SA-DES抗冻膜失效机理及封层调控

李金颖; 倪博文; 刘正午; 何锋; 石嘉仪; 梁东武

doi:10.19554/j.cnki.1001-3563.2026.11.003

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包装工程（技术栏目） ›› 2026, Vol. 47 ›› Issue (11) : 16-29. DOI: 10.19554/j.cnki.1001-3563.2026.11.003

功能性生物质材料

SA-DES抗冻膜失效机理及封层调控

李金颖^a, 倪博文^a, 刘正午^a, 何锋^a, 石嘉仪^a, 梁东武^a,b*

作者信息 +

Failure Mechanism and Sealing Regulation of SA-DES Anti-freezing Gel Films

LI Jinying^a, NI Bowen^a, LIU Zhengwu^a, HE Feng^a, SHI Jiayi^a, LIANG Dongwu^a,b*

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文章历史 +

摘要

目的针对海藻酸钠（SA）基冷链包装膜在高湿冻融环境下易吸湿脆化和结构失稳的问题,构建食品级糖基低共熔溶剂/海藻酸钠（DES/SA）抗冻凝胶膜,并引入蜡基疏水封层以提升其长期冻融稳定性。方法制备4种糖基DES,系统评价其低温热行为和成膜适配性,筛选最优组分制备SA-DES凝胶膜;通过高湿吸湿、溶胀及冻融循环实验揭示其失效机制;并在膜表面构建蜂蜡疏水封层,评价其长效阻湿与冻融稳定性。结果 Pro-Tre为最优DES组分,SA-Pro-Tre凝胶膜在-30 ℃下仍保持良好柔韧性,断裂应变较纯SA膜提升约30倍。外界水分持续入侵会诱导DES稀释与外流,破坏内部氢键网络,导致抗结晶能力下降和力学性能衰减。构建蜡基封层后膜表面水接触角提升至130.8°,BW/SA-Pro-Tre经30次冻融循环后应力和应变保留率分别达91.03%和88.58%,显著优于未封层样品（71.8%和75.38%）。结论 SA-DES体系的抗冻性能源于DES、SA与水分子间多重氢键网络的协同调控;高湿冻融失效的本质是水分入侵、DES稀释外流与氢键网络破坏的耦合过程。“内部DES调控水分状态-外部蜡基封层阻断水分入侵”的协同策略为高湿冷链环境下生物基包装材料的失效防控提供了新思路。

Abstract

Sodium alginate (SA)-based cold-chain packaging films are prone to moisture absorption, embrittlement, and structural instability under high-humidity freeze-thaw conditions. The work aims to develop food-grade sugar-based deep eutectic solvent/sodium alginate (DES/SA) anti-freezing gel films with a wax-based hydrophobic sealing layer introduced to enhance long-term freeze-thaw stability. Four sugar-based DESs were prepared to systematically evaluate their low-temperature thermal behavior and film-forming adaptability. The optimal components were screened to prepare SA-DES gel films. The failure mechanism was revealed through high-humidity moisture absorption, swelling and freeze-thaw cycle experiments. A hydrophobic beeswax-based sealing layer was constructed on the film surface to evaluate its long-term moisture resistance and freeze-thaw stability. The result showed that Pro-Tre was the optimal DES component. The resulting SA-Pro-Tre gel film maintained excellent flexibility at -30 °C, with a fracture strain approximately 30 times higher than that of pure SA films. Further investigation revealed that continuous moisture invasion induced DES dilution and exudation, disrupting the internal hydrogen bond network and leading to reduced anti-crystallization capacity and mechanical degradation. After applying the wax-based sealing layer, the surface water contact angle increased to 130.8°, and BW/SA-Pro-Tre retained 91.03% and 88.58% of its stress and strain after 30 freeze-thaw cycles, significantly outperforming the unsealed counterpart (71.8% and 75.38%). The anti-freezing performance of the SA-DES system stems from the coordinated regulation of the multiple hydrogen bond network among DES, SA and water molecules. The essence of high-humidity freeze-thaw failure is a coupling process of water invasion, DES dilution and outflow, and hydrogen bond network disruption. The synergistic strategy of "internal DES-mediated moisture regulation and external wax-based moisture blocking", offering new insights for the design and failure prevention of bio-based packaging materials in high-humidity cold-chain environments.

导出引用

李金颖, 倪博文, 刘正午, 何锋, 石嘉仪, 梁东武. SA-DES抗冻膜失效机理及封层调控[J]. 包装工程. 2026, 47(11): 16-29 https://doi.org/10.19554/j.cnki.1001-3563.2026.11.003

LI Jinying, NI Bowen, LIU Zhengwu, HE Feng, SHI Jiayi, LIANG Dongwu. Failure Mechanism and Sealing Regulation of SA-DES Anti-freezing Gel Films[J]. Packaging Engineering. 2026, 47(11): 16-29 https://doi.org/10.19554/j.cnki.1001-3563.2026.11.003

中图分类号： TB484

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