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Thursday, 24 October 2019
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Raw materials & technologies, Raw materials, Coatings binders

Coating combines super-hydrophobicity and good adhesive strength

Friday, 30 May 2014

A weather resistant super-hydrophobic coating that can offer good substrate adhesion and yet to be easily processed at large scale can be of practical use in self-cleaning and anti-icing paint.

The first layer is based on an epoxy binder for a good adhesion, the second, a polysiloxane layer, offers ultra-hydrophobicity Source: Nanadou-Fotolia.com
The first layer is based on an epoxy binder for a good adhesion, the second, a polysiloxane layer, offers ultra-hydrophobicity Source: Nanadou-Foto...

Combing all these properties together remains a challenging task. A group of Chinese researchers describe a composite coating composed of a fluorinated epoxy resin emulsion with embedded in situ surface-modified dual-scale nano-silica, which displayed durable super-hydrophobicity and excellent adhesive strength. The as-prepared coating possesses water contact angle of 158.6 ± 1°, sliding angle around 3.8 ± 0.2° which remain stable even under acidic/alkaline, heat/cool, and accelerated aging treatment.

Layer endows coating with weather-resistance

The results demonstrate that surface roughness had a micron- and nanometer scale distribution with increased particle loading beyond 40 wt.%. Through quantitative comparison of surface Attenuated Total Reflection (ATR) with bulk FT-IR transmission spectra, a gradient coating with surface enrichment of hydrophobic groups was determined. The air-side fluorinated polysiloxane-rich layer endows coating with weather-resistance and ultra-hydrophobicity while bottom epoxy resin layer enhances substrate adhesion.

The study is published in: Journal of Applied Polymer Science.

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