Fast Red F3B
C.I.Direct Red 80
Molecular Structure: Multi-azo class
Molecular Formula: C45H26N10Na6O21S6
Molecular Weight: 1373.08
CAS Registry Number: 2610-10-8
Manufacturing Methods : (a) 3,4′-Disulfo-4-aininoazobenzene diazo, and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, and then hydrolysis acetyl amino and light gasification; (b) 3,4′-Disulfo-4-aininoazobenzene (2 Moore) diazo, coupled with N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea.
Properties and Applications: bright blue light pink to red colourful blue-ray. Purple powder. Soluble in water for blue-ray red to product red, soluble in ethanol, soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid dyes for blue, diluted and red to blue light for purple; In the nitric acid to blue. The dye solution to join strong hydrochloric acid has the purple precipitation; Add thick sodium hydroxide solution into a red light purple. 60 ℃ in the solubility of 30 g/L, 97 ℃ in the solubility of 50 g/L. Hard to not sensitive. For colourful red light. In dye in bath of copper, iron ions are slight change color. SDC classification for a class B. Not suitable for the SiMian cover, cotton white for 3-4 neutral level, alkaline white is 3 classes, viscose neutral and alkaline white are level 2. More used to viscose fabric dyeing, a small amount used in printing, also used for silk, wool fabric dyeing and printing, and disperse dyestuff polyester/cotton with bath dyeing blended fabric. Can also be used for leather, paper color.
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