In the modern papermaking process, the demand for efficient and multifunctional chemical additives has never been higher. Among these, PolyDADMAC (polydiallyldimethylammonium chloride) stands out as a high-performance cationic coagulant that plays a critical role across various stages of paper production. Our Azfc® PD40 series of PolyDADMAC is specially developed to meet the rigorous performance requirements of both fine paper and packaging board manufacturers.
Key Functions of PolyDADMAC in Papermaking
- Charge Neutralization and Pitch Control
PolyDADMAC is primarily used as a cationic fixative to neutralize the anionic trash commonly found in pulp suspensions. It effectively interacts with negatively charged impurities, such as wood resin, fines, and filler particles, thereby stabilizing the wet-end chemistry and improving retention. - Improved Retention and Drainage
When used in combination with microparticle retention systems, PolyDADMAC helps form larger and more shear-resistant flocs, significantly improving filler and fines retention while enhancing drainage rates. This results in higher machine speeds and improved runnability. - Enhanced Dry Strength and Formation
By promoting better fiber-fiber bonding and filler distribution, PolyDADMAC can also contribute to a more uniform sheet formation and better surface properties, which are crucial for high-quality printability and converting.
Application Benefits
- Suitable for a wide pH range (typically 4.5–8.5)
- Fast cationic response for quick charge demand control
- Excellent compatibility with other wet-end additives such as dry strength agents, cationic starch, and retention aids
- Stable performance in both virgin and recycled fiber systems
Recommended Use
Azfc® PD40 is typically added to the stock preparation system, usually before or at the fan pump. The exact dosage depends on the system conditions and performance targets, typically ranging from 0.01% to 0.1% based on oven-dry pulp.
