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Anionic polyacrylamide (APAM) is widely used in papermaking, mainly for retention aid, drainage aid, strength improvement, white water recovery and sludge dewatering, suitable for neutral/alkaline systems.
1. Core Functions
- Retention Aid: Increases retention rate by 20–30%, saves 20–30kg pulp per ton, reduces white water turbidity.
- Drainage Aid: Accelerates dewatering by over 30%, increases machine speed and reduces drying energy consumption.
- Dry Strength Agent: Improves tensile, burst and tear strength by 10–20%, enhances printability.
- Formation Improver: Optimizes fiber dispersion and paper smoothness.
2. Surface Sizing & Specialty Paper
Compound with starch as surface sizing agent for newsprint/coated paper; applied in food/tea packaging paper to meet hygiene and strength requirements.
3. White Water & Wastewater Treatment
Medium-molecular-weight APAM (6–8 million) recovers over 90% fine fibers from white water; combined with PAC for sludge dewatering.
4. Key Parameters
- pH: 6.5–9.0 (neutral to alkaline)
- Molecular weight: 8–12 million (retention/drainage); 3–6 million (strength/sizing)
- Dosage: 0.05–0.2% (based on oven-dry pulp); 2–5mg/L (wastewater, with PAC)
5. Notes & Difference
Avoid mixing with cationic additives; control dissolving temperature (≤60℃) and stirring speed (≤200rpm). Unlike cationic PAM (for acidic/neutral systems, COD removal), APAM is for neutral/alkaline systems, focusing on retention, drainage and strength.
