Cationic Polyacrylamide

1.Product Characteristics

1.1 Basic Properties and Physicochemical Characteristics

1.2 Performance Characteristics

• High Flocculation Efficiency
  • Produces significant flocculation effects at extremely low dosages (typically 1-10 ppm), creating large and tightly structured flocs.
• Rapid Settling Properties
  • Promotes formation of settbleable flocs from suspended particles in water within short periods (typically 3-15 minutes).
• Broad Sepctrum Adatability
  • Effective flocculation for various negatively charged contaminants (such as organic matter, clay, silicates, etc)
• Low Temperature Adaptability
  • Maintains good flocculation effects in temperature ranges of 5-45°C, with some products suitable for use below 0°C.
• Ionic Selectivity
  • Not sensitive to multivalent metal ions (such as Ca²⁺, Mg²⁺ ), remains effective in high-hardness water.
• Concentration Enhancement Effect
  • Significantly improves sludge thickening ratio and dewatering performance, reducing sludge volume by 30-50%.
• Flexible Dosage Adjustment
  • Dosage can be adjusted within a wide range according to water quality characteristics and treatment requirements, offering great operational flexibility.
• Good Synergy with other treatment agents
  • Can be used in combination with inorganic flocculants (such as polyaluminum chloride), oxidants, and other water treatment chemicals.

2.Mechanism of Action

2.1 Flocculation Mechanisms

2.1a Charge Neutralization

1. Cationic groups neutralize surface charges of negatively charged particles in water.
2. Reduces electronstatic repulsion between particles.
3. Neutralization efficiency is directly related to polymer ionicity (typically 10-70%).

2.1b Polymer Bridging Effect

1. Long chain molecules simultaneously adsorb multiple particles, forming "molecular bridges".
2. Bridging effect positively correlated with molecular weight (3 million - 18 million).
3. Floc structures formed are more stable and less prone to breakage.

2.1c Network Capture Effect

1. Polymer chains form network structures.
2. Physically capture fine particles.
3. Particularly effective for colloids and fine particles (

   2.1d Hydrophobic Association

   1. Some modified CPAMs contain hydrophobic groups.
   2. Enhance flocculation of organic contaminants through hydrophobic interactions.
   3. Particularly effective in oil-water separation applications.

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   2.2 Key Factors Affecting Flocculation Efficiency

   2.2a Molecular Characteristic Factors

   • Affects bridging capability and floc strength
   • Affects charge neutralization capability and solubulity
   • Linear structures typically provide better flocculation than branched structures.

   2.2b Application Condition Factors

     Dosage: optimal dosage window is typically narrow, overdosing can lead to restabilization.

     pH value: optimal range typically 6-9, extreme pH affects performance.

     Mixing intensity: requires appropriate initial mixing intensity (G value approximately 300-700 s⁻¹).

     Retention Time: typically requires 3-15 minutes for flocculation.

   2.2c Water Quality Factors

   • Suspended solid characteristics
     • Particle size, surface charge, and concentration
   • Water temperature
     • Low temperatures (
     • Ionic Strength
       • Salt content in water affects polymer conformation and adsorption characteristics.
     • Interfering Substances
       • Organic matter, surfactants, etc. Also can compete with CPAM for adsorption.