Preparation and properties of bionic superhydrophobic coating with"concave and convex gully"structure like foot of water strider
A bionic superhydrophobic coating with"concave and convex gully"structure,which is like foot of water strider,was developed on the epoxy/gutta-percha varnish surface using palygorskite powder as functional pigment and mixture of epoxy resin E-44 and gutta-percha as film-forming material,and characterized by SEM,FTIR,XRD.The C3 coating,prepared with 25%(mass fraction)of palygorskite powder was then evaluated for its water contact angle,water rolling angle,self-cleaning capacity,wettability,wear resistance and water resistance.The results showed that the C3 coating displayed obvious"concave and convex gully"structure,with the average static and dynamic water contact angle of 153.1° and 152.6°,respectively,the water rolling angle of 8.8°,and excellent self-cleaning performance.Meanwhile,the C3 coating showed excellent wettability resistance to mud slurry,methyl orange solution and methylene blue solution,with all contact angles above 150°.Moreover,the C3 coating exhibited good substrate applicability,and super hydrophobic properties on the surface of concrete,fabric,paper and plastic.After 50 times of cyclic polishing with 100 g A4 paper,the coating still retained a water contact angle as high as 151.9°,showing good wear resistance.After soaked for 18 and 24 h,the C3 coating displayed water contact angle of 152.2° and 144.4°,respectively.
bionic superhydrophobic coating"concave and convex gully"structurepalygorskite powdergutta-perchafunctional materials
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