08
2025
-
09
Can gray velvet be treated with a flame-retardant finish? Will such treatment cause it to yellow?
Replace disperse/black or vat/grey dyeing with a cold-reactive dyeing mixture: Reactive Black RGB + Reactive Neutral Grey H-EX.
Can flame-retardant performance be achieved in blended suede-like velour without causing the gray tone to “burn and turn yellow”?
Yes—provided you follow the three-step protocol for laboratory/factory validation in 2024–25; it will maintain ΔE < 0.5 and comply with GB 8965.1 B1 (LOI ≥ 30%).
-
Dye Selection
Replace disperse dyes/black or vapor dyeing dyes/grey with cold-reactive mixed dyes: Reactive Black RGB + Reactive Neutral Grey H-EX.
Neither of these dyes contains amino groups that can react with phosphorus-based resins; consequently, color difference drift is ≤0.4 ΔE (compared with 3.6 ΔE for conventional steam-dyed gray). -
Flame-retardant bath liquid
P-N synergist: 180 g/L of 25% THPS, 6% melamine resin, and 1 g/L of anti-yellowing agent HT-46 (hydroxyphenyl triazole), at pH 6.5.
Cure at 170°C for 90 seconds, with a出炉 temperature of ≤60°C. This can reduce “ammonia burn”–induced yellowing by 50%. -
Washing and整理 afterwards
Cold water rinse → 50°C neutral soap solution (1 g/L) → Reductive cleaning at 0.3 g/L, 60°C for 10 minutes → Soft setting.
This step removes residual acidic substances; the gray level increases from 3–3.5 to 4.5—resulting in almost no visible “burnt yellow” discoloration.
Cost increases by approximately US$0.40 per yard; applicable to rail seating, hotel curtains, and other flame-retardant blended velour projects.
Related information
Address
5th Floor, Hangzhou Tangchi Plastic Film Technology, No. 6 Yuanliu Road, Shanbei Village, Guali Town, Xiaoshan District, Hangzhou, Zhejiang Province, China