Durable Polysilazane–PVDF Coating for Anti-Graffiti, Anti-Icing, and Environmental Protection of Surfaces

Abstract

The growing demand for durable, low-maintenance surfaces in public infrastructure highlights the need for coatings that can withstand environmental stressors while offering anticontaminant functionality. Herein, we develop a multifunctional composite coating based on an acrylic–polysilazane (PSZ)–poly(vinylidene fluoride) (PVDF) system that provides broad-spectrum surface protection. Cross-linking between functional acrylics and PSZ generates a robust siloxane (Si–O–Si) network, imparting excellent thermal stability, chemical resistance, and strong substrate adhesion. The addition of just 5 wt % PVDF significantly lowers surface energy, enhancing hydrophobicity, UV resistance, and antisoiling performance. The resulting coating exhibits high mechanical durability (5H pencil hardness, 5B adhesion grade), maintains structural integrity under 150 cycles of acid rain–UV exposure and thermal cycling from −35 to 60 °C, and achieves notable iceophobicity, with an ice delay time of 590 s and a rapid melting response at 5 °C. Electrochemical impedance spectroscopy reveals a 100-fold increase in corrosion resistance over uncoated metal. Moreover, the surface shows strong anti-graffiti performance, allowing effortless removal of inks, paints, and stains without surface damage. This composite system offers a scalable, cost-effective solution with a simple application and broad substrate compatibility. Demonstrated across metals, ceramics, and composites, it holds promise for protecting building exteriors, transit systems, and public facilities. Its combination of environmental resilience, low maintenance, and contaminant repellence positions it as a high-performance coating for modern infrastructure.

Topics & Concepts