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http://dx.doi.org/10.5658/WOOD.2018.46.3.221

Studies on Photoprotection of Walnut Veneer Exposed to UV Light  

Park, Se-Yeong (Department. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Hong, Chang-Young (Department of Forest Biomaterials, North Carolina State University)
Kim, Seon-Hong (Advanced Industrial Material Team/Research & Technology Division, Ingredient Business Unit)
Choi, June-Ho (Department. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Lee, Hyo-Jin (Surface-Finishing & Fastening Technology Team, Hyundai Motor Company)
Choi, In-Gyu (Department. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.46, no.3, 2018 , pp. 221-230 More about this Journal
Abstract
The purpose of this study was to evaluate the effect of several chemical treatments to prevent photodegradation of wood veneer by external UV (Ultraviolet) light. Of woods, walnut veneer is selected as a raw material for this study since it is known as a luxurious wood with dark color giving an esthetic effect. Alcohol-benzene, hydrogen peroxide ($H_2O_2$) and sodium hypochlorite (NaClO) solution were used for investigate the effect on color stabilization. Despite the removal of the extractive compounds, which is known as a discoloration component, a significant color change of walnut wood veneer was observed. Meanwhile, the veneers treated by 20 and 30% $H_2O_2$ solution at $75^{\circ}C$ for 1 h also showed the no positive effect of color stability exposed to UV light although they have a bleaching effect on wood veneer. Besides, it was difficult to maintain the original color of walnut veneer due to the elution of the extractive compounds. On the other hands, the veneer treated by NaClO solution indicated the good performance on color stability despite of the intensive UV light test. However, when the concentration exceeds 3%, surface roughness and fiber damage occurred simultaneously. Therefore, the walnut species should be treated with proper concentration when sodium hypochlorite is applied to the veneer.
Keywords
wood discoloration; photodegradation; wood veneer; lignin; chemical bleaching;
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