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Title: Photostability and moisture uptake properties of wood veneers coated with a combination of thin sol-gel films and light stabilizers

Author: Tshabalala, Mandla A.; Libert, Ryan; Schaller, Christian M.;

Date: 2011

Source: Holzforschung. Vol. 65, no. 2 (Mar. 2011): p. 215-220.

Publication Series: Scientific Journal (JRNL)

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.

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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  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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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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