PDADMAC Cationic Polyelectrolyte for Paper Wet End Retention and Drainage

Product Overview

Bluwat PDADMAC Cationic Polyelectrolyte is a liquid Poly(dimethyldiallylammonium chloride) polymer, also known as PolyDADMAC, PDADMAC, Polydadmac or PolyDMDAAC. It is a high charge density cationic polymer designed for water treatment, wastewater treatment, paper making and industrial process applications.

In the paper wet end, pulp slurry usually contains fibers, fines, fillers, dissolved anionic substances and process chemicals. If the wet end charge is not well controlled, paper mills may face poor retention, high white water turbidity, slow drainage, foam problems, unstable sizing performance and higher chemical consumption.

PDADMAC provides strong cationic charge neutralization. It helps neutralize anionic trash and improve the fixation of fines, fillers and other negatively charged particles onto fibers. When used properly in the wet end system, it can support better retention, cleaner white water, improved drainage and more stable paper machine performance.

This product is suitable for paper mills that require wet end charge control, retention improvement, drainage support and process water clarification.

Application in Paper Wet End

PDADMAC is used in the wet end of the paper machine to improve the interaction between fibers, fines, fillers and dissolved charged substances. It helps control the charge balance of the system and improves retention efficiency.

It can be applied in:

• Paper wet end charge control
• Fines and filler retention support
• Drainage improvement
• White water clarification
• Anionic trash neutralization
• Process water recycling
• Paper machine runnability improvement
• Sludge dewatering support
• Paper mill wastewater pretreatment

Why Paper Mills Use PDADMAC

Paper wet end systems are chemically complex. Recycled fiber, broke, coating color return, fillers, sizing agents, dyes, starch, surfactants and other additives may bring anionic contaminants into the system. These substances can reduce retention performance and disturb the stability of paper machine operation.

PDADMAC has high cationic charge density. After dosing into the wet end system, it can neutralize anionic substances and help fix fine particles onto fibers. This supports better retention and reduces the amount of fines and fillers lost into white water.

Better retention and drainage can help paper mills reduce fiber and filler loss, improve water loop cleanliness and support more stable production.

Main Functions

Wet End Charge Control

PDADMAC helps neutralize anionic trash and balance the wet end charge. This can make other papermaking chemicals work more effectively and reduce process fluctuation.

Fines and Filler Retention

By improving charge interaction, PDADMAC helps fines and fillers attach more easily to fibers. This supports better retention and reduces solid loss in white water.

Drainage Improvement

When fines and colloidal particles are better controlled, water can drain more efficiently through the forming section. This can support improved drainage performance and paper machine runnability.

White Water Clarification

PDADMAC can help reduce suspended solids and turbidity in white water, supporting cleaner water circulation and lower load on save-all or wastewater treatment systems.

Sludge Dewatering Support

As a cationic polymer, PDADMAC can also support sludge conditioning and dewatering in paper mill wastewater treatment systems.

Key Benefits

• High cationic charge density for effective charge neutralization
• Suitable for paper wet end retention and drainage support
• Helps improve fines and filler retention
• Supports wet end charge balance and chemical stability
• Can reduce white water turbidity and suspended solids
• Liquid form for easy dilution, dosing and continuous operation
• Good water solubility and fast dispersion
• Can be used alone or with other papermaking chemicals
• Supports paper machine runnability and process water recycling
• Available in different solid content and viscosity grades
• Suitable for paper making, process water and wastewater treatment
• Manufacturer supply with TDS, MSDS, COA and sample support

Technical Specifications

Typical Liquid Grades

Recommended Use in Paper Wet End

The best dosage and dosing point should be confirmed by laboratory test and paper machine trial because paper furnish, filler type, recycled fiber ratio, pH, conductivity and wet end chemistry may vary between mills.

A typical wet end evaluation process may include:

1. Check pulp furnish, pH, conductivity and wet end charge condition
2. Dilute PDADMAC before dosing
3. Add PDADMAC into the suitable wet end dosing point
4. Mix evenly with pulp slurry for charge neutralization
5. Evaluate fines retention, filler retention and drainage performance
6. Adjust dosage according to white water turbidity and machine runnability
7. Combine with retention aid or drainage aid if needed
8. Confirm performance through paper machine trial

Suggested Dosing Points

PDADMAC can be tested in different positions depending on the paper machine system:

• Machine chest
• Blend chest
• Fan pump inlet
• Short circulation system
• Before retention aid dosing point
• White water treatment system
• Sludge conditioning system

The dosing point should be selected according to mixing condition, retention target, charge balance and paper machine layout.

Use with Other Papermaking Chemicals

PDADMAC can work together with other wet end chemicals when properly selected and tested.

It can support:

• Cationic or anionic PAM retention systems
• Microparticle retention systems
• PAC or inorganic coagulants in water treatment
• Starch and sizing chemical performance
• White water clarification programs
• Sludge dewatering chemical programs

The compatibility and sequence should be confirmed by testing to avoid overdosing or charge reversal.

Dilution and Dosage

When used alone for water treatment, PDADMAC is recommended to be diluted to 0.5–5% concentration based on solid content before dosing.

For paper wet end application, dilution and dosage should be adjusted according to paper furnish and treatment target. Overdosing should be avoided because excessive cationic charge may affect wet end balance or disturb other additives.

The most economical dosage should be confirmed through jar test, dynamic drainage test, retention test and paper machine trial.

Suitable Paper Grades

• Packaging paper
• Corrugated medium
• Kraft paper
• Writing and printing paper
• Tissue paper
• Board paper
• Recycled paper
• Specialty paper
• Paper mill process water and wastewater systems

Packaging

• 25L plastic drum
• 200L plastic drum
• 1000L IBC drum
• Customized packaging can be discussed according to order quantity and shipment requirements.

Storage

Store in original containers in a cool and dry place. Keep away from heat, flame and direct sunlight. Keep containers tightly closed when not in use. Please refer to the product label, Technical Data Sheet and MSDS for detailed handling, storage and shelf life information.

Why Choose Bluwat

Bluwat supplies PDADMAC, PolyDADMAC, PAM, PAC, Polyamine and other water treatment and papermaking process chemicals for paper mills and industrial wastewater treatment plants.

For paper wet end retention and drainage applications, Bluwat can provide product grade selection, sample support, laboratory testing guidance and technical documents including TDS, MSDS and COA. Different PDADMAC grades are available to match different wet end charge conditions, paper furnish systems and process water treatment requirements.