Liu Wenjia, Liu Xinyou, Lv Jiufang
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
College of Furnishing and Industrial Design, Nanjing Forestry University, Str. Longpan No. 159, Nanjing 210037, China.
Materials (Basel). 2023 Aug 13;16(16):5607. doi: 10.3390/ma16165607.
This study investigates the UV degradation of black Chinese lacquer by incorporating carbon black and ferrous hydroxide as additives. The purpose of this research is to understand the effects of these additives on the degradation behavior of the lacquer film. Different concentrations of carbon black powder (1%, 3%, and 5%) and Fe(OH) (10%, 20%, and 30%) were added to the lacquer following traditional techniques. The main methods employed for analysis were gloss loss measurement, color change assessment, SEM imaging, FTIR spectroscopy, and XPS analysis. The results demonstrate a significant decrease in gloss levels and an increase in lightness values with increasing ultraviolet exposure time. SEM images reveal the formation of cracks in the lacquer film. FTIR analysis indicates oxidation of the urushiol side chain and an increase in oxidation products. The infrared difference spectrum highlights the differences between the additives, with Fe(OH) showing a lower impact on the spectra compared to carbon black. XPS analysis confirms the oxidation of the C-H functional group and the presence of C-O-C and C-OH groups. In conclusion, this study sheds light on the influence of carbon black and ferrous hydroxide additives on the UV degradation of black Chinese lacquer and suggests the protective effect of Fe(OH) against UV aging. These findings contribute to a better understanding of the degradation mechanisms and provide insights for improving the UV resistance of Chinese lacquer coatings. Further research can explore alternative additives and optimization strategies to mitigate UV-induced degradation.
本研究通过添加炭黑和氢氧化亚铁作为添加剂来研究中国黑漆的紫外线降解情况。本研究的目的是了解这些添加剂对漆膜降解行为的影响。按照传统工艺向漆中添加不同浓度的炭黑粉（1%、3%和5%）和氢氧化铁（10%、20%和30%）。用于分析的主要方法有光泽度损失测量、颜色变化评估、扫描电子显微镜成像、傅里叶变换红外光谱和X射线光电子能谱分析。结果表明，随着紫外线暴露时间的增加，光泽度显著降低，明度值增加。扫描电子显微镜图像显示漆膜中形成了裂纹。傅里叶变换红外光谱分析表明漆酚侧链发生氧化，氧化产物增加。红外差谱突出了添加剂之间的差异，与炭黑相比，氢氧化铁对光谱的影响较小。X射线光电子能谱分析证实了C-H官能团的氧化以及C-O-C和C-OH基团的存在。总之，本研究揭示了炭黑和氢氧化亚铁添加剂对中国黑漆紫外线降解的影响，并表明氢氧化铁对紫外线老化具有保护作用。这些发现有助于更好地理解降解机制，并为提高中国漆涂层的抗紫外线性能提供见解。进一步的研究可以探索替代添加剂和优化策略，以减轻紫外线引起的降解。
