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17. High-efficiency self-repairing anticorrosion coatings with controlled assembly microcapsules

Author

Zhang Yu, Wang Xin, Wu Jinglong, Kong Fanhou, Zhang Xuelong, and Xu Weichang

Subjects
Materials science, Mechanical Engineering, Core (manufacturing), 02 engineering and technology, Epoxy, Adhesion, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Isocyanate, 0104 chemical sciences, Corrosion, chemistry.chemical_compound, chemistry, Chemical engineering, Mechanics of Materials, visual_art, Self repairing, Emulsion, visual_art.visual_art_medium, General Materials Science, 0210 nano-technology, Thermal analysis
Abstract

Based on the principle of emulsion technology and self-assembly of materials, aromatic isocyanate derivatives easily reacted with polyols to form polyurethanes, and nonaromatic isocyanate derivatives were responsible for generating the capsule core of the self-healing microcapsules. In this paper, epoxy resin-based self-healing smart anticorrosion coatings with different types of microcapsules were prepared. The cores were IPDI/TMP–IPDI/DiPE–IPDI. The optimal conditions for the preparation of self-repairing microcapsules to achieve controlled assembly of a microcapsule material structure were determined. We set up a test model, incorporating thermal analysis, depression repair level calculation, salt spray corrosion tests, adhesion tests, and other indicators of application performance. The corrosion resistance was in the order: DiPE–IPDI > TMP–IPDI > IPDI > pure epoxy. The experimental results showed a self-healing efficiency of more than 80% for cores of DiPE–IPDI. Taking into account the overall properties, the best-quality coatings contained approximately 5% microcapsules of DiPE–IPDI.

Published
2018

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