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    Description

    In recent years, there has been increased interest in the use of inorganic UV blocking nanoparticles for photostabilization of wood surfaces. Photostability and moisture uptake properties of wood veneers coated with a combination of hybrid inorganic-organic thin sol-gel films and organic light stabilizers was investigated. The light stabilizers were applied by brushing, and the thin sol-gel films were deposited on the wood surface by dipping in a sol prepared from a mixture of methyltrimethoxysilane, hexadecyltrimethoxysilane, and aluminum isopropoxide precursors. Although the sol-gel film improved the moisture resistance of the wood veneers, it showed mixed results on photostability. Under light and spray conditions in a Weather-OmeterTM specimens treated with a combination of sol-gel thin film and a UV absorber, tris-resorcinol triazine and an acrylic self-crosslinking binder, or treated with lignin stabilizer/tris-resorcinol triazine/acrylic self-crosslinking binder showed good overall weathering performance. Under permanent light conditions in the Weather-OmeterTM, specimens treated with a combination of sol-gel thin film, a lignin stabilizer, and a water soluble UV absorber – namely: (2-hydroxyphenyl)-benzotriazole – revealed a good overall weathering performance. This study has demonstrated the feasibility of using a combination of organic light stabilizers and sol-gel deposits of hybrid inorganic-organic thin films to improve weathering resistance of softwood substrates.

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    Citation

    Tshabalala, Mandla A.; Libert, Ryan; Schaller, Christian M. 2011. Photostability and moisture uptake properties of wood veneers coated with a combination of thin sol-gel films and light stabilizers. Holzforschung. 65(2): 215-220.

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    Keywords

    Wood surfaces, wood deterioration, coatings, thin films, moisture, water repellents, wood moisture, surface chemistry, weathering, color fading, ultraviolet radiation, veneers, veneering, aluminum, crosslinking, lignin, resorcinol, Pinus radiata, sol-gel deposition, moisture content, methyltrimethoxysilane, resistance to decay, wood decay, durability, discoloration, photostabilizers, hexadecyltrimethoxysilane, aluminum isopropoxide, softwoods, radiata pine, hybrid inorganic-organic thin films, light stabilizers, sol-gel precursors, UV absorber, weathering, wood coatings

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https://www.fs.usda.gov/treesearch/pubs/38666