Mono-OH End, Post-Stage Surface Lock
— IOTA 8861 Mono-Alcohol-Hydroxy Long-Chain Alkyl Silicone Oil (Mw≈1300, OHV 40.5) Sets the Amino-Bake / PU End-Cap Surface-Mod Drop Point
In the reactive silicone oligomer spectrum, the end-group "mono alcohol-hydroxyl (—CH₂OH) + central PDMS + opposite long-chain alkyl cap (C8-C18)" and "avg Mw 1300Da, OHV 40.5, hydroxyl 0.50±0.10%, visc 200-800cSt, solids ≥98%, n₂₅D 1.4300±0.0050" jointly dictate single-point anchoring in —NCO/—COOH reaction (no extra crosslink, no gel), synergistic PDMS+alkyl surface flip enrichment, and low-dose (0.5-2.0%) efficacy boundary in amino-bake/2K-PU. Bis-end 8865H embeds both ends for bulk modification; mono-end 8861 is "one head bonded, one head cantilever" for surface tailoring—physical silicone migrates, bis-end needs high-temp co-charge; mono-end low-Mw (1300) post-stage cap is the lightest anti-graffiti fix for amino bake. As amino-bake/2K-PU demand "mono-functional cap, post-add, anti-oil-pen, slip anti-block, low-visc easy-disperse," sourcing a ~1300Da OHV40.5 post-stage non-gelling domestic product has become the core gap for coating surface-modification localization.
Addressing this "post-stage surface lock" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Alcohol-Hydroxy Mono-Terminated Long-Chain Alkyl Silicone Oil IOTA 8861 (mono-end —CH₂OH, opposite long alkyl, avg Mw 1300). Characterized by "colorless to slightly yellow transparent liquid, OHV 40.5(KOHmg/g), hydroxyl 0.50±0.10%, avg Mw 1300, visc 25℃ 200-800cSt, solids ≥98%, nD 1.4300±0.0050, high activity with —NCO/—COOH, PU synthesis post-stage end-cap, amino-bake 0.5-2.0% add, 25kg PE/200kg iron drum, non-haz, 1yr," and backed by "mono-OH post-cap + long-alkyl compat arm + PDMS flip enrich," it serves as the "surface drop point" for amino-bake/2K-PU/silicone-mod PU end-cap/addition silicone ink.
Molecular Architecture: Mono-OH Post-Cap + Long-Alkyl Arm + PDMS Flip Enrich 3D Logic
The core competitiveness of IOTA 8861 stems from its "HO—CH₂—(alkyl arm)—Si(CH₃)(long alkyl)—O—(Si(CH₃)₂—O)ₙ—Si(CH₃)(long alkyl)—(long alkyl cap)" precise mono-end architecture:
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Mono-OH Post-Stage Cap: Only one —CH₂OH reacts with residual —NCO (late PU stage) or amino/—COOH, single-point anchor no extra crosslink—thus can be charged at resin synthesis late stage (or after prepolymer extension) as end-capper, unlike bis-end 8865H needing co-charge with polyol and no viscosity spike/gel. After reaction silicone segment permanently fixed at chain end, non-migrating.
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Long-Alkyl Compat Arm: C8-C18 alkyl on Si gives strong affinity to amino/PU/acrylic resins, 200-800cSt low-visc easy disperse, post-add no precipitate no float; vs pure PDMS mono-alcohol oil, 8861 "dissolves in, stays put" in organic systems.
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PDMS Flip Enrich: On cure, anchored end static, PDMS+opposite long alkyl flip to air interface forming nano low-energy fence—contact angle ↑, oil-pen ink beads, fingerprint/soy wipe-clean (anti-graffiti), COF ↓ (slip), stack no-block.
Performance Leap: From "Bis-End Co-Poly Heavy Process" to "Mono-End Post-Stage 0.5% Cap"
Incorporating IOTA 8861 enables qualitative leaps:
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Amino Bake / 2K-PU: Post-add 0.5-2.0% disperse uniform, at 140-180℃ bake silicone flips enrich—film anti-oil-pen (ASTM D6578 class), silky touch, stack no-block, fewer craters, no intercoat adhesion loss.
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Silicone-Mod PU Resin/Emulsion: Late-stage (last 30-60min) cap residual —NCO, get end-silicone PU, storage stable no visc rise, film surface self-enriches anti-stain.
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Addition Silicone / Ink: Minor add improves demold, surface slip, stain-resist; in ink lifts mar-resist and writing fluency.
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Vs 8865H: 8865H (Mw4000/OHV25/bis-end) bulk wear embed needs 85-110℃ co-poly; 8861 (Mw1300/OHV40.5/mono-end) surface slip anti-graffiti 0.5-2% post-stage, process one order lighter.
Application Penetration: From Appliance Amino Panel to Synthetic Leather Finish
IOTA 8861 covers sectors triple-sensitive to "mono-end cap + low-dose anti-graffiti + post-stage easy process":
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Industrial Bake: Appliance amino panel, metal furniture enamel, auto-part amino mid/topcoat.
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2K-PU: Woodware PU topcoat, plastic-shell PU handfeel paint, auto-interior PU coat.
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Resin Synthesis: Silicone-mod PU resin/emulsion (post cap), waterborne PUD surface mod.
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Silicone & Ink: Addition silicone goods demold slip, premium screen/pad ink mar-resist.
IOTA Technical Guide: Post-Stage Cap, 0.5-2% Disperse, Moisture-Proof Non-Haz
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PU Resin Synth: Prepoly/extend late stage (last 30-60min, residual —NCO) add 0.5-1.5%, ~85℃ cap; or post-graft drop.
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Amino/PU Bake: Into finished main resin disperse (<60℃), 0.5-2.0%; cure 140-180℃ silicone enriches surface.
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Taboo Red Line: Moisture-proof—end OH not violent but long moisture hurts dosing; avoid strong acid/base long; contact with —NCO reacts, mixed with isocyanate main agent not storable; waterborne needs pre-emulsify (not self-emulsifying).
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Storage: 25kg PE/200kg iron drum; non-haz, ventilated dry sealed, shelf 1yr; over-shelf retest visc/OHV/compat and extend if qualified; routine PPE, avoid eye.
Industry experts note that under high-end bake paints upgrading from "post-add amino silicone adjuvant (migrate decay)" to "mono-OH post-stage chemical cap (permanent surface)" and appliance-panel anti-graffiti mandatory standards rising, mono-alcohol-hydroxy long-chain alkyl silicone oils are upgrading from "Shin-Etsu/Momentive mono-functional followers" to "Mw1300/OHV40.5 post-cap reference surface modifier." IOTA 8861, with its "Mw≈1300 + OHV 40.5 + visc 200-800cSt + solids ≥98% + 0.5-2% low add + 1yr" hard metrics,
fills the domestic supply chain gap for mono-end hydroxy silicone oils in amino-bake/PU-cap anti-graffiti fields, forming with bis-end 8865H a "mono-lock-surface / bis-embed-chain" complementary pair. This confirms domestic reactive silicones are advancing steadily along "physical silicone (migrate) → bis-end hydroxy co-poly (heavy process) → mono-end hydroxy 8861 (post-stage cap lightweight)," with growing technical say in coating surface-engineering key oligomers.
