Medium Molecular Weight Nonionic Polyacrylamide

PAMCHEM Medium Molecular Weight Nonionic Polyacrylamide (NPAM) is a synthetic water-soluble linear polymer with a non-ionic functional structure (degree of hydrolysis < 3.0%). Designed for industrial environments where high electrolyte concentrations, fluctuating pH, or multivalent ions cause ionic polymers to coil or precipitate, this grade relies on stable hydrogen-bonding adsorption. It provides controlled solution viscosity, preventing over-bridging while maintaining rapid particle-wetting characteristics in precision processing loops.

Nonionic polyacrylamide functions via multi-point hydrogen bonding and particle adsorption rather than electrostatic attraction.

Charge Neutrality: Polymer chains carry no electrical charge, maintaining performance during sudden fluctuations in total dissolved solids (TDS) or high salinity.

Shear Tolerance: Moderate chain length withstands mechanical turbulence in high-shear transfer lines and centrifugal dosing loops without excessive chain scission.

Acidic & High-Salinity Wastewater: Clarifying industrial effluents containing high concentrations of calcium, magnesium, or monovalent salts where charged polymers fail due to charge-shielding.

Hydrometallurgical Ore Slurries: Liquid-solid separation in acid leach circuits (gold, copper, zinc, and nickel extraction) requiring strict ionic stability.

Coal & Mineral Tailings: Centrifugal dewatering and settling of fine mineral suspensions, clay wash water, and silica slurries.

Paper Manufacturing: Serving as a non-ionic fiber dispersing agent and wet-end retention aid in neutral sizing paper machines.

High Total Dissolved Solids (TDS > 15 g/L): Select medium molecular weight nonionic grades to bypass charge-shielding failure encountered by anionic polymers in saline process water.

Fine Suspended Solids (< 20 μm): Medium chain lengths provide adequate surface contact sites without trapping excess water into flocs.

Variable pH Loops (pH 3 - 9): Performance remains stable across acidic and neutral environments due to the absence of carboxylate groups.

Makeup Water Quality: Use clean dilution water (15°C to 35°C) with hardness below 200 mg/L. Pre-filter iron-rich hard water.

Concentration Parameters: Maintain stock solutions between 0.1% and 0.5% weight/volume. Allow 45 to 60 minutes for complete hydration prior to secondary dilution at the injection point.

Agitation Equipment: Use a mechanical propeller stirrer running at 300 - 400 rpm in a polyethylene (PE) or 304 stainless steel tank. Avoid high-shear centrifugal pumps during makeup.

Polymerization Method: Aqueous solution polymerization using high-purity acrylamide monomer with thermal initiation control.

Drying & Classification: Continuous fluidized-bed drying coupled with multi-stage air classification for a uniform particle size distribution (20 - 80 mesh).

Lot Verification: Every production run undergoes laboratory testing for intrinsic viscosity, residual monomer content, moisture, and dissolution rate. Retained samples are archived for 24 months.

Standard Packaging: 25 kg multi-layer kraft paper bags with inner polyethylene liners; 750 kg to 1000 kg FIBC bulk bags secured on export wooden pallets.

Marine Protection: Stretch-wrapped and heat-sealed with protective polyethylene hood film against moisture ingress.

Storage Environment: Store in dry warehouses (5°C - 30°C, relative humidity < 70%). Keep containers sealed to avoid caking.

Compliance Documentation: Manufactured in alignment with REACH pre-registration norms; supplied with batch-specific Certificates of Analysis (CoA) and GHS-compliant Safety Data Sheets (SDS).