Vat blue 66

Deep brilliant navy vat dye optimized for cotton and cellulosic substrates — suitable for vat dyeing, pad-steam and continuous processes.

Product overview

Vat Blue 66 is an industrial vat dye used primarily for dyeing cotton and regenerated cellulosics. It yields deep, brilliant navy shades with strong wash and light fastness when processed via recommended vat reduction/oxidation recipes and good process control.

Recommended vat reduction recipe — bench / mill starting guidance

Safety first: vat reduction uses caustic and reducing agents — conduct bench trials, use proper PPE and consult SDS. Below are indicative starting points for trialing:

1. Liquor ratio (LR): 1:8 — 1:20 depending on process (exhaust vs pad-steam).
2. Alkali (NaOH): typical starting range 10–25 g/L (adjust per lab results).
3. Reducing agent: sodium dithionite (hydrosulfite) commonly 10–30 g/L to reduce dye to leuco form.
4. Temperature: 20–50°C depending on recipe; pad-steam schedules differ — follow mill practice.
5. After dye exhaustion, oxidize thoroughly (air oxidation or controlled H₂O₂ wash), then neutralize and rinse.

Notes: For pad-steam, prepare fine micronized dispersions and control pickup; for rope/jet dyeing adjust time & alkali/reducing levels. Always record pH, redox and temperature during trials.

Fastness & performance

Supplier TDS entries commonly report high light and wash fastness for Vat Blue 66 (examples: light fastness 7–8, wash fastness fading 4–5 on cotton in some TDS). Verify exact values on your supplier TDS/COA. :contentReference[oaicite:8]{index=8}

Technical Specifications

• ‍Product Name: Vat Blue 66
• C.I. No.:Vat Blue 66
• CAS No.:432220-82-9
• Molecular Formula:C41H27N7O6
• Molecular Weight: 713.69638
• Relative Name: 1,1'-[(6-phenyl-1,3,5-triazine-2,4-diyl)diimino]bis[3-acetyl-4-aminoanthraquinone];9,10-Anthracenedione,1,1'-[(6-phenyl-1,3,5-triazine-2,4-diyl)diimino]bis[3-acetyl-4-amino-;1,1'-[(6-Phenyl-1,3,5-triazine-2,4-diyl)bisChemicalbookimino]bis(3-acetyl-4-aminoanthracene-9,10-dione);1,1'-[(6-Phenyl-1,3,5-triazine-2,4-diyl)diimino]bis[3-acetyl-4-amino-9,10-anthracenedione];-[(6-phenyl-1,3,5-triazine-2,4-diyl)diimino]bis[3-acetyl-4-aminoanthraquinone]‍

Environmental & wastewater notes

Vat dyeing effluent can contain reducing agents and caustic. Implement appropriate wastewater treatment to oxidize residual leuco species and remove sulfites/bisulfites/reducing residues in line with local regulations.