Direct Blue 15

Application Features

Direct Blue 15 Appearance is generally blue uniform powder. Good water solubility, soluble in water, reddish blue, insoluble in organic solvents. It is blue-green in concentrated sulfuric acid, reddish blue after dilution; in concentrated nitric acid It is reddish gray. Its aqueous solution is concentrated with hydrochloric acid and has a red-blue precipitate. Concentrated sodium hydroxide has a purple precipitate. In case of copper ion, the color becomes dark.

Mainly used for cotton, such as glue the cellulose fibre,  silk and rayon / Kam fabric dyeing, also can be used for pulp, biological, film footage of dyeing, can also be used to make the ink.

Use condition:

1. It has been used to dye cotton or viscose fiber to get bright green blue, such as diazotization after dyeing, coloring with phenylmethylpyridone, which gives blue-green color. The dyeing rate is very good, shifting Dyeing and leveling are poor, it is advisable to add salt to control the dyeing to obtain uniform color. After dyeing, the dyeing solution should be naturally cooled to 60~80 °C, which is good for dye exhaustion.

2. It has been used to dye rich fiber, the dyeing rate is very good, but the color light is slightly darker than cotton. When dyeing vinyl fabric, the dyeing rate is poor, the color light is slightly bluer than the viscose fiber. Cotton, viscose fiber and When the other fibers are dyed in the same bath, the wool and nylon are gray, the silk is very light, the polyester and acrylic fibers are light yellowish gray, and the second vinegar fiber is not stained. When used for cold dyeing, the silk and wool are basically not stained.

3. Direct Blue 15 has also been used for direct printing of cotton or viscose fabrics. When printing dark patterns, it can be used to dissolve dyes in urea. When dyeing for ground color, the dyeing performance is good. After coloring, it was whitened with a stannous chloride reducing agent, and the whitening effect was good.

4. It was once one of the main blue direct dyes. It is mainly used for dyeing and printing of viscose fabrics, cotton knits and fabrics such as flannel and velvet. It is also used in viscose fiber. Dyeing with nylon blend fabric

Precautions

Direct Blue 15 can decompose 3,3'-dimethoxybenzidine, which is a banned dye. The substitute dye is C.I.Direct Blue71｡