Direct Blue 138
Name:C.I.Direct Blue 138,C.I.26650
Molecular Structure: Double azo class
Molecular Formula:C27H18ClN5Na2O8S2
Molecular Weight: 686.02
CAS Registry Number:6252-59-1
Manufacturing Methods : 2′-Methoxy-4′-amino-5′-chlorooxanilic acid diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, and 4-Hydroxynaphthalene-2-sulfonic acid coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis base.
Properties and Applications: blue. Slightly soluble in water for sauce red to violet black, soluble in ethanol to blue. The strong sulfuric acid for blue-ray green, diluted to blue-ray for blue purple, have precipitation. The dye solution to join strong hydrochloric acid have dark purple precipitation; concentrated sodium hydroxide solution with dark purple precipitate; Add 10% of sulfuric acid and sodium hydroxide solution not change color.
Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
Fading | Stain | Fading | Stain | ||||
ISO | 4 | 5 | 4 | 3-4 | 4 | ||
AATCC | 5 | 5 | 4 | 2-3 | 5 |
List of Suppliers:
Diazo SkyBlue 3GL( Bayer Group )
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