Textile Coloration and Finishing (한국염색가공학회지)

The Korean Society of Dyers and Finishers (한국염색가공학회)
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Dyeing Properties of Cotton Fabrics Dyed with Extract from Dry Leaf of Indigo Plant

건조 쪽잎 추출액에 의한 면직물 염색성

  • 송성원 (신라대학교 IT디자인대학 패션산업학부) ;
  • 조경래 (신라대학교 IT디자인대학 패션산업학부)
  • Published : 2008.06.27
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Abstract

The purpose of this study is to develop the dyeing method with dry leaves of indigo plant. Coloring matter was extracted from dry leaves of indigo plant with hot sodium hydroxide solution. The extract was reduced with sodium dithionite, and it was used for dyeing cotton fabrics under various conditions. UV-visible absorption spectra of extract, reduction rate of extracts by reducing agent, and the surface color of dyed cotton, lightfastness were examined. For the initial 20 minutes, the absorbance of indigo solution rapidly decreased. However, several hours later, the decreasing rate retarded. By repeating the dyeing process, the shade looked deeper and deeper. At $30-40^{\circ}C$, the value of K/S reached the highest point. The concentration of indigo solution in dye bath seemed to playa critical role for the reaction of the reducing agent. It was observed that the surface color of cotton fabrics was getting bluish and its degree of value and chroma seemed slightly decreased as the K/S value was increasing. The lightfastness was clearly enhanced by increasing the K/S value.

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References

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  1. Study on the Improvement of Dyeability of Commercial Indigo Leaf Powder for the Purpose of Utilizing It in Indigo Dyeing vol.38, pp.4, 2014, https://doi.org/10.5850/JKSCT.2014.38.4.540