Effects of Dyeing Conditions of Natural Colorants from Disused Marigold Plants on Dyeability of Silk Fabrics

摘要

Dyeing properties of dyestuff materials from the disused marigold plants were investigated under several dyeing conditions including dye concentration, temperature, and pH on dyeability of silk fabrics. The dyestuff was extracted from the disused marigold plants, spray-dried, and made into powder. The silk fabrics showed yellow surface color even though the surface color differed depending on mordants. The color strength, a and b values were increased as dyestuff concentration and dyeing duration increased, while L values decreased. Especially, the values of a and b were highest at 45 minutes after dyeing. The L value was lower (49.12 to 64.33) at higher dying temperatures of 90 to 100°C than at lower temperatures of 70 to 80 °C. The values of a and b, however, were higher at lower dying temperatures than at higher temperatures. The silk dyed showed the highest AE values and the lowest L values at pH 5, indicating that the silk exhibited thick colors. However, the value b showed the highest levelat pH 7. In conclusion, we validated that the dyestuffs from the disused marigold plants would be useful as a natural dye material using the optimized conditions and dyeability for silk dyeing.