Acid dye click here
Properties of acid dye click here
Classification of acid dye click here
Theory of dyeing of acid dye click here
The classification of acid dyes are varies way they are
described below:
A) According
to the application:
Class-1 : Strong acid dye
Class-2 : Weak
acid dye
Class-3 : Natural acid dye
Class-1(Strong acid dye):
i.
Good leveling property.
ii.
Good light fastness.
iii.
Wet fastness is also well
iv.
During dyeing pH maintained 2-3
v.
Example of strong acid H2SO4.
vi.
HCl is normally used in dyeing
Class-2(Weak acid dye):
i.
These are less level dyeing.
ii.
Well wet fastness.
iii.
PH 5.2-6.2 is maintained.
iv.
Cellulose fibres can be dyed.
v.
Weak organic acid is used such as CH3COOH.
vi.
Glaubers salt should not be used
Class-3(Neutral acid dye):
i.
Applied in neutral bath.
ii.
Good light fastness
iii.
Not leveling dyeing
iv.
Wet fastness good.
v.
lower temperature used
B ) According to the chemical structure:
i.
Nitro:
Group – NO2
Example : Naphthl Yellow
ii.
Nitroso:
Group : -NO
Example : Naphthol Green B
iii.
Mono azo :
Group : -N=N-
Example : Mentanil Yellow
iv.
Di-azo:
Example :Cloth Red G
v.
Tri pkenyl methane:
Example : Acid Magenta
vi.
Xanthene :
Example : Lissamine Rhodamine B
vii.
Azine :
Example :
Royal Fast Blue EB
viii.
Quinoline :
Example : Quinoline Yellow PN
ix.
Anthraquinone :
Example : Carbolan Green G
C ) according to the dyestuff particles:
1) Molecular
Split acid dyes.
Example : Acid Orange GG, Alizarine Light Blue etc
2) Aggregated
acid dyes. Example : Polar Yellow R
Trade Name of Acid Dyes:
Trade Name
|
Manufacturer
|
Country
|
Xylene
|
L.B. Holiday & Co.
|
UK
|
Anthralan
|
Hoechst
|
Germany
|
Kiton
|
Ciba-geigy
|
Switzerland
|
Sulfonine
|
ICI
|
UK
|
Supranol
|
Bayer
|