The Preparation and Performance of Dual‐Resin‐Based Composite Superhydrophobic Coatings

Abstract

ABSTRACT A functionally complementary dual‐resin strategy was developed to regulate wettability and mechanical durability in superhydrophobic coatings. High‐impact polystyrene (HIPS) and organic silicone resin (OSR) formed the composite matrix, and coatings with different HIPS/OSR ratios were fabricated by one‐step spraying at a constant fluorinated nano‐SiO 2 loading. SEM/EDS, surface roughness, and XPS analyses indicated that increasing the OSR proportion reduced smooth HIPS‐rich domains, promoted continuous OSR/fluorinated‐silica‐rich micro‐nanostructures, and increased surface fluorine exposure, thereby increasing the water contact angle and decreasing the sliding angle. Mechanical tests revealed a composition‐dependent trade‐off: HIPS‐rich coatings showed smaller contact‐angle losses, whereas OSR‐rich coatings better retained low sliding angles after damage. The 1:2 HIPS/OSR coating achieved the highest initial water repellency (158.85° contact angle; 5.55° sliding angle), remained stable after acidic and alkaline immersion, delayed complete freezing to 1260 s at −15°C, exhibited effective self‐cleaning, and maintained approximately 96% oil–water separation efficiency over 5 cycles. These results establish a composition–structure–surface chemistry–performance relationship and identify resin composition as a practical design variable for balancing water repellency and mechanical durability.