Sulfur black dyeing process with environment friendly reducing agent

In order to solve the serious polluting and unstable dyeing in the traditional sulfur black dyeing process, the composite reducing agent D was used as a sulfur black BR reducing agent to dye cotton yarns, and the dyeing performance and cleanliness of traditional alkali sodium were compared. The effects of mass concentrations of sulfur black BR, sodium hydroxide, composite reducing agent D, and dyeing temperature on the dyeing properties were analyzed. The experimental results show that under the conditions of mass concentrations of sulfur black BR 60 g/L, sodium hydroxide 20 g/L, composite reducing agent D 19 g/L, and dyeing temperature 95℃, the apparent color depth (K/S)value of the yarn is 46.88, the soaping fastness reaches 4-5, the dry rubbing fastness is 4 and the wet rubbing fastness is 2. The composite reducing agent D as a reducing agent is compared with the traditional sodium sulfide, and the K/S value of the yarn dyed with composite reducing agent D is better than that of with alkali sulfide process. The reducing sulfur element in the dyeing solution is reduced by 78.0%, and the chemical oxygen demand in the machine waste solution is reduced by 76.4%. Copyright No content may be reproduced or abridged without authorization.