Sulphur Blue 15

Application Features 

Colour Fastness Test

Sulphur Blue 15 (Sulfur blue CV) is also known as sulfur blue SV and sulfur blue 3G.

The appearance is blue-gray powder with 100% and 150% dye strength. It is slightly soluble in water and insoluble in alcohol and benzene.

It is dark blue in concentrated sulfuric acid and diluted. Dark blue precipitate.

The dye is dark yellow in the alkaline powder, and can return to normal color after oxidation;

it is olive in sodium sulfide and completely fades in sodium hypochlorite solution.

Sulphur Blue 15 Use condition:

1.Sulphur Blue 15 is suitable for dyeing cotton, hemp and viscose. It is also suitable for vinylon dyeing and sometimes for printing.

2. It is especially suitable for dark color chromatography of thick fabrics such as cotton, hemp, viscose, vinylon, etc. It is simple in process and convenient to use. It needs to add anti-oxidant when dyeing light color, no anti-oxidant when dyeing dark color, stable color and color. Bright, wet processing fastness, small color difference, can improve the pass rate of finished products.

3. Sulphur Blue 15 has high dye uptake rate and good leveling property; however, the oxidation rate is slow. After washing, the water washing should be sufficient to remove the sodium sulfide residue remaining on the cloth surface, accelerate the oxidation of the dye, and make the cloth surface even. Below 70 ° C, the dyeing is dark and bright, the temperature is too high, the shade is gray, and the leveling is poor.

4. When used for padding cotton cloth, baking soda can be added in the padding solution, the amount is 10% ~ 15% of the alkali sulfide, not too much, otherwise the dyeing is not transparent, resulting in white core.

5. When dyeing vinylon, the color is lighter than cotton, the color is dark, and the leveling is poor.

6. Since the Sulphur Blue 15 has a hydrophilic group sulfonic acid group (-SO3H), the staining fastness of the dyed material is poor, and it needs to be treated with a fixing agent.

7. Sulphur Blue 15 is often used to dye blue and green colors. Pay attention to the dye dyeing temperature when dyeing, otherwise it will easily produce color difference.

8. Oxidation using hydrogen peroxide or sodium perborate is preferred, bright color, blue light, but the soaping fastness is reduced.

Precautions

Sulphur Blue 15 should be placed in a ventilated and dry place to prevent exposure to sunlight and rain and to avoid moisture.

Mainly used for cotton, hemp, viscose fiber dyeing and printing.