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Pad dyeing of cotton fabric with vegetable indigo

Jing Pang

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Abstract

Pad dyeing of cotton fabric with vegetable indigo is studied.The results show that the optimum reduction process is the ratio of plant indigo:sodium hydroxide:sodium dithionite of 2:3:9,reduction at 45 ℃ for 20 min.The amount of sodium dithionite increases by 50% compared with that of synthetic indigo process.The optimum pad dyeing process for vegetable indigo is the concentration of NaCl 60 g/L,dyeing time 20 s,oxidizing time 2 min,padding 12～14 times.The optimum pad dyeing process for synthetic indigo is dyeing time 20 s,oxidizing time 3 min,padding 12～14 times.The soaping fastness of cotton yarns dyed with vegetable indigo is similar to that with synthetic indigo.

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What this paper is about

Pad dyeing of cotton fabric with vegetable indigo is studied.The results show that the optimum reduction process is the ratio of plant indigo:sodium hydroxide:sodium dithionite of 2:3:9,reduction at 45 ℃ for 20 min.The amount of sodium dithionite increases by 50% compared with that of synthetic indigo process.The optimum pad dyeing process for vegetable indigo is the concentration of NaCl 60 g/L,dyeing time 20 s,oxidizing time 2 min,padding 12～14 times.The optimum pad dyeing process for synthetic indigo is dyeing time 20 s,oxidizing time 3 min,padding 12～14 times.The soaping fastness of cotton yarns dyed with vegetable indigo is similar to that with synthetic indigo.

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Available abstract

Pad dyeing of cotton fabric with vegetable indigo is studied.The results show that the optimum reduction process is the ratio of plant indigo:sodium hydroxide:sodium dithionite of 2:3:9,reduction at 45 ℃ for 20 min.The amount of sodium dithionite increases by 50% compared with that of synthetic indigo process.The optimum pad dyeing process for vegetable indigo is the concentration of NaCl 60 g/L,dyeing time 20 s,oxidizing time 2 min,padding 12～14 times.The optimum pad dyeing process for synthetic indigo is dyeing time 20 s,oxidizing time 3 min,padding 12～14 times.The soaping fastness of cotton yarns dyed with vegetable indigo is similar to that with synthetic indigo.

Key concepts: Indigo, Dyeing, Sodium dithionite, Sodium hydroxide, Pulp and paper industry, Oxidizing agent, Padding, Chemistry

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