The ability of an active protective organic coating to restore its protection functionality in the event of a coating defect is crucial for ensuring durable performance under harsh corrosive conditions. In the present work, a novel thermogenesis effect polyurethane complex microsphere with a particle size of approximately 430 nm was developed using CNCs and LNPs as Pickering emulsifiers. The obtained microspheres (4 wt%) were incorporated into epoxy-amine networks, resulting in improved toughness and bending strength. Additionally, tensile measurement results demonstrated that the composite resin exhibited a self-healing efficiency of 81.25 % at room temperature within 30 min. Meanwhile, for the NIR-triggered self-healing process, the damaged samples could be locally repaired quickly. Experiments also showed that the microspheres exhibited excellent anti-ultraviolet aging performance and satisfying storage stability for more than 20 days at room temperature. Importantly, the as-prepared epoxy complex resin served as an in-situ self-healing metal coating, confirming its long-lasting corrosion resistance. This work provides an efficient strategy for high-performance self-healing materials, particularly epoxy anti-corrosion coatings.

中文翻译：

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制备聚氨酯复合微球并高性能用于自修复环氧涂料


活性保护性有机涂层在涂层缺陷的情况下恢复其保护功能的能力对于确保在恶劣腐蚀条件下的持久性能至关重要。在本工作中，使用 CNC 和 LNP 作为 Pickering 乳化剂开发了一种粒径约为 430 nm 的新型产热效应聚氨酯复合微球。将获得的微球 （4 wt%） 掺入环氧胺网络中，从而提高了韧性和弯曲强度。此外，拉伸测量结果表明，复合树脂在室温下 30 分钟内表现出 81.25% 的自修复效率。同时，对于 NIR 触发的自修复过程，受损样品可以快速局部修复。实验还表明，微球表现出优异的抗紫外线老化性能和令人满意的室温下 20 d 以上的储存稳定性。重要的是，所制备的环氧复合树脂用作原位自修复金属涂层，证实了其持久的耐腐蚀性。这项工作为高性能自修复材料，特别是环氧防腐涂层提供了一种有效的策略。