In waterborne coatings and peelable protective additive systems, the "hydrophilic modification mode" and "end-group reactivity" of polysiloxane jointly dictate surface auto-enrichment after film formation, chemical bonding depth with waterborne resins, and dry-film anti-tack durability. Conventional nonionic/anionic silicone emulsions (e.g., IOTA 2052 hydroxy silicone) soften but lack active surface-driving force, requiring high dosage for anti-graffiti with migration fade; common polyether silicones are too hydrophilic, post-film water-sensitive and tacky, unable to form peelable layers. As water-based anti-graffiti paints, peelable protective films, and waterborne release coats demand "water-dilutable, end-primary-hydroxy graftable, silicone auto-surface-segregating, low-temp flexible wear-resistant," sourcing a hydroxypropyl-modified PDMS emulsion with ≥45% active and linear primary hydroxyl ends has become the core gap for domestic waterborne silicone functional additive localization.
Addressing this "waterborne surface-seeking" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Modified Hydroxypropyl Silicone (Water System) IOTA 2040 (Chemical Name: Hydroxypropyl modified polysiloxane, CAS 63148-57-2). Characterized by "milky white liquid, active ≥45%, 1/25/200kg drums, 12-month shelf," and backed by "primary hydroxyl active grafting + hydroxypropyl hydrophilic anchoring + silicone auto-surface segregation," it serves as the "waterborne silicone anchor" for water-based anti-graffiti coatings, peelable release layers, aqueous release agents, and mold release.
Molecular Architecture: Hydroxypropyl Side-Graft + Primary Diol Ends Dual-Active Logic
The core competitiveness of IOTA 2040 stems from its "PDMS backbone – side hydroxypropyl – end primary hydroxyl" linear waterborne-modified structure:
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Hydroxypropyl Hydrophilic Anchor: Side –CH₂CH(OH)CH₂– (hydroxypropyl) enables inherently hydrophobic PDMS to pre-emulsify and stably disperse in water (≥45% active, solvent-free); hydroxypropyl H-bonds with polar groups of waterborne resins (acrylic, PUD), preventing total silicone float.
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Primary Diol Ends Active Graft: Both ends capped with primary hydroxyl (–CH₂OH), which can react with isocyanates (–NCO), amino resins, epoxies to "nail" silicone chains into coating network rather than mere physical bleed-out; this makes anti-graffiti layer both isolating and wear-durable, not wiped away.
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Silicone Auto-Surface-Seeking: During film formation, PDMS backbone (surface energy ~21mN/m) spontaneously migrates to air interface, forming nano-scale siloxane monolayer—a "low-surface-energy release film": marker ink beads up, graffiti wipes off with damp cloth or alcohol; chemically bonded so isolation doesn't fade over time.
Performance Leap: From "Physical Bleed" to "Chemical Surface-Seeking"
Incorporating IOTA 2040 enables qualitative leaps in waterborne systems:
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Waterborne Anti-Graffiti Scrub: 6-20% in waterborne acrylic/PU—dry film CA >100°, marker ink beads, wipes clean; extra peelable effect—graffiti layer strips off whole, ideal for public benches, subway wall temporary protection.
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Low-Temp Flex Impact: Silicone chains lower Tg, film folds at -20℃ no crack, suits northern outdoor waterborne steel paints.
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Release Waterborne: As waterborne release (6-15%) on release paper/film, bake 120-150℃ gives dry silicone film, peel force 5-30g/25mm controllable, replaces solvent-borne silicone release, near-zero VOC.
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Wear-Heat Upgrade: PDMS backbone lifts continuous heat to 150℃+, and lubricating silicone film cuts friction coefficient, boosts scratch cycles 2-3×.
Application Penetration: From Subway Anti-Graffiti to Release Liner
IOTA 2040 covers sectors doubly sensitive to "waterborne application + low-surface-energy isolation":
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Anti-Graffiti Coatings: Public facility waterborne protection, school wall peelable coats, urban furniture anti-poster treatment.
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Waterborne Release: Release paper/film aqueous coating, PSA label backing primer.
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Mold Release: Rubber/PU waterborne release, casting mold isolation.
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Coating Modification: Waterborne wood lacquer hand agent, leather finish anti-tack additive.
IOTA Technical Guide: Avoid Tin/Acid, Water-Dilute & Heat-Bake
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Dilution Addition: Dilute with DI water directly to working conc (6-20% solid), add slowly under stirring to avoid local breaking; if system pH<7, pre-adjust to 7-8 with ammonia to prevent end-hydroxy protonation deactivation.
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Cure Crosslink: For anti-graffiti, pair with NCO or amino-resin crosslinker (e.g., waterborne PUD hardener), mid-temp (100-130℃×5-15min) or ambient (24h) cure; heat cure drives more complete surface segregation.
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Release Application: Coat then bake 120-180℃×30-60s; peel force tunable with bake temp/time—higher/longer gives denser silicone film, lower peel.
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Taboo Red Line: Strictly no long contact with tin or tin-alloy containers (tin catalyzes siloxane degradation, shortens storage stability and post-cure performance); avoid direct mixing with strong acid/base (end primary OH esters with acid, dehydrogens with strong base); shelf 12 months, discard if stratified crust after expiry.
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Storage: 1/25/200kg PE drums, non-haz; sealed ambient storage, antifreeze (<0℃ may freeze-break); use stainless/plastic tools, avoid tin contact.
Industry experts note that as "waterborne, low-VOC, peelable anti-graffiti" becomes the mainstream trend for public facility protection and green packaging, hydroxypropyl-modified waterborne silicone is upgrading from "auxiliary hand agent" to "functional isolation core." IOTA 2040, with its "primary diol + hydroxypropyl hydrophilic + auto-surface-segregating" hard metrics,
completes the cost-performance puzzle for domestic waterborne hydroxypropyl silicone emulsion in anti-graffiti and waterborne release fields, providing a mass-producible path to replace imported Evonik TEGO Protect series, Dow waterborne anti-graffiti additives for downstream coating plants. This confirms domestic waterborne silicone auxiliaries are advancing steadily along "hydroxypropylation → end-hydroxy activation → surface-functionalization," with growing technical say in waterborne functional silicone materials.
