Molecular weight: Ranges of Anionic polyacrylamide widely from several hundred thousand to over twenty million. The higher the molecular weight, the greater the solution viscosity and the stronger the flocculation performance.
Stability: Anionic polyacrylamide is stable under neutral and alkaline conditions. Hydrolysis may occur under acidic conditions. High temperatures (above 60°C) or strong oxidants can cause molecular chain breakage and performance degradation.
Anionic polyacrylamide is a linear polymer formed by the copolymerization of acrylamide monomer with anionic monomers such as acrylic acid (AA) or sodium acrylate. The molecular chain of this polymer contains a large number of carboxyl groups (-COOH) or carboxylic acid sodium groups (-COONa). These anionic groups give it excellent water solubility and charge properties. Its molecular formula can be expressed as: -[-CH₂-CH(CONH₂)-]ₘ-[-CH₂-CH(COONa)-]ₙ-, where m and n represent the degree of polymerization of acrylamide and anionic monomers respectively. By adjusting the ratio of the two, the anionic degree of the product (usually 10%-80%) can be changed.
Technical Index
CAS No: 9003-05-8
Formula: (C3h5no)N
EINECS: 207-173-7
|
Item |
Apperance |
Molecular Weight(million) |
Solid Content(%) |
Insoluble Matter(%) |
Dissolution rate (Min) |
PH value |
Hydrolysis Degree(%) |
|
Apam |
White grit or powder |
300-2200 |
≥90 |
≦0.2 |
≦45 |
5-14 |
10-30 |
|
Packing: 25kg Kraft paper packing bag,or as customerized. Particle size: 20-80 mesh |
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Usage and Precautions
Dissolution Procedure
• Solvent: Use clean fresh water (avoid using water containing impurities or high hardness).
• Concentration: Prepare a 0.1%-0.3% aqueous solution (the higher the molecular weight, the lower the concentration).
• Dissolution Steps:
①Slowly sprinkle the reagent while stirring (rotation speed 60-200 rpm) to avoid agglomeration.
② Continue stirring for 30-60 minutes until complete dissolution (water temperature 20-30℃ can accelerate dissolution).
③The solution should be used within 24 hours after dissolution; avoid long-term storage as it may lead to degradation.
Dosage Points
• Dosage: Determine through beaker tests based on water quality. Generally, it is 0.1-10mg/L.
• Dosage Sequence: For treating complex wastewater, usually add inorganic flocculants (such as PAC) first, then add APAM, and both should be separated by 1-2 minutes.
• Mixing Conditions: The addition point should ensure thorough mixing, but the shear force should not be too large (such as pipe mixer or low-speed stirring) to avoid disrupting the molecular chain.
Influencing Factors
• pH Value: The optimal application range is neutral to alkaline (pH 7-14). Acidic conditions may lead to a decrease in flocculation effect.
• Temperature: The dissolution speed slows down when the water temperature is lower than 5℃, and above 60℃ may cause molecular chain breakage.
• Water Quality Components: Metal ions in the water (such as Ca²⁺, Mg²⁺) may affect the flocculation effect. Adjust the dosage or use other agents in combination.
Storage and Safety
• Storage: Store sealed in a cool and dry place, protected from moisture and sunlight, with a shelf life of 2 years.
• Safety Protection: Powdered products are prone to flying. When operating, wear masks and gloves; if contact with skin or eyes, immediately rinse with plenty of water.
Typical Application Cases
1.A water treatment plant
2.A iron ore beneficiation wastewater
Anionic polyacrylamide used widely in minerals selection, metallurgy, coal washing, food, steel, spinning and papermaking industry which involves separation of solid-liquid and waste water treatment. APAM can also be used for oil well and oil extraction in oil industry, and retention aids and intensifier in papermaking industry.
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