AKD Sizing Agent (Alkyl Ketene Dimer)
Alkyl ketene dimer (AKD) is a widely used neutral and alkaline internal sizing agent for paper and board production. It forms a covalent ester bond with cellulose hydroxyl groups, providing excellent long-term hydrophobicity and ink holdout. AKD is typically supplied as a stable wax emulsion for easy addition to the wet end.
Technical Specifications
| pH | 3.5–5.0 |
| appearance | White milky emulsion |
| active content (%) | 15±2 |
| viscosity (mPa·s) | < 100 |
| particle size (μm) | < 1.0 |
Applications
- Internal sizing of fine writing and printing paper
- Alkaline papermaking for improved permanence
- Packaging board and containerboard sizing
- Coated base paper surface sizing
- Specialty paper and label stock sizing
Key Features
- Covalent ester bonding ensures durable water resistance
- Optimized for alkaline papermaking (pH 7–9)
- Stable emulsion with extended shelf life
- Low Cobb value achievement at minimal dosage
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