project - part 2
Post on 18-Feb-2017
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DYEING WITH VAT DYEDYEING WITH VAT DYE
11
RECIPE OF EACH (10GM) KNIT & WOVEN SAMPLE DYESTUFF:
Option 1: Vat dye, Blue color : 1% on the weight of fabricOption 2: Vat dye, Blue color : 2% on the weight of fabricOption 3: Vat dye, Yellow color : 1% on the weight of fabricOption 4: Vat dye, Yellow color : 2% on the weight of fabric
CHEMICALS & AUXILIARIES:NaOH : 7% on the weight of fabricHydrose : 6% on the weight of fabricSalt (NaCl) : 10% on the weight of fabricWetting agent (1% stock soln) : 1 g/lSequestering agent (1% stock soln) : 1 g/lWater : Required amount as calculated below
DYEING PARAMETER:pH : 12M:L : 1:30Temperature x Time : 70˚C x 45 min
22
DYEING CURVE
33
OXIDATION AND AFTER TREATMENT OXIDATION RECIPE
When Air oxidation = No mentionable amount as available in environmentWhen H2O2 = 2 gm/l
When Na-perborate = 2 gm/lWhen K2Cr2O7 = 2 gm/l
M:L = 1:30Temperature = 60˚CTime = 20 min
SOAPING RECIPE:Detergent = 2gm / lM:L = 1:30Temperature = 60˚CTime = 15 min
NEUTRALIZATION:Rinsing with 1ml/l acetic acid at 60°C temperature for 10 min. Then wash the fabric with cold water
44
OXIDATION AND AFTER TREATMENT CURVE
55
66
COLOR FASTNESS TO WASHShade Fabric type Oxidation with Color fastness to Washing
Color changing Color staining
2%, blue Knit
H2O2 4 4-5
Na-Perborate 3-4 4-5Air 4 4-5K2Cr2O7 3 4-5
2%, blue Woven
H2O2 4 4-5Na-Perborate 3-4 4-5Air 4 4-5K2Cr2O7 3-4 4-5
2%, yellow Knit
H2O2 4-5 4-5Na-Perborate 4 4-5Air 4-5 4-5K2Cr2O7 3-4 4-5
2%, yellow Woven
H2O2 4-5 4-5Na-Perborate 3-4 4-5Air 4 4-5K2Cr2O7 3-4 4-5
77
RESULT ANALYSIS OF COLOR FASTNESS TO WASH
88
COLOR FASTNESS TO WATER
99
Shade Fabric type Oxidation with Color fastness to waterColor changing Color staining
2%, blue Knit
H2O2 4 4-5Na-Perborate 3-4 4-5Air 4 4-5K2Cr2O7 3-4 4-5
2%, blue Woven
H2O2 4 4-5
Na-Perborate 3-4 4-5Air 4 4-5K2Cr2O7 3-4 4-5
2%, yellow Knit
H2O2 4-5 4-5Na-Perborate 4 4-5Air 4 4-5K2Cr2O7 3-4 4-5
2%, yellow Woven
H2O2 4-5 4-5Na-Perborate 3-4 4-5Air 4-5 4-5K2Cr2O7 3-4 4-5
RESULT ANALYSIS OF COLOR FASTNESS TO WATER
1010
COLOR FASTNESS TO RUBBING
1111
Shade Fabric type Oxidation withColor fastness to Rubbing
Dry rubbing Wet rubbing
2%, blue Knit
H2O2 4-5 3-4Na-Perborate 4-5 2-3Air 4-5 3K2Cr2O7 4 2
2%, blue Woven
H2O2 4-5 3-4Na-Perborate 4-5 2-3Air 4-5 3K2Cr2O7 4 2
2%, yellow Knit
H2O2 4-5 3-4Na-Perborate 4-5 2-3Air 4-5 3K2Cr2O7 4 2
2%, yellow Woven
H2O2 4-5 3-4Na-Perborate 4-5 2-3Air 4-5 3K2Cr2O7 4 2
RESULT ANALYSIS OF COLOR FASTNESS TO RUBBING
1212
COLOR FASTNESS TO LIGHT
1313
Shade Fabric type Oxidation with Color fastness to lightColor changing
2%, blue Knit
H2O2 4Na-Perborate 4Air 4K2Cr2O7 4
2%, blue Woven
H2O2 4Na-Perborate 4Air 4K2Cr2O7 4
2%, yellow Knit
H2O2 4Na-Perborate 4Air 4K2Cr2O7 4
2%, yellow Woven
H2O2 4Na-Perborate 4Air 4K2Cr2O7 4
RESULT ANALYSIS OF COLOR FASTNESS TO LIGHT
1414
1515
COST ANALYSIS
1616
Chemicals used in oxidation Current Market Price (Tk) / per Kg
Air Free at environment
H2O226
Na-perborate 2500
K2Cr2O75000
Chemicals used in oxidation Cost in our processing (Tk)for each 10gm sample
Cost of processing (Tk)
of 1Kg fabric
Air 0 02 g/l H2O2 (0.6x26)/1000 = 0.0156 1.562g/l Na-perborate (0.6x2500)/1000 = 1.5 1502g/l K2Cr2O7 (0.6x5000)/1000 = 3 300
COST OF OXIDATION OF 1 KG FABRICCOST OF OXIDATION OF 1 KG FABRIC
1717
DECISIONDECISION
1818
COLOR FASTNESS
1919
COST ANALYSIS
2020
SHADE ANALYSIS
2121
RISK FACTOR ANALYSISRISK FACTOR ANALYSIS
2222
OXIDATION PRACTICE IN INDUSTRIES
Air oxidation as most economicAir oxidation as most economic Then treatment with fixer to make a surface coating to improve rubbing Then treatment with fixer to make a surface coating to improve rubbing
fastnessfastness Earlier fixer was formaldehyde or melamine based resin but it’s now Earlier fixer was formaldehyde or melamine based resin but it’s now
banned according to REACH protocolbanned according to REACH protocol Now a days formaldehyde free resin like silicon based or polyamide based Now a days formaldehyde free resin like silicon based or polyamide based
fixer are usedfixer are used
2323
2424
2525
THANK YOUTHANK YOU
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