光稳定剂在彩色影像保存中的应用

Application of Light Stabilizer in Color Image Preservation

用不同方法制作的彩色相片或图片,当悬挂在阳光充足的房间里,经过4～8个月就逐渐褪色;彩色幻灯片在标准放映光源下,连续照射半小时就明显褪色。同样,对一些文物的保存和展示过程中,也会遇到类似问题。在彩色影像褪色过程中,红色衰退最快,蓝色次之,绿色最慢。引起彩色影像褪色的原因很多,除了诸多化学结构和制造技术等因素外,其中外界因素主要是紫外线的照射,无处不在的紫外线对彩色影像的破坏是不容忽视的。因此,在彩色影像制品中合理使用紫外线吸收剂,对彩色影像的保存很有意义。本文系统介绍紫外线吸收剂的作用原理,苯并三唑类紫外线吸收剂的结构、相容性、毒性和使用实例。本文也讨论了彩色照片塑封膜材料中使用紫外线吸收剂的必要性。

For color photographs made by different methods, when hanged in bright sunny rooms, the discoloring could happen gradually within 4 to 8 months. Color transparency could be seen discoloring clearly, if under standard lighting source for about half an hour. To certain relics shown in the public, this phenomenon happens similarly. In color image discoloring process, red color goes off the quickest, blue is the second and green is the last. Causing to the discoloring is related to the chemical contents and photographs processing technique. Among the external factors, mainly the ultraviolet radiation plays the important role in discoloring process. Hence ultraviolet absorbent to be applied can improve the color pictures preservation. This article gives a general description of the functions of ultraviolet absorbents, their structures, compatibility, toxic effect, and application examples of ultraviolet absorbents made of benzotriazole class. In the article it also suggests the necessity of applying ultraviolet absorbent in plastic cover films in preservation of color photographs.