自相似双层结构自修复超疏水涂层的制备及性能

目的研究自修复超疏水复合涂层的制备工艺及自修复性能。方法将环氧树脂、中性硅酮胶和疏水纳米SiO₂混合制得涂料底层,纳米SiO₂与无水乙醇混合得到涂料面层,采用两步浸涂法在载玻片表面制备出具有自修复功能的自相似双层超疏水涂层。利用扫描电子显微镜、傅里叶变换红外光谱仪和接触角测量仪,对复合涂层的微观形貌、分子结构和润湿性进行了表征。考察了复合涂层的机械稳定性、耐酸碱能力、自清洁能力、耐水冲击能力和自修复机理。结果制备的双层超疏水涂层具有良好的超疏水性能和自修复能力。涂层静态水接触角达到156°±1.8°,经过30个机械磨损循环后,表层被彻底破坏露出底层,此时涂层接触角为125°±1°,通过在130℃环境下加热1 h,涂层的接触角达到157°±1.6°,恢复超疏水能力;同时,所制备涂层拥有优异的耐酸性和自清洁能力,并具有碱性破坏以及水冲击破坏后的自修复能力。结论自相似双层结构的构建使超疏水涂层拥有自修复能力,有效提高了超疏水涂层的耐磨能力、耐腐蚀能力和耐水冲击能力。

Preparation and Performance of Self-repairing Superhydrophobic Coating with Self-similar Double-layer Structure

The work aims to preparation prepare a self-repairing superhydrophobic coating with a self-similar double-layer structure.The epoxy resin,neutral silicone glue and hydrophobic nano-SiO₂are mixed to prepare the coating bottom layer.Nano-SiO₂is mixed with absolute ethanol to obtain the coating surface layer.A two-step dip coating method is used to prepare a self-healing function on the surface of the slide self-similar double-layer superhydrophobic coating.The microscopic morpho-logy,molecular structure and wettability of the composite coating were characterized by scanning electron microscope,fourier transform infrared spectroscopy and contact angle measuring instrument.The mechanical stability,chemical stability and self-cleaning ability of the composite coating were investigated.The results showed that the prepared double-layer superhydrophobic coating has good superhydrophobic properties and self-repairing ability.The static water contact angle of the coating reaches 156°±1.8°.After 30 cycles of mechanical abrasion,the surface layer is completely destroyed and the bottom layer is exposed.At this time,the coating contact angle is 125°±1°.By heating at 130℃for 1 h,The contact angle of the coating reaches 157°±1.6°,and the superhydrophobic ability is restored;at the same time,the prepared coating has excellent acid resistance and self-cleaning ability,and has the self-repair ability after alkaline damage and water impact damage.In conclusion,the construction of the self-similar double-layer structure enables the superhydrophobic coating to have self-repairing ability,which effectively improves the wear resistance,corrosion resistance and water impact resistance of the superhydrophobic coating.