The production process of sulphur dyes is short, inexpensive, and good fastness. However, due to its many shortcomings and problems in actual production and application, sulphur dyes are still not widely used in various fabrics.
Problems when dyeing:
Sulphur dyes are excess used with sodium sulphide. Some of the sodium sulfide is used for the reduction of dyes, but the excess part will produce sulfur-containing wastewater. The dyeing wastewater has high sulfur content, and the formed wastewater which cannot be fully treated by the activated sludge method and the coagulation sedimentation method. Discharge water quality is difficult to meet the requirements. If it is directly discharged, it will release hydrogen sulfide, which will cause harm to living things, and will also corrode the sewage system, releasing odor and harming people's health. The dye itself is not harmful to the health of the user and is considered to be a non-toxic dye.
In order to solve the wastewater problem, the factory needs to invest a lot of money, which greatly increases the production cost. Moreover, toxic hydrogen sulfide gas is easily generated during the dyeing process, and when it reaches a certain level in the air, it can cause dizziness, palpitations, nausea, etc., and has certain danger.
This is one of the important reasons for the gradual decline of sulphur dyes. Since the sulphur dye is insoluble in water, the dyed fabric is not resistant to friction and is not resistant to chlorine bleaching. Further, since the sulfide used for dyeing remains in a large amount in the dyed product, the sulfate radical generated by oxidation of air during storage to embrittle the fiber of finished product. The dyed substance of the black sulphur dye used the most is fragile during storage. Ordinary sulphur dyes are highly alkaline and are associated with malodors, have poor storage stability, are susceptible to contamination due to their affinity for objects, and are difficult to elute. When the sulphur dye is dyed, it needs to be reduced and dissolved before it can be dyed. The post-treatment process is cumbersome, and the whole dyeing process is relatively complicated. Dyed fabrics are usually limited to cellulose fibers such as cotton. The color of the sulphur dye is dim, black is the most important color spectrum, followed by blue, olive and brown, which is difficult to meet the needs of modern society for colorful colors.
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Sulphur Black
1.Name: sulphur black; Sulfur Black; Sulphur Black 1;
2.Structure formula:
3.Molecule formula: C6H4N2O5
4.CAS No.: 1326-82-5
5.HS code: 32041911
6.Product specification:Appearance:black phosphorus flakes; black liquid
Bromo Indigo; Vat Bromo-Indigo; C.I.Vat Blue 5
1.Name: Bromo indigo; Vat bromo-indigo; C.I.Vat blue 5;
2.Structure formula:
3.Molecule formula: C16H6Br4N2O2
4.CAS No.: 2475-31-2
5.HS code: 3204151000 6.Major usage and instruction: Be mainly used to dye cotton fabrics.
Indigo Blue Vat Blue
1.Name: indigo blue,vat blue 1,
2.Structure formula:
3.Molecule formula: C16H10N2O2
4.. CAS No.: 482-89-3
5.Molecule weight: 262.62
6.HS code: 3204151000
7.Major usage and instruction: Be mainly used to dye cotton fabrics.