University of Belgrade, Faculty of Forestry, Kneza Višeslava 1, 11030 Belgrade, Serbia.
Colloids Surf B Biointerfaces. 2013 Aug 1;108:152-7. doi: 10.1016/j.colsurfb.2013.02.045. Epub 2013 Mar 14.
The possibility of photochemical improvement of color stability by UV-irradiation treatment at coating-wood biointerfaces was investigated. The surface of beech wood was partially delignified by exposure to UV-irradiation by passing of samples under UV lamps: a mercury (Hg) lamp with a peak wavelength of 366nm, a gallium (Ga) lamp with peak wavelengths at 410 and 420nm and a combination of a mercury and a gallium (Hg+Ga) lamp. After UV-irradiation, the samples were coated with a UV-curable acrylic coating. The number of passes under the lamps was varied to determine the optimum combination of the number of passes and the lamp type that produces the smallest change in color of the coated wood in an indoor environment. The coated samples that had been UV-irradiated by passing 15 times under both an Hg lamp and a Ga lamp showed the smallest change in color (decrease in the ΔE by 23.23% compared to the untreated coated samples) after 72h of accelerated artificial sunlight exposure. Microscope images of the same samples showed deformation of the cells in wood surface layer and a roughening of the ‟wood-coating line", which could be related to a partial removal of lignin. These findings suggest that delignification of wood leads to more photo-stable polymer-wood interfaces in terms of color.
研究了在涂层木材生物界面处通过 UV 辐射处理进行光化学改善颜色稳定性的可能性。通过在 UV 灯下通过样品的传递使山毛榉木材的表面部分脱木质素：汞（Hg）灯的峰值波长为 366nm，峰值波长为 410nm 和 420nm 的镓（Ga）灯以及汞和镓的组合（Hg+Ga）灯。UV 辐射后，将样品用可 UV 固化的丙烯酸酯涂层涂覆。通过改变通过灯的次数来确定最佳的通过次数和灯类型的组合，以在室内环境中使涂覆木材的颜色变化最小化。在通过 Hg 灯和 Ga 灯各通过 15 次进行 UV 辐射的涂覆样品在加速人工阳光暴露 72 小时后显示出最小的颜色变化（与未处理的涂覆样品相比，ΔE 降低了 23.23%）。相同样品的显微镜图像显示木材表面层的细胞变形和“木材-涂层线”的粗糙化，这可能与木质素的部分去除有关。这些发现表明，就颜色而言，木材的脱木质素会导致更稳定的聚合物-木材界面。
