Development and performance characterization of architectural energy storage materials with lauric acid-paraffin binary eutectic and nanosized SiO2 aerogel

doi:10.16085/j.issn.1000-6613.2023-2266

Abstract

Abstract:

In this paper, a binary eutectic mixture of lauric acid-paraffin (LA-PS) was prepared from lauric acid (LA) and paraffin (PS), and the binary eutectic mixture was adsorbed into nano-SiO₂ aerogel by vacuum adsorption method to form a composite phase change material lauric acid-paraffin/nano-SiO₂ aerogel. Leakage experiments showed that the maximum adsorption rate of the nano-SiO₂ aerogel to LA-PS was 70%. The results of Fourier infrared spectroscopy that the LA-PS/nano-SiO₂ aerogel had excellent chemical compatibility. The results of the DSC test showed that the phase transition temperature of the LA-PS/nano-SiO₂ aerogel was 35.19℃ and the latent heat of the phase transition was 115.89J/g. In addition, the LA-PS/nanosized SiO₂ aerogel had an energy storage efficiency of 98.99%, indicating that LA-PS/nanosized SiO₂ aerogel had good thermal storage properties. Therefore, the prepared composite phase change materials had suitable phase change temperature, high latent heat of phase change and good thermal stability and durability for the utilization of transparent enclosure for glass windows, and thus having a good application prospect.

Key words: composite phase change materials, fatty acids, paraffin, nanosized SiO₂ aerogel, building energy efficiency

摘要：

以月桂酸（LA）和石蜡（PS）为原料制备了月桂酸-石蜡（LA-PS）二元共晶混合物，通过真空吸附法将二元共晶混合物吸附到纳米SiO₂气凝胶中形成复合相变材料月桂酸-石蜡/纳米SiO₂气凝胶。泄漏实验表明，纳米SiO₂气凝胶对LA-PS的最大吸附率为70%；傅里叶红外光谱的结果显示，LA-PS/纳米SiO₂气凝胶具有优异的化学相容性；DSC测试结果显示，LA-PS/纳米SiO₂气凝胶的相变温度为35.19℃，相变潜热为115.89J/g。此外，LA-PS/纳米SiO₂气凝胶的储能效率为98.99%，说明LA-PS/纳米SiO₂气凝胶具有良好的蓄热性能。因此，制备的复合相变材料在玻璃窗透明围护结构利用方面，具有合适的相变温度、较高的相变潜热和较好的热稳定性和耐久性，从而具有较好的应用前景。

关键词: 复合相变材料, 脂肪酸, 石蜡, 纳米二氧化硅气凝胶, 建筑节能

CLC Number:

TB34

WEN Jing, ZHANG Hongying, ZHANG Yingdong, XU Runze. Development and performance characterization of architectural energy storage materials with lauric acid-paraffin binary eutectic and nanosized SiO₂ aerogel[J]. Chemical Industry and Engineering Progress, 2025, 44(1): 388-397.

闻静, 张红婴, 张屹东, 许润泽. 月桂酸-石蜡二元共晶和纳米SiO₂气凝胶新型建筑储能材料的研制和性能表征[J]. 化工进展, 2025, 44(1): 388-397.

Figures/Tables 17

相变材料	熔化温度 $T_{m}$ /℃	熔化潜热 $H_{m}$ /J·g^-1	凝固温度 $T_{f}$ /℃	凝固潜热 $H_{f}$ /J·g^-1
月桂酸(LA)	43.3	178.11	32.97	178.98
石蜡(PS)	30.79	36.03	23.98	34.09
石蜡(PS)	55.04	165.2	43.90	181.7
LA-PS(75∶25)	37.28	171.86	34.11	180.36
LA-PS(76∶24)	37.25	181.16	34.23	179.46
LA-PS(77∶23)	37.50	179.66	34.48	187.46

相变材料	熔化温度 $T_{m}$ /℃	熔化潜热 $H_{m}$ /J·g^-1	凝固温度 $T_{f}$ /℃	凝固潜热 $H_{f}$ /J·g^-1
月桂酸(LA)	43.3	178.11	32.97	178.98
石蜡(PS)	30.79	36.03	23.98	34.09
石蜡(PS)	55.04	165.2	43.90	181.7
LA-PS(75∶25)	37.28	171.86	34.11	180.36
LA-PS(76∶24)	37.25	181.16	34.23	179.46
LA-PS(77∶23)	37.50	179.66	34.48	187.46

性能	实验仪器	制造商（型号）	实验条件
CPCMs的微观形态	扫描电子显微镜（SEM）	FEI MLA650F, USA	—
CPCMs的热性能稳定性	差示扫描量热仪（DSC）	美国DSC2500	0~80℃，5℃/min，N₂
CPCMs的化学结构	傅里叶变换红外光谱仪（FTIR）	美国热电科学公司Nicolet iS20	波数范围：400~4000cm^-1
CPCMs的晶体结构	X射线衍射仪（XRD）	德国布鲁克D8 Advance	角度范围：5°~90° 扫描速度：10(°)/min
CPCMs的热稳定性	热重分析仪（TG）	NETZSCH STA499 F5，德国	30~600℃，N₂，10℃/min

质量比	热处理前的质量m₁/g	热处理后的质量m₂/g	泄漏率 $η$ /%
60∶40	0.471	0.471	仪器未检测出
65∶35	0.418	0.418	仪器未检测出
70∶30	0.406	0.404	0.4
75∶25	0.496	0.490	1.2
80∶20	0.516	0.506	1.9

质量比	热处理前的质量m₁/g	热处理后的质量m₂/g	泄漏率 $η$ /%
60∶40	0.471	0.471	仪器未检测出
65∶35	0.418	0.418	仪器未检测出
70∶30	0.406	0.404	0.4
75∶25	0.496	0.490	1.2
80∶20	0.516	0.506	1.9

参数	数值/%
$η$	70
$R$	63.97
$E$	63.32
$φ$	91.39
$μ$	98.99

参数	数值/%
$η$	70
$R$	63.97
$E$	63.32
$φ$	91.39
$μ$	98.99

复合相变材料	吸附率 /%	熔化温度 /℃	熔化潜热 /J·g^-1	参考文献
硬脂酸/膨胀石墨	37	53.2	48.4	[42]
SA/海泡石	49	67.1	94.4	[43]
CA-MA/蛭石	50	21.8	72.6	[44]
a-MMT/SA	48	59.9	84.4	[45]
海泡石/石蜡	50	35.70	62.08	[46]
电纺SiO₂/CA-LA-PA	81.3	21.7	100.9	[47]
膨胀珍珠岩/LA-PA-SA	55	31.8	81.5	[48]
蛭石/LA-PA-SA	50	31.4	75.8	[49]

循环次数/次	$T_{m}$ /℃	$H_{m}$ /J·g^-1	$T_{f}$ /℃	$H_{f}$ /J·g^-1
1	35.19	115.89	32.45	112.47
250	35.64	115.14	32.75	111.93
500	36.29	114.76	32.90	108.78
750	34.33	112.45	31.16	102.67
1000	33.98	110.59	31.36	104.37

循环次数/次	$T_{m}$ /℃	$H_{m}$ /J·g^-1	$T_{f}$ /℃	$H_{f}$ /J·g^-1
1	35.19	115.89	32.45	112.47
250	35.64	115.14	32.75	111.93
500	36.29	114.76	32.90	108.78
750	34.33	112.45	31.16	102.67
1000	33.98	110.59	31.36	104.37

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Development and performance characterization of architectural energy storage materials with lauric acid-paraffin binary eutectic and nanosized SiO₂ aerogel

月桂酸-石蜡二元共晶和纳米SiO₂气凝胶新型建筑储能材料的研制和性能表征

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