Sodium Silicate Water Glass (Na2SiO3) as a Hydrogen Peroxide (H2O2 50%) Stabilizer in Cotton Textile & Pulp Bleaching

Table of contents

In alkaline peroxide pre-treatment and bleaching of cotton fabrics (Cotton, CVC, TC) and paper pulp using Hydrogen Peroxide H₂O₂ 50%, controlling peroxide decomposition kinetics at 90–98 °C determines both optical whiteness (CIE Whiteness) and fiber tensile integrity. Liquid Sodium Silicate Na₂SiO₃ (38–42 °Be Water Glass) dosed at 2.0 – 5.0 g/L forms colloidal Magnesium–Silicate micelles that encapsulate trace metal catalysts (Fe²⁺, Cu²⁺, Mn²⁺), preventing free-radical pinhole damage (•OH) and reducing H₂O₂ 50% consumption by 20–30%.

Actual 35kg jerrycan of Solvay Hydrogen Peroxide H2O2 50% at Loc Thien Chemical warehouse

1. Perhydroxyl Activation (`HO₂⁻`) vs Catalytic Free-Radical Pinhole Damage (`•OH`)

To oxidize conjugated chromophores in raw cotton, H₂O₂ is activated with Caustic Soda NaOH at pH 10.5 – 11.2 and 90 – 98 °C to generate the selective Perhydroxyl anion (HO₂⁻):

Bleaching Activation Equilibrium: H₂O₂ + OH⁻ ⇌ HO₂⁻ (active bleaching species) + H₂O (pKa = 11.62 at 25 °C)

If trace transition metals (0.5–2.0 ppm Fe²⁺/Fe³⁺, Cu²⁺, Mn²⁺) from rust or raw cotton are unsequestered, they trigger Fenton / Haber–Weiss radical cascades:

H₂O₂ + Fe²⁺ → Fe³⁺ + OH⁻ + •OH (indiscriminate Hydroxyl radical, E° = +2.80 V)
2H₂O₂ → 2H₂O + O₂↑ (wasteful oxygen evolution)

The •OH radical cleaves β-(1→4)-glycosidic cellulose bonds into brittle Oxycellulose, creating localized pinholes and 25–40% tensile strength loss.

2. Triple Stabilization Mechanism of Sodium Silicate (`Na₂SiO₃`) & Technical Specifications

Colloidal Magnesium Silicate (MgSiO₃) Encapsulation of Metal Catalysts: In water with 2–5 °dH hardness (or supplemented with 0.2–0.5 g/L MgSO₄·7H₂O), polysilicate anions react with Mg²⁺ to form colloidal MgSiO₃·xH₂O micelles that adsorb and passivate Fe(OH)₃ and Cu(OH)₂ particles.
Alkaline pH Buffering (pH 10.5–11.2): Maintains steady HO₂⁻ generation throughout the bleaching cycle while lowering free NaOH requirement (yielding softer fabric hand).
Anti-Redeposition & Equipment Corrosion Inhibition: Suspends saponified cotton waxes and protects stainless steel vessels.

Table 1: Technical Specifications of Liquid Sodium Silicate (`Na₂SiO₃`) for Textile & Pulp Bleaching

Quality Parameter	Unit	Standard Textile & Pulp Grade (`38–40 °Be`)	High-Solids Industrial Grade (`42–45 °Be`)	Process Function in `H₂O₂` Bleaching
Silicon Dioxide (`SiO₂`)	`% w/w`	`26.0% – 28.5%`	`28.5% – 31.0%`	Forms colloidal `MgSiO₃` stabilizer network.
Sodium Oxide (`Na₂O`)	`% w/w`	`8.5% – 9.8%`	`9.5% – 11.0%`	Buffers alkalinity and keeps silica soluble.
Silicate Modulus (`M = SiO₂ / Na₂O`)	Molar Ratio	`2.8 – 3.2`	`2.4 – 2.8`	`M = 2.8–3.2` maximizes peroxide stabilization.
Baume Degree at `20 °C`	`°Be`	`38.0 – 40.0 °Be`	`42.0 – 45.0 °Be`	Specific gravity `d = 1.36 – 1.39 g/cm³`.
Trace Iron (`Fe`) Content	`ppm`	≤ 50 – 100	≤ 100	Prevents introducing exogenous iron into the bath.

3. Standard Cotton Bleaching Formulations & Silica Scale Prevention

Table 2: Industrial Formulation Matrix for Cotton Bleaching with H₂O₂ 50% + Na₂SiO₃ + NaOH

Chemical & Process Parameter	1. Exhaust Jet / Overflow Machine (Liquor Ratio `1:8 – 1:10`)	2. Continuous Pad-Steam (Wet Pick-up `85%–95%`)	3. Cold Pad-Batch (CPB) (Dwell at `25–30 °C` for `18–24 h`)
Hydrogen Peroxide `H₂O₂ 50%`	`3.0 – 6.0 g/L`	`25 – 45 g/L`	`35 – 55 g/L`
Sodium Silicate `Na₂SiO₃ (38–40 °Be)`	`2.0 – 3.5 g/L`	`8.0 – 15.0 g/L`	`12.0 – 20.0 g/L`
Caustic Soda `NaOH 100%` (or `NaOH 32%` eq.)	`1.5 – 2.5 g/L` (`4.7–7.8 g/L NaOH 32%`)	`8.0 – 14.0 g/L`	`12.0 – 18.0 g/L`
Magnesium Sulfate (`MgSO₄·7H₂O`) (if `0 °dH` water)	`0.2 – 0.3 g/L`	`0.5 – 1.0 g/L`	`0.8 – 1.2 g/L`
Non-ionic Wetting / Scouring Agent	`1.0 – 1.5 g/L`	`3.0 – 5.0 g/L`	`4.0 – 6.0 g/L`
Temperature & Reaction Time	`95 – 98 °C` × `45 – 60 min`	`100 – 102 °C` × `20 – 30 min`	`25 – 30 °C` × `18 – 24 hours`
Target Residual `H₂O₂` at End of Cycle	`10% – 15%` of initial dose	`15% – 20%` of initial dose	`20% – 25%` of initial dose

Preventing Silica Scale (SiO₂·nH₂O): Maintain end-of-bleach pH ≥ 10.2 and always execute the first post-bleach rinse with boiling hot water (85–90 °C) before introducing cold water.

3-tier IBC rack storage at Loc Thien Chemical warehouse

4. Supply of Sodium Silicate Na₂SiO₃ & ZDHC MRSL v3.1 Certified H₂O₂ 50% / NaOH by Loc Thien Chemical

Loc Thien Investment Development Co., Ltd. (LOC THIEN INVESTMENT DEVELOPMENT COMPANY LIMITED — Tax ID: 0313650856) is a specialized commercial supplier and distributor of industrial chemicals across Vietnam:

Synchronized Textile Bleaching Package:
- Liquid Sodium Silicate (Na₂SiO₃ 38–42 °Be, M = 2.8–3.2): Crystal-clear filtered solution in 35 kg cans, 300 kg drums, 1,000 L IBCs, and 5–30-ton tankers.
- ZDHC MRSL Version 3.1 Conformance Level 1 Certified H₂O₂ & NaOH: Both H₂O₂ (Cert No. ZDHC1 127736 0002 Rev. 00, Report No. 2486017673-Q24VPS-CHM2869) and NaOH (Cert No. ZDHC1 127736 0001 Rev. 00, Report No. 2486017672-Q24VPS-CHM2869) hold official CERTIFICATE (ZDHC MRSL Conformance Level 1) issued by TÜV SÜD Product Service GmbH / TÜV SÜD Vietnam.
6 Strategic Warehouses (3,000+ tons/month) & Delivery SLA: Ba Ria - Vung Tau (Phu My 1 IP), Dong Nai (Long Thanh IP), Binh Duong (Di An City), Da Nang (Hoa Khanh IP), Can Tho (Tra Noc IP), and Bac Ninh (Tien Son IP). Headquarters: 452/6B Tinh Lo 10, Binh Tri Dong Ward, Binh Tan District, Ho Chi Minh City. Technical quotation within 15 minutes; delivery within 4 hours in inner HCMC, 24–48 hours across Southern & Mekong Delta industrial zones, and 2–3 days in Northern & Central Vietnam. Contact hotline 0979 891 929 for detailed delivery procedures.

Product Pages: Liquid Sodium Silicate Na₂SiO₃ | Hydrogen Peroxide H₂O₂ 50% | Liquid Caustic Soda NaOH 32%–50%
GHS Safety Data Sheets (MSDS): MSDS Sodium Silicate Na₂SiO₃ | MSDS Hydrogen Peroxide H₂O₂
Related Engineering Guide: CO₂ Sand Casting & Acid-Resistant Mortar Using Sodium Silicate Na₂SiO₃
Technical Inquiry & 15-Minute Quotation: Hotline 0979 891 929 (tel:0979891929) — Email: [email protected].

Sodium Silicate Water Glass (Na2SiO3) as a Hydrogen Peroxide (H2O2 50%) Stabilizer in Cotton Textile & Pulp Bleaching

1. Perhydroxyl Activation (HO₂⁻) vs Catalytic Free-Radical Pinhole Damage (•OH)

2. Triple Stabilization Mechanism of Sodium Silicate (Na₂SiO₃) & Technical Specifications

Table 1: Technical Specifications of Liquid Sodium Silicate (Na₂SiO₃) for Textile & Pulp Bleaching