Bentonite Microparticle (Retention & Drainage Aid)
CAS Number: 1302-78-9
Bentonite microparticle is a swelling smectite clay used as the anionic component in dual and multi-component retention and drainage systems for papermaking. When added after a high-molecular-weight cationic polymer, bentonite breaks the polymer-fiber flocs into smaller, more uniformly distributed microflocs, dramatically improving formation, drainage, and filler retention. It is widely used in alkaline fine paper and packaging board production.
Technical Specifications
| appearance | White to grey fine powder or aqueous suspension |
| pH (2% suspension) | 8.5–10.5 |
| swelling index (mL/2g) | ≥ 25 |
| particle size (μm, d90) | < 5 |
| moisture content (powder, %) | ≤ 12 |
Applications
- Anionic microparticle in CPAM/bentonite retention system
- Drainage acceleration in high-speed fine paper production
- Filler retention improvement in alkaline papermaking
- Formation quality enhancement for printing papers
- Packaging board two-component retention system
Key Features
- High swelling capacity provides extensive anionic surface area
- Microfloc formation improves formation and drainage simultaneously
- Lower sensitivity to ionic strength than colloidal silica
- Compatible with all standard cationic retention aids
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