Synthesis and properties of transparent superhydrophobic and oleophobic coatings

The uniform coatings were obtained by spraying nanosilica particles and polymer suspensions into surfaces of different substrates based parts with complicated shapes.The effects of SiO2 amounts on properties of surface coatings were investigated.It was shown that the water contact angles measured on the surface of coatings were larger than 150°,while the oil contact angles were higher than 90°,implying the superhydrophobic and oleophobic surface coatings.In addition,the coatings showed excellent transparencies.The hardness and adhesion of the coatings reached the highest levels of 6H and 5B,respectively,under the international standards of ASTM D3363-05 and D3359-09.The hydrophobicity,oleophobicity,and transmittance of surface coatings were enhanced by the additions of appropriate amounts of nanosilica particles.