Uses
C.I. Direct blue 75 is a good dyeing agent for cotton fabrics.
Preparation
3-Aminobenzenesulfonic acid diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, its product to diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, again diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.
Properties and Applications
dark blue. Soluble in water for blue, insoluble in other organic solvents. In the dark for the strong sulfuric acid, diluted to red light purple red for brown. The dye solution to join strong hydrochloric acid for blue; Add thick sodium hydroxide solution for red light purple
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Standard
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Acid Resistance
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Alkali Resistance
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Light Fastness
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Soaping
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Water
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Fading
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Stain
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Fading
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Stain
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ISO
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4-5
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4
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5
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2-3
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3
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AATCC
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4
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3-4
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4-5
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2
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3
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References
[1] Sawada K, Ueda M. Adsorption behavior of direct dye on cotton in non-aqueous media[J]. Dyes and pigments, 2003, 58(1): 37-40.
![tetrasodium 5-[[1-hydroxy-6-(phenylamino)-3-sulphonato-2-naphthyl]azo]-8-[[6-sulphonato-4-[(3-sulphonatophenyl)azo]naphthyl]azo]naphthalene-2-sulphonate Structure](https://www.chemicalbook.com/CAS/GIF/6428-60-0.gif)
