| Molecular Formula | [C38H22N7O12S.Cr.2Na] [C36H19N6O11S.Cr.2Na] |
| Physical and Chemical Properties | Black powder. The aqueous solution was blue-gray in color and had a solubility in water (90 °c) of 30g/L. |
| Use | Used for dyeing of silk, wool, tussah silk, nylon, vinylon, Wei/cotton, wool/viscose and other blended fabrics |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | neutral black BGL is mainly used for dyeing wool and silk in weak acid or neutral dyeing bath, nylon, vinylon dyeing, direct printing of wool, silk, nylon fabric. When it is used for dyeing wool with other fibers in the same bath, the color of nylon is slightly darker, the silk is slightly lighter, and the diacetate fiber and viscose fiber are slightly stained. It can also be used for leather dyeing. It is used for dyeing silk, wool, tussah silk, nylon, vinylon, Wei/cotton, wool/viscose and other blended fabrics |
| production method | 5-nitro-2-aminophenol, 4-nitro-2-aminophenol, 1-acetylamino-7-naphthol, 2-naphthol, and acidic medium black A(C.I.mordant Black 1) as the raw material, the first 5-nitro -2-amino phenol, 4-nitro -2-amino phenol diazotization, then coupled with 1-acetyl amino -7-naphthol and 2-naphthol, respectively, and then complexed with acid medium black A through sodium chromium salicylate, filtered and dried to obtain the finished product. Diazotization.. Coupling.. Complexation.. 30% of water and 31ml of hydrochloric acid () were added to the diazotization reaction flask, and the mixture was stirred. 10.2G 5-nitro-2-aminophenol, 5.5g 4-nitro-2-aminophenol and 12mL NaOH solution (40%) were added, stirred for 2H, and then cooled to 10-15 °c, the dropwise addition of 22mL NaNO2 solution (30%) was started on After adding it in 30min, continue stirring until the end point to obtain diazo liquid. Add 12mL ml of water and 40% NaOH solution () into the coupling reaction flask, stir, warm to 30-40 ℃, add 5.4g of 2-naphthol and 14.0g of 1-acetylamino-7-naphthol, stir, the temperature was lowered to 10-15 ℃, and the above diazo solution was added dropwise, which was completed within about 1H. Stirring was continued for 1-2H to the end point to obtain the azo compound. Add sodium chromium salicylate solution and acid medium A solution in the complexation reaction bottle, stir and warm up to reflux for about 3H, cool to 60 ℃, add the above coupling solution, and adjust the pH value to 8-8.5 with NaOH solution, heating and refluxing for 4H, cooling to 60 ℃, adjusting the pH value to 7.5 with hydrochloric acid, salting out with salt, filtering, washing the filter cake with water to neutral, and drying to obtain the finished product. |