Preparation of CNF synergistic enhanced EP/SiO2 superhydrophobic coating by one-step spraying method: achieving wear resistance and strong adhesion function

Superhydrophobic coatings, inspired by lotus leaves, have gained significant interest due to their multifunctional properties. However, their mechanical wear resistance is often inadequate, resulting in a limited lifespan. This study aims to create a wear-resistant superhydrophobic composite coating using epoxy resin (EP) as a binder, along with SiO 2 modified by hexadecyltrimethoxysilane (HDTMS) and cellulose nanofibers (CNF) modified by KH570 to enhance performance synergistically. The preparation method is environmentally friendly and does not involve fluorine chemicals. A simple and efficient one-step spraying technique is employed to create a micro-nano hierarchical structure on the substrate surface. SiO 2 contributes to surface roughness, CNF serves as a toughening agent to form a three-dimensional network, and EP provides strong adhesion. This composite structure significantly improves the mechanical durability of the coating while preserving excellent superhydrophobic properties. The coating is compatible with various substrates and retains good hydrophobicity even after extensive abrasion and tape peeling. Additionally, the superhydrophobic coating demonstrates outstanding anti-fouling and self-cleaning capabilities, resistance to acids and bases, and strong adhesion. We believe this research offers innovative approaches for developing fluorine-free, wear-resistant superhydrophobic coatings.