Polysilazane-Cross-Linked Acrylic Coatings for Wood: A Versatile Solution for Weather Resistance, Stain Repellence, and Fire Safety

Abstract

Acrylic-based wood coatings are widely recognized for their durability, UV resistance, flexibility, and rapid drying times, typically achieved by using isocyanate-based curing systems despite their inherent toxicity. Herein, a novel approach is presented that utilizes polysilazane (PSZ) as an alternative cross-linker to develop advanced acrylic coatings for wood applications. The incorporation of PSZ introduces significant improvements in structural and functional performance, including enhanced hydrophobicity, excellent weather resistance, and self-cleaning properties. Silica (SiO₂) nanoparticles are integrated into the system to synergistically boost flame retardancy, achieving a V0 rating, while further augmenting the surface’s low-energy characteristics. The resulting coatings exhibit a high-gloss, ultrasmooth finish with outstanding environmental barrier properties, effectively resisting stains, water, and harsh weather conditions. The PSZ-modified silica network fosters the formation of a low-energy surface, facilitating ease of cleaning and long-term antistaining performance. Furthermore, the coatings demonstrate exceptional thermal stability and flame resistance, validated through rigorous experimental evaluations. This innovative use of PSZ as a cross-linker not only offers an alternative to traditional isocyanate curing agents but also enhances the overall structural and functional capabilities of wood coatings. These advancements establish a high-performance solution with strong potential for commercialization in demanding wood protection applications.