Nanofunctionalized composite-crosslinked epoxy resin for eco-friendly and robust superhydrophobic coating against contaminants

Superhydrophobic coatings are widely used in daily life and industrial applications due to their low adhesion and efficient antifouling properties. However, their eco-friendliness and robustness in high-demand environments are still inadequate for real-world applications. In this work, we report a facile method for preparing an eco-friendly and robust superhydrophobic coating (ERSC) by using a hydrophobic nano-TiO2/polydimethylsiloxane composite cross-linked epoxy resin. The micro/nano rough structure of the ERSC surface shows good water-repellent behavior, with a water contact angle of 168.7 degrees and a sliding angle of 2.8 degrees. This coating can withstand repeated rubbing with a finger, repetitive scratching with a knife, 60 peel-off cycles with tape, and 88 abrasion cycles with sandpaper. None of these physical abrasion methods affect the superhydrophobicity of the coating. The coating is also highly stable to acid, base, and salt treatments. Moreover, the ERSC surface directly repels the adhesion of water-based mixed liquids (such as muddy water, Coca-Cola, pig blood, and milk) and also indirectly removes solid contaminants via water droplets, exhibiting a highly efficient antifouling ability. This simple, scalable, and effective antifouling coating system shows great promise for use in various harsh environments.

Automated summary

In this study, a facile method for preparing an eco-friendly and robust superhydrophobic coating (ERSC) was developed. This coating exhibited good water-repellent behavior and efficient antifouling ability, showing great promise for use in various harsh environments.