Overview
50% Cationic Polyacrylamide (PAM) is a high-performance water-soluble polymer engineered for applications requiring strong charge neutralization. With 50% of its monomer units carrying positive charges, it excels in binding negatively charged particles like clay, organic matter, and microorganisms. This specialty flocculant is synthesized through copolymerization of acrylamide with cationic monomers like dimethylaminoethyl acrylate (DMAEA). The high charge density makes it particularly effective in challenging conditions where standard PAM grades underperform, such as high-salinity wastewater or systems with high colloidal content.
Physical and Chemical Properties
The material appears as free-flowing white granules with a slight amine odor. Its viscosity in solution depends on molecular weight and concentration, typically forming 0.1–0.5% working solutions. The cationic groups provide excellent stability across a wide pH range (3–10), outperforming anionic PAM in acidic conditions. Key distinguishing features include a charge density of approximately 5 meq/g and intrinsic viscosity >10 dL/g. The polymer exhibits pseudoplastic flow behavior in solution, with viscosity decreasing under shear. Thermal stability allows use in processes up to 60°C, though prolonged exposure to temperatures above 80°C may cause chain scission.
Main Applications
In municipal wastewater treatment, 50% cationic PAM is the preferred choice for belt filter presses and centrifuge dewatering, often achieving 25–35% dry solids content in sludge cakes. The oil industry utilizes it as a clay stabilizer in drilling fluids and for produced water clarification. The paper industry accounts for approximately 30% of demand, where it functions as a retention aid and drainage accelerator. Emerging applications include mining tailings management and food processing wastewater treatment, where its high charge density effectively captures fine particles and organic colloids.
Safety and Storage
While non-hazardous per GHS classification, the powder form presents a dust explosion risk (minimum explosive concentration ~30 g/m³). Storage requires sealed containers in ventilated areas, separated from strong oxidizers. Shelf life is typically 12–18 months in original packaging. Handling precautions include NIOSH-approved dust masks and eye protection. Spills should be wetted to prevent dust dispersion before cleanup. Dissolution requires special attention to avoid 'fisheyes' – partially hydrated gel particles that reduce effectiveness. Best practice involves using eductor systems for gradual dispersion in stirred tanks.
B2B Procurement Guide
Industrial buyers should specify ionic degree (50±2%), molecular weight range, and solubility characteristics. Bulk shipments (>20 metric tons) typically offer 8–12% cost savings. Key quality indicators include solution viscosity (Brookfield LV, 0.1% solution) and residual monomer content (<0.05%). Leading manufacturers include SNF Floerger, BASF, and Kemira. For specialty applications, request pilot-scale testing with actual process water. Contract terms should address moisture content (<7%), particle size distribution (80% through 20 mesh), and batch-to-batch consistency guarantees. Consider regional suppliers for logistics advantages in time-sensitive applications.
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