In waterborne polyurethane and acrylic coating systems, ordinary silicone oil emulsions or amino silicones are often added for handfeel improvement, but conventional products are mostly low-solid emulsions; excessive external water dilutes the main formula, causing viscosity drop, solid loss and rheology change, requiring extra adjustment. Some waterborne wax emulsions offer limited anti-tack but impair coating transparency, giving a waxy greasy feel and surface migration over time. Common dimethyl silicone emulsions have narrow compatibility with PU/acrylic, easily causing demulsification, oil float and craters. For specifications demanding "high solid, no viscosity drop, soft anti-tack, slippery handfeel, universal for waterborne resins", a strictly controlled hydroxy-functional high-molecular polysiloxane high-solid emulsion places anti-tack and handfeel at one dosing node. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Waterborne Coating Anti-Tack Agent IOTA 2020. Characterized by "hydroxy-containing high-molecular polysiloxane emulsion; light yellow paste; active content 80%; recommended to use host liquid as diluent; additive for waterborne PU and acrylic coatings, improving softness and anti-tack, giving slippery handfeel; 80% high-concentration needs no water dilution, direct addition feasible, recommended to pre-dilute 10-20x with host liquid before blending; dosage 0.5-2%; 50kg plastic drum or customized; sealed storage 0-40℃, avoid high temperature and freezing, 12 months shelf life; non-hazardous chemical", backed by "hydroxy siloxane high polymer + 80% high-solid paste + self-liquid dilution compatibility", it serves as a high-solid anti-tack slippery adjuvant for waterborne coatings. System Positioning: Hydroxy High-Molecular Silicone Emulsion Among Coating Adjuvant Families Within waterborne coating handfeel adjuvant families, IOTA 2020 is a hydroxy-containing high-molecular polysiloxane emulsion, distinct from common dimethyl silicone emulsion (narrow compatibility, oil float, weak anti-tack), amino silicone microemulsion (soft but yellowing-prone, long-term tacky migration), and waterborne wax emulsion (impairs clarity, waxy greasy feel, no lasting slip). IOTA 2020 uses high-molecular siloxane as flexible backbone and hydroxy groups for polar anchoring; 80% active introduces almost no external water. It positions as a shared high-solid anti-tack handfeel adjuvant for "waterborne PU coating + waterborne acrylic coating", rather than a common defoamer, leveling agent or crosslinker. Molecular Architecture: Hydroxy High-Molecular Polysiloxane + High-Solid Paste + Self-Dilution Compatibility IOTA 2020 active body is a hydroxy-containing high-molecular polysiloxane emulsified into light yellow paste. High-molecular siloxane segments form a durable lubricating film on coating surface, reducing friction coefficient at 0.5-2% dosage; side-chain or terminal hydroxy groups provide polarity, forming hydrogen bonds or physical anchoring with PU urethane groups and acrylic hydroxy/carboxy groups, minimizing silicone oil migration, bleed-out and re-tack; 80% active means only ~20% external water, so direct addition hardly dilutes system viscosity and solid content; the recommendation to pre-dilute 10-20x with the host liquid (the waterborne PU or acrylic coating itself) ensures uniform dispersion without introducing alien aqueous phase that causes demulsification. Performance Leap: From "Low-Solid Emulsion Diluting Formula, Waxy Tack" to "Hydroxy Siloxane Paste High-Solid Anti-Tack" With IOTA 2020, waterborne coatings improve jointly: handfeel—high-molecular siloxane spreads into uniform film, 0.5-2% imparts slippery, soft touch, reducing surface roughness and tack; anti-tack—low surface energy of siloxane reduces coating surface free energy, effectively improving inter-layer blocking resistance and peel resistance against contact surfaces; no viscosity drop—80% high solid introduces almost no water, avoiding significant viscosity slide common with low-solid silicone emulsions, reducing post-thickening adjustment; compatibility—one 0.5-2% window fits both waterborne PU and acrylic without separate schemes; process—paste easy to weigh, 50kg drum or customized, 0-40℃ sealed 12-month shelf life, non-hazardous for easy workshop management. Application Penetration: From Waterborne PU Coating to Acrylic Paint IOTA 2020 covers two core scenarios. Waterborne PU coating: anti-tack and handfeel improvement on synthetic leather, fabric and plastic PU finishes—emphasizing slippery non-re-tack, soft non-yellowing; dose 0.5-2% by trial, pre-dilute 10-20x with host liquid before adding to PU system. Waterborne acrylic coatings: tactile optimization and block resistance for architectural, wood and industrial acrylic topcoats—emphasizing friction reduction and stacking anti-tack; same 0.5-2% gradient trial, confirm compatibility with colorants, defoamers and thickeners. ⚠️ Taboo: sealed storage 0-40℃, strictly avoid high heat and freezing to prevent demulsification; use host liquid not pure water for dilution to avoid local breaking; if expired, retest appearance and dispersion stability, continue if qualified. IOTA Technical Guide: Self-Liquid Pre-Dilution, Gradient Trial, Constant-Temp Storage IOTA 2020 is a light yellow paste in standard 50kg plastic drums. Recommended process: take 1 part product, add 10-20 parts host liquid (the waterborne PU or acrylic coating to be modified), stir at medium speed into uniform thin emulsion, then slowly add this pre-dilution into main batch with medium-speed agitation until homogeneous. Direct addition at high-shear mixing stage is feasible if dispersion is guaranteed. Dosage 0.5-2%, finalized by coating thickness, resin solid and handfeel target trials. Store sealed at 0-40℃ in cool ventilated place, prevent moisture evaporation and contamination; avoid sun exposure and freezing during transport; non-hazardous chemical, managed as general cargo. Industry Insight: The key to high-solid silicone emulsion for waterborne anti-tack is not blindly maximizing solid content, but using hydroxy groups for anti-migration anchoring, high molecular weight for lasting slip, 80% solid for no viscosity/solid drop, and self-liquid dilution for dispersion safety. For waterborne PU and acrylic engineers, IOTA 2020 uses one hydroxy high-molecular polysiloxane 80% paste across coating softness and anti-tack, taking high-solid no-dilution, slippery no-re-tack and self-dilution no-demulsification as batch-checkable anchors, reducing low-solid dilution, waxy tack and silicone migration rework.