| CHEN Yaofeng,LI Yujing,ZHAO Guangbin,YANG Kaijun,ZHU Jinpeng.Research Progress in Preparation of Self-healing Superhydrophobic Coatings[J],54(10):61-81 |
| Research Progress in Preparation of Self-healing Superhydrophobic Coatings |
| Received:November 14, 2024 Revised:January 02, 2025 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.10.005 |
| KeyWord:superhydrophobic self-healing environmental protection sustainable autonomous response |
| Author | Institution |
| CHEN Yaofeng |
Central China Branch, Oriental Green Energy Hebei Co., Ltd., Zhengzhou , China |
| LI Yujing |
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou , China |
| ZHAO Guangbin |
Central China Branch, Oriental Green Energy Hebei Co., Ltd., Zhengzhou , China |
| YANG Kaijun |
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou , China |
| ZHU Jinpeng |
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou , China |
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| Abstract: |
| Superhydrophobic surfaces refer to special surfaces with a water contact angle of greater than 150° and a roll-off angle of less than 10°. They are ubiquitous in nature, such as lotus leaves, dragonfly wings, sagebrush leaves, shark skin, and water strider legs. In recent years, superhydrophobic surfaces have attracted extensive attention due to their application in anti-icing, anti-corrosion, self-cleaning, oil-water separation, and drag reduction. With the increasing development demands and the progress of in-depth research, superhydrophobic coatings have become a hot research topic in scientific exploration. Based on the functional design of superhydrophobic coatings, researchers are committed to developing environmentally friendly, durable, and repairable superhydrophobic coatings, while expanding their advanced application fields. Over the past two decades, superhydrophobic coatings have made significant progress in various fields, but these surfaces still have poor mechanical stability, making them vulnerable to the influence of the external environment and resulting in the loss of superhydrophobic properties, which hinders their long-term use and practical application. In order to extend the service life of superhydrophobic coatings, on the one hand, the micro-nano structure stability and the self-healing property of the coating surface are given. Therefore, developing self-healing superhydrophobic coatings is currently a hot research direction. However, due to the health hazards of fluorides, the unsustainability of petroleum-based materials, and the difficulty of autonomous response, the current self-healing superhydrophobic coatings still cannot be widely applied. Firstly, based on the theory and application of superhydrophobic coatings, the repair mechanism of self-healing superhydrophobic coatings is introduced. The self-healing mechanisms are divided into exogenous self-healing and intrinsic self-healing. According to the different loading methods of the healing agents, common exogenous self-healing can be further classified into microcapsule loading and porous material loading. Intrinsic self-healing can be divided into reversible covalent bond and reversible non-covalent bond self-healing. The ways to repair coatings based on reversible covalent bond interactions include Diels-Alder reactions, disulfide bonds, and imine bonds, etc. The self-healing of superhydrophobic coatings based on non-covalent bonds is mainly achieved through hydrogen bonds and metal coordination, etc. According to the principle of superhydrophobicity, the failure forms of superhydrophobic coatings are classified into three categories:the loss of superhydrophobicity due to the increase in surface energy of the coating, the inability to maintain superhydrophobicity due to the destruction of the coating structure, and the simultaneous occurrence of structural damage and increase in surface energy in superhydrophobic coatings. For different failure forms, different countermeasures are summarized to restore low surface energy and microstructure. In addition, due to the increasingly serious ecological and environmental problems, the design strategies of self-healing superhydrophobic coatings with practical application values are reviewed in detail, including non-fluorinated design of coating materials, design of bio-based superhydrophobic materials, and self-healing superhydrophobic coatings with self-response. Finally, the applications of self-healing superhydrophobic coatings in anti-icing, oil-water separation, and anti-corrosion are summarized. The key experimental research and main findings of self-healing superhydrophobic materials are reviewed, and the self-healing superhydrophobic materials, coating preparation methods, and self-healing mechanisms are introduced in detail. Finally, the challenges and future research directions of self-healing superhydrophobic coatings are pointed out. |
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