GENERAL
TECHTHRENE vat dyestuff has been grain appearance.The particles of vat dyestuffs in this form have been ground to extremely small with the help of most modern techciques.Dustproof property is eximious.These powders are easily dispersible and suitable for dyeing cotton yarns packages and cotton piece goods by batch wise and continuous dyes methods.
APPLICATION
1.Procedure
1.1Exhaust dyeing methods
1.1.1Exhaust dyeing
Wetting with water →Dyeing →Washing with cold water →Oxidizing →Washing with cold water →Soaping →Washing with cold water →Washing with cold water →Hydro extracting →Drying
1.1.2Jig dyeing
Wetting with water →Dyeing →Washing with cold water →Oxidizing →Soaping →Washing with cold water →Washing with cold water
1.1.3Dyeing recipes
M:L ratio 1:50
Table 1
Dyeing condition
Dyeing Method 
IN
IW
IK
Amount of dyestuff o.w.f.%
0.1-1
1-3
3-6
0.1-1
1-3
3-6
0.1-1
1-3
3-6
Caustic soda 30%(mL/L)
10-12
12-17
17-20
6-8
8-12
12-14
5-7
7-9
9-11
Hydrosulphite 85%(g/l)
4-5
5-7
7-8
3.5-4.5
4.5-6.5
6.5-7
3.5-4.5
4.5-6.5
6.5-7
Wetting agent 10%(mL/L)
5
5
5
5
5
5
5
5
5
Alcohol 95%(mL/L)
5
5
5
5
5
5
5
5
5
Sodium sulfate adhydrous(g/L)
-
-
-
5-10
10-15
15-25
8-15
15-25
25-35
Reduction temp.
60
50
50
Dyeing temp.
60
50
25
 
Table 2
Dyeing condition
Dyeing Method 
IN spl.
SRI
SR II.
Amount of dyestuff o.w.f.%
0.1-1
1-3
3-6
0.1-1
1-3
3-6
0.1-1
1-3
3-6
Caustic soda 30%(mL/L)
15-17
17-22
22-26
6-8
12-14
22-25
25-32
25-32
32-38
Hydrosulphite 85%(g/l)
4-5
5-7
3.5-4.5
4.5-6.5
4.5-6.5
6.5-7
3-5
5-8
6-12
Wetting agent 10%(mL/L)
5
5
5
5
5
5
5
5
5
Alcohol 95%(mL/L)
5
5
5
5
5
5
5
5
5
Sodium sulfate adhydrous(g/L)
-
-
-
-
-
-
-
-
-
Reduction temp.
60
80
60
Dyeing temp.
60
60
80
 
1.1.4 Stock vat recipes
Process
I
II
III
Liquor ratio
1:50
1:50
1:100
Caustic soda 30%(mL/L)
60
30
60
Hydrosulphite 85%(g/L)
15
10
15
Reduction temp.
60
50
60
Reduction time(min)
10-15
10-15
10-15
 
1.1.5 Oxidizing bath recipes
Method
Hydrogen peroxide 30%
Sodium perborate
Potassium bichromate
Amount
2-3mL/L
3-4g/L
1-2g/L
Glacial acetic acid
2-3mL/L
--
1-2mL/L
PH value
6-7
10-11
--
Temp.( ℃ )
20-40
40-50
30-40
Time(mins)
10-20
10-20
10-20
 
1.1.6 Soaping bath recipes
Soap(g/L)
3-5
Temp.(℃)
95-100
Sodium carbonate(g/L)
2-3g/L
Time(min)
10-12
 
1.2 Pad-steam process
Pigment padding →Drying →Cooling →Chemicals liquor padding →Steaming →Washing with cold water →Oxidizing →Washing →Soaping →Washing →Drying
1.2.1 Pad-teaming recipes
Dyeing depth
Caustic soda(g/L)
Hydrosulphite 85%(g/L)
Common salt or Sodium sulfate anhydrous(g/L)
Steaming time(sec)
Steam temp.(℃)
Pale-medium
15-30
15-30
15-20
45-60
102-104
Medium-deep
30-50
30-50
20-30
 
2.Pigment printing process
Printing →Drying →Chemicals liquor padding →(130℃,20-40sec)Quick steaming →Washing →Oxidizing →Soaping →Washing →Drying
 
2.1.1 Colour paste recipes
Vat dyes(g)
Syuthetic gum gragacanth -Starch paste(g)
Water(mL)
Total amount(g)
X
500-700
Y
1000
 
2.1.2 Chemicals liquor vatting
I
II
III
Hydrosulphite 85%(g)
90
40-80
60-90
1.33g/mL Caustic soda(mL)
48
80-140
-
Borax(g)
15
-
10-20
Sodium carbonate(g)
40
50
60-100
Starch paste(g)
-
100
-
Total amount(mL)
1000
1000
1000
 
 
3.Remark:
R-Redder G-Greener Y-Yellower B-Bluer L-Lighter D-Deeper