Cationic Paper Making Retention Additive

During the papermaking process, fines, fillers (such as calcium carbonate, talc, and silica), and sizing agents are prone to loss via white water. This not only compromises paper quality and production efficiency but also increases the burden of white water treatment and leads to raw material waste. The cationic paper-making retention additive features a high density of strong cationic quaternary ammonium groups, enabling it to bind with negatively charged cellulose fibers, fillers, and anionic impurities through electrostatic attraction. By utilizing multiple mechanisms—including charge neutralization, adsorption bridging, and film formation—it firmly retains fines and fillers within the paper sheet while significantly improving pulp drainage performance.

Key Characteristics

• Strong cationic polyelectrolyte with high charge density

• Low dosage and high efficiency; typical dosage range: 0.01%--0.05% (based on absolutely dry pulp)

• Wide pH tolerance range (4--10), suitable for acidic, neutral, and alkaline papermaking systems

• High shear resistance, suitable for high-speed paper machine operation

• Liquid form, easily soluble in water, and convenient to use

• Safe and non-toxic, compliant with standards for paper intended for food contact

What are the distinctive advantages?

Advantage 1: Significantly improves retention and substantially reduces raw material waste

In the wet end of the papermaking process, if fine fibers and fillers cannot be effectively retained in the paper sheet, it not only results in significant loss of raw materials but also increases the load on the white water recirculation system and wastewater treatment costs.

Through the strong cationic quaternary ammonium groups on its molecular chains, this product forms strong electrostatic adsorption with the negatively charged surfaces of cellulose fibers and fillers, "anchoring" fine particles to the fiber network. Research data indicates that at a dosage of just 0.10%, the single-pass retention rate of the pulp can be increased from 71.0% to 79.7%. Reports from paper mills worldwide show that using PolyDADMAC can increase first-pass retention by 12%--18%.

Advantage 2: Significantly Improves Water Drainage Performance and Enhances Paper Machine Operating Efficiency

The water drainage performance of pulp directly affects the paper machine's running speed, energy consumption in the drying section, and the efficiency of the entire production line. Slow water drainage means the drying section requires more steam, the paper machine's running speed is limited, and production capacity cannot be fully realized.

Through charge neutralization and bridging flocculation, Cationic Paper Making Retention Additive causes fine fibers and fillers to aggregate into larger flocs, which settle more quickly on the wire, reducing the clogging of the wire by fine fibers and thereby accelerating water removal. Research data indicates that, under identical conditions, using 0.1% of this product can reduce drainage time by 22%--28%; the pulp's beating degree can be reduced from 50°SR to 23°SR.

Advantage 3: Efficient Capture of Anionic Waste, Stabilizing the Chemical Environment in the Wet Section

With the increasing use of high-yield pulp and deinked waste pulp, as well as the widespread adoption of closed-loop white water systems, large amounts of anionic waste—such as lignin degradation products, hemicellulose, resin acids, and other soluble and colloidal substances (DCS)—have accumulated in pulp systems. These anionic impurities interfere with the effectiveness of cationic additives, cause precipitation and deposition, and adversely affect paper quality.

As a highly effective anionic waste capture agent (ATC), this product utilizes its high cationic charge density to strongly adsorb and immobilize these anionic impurities, preventing them from disrupting the wet-end chemical system in papermaking. Research has confirmed that PDADMAC possesses exceptional capture capacity for DCS; at a dosage of 0.1%, it can reduce filtrate turbidity by 58.9%.

Advantage 4: Enhances Paper Strength and Quality; Multi-Purpose Application Reduces Costs and Improves Efficiency

This product not only aids in retention and filtration but also significantly improves the physical properties of paper.

Through electrostatic adsorption, it creates tighter contact between fibers and enhances their bonding strength, thereby increasing the paper's dry and wet strength. At the same time, it neutralizes anionic impurities in the pulp, reduces electrostatic repulsion, and results in a denser paper structure. Research has confirmed that paper produced using this product exhibits increased tensile strength and tear resistance. This product also improves the adsorption of wet-strength agents (such as PAE), ensuring their uniform distribution throughout the paper structure.

Cationic paper-making retention additives are typically used in combination with other additives to form a more efficient wet-end chemical system:

Selecting a wet-end chemical solution that complements the Cationic Paper Making Retention Additive = systemic benefits where 1+1>2.

Why Is It So Effective?

The mechanism of action of the Cationic Paper Making Retention Additive is clear and well-defined, involving the synergistic interaction of multiple mechanisms:

First Layer: Charge Neutralization

Pulp fibers, fillers, and anionic impurities carry a negative charge on their surfaces. The quaternary ammonium cationic groups on the product's molecular chains neutralize these surface negative charges through electrostatic attraction, thereby reducing the electrostatic repulsion between particles.

Second Layer: Adsorption and Bridging

Polymer molecular chains use multiple adsorption sites to "bridge" fine fibers, fillers, and other microparticles to larger fibers, forming larger, more stable flocs. These flocs resist the shear forces encountered during papermaking, ensuring that more fillers and fine fibers remain in the paper.

Third Layer: Film Formation and Fixation

The adsorbed polymer forms a uniform protective film on the fiber surface, fixing fine particles to the fibers and preventing them from detaching during subsequent processes.

Fourth Layer: Anionic Contaminant Control

Its high positive charge density enables it to strongly adsorb and immobilize soluble and colloidal anionic substances (DCS), preventing them from interfering with the wet-end chemical system.

One product, four mechanisms—from charge neutralization to bridging flocculation, and from film formation and fixation to anionic contaminant control—comprehensively optimizing wet-end performance in papermaking.

Flexible Packaging · Safe Storage and Transportation

• Packaging Specifications: PE plastic drums / IBC containers

• Storage Conditions: Store in a sealed container in a cool, dry, and well-ventilated area

• Shelf Life: 12 months

• Transportation: Safe, non-toxic, and non-flammable; may be transported as non-hazardous goods