disodium 3,3'-[(3,3'-dimethyl[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[2,4-diamino-5-methylbenzenesulphonate] ]

Preparation

3,3′-Dimethylbenzidine double nitriding, and 2,4-Diamino-5-methylbenzenesulfonic acid (2 Moore) coupled.

Properties and Applications

bright orange. Golden yellow to orange for insoluble in water, soluble in soluble fiber element, slightly soluble in alcohol for yellow brown, insoluble in other organic solvents. The strong sulfuric acid to red light brown, after dilution of golden orange, precipitation; In nitric acid solution for brown, to green. The dye solution to join strong hydrochloric acid for red orange brown, have precipitation; Add thick sodium hydroxide solution for gold orange. Used for cellulose fiber and polyamide fiber dyeing, also can be used for leather and paper shading, Exhaust dyeing.