In the high-viscosity solvent-borne and solvent-free defoamer spectrum, the "hydrophobic-particle-loaded polysiloxane composite" active architecture and ">98% non-volatile zero-solvent carrier" jointly dictate micro-foam piercing power, foam-suppression persistence, and clarity compatibility boundary in ultra-high-viscosity systems like epoxy self-leveling, thick-film UV screen inks, and unsaturated polyesters. Predecessor IOTA 29300 shares the same hydrophobic-particle polysiloxane, >98% non-volatile, but is specified at 200-500mPa·s for mid-viscosity; actual high-solids epoxy and thick-film UV inks routinely exceed 10,000cPs—demanding more emphasis on "micro-foam elimination" rather than macro-bubble knock-down. As epoxy floor coatings, screen-printing inks, UV inks, and UP systems demand "100% active, zero solvent, hydrophobic-particle fast micro-break, 0.01-1.00% ultra-wide dosage window," sourcing a defoamer with semi-transparent to turbid liquid, non-volatile >98% (150℃×3h), for high-viscosity solvent/non-solvent systems, 12-month shelf (5-40℃ sealed) has become the core gap for domestic high-vis micro-foam eliminator localization.
Addressing this "high-vis micro-break" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Defoamer IOTA 29200 (hydrophobic-particle-containing polysiloxane compound, 100% solids). Characterized by "semi-transparent to turbid liquid, non-volatile >98%, recommended 0.01-1.00%, best added before milling/stirring for antifoam, 25kg square PE/iron drum or 200kg PE/iron drum, 5-40℃ sealed avoid heat/freeze, 12-month shelf, non-flammable non-haz," and backed by "hydrophobic particle pierce + polysiloxane low-tension spread + 100% solvent-free zero-VOC," it serves as the "hydrophobic-silicone anchor" for micro-foam elimination in high-vis solvent-borne/non-solvent systems including epoxy floor, screen ink, UV ink, and unsaturated polyester.
Molecular Architecture: Hydrophobic Particles + Polysiloxane + 100% Active 3D Logic
The core competitiveness of IOTA 29200 stems from its "polysiloxane backbone carrying hydrophobic particles (e.g., hydrophobic silica/wax microparticles) dispersed in silicone oil continuous phase" non-aqueous defoamer architecture:
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Hydrophobic Particle Micro-Pierce: Particles with contact angle >90° create local weak points on bubble films; when defoamer migrates to air-liquid interface, particles pierce the micro-bubble wall, causing rapid collapse—specifically targeting micron-scale bubbles that conventional defoamers miss in high-viscosity matrices.
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Polysiloxane Low-Tension Spread: Siloxane backbone (~21mN/m) slowly but persistently migrates to bubble surfaces in high-viscosity epoxy/UP, displacing surfactants and dropping film strength; post-spread ultra-thin silicone film continuously suppresses new foam (antifoam).
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100% Active Zero-Solvent: No volatile carrier—avoids introducing VOC or moisture that could cause curing bubbles in solvent-free epoxy/PU or UV cure defects; high actives also mean lower shipping cost and stable storage.
Performance Leap: From "Conventional Defoamer Leaves Micro-Foam" to "Hydrophobic Silica Micro-Break"
Incorporating IOTA 29200 enables qualitative leaps:
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Epoxy Self-Leveling Floor: 0.05-0.3% added before milling—micro-bubbles eliminated during troweling, pinhole rate -85%+, mirror finish; no intercoat adhesion loss.
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UV Screen Ink: 0.01-0.1% in UV screen ink—micro-foam knocked down instantly, screen dots sharp no clog, cured film smooth no fish-eyes; clarity systems need pre-test for compatibility.
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Unsaturated Polyester: 0.05-0.5% in UP casting/hand-layup—styrene micro-foam suppressed, surface bubble-free, mechanical strength retained.
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High-Vis Solvent Industrial: 0.05-0.5% in high-solids anti-corrosion/thick-film coatings—no micro-foam trapped in >200μm wet film, dry film dense pinhole-free.
Application Penetration: From Self-Leveling to Thick-Film UV
IOTA 29200 covers sectors triply sensitive to "high-viscosity + solvent-free/high-solids + micro-foam elimination":
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Epoxy Flooring: Self-leveling, solvent-free midcoat/topcoat, conductive epoxy floor.
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Printing Inks: Screen printing (solvent/UV), UV ink, thick-film gravure.
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Unsaturated Polyester: UP casting, artificial stone, hand-layup FRP.
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High-Vis Industrial: High-solids marine/container coatings (compatibility pre-test needed for clear systems).
IOTA Technical Guide: Pre-Dilute Use-Now, Pre-Mill Add Best
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Best Add Timing: Add before milling or stirring for best antifoam effect (lets hydrophobic particles disperse uniformly during pigment grind); can also add post-production but must stir thoroughly. Recommended 0.01-1.00% (adjust per viscosity and film thickness).
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Dilution: Given >98% active, pre-dilute 1:9 with aromatic solvent (xylene/toluene/solvent naphtha) to 10% before adding; use diluted product immediately (hydrophobic particles settle).
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Thixotropy Handling: Product is thixotropic—viscosity rises on long rest or low temp (<5℃), normal; stir well before use, warm water bath (30-40℃) if needed.
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Clarity Note: For clear epoxy/varnish, pre-test compatibility—hydrophobic particles may cause slight haze; if full clarity needed, reduce to 0.01-0.05% or select more compatible defoamer.
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Taboo Red Line: No direct contact with water/waterborne systems (hydrophobic particles agglomerate on water contact); avoid strong cationic surfactants (may break or reduce efficiency); non-haz but avoid high heat (>40℃) and freezing (<5℃) during storage/transport.
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Storage: 25kg square PE/iron drum, 200kg PE/iron drum (multiple options); 5-40℃ sealed storage, avoid heat and freeze; shelf 12 months, retest after expiry, use only if qualified; non-flammable non-haz, general chemical transport.
Industry experts note that under solvent-free epoxy floor popularization, UV thick-film printing high-speed adoption, and UP product surface-quality tightening, hydrophobic-particle 100% active polysiloxane micro-foam eliminators are upgrading from "BYK/Tego import followers" to "high-viscosity non-solvent micro-foam reference auxiliaries." IOTA 29200, with its ">98% non-volatile + hydrophobic particle micro-pierce + 0.01-1.00% ultra-wide window + 5-40℃ stable" hard metrics,
fills the domestic supply chain gap for defoamers in high-viscosity solvent-borne/non-solvent micro-foam elimination, providing a mass-producible path to replace imported BYK-A 501, Tego Foamex 825 for downstream flooring and ink enterprises. This confirms domestic solvent-free defoamers are advancing steadily along "emulsion → solvent-based concentrate → 100% active hydrophobic-particle type," with growing technical say in high-viscosity micro-foam control key materials.
