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Acid dye

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Acid dye refers to the dyestuff containing a sulfonic acid group, a carboxyl, a hydroxy or other soluble group in the molecular structure and used in acid or neutral dye bath. According to the chemical structure it can be divided into azo type, triphenylmethane type, anthraquinone type, anthracene oxygen type and nitroso type pyrazolone type. Acid dyestuff is widely used, mainly as direct dyestuff for protein fibers (such as wool, silk) and polyamide fibers, protein. And the dyeing needs to be conducted in an acidic solution. It’s mainly used for nylon, wool, leather, silk and others. Direct dyes or basic dyes are applied in paper dyeing far more often than acid dyestuff.

According to the molecular structure and dyeing conditions of the acid dyestuff, it can be divided into strong acid dyes, weak acid dyes, acid mordant dyes, acid-premetallized dyes and neutral dyes. Acid dyestuff is mainly used for wool, silk, leather and nylon and other fibers with its vivid luster and wild chromatogram.

Strong acid dyes whose molecules are relatively small, have bright color and good levelness but a stronger affinity for the wool fibers, and need to be used in strong acidic dye bath (pH≤4). The main chemical structures of Strong acid dyes are azo, anthraquinone, triarylmethane and oxygen anthracene type. For example, acid Bright Yellow 2G (C. I. Acid Yellow 17), acid anthraquinone blue (C. I. Acid Blue 25), acid Lake Blue A (C. I. Acid Blue 7) and acid Rose Red B (C. I. Acid Red 52), etc. are all strong acid dyes.

Weak acid dyes have more complex molecules than strong acid dyes, and relatively less water-soluble groups. They have weaker affinity for wool fiber, and can be used in weakly acidic or nearly neutral dye bath. In addition to the ionic bonds between the anions of dyes and the cations of wool molecules, the two non-polar molecules combine by means of van der Waals attraction. So weak acid dyes have a poor levelness but an excellent wash fastness, therefore they are also known as milling dyes. The main chemical structures of weak acid dyes are the types of azo and anthraquinone. For example, weak acid black BR (C. I. Acid Black 24), weakly acidic Brilliant Blue RAW (C. I. Acid Blue 80) are weak acid dyes.

After treated by metal mordant (Chromium salts), acid mordant dyes generate the dye-metal complex on the fiber, which can improve their resistance to sunlight exposure and wetness. But such treatment will leave the dyed products in a darker hue, make their shade and color-matching less manageable and complicate the dyeing procedures.

Acidic metal complex dyes are a class acid dyes that can generate inner complex with some transition metals (such as copper, network, cobalt, etc.). In contrast with acid mordant dyes, acidic metal complex dyes generate the dye-metal complex with complexing agent first, and then dye the fiber, which is simpler than the dyeing procedure of acid mordant dyes.

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Structure:
Chemical Name:
Acid Orange 7
CAS:
633-96-5
MF:
C16H11N2NaO4S
Structure:
Chemical Name:
Tartrazine
CAS:
1934-21-0
MF:
C16H9N4Na3O9S2
Structure:
Chemical Name:
Acid Brown 14
CAS:
5850-16-8
MF:
C26H16N4Na2O8S2
Structure:
Chemical Name:
Acid Red 87
CAS:
548-26-5
MF:
C20H6Br4Na2O5
Structure:
Chemical Name:
Acid Red 27
CAS:
915-67-3
MF:
C20H11N2Na3O10S3
Structure:
Chemical Name:
Acid Blue 119
CAS:
1324-80-7
MF:
C21H14NNaO6S
Structure:
Chemical Name:
Fuchsin Acid
CAS:
3244-88-0
MF:
C20H17N3Na2O9S3
Structure:
Chemical Name:
LIGHT GREEN SF YELLOWISH
CAS:
93942-43-9
MF:
C37H34N2Na2O9S3
Structure:
Chemical Name:
ACID BLUE 113
CAS:
3351-05-1
MF:
C32H21N5Na2O6S2
Structure:
Chemical Name:
Acid Green 50
CAS:
3087-16-9
MF:
C27H25N2NaO7S2
Structure:
Chemical Name:
Acid Green 25
CAS:
4403-90-1
MF:
C28H20N2Na2O8S2
Structure:
Chemical Name:
ACID RED 88
CAS:
1658-56-6
MF:
C20H13N2NaO4S
Structure:
Chemical Name:
ACID RED 151
CAS:
6406-56-0
MF:
C22H15N4NaO4S
Structure:
Chemical Name:
Acid blue 1
CAS:
129-17-9
MF:
C27H31N2NaO6S2
Structure:
Chemical Name:
Acid Orange 10
CAS:
1936-15-8
MF:
C16H10N2Na2O7S2
Structure:
Chemical Name:
ORANGE I
CAS:
523-44-4
MF:
C16H11N2NaO4S
Structure:
Chemical Name:
Acid Red 92
CAS:
18472-87-2
MF:
C20H2Br4Cl4Na2O5
Structure:
Chemical Name:
Acid Green 1
CAS:
19381-50-1
MF:
C30H15FeN3Na3O15S3
Structure:
Chemical Name:
METANIL YELLOW
CAS:
587-98-4
MF:
C18H14N3NaO3S
Structure:
Chemical Name:
Acid Blue 129
CAS:
6397-02-0
MF:
C23H19N2NaO5S
Structure:
Chemical Name:
Xylenol Orange sodium salt
CAS:
63721-83-5
MF:
C31H31N2NaO13S
Structure:
Chemical Name:
Direct Black GB
CAS:
12220-20-1
MF:
C31H25N5Na2O6S2
Structure:
Chemical Name:
Tracid Red Bs
CAS:
15792-43-5
MF:
C30H37N3Na2O8S2
Chemical Name:
Acid Blue 264
CAS:
39315-90-7
MF:
C29H24N3O7S2.Na
Structure:
Chemical Name:
Acid Orange 156
CAS:
68555-86-2
MF:
C21H19N4NaO5S
Chemical Name:
Acid Black 168
CAS:
12238-87-8
MF:
[C38H23N6O10S.Cr.2Na];[C36H20N5O9S.Cr.2Na]
Structure:
Chemical Name:
Acid Black 1
CAS:
1064-48-8
MF:
C22H14N6Na2O9S2
Structure:
Chemical Name:
AMIDO GREEN BLACK B
CAS:
5850-39-5
MF:
C22H16N6Na2O7S2
Structure:
Chemical Name:
Acid Blue 83
CAS:
6104-59-2
MF:
C45H44N3NaO7S2
Structure:
Chemical Name:
Acid Violet 17
CAS:
4129-84-4
MF:
C41H44N3NaO6S2
Structure:
Chemical Name:
CI 63010
CAS:
2861-02-1
MF:
C14H8N2Na2O10S2
Structure:
Chemical Name:
ACID RED 97 (C.I. 22890)
CAS:
10169-02-5
MF:
C32H20N4Na2O8S2
Structure:
Chemical Name:
Acid Yellow 49
CAS:
12239-15-5
MF:
C16H13Cl2N5O3S
Structure:
Chemical Name:
Acid Black 234
CAS:
157577-99-6
MF:
C34H26N10Na2O9S3
Structure:
Chemical Name:
Tracid Brilliant Red B
CAS:
6416-66-6
MF:
C29H20ClN3Na2O10S3
Chemical Name:
Acid Black ATT
Structure:
Chemical Name:
SULFORHODAMINE G
CAS:
5873-16-5
MF:
C25H25N2NaO7S2
Structure:
Chemical Name:
Acid Blue 90
CAS:
6104-58-1
MF:
C47H48N3NaO7S2
Structure:
Chemical Name:
Aniline Blue
CAS:
28631-66-5
MF:
C32H27N3O9S3.2Na
Structure:
Chemical Name:
ACID GREEN 41
CAS:
4430-16-4
MF:
C28H20N2Na2O10S2
Structure:
Chemical Name:
ACID RED 13
CAS:
2302-96-7
MF:
C20H12N2Na2O7S2
Structure:
Chemical Name:
ACID BLUE 1
CAS:
116-95-0
MF:
C27H31N2NaO6S2
Chemical Name:
Tracid Brilliant Red 10b
CAS:
11097-74-8
MF:
C37H11N3S3O11Na2
Structure:
Chemical Name:
ACID VIOLET 7
CAS:
4321-69-1
MF:
C20H16N4Na2O9S2
Structure:
Chemical Name:
Acid Red 18
CAS:
2611-82-7
MF:
C20H11N2Na3O10S3
Structure:
Chemical Name:
Acid chrome blue K
CAS:
3270-25-5
MF:
C16H9N2Na3O12S3
Structure:
Chemical Name:
Orange IV
CAS:
554-73-4
MF:
C18H14N3NaO3S
Structure:
Chemical Name:
Eriochrome Black T
CAS:
1787-61-7
MF:
C20H12N3NaO7S
Structure:
Chemical Name:
Acid Red 94
CAS:
632-69-9
MF:
C20H2Cl4I4Na2O5
Structure:
Chemical Name:
ACID BLUE 120
CAS:
3529-01-9
MF:
C33H23N5Na2O6S2
Structure:
Chemical Name:
ORANGE G
CAS:
1936-96-5
MF:
C6H9NS
Structure:
Chemical Name:
CI 13015
CAS:
2706-28-7
MF:
C12H9N3Na2O6S2
Structure:
Chemical Name:
EOSIN
CAS:
17372-87-1
MF:
C20H6Br4Na2O5
Structure:
Chemical Name:
Acid Yellow 220
CAS:
70851-34-2
MF:
C46H32Cl2CoN8Na4O14S2
Structure:
Chemical Name:
ACID RED 60
CAS:
5850-64-6
MF:
C20H14N2O11S3
Chemical Name:
Tracid Rubine 5bl
CAS:
12220-29-0
MF:
C26H24N5O5S.Na
Structure:
Chemical Name:
Acid Orange 24
CAS:
1320-07-6
MF:
C20H17N4NaO5S
Structure:
Chemical Name:
Acid Orange 67
CAS:
12220-06-3
MF:
C26H21N4NaO8S2
Chemical Name:
Acid Yellow 116
CAS:
12239-18-8
MF:
C217H15IN4O5S
Chemical Name:
Acid Red 131
CAS:
12234-99-0
Structure:
Chemical Name:
Acid Yellow 4R
CAS:
12715-61-6
MF:
C32H30CoN8O10S2
Structure:
Chemical Name:
SULFORHODAMINE B
CAS:
3520-42-1
MF:
C27H29N2NaO7S2
Structure:
Chemical Name:
EOSIN Y
MF:
C20H8Br4O5
Chemical Name:
Acid Yellow 219
CAS:
71819-57-3
MF:
C20H17N4NaO5S
Chemical Name:
Acid Black 172
CAS:
61847-77-6
MF:
C40H24N6O14S2.Cr.2Na
Structure:
Chemical Name:
ACID RED 106
CAS:
6844-74-2
MF:
C23H17N3Na2O9S3
Structure:
Chemical Name:
ACID RED 1
CAS:
3734-67-6
MF:
C18H13N3Na2O8S2
Chemical Name:
ACID BLACK NT
Structure:
Chemical Name:
Acid Yellow 42
CAS:
6375-55-9
MF:
C32H24N8Na2O8S2
Chemical Name:
Acid Yellow 220
CAS:
71603-79-7
MF:
C24H18IN4NaO7S
Chemical Name:
Acid Brown 440
CAS:
93376-15-9
MF:
C34H21N8Na3O14S3
Structure:
Chemical Name:
CROCEIN SCARLET 7B
CAS:
6226-76-2
MF:
C24H18N4Na2O7S2
Structure:
Chemical Name:
AMMONIUM HYDROGEN TARTRATE
CAS:
3095-65-6
MF:
C4H6O6.H3N
Structure:
Chemical Name:
ACID BLUE 62
CAS:
4368-56-3
MF:
C20H20N2O5S
Structure:
Chemical Name:
C.I. 14720
CAS:
3567-69-9
MF:
C20H12N2Na2O7S2
Structure:
Chemical Name:
SOLWAY BLUE RN
CAS:
4403-89-8
MF:
C22H17N2NaO5S
Chemical Name:
VITAMIN FOLIC ACID ASSAY MEDIUM
Structure:
Chemical Name:
Zirconium oxide sulfate
CAS:
62010-10-0
MF:
O5SZr
Structure:
Chemical Name:
Acid Red 57
CAS:
12217-34-4
MF:
C24H22N4O6S2
Chemical Name:
Acid Brown 282
CAS:
12219-65-7
Chemical Name:
Acid Brown 349
CAS:
72827-73-7
Chemical Name:
Acid Brown 161
CAS:
61724-13-8
Chemical Name:
Acid Green 73
CAS:
12219-93-1
Chemical Name:
Acid Blue 168
CAS:
12219-24-8
MF:
C20H15CuN5O5S
Chemical Name:
Acid Brown 163
Chemical Name:
Acid Brown 165
CAS:
61724-14-9
Structure:
Chemical Name:
ACID RED 9
CAS:
8003-59-6
MF:
C20H13N2NaO4S
Structure:
Chemical Name:
ALIZARIN ASTROL
CAS:
6408-51-1
MF:
C22H17N2NaO5S
Structure:
Chemical Name:
ACID BLACK 48
CAS:
1328-24-1
MF:
C28H18N3NaO7S
Structure:
Chemical Name:
ACID GREEN 27 (C.I. 61580)
CAS:
6408-57-7
MF:
C34H32N2O8S2.2Na
Structure:
Chemical Name:
AZOFUCHSIN
CAS:
3567-66-6
MF:
C16H11N3Na2O7S2
Chemical Name:
Acid Black 2
CAS:
8005-03-6
MF:
NULL
Structure:
Chemical Name:
Acid Orange 3
CAS:
6373-74-6
MF:
C18H13N4NaO7S
Chemical Name:
Acid Yellow 110
CAS:
12220-74-5
Chemical Name:
Neutral Brown Rl
CAS:
12238-94-7
MF:
C15H14O5
Chemical Name:
Acid Red 361
CAS:
61931-22-4
Structure:
Chemical Name:
Acid violet 90
CAS:
6408-29-3
MF:
C40H27CrN8O10S2.2Na
Structure:
Chemical Name:
Acid Yellow 117
CAS:
6459-70-7
MF:
C39H30N8O8S2.2Na
Structure:
Chemical Name:
Acid Brown 75
CAS:
8011-86-7
MF:
C10H9NO7S2
Structure:
Chemical Name:
disodium 6-amino-4-hydroxy-5-[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2-sulphonate
CAS:
6441-91-4
MF:
C16H10N4Na2O9S2