In this research, the glue films, ground and paint layers were aged under UV-C radiation. The glue films were prepared using tamarind gum and liang-chey resin powders. The ground (calcium carbonate mixed with tamarind glue) and paint layers (red cinnabar, malachite, Prussian blue mixed with liang-chey resin) were applied on the iron wood using traditional tempera technique. The degree of disintegration was determined using scanning electron microscopy with energy dispersive X-ray instrumentation, thermogravimetric analysis, attenuated total reflectance Fourier transformed infrared spectroscopy and powder X-ray diffraction. The tamarind film turned brown after 14 days. While, liang-chey resin film did not show any significant color change. The thermogravimetric analysis showed the lower thermal stability of the aged tamarind film. The discoloration and cracking on the ground layer surface stemmed from the disintegration of tamarind binder. After 14-day exposure, the color of red cinnabar changed from bright red to dark red with black spots all over the surface. These spots were identified by powder X-ray diffraction measurements as β-HgS (black). After prolonged UV exposure, the white solid was appeared on the cinnabar surface and identified as anhydrite (anhydrous CaSO₄) and gypsum (CaSO₄.2H₂O). The yellow color appeared on the malachite surface might come from the discoloration of the tamarind glue binder in the ground layer. While the brown layer found on aged Prussian blue surface was confirmed as the mixture of β-PbO₂, Pb₃O₄, and β-FeOOH.

中文翻译：

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UV老化过程中柬埔寨面板涂料降解的研究

在这项研究中，胶膜、地面和油漆层在 UV-C 辐射下老化。使用罗望子胶和凉菜树脂粉末制备胶膜。地面（碳酸钙与罗望子胶混合）和油漆层（红朱砂、孔雀石、普鲁士蓝与良柴树脂混合）使用传统的蛋彩画技术涂在铁木上。使用带有能量色散X射线仪器的扫描电子显微镜、热重分析、衰减全反射傅里叶变换红外光谱和粉末X射线衍射测定崩解程度。14天后，罗望子薄膜变成褐色。而良芝树脂膜没有出现明显的颜色变化。热重分析表明老化的罗望子薄膜的热稳定性较低。地层表面的变色和开裂源于罗望子粘合剂的崩解。暴露14天后，红朱砂的颜色由鲜红色变为暗红色，表面布满黑点。这些斑点通过粉末 X 射线衍射测量鉴定为 β-HgS（黑色）。长时间紫外线照射后，朱砂表面出现白色固体，鉴定为无水石膏（无水CaSO₄ ) 和石膏 (CaSO ₄ .2H ₂ O)。孔雀石表面出现黄色可能是由于地面层的罗望子胶粘合剂变色。而在老化的普鲁士蓝表面上发现的棕色层被确认为β-PbO ₂、Pb ₃ O ₄和β-FeOOH的混合物。