Preparation and Properties of Superhydrophobic Composite Coatings of SiO2 Nanoparticals/Silicone Resin

doi:10.7517/j.issn.1674-0475.2011.05.372

Abstract

Abstract: SiO₂ nanoparticals/silicone resin composite coatings were prepared by spray-coating,which exhibit superhydrophobicity.Effects of the contents of SiO₂ and silicone resin were investigated preliminarily on the hydrophobic properties of coatings.The results indicate that the water contact angle of composite coatings increases with increase of the content of SiO₂.When the mass percentage of SiO₂ is more than 3wt%,the composite coatings exhibit superhydrophobicity.Meanwhile the mass percentage of silicone resin is 7wt%,the composite coating has a high water contact angle of 151.6 and a small sliding angle of nearly 0.The surface morphologies of coatings were observed by scanning electron microscopy(SEM).It was found that the superhydrophobic composite coating has a rough micro-nanoscale hierarchical structure,with all near-spherical papillas(d≈5 μm) covered by aggregated nanoparticles(d≈50 nm).Such lotus leaf like micro-nano hierarchical structure in combination with the low surface energy of silicone resin renders the coating surface superhydrophobicity.

Key words: spray-coating, silicone resin, composite coating, superhydrophobicity, micro-nano hierarchical structure, contact angle, sliding angle

CLC Number:

WANG Dong, HE Jun-hui, LIU Hong-ying. Preparation and Properties of Superhydrophobic Composite Coatings of SiO₂ Nanoparticals/Silicone Resin[J]. Imaging Science and Photochemistry, 2011, 29(5): 372-382.

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Preparation and Properties of Superhydrophobic Composite Coatings of SiO₂ Nanoparticals/Silicone Resin

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