The most cost-effective Acid Nigrosine100% Black granule used on leather

A. Take alcohol-soluble aniline black as raw material, sulfonate with concentrated sulfuric acid, remove waste acid, wash with water, and then neutralize with sodium hydroxide to obtain the product. Filter and dry to obtain the finished product. Preparation method of alcohol-soluble aniline black (C.I.50415): Heat nitrobenzene, aniline and aniline hydrochloride with iron or copper at 1Chemicalbook80-200℃ to obtain the product. After acid washing, washing, filtering and drying, the finished product is obtained. Alternatively, heat nitrophenol (or nitrocresol), aniline, aniline hydrochloride with a small amount of iron at 180-200℃ to obtain the product. After acid washing, washing, filtering and drying, the finished product is obtained.

B. Mainly used for dyeing leather, silk and wool fabrics, it can also be made into lakes for color paper and printing, as well as coloring of paper, wood products, soap, electroplated aluminum and making ink. It can also be used for biological dyeing, such as dyeing of central nervous tissue, pancreatic tissue, cell spores, etc.

C.Its characteristics are good water solubility, bright color, complete color spectrum, simpler molecular structure than other dyes, lack of longer conjugated system in the dye molecule, and lower directness of the dye.