Green route to prepare robust and multifunctional superhydrophobic coatings

Superhydrophobic SiO2 was rapidly synthesized from commercial SiO2 (KH550–SiO2) at room temperature by innovatively using ultrasound-assisted ball milling. Characterization results showed that N-octyltriethoxysilane was grafted onto KH550–SiO2 via multiple forces. Superhydrophobic paints were prepared by introducing epoxy resin as a binder. The preparation process is fluorine-free and green. Superhydrophobic paints can easily establish superhydrophobic coating on different substrates through multiple routes, and the prepared coating highlights excellent hydrophobicity, mechanical stability, and durability. Furthermore, the superhydrophobic coating displays superior self-cleaning, antifouling, oil-water separation, and load-increasing properties. We are sure that this work provides a novel green, fast, and scalable route for the synthesis of superhydrophobic nanoparticles. Also, it can promote the engineering applications of superhydrophobic coating.