| 摘要: | 在螢光色當中，由於光學異構化 (Photoisomerization) 的因素，使得螢光增白劑吸收300-400 nm的紫外線轉換發射出420-450 nm長波長的可見光（藍组紫光區），其螢光增白劑的水溶液曝曬在太陽光下，更甚者，在紫外線燈光下，其具螢光性的反式會轉成不具螢光性的順式結構。
我們針對市面上常見的聚酯及尼龍材料，以三種基礎螢光色系作為染色，使用AATCC 16日光牢度標準下進行測試，再使用Datacolor分光儀，進行日光牢度前後的反射率及CIE ΔE值進行比較。
比較無螢光及有螢光色系，有螢光色系日光牢度明顯較無螢光色系較差，這是由於螢光是吸收UV光源以增加其反射率，而其明度也會普遍上升，但是受到過度UV光源曝曬，原本反式的發光團會轉換成順式而失去其光致變色的能力，故與曝曬前樣比較後有明顯的褪色情形。
由於螢光色系染色基光穩度(Photo-Stability)遠比無螢光來的差，其模擬日光曝曬後，染色基的破壞及色光的改變情形，在這篇文章中會加以量化並提供相關測色數據，對於評級的影響，還有後續調整相關染料配方或使用UV吸收劑等改進措施，提供相關參考依據。
Since the fluorescent color Photo-Stability is poor than the non-fluorescent, after which simulate sunlight exposure, dyeing base damage and shade change situations in this article will be quantified and provide Related color measurement data, the impact of the rating, as well as subsequent adjustments related to the use of a dye or UV absorber formulation improvements, provide reference.
We use common market for PET and Nylon material, in three basic colors as fluorescent dye, using AATCC 16 color fastness standards for testing, and then use Datacolor spectrometer, the reflection rate before and after the light fastness and CIE ΔE value were compared.
There were no fluorescent and fluorescent colors, fluorescent colors light fastness have significantly poorer than those without fluorescent color, which is due to fluorescent UV light is absorbed to increase its reflectivity, and its brightness will generally rise , but by excessive exposure to UV light, the original trans lumiphore will be converted into the cis and lose its ability to photochromic, so after sample exposure significantly compared with that before fading scenario.
In the fluorescent color which, since the Photo-isomerization factors such fluorescent whitening agents absorb ultraviolet light emitted conversion 300-400 nm 420-450 nm long wavelength of visible light (blue group purple zone), which firefly optical brighteners in an aqueous solution of exposure to sunlight, or worse still, under ultraviolet light, the fluorescence of a trans will turn into non-fluorescence of cis-structure. |
