0	2	1
8	100	3	1	2	0
9	100	3	1	2	1
10	100	3	1	2	2

样品组分质量比	开始结晶温度/℃	峰值温度/℃	最高热流/(W/g)	相变焓/(J/g)
样品1 SAT∶CMC-Na=100∶2	58.27	61.00	5.52	264.02
样品3 SAT∶DSP∶CMC-Na=100∶3∶2	59.00	62.09	5.08	247.98
样品4 SAT∶改性纳米Al₂O₃∶CMC-Na=100∶1∶2	57.83	63.64	4.13	244.64

循环次数/次	开始结晶温度/℃	D	理论热衰减率/%
1	57.0	140.7	0
10	57.2	135.8	3.4
20	57.3	123.3	12.4
30	58.4	113.3	19.5
40	58.6	108.3	23.0
50	58.7	108.1	23.2