Defoamer M37 (High-Efficiency Industrial Foam-Control Agent)

Foam in industrial processing is an undesirable colloidal dispersion of air bubbles in an aqueous medium stabilized by surface-active agents (surfactants, emulsifiers, or proteins). Left uncontrolled, foam causes tank overflow, pump cavitation, reduced batch density, extended grinding times, and surface finish defects.

Defoamer M37 is a high-potency, 100% active concentrated foam control agent engineered from modified organo-polysiloxanes and hydrophobic silica particles suspended in a paraffinic mineral carrier. It combines rapid initial foam knock-down with long-lasting foam suppression persistence under high-shear manufacturing conditions.

KIKI'S Industrial Chemicals imports Defoamer M37 directly from certified manufacturers in India in 45 kg and 180 kg drums. We supply paint formulators, polymer synthesis plants, adhesive compounders, and industrial effluent operators across Kenya, providing technical guidance to prevent cratering and surface defects.

Defoaming Mechanism: Knock-Down vs Persistence

An effective defoamer must accomplish two distinct thermodynamic tasks: enter the surfactant-stabilized bubble lamella, and spread across the liquid-air interface:

• Entering & Spreading: Defoamer M37 droplets have lower surface tension than the aqueous surfactant matrix. The droplets rapidly enter the foam wall and spread outward, displacing surfactant molecules with a weak, non-elastic film.
• Hydrophobic Dewetting: Embedded hydrophobic silica particles act as pin-point dewetting nuclei. As the bubble wall thins, the particle bridges the lamella, causes sudden liquid dewetting, and ruptures the bubble instantaneously.

Dosage Optimization and Surface Defect Prevention

Defoamer chemistry represents a delicate balance between foam control and formulation compatibility:

CRITICAL FORMULATION PRINCIPLE: There is no universal defoamer dosage. Defoamer M37 is typically dosed between 0.1% and 0.5% by weight of the total formulation. Under-dosing fails to control macrofoam, while over-dosing produces surface defects such as cratering, pinholing, and fish-eyes.

In water-based architectural paints, formulators achieve the best balance by splitting the addition: adding 50% of the defoamer during the high-speed pigment dispersion phase (grind stage) to suppress air entrapment, and the remaining 50% during the gentle letdown stage to ensure long-term can storage and roller application stability.