Name:C.I.Direct Red 37,C.I.22240
Molecular Structure: Double azo class
Molecular Weight: 676.63
CAS Registry Number:3530-19-6
Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first and 7-Hydroxynaphthalene-1,3-disulfonic acid coupling, again with phenol coupling, and then in contain sodium carbonate in aqueous solution of ethanol heating, air pressure,Using Chloroethane to make phenol hydroxy ethylated .
Properties and Applications: red. Soluble in water for red, slightly soluble in alcohol, acetone and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for dark purple, after diluted brown precipitation; In nitric acid solution for colourful red. The dye solution to join strong hydrochloric acid have orange brown precipitation; Add thick sodium hydroxide solution for red orange, precipitation.
|Standard||Acid Resistance||Alkali Resistance||Light Fastness||Soaping||Water|
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