The effects of substrate and ultraviolet ray absorbent on the lightfastness of dyed clothes

采用单色和多色辐射方法研究了染色衣物的耐光性。考察了基材和紫外线吸收剂(UVA)对耐光性的影响。这项研究最显著的特点之一是汇编了显示染色材料褪色过程中波长依赖性的作用光谱。结果表明：1.选择了四种分散染料对涤纶服装进行染色。在上述实验技术下，对这些样品进行了检测，以揭示它们的褪色特性。此外，还研究了UVA对染色后样品的防褪色效果。1%OW.F.UVA对涤纶原料上四种分散染料的防效为25%~55%。证实了UVA在紫外光照射下效果较好。此外，还观察到防褪色的效果高于UVA的吸收效率。这一结果被解释为UVA的作用不仅仅取决于紫外线过滤。但部分依赖于控制自由基氧化反应。对JIS蓝标标本进行检验。使用聚酯和尼龙两种材料作为基材。观察了UVA对聚酯材料的防褪色效果。然而，在尼龙试件上，没有观察到UVA效应。认为尼龙的主要褪色机理取决于还原过程，因此可能与控制氧化过程有关的UVA对尼龙的褪色没有影响。

The characteristics of lightfastness of dyed clothes were investigated by the use of monochromatic and multi chromatic radiations. The effects of substrate and ultraviolet ray absorbent (UVA) on the lightfastness were examined. One of the most distinguishable features of this research is the compilation of action spectrum which shows the wavelength dependency in the fading of dyed materials. As a result, the following characteristics were obtained:1. Four kinds of disperse dyes were selected to dye polyester clothes. These specimens were examined to reveal their fading characteristic under the experimental technologies as mentioned above. Moreover, the effect of UVA on the prevention of fading of the dyed specimen was studied. The usage of 1% o. w. f. UVA gave the control effects of 25% to 55% on four kinds of disperse dyes on polyester material. It was confirmed that the effect of UVA was high in the radiation of ultraviolet ray. Further, the prevention effect of fading was observed to be higher than the absorbing efficiency of UVA. This result was interpreted that UVA action is depending not only on UV filtration. but partially on controlling the radical oxidation reaction.2. Specimens of JIS blue scale were examined. Both of polyester and nylon were used as a substrate. The fading prevention effect of UVA was observed on polyester material. However, on the nylon specimens, no UVA effect was observed. It is considered that main fading mechanism on nylon is depending on the reduction and therefore UVA which may be related to control the oxidation process does not give the influence on the fading.