|
Item |
Indices |
|
Product name |
Direct Black VSF |
|
C.I.No |
Direct Black BK22 |
|
Color index |
6473-13-8 |
|
Appearance |
Black uniform powder |
|
Strength |
600 |
|
Color shade |
Similar to the standard substance |
|
Solubility at 80℃ |
15g/l |
|
Insoluble |
0.5 |
|
Light fastness |
6-7 |
|
Washing fastness |
4 |
|
Perspiration |
5 |
|
Soap fading |
2-3 |
Product Application
Direct Black VSF is used for dyeing cotton and viscose fibers, and can also be used for dyeing hemp, silk and nylon.
Product Property
Direct Black VSF is Direct sun-resistant. Direct Black VSF is used for dyeing cotton and viscose fibers, and can also be used for dyeing hemp, silk and nylon.
Fastness of dyes on cotton fabrics:
|
Dyeing depth,% |
Resistance Sunlight |
Resistance washing with soap at 95 ℃) |
Resistance water |
Resistance perspiration |
Rubbing |
||||||||||
|
acid |
alkali |
||||||||||||||
|
change |
Stain on cotton |
Stain on Viscose |
Change |
Stain on cotton |
Stain on wool |
change |
Stain on cotton |
Stain on wool |
change |
Stain on cotton |
Stain on wool |
Dry |
Wet |
||
|
6 |
6 |
3 |
4-5 |
4 |
4 |
4-5 |
4-5 |
4 |
4-5 |
4-5 |
4 |
4 |
- |
2-3 |
1-2 |
Product Package,Transport and Storage
Production workshop
FAQ
What is Direct Black VSF?
Direct Black VSF is a synthetic dye that belongs to the direct dye class. It is also known as C.I. Direct Black BK22 or Naphthol Black. This dye is widely used in the textile industry for dyeing and printing applications, and it produces a deep black color. Direct Black BK22 is soluble in water and can be applied directly to the fabric without the need for a mordant or fixative.
How does Direct Black VSF work?
Direct Black VSF works by penetrating the fibers of the fabric and forming a bond with them. Direct Black VSF has good color fastness properties because it forms multiple bonds with the fibers and has strong affinity for them.
Direct Black VSF is a water-soluble dye, which means that it can easily dissolve in water and be applied directly to the fabric without the need for a mordant or fixative. The dye molecules are attracted to the negatively charged groups on the surface of the fibers, such as hydroxyl and carboxyl groups. These groups act as binding sites for the dye molecules, which then penetrate the fibers and become trapped inside.
The color of Direct Black VSF is a deep black due to the presence of multiple chromophore groups in its chemical structure. These groups absorb light in the visible spectrum and reflect back only black. The dye molecules are also able to scatter light, which gives the black color a slight sheen or glossiness.
What is the advantage of Direct Black VSF ?
Direct Black VSF has good color fastness properties, which means that it resists fading or bleeding when exposed to light or water. This dye is highly compatible with a wide range of fibers, including cotton, silk, wool, and other synthetic fibers. It is also used in the paper and leather industries. Direct Black BK22 is a versatile and popular dye that has a long history of use in the textile industry
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