目的 制备出具有良好耐久性的超疏水涂层。方法 将苯基有机硅树脂和环氧树脂相结合,并加入羟基封端的聚二甲基硅氧烷疏水改性的纳米二氧化硅颗粒。采用简单的一步法在304不锈钢表面制备出具有优异性能的超疏水涂层。利用摩擦磨损实验模拟实际工况下涂层所遭受的机械摩擦作用,通过胶带剥离实验考察涂层与基底之间的附着牢固程度,以此综合评价超疏水涂层的机械稳定性;借助热老化和光老化实验,分别模拟高温环境和紫外线辐射等自然老化因素对涂层的作用,进而评估超疏水涂层的抗老化性能;通过电化学工作站对超疏水涂层的防腐蚀性能进行了测试。结果 当环氧树脂与苯基有机硅树脂含量为4∶3（质量比）时涂层表现出最佳的疏水性,疏水角为155.3°,滚动角为3.6°。同时超疏水涂层表现出优异的机械稳定性和耐久性,经过1000目砂纸摩擦磨损14 m、胶带剥离30次和紫外线照射96 h后涂层表面水接触角依然大于150°。电化学测试表明该涂层具有优异的防腐效果,腐蚀电流密度相比于环氧树脂涂层降低了2个数量级,防腐效率达到99.8%。结论 加入苯基有机硅树脂后,超疏水涂层机械稳定性和耐久性明显改善,涂层防腐效率也有所提升。
Abstract
Superhydrophobic coating has a wide application prospect in the fields of anti-ice, anti-fog, self-cleaning, oil-water separation, etc. But its durability is the key factor affecting its practical application. Epoxy resin (EP) has excellent physical and mechanical properties and adhesion properties, and is widely used in the preparation of superhydrophobic coatings. Phenyl silicone resin (SI) is a kind of material with excellent properties such as low surface energy, high weather resistance, hydrophobicity and corrosion resistance. On the surface of some complex substrates, it can fill the tiny gap between the super-hydrophobic micro-nano structure and the substrate, which helps to enhance the adhesion. In this study, a mechanically robust superhydrophobic coating is prepared by a simple one-step brush method by combining phenyl silicone resin with epoxy resin and adding Hydroxy-terminated polydimethylsiloxane (OH-PDMS) modified nano-silica particles. The structure changes of SiO2 nanoparticles and superhydrophobic coatings before and after modification are analyzed by Fourier transform infrared spectroscopy. The surface of the superhydrophobic coating with different contents of phenyl silicone resin is observed by field emission electron microscopy. The mechanical stability and durability of the superhydrophobic coating are evaluated by the experiments of friction and wear, tape stripping and acid-alkali corrosion. The corrosion resistance of the coating is tested by electrochemical workstation. The results show that compared with the infrared spectrum of unmodified SiO2, the modified SiO2 has a methyl absorption peak at 2 960 cm-1, and the presence of methyl indicates that the modified SiO2 nanoparticles are successful. The hydrophobic angle test shows that the coating hydrophobic angle increases first and then decreases with the increase of the content of phenyl silicone resin. When the content of epoxy resin and phenyl silicone resin is 4∶3, the maximum hydrophobic angle reaches 155.3°. It can be seen from the SEM images that there are obvious depressions and protrusions on the coating surface, and the overall structure is valley like. With the increase of the content of phenyl silicone resin, the surface aperture and the depth of the coating decrease gradually, and the hydrophobic angle increases first and then decreases. When the content of epoxy resin and phenyl silicone resin is 4∶3, the hydrophobic angle reaches the maximum value of 155.3°. Wear experiments and tape stripping experiments show that phenyl silicone resin can enhance the bond between coating and substrate, epoxy resin and nanoparticles, and significantly enhance the mechanical stability of the superhydrophobic coating. After 70 times of friction and wear, the water contact angle of the coating surface remains at a high level after 40 times of tape stripping. The presence of Si—O in the superhydrophobic coating makes it have excellent thermal stability and ultraviolet resistance. The coating still has superhydrophobicity after heat treatment at 200 ℃ for 24 h and ultraviolet irradiation for 96 h. Acid-alkali salt soaking shows that the superhydrophobic coating has excellent chemical stability. The electrochemical test shows that the superhydrophobic coating has excellent barrier and anti-corrosion effect, the corrosion current density is 2 orders of magnitude lower than that of the epoxy coating, and the anti-corrosion efficiency reaches 99.8%.
关键词
超疏水 /
润湿性 /
机械稳定性 /
耐久性 /
苯基有机硅树脂 /
SiO2
Key words
superhydrophobic /
wettability /
mechanical stability /
durability /
phenyl silicone resin /
SiO2
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