Acid dye
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 Blue 9
- CAS:
- 2650-18-2
- MF:
- C37H39N3O9S3
- Chemical Name:
- Acid Yellow 118
- CAS:
- 12270-05-2
- Chemical Name:
- Acid Brown 50
- CAS:
- 12269-86-2
- Structure:
- Chemical Name:
- Acid Black 26
- CAS:
- 6262-07-3
- MF:
- C32H21N5O7S2.2Na
- Structure:
- Chemical Name:
- disodium 3-[[5-chloro-2-(phenylmethoxy)phenyl]azo]-4-hydroxy-5-[[(p-tolyl)sulphonyl]amino]naphthalene-2,7-disulphonate
- CAS:
- 6826-53-5
- MF:
- C30H22ClN3Na2O10S3
- Chemical Name:
- Acid Red 260
- CAS:
- 12239-07-5
- Structure:
- Chemical Name:
- hydrogen bis[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxybenzene-1-sulphonamidato(2-)]chromate(1-)
- CAS:
- 30112-70-0
- MF:
- C32H27CrN10O8S2
- Chemical Name:
- Acid Green 68
- CAS:
- 61901-32-4
- Chemical Name:
- Acid Orange 154
- Chemical Name:
- Acid Mordant Orange G
- Chemical Name:
- ACID BROWN 420
- Structure:
- Chemical Name:
- disodium 5-(4-(4-sulphophenylazo)phenylazo)salicylate
- CAS:
- 3564-27-0
- MF:
- C19H12N4Na2O6S
- Chemical Name:
- Acid Orange 94
- CAS:
- 61724-28-5
- Chemical Name:
- Acid Blue 225
- CAS:
- 12216-97-6
- Chemical Name:
- Acid Green 40
- CAS:
- 12219-87-3
- Chemical Name:
- Acid Blue 7BF
- Structure:
- Chemical Name:
- Acid Yellow 44
- CAS:
- 2429-76-7
- MF:
- C34H33N6NaO10S2
- Chemical Name:
- ACID BLACK 235
- Chemical Name:
- Acid Blue D
- Chemical Name:
- Bentonite,calcium base
- Chemical Name:
- Acid Brown SS
- Structure:
- Chemical Name:
- ACID YELLOW 99
- CAS:
- 10343-58-5
- MF:
- C16H11CrN4NaO9S
- Chemical Name:
- Acid Violet 48
- CAS:
- 12220-51-8
- MF:
- C37H38N2Na2O9S2
- Structure:
- Chemical Name:
- ACID ORANGE 63
- CAS:
- 15792-50-4
- MF:
- C35H26N6Na2O10S3
- Structure:
- Chemical Name:
- Acid Black 241
- CAS:
- 84170-03-6
- MF:
- C28H23N10NaO9S2
- Chemical Name:
- Acid Blue BGL
- CAS:
- 88264-80-6
- MF:
- C22H16N3O6S.Na
- Structure:
- Chemical Name:
- disodium 2-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate
- CAS:
- 6359-95-1
- MF:
- C20H13ClN4Na2O7S2
- Chemical Name:
- 90 ACID VIOLET 90
- Structure:
- Chemical Name:
- Acid Violet 131
- CAS:
- 6262-05-1
- Chemical Name:
- C.I.Acid Yellow 110
- Structure:
- Chemical Name:
- Acid Blue 158
- CAS:
- 6370-08-7
- MF:
- C20H10CrN2NaO9S2-
- Structure:
- Chemical Name:
- sodium [3-[[3-[(3-amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-4-hydroxybenzenesulphonato(3-)]cuprate(1-)
- CAS:
- 13011-68-2
- MF:
- C18H11CuN6NaO8S
- Structure:
- Chemical Name:
- disodium 2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate
- CAS:
- 12220-64-3
- MF:
- C20H12Cl2N4Na2O7S2
- Chemical Name:
- Acidic sanding agent
- Chemical Name:
- C.I.Acid Blue 350
- Chemical Name:
- C.I.Acid Blue 25
- Chemical Name:
- C.I.Mordant Green 17
- Chemical Name:
- Mitsui
- Structure:
- Chemical Name:
- ACID VIOLET 5
- CAS:
- 10130-48-0
- MF:
- C25H23N4NaO10S3
- Structure:
- Chemical Name:
- MORDANT BROWN 4
- CAS:
- 6247-27-4
- MF:
- C13H12N6O5
- Structure:
- Chemical Name:
- ACID BLACK 2
- CAS:
- 80316-29-6
- MF:
- C48H35N9
- Structure:
- Chemical Name:
- Acid Black 58
- CAS:
- 12218-94-9
- MF:
- C40H35CrN6O12S2
- Structure:
- Chemical Name:
- hydrogen [4-[[4-(diethylamino)phenyl][4-[ethyl[(3-sulphonatobenzyl)amino]-o-tolyl]methylene]-3-methylcyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium, sodium salt
- CAS:
- 6505-30-2
- MF:
- C43H49N3O6S2.Na
- Chemical Name:
- Acid Brown K
- Chemical Name:
- ACID BROWN85 (C.I. 34900)
- CAS:
- 77031-30-2
- Chemical Name:
- Navy Blue GR
- Chemical Name:
- C.I.Acid Brown 121
- Chemical Name:
- Acid brilliant red
- Chemical Name:
- C.I.Acid Blue 45
- Chemical Name:
- C.I.Acid Green 3
- Chemical Name:
- C.I.Acid Red 444
- Chemical Name:
- C.I. Acid Orange 142
- CAS:
- 61901-39-1
- Chemical Name:
- Acid Scarlet Red
- Structure:
- Chemical Name:
- Acid Black 242
- CAS:
- 152521-11-4
- MF:
- C34H28N11NaO11S3
- Chemical Name:
- Acid Yellow PL
- Chemical Name:
- C.I. Acid blue 72
- CAS:
- 12219-17-9
- Structure:
- Chemical Name:
- ACID BROWN 14
- MF:
- C26H16N4Na2O8S2
- Chemical Name:
- Acid Brown N2R
- Structure:
- Chemical Name:
- ACID BLUE 80
- CAS:
- 4474-24-2
- MF:
- C32H31N2NaO8S2
- Structure:
- Chemical Name:
- CI 11875
- CAS:
- 6247-28-5
- MF:
- C13H10N4O6
- Structure:
- Chemical Name:
- disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate
- CAS:
- 6360-07-2
- MF:
- C18H17N4NaO8S2
- Structure:
- Chemical Name:
- disodium 8-[[3,3'-dimethoxy-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate
- CAS:
- 6548-30-7
- MF:
- C37H28N4Na2O12S3
- Structure:
- Chemical Name:
- Acid Black 210
- CAS:
- 99576-15-5
- MF:
- C34H28KN11O11S3
- Structure:
- Chemical Name:
- Acid Brown 121
- CAS:
- 6487-04-3
- MF:
- C28H19N8NaO14S2
- Chemical Name:
- AcidChromeBlue
- Chemical Name:
- LEATHERSPRAYINGBLUERL
- CAS:
- 12269-81-7
- MF:
- [C32H18H6O8.Cr.Na];[C32H18N6O8.Co.Na]
- Chemical Name:
- C.I. Acid violet 66
- CAS:
- 12220-53-0
- Chemical Name:
- Acid Brown SLM
- Structure:
- Chemical Name:
- acid red 54
- CAS:
- 6360-03-8
- MF:
- C16H14N3NaO7S2
- Chemical Name:
- C.I.Acid Black 77
- Chemical Name:
- Acid Fruit Green
- Chemical Name:
- Acid Violet 4BS
- Chemical Name:
- Acid Complex Green B
- Chemical Name:
- C.I.Acid Blue 185
- Chemical Name:
- C.I.Mordant Green 17
- Chemical Name:
- Acid Black 8GB
- MF:
- C22H14O9N6Na2S2
- Structure:
- Chemical Name:
- Acid brown 97
- CAS:
- 108347-99-5
- MF:
- C18H12CuN6NaO10S*
- Chemical Name:
- Acid Leather Spray Black
- Chemical Name:
- C.I.Acid Brown 214
- Chemical Name:
- Acid Blue 221
- CAS:
- 12219-32-8
- Chemical Name:
- Acid Orange 116
- CAS:
- 12220-10-9
- MF:
- C25H21N4NaO4S
- Structure:
- Chemical Name:
- disodium 3,3'-[cyclohexylidenebis[(2-methoxy-4,1-phenylene)azo]]bis(4,6-dihydroxynaphthalene-2-sulphonate)
- CAS:
- 6459-69-4
- MF:
- C40H34N4Na2O12S2
- Chemical Name:
- Acid Green 54
- CAS:
- 61724-26-3
- Chemical Name:
- Acid Brown 97
- CAS:
- 61901-18-6
- Chemical Name:
- Acid Yellow 232
- Chemical Name:
- Acid Black BNG
- Chemical Name:
- Acid Blue 185
- Chemical Name:
- Acid Mordant Orange R
- MF:
- C13H9N3O5
- Structure:
- Chemical Name:
- Acid Red 111
- CAS:
- 6358-57-2
- MF:
- C37H31N4NaO10S3
- Chemical Name:
- CALCOCHROME FAST RED ECB
- Structure:
- Chemical Name:
- Acid Green 4
- CAS:
- 25424-72-0
- MF:
- C30H15FeN3NaO15S3(-2)
- Structure:
- Chemical Name:
- sodium 2-[3-(4-sulfonato-o-tolyliminio)-6-o-toluidino-3H-xanthen-9-yl]benzoate
- CAS:
- 6252-78-4
- MF:
- C20H10O2S
- Chemical Name:
- ACID BROWN 189
- CAS:
- 61724-15-0
- Chemical Name:
- ACID RED 252
- CAS:
- 61724-40-1
- Chemical Name:
- C.I.Acid Blue 25
- Structure:
- Chemical Name:
- Acid yellow 17
- CAS:
- 642-62-6
- MF:
- C16H9N4Na3O9S2
- Chemical Name:
- Navitan Green 5GL
- CAS:
- 12219-98-6
- Chemical Name:
- Acid Blue 183
- CAS:
- 12217-22-0
- Structure:
- Chemical Name:
- Tracid Red 2bs
- CAS:
- 57741-47-6
- MF:
- C17H12ClF3N3NaO4S
- Structure:
- Chemical Name:
- Acid Orange 33
- CAS:
- 6507-77-3
- MF:
- C34H31N4NaO8S2