SUBJ-13:
Discharge Printing on direct dyed fabric with Potassium permanganate(KMnO4).
Chemicals:
Potassium permanganate (Oxidizing agent), Sodium bisulfite (Reducing agent), Acetic Acid (Conc), Special Thickener (inorganic compound based on silicate), Soap (Polyglycolether, Nonionic).
Process:
Purpose is to discharge all direct dyed substrate through Oxidation reaction of Potassium permanganate in acidic pH and than Reduction through Sodium Bisulfite again in acid pH. than finally soaping.
Recipe:
Stock paste:
Special Thickerner 35g/Kg
Potassium permanganate 40g/Kg
Acetic Acid 10g/Kg
Water Balance
Total 1 Kg
Processing Steps Involved:
¯ Print and Dry at 100-120C.
¯ Washing off in a reduction for fifteen minutes at 70C, bath containing
1. Sodium Bisulfite 10g/L
2. Acetic Acid 0.5g/L
Wash for 10Min at 70C with Soap (Polyglycolether, Nonionic).
¯ Rinse Warm and Cold.
Remarks by:
Direct dyes have been used for quite long time for dyeing cellulosic fabric. These dyed fabric can be easily discharged through Sodium formaldehyde sulfoxylate (commonly called Rangolit C) or this can also be done through Potassium permanganate, Results are quite fine. Whole process is in front of you.
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after discharging the direct dyes which dyes can be applyed in presence of oxidising agent kmno4
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