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USi-412 — Vinyl-tri(β-methoxyethoxy)silane
High-Performance Hydrophobic Coupling Agent for Mineral-Filled Polymers & Composites
CAS No.: 1067-53-4
EINECS No.: 213-934-0
Molecular Weight: 280.39
Synonyms:- Tris(2-methoxyethoxy)vinylsilane
- Vinyltris(methoxyethoxy)silane
✅ A bulky, hydrolytically stable vinyl alkoxysilane with exceptional filler-compatibility and long-term moisture resistance—ideal for high-loading composites, electrical insulation, and glass fiber reinforcement.
📄 Product Description
USi-412 features a polymerizable vinyl group and three β-methoxyethoxy (–OCH₂CH₂OCH₃) ligands, creating a sterically hindered yet highly effective coupling agent. The ethylene glycol ether chains provide:
- Slower, more controlled hydrolysis → superior shelf stability in formulations
- Enhanced compatibility with polar and non-polar polymers
- Strong hydrophobization of inorganic surfaces without compromising reactivity
Once bonded to fillers like silica, clay, or glass fibers, USi-412 forms a flexible, water-repellent interphase that dramatically improves composite performance—especially under humid or wet conditions.
(Chemical structure: CH₂=CH–Si[OCH₂CH₂OCH₃]₃)
📊 Typical Technical Data
⚠️ Values are typical and for reference only. Not to be used for specification without prior written confirmation from our technical team.
Parameter Specification Appearance Colorless transparent liquid Specific Gravity (20°C) 1.030 – 1.040 g/cm³ Refractive Index (nD20) 1.4275 – 1.4295 Purity (GC, %) ≥ 98.0%
🌐 Key Properties & Benefits
💧 Superior Moisture Resistance
- Forms a hydrophobic monolayer on filler surfaces
- Reduces water absorption in composites → maintains mechanical & electrical properties in wet environments
🌀 Improved Processability
- Enhances filler dispersion in polymer melts
- Lowers melt viscosity → easier extrusion, injection molding, and calendering
- Minimizes agglomeration and die buildup
⚡ Enhanced Electrical Performance
- Critical for cable insulation, encapsulation resins, and electrical molding compounds
- Maintains high volume resistivity and dielectric strength even after humidity exposure
🔗 Strong Interfacial Adhesion
- Vinyl group enables covalent bonding with unsaturated resins (e.g., polyester, epoxy, acrylics)
- Delivers excellent wet adhesion and wet scrub resistance in coatings and composites
🏭 Key Applications
🧱 Surface Treatment of Inorganic Fillers
- Used for silica, kaolin clay, talc, calcium carbonate, and other siliceous minerals
- Enables high filler loading (>60 wt%) while maintaining:
- Tensile/flexural strength
- Impact resistance
- Surface smoothness
⚙️ Crosslinked Polyester Molding Compounds
- Improves mechanical integrity and electrical reliability of SMC/BMC parts
- Reduces moisture-induced degradation in automotive, electrical, and appliance components
🧵 Glass Fiber Sizing & Reinforcement
- Applied in fiber sizing formulations to boost resin-fiber bonding
- Enhances composite strength, fatigue resistance, and long-term durability in:
- Wind turbine blades
- Automotive panels
- Pipes and tanks
🎨 Coatings & Adhesives for Wet Environments
- Added to primers or formulated into hybrid systems for marine, construction, and industrial maintenance coatings
- Provides outstanding adhesion retention after water immersion or cyclic humidity testing
📦 Packaging
- 25 kg HDPE pail
- 200 kg steel drum
- 1000 kg IBC tote
(All containers are sealed, moisture-protected, and labeled for industrial use)
🛡️ Safety & Storage
- Flammable liquid – keep away from heat, sparks, and open flame
- Store at ambient temperature in a dry, well-ventilated area
- Shelf Life: 24 months from production date in original unopened 200 kg drums
- Use standard PPE: nitrile gloves, safety goggles, and adequate ventilation
- Always consult the latest Safety Data Sheet (SDS)
→ Available at: www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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