6428-31-5 Usage
Description
Direct Black 19 is a black powder that is soluble in water, producing a green light black color with a solubility of 100 g/L at 80°C. It is slightly soluble in ethanol and acetone. When exposed to strong sulfuric acid, it turns green and then dark black upon dilution, while in nitric acid, it turns dark brown. The dye also exhibits a 10% red color in a sulfuric acid solution and turns green light blue when a thick sodium hydroxide solution is added. The presence of copper ions in the dyeing process results in a green color shade, while iron ions cause a slight color change.
Uses
Used in Textile Industry:
Direct Black 19 is used as a dye for various types of fabrics, including viscose, cotton knitwear, blankets, flannelette, silk, and wool/viscose fiber blend fabrics. It is particularly useful in the dyeing and printing of viscose fabric.
Used in Leather Industry:
Direct Black 19 is also used in the leather industry for dyeing and coloring processes.
Used in Paper Industry:
The dye is utilized in the paper industry to provide color to paper products.
Used in Electrochemical Aluminum Coloring:
Direct Black 19 is employed in the electrochemical process of coloring aluminum.
Standard:
The standard for Direct Black 19 includes the following properties:
Acid Resistance: ISO 4, AATCC 4-5
Alkali Resistance: ISO 3, AATCC 3
Light Fastness: ISO 3-4, AATCC 3
Soaping: ISO 2, AATCC 2-3
Water Fading: Not specified
Stain: Not specified
Fading: Not specified
These properties indicate the performance and durability of Direct Black 19 in various applications, making it a versatile dye for different industries.
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
Nonflammable
Standard
Acid Resistance
Fading
Stain
ISO
4
AATCC
4-5
Check Digit Verification of cas no
The CAS Registry Mumber 6428-31-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,4,2 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 6428-31:
(6*6)+(5*4)+(4*2)+(3*8)+(2*3)+(1*1)=95
95 % 10 = 5
So 6428-31-5 is a valid CAS Registry Number.
InChI:InChI=1/C34H29N13O7S2.2Na/c35-18-1-11-26(24(37)15-18)44-40-20-3-7-22(8-4-20)42-46-32-28(55(49,50)51)13-17-14-29(56(52,53)54)33(34(48)30(17)31(32)39)47-43-23-9-5-21(6-10-23)41-45-27-12-2-19(36)16-25(27)38;;/h1-16,48H,35-39H2,(H,49,50,51)(H,52,53,54);;/q;2*+1/p-2/b44-40+,45-41+,46-42+,47-43+;;
