Surface properties of tannin-impregnated and varnished beech wood after exposure to accelerated weathering |
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| Authors: | Mesut Yalcin Huseyin Pelit Caglar Akcay Nevzat Cakicier |
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| Affiliation: | 1. Department of Forest Products Engineering, Faculty of Forestry, Duzce University, 81620 Duzce, Turkey;2. Department of Wood Products Industrial Engineering, Faculty of Technology, Duzce University, 81620 Duzce, Turkey |
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| Abstract: | The aim of this study was to determine selected surface properties of varnished beech wood impregnated with natural extracts after exposure to accelerated weathering. Beech wood samples were impregnated with aqueous solutions of 5 and 10% mimosa (Acacia mollissima) and quebracho (Shinopsis lorentzii) tannins. After weathering, colour changes (ΔL*, Δa*, Δb*, and ΔE*) in addition to scratch resistance and surface hardness values were calculated and evaluated. As a result of the weathering process, greater colour changes (ΔE*) were detected in the beech wood samples impregnated with tannins compared with the unimpregnated control samples. The least colour change occurred in the Tanalith-E-impregnated samples. Total colour change was adversely affected with tannin impregnation after the weathering processes. In terms of surface hardness and scratch resistance, the highest values were observed in the mimosa-solution-impregnated and control samples. Furthermore, it was found that scratch resistance and hardness values tended to increase during the first period of weathering and decreased thereafter. Regarding surface properties, the best results were obtained when polyurethane varnish was employed compared with the other varnish types. |
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