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Silane USi-9301 – γ-Ureidopropyltrimethoxysilane
Uramido-Functional Silane for Superior Flexibility, Adhesion & Aqueous Stability
CAS No.: 23843-64-3
EINECS No.: 245-904-8
Molecular Weight: 222.31 g/mol
Chemical Name:
1-[3-(Trimethoxysilyl)propyl]urea
Synonyms:
γ-UreidopropyltrimethoxysilaneSilane USi-9301 is a unique uramido (urea-amide) functional silane coupling agent that delivers exceptional interfacial flexibility, elongation, and adhesion promotion between amino-reactive resins (epoxy, polyurethane, phenolic) and inorganic substrates (glass, metals, minerals). Its reduced alkoxy reactivity also provides outstanding hydrolytic stability in waterborne systems—making it ideal for eco-friendly coatings, adhesives, and composites.
🧪 Product Description
Chemical Structure:
H₂N–CO–NH–(CH₂)₃–Si(OCH₃)₃USi-9301 features a bifunctional molecular design:
- The trimethoxysilyl group hydrolyzes to form strong Si–O–substrate bonds with glass, silica, metals, and fillers
- The uramido (urea) group offers dual reactivity:
- Strong hydrogen bonding capability
- Reactivity with isocyanates, epoxies, and other amino-reactive polymers
- Unlike standard aminosilanes (e.g., APS), the urea moiety is less basic, reducing catalytic side reactions while enhancing flexibility and impact resistance at the interface
✅ Key Advantage: Combines the adhesion power of aminosilanes with the elasticity of urea chemistry—ideal for applications requiring high elongation, crack resistance, and durability under dynamic stress.
📊 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 transparent liquid Specific Gravity (20°C) 0.960 – 0.980 g/cm³ Refractive Index (nD25) 1.4400 – 1.4500 Purity (GC, %) ≥ 95.0%
🏭 Key Applications
🔹 Adhesion Promotion in Reactive Polymers
- Enhances bonding between epoxy, polyurethane, phenolic, and melamine resins and:
- Glass fibers (composites)
- Mineral fillers (CaCO₃, talc, clay)
- Metal surfaces (aluminum, steel)
- Improves wet adhesion, long-term durability, and thermal cycling resistance
🔹 Flexible Composite & Coating Formulations
- Imparts superior elongation and flexibility at the fiber/matrix or pigment/binder interface
- Reduces brittleness in high-filler systems—ideal for flexible electronics, sealants, and impact-resistant coatings
🔹 Waterborne & Low-VOC Systems
- The moderate reactivity of its methoxy groups (vs. more aggressive chlorosilanes) provides:
- Higher hydrolytic stability in aqueous environments
- Longer pot life in water-based primers, dispersions, and emulsions
- Enables development of eco-friendly, high-performance adhesives and coatings without sacrificing adhesion
🔹 Rubber-to-Metal Bonding
- Used in tire, hose, and vibration damper manufacturing to improve rubber-adhesive-metal bond strength under flex fatigue
📦 Packaging
Available in industrial-grade containers:
- 25 L pail
- 200 L drum
- 1000 L IBC tote
All packaging ensures moisture protection and product consistency.
⚠️ Safety & Storage
- 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
- Use in well-ventilated areas; wear standard PPE (gloves, goggles)
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Innovation Partner for Advanced Uramido Silane Technology- 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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