Product Character: Sulphur black is insoluble in water or ethanol, it appears as green-black in the solution of sodium sulfide, appears bluish when put caustic soda in the solution of sulphur black, and appears greenish precipitate with hydrochloric acid It's miniature soluble in cold sulfuric acid, turns to greenish blue precipitate after it's warmer, then turns to black-blue when keeps heating. Sulphur dyes have good dye-uptake and level dyeing.
Product Specification
Other Names: Sulphur Black 1
Strength: 240%; 220%; 200%; 180%; 150%;100%……
Appearance: Big Shining Black flakes or granules
Packing: 25kgs PP Bag/Kraft Bag/Iron Drum
Colorshades:BR 522 (Reddish Tone) and B 521 (Greenish Tone)
Application:Used for dyeing Cotton, Jeans ,Denim and so on....
Production Method: it is made of 2, 4-dinitrochlorobenzene and sodium hydroxide solution in the case of near boiling, hydrolysis into sodium dinitrophenol solution, and then with sodium polysulfide aqueous solution according to a certain molecular ratio heating boiling, under pressure or not pressure, reduction and sulfur reaction and prepared.
Dyeing and preparation of sulphur black br: For the dyeing and preparation of sulfur black br, the sulfur black dye is insoluble in water.During dyeing, sodium sulfide or other reducing agents shall be used to reduce the dye into soluble leucosomes. It has affinity to the fiber and dyes the fiber, and then recovers its insoluble state after oxidation and color development and is fixed on the fiber.
Storage&transportation: Sulphur Black BR must be stored in shade, dry & well-ventilated warehouse. Avoid to be contacted with oxidizing chemicals and combustible organic substances. Keep it away from direct sunlight, heat, sparks and open flames. Carefully handle the product and avoid damaging the package.storage,packaging,transportation,loading,
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Post time: Oct-28-2022