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Sulphur black BR 200%-best indigo clothing dye

Sulphur black BR 200%

The appearance of sulphur black is black flaky crystal, and the surface of the crystal has different degrees of light (changes with the change of strength). The aqueous solution is a black liquid, and sulphur black needs to be dissolved by means of sodium sulfide solution.

The production process of sulphur black is based on 2,4-dinitrochlorobenzene, which is hydrolyzed under alkaline conditions to obtain 2,4-dinitrophenol sodium salt, which is then added to sodium polysulfide solution for vulcanization. After oxidation, filtration, The finished product is dried.

Sulphur Black

Sulphur black is mainly used for dyeing cotton, hemp, viscose and its blended fabrics. Most of the denim fabrics (black) popular at home and abroad are made of woven black warp yarn and white yarn. Sulphur black has many disulfide bonds after being reduced by sodium sulfide, and it is easy to be oxidized to reduce the strength of dyed fabrics, that is, brittleness. In order to prevent brittle damage, you need to pay attention to these points:

1、Control the amount of sulphur black. The more the amount of sulphur black, the more likely brittle damage will occur.

2、Wash thoroughly to minimize floating color on the cargo.

3、Use Taikoo Oil's additives to prevent embrittlement.

4、Scouring with fresh water before dyeing. The yarn embrittled with the test water after dyeing has a better degree of embrittlement than lye.

5、Dry in time after dyeing to reduce the content of anti-brittle aids caused by wet accumulation.

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