Sulphur Black 1

Application Features

Colour Fastness Test

Sulphur black BR dye strength is 100%~200%, the appearance is black powder, the color is similar to the standard, fineness (20 mesh) Sieve residue) ≤5.0%.

Double-vulcanized black is coarse powder, insoluble in water and alcohol. Soluble in sodium sulfide solution, greenish black, slightly soluble in cold concentrated sulfuric acid solution, in hot concentrated sulfuric acid The solution is dark green blue, and continues to heat to black blue. In case of fuming sulfuric acid, it is black-blue, and it is green and black precipitate after dilution.

The dye is yellowish olive in the alkaline powder solution, oxidized.

After returning to the original color, all faded in the sodium hypochlorite solution.

Sulphur Black 1 Use condition:

1. Sulphur Black 1(Sulphur black BR) is suitable for dyeing cotton, hemp and viscose. It is also suitable for the dyeing of vinylon.

2. It is mainly used for dyeing cotton, and the dyeing rate and levelness are good. After dyeing, it should be washed with water to remove alkali to facilitate oxidation. Oxidation in air. The temperature in dye bath is 90~95. When the pH value is 9.5~10, the dyeing effect is the best and the leveling property is medium. It is not suitable for oxidation with hydrogen peroxide.

3. When the dyed cotton blended fabric is black, in addition to the blackened BN, it is also necessary to add sulfurized reduced black CLN (at least 30% of the sulfurized black BN) and a small amount of sulfurized dark green, otherwise the surface of the dyed white will not be It is dyed black and black. The amount of dye should be adjusted according to different blending ratio. When chemicalizing, the sulfurized reduction black GLN should be separately prepared and then mixed with dye such as sulfur black BN.

4. Sulphur black 1 Due to the presence of unstable sulfur, it is easily oxidized by air to form sulfuric acid under hot and humid conditions, which makes the fabric brittle. Therefore, the dyed material cannot be stored for too long, and it is not suitable to be oxidized by an oxidizing agent, otherwise the fiber will be accelerated. Usually, the addition of Taikoo oil-bone glue-sodium acetate mixture and amino-containing compounds such as urea for anti-brittle treatment can improve the brittleness phenomenon. Although soda ash can also prevent fragility, it will cause a decrease in soaping fastness after storage for a long time.

5. Sulphur black 1 is the main dye dyed black in cotton yarn. Immediately after dyeing, it is put into low temperature (25~40°C) dyeing residue for 5min, and then washed. The number of cylinders should not be too much, otherwise the color will gradually reddue and produce bronze strips. flower.

6. After dyeing, it is generally oxidized by air and does not need to be soaped. However, when hot washing is added 1.2 to 1.8 g/L of sulfide base, and then rinsed with cold water to oxidize it without pickling.

7. Sulphur black BR dyeing, oxidation, soaping, after treatment with Taikoo oil, can increase the degree of blackening, and improve softness and anti-brittle effect. Dosage: Taikoo oil (Turkish red oil) 20mL / L, trisodium phosphate 3g /L, after being treated for 30 minutes in a greenhouse, thoroughly washed with water.

8. After the spelt is scoured and desalted, it is slightly alkaline, and the color is dark.

9. Sulphur black BR After dyeing or tumbling, the dyeing material must be completely immersed in the dyeing solution to prevent exposure to the air, avoiding premature contact with air and oxidation and erythema. If erythema is present, stannous chloride can be used. The metal salt solution such as ferrous sulfate (1%~10% of the weight of the fabric) is improved. After washing, it is washed with water and oxidized in the air for a long time to prevent causing alkali spots. The washing should be sufficient until there is no black water. Otherwise, there will be floating colors to make the color not black.

10. When the dyeing is done, the edges of the fabric should be flush to prevent red edges. The number of cylinders should not be too much, so as to avoid yellowing of the color.

11. After sulfurized black BN dyeing, it should be treated with soaping at 50 °C. If the temperature is too high, it is easy to produce bronze staining.

12. After sulfur black dyeing, it is not suitable to use copper sulfate for fixing treatment, because the presence of metal salt will accelerate the brittleness of the fiber.

Precautions

Sulphur Black 1 (Sulfur black BN) dyeing can not be stored for too long, because the dye on the dyed material has unstable sulfur, and it is oxidized by air to produce sulfuric acid under humid heat conditions, so that the fabric is brittle, so it is not suitable to oxidize with oxidant, otherwise it will accelerate the brittleness of the fiber. The storage period is 1 year.

Mainly used for cotton, paper, leather, etc.