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Preparation and Performance Study of Titanium Dioxide-Urea-Formaldehyde Resin Composite Shell Phase Change Microcapsules for Cold Storage
- Journal of Refrigeration Vol. 46, Issue 6, Pages: 123-131(2025)
- 作者机构：
苏州科技大学环境科学与工程学院 苏州 215009
- 作者简介：
Sun Zhigao, male, Ph. D., professor, School of Environmental Science and Engineering, Suzhou University of Science and Technology, 86-512-63176109, E-mail: szg.yzu@163.com. Research fields: energy storage and energy conservation.
- 基金信息：
DOI：10.12465/j.issn.0253-4339.2025.06.123
CLC： TB61+1;TB64Received：19 August 2024，
Revised：2024-10-30，
Accepted：04 November 2024，
Published：16 December 2025
- 稿件说明：
移动端阅览
Huang Zhiguo, Sun Zhigao, Shen Tianfeng. Preparation and Performance Study of Titanium Dioxide-Urea-Formaldehyde Resin Composite Shell Phase Change Microcapsules for Cold Storage[J]. Journal of Refrigeration, 2025, 46(6): 123-131.
Huang Zhiguo, Sun Zhigao, Shen Tianfeng. Preparation and Performance Study of Titanium Dioxide-Urea-Formaldehyde Resin Composite Shell Phase Change Microcapsules for Cold Storage[J]. Journal of Refrigeration, 2025, 46(6): 123-131. DOI： 10.12465/j.issn.0253-4339.2025.06.123.
摘要
结合有机壳层和无机壳层的优点，利用“两步法”制备了二氧化钛-脲醛树脂复合壳层相变微胶囊（TiO
2
-UF@Tet微胶囊），研究了纳米TiO
2
对复合壳层相变微胶囊性能的影响。借助生物显微镜、扫描电子显微镜、傅里叶红外光谱仪、能谱分析仪、差示扫描量热仪和热重分析仪等对相变微胶囊的形貌、化学组成和热力学性质进行研
究。结果表明：通过“两步法”制备的微胶囊具有良好的复合壳层结构；随着TiO
2
添加量的增加，微胶囊的热稳定性不断增强，相变温度向低温方向偏移，相变潜热降低，导热系数增大；制备的微胶囊表面光滑，粒径分布均匀，平均粒径约为2.0 μm；最佳组分相变温度和相变潜热分别为3.1 ℃和168.5 J/g，包覆率和包覆效率分别为71.64%和69.08%；热循环100次后，相变焓趋于稳定，微观形貌良好，适用于空调系统蓄冷。
Abstract
TiO
2
-UF@Tet microcapsules were prepared using a two-step method in which the advantages of organic and inorganic shell layers were combined. The effect of the mass fraction of TiO
2
on the performance of the composite-shell phase-change microcapsules was investigated. The morphology
chemical composition
and thermodynamic properties of the phase change microcapsules were investigated using biological microscopy
scanning electron microscopy
Fourier-transform infrared spectroscopy
energy-dispersive spectroscopy
differential scanning calorimetry
and thermogravimetric analysis. The experimental results showed that the microcapsules formed by TiO
2
and UF using the two-step method had a good composite shell structure. The phase-transition temperature of the microcapsules decreased
the latent heat of the phase transition decreased
and the thermal conductivity increased continuously with an increase in the mass fraction of TiO
2
. The prepared microcapsules had smooth surfaces
a uniform particle size distribution
and an average particle size of approximately 2.0 μm. The phase transition temperature and latent heat of the optimal composition were 3.1 ℃ and 168.5 J/g
respectively
with a coating rate and coating efficiency of 71.64% and 69.08%
respectively. After 100 heating cycles
the phase-transition temperature remained stable and the microstructure was good. These microcapsules are suitable for cold-storage air conditioning systems.
关键词
Keywords
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