Fluorine-free superhydrophobic coatings from montmorillonite

In a current study, durable superhydrophobic coatings were prepared by modifying montmorillonite with stearic acid and organosiloxane.

Water droplet bounces off a surface.
The as-prepared superhydrophobic coatings showed excellent wear resistance. Source: K.-U. Häßler – stock.adobe.com. -

This procedure was simple, efficient, and environmentally friendly. Different from the previously reported methods, the micro-/nanostructures of the superhydrophobic coatings were constructed by using the abundant natural montmorillonite as the building blocks. The surface topography of the coating was analysed with a scanning electron microscope, while element compositions and functional groups were characterised by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, respectively.

Good wear and acid resistance and anti-UV properties

The as-prepared superhydrophobic coatings showed excellent wear resistance, and could maintain their superhydrophobicity after sandpaper abrasion for 180 cm in length. Apart from the superb wear resistance, the obtained superhydrophobic coatings also displayed strong acid resistance and anti-UV properties. In addition, the as-coated fabric not only possessed superhydrophobicity and the ability of oil–water separation, but also exhibited excellent fire resistance because of the thermal stability of MMT particles. Notably, the favourable comprehensive performance of the as-prepared coatings was indicative of their potential applications in oil/water separation and some harsh conditions, and as outdoor protective materials.

The study is published in: Journal of Coatings Technology and Research, July 2019, Volume 16, Issue 4, pp 1043–1053.

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