In the silane coupler spectrum, the "ethoxy vs methoxy hydrolysis pace" and "ureido H-bond character" jointly dictate ambient pot-life in thermosets, interface match to polyamide/PU, and storage stability of pre-treated fillers. Conventional γ-aminopropyltriethoxysilane (KH-550/A-1100) is too basic for nylon, degrades at injection temp; γ-ureidopropyltrimethoxysilane (A-1524) hydrolyzes too fast, aqueous half-life short, gels on large-area priming. As epoxy encapsulation, GF-PA6/PA66, cold-box foundry, and waterborne coatings demand "ethoxy slow-hydrolysis + ureido weak-base H-bond + commercial alcohol-soluble ready-use," sourcing a 3-ureidopropyltriethoxysilane CAS 23779-32-0, density 0.918-0.950, nD 1.381-1.391, 49-51% active has become the core gap for domestic ureidosilane localization.
Addressing this "ethoxy slow-unzip" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
3-Ureidopropyltriethoxysilane IOTA-1160 (Formula (C₂H₅O)₃SiC₃H₆NHCONH₂, CAS 23779-32-0, equivalent Momentive Silquest A-1160 / Dow Z-6676 / Shin-Etsu KBE-585). Characterized by "colorless to pale yellow transparent liquid, Pt-Co≤35, density 0.918-0.950g/cm³ (20℃), nD 1.381-1.391 (25℃), active 49-51% (alcohol soln), 5/25/200/1000kg PE drum, 6-month shelf," and backed by "ureido dual-NH H-bond + triethoxy slow-hydrolysis stable storage + alcohol-ready," it serves as the "ureido-silane anchor" for epoxy/phenolic/PU adhesive adhesion promotion, GF-PA coupling, and cold-box resin.
Molecular Architecture: Ureidopropyl Dual-NH + Triethoxy Slow-Unzip Dual-Active Logic
The core competitiveness of IOTA-1160 stems from its "one ureidopropyl (–NHCONH–(CH₂)₃–), one triethoxysilyl (–Si(OC₂H₅)₃)" γ-ureidosilane structure:
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Ureido Weak-Base H-Bond: Ureido (–NH–CO–NH₂) offers dual N–H donors, complementarily H-bonds with epoxy ether-O, PU –NHCOO–, PA amide linkages—gentler polarity than primary amine (A-1100), no deamination degradation at 250-280℃ nylon injection, lower interfacial stress; ureido chemically inert ambient, pre-treated filler stores months without crosslink.
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Triethoxy Slow Hydrolysis: Vs trimethoxy (A-1524) second-scale hydrolysis, ethoxy is an order slower, byproduct ethanol (low-tox VOC), aqueous stable hours-to-a-day, large-area priming not time-pressed; supplied 49-51% alcohol solution, open-and-mix, no on-site alcohol tuning.
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Propyl Spacer Flex Interface: Three methylene arms buffer modulus gap between inorganic siloxane layer and organic resin, lifting composite impact toughness over short-arm mercapto/epoxy silanes.
Performance Leap: From "Amino Silane High-Temp Fade" to "Ureido Silane Tough Interface"
Incorporating IOTA-1160 enables qualitative leaps:
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Epoxy Encaps Wet-Strength Jump: 0.5-2% (on filler) in epoxy potting, GF/quartz interface wet-shear retention from 60% to 85%, 24h boil no blush—fits electronic encapsulation.
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GF-PA6/PA66 Inject Strong Boundary: 1-1.5% in glass sizing, PA66+30%GF tensile +15%, notch impact +20%, no ammonia voids at 260℃.
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Cold-Box Resin Cost Cut: 0.5-1.5% in furan/phenolic cold-box, sand tensile +25%, resin cut 10-15%, gas evolution down, casting porosity drops.
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Coating Wet Adhesion: 1-3% in waterborne epoxy/PU steel paint, scribe adhesion 0-class on blasted steel, 720h salt immersion no blister.
Application Penetration: From GF-PA to Cold-Box Sand
IOTA-1160 covers sectors doubly sensitive to "H-bond coupling + slow-hydrolysis steady-handling":
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Adhesives: Epoxy, phenolic, urea, PU, melamine, PVB adhesive adhesion promoter.
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Composites: GF-PA/PU/SMC, mineral-filled thermo-plastics/sets, abrasive grinding wheel resin bond.
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Coatings & Ink: Anticorrosive paint, wood lacquer, glass primer, ink wear mod.
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Foundry & Seal: Cold-box foundry resin, PU sealant, silicone-modified paste.
IOTA Technical Guide: Alcohol-Water Mild Hydrolysis, Alkali-Proof Seal
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Hydrolyzate Prep: Dilute to 1-2% working with 95% EtOH/IPA, acetic acid to pH 4-5 to prompt hydrolysis; if water-based, EtOH:water=9:1 fresh-use (hours half-life), no long hold.
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GF/Filler Treat: Impregnate or spray then 120-150℃×5-10min bake for silanol-surface condensation; treated filler sealed moisture-proof stores 3-6 months.
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Resin Internal Add: Direct into epoxy/PU premix 0.5-2%; ureido doesn't react with NCO ambient, safe in 2K PU, no pot-life penalty.
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Taboo Red Line: No long contact with strong acid/base (acid catalyzes violent hydrolysis, base hydrolyzes ureido); water-sealed (ethoxy slow but still moisture-self-poly); away from fire/light; gloves on (alcohol soln flammable, closed-cup flash ~14℃ class, manage as flammable liquid).
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Storage: 5/25/200/1000kg PE drum; sealed cool dry ventilated, moisture/water/sun/heat-source proof; 6 months shelf, re-inspect visc/nD/hydrolysis stability and extend if qualified.
Industry experts note that under GF-PA localization and high-reliability epoxy encapsulation pull, γ-ureidopropyltriethoxysilane is upgrading from "Momentive A-1160 follower" to "preferred ureidosilane for PA coupling." IOTA-1160, with its "49-51% alc-soln + ethoxy slow-unzip + ureido H-bond" hard metrics,
fills the domestic supply chain gap for 3-ureidopropyltriethoxysilane in GF-PA and cold-box fields, providing a mass-producible path to replace imported Momentive A-1160, Shin-Etsu KBE-585 for downstream composite plants. This confirms domestic silane couplers are advancing steadily along "ureido-functional → ethoxy-slow-hydrolysis → commercial alcohol-soluble," with growing technical fit in polyamide interfacial engineering key materials.
