In waterborne coating production and application, foam is a persistent problem affecting film appearance and application efficiency. Agitation, roller coating, spray, and pigment wetting all introduce air, forming stable foam. If the defoamer has poor compatibility, it causes craters, fish eyes, or film collapse. Traditional mineral oil defoamers tend to bleed out in fine-particle high-gloss coatings, affecting intercoat adhesion. Ordinary silicone emulsions, if poorly controlled in particle size or emulsifier matching, may demulsify or float, causing craters. With waterborne industrial, wood, and architectural coatings demanding "fast defoaming, durable foam suppression, good compatibility, no effect on film appearance", finding a "polydimethylsiloxane emulsion, nonionic, specially treated, low-addition high-efficiency" waterborne defoamer has become a key formulation issue. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. officially launches Waterborne Defoamer IOTA 2303. Characterized by "polydimethylsiloxane emulsion; appearance milky white liquid; active content 30±2%; emulsifier type nonionic", backed by "silicone low surface tension + nonionic broad compatibility + specially treated high activity", it serves as the "clean-foam choice" for waterborne coating defoaming and foam suppression, achieving the leap from "ordinary silicone emulsion poor compatibility, easy cratering" to "specially treated silicone emulsion defoaming and suppression". System Positioning: Nonionic Silicone Defoamer Emulsion vs. Mineral Oil/Anionic Silicone IOTA 2303 belongs to the nonionic polydimethylsiloxane O/W defoamer emulsion family, distinct from mineral oil defoamers and anionic silicone emulsions. Mineral oils bleed out in high-PVC coatings, affecting adhesion; anionic silicone emulsions repel cationic coatings or some resin charges, causing flocculation. IOTA 2303 uses a nonionic emulsification system to fit wide pH and resin systems; the siloxane backbone provides low surface tension for fast bubble breaking; nonionic emulsifiers ensure dispersion stability without floating oil. Molecular Architecture: PDMS + Nonionic Emulsification + Special Treatment The core design of IOTA 2303 comes from specially treated silicone emulsion structure:

• PDMS Active: The siloxane backbone is flexible and methyl groups give very low surface energy, far below water and most waterborne resins. It rapidly spreads on foam lamellae, lowering local surface tension to thin and rupture the film for fast defoaming.
• Nonionic Emulsification: Nonionic surfactants emulsify the silicone oil into a uniform O/W emulsion with broad compatibility in waterborne coatings, avoiding charge conflicts with resins and additives.
• Special Treatment: Specially treating the organosiloxane gives better defoaming and foam suppression than general silicone emulsions, with higher activity and persistence.

Performance Leap: From "Defoam But Crater" to "Clean Foam No Trace" Introducing IOTA 2303 brings the following improvements:

• Good Defoaming: Quickly breaks foam generated during production, reducing pinholes, bubbles, and fish eyes.
• Durable Foam Suppression: Continuously inhibits foam regeneration during production and application, ensuring batch stability.
• Good Compatibility: Nonionic type fits wide waterborne coating systems, reducing crater and floating risks.
• Low-Dosage Efficiency: Recommended dosage only 50–500 ppm based on total formulation, reducing cost.
• Application Convenience: Can be diluted with 1–5 times water before adding to defoaming occasions, flexible in operation.
• Safe Storage/Transport: Stored and transported as non-hazardous goods, lowering compliance cost.

Application Penetration: From Coating Production to Application IOTA 2303 is mainly used for defoaming in waterborne coating production:

• Coating Production: Defoaming and suppression in waterborne industrial, wood, architectural coatings, and waterborne inks.
• Dispersion Stage: Added during pigment/filler dispersion to prevent foam encapsulation and reduced dispersion efficiency.
• Letdown Stage: Supplemented during letdown to control final coating foam.
• Application: Foam control in roller coating, spray, and curtain coating.

IOTA Technical Guide: Dilute and Add, Avoid Heat and Freezing

• Application: Recommended dosage 50–500 ppm based on total formulation. Can be diluted with 1–5 times water before adding to defoaming occasions. Avoid long-term storage of diluted liquid; prepare fresh.
• Addition: Can be added at different production stages — dispersion or letdown — fixed by coating process through trial.
• ⚠️ Taboo: Store sealed at 5–40℃, avoid high temperature and freezing during transport and storage to prevent demulsification, skinning, or freeze damage. Reseal after use to prevent skinning. Use deionized water for dilution to avoid flocculation from hard-water ions. Do not directly mix with strong electrolytes causing demulsification.
• Storage: 50kg plastic drum (or customized per user request); store sealed at 5–40℃; avoid high temperature and freezing during transport and storage; shelf life 6 months; transported and stored as non-hazardous goods. Unlike 209 series (0–40℃/18 months) and C803/C910 (2–30℃/12 months), IOTA 2303 follows 5–40℃ sealed, heat-and-freeze-avoid, 6-month guidelines.

Industry Insight: The core value of waterborne silicone defoamers lies in "PDMS low surface tension for fast bubble breaking, nonionic emulsification for broad compatibility, special treatment for high suppression persistence". IOTA 2303, with "polydimethylsiloxane emulsion, milky white liquid, active 30±2%, nonionic, recommended 50–500 ppm, specially treated high activity" hard parameters, fills the clean-foam base link of domestic nonionic silicone defoamer emulsions in waterborne coating production. For coating manufacturers, it upgrades appearance pass rate and application efficiency along the path of "mineral oil defoamer → ordinary silicone emulsion → specially treated nonionic silicone emulsion".