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FEDA-SH Sarex
Soda ash substitute in Cold Pad Batch dyeing
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Benefits of Cold Pad Batch (CPB)
Relatively low cost of equipment Less surface area Low amount of effluent No salt residue in effluent water (Conventional exhaust dyeing system emits up to 1 kg salt per kg of fabric) Low steam consumption (Approx. 50 % less) Low electricity requirement (30 - 40 % less) Improved fabric quality Reduced labor cost
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Need of Sodium silicate
Sodium silicate solution is used in CPB dyeing to produce a high pH in
order to fix reactive dye on cotton or silk Purpose of the Sodium silicate is to raise the pH to approximately 11.0 Disadvantages of Sodium silicate Sensitive to water hardness
Handle impairment Reduction in absorbency Blocking of pipes Not suitable in the process house which are using RO plant for effluent treatment The most commonly used chemical to make highly alkaline pH is Soda ash Soda ash comes with drawbacks of high TDS, BOD and COD
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FEDA-SH - INTRODUCTION
Feda-SH is a highly effective soda ash substitute It is used for fixation of all type of reactive dyes on cellulosics.
It decreases the reactive dye hydrolysis and hence increases the degree of dyeing It is a highly effective soda ash substitute
It shows predominant buffer action and it disperse evenly in dye solution It has high rate of fixation Advantage: Low TDS, BOD and COD
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KEY FEATURES AND BENEFITS
Key Features
Benefits
Reduces reactive dye hydrolysis
Enhanced degree of dyeing
Ecofriendly
Low TDS, COD and BOD value
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CHARACTERISTICS
Physical appearance
White to off white powder with granules
Ionic nature
Nonionic
pH of 1 % solution
13.0 Âą 1
Miscibility
Soluble in water
Compatibility
Compatible with cationic ,anionic and non-ionic products
Stability
Stable to dilute acids and dilute alkalies
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Stepwise procedure for Cold pad batch
1. Pad the fabric at 70% expression 2. Batch for 16hrs 3. Hot wash at 90°C for 20 min. 4. soaping with 2g/l Sarakol-1583 at 95°C for 20 min. 5. Evaluate washing fastness of dyed fabrics as per ISO 105 C10 at 60°C
Concentration: Conventional: Sodium silicate: 35g/l (108 deg T) Sarex Recipe: Feda-SH: 10-20g/l
RESULTS: Sarex
Washing fastness by ISO 105 C10 Dye : Reactive Corazol Red 5B
RESULTS: Sarex
Washing fastness by ISO 105 C10 Dye : Reactive Corazol Black GSN
RESULTS: Sarex
Washing fastness by ISO 105 C10 Dye : Reactive Turquoise Blue H2GP
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Thank You
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