目的 为响应冷链物流行业的节能减排需求,针对传统低温相变材料（PCM）普遍难以兼顾高潜热、高导热与高稳定性的核心痛点,本研究研发了一种适用于生鲜冷链温区（1~3 ℃）的三元复合PCM。方法 该材料以0.7%麦芽糖醇水溶液为相变基料,添加1.5%瓜尔豆胶抑制相分离并引入1.0%膨胀石墨（EG）构建导热与成核网络。研究系统表征了材料的热物理性能、循环稳定性与防腐蚀特性。结果 结果表明,三元协同改性机制显著提升了体系性能,材料相变温度为1.9 ℃,相变潜热达322.2 kJ/kg,导热系数提升至0.9504 W/(m·K)。经50次热循环后无分层、无渗漏,潜热变化率仅为0.56%,过冷度小于0.3 ℃。结论 本材料兼具低成本、无腐蚀性与高蓄冷效能,为水基低温PCM在生鲜冷链包装场景中的规模化应用提供了坚实的材料基础与设计范式。
Abstract
In response to the energy conservation and emission reduction demands of the cold chain logistics industry, the work aims to develop a ternary composite phase change material (PCM) suitable for the fresh food cold chain temperature range (1-3 ℃), addressing the core issue that traditional low-temperature PCMs generally struggle to balance high latent heat, high thermal conductivity, and high stability. With a 0.7% maltitol aqueous solution as the phase change base material, 1.5% guar gum was added to inhibit phase separation, and 1.0% expanded graphite (EG) was incorporated to construct a thermal conduction and nucleation network. The thermal physical properties, cycling stability, and anti-corrosion characteristics of the material were systematically characterized. The results showed that the ternary synergistic modification mechanism significantly improved the system performance. The phase change temperature of the material was 1.9 ℃, the latent heat was 322.2 kJ/kg, and the thermal conductivity increased to 0.950 4 W/(m·K). After 50 thermal cycles, there was no layering or leakage, and the latent heat change rate was only 0.56%, with a supercooling degree of less than 0.3 ℃. This material combines low cost, non-corrosiveness, and high cold storage efficiency, providing a solid material foundation and design paradigm for the large-scale application of water-based low-temperature PCMs in fresh food cold chain packaging scenarios.
关键词
生鲜冷链包装 /
低温相变材料 /
麦芽糖醇水溶液 /
热物理性能 /
协同改性
Key words
fresh food cold chain packaging /
low-temperature phase change materials /
maltitol aqueous solution /
thermophysical properties /
synergistic modification
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