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Effectiveness of Bark Extracts and CeO2 Nano Particles as Coating Additives for the Protection of Heat-Treated Jack Pine

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Journal of Energy and Power Engineering 2013年第6期7卷 1198-1205页

作者： Duygu Kocaefe Sudeshna Saha Yasar Kocaefe Cornelia Krause andre pichette Yaman Boluk Department of Applied Sciences University of Quebec at ChicoutimL Quebec G7H 2B1 Canada Department of Civil and Environmental Engineering University of Alberta Alberta T6G 2W2 Canada

High temperature heat-treatment of wood, which is value-added green product, is one of the alternatives to chemical treatment. It has better dimensional stability, thermal insulating properties and biological resistance compared to kiln dried wood. It also has dark brown color which is very important for decorative purposes. Unfortunately, this color changes during weathering. Developing a transparent and non-toxic coating for the protection of heat-treated wood against discoloration without changing its natural appearance is the main objective of this study. For this purpose, waterborne acrylic polyurethane base was chosen because of its durability against weathering and non-toxic nature. Natural antioxidants which are extracted from barks and CeO_2 nano particles (alone or together with lignin stabilizer) were used as additives to develop different coatings. The protective characteristics of these coatings were compared with highly pigmented and toxic industrial coating under accelerated weathering conditions. The results showed that acrylic polyurethane coatings protected wood better compared to commercially available coating tested in this study. The chemical modifications during accelerated weathering of coated and heat-treated wood surfaces were monitored by X-ray photoelectron spectroscopy analysis. The morphological changes took place during weathering were studied by fluorescence microscope analysis.

关键词：高温热处理涂料添加剂开发保护纳米粒子树皮丙烯酸聚氨酯涂料氧化铈提取物

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