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Optimization of Cellulose Dyeing with Natural Indigo: Ramie dyeing by One-step Reduction/dyeing Process

천연인디고를 이용한 셀룰로오스계 직물 염색의 표준화 연구: 일단계 환원/염색에 의한 마직물 염색

  • Son, Kyung-Hee (Dept. of Clothing & Textiles/Human Ecology Research Institute, Chonnam National University) ;
  • Shin, Youn-Sook (Dept. of Clothing & Textiles/Human Ecology Research Institute, Chonnam National University) ;
  • Yoo, Dong-Il (Dept. of Polymer and Fiber System Engineering, Chonnam National University)
  • 손경희 (전남대학교 의류학과/생활과학연구소) ;
  • 신윤숙 (전남대학교 의류학과/생활과학연구소) ;
  • 류동일 (전남대학교 고분자.섬유시스템공학과)
  • Received : 2010.09.15
  • Accepted : 2010.11.12
  • Published : 2011.04.30

Abstract

One-step reduction/dyeing method was applied for ramie dyeing with natural indigo powder. The effect of reduction/dyeing conditions including the pH of bath, dye temperature and time, and concentration of indigo powder and reduction agent on dye uptake and color properties were investigated. Regardless of addition of alkali, the dyed fabrics appeared in the PB Munsell color range(${\lambda}_{max}$: 660 nm) and the dye uptake was much higher with no addition of sodium hydroxide. Dyeing was carried out through the use of only sodium hydrosulfite in the bath. The maximum dye uptake was obtained at 60 for 30min. Saturated dye uptake was obtained at 2 g/L of sodium hydrosulfite concentration up to 2 g/ L of indigo powder. Whereas, at higher indigo powder concentration (4 g/L), more than 3 g/L of reducing agent concentration was required for obtaining the saturated dye uptake. Color reproducibility was reliable with color difference in the range of 0.03~0.16. Regardless of color strength, fastness to rubbing was acceptable with a 3/4~4/5. Fastness to washing, dry cleaning, and light of samples with low color strength were poor. Whereas, fastness to washing, dry cleaning, and light of samples with high color strength were very good.

Keywords

Natural indigo;Ramie;Reduction/dyeing;Reproducibility;Colorfastness

Acknowledgement

Supported by : 한국연구재단

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