FC-12.2-M
Oxygen Bleach Liquid
Ingredients
| Ingredient | Function | % w/w |
|---|---|---|
| Hydrogen peroxide (35% H₂O₂) | Active bleaching agent | 10.0–14.3 |
| Dequest 2010 (HEDP, 60%) | Metal ion chelator | 0.10–0.20 |
| Butylated hydroxytoluene (BHT) | Free radical scavenger | 0.01–0.03 |
| C₁₂–C₁₅ alcohol ethoxylate (AE7) | Wetting agent | 3.0–5.0 |
| Phosphoric acid (85%) | pH buffer | 0.05–0.15 |
| Deionized water | Diluent | qs to 100.0 |
| Final specifications: H₂O₂ = 3.5–5.0%; pH = 3.0–5.0 |
Formulation Notes
Liquid oxygen bleach uses hydrogen peroxide (H₂O₂, CAS 7722-84-1) as a color-safe oxidant. Formulated at acidic pH for storage stability, the active perhydroxyl anion (HOO⁻) generates only upon dilution into alkaline wash liquor.
Formulation Card FC-12.2-M: Oxygen Bleach Liquid
Hydrogen peroxide has pKₐ = 11.6; at formulation pH 3–5 it exists as stable undissociated HOOH . Dilution into wash liquor at pH 9–11 generates HOO⁻, the active bleaching species. Storage stability requires a dual-component system: amino polyphosphonates such as HEDP chelate dissolved metal cations (Fe³⁺, Cu²⁺, Mn²⁺), while hindered phenols such as BHT scavenge free radicals. Accelerated aging at 37.8 °C for 8 weeks showed formulations with HEDP (0.12%) + BHT (0.01%) retained >95% of initial H₂O₂ versus <78% for unstabilized controls . Nonionic alcohol ethoxylates provide wetting and mild detergency. Performance on heavily stained whites is inferior to chlorine bleach, but the product is safe for all colorfast fabrics at 25–50 mL per 4.5 kg load at 40–60 °C.