Sulphur dyes generate hues that are reasonably affordable, washable, and lightfast while being non-ionic, having sulphur linkage, and being water-insoluble. Dyes with an affinity for cellulose are applied in reduced and solubilized anionic states. Following dyeing, oxidation is done to return the non-ionic dye to its original form. Sulphur dye and cellulose are physically attached, and dye aggregation takes place right there on the spot. Because there is loose sulphur present, stored colored cellulose is more likely to be offered in a humid environment. The most efficient reducing/solubilizing agent, sodium sulfide, pollutes wastewater and must be replaced with alternate reducing systems including glucose, hydroxyacetone, and reducing sugar.
The key traits in this instance of sulphur dyeing are listed below.
- Oxidation chemical treatment is necessary for the development of color and shade.
- Deep shade colors are more frequently dyed with sulfur.
- Washing fastness is good due to the size of the sulphur dye particle, which makes it insoluble in water
- In the case of sulphur dyes, the treatment of dilute aqueous Na2S transforms the dye particle of the sulphur dye into leuco form.
- After being dyed, sulphur dyes are reoxidized by air.
- In sulphur dyeing, hydrogen peroxide is also employed for oxidation.
- No longer an expensive technique; sulphur dyes are dyed at 90–100°C. read more crucial articles, like those on reactive dye.
• The procedure of sulphur dyeing is not more expensive for textiles.
• Sulphur dyes can result in deeply shaded products.
• Sulphur dyes are additionally utilized in printing.
• Wash and light fastness are both good.
• The dyeing procedure uses less energy.
• The manufacturing procedure is simple; sulphur dyes are available in powder or liquid form.
• The growth of light fastness necessitates the usage of some beneficial substances.
• The final shade development requires after treatment.
• Instead of being used directly for dyeing, sulphur dyes are changed into leuco form by combining them with beneficial chemicals such as diluted aqueous Na2S.
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