Preparation of Robust Hydrophobic Epoxy Coating by Template Method
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摘要: 选用综合性能优异的环氧树脂为基体，通过复型氯化钠辅助刻蚀的有机硅树脂模板，制备了疏水性环氧涂层。研究了氯化钠浓度、喷涂次数对涂层微结构和润湿性能的影响。结果表明：随着氯化钠质量分数和喷涂次数的增加，环氧涂层表面逐渐形成了阶梯状的多级粗糙结构，疏水性明显提高，表面接触角从未改性前的80.2°提高至130.0°；涂层具有优异的耐强酸和强碱性能；经过50次摩擦实验后，疏水性未发生改变；多孔有机硅模板在20次浇注-脱模循环后形貌保持完好，可以重复使用。Abstract: A hydrophobic coating was prepared via a simple NaCl-dissolution-assisted etching silicon template method. Epoxy resins with excellent properties were selected as the matrix. The effect of sodium chloride concentration and spraying times on the microstructure and wetting properties of the coatings were studied. The results showed that a multi-stepped rough structure was formed gradually with the increase of salt concentration and the spray times. After using saturated salt solution spraying 30 times, the water contact angle (WCA) of the surface increased from 80.2° to 130.0°, indicating its good hydrophobicity. Besides, the epoxy coating showed superior abrasion resistance and chemical stability for strong acid and alkali solutions. Even after 50 times of abrasion test, the hydrophobicity of the surface showed ignorable variations. Furthermore, the morphology of the prepared porous silicone template retained well after 20 cycles of pouring-demoulding, indicating its excellent reusable performance.
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Key words:
- hydrophobicity /
- template method /
- etching /
- epoxy coating
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图 1 刻蚀后的有机硅模板表面的EDS图谱（a）和SEM图像（b）
Figure 1. EDS analysis result (a) and SEM image (b) of organosilicone template surface after etching
图 2 20次浇注-脱模循环后的有机硅模板表面（a）和环氧涂层表面（b）的扫描电镜图像
Figure 2. SEM image of organosilicone template surface (a) and epoxy coating (b) after 20 cycles of pouring-demoulding
图 3 不同质量分数氯化钠溶液及喷涂次数的环氧涂层的SEM图像
Figure 3. SEM images of epoxy coatings with different sodium chloride mass fraction and spray times
图 4 饱和氯化钠溶液喷涂30次，刻蚀后的有机硅树脂单孔（a）和环氧涂层表面单颗粒（b）的扫描电镜图像
Figure 4. SEM image of single hole of organosilicone resin (a) and single particle of epoxy coating surface (b) sprayed with saturated sodium chloride solution 30 times
图 5 氯化钠溶液质量分数及喷涂次数对环氧涂层接触角的影响
Figure 5. Effect of sodium chloride solution mass fraction and spray times on static contact angle of epoxy coatings
图 6 磨损次数对环氧涂层表面接触角的影响（a）和50次磨损实验后环氧涂层表面的SEM图像（b）
Figure 6. Effect of wear times on the static contact angle of epoxy coating (a) and SEM image of epoxy coating surface after 50 wear times (b)
图 7 磨损对颗粒复合法（a）和模板法（b）制备的涂层表面微结构的影响
Figure 7. Effect of wear on surfaces with microstructures by particle composite method (a) and on the template method (b)
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