In the reactive silicone oligomer spectrum, the chain-end structure of "bis alcohol hydroxyl (—CH₂OH) + central PDMS backbone + side long-chain alkyl (n≈30, m=3)" and "avg Mw 3550/4000Da, OHV 25.0 KOHmg/g, hydroxyl 0.8%, visc 1500-2500cSt, solids ≥98%" jointly dictate diol-equivalent activity in —NCO/—COOH copolymerization, siloxane segment surface enrichment orientation, and organic-resin compatibility boundary brought by alkyl arms. Plain α,ω-dihydroxy PDMS lacks alkyl modification, poor compatibility with PU/polyester causing phase separation; side-hydroxy silicones have uncontrolled reactive sites; physically blended silicone oils migrate and bleed. As silicone-modified PU resins/emulsions, 2K PU baking paints, and amino baking varnishes demand "bis-alcohol end + long-chain alkyl compatibilizer + OHV close to polyester/polyether diol + colorless pale-yellow + 25kg PE/200kg iron drum + 1yr," sourcing a ~4000Da, diol-substitutable, surface-enriching non-migrating domestic product has become the core gap for silicone-modified PU/polyester localization.
Addressing this "alkyl cantilever" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Bis-Hydroxyalkyl-Terminated Long-Chain Alkyl Silicone Oil IOTA-8865H (end —CH₂OH, n=30, m=3, avg Mw 3550/4000). Characterized by "colorless to slightly yellow transparent liquid, hydroxyl 0.8%, avg Mw 4000, visc 25℃ 1500-2500cSt, solids ≥98%, OHV 25.0(KOHmg/g), copoly activity with —NCO/—COOH near polyester/polyether diol, 25kg PE/200kg iron drum, non-haz, 1yr shelf," and backed by "bis-OH embed main chain + long-chain alkyl compat arm + siloxane surface enrichment," it serves as the "copolymer puzzle" for silicone-modified PU/polyester resins, 2K PU bake, amino bake.
Molecular Architecture: Bis-OH Embed Main Chain + Long-Chain Alkyl Arm + Siloxane Enrich 3D Logic
The core competitiveness of IOTA-8865H stems from its "HO—CH₂—(alkyl arm)—Si(CH₃)(long alkyl)—O—(Si(CH₃)₂—O)ₙ—Si(CH₃)(long alkyl)—(alkyl arm)—CH₂—OH" precise architecture:
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Bis-OH Embed Main Chain: Both ends —CH₂OH urethane with —NCO (MDI/TDI 85℃, IPDI 110℃) or condense with —COOH, both ends fixed into polymer backbone—siloxane becomes permanent soft segment not physical dispersion, eliminating migrate/bleed/recoat-loss of ordinary silicone oils.
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Long-Chain Alkyl Compat Arm: C-long alkyls on Si act as "organic compatibilizer," drastically improving miscibility with polyester/polyether diols and acrylics—no float, no gel, no storage separation.
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Siloxane Surface Enrich: On cure, flexible siloxane flips to air interface, long alkyls stand as low-energy fence—COF drops, velvet touch, marker/soy-sauce/fingerprint wipe-clean (anti-graffiti), chemically anchored survives alcohol rub.
Performance Leap: From "Physical Blend Migrate" to "Bis-OH Copolymer Permanent Modify"
Incorporating IOTA-8865H enables qualitative leaps:
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Silicone-Modified PU Resin/Emulsion: Replace 5-20% polyester/polyether diol in prepolymer, MDI/TDI 85℃ or IPDI 110℃ copoly—resin silky, Taber abrasion ↑, low-temp flexible.
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2K PU Bake / Amino Bake: Add into hydroxy main resin disperse uniformly, —OH reacts with —NCO/amino resin into network—film anti-block, anti-graffiti, fewer craters.
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Silicone-Modified Polyester: Co-condense with diacid/diol, gives polyester film/strip-coil coating slip self-clean, for appliance panel/architectural coil.
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Synthetic Leather / Textile Coating: Substitute part polyol in PU leather paste—leather anti-block, fold-cycles doubled, breathable comfort.
Application Penetration: From Phone-Case Paint to Hiking-Shoe Coating
IOTA-8865H covers sectors triple-sensitive to "reactive embed + long-chain compat + anti-graffiti touch":
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Industrial Coatings: 2K PU bake, amino bake, metal/plastic topcoat, anti-graffiti public facility paint.
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Resin Synthesis: Silicone-modified PU resin/emulsion, silicone-modified polyester, waterborne PU dispersion modify.
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Consumer Coatings: Phone-case paint, premium furniture lacquer, sports/shoe PU coating, auto-interior PU leather.
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Functional Film: Anti-fingerprint film, easy-clean appliance panel, synthetic leather finish.
IOTA Technical Guide: With Polyol Charge, Control Temp Copoly, Moisture-Proof
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PU Synthesis: Charge with polyester/polyether diol simultaneously or post-add; MDI/TDI 85℃ copoly, IPDI ~110℃ copoly; dosage 5-20% of polyol total.
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Bake Paint: Directly into hydroxy main resin disperse (<60℃ to avoid premature reaction), cure with —NCO/amino resin into network; recommend 1-5% on total.
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Taboo Red Line: Moisture-proof—end OH not violently water-reactive but long moisture hurts dosing accuracy; avoid strong acid/base/iso alone open long; contact with MDI/TDI starts reaction, mixed batch not storable.
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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 coatings upgrading from "post-add silicone adjuvant" to "front-end silicone-block copolymer", and anti-graffiti/easy-clean appliance panel demand booming, bis-alcohol hydroxyalkyl silicone oils are upgrading from "Shin-Etsu KF-6001/6002, Tego 5000 followers" to "diol-equivalent copolymer reference modifier." IOTA-8865H, with its "Mw≈4000 + OHV 25.0 + visc 1500-2500cSt + solids ≥98% + long-alkyl compat + 1yr" hard metrics,
fills the domestic supply chain gap for reactive silicone-modified PU/polyester oligomers in copolymer-embed / anti-graffiti touch fields, providing a mass-producible path to replace imported reactive silicone modifiers for downstream resin/paint makers. This confirms domestic reactive silicones are advancing steadily along "physical blend (migrate) → side-hydroxy (uncontrolled) → bis-OH PDMS (poor compat) → bis-alcohol long-alkyl 8865H (copoly embed + alkyl compat)," with growing technical say in silicone-modified resin key oligomers.
