Chemical Properties
Bright blue to black powder. Poor water solubility, aqueous solution is blue. Black solution in concentrated sulfuric acid, insoluble in hydrochloric acid, caustic soda, organic solvents. Slightly change the color and light when met with copper ions, yellow and dark when met with iron ions.
Uses
Direct Blue 108 has the structure of triphenyl two oxazine, and can be used in dyeing of cotton, viscose fiber, silk and its blended fabrics[1].
Preparation
9-Ethyl-9H-carbazol-3-amine and 2,3,5,6-Tetrachlorocyclohexa-2,5 -diene-1,4-dione in Pyridine of condensation,with 99.5% of sulfuric acid sulfonation simultaneously closed and third (obtained Sirius Blue FTFGL); or in o-dichlorobenzene and 4-Methylbenzene-1-sulfonyl chloride condensation and cyclization as above and trisulfonated (obtained Sirius Blue FFRL), then into trisodium salt. Chemical structure of two products are the same.
Properties and Applications
bright blue. To black powder. Soluble in water solution for blue, insoluble in hydrochloric acid, sodium hydroxide solution and organic solvents. The strong sulfuric acid dyes for black solution, water-soluble poor. Dyeing of copper (a slight change in color, meet iron ion colored light yellow and dark. Reducing resistance, won’t be insurance powder reduction. Used for cotton, viscose, silk and their blended fabric dyeing, general is not used for printing. Usually used for washing the less number of flocking fabric.
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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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2
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4
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6-7
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2
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2
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References
[1] Yang ZHU, et al. Oxidation Decoloration Kinetics of C.I. Direct Blue 108 in Activated Oxygen Bleach Systems. Advanced Materials Research Vols 332-334 (2011) pp 391-394
