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Silane USi-A402 – Vinyltriacetoxysilane (VTAS)
Fast-Curing Acetoxysilane Crosslinker for RTV Silicones & Polymer Modification
CAS No.: 4130-08-9
EINECS No.: 223-943-1
Molecular Weight: 232.26 g/mol
Chemical Name:
Vinyltriacetoxysilane
Synonyms:
VTASSilane USi-A402 is a high-reactivity vinyl-functional acetoxysilane that combines the rapid moisture-cure capability of acetoxy chemistry with the versatility of a polymerizable vinyl group. It serves as a dual-function crosslinker and adhesion promoter in one-component RTV silicone rubbers, polyolefin modification, and filler treatment—delivering fast cure, strong bonding, and enhanced composite performance.
🧪 Product Description
Chemical Structure:
CH₂=CH–Si(OCOCH₃)₃USi-A402 uniquely merges two powerful functionalities in one molecule:
- The three acetoxy groups (–OCOCH₃) hydrolyze rapidly upon exposure to atmospheric moisture, releasing acetic acid and forming reactive silanols that condense into a siloxane network—enabling fast RTV curing
- The vinyl group (CH₂=CH–) provides:
- Enhanced adhesion to organic substrates (plastics, coatings)
- Reactivity with peroxides for grafting onto polyolefins (e.g., PE, PP)
- Compatibility with vinyl-functional silicone polymers for optimized network formation
✅ Key Advantage: A high-efficiency, multifunctional acetoxysilane that accelerates cure while improving adhesion and enabling polymer modification—ideal for formulators seeking performance beyond standard methyl or ethyl analogs.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless to yellowish transparent liquid; may form white crystals at lower temperatures Specific Gravity (20°C) 1.17 g/cm³ Refractive Index (nD) 1.4152 Purity (GC, %) ≥ 90.0% Note: Crystallization at low temperatures is reversible upon warming and does not affect performance.
🏭 Key Applications
🔹 RTV One-Component Silicone Rubber (Acetoxy Type)
- Acts as a primary crosslinker in vinyl-modified RTV-1 sealants, enabling:
- Rapid surface and through cure
- Excellent adhesion to glass, metals, and many plastics
- Improved mechanical properties (tensile strength, elongation) due to vinyl participation in the network
🔹 Polymer Modification (e.g., Polyethylene)
- Used as a crosslinking agent in silane-grafted polyolefins
- Enables moisture-induced crosslinking after extrusion (similar to PEX-b process), enhancing:
- Thermal resistance
- Environmental stress crack resistance (ESCR)
- Mechanical durability
🔹 Coupling Agent for Fillers & Fibers
- Treats inorganic fillers (silica, calcium carbonate), glass fibers, and mineral reinforcements to:
- Improve dispersion in polymer matrices
- Enhance mechanical and electrical properties of composites
- Render surfaces hydrophobic, reducing moisture sensitivity
🔹 Adhesion Promoter in Specialty Formulations
- Boosts bonding in hybrid sealants, coatings, and adhesives where both fast cure and organic-inorganic compatibility are required
⚠️ Safety & Storage
- Corrosive: Releases acetic acid during cure—use in well-ventilated areas
- Store in original unopened containers at or below 35°C
- Keep away from heat and open flame
- Shelf Life: 12 months from production date under recommended conditions
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📦 Packaging
Available in industrial-grade, moisture-barrier containers:
- 25 L pail
- 200 L drum
- 1000 L IBC tote
All packaging is designed to prevent moisture ingress and maintain reactivity.
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Innovation Partner in High-Performance Vinyl Acetoxysilanes- 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 - Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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