The Most Popular Direct Fast Black G For Dyeing Paper
Product Specification
| Name | Direct Fast Black G |
| Other Name | Direct black L-3RQ |
| Other Name | Direct Black 19 |
| Cas No. | 6428-31-5 |
| Appearance | Deep Black Powder |
| Packing | 25KGS PP Bag/Kraft Bag/Carton Box/Iron Drum |
| Strength | 100%, conc150% |
| Application | Mainly used for dyeing cotton, viscose fiber, can also be used for leather, silk, paper and so on. |
Description
The raw materials of direct fast black G are m-phenylenediamine, p-nitroaniline and H acid. First, p-nitroaniline is diazotized, and then the first coupling with H acid is carried out in the weakly acidic medium. Then the second coupling with H acid was performed under weak basic conditions. Then use alkali sulfide to reduce the nitro, and diazotization, and m-phenylenediamine for the third coupling product. After salting out, filtering, drying, grinding the finished product.
Product character
The product character of Direct Fast Black G includes:
Physical form: Black powder.，very good water solubility , its aqueous solution is greenish black, add 10% sulfuric acid color is slightly red; add concentrated alkali solution is greenish blue. Slightly soluble in ethanol, acetone. It is greenish black in concentrated sulfuric acid and produces red black precipitate after dilution; it is dark brown in concentrated nitric acid. Slightly greenish when stained with copper ions, slightly changed when stained with iron ions.Mainly used for dyeing cotton, viscose fiber, can also be used for leather, silk, paper and so on.
Main features
The main features of Direct Black include:
A.Direct black 19 is one of the main black dye varieties. It is mainly used for dyeing and direct printing of cotton, viscose fiber and cotton, viscose fiber and silk, wool interwoven blended fabrics.
B. Direct fast black G is mainly dyed black, printing is generally used in gray and black, but also with brown dyestuff into a variety of different depths of coffee and other colors, a small amount for toning light, to increase the color spectrum. When dyeing wool viscose fiber blended fabrics, it can be dyed in the same bath with neutral black BRL to obtain uniform color. It can also be dyed with disperse dyestuff in the same bath with polyester viscose blended fabrics.
C. The dyeing rate is good, but the dyeing transferability is a little worse. After dyeing, it can be treated with fixing agent Y and fixing agent M, but the color light is slightly green.
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Application
It is mostly used for dyeing paper，It can also be used for dyeing rayon silk and wool so on.
Packing
25KGS PP Bag/Kraft Bag/Carton Box/Iron Drum
Storage & Transportation
The product must be stored in shade, dry & well-ventilated warehouse. Avoid to be contacted with oxidizing chemicals and combustible organic substances. Keep it away from direct sunlight, heat, sparks and open flames. Carefully handle the product and avoid damaging the package.
