Direct Black 22

Direct Black 22 (Direct fast black GF) alias direct gray AB, direct black L-2BG. Appearance is generally gray-black powder. Water solubility is good, soluble in water is purple-black, dye is purple black in concentrated sulfuric acid, dark brown precipitate after dilution In the concentrated nitric acid, it is a reddish brown solution and a precipitate. The aqueous solution with concentrated hydrochloric acid has a brownish black precipitate, and the concentrated sodium hydroxide turns dark blue red. When the copper and iron ions are slightly changed.

TRADE NAME:Direct Fast Black VSF600,Direct Fast Black GF,Direct Black L-2BG,Direct Fast Black B,Direct Fast Black C,Direct Fast Black NS,Solar Black 6NBI

Key Features

• High color strength for deep, uniform black shades
• Excellent wash and light fastness
• Good compatibility with other direct dyes
• Easy to apply in batch and continuous dyeing processes
• Consistent performance under varying pH and temperature conditions
• Low environmental impact compared to conventional dyes

Technical Specifications

• ‍CAS NO: 6473-13-8
• CI.NO: 35435
• Molecular Formula:C44H32N13Na3O11S3
• Molecular Weight: 1083.97‍

Colour Fastness Test

Application:

Direct Black 22 Mainly used for cotton, viscose, wool/stick,nylon/rayon blended fabric dyeing and printing, also used in leather and paper dyeing.

Use condition:

• ‍1. Direct Fast Black VSF600 dyed cotton or viscose fiber has green light black. Poor transferability, sensitive to salt, slow temperature rise during dyeing and salt addition to control dyeing, uniform color can be obtained. The highest dyeing temperature is 100 ° C. After dyeing, treated with copper salt, the microstrip is blue-red and black.
• 2. Direct Fast Black VSF600  is also used to dye silk and its fabric. When cotton, viscose fiber and other fibers are dyed in the same bath, silk and wool are lighter than cotton and viscose, and nylon has stain, divine vinegar. Slim and stained, three vinegar fiber does not stain.
• 3.Direct black 22 can be used for direct printing of cotton or viscose fabric. When printing dark pattern, add urea, disodium hydrogen phosphate, soda ash or sodium hydroxide to adjust the color paste. Also used for ground color discharge, pull White performance is better.‍

FAQ

How do I achieve the best fastness with Direct Black 22?

Optimal fastness is achieved by controlling dye bath temperature and pH, and by following recommended fixation times. It exhibits strong resistance to washing and light exposure.

Is Direct Black 22 suitable for continuous dyeing?

Yes, it performs well in both batch and continuous dyeing processes due to its high solubility and stable behavior under varying conditions.

Can Direct Black 22 be combined with other dyes?

Yes, it is compatible with most direct dyes, enabling customized shade creation without compromising fastness.

What environmental considerations are associated with Direct Black 22?

Direct Black 22 has a lower environmental impact than many conventional dyes due to its efficient fixation and minimal chemical residue in effluent.