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

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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.