Overview
High-purity polyacrylamide (HPAM) is a synthetic polymer derived from acrylamide monomers, engineered for specialized industrial applications requiring minimal impurities. Its linear or cross-linked structure enables exceptional water solubility and flocculation performance. HPAM is classified by charge type (anionic, cationic, or non-ionic) and molecular weight, which dictate its suitability for specific uses. The high-purity grade (>90%) is critical for sectors like potable water treatment and pharmaceuticals, where contaminant limits are stringent.
Physical and Chemical Properties
HPAM appears as a white powder or granules with a density of approximately 1.30 g/cm³. It decomposes at 210–250°C without melting, making thermal processing challenging. The polymer’s viscosity in solution increases with molecular weight, enabling tailored rheological control. Its solubility in water is instantaneous, forming colloidal solutions that stabilize suspensions. HPAM is chemically inert to most solvents but degrades under prolonged UV exposure or oxidative conditions. Hydrolysis of amide groups can occur in alkaline environments, altering its charge density.
Main Applications
In water treatment, HPAM acts as a flocculant to aggregate suspended solids, enabling efficient sedimentation. Municipal plants use cationic HPAM for sludge dewatering, while anionic types dominate mining wastewater remediation. The oil industry relies on HPAM for enhanced oil recovery (EOR), where it thickens injection water to displace trapped crude. Paper manufacturers apply it as a retention aid to improve fiber bonding and reduce wastewater BOD. Emerging uses include agriculture (soil conditioning) and biomedical hydrogels.
Safety and Storage
While HPAM is non-toxic, dust inhalation during handling may cause respiratory irritation. PPE (gloves, goggles, masks) is recommended. Spills should be contained to prevent slippery surfaces. Storage requires airtight containers in dry, ventilated areas below 25°C. Moisture absorption leads to clumping and reduced efficacy. Shelf life is typically 12–24 months. Avoid mixing with strong oxidizers or acids, which may trigger decomposition.
B2B Procurement Guide
Buyers should specify ionic type, molecular weight range (e.g., 10–15 million g/mol for EOR), and purity (≥90% for high-end applications). Anionic HPAM dominates the market due to cost-effectiveness, while cationic grades command premium pricing. Bulk procurement (20+ tons) often reduces unit costs by 15–20%. Verify supplier certifications (ISO 9001, REACH) and request batch-specific COAs (Certificates of Analysis). Spot purchases may incur volatility due to acrylamide feedstock price fluctuations.
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