Textile Coloration and Finishing (한국염색가공학회지)

The Korean Society of Dyers and Finishers (한국염색가공학회)
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Dyeing Properties and Storage Stability of Leaf Powder Prepared from Dyer's Knotweed(II) - by Hot Air and Room Temperature Drying Methods -

생쪽잎분말의 염색성 및 저장성(II) - 열풍 및 상온건조방법 -

  • Shin, Youn-Sook (Dept. of Clothing & Textiles / Human Ecology Research Institute) ;
  • Son, Kyung-Hee (Dept. of Clothing & Textiles / Human Ecology Research Institute) ;
  • Yoo, Dong-II (School of Applied Chemical Engineering, Chonnam National University)
  • 신윤숙 (전남대학교 의류학과 / 생활과학연구소) ;
  • 손겸희 (전남대학교 의류학과 / 생활과학연구소) ;
  • 류동일 (전남대학교 응용화학공학부)
  • Published : 2009.08.27
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Abstract

The objective of this study is to investigate the efficacy of leaf powder colorants as substitutes for traditional indigo dyeing. Leaf powder colorants were prepared by hot air($50^{\circ}C$) and room temperanrre($25^{\circ}C$) drying methods from fresh leaves. The presence of indigo in the leaf powder colorants was confirmed by UV/Visible absorption spectra. All the powder colorants showed broad absorption at 602 nm as same as synthetic indigo. Dyeing was done by reduction method with sodium hydrosulfite and sodium hydroxide. Leaf powder colorants produced blue color on silk fabrics, showing similar color to the one dyed traditionally with fresh juice extract. The powder colorants prepared at room temperature drying were more stable for long term storage than that prepared by hot air drying. Thus, the powder colorants prepared by room temperature drying was reduced and dyed in one-step process without sodium hydroxide in the dyebath for further investigate dyeing properties. K/S value of the fabric dyed without sodium hydroxide was much higher than one dyed with sodium hydroxide. Regardless of the addition of sodium hydroxide, rubbing fastness was fairly good showing above 4 rating. Fastness to dry cleaning and light of the fabrics dyed without sodium hydroxide were mote higher than that dyed in alkaline condition.

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References

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  3. Fabric Dyeing with Indigo and Japanese pagoda tree for Color mixture (II) － Treatment on Protein Fibers － vol.22, pp.4, 2010, https://doi.org/10.5764/TCF.2010.22.4.306