High-concentration color pastes (>35% pigment) enhance color depth in oil-based PU coatings but trap microfoam in viscous systems, causing craters and gloss loss. Chemi Tech's KM-305 defoamer overcomes this via synergistic rheology-foam control technology.
Innovation: Rheology-Defoaming Synergy
Viscosity Reduction: Polyether branches cut paste viscosity by 30%, improving flowability;
Persistent Foam Suppression: Nano-silica carriers deliver siloxane to pigment surfaces, inhibiting bubble regeneration.
Case: Mirror-Black Faucet Coating
A faucet manufacturer struggled with fisheyes and gloss inconsistency (60° gloss: 80-85) using 40% carbon black paste. With KM-305:
Process Integration: 0.4% dosage during paste pre-dispersion, boosting efficiency by 20%;
Surface Quality: Achieved mirror finish (60° gloss >95) with zero craters or peeling (cross-hatch test);
Durability: ΔE shift <1.5 after 500 hours of 85℃/85% RH aging.
Advanced Applications
Gradient Coating: High flowability enables seamless interlayer blending;
High-Temp Baking: Withstands 180℃ curing for automotive OEM paints;
Wood Sealers: Penetrates wood pores to evacuate air, eliminating bubble traps.
Chemi Tech's polarity-matching technology adjusts defoamer HLB values to align with pigments, maintaining thixotropy during high-shear grinding.