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Colorant is the newest
constellation in the universe offering colorants
& speciality chemicals to Textile, Leather
& other industries.
Colorant offers the widest
range of Reactive dyes for dyeing and printing
of cellulosic substrate.
This shade card gives
technical information on our "COLRON"
range of Reactive Dyestuffs and methods
generally applied to.
Introdution :
Colron reactive Based
dyes are classified as :
- Vinyl Sulphone
Based Dyes
Having Moderate reactivity and are
popularly used for printing and dyeing
by silicate pad batch method and are mostly
dischargeable.
- Cyanuric chloride
Based Reactive Dyes
- 'H' Dyes : Having Moderate reactivity
mild fixation condition. Primarily
used for printing of c..cellulosic
substrate.
- 'M' Dyes :
Highly Reactive,
requiring mild fixation condition
commonly used Exhaust .....Dyeing.
- 'HE' Dyes : Specially developed
for Exhaust Dyeing.
- Bifunctional
'ME' type Dyes : Specially developed
for exhaust dyeing.
A) General
Dye Solution :
Reactive Dyes are dissolved by
pasting it with a little water and pouring
boiling hot water over it under stirring.
The water used should be neutral. One gramper
litre of Sodium Hexa Meta Phosphate may
be added if the water is hard.
Fabric :The
fabric to be dyed should be throughly boiled,
desized, bleached and made highly absorbent
and neutral in pH to get good results. For
deeper shades in cotton, the material is
to be either mercerized or causticised with
28 Be' caustic solution. For viscose, caustic
treatment may be made with 6 ot 8 Be' caustic
solution. The treated material, in all cases
should be made neutral prior to use.
B) V.S. Based
Reactive Dyes
Exhaust Dyeing
:
Jig Dyeing :
In this method the dyebath is heated to
about 5C above the recommended temperature
to get the desired temperature on the material.
Dye solution and additives are added as
under :
| 1st End |
Half amount of dye + Half amount of
salt |
| 2nd End |
Remaining quantity of dyestuff and
salt |
| 3rd End |
Half amount of Alkali |
| 4th End |
Balance amount of Alkali |
Dyeing at 40C
- Dyeing time 90 minutes
| Liquor Ratio |
1:2 to 1:3 |
1:4 to 1:6 |
| Glauber's Salt |
g/l |
50 |
50 |
| 30% Gaustic Solution & Soda Ash |
ml/l
g/l |
4-6
5 |
3-4
5 |
| Or Trisodium Phosphate |
g/l |
- |
30 |
Dyeing at 60C
- Dyeing time 60 minutes :
| Liquor Ratio |
1:2 to 1:3 |
1:4 to 1:6 |
| Glauber's Salt |
g/l |
50 |
50 |
30% Gaustic Solution &
Soda Ash |
ml/l
g/l |
3-6
5 |
2-3
5 |
| Or Trisodium Phosphate |
g/l |
30 |
20-25 |
Notes :
- For Reactive Turquoise
Blue G, dyeing is carried out at 80°C,
using 50 g/l Glauber's Salt and 15 to
20 g/l Soda Ash along with 3-5 g/l Caustic
Soda (72°Tw) in last 2 ends at same
temp.
- For Reactive Yellow
FG, Red C2G and Red 5B are generally not
recommended for this method however using
80 g/l Glauber's salt gives better colour
yield.
- In case of Reactive
Brilliant Blue R (Spl.) only 1 qtr. of
required salt is added over 1st &
2nd ends. The remaining salt is added
only after the addition of alkali.
After Treatement
: Following aftertreatement are
recommended :
| Cold rinse with overflow |
2 Ends |
| Heutralise at 40C with 2-3 ml/lit
60% Acetic Acid |
2 Ends |
| Hot rinsing (60-70°C) |
2 Ends |
| Soaping at boil with neutral detergent |
2 Ends |
| Hot rinsing (80°C or more) with
change of bath water |
2-4 Ends |
| Cold rinse |
1-2 Ends |
B.2 Winch Dyeing
: Dyestuff and salt are added to
the dye batch (25-30°C) Alkali is then
added Bath is heated to the recommended
temperature within 20-30 minutes. Dyeing
is carried out at 40°C for 90 minutes
or at 60°C for 60 minutes.
| Liquor Ratio |
1:15 to 1:3 |
| Glauber's Salt |
g/l |
50 |
| 30% Gaustic Solution & |
g/l |
1-2 |
| Soda Ash |
g/l |
5 |
| Or Trisodium Phosphate |
g/l |
10-15 |
The aftertreatment is
similar to that given under Jig Dyeing :
Notes :
- For Reactive Turquoise
Blue G 80°C and 60 minutes dyeing
give better results.
- Re. Turquoise Blue
G give higher colour yield by using 80
g/l Glauber's Salt.
- Reactive Yellow FG,
Red C2G & Red 5B exhausts poorly and
therefore are not recommended for higher
liquor ratios.
B.2. Padding Process
:
B.2.1 One Bath
Pad - Batch Process : This process
can be used for dyeing all Cellulosic fabrics.
The process consists of :
| a)
Padding |
Here dye is picked up
by the fabric |
| b) Batching |
Dye is fixed |
| c) Aftertreatment |
To remove unfixed dyestuffs. |
B.2.1.1 Preparationg
of Padding Liquor : The Dye is
dissolved by pouring small quantity of boiling
water under stirring. This is then diluted
with cold water. Urea is added below 40°C.
Quantity of Urea
to be added :
| Strength of Dye Solution |
Upto 20 g/l |
20 to 35 g/l |
| Urea |
100 g/l |
200 g/l |
Required quantity of Sodium
Silicate and Caustic Soda are added to the
padding solution in dilute form just prior
to entering the fabric. The quantity of
caustic required for various grades of Sodium
Silicates are tabulated below :
Standard Method
: Salt & Alkali Requirements :
Depth
of Shade
(% on weight of goods) |
Soda
Ash (g/l) |
| Salt
(g/l) |
L.R.
15:1 |
L.R.
20:1 |
L.R.
30:1 |
| Upto 0.5 |
25 |
5 |
3 |
2 |
| 0.5 to 2.0 |
35 |
5 |
4 |
2 |
| 2.0 to 4.0 |
45 |
10 |
8 |
4 |
| Above 4.0 |
55 |
15 |
10 |
5 |
Soaping after
Exhaust Dyeing : For maximum Fastness
it is necessary to wash off efficiently.
| Minutes |
Drop Dyebath |
| 10 |
Rinse Cold |
| 10 |
Rinse Cold |
| 15-30 |
'Soap' at the boil for heavy shades
two 15 min. |
| |
'Soap' are preferred |
| 10 |
Rinse warm (50°C) |
| |
Rinse cold untill clear |
C.2 Exhaust Dyeing
: Jig Dyeing :
- Set the bath at 30-40°C
- Add dissolved dye over
two ends.
- Add salt over two ends
- Run for a minimum of
30 minutes (2 ends or more)
- Add alkali over two
ends
- Run for a further 30-60
minutes (4 ends or more)
- Rinse thoroughly and
wash off
Jig Dyeing : Salt and
Alkali Requirements
| Depth of Shade
(% on weight of goods) |
Salt
(g/l) |
Soda
Ash (g/l) |
| Upto 0.5 |
25 |
5 |
| 0.5 to 2.0 |
35 |
10 |
| 2.0 to 4.0 |
45 |
15 |
| Above 4.0 |
55 |
20 |
D. Reactive 'HE' / 'H'
Dyes
D.1 Exhaust Dyeing
Reactive 'HE'
/ 'H' Dyes : Salt & Alkali
Requirements
| Depth of Shade
(% on weight of goods) |
Salt
(g/l) |
Soda
Ash (g/l) |
| Upto 0.5 |
30 |
10 |
| 0.5 to 2.0 |
45 |
15 |
| 1.0 to 2.0 |
60 |
15 |
| 2.0 to 4.0 |
70 |
20 |
| Above 4.0 |
90 |
20 |
Soaping after
Exhaust Dyeing : The washing off
sequence is similar to that given for Reactive
'M' Dyes.
E. Printing :
Both one phase and two phase methods
can be used. A typical printing receipe
is given below :
| Ingredients, parts |
Cold Brand |
Hot Brand |
| Dyestuffs |
10-60 |
10-60 |
| Urea |
40-60 |
40-60 |
| Alginate Thickening (4.0%) |
350-400 |
400 |
| Resist Salt |
40 |
40 |
| Sodium Bicarbonate |
10-12 |
15-30 |
| Water |
Balance |
Balance |
| Total |
1000 |
1000 |
Mix the dye with urea
and near boiling water.Cool to room temperature.
Add Alginate thickening and Resist Salt.
Mix well. Alkali is to be added just prior
to printing. If necessary sieve through
fine muslin cloth.
Print the cloth with above
paste. Dry and steam for 15-20 minutes in
Star-Ager or for 5-7 minutes in continuous
Ager at 100-102°C, give a cold and hot
wash with water. Soap at boil with neutral
soap and wash again.
F. Reactive 'ME'
Dyes
F.1 Exhaust Dyeing : Jig
Dyeing
In this method the dyebath
is heated to about 5°C above the recommended
temperature to get the desired temperature
on the material. Dye solution and additives
are added as under :
| 1st End |
Half amount of dye + Half amount of
salt |
| 2nd End |
Remaining quantity of dyestuff and
salt |
| 3rd End |
Half amount of Alkali |
| 4th End |
Balance amount of Alkali |
Dyeing at 40°C
- Dyeing time 90 minutes :
| Liquor Ratio |
1:2 to 1:3 |
1:4 to 1:6 |
| Glauber's Salt |
g/l |
50 |
50 |
30% Gaustic Solution &
Soda Ash |
ml/l
g/l |
4-6
5 |
3-4
5 |
| Or Trisodium Phosphate |
g/l |
- |
30 |
Dyeing at 60C- Dyeing time 60 minutes :
| Liquor Ratio |
1:2 to 1:3 |
1:4 to 1:6 |
| Glauber's Salt |
g/l |
50 |
50 |
30% Gaustic Solution &
Soda Ash |
ml/l
g/l |
3-6
5 |
2-3
5 |
| Or Trisodium Phosphate |
g/l |
30 |
20-25 |
After Treatment
: The after treatment is similar
to that given under Jigger dyeing for US
Based Reactive Dyes.
Key to Abbreviations
:
| Y |
Yellower |
| R |
Redder |
| Br |
Brighter |
| L |
Low |
| H |
High |
| LS |
Less Suitable |
| G |
Greener |
| BI |
Blackish |
| D |
Duller |
| M |
Medium |
| S |
Suitable |
| NS |
Not Suitable |
| Light |
1 to 8 in increasing order |
| Washing & other |
1 to 5 increasing order |
| Dischargeability |
G-Good; F-Fair; P-Poor. |
Pattern illustration
: 'V.S.' & 'H' Dyes are dyed
by pad-batch method & 'M', 'HE' &
'ME' Dyes by exhaust mehtod on mercerised
cotton poplin.
'V.S.', 'M', 'HE' &
'ME' Dyes on unmercerised cotton hosiery
by exhaust method.
'H' Dyes are printed on
mercerised cotton poplin by print-Dry-Pad
silicate Method.
(The information in this
shade card is given in good faith but without
warranty).
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