Textile Chemistry Published by ZEELCHEM™ Technical R&D

Water Treatment Strategies for Textile Wet Processing: Scouring, Bleaching & Dyeing

Key Summary: Textile processing consumes up to 100–150 liters of water per kilogram of fabric. Trace calcium, magnesium, iron, and manganese ions cause dye precipitation, unlevel shade dyeing, and catalytic decomposition of hydrogen peroxide bleach baths. Specialized organophosphonates and polycarboxylates prevent these defects while silicone defoamers eliminate high-temperature jet foam.

1. Hardness Ion Chelation & Scouring Aids

During cotton scouring and washing, calcium and magnesium form insoluble lime soaps with fatty acids, leaving harsh residues on yarn. Polyacrylic Acid (ZEELCHEM™ 1000) and MA/AA Copolymer (ZEELCHEM™ 3000) disperse soap scum and complex polyvalent cations without stripping reactive dye chromophores.

2. Hydrogen Peroxide (H₂O₂) Bleach Bath Stabilization

Trace iron (Fe²⁺/Fe³⁺) and copper (Cu²⁺) catalyze rapid, uncontrolled decomposition of hydrogen peroxide into oxygen bubbles, causing pinhole fiber damage and uneven whiteness. HEDP 60% (ZEELCHEM™ 101) and DTPMP 50% (ZEELCHEM™ 131) sequester catalytic heavy metal ions, stabilizing alkaline peroxide baths up to 98°C.

3. High-Temperature Jet Dyeing Defoaming

Modern high-speed jet dyeing machines generate intense turbulence. ZEELCHEM™ DF Silicone Defoamer Emulsion suppresses foam without coagulating onto synthetic fabric fibers under 130°C pressure dyeing.

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