Name | Sulphur Dark Blue 3R |
Synonyms | Sulphur Blue 3R. C.I.Sulphur Blue 5 Asathio Navy Blue R Sulphur Dark Blue 3R Dycosulfur Dark Blue 3R Dycosulphur Dark Blue 3R |
Physical and Chemical Properties | Chemical properties dark blue powder. Insoluble in water. Dissolved in sodium sulfide solution is green and blue. It is blue in concentrated sulfuric acid, and dark blue precipitate is produced after dilution. It is light olive in alkaline hydrosulfite solution. All fade in sodium hypochlorite solution. |
Use | Use 1, vulcanized dark blue 3R is suitable for cotton, hemp, viscose fiber and its fabric dyeing, as well as Vinylon and cotton blended fabric dyeing, cotton direct printing. With the sulfur blue BRN fight Navy, the effect is better. 2, used for cotton and dimension/cotton blended fabric dyeing |
Using 2, 4-dinitrochlorobenzene and p-aminophenol as raw materials, the two are first condensed under alkaline conditions to obtain the intermediate 2, 4-dinitro-4'-hydroxydiphenylamine, It is co-heated with sodium polysulfide solution, diluted with water, oxidized with air until the end of the reaction, filtered, dried, and crushed to obtain the finished product..
1 part of 2,4-dinitrochlorobenzene, 1.011 parts of p-aminophenol, 0.0646 parts of sodium bisulfite (NaHSO3), 0.52 parts of calcium carbonate and 30kg of hydrochloric acid (30%) were heated to 98-99 ℃ for condensation reaction for 6 hours to obtain intermediate 2,4-dinitro-4'-hydroxydiphenylamine, which was filtered to obtain (I) filter cake.
The above (I) filter cake, 1 part of sodium sulfide (Na2S), 3.1 parts of sulfur (0.6 parts of sulfur added later) and 15kg of sodium carbonate (98%) are heated to 113 ℃ and vulcanized for 10h to obtain (II).
The above (II) is heated with 900-1000kg of sodium hydroxide solution (29.5%) and 80kg of sodium carbonate (98%) to 45 ℃, blown and oxidized for 22-23h to the end point, and the product (III) is filtered. Beat (III) and 80kg sodium carbonate (98%) and dry to obtain the finished product.