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Sulfur black ||Promoter S in the application of sulfur black dyeing process and advantages

The introduction of sulfur black used to add 1-2 times the sulfuric acid base to reduce, the large amount of sulphide produced in the wastewater of hydrogen sulfide odor caused by environmental and ecological pollution, to a certain extent, affect its application. To solve the problem of environmental protection in the dyeing process of sulphur dyes and to maintain low-cost applications has always been a topic of concern in the industry.
Accelerator S has already sold more than 10,000 tons on the market since the beginning of the month of 2012.
User consistent evaluation:
1. Reduce direct costs by at least 28% compared to using sodium sulfide and reduce storage area;
2. It is convenient and reliable to use, it guarantees the dyeing quality and can increase the number of renewal dyeing.
3. There is almost no odor in use, which reduces the labor intensity of workers, effectively improves the working environment, and effectively protects the dyeing equipment.
4. The overall cost is reduced, and the COD in the wastewater is reduced by more than 20% compared with the use of sodium sulfide.
I. Accelerator S Technical Performance Index
Accelerator is an optimization agent for the dyeing process of sulphur dyes. It has excellent reduction effect. In the process of dyeing cellulose fibers and their blends with sulphur dyes, they can replace the sodium sulfide in the traditional process by 40% and provide significant Energy-saving and emission reduction effects.
Composition: High concentration compound reducing alkali agent
Form: orange solid
Compatibility: It can be used together with yin and non-ionic baths; unlike sulfuric alkali, avoid using with acid and enzyme.
Stability: It is stable to electrolytes commonly used in dye liquors.
Can be stored for half a year under confined conditions (avoid moisture and exposure).
Toxicity/environmental protection: Non-toxic but corrosive. Storage and use should comply with the general hygiene and safety regulations for chemical storage and transportation. Skin contact with this product should be promptly washed with clean water and must not be taken.
Dosage: (based on sodium sulfide)
Human cotton: 40% (including T/C, T/R, CVC, plus 0.3-0.5 g/L NaOH)
Cotton: 40% (to be added another 0.8-1 g/L NaOH)
Usage: Sulfide
1. Sulfur dyes are reduced to leucosomes and dyed
D-S-S-D [H] D-SH + D-SH NaOH D-S-Na+ + D-S-Na+
Sulfur dyes are insoluble in water dye leuco compounds are soluble in water
No affinity for fiber has affinity for fiber
2. Sulfur dye leucoplast oxidative fixation:
D-SH + D-SH [O] D-S-S-D + H2O
Accelerator S is an alkaline reducing agent synthesized according to the above dyeing mechanism, and it has stronger reducing power than sulfurized base, thereby greatly reducing the amount of chemicals used in the dyeing process. Compared to sulfuric alkali, it is almost completely soluble in water, eliminating the production of large amounts of sludge and effectively protecting the dyeing equipment.
a, Variety: Sulfur dyes for fabrics of various organizational structures (including cotton, human cotton, T/C, T/R, CVC,), hank, bobbin, and cotton loose fibers.
b. Equipment: All kinds of domestic and imported high-temperature, room temperature (including Lixin MK, GN, ECO series, Taiwan AK and domestic models of dyeing cylinders).
c. Process flow: Dyeing → Washing → Post-processing → Out of cylinder
II. The amount of accelerator S
Sulfuration dyeing plants have a mature process. We recommend the use of accelerator S to provide a meter, but also can directly replace the amount of sulfuric acid 40%.

Sulfur black and accelerator S reference meter


Note: 1) bath ratio ≥ 1:10 dosage of g / L;
2) If cotton dyeing must add NaOH 0.8-1.2g/L
3) Human cotton, T/C, T/R, and CVC can add NaOH 0.3-0.6g/L if they are less than red light.
Sulfur black process example: (All cotton 32S bobbin yarn 500 kg bath ratio 1:10)
a Process prescription:
Dyeing: Washing oxidation, soap cooking;
Sulfur black BR ​​10% Hydrogen peroxide (27%) 1 g/l
Accelerator S 6 % Soaping lotion 1 g/l
Penetrant 0.8 g/l
Soda 2 g/l anti crisp
Caustic soda 1.2 g/l Urea 1 g/l
Yuan Ming 15 g/l

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