| Use | vulcanized red brown B3R is mainly used for dyeing cotton, hemp, viscose fiber, Vinylon and its fabrics, as well as a combination of various brown colors with red light. Also with the sulfide yellow brown 5G, sulfide Black BN as three primary colors of gray, camel, light brown and other colors. It can also be used for leather coloring. |
| production method | using 2, 4-diaminotoluene and p-aminophenol as raw materials, 4-diaminotoluene and p-aminophenol (p-nitroso phenol can also be used) are condensed under alkaline conditions through air oxidation, the intermediate 8-amino-7-methyl-2-phenazinol (8-amino-7-methyll-2-phenazinol) was prepared, and then refluxed with an aqueous solution of sodium polysulfide at 115-117 °c, diluted with water, and oxidized with air, filter drying to obtain the finished product.. 1 part of 2, 4-diaminotoluene, 0.98 parts of p-aminophenol, 1.1764 parts of sodium hydroxide, 0.1969 parts of hydrochloric acid, 0.2672 parts of soda ash, potassium permanganate 0.09kg (100%), 17.5 of water was oxidized by air at 18.5-° C., condensed for 4.5h, and then filtered to obtain a filter cake of intermediate 8-amino-7-methyl-2-phenazinol (I). The cake was added to 3000kg of water, heated to 80-81 °c, blown for 13h and filtered to give (II) a cake. 3 parts (II) of filter cake, 420kg of sodium sulfide (100%) and 705kg of sulfur (100%) were heated to 116-117 ℃ for 22h and then diluted with water, control the temperature in 85-90 deg C blowing air oxidation 18h, pressure filtration, drying to dye. |