Textile Coloration and Finishing (한국염색가공학회지)

The Korean Society of Dyers and Finishers (한국염색가공학회)
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Eco-friendly Leather Dyeing Using Biomass Wastes(II) : Improving the Dyeability of Pig Leather to Onion Skin Colorant by Pre-treatment

생물자원 폐기물을 활용한 친환경 가죽염색(II): 전처리에 의한 돈피의 양파껍질 색소에 대한 염색성 향상

  • Yeo, Youngmi (Department of Clothing and Textiles/Human Ecology Research Institute, Chonnam National University) ;
  • Shin, Younsook (Department of Clothing and Textiles/Human Ecology Research Institute, Chonnam National University)
  • 여영미 (전남대학교 의류학과/생활과학연구소) ;
  • 신윤숙 (전남대학교 의류학과/생활과학연구소)
  • Received : 2018.11.22
  • Accepted : 2018.12.11
  • Published : 2018.12.27
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Abstract

In this study, eco-friendly natural dyeing for pig leather was explored by using onion skin which is food waste. Sodium caseinate was used as a pre-treatment agent to improve dyeability of pig leather and its effect on dye uptake was investigated according to treatment concentration. Dye uptake of the pre-treated pig leather was increased by about two times compared to untreated one at 0.2% pre-treatment concentration. Onion skin colorant imparted YR color on pig leather. After mordanting, the color of pretreated/dyed pig leather was varied from brick-red to khaki shades. However, mordanting did not improved dye uptake of the pre-treated/dyed pig leather significantly. The color-fastnesses of un-mordanted samples to light, dry cleaning, rubbing were grades 3-4, 5, and 4, respectively, which is good enough to meet all Korean Standard for Fastness of leather products. After mordanting, the light fastness of pig leather was improved to 4, 4-5 grade. The efficacy of sodium caseinate as a pre-treatment agent for pig leather was verified by improved dye uptake and good colorfastness. And, the natural dyeing of pig leather using food waste would be a significant sustainable way in terms of eco-friendliness and reuse of biomass to reduce environmental pollution.

Keywords

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Figure 1. Profile of pre-treatment, dyeing and mordanting.

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Figure 2. FT-IR spectrum of onion skin colorant.

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Figure 3. Chemical structure of quercetin, the main colorant of onion skin.

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Figure 4. Effect of dyeing temperature on the dye up-take of pig leather.

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Figure 5. Effect of colorant concentration on the dye uptake of pig leather.

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Figure 6. Effect of dyeing time on the dye uptake of pig leather.

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Figure 7. Effect of bath ratio on the dye uptake of pigleather.

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Figure 8. Effect of sodium caseinate concentration on the dye uptake of pig leather.

Table 1. Characteristics of pig skin

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Table 2. Image of pig leather taken with scanning electron microscope(×100)

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Table 3. Image of pre-treated pig leather taken with scanning electron microscope(×250)

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Table 4. Effect of post-mordanting on the color of pre-treated/dyed pig leather samples

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Table 5. Effect of post-mordanting on the colorfastness of pre-treated/dyed pig leather samples

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