Technical Product Profile: Industrial Defoamers

Product Classification and Characteristics

1. By Chemical Composition

Silicone-Based Defoamers

• Primary Components: Polydimethylsiloxane (PDMS) + hydrophobic silica

• Key Properties:

  • Surface tension: 20-21 mN/m

  • Temperature range: -40°C to 150°C

  • Particle size: 1-10μm dispersed phase

• Mechanism: Rapid spreading at air-liquid interface

Polyether Defoamers

• Molecular Structure: EO/PO block copolymers

• Performance Characteristics:

  • HLB value: 1-7 (oil-soluble types)

  • Cloud point: 40-90°C (temperature-dependent solubility)

  • Viscosity: 200-2000 cP at 25°C

Mineral Oil Defoamers

• Formulation Basis:

  • Carrier oil (60-80%)

  • Hydrophobic particles (10-20%)

  • Emulsifiers (5-15%)

• Dispersion Properties:

  • Average droplet size: 5-50μm

  • Specific gravity: 0.85-0.95

2. By Application System

Water-Based Defoamers

• Technical Parameters:

  • pH stability: 2-12

  • Ionic tolerance: ≤25% dissolved salts

  • Recommended dosage: 0.05-0.3%

Oil-Based Defoamers

• Performance Metrics:

  • Solubility parameter: 7-9 (cal/cm³)¹/²

  • Aniline point: 60-100°C

  • Dielectric constant: 2-4

Powder Defoamers

• Technical Specifications:

  • Carrier material: SiO₂ or CaCO₃ (85-95%)

  • Active content: 5-15%

  • Particle size distribution: D50=20-100μm

Technical Comparison

Selection Guidelines

Foam System Analysis Parameters

1. Continuous Phase:

   • Aqueous (conductivity >100μS/cm)

   • Organic (dielectric constant <15)

2. Temperature Profile:

   • Process temperature ±10°C margin

3. Shear Conditions:

   • High shear (>1000 rpm) requires smaller particle size

Performance Validation Methods

• Laboratory Testing Protocol:

  1. DIN 53902 standardized test

  2. ASTM D892 foam sequence testing

  3. Dynamic foam analyzer measurements

Technical Support

For detailed product specifications or application consultation, please contact our technical department.