Direct Black 19 CAS #6428-31-5
Direct Black 19 CAS #6428-31-5 - 图片 2
Direct Black 19 CAS #6428-31-5 - 图片 3
Direct Black 19 CAS #6428-31-5 - 图片 4

Direct Black 19 CAS #6428-31-5

1. Characteristics
Deep black color: can provide rich and deep black tones.
Directness: can dye the fiber directly without the help of mordant.
Good color fastness: has good color fastness such as washing and rubbing to a certain extent.
2. Application fields
Textile printing and dyeing: widely used in dyeing natural fibers and synthetic fibers such as cotton, linen, silk, wool, etc., especially suitable for dyeing dark fabrics.
Paper dyeing: can make paper appear black or dark effect, used for special purpose paper production.
Leather dyeing: provides a black appearance for leather products.

Category Tag

Direct Black 19 CAS #6428-31-5

Direct Black 19 Basic information
Product Name: Direct Black 19
Synonyms: disodium 4-amino-3,6-bis[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxynaphthalene-2,7-disulphonate;Black G;Atul Direct Black VG;Benzo Fast Black G;Condires Black AN;Kayarus Black G;Sumilight Black G;Tertrodirect Viscose Black GTN
CAS: 6428-31-5
MF: C34H30N13NaO7S2
MW: 819.81
EINECS: 229-208-1
Product Categories: Organics;Dyes and Pigments
Mol File: 6428-31-5.mol
Direct Black 19 Structure
Direct Black 19 Chemical Properties
Boiling point 1379℃[at 101 325 Pa]
density 1.49[at 20℃]
vapor pressure 0Pa at 25℃
Water Solubility 22.67g/L at 20℃
LogP -1.5 at 20℃
CAS DataBase Reference 6428-31-5(CAS DataBase Reference)
EPA Substance Registry System C.I. Direct Black 19, disodium salt (6428-31-5)
Safety Information
Hazardous Substances Data 6428-31-5(Hazardous Substances Data)
MSDS Information
Direct Black 19 Usage And Synthesis
Preparation 4-Nitrobenzenamine (2 Moore) diazo, one in acid conditions, a in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid (1 Moore) coupling, and then will the nitro reduction, diazotization, again with Benzene-1,3-diamine (2 Moore) coupled.
Flammability and Explosibility Non flammable
Properties and Applications green and black. Black powder. Soluble in water for green light black, solubility of 100 g/L (80 ℃), slightly soluble in ethanol and acetone. The strong sulfuric acid in the green light for black, dilute red after black precipitation; In nitric acid to dark brown. Dyes and microstructure of sulfuric acid solution 10% red; Add thick sodium hydroxide solution for green light blue. Copper ions in dyeing color shade the green, iron ion a slight change in color. Used in viscose of dyeing and printing. In the cotton knitwear, blankets, flannelette, silk, viscose, silk that the fabric, wool/viscose fiber blend fabrics can be used. Can also be used in leather, paper and electrochemical aluminum color.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 4 3 3-4 2 2
AATCC 4-5 3 3 2-3 2

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