Abstract
Long-term durability and aesthetic design are two highly desirable traits for outdoor-use wooden products and facilities. In this study, Sugi heartwood specimens treated with wood preservatives (AAC, ACQ, CUAZ, AZNA, AZN) were further finished with coatings (film forming type, penetrating type) and subjected to artificial weathering using fluorescent ultraviolet lamps and water (EN 927－6). The weather resistivity of the specimens was then evaluated by examining changes in color, gloss, and waterproof properties. Wood preservatives after weathering were also analyzed both in the outer and inner parts of the specimens. Change in color and decreases in water repellency of the coatings with wood preservatives were found to be lower than in untreated specimens, indicating that the performances of the coatings were enhanced in the presence of the wood preservatives. Leachability of the wood preservatives was found to be reduced with coatings, implying that the wood preservatives also benefitted from being used in conjunction with the coatings. The researchers therefore conclude that wood preservatives and coatings have a synergistic effect for long-term preservation and weatherproofing of wooden materials kept outdoors, when used together.
