Experiment Name: Dyeing of 100% Jute fabric with Basic dye.
Theory: Basic Dyes are cationic soluble salts of coloured bases. Basic dyes are applied to substrate with anionic character where electrostatic attractions are formed. Basic dyes are not used on cotton as the structures are neither planar nor large enough for sufficient substantivity or affinity. Basic dyes are called cationic dyes because the chromophore in basic dye molecules contains a positive charge. The basic dyes react on the basic side of the isoelectric points. Basic dyes are salts, usually chlorides, in which the dyestuff is the basic or positive radical. Basic dyes are powerful colouring agents. It’s applied to wool, silk, cotton and modified acrylic fibres.
Nature of Sample : 100% Jute Woven fabric.
1. Beakers.
2. Glass Rod.
3. Pipette.
4. Measuring Cylinder.
5. Digital Balance.
6. Tri-pod Stand.
7. gas burner.
8. Thermometer.
9. Pot.
10. pH Meter.
Process Sequence:
Collection of pre-treated 100% Jute sample
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Dyeing with Basic dye at 100deg C for 20 Minutes
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After Treatment
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cold rinsing
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hot wash
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cold rinsing
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drying
Recipe:
Basic Dye: 1% Owf (Stock Solution - 1%)
Wetting Agent: 1 g/L (Stock Solution - 1%)
Acetic Acid: 0.8 g/L (Stock Solution - 2%)
Temperature:100deg C
Time: 20 minutes
pH: 4.5 - 5.5
Fabric Weight: 5gm
M:L = 1:30
Calculation:
Total Liquor required
Fabric Weight = 5gm
M: L = 1:30
Required amount of liquor = 5 X 30
= 150mL
Basic Dye :
= (5 X 1%) / (1%)
= 5ml
Acetic Acid : 0.8g/L
= (150 X 0.8 g/L) / (1% x 1000)
= 12ml
Wetting Agent : 0.8g/L
= (150 X 0.8 g/L) / (1% x 1000)
= 12ml
Initial Water required = Total liquor - Chemicals
= 150 - (12+12+5)
= 150-29 mL
= 121 mL
Function of Chemicals:
Wetting Agent:
Wetting agent is substances that reduce the surface tension of water to allow it to spread drops onto a surface, increasing the spreading abilities of a liquid. Lowering the surface tension lowers the energy required to spread drops onto a film.
Basic Dye:
The main substance to color the sample.
Acetic Acid:
Acetic acid used for maintain pH 4.5-5.5. Because the Basic dye require acidic medium.
Process Curve :
Sample Attachment and Observation:
Dyed Jute Fabric
Comments: The Jute fabric achieve color after dyed by Basic Dye..
Pre-cautions:
- All chemicals measure are taken properly.
- Temperature maintain properly.
- Burner used very carefully.
- Time maintain according to recipe.
Conclusion:.....................................
