Coating Craters? Blame Silicone Mismatch-Iota

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News > Dynamic industry > Coating Craters? Blame Silicone Mismatch

Coating Craters? Blame Silicone Mismatch

Recently, water-based industrial paint makers report frequent fish-eyes and craters after adding silicone leveling agents. Initial blame falls on contamination, but the real culprit is surface tension mismatch.

Acrylic resins typically exhibit surface tension of 30–40 mN/m, while conventional polydimethylsiloxane (PDMS) silicones sit at just 18–22 mN/m. When this gap is too wide, silicone migrates aggressively to the air-film interface, over-spreading and triggering micro-phase separation. The result: localized retraction and crater formation, especially under fast-drying conditions.

Experts stress that compatibility—not mere addition—is key. Polyether-modified silicones, with adjusted surface tension (24–28 mN/m), offer better harmony with aqueous systems. Precise dosing and high-shear dispersion further reduce defect risk. As one formulator noted, “It’s not about using silicone—it’s about using the right one.”

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