The using note of sulphur black

Sulphur black dyes is more high molecular compound sulfur, disulfide bond is contained in its structure and key, sulfur and very unstable. Especially the sulphur keys under the condition of certain temperature and humidity can be oxygen oxidation of sulfur oxides in the air, and to further generate sulfuric acid to the water molecules in the air, thus make yarn strength is reduced, the fiber loss, serious when all fiber embrittlement into powder. To do this with sulphur black yarn after dyeing in order to reduce or prevent fiber brittle damage, and must pay attention to the following:

Sulphur black dyes dosage should be restricted, mercerizing, yuan dosage of dye is not more than 700 g/bag. Because of the high dosage of dye, crisp opportunity big, color fastness to reduce at the same time, water is also more difficult.
Should be fully washed after dyeing, prevent water impurities, the floating on the yarn color easily decomposed into sulfuric acid in the process of storage and make the fiber brittle damage.
Must use urea after dyeing, soda ash, sodium acetate to brittle resistance etc.
Yarn dyeing with clear water before practice, after the trial practice of clear water embrittlement degree after the yarn dyeing than alkali scouring is better.
Dyed yarn should be timely after drying, for wet gauze prevails in the process of stacking, reduce yarn brittle resistance agent content, lower pH, against brittle resistance. Yarn, after drying should be natural cooling, the temperature of the yarn down to room temperature is rear can packaging. Because of without cooling after drying, immediately pack, is not easy to heat, born to dye decomposition acid increased energy, causing the possibility of fiber brittle.
Selects the brittle resistance of sulphur black dyes, this kind of dye has joined formaldehyde and chloroacetic acid during manufacture, thus made a sulfide brittle resistance black - chloride type, make the sulfur atom of easy oxidation stability of structure state, which can prevent the oxidation of sulfur atoms to generate acid and make the fiber brittle damage.

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