模拟光老化研究黄色植物染料染色丝绸的光致褪色

Research on simulated photo-degradation of silks dyed with natural yellow plant dye stuffs

为了科学评价照明光源对黄色植物染料染色丝绸的褪色影响,也为了给博物馆此类丝绸文物展陈的照明设计提供合理化建议,通过设计光照老化实验的方法模拟丝绸文物的光老化过程,研究了卤素灯、荧光灯及LED对黄檗、槐米等黄色植物染料染色的丝绸样品的褪色影响。结合色差分析,从染料耐光牢度、样品反射光谱及光源发射光谱等多个角度对染色丝绸的褪色进行了分析。借助液相色谱分析了光老化前后染料成分的变化。结果显示,含蓝光能量高的荧光灯和LED对黄色染料的损伤严重,蓝光能量少的卤素灯影响较小;色谱分析确定了染料的光老化前后的有效成分,推测了光老化反应的褪色机理。

To evaluate the fading of dyed silk scientifically, and to provide valuable lighting design suggestions to museums that exhibit this sort of artifact, light aging tests were designed to study the photo - degradation effects of different lighting sources. The light fastness of silk dyed with natural plant yellow dyes （berberine and pagoda tree buds） was tested under three commonly used museum lighting sources （ LED lamp, fluorescent lamp and halogen lamp）. Chromatic difference analysis and high performance liquid chromatography （HPLC） were used to analyze the silk samples after light exposure. The results show that the halogen lamp cause the least fading of the dyed yellow silk samples, i. e. , lower than the common LED lamp and the fluorescent lamp. The main components of the dyes before and after light aging were analyzed by HPLC, and degradation mechanisms are proposed.