Direct Blue 2B
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Direct Blue 2B is a blue powder, a direct dye soluble in water. Direct Blue 2B is reddish green when exposed to concentrated sulfuric acid. After dilution, it becomes greenish blue with green precipitation. It dyes cellulose fiber fabrics, has poor dye exhaustion and is slightly sensitive to hard water. Milestone Industrial Co. Ltd. is a manufacturer specializing in the production of dyes. The normal Direct Blue 2B has stable performance and excellent dyeing effect, which is well received by users.
Direct Blue 2B
C.I.: Direct B-6
CAS Number: 2602-46-2
Molecular formula: C32H20N6Na4O14S4
Molecular weight: 932.77
EINECS number: 220-012-1
Appearance: Blue Powder
Purpose of Direct Blue 2B:
1) Direct Blue 2B can be used for dyeing cotton, viscose and silk fabrics;
2) Direct Blue 2B is used for the dyeing and printing of viscose silk fabrics. It is also used for the dyeing of viscose fabrics, cotton knitted fabrics and twisted silk. It must not be dyed in dark colors and must be treated with a fixing agent after dyeing.
3) Direct Blue 2B can also be used for dyeing silk fabrics, and can be combined with direct light fast yellow to form light fast green;
4) Direct Blue 2B can also be used for the dyeing of leather and paper and the dyeing of soap and detergent.
Synthesis method of Direct Blue 2B:
Direct Blue 2B is obtained by sulfonating copper phthalocyanine blue with fuming sulfuric acid, diluting, filtering, ammonolysis, and finally salting out and filtering.
Storage method of Direct Blue 2B:
Direct Blue 2B should be stored in a sealed container, stored in a cool, dry place, and ensure that the workplace has good ventilation or exhaust.