Product Introduction
Acid black 194 CAS# 61931-02-0 is an azo and chromium complex dye with the appearance of black powder or particles. It dissolves in water readily. The water solution shows black color.
Mainly used in the dyeing and direct printing of wool, silk and nylon/polyamide. And can also be used in the dyeing of leather.
pH 4.5-5.5 recommended for the dyeing of wool; pH 4.5-5.5 recommended for the dyeing of nylon/polyamide.
Physical and Chemical Parameters
|
Appearance |
Black Powder or Particles |
|
pH Value (1% Water Solution) |
3.70-5.70 |
|
Strength |
98%-101% |
|
Color Difference CMC (2:1) |
≤0.50 |
|
Moisture |
≤8.00% |
|
Insoluble |
≤0.200% |
|
Solubility (90℃) |
≥50g/l |
|
Degree of Fineness (200um) |
≤8 |
|
Dust-Proof Performance |
≥2 |
Fastness Properties (Polyamide)
|
DYEING DEPTH (O.W.F) |
LIGHT (XENON) |
WASHING (50℃) |
PERSPIRATION (ALKALI) |
RUBBING |
WATER |
|
4% |
1/1 |
CH PA CO |
CH PA CO |
(DRY) (WET) |
CH PA CO |
|
6 |
4 3 4 |
4-5 4-5 4-5 |
4-5 4-5 |
4-5 4-5 4-5 |
FAQ
Q: Do acidic dyes stain microbial cells?
A: Normally acid dyes do not stain microbial cells since both of them are negatively charged.
Q: Which dye is banned in the textile industry?
A: Some azo dyes are banned in the textile industry. These azo dyes release potentially carcinogenic aromatic amines.
Q: Are acid dyes positive or negative?
A: Acid dyes contain negatively charged groups, such as sulphonic or carboxyl groups.
Q: Are acid dyes natural?
A: Acid dyes are not natural. Acid dyes are synthesized from chemical reactions. But people could find some natural colors to dye the fibers.
Q: How are acid dyes classified?
A: Acid dyes could be classified by their dyeing performance and chemical structures. By dyeing performance, acid dyes could be divided into three types: strong acid bath, weak acid bath and neutral bath; By chemical structures, acid dyes could fall into several categories: azo dyes, anthraquinone dyes, triarylmethane dyes, xanthene dyes and so on.
Q: Is food coloring an acid dye?
A: Food coloring could be an acid dye. Food coloring are also called food dyes and they are also used for beverages, drugs, cosmetics and so on. They are water soluble with low toxicity or no toxicity.
Q: Where are acid dyes used?
A: Acid dyes are mainly used in the dyeing and printing of fibers such as wool, silk, nylon and modified acrylic fibers. Acid dyes can also be used in the coloring of leather, paper, inks, cosmetics, feather, wood, fur, soaps, food and so on.
Q: Which technique uses acidic dyes?
A: For the purpose of the synthesis of acid dyes, some chemical reactions are carried out, like diazotization, condensation, reduction, coupling and so on.
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