Among polyether-modified silicone oils,
non-reactive grades (IOTA 245/21057) enrich at the interface for leveling/wetting;
reactive terminal-hydroxy grades upgrade polyether silicone from "additive" to "monomer"—terminal –OH bites into PU prepolymer (–NCO), epoxy (–CHO), polyester (–COOH) networks, permanently staying in-film without migration, yellowing, or tack. As PU synthetic leather demands "dry silky feel with dry/wet rub resistance", high-speed fiber spinning demands "miscible with mineral oil yet water-washable", and waterborne resins demand "hydroxy chain-extension for hydrolytic stability", a
light-yellow to amber clear, bis-alcohol-hydroxy capped, PDMS–(CH₂)₃–O–(EO/PO)–OH block, 100% non-volatile hydroxy-terminated polyether silicone emerges as the reactive anchor folding "silicone slip + polyether hydrophilic + terminal hydroxy reaction" into one ABA structure.
Addressing this "bis-hydroxy block" slot,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) releases
IOTA 23667 Bis-Terminal Hydroxy Polyether Modified Silicone Oil. Defined by core parameters—
HO–(EO/PO)–O–(CH₂)₃–SiMe₂O–(SiMe₂O)ₙ–SiMe₂–O–(CH₂)₃–(EO/PO)–OH, reacts with NCO/COOH/epoxy/amino, water-soluble washable—it carries the triple attributes of
"organic miscibility + reactive anchoring + easy-wash antistat," serving as the "reactive silicone block anchor" for fiber spin lube, PU-leather feel modifier, fabric coating anti-stick, and resin hydrolytic-stability booster.
Molecular Architecture: ABA Block Bis-Alcohol Hydroxy Welding Logic
IOTA 23667 writes HO–(CH₂CH₂O)ₐ(CH₂CHO)ᵦ–(CH₂)₃–O–SiMe₂O–(SiMe₂O)ₙ–SiMe₂–O–(CH₂)₃–(CH₂CHO)ᵦ(CH₂CH₂O)ₐ–OH:
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Bis-Alcohol Hydroxy Ports: Both polyether ends capped with primary OH; with PU prepolymer –NCO forms urethane bond, with epoxy opens ring, with carboxylic acid/anhydro esterifies, with amino resin condenses. Added into PU slurry it copolymerizes into main chain—unlike amino silicone it does not migrate/yellow, unlike polyether silicone it does not wash off.
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Mid PDMS Slip Core: Siloxane backbone gives low friction (μ to ~0.1 level), weather, low-temp flexibility (Tg shifted negative), surface-seeking (flips to film face on cure).
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EO/PO Tunable Hydrophile: High EO → water-soluble (easy wash, antistat for fiber); high PO → lipophilic (miscible with mineral oil/DMF/PU slurry). 23667 takes balanced ratio: dissolves in water yet miscible with organic lubricants far better than ordinary dimethyl silicone.
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200-500 cSt Mid Viscosity: Thicker than low-MW hydroxy silicone (e.g. 2030-5 at 21 cSt) to control migration as PU modifier; thinner than high-MW hydroxy silicone for pumpable dispersion.
Performance Leap: From Physical Slip to Chemically Networked
In fiber lube, PU leather mod, and fabric coating contexts, 23667 pays off at once:
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Synthetic Fiber Integrated Treat: In spin finish (with mineral oil/fatty ester/antistat), inter-fiber friction drops, breakage less; EO segment antistat, water-washable, no silicone spot on later dyeing.
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PU Synthetic Leather / Si-PU: Charged with polyol into PU prepolymer, 0.5-10% gives dry silky leather, dry/wet rub ≥500 cycles, anti-stick to calender, low-temp bend no crack; hydrolytic stability up (silicone segments block water).
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Fabric Resin Coating: Into acrylic/PU coating paste → anti-block release, abrasion up, leveling better, fewer pinholes; curtain/shade fabric roll no tack.
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Epoxy/Polyester Mod: Hydroxy chain-extender introduces silicone segment, lowers internal stress, lifts toughness, surface slip; floor paint internal anti-graffiti easy-clean.
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Daily Cross: After emulsification, hydrophilic silicone conditioner (no yellow, rinse-clear vs amino silicone).
Application Penetration: From PET DTY to PU Sofa Leather
IOTA 23667 precisely lands on the interface needing
"silicone slip + organic miscibility + chemical anchor":
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Fiber Oil: PET POY/DTY, nylon, acrylic spin finish wetting lube.
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PU Leather: Dry/wet process slurry, microfiber leather, shoe upper, sofa leather top feel.
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Coating & Adhesive: Fabric PU coating, waterborne acrylic print paste, epoxy floor, Si-PU court.
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Resin Synthesis: Silicone-PU block copolymer, polyester mod, amino baking varnish leveling slip.
PU-leather formulators read 23667 plainly: it is the domestic isomorphic of
XIAMETER OFX-3667, ACM 8-722, KH-3667—bis-primary-hydroxy, ABA block, 200-500 cSt, 1.04 gravity, three numbers aligned with import supply specs. The value is not a new reaction but folding "washable fiber lube + reactive PU-leather slip + coating anti-stick wear" into one bucket of pale-amber clear oil, so synthetic-leather and spin-finish plants have a swap when OFX-3667 lead time wobbles.
