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USi-1312 — γ-Aminopropylmethyldiethoxysilane
A Monofunctional Amino Silane for Controlled Reactivity, Silicone Synthesis & Long-Term Adhesion
CAS No.: 3179-76-8
EINECS No.: 221-660-8
Molecular Weight: 191.34
Synonyms:- 3-Aminopropyl(diethoxy)methylsilane
- 3-(Diethoxymethylsilyl)propylamine
- N-(3-Triethoxysilylpropyl)amine analog (monomethyl variant)
✅ A partially substituted amino silane with one primary amine, two ethoxy groups, and one non-hydrolyzable methyl group—offering balanced reactivity, excellent storage stability, and ideal functionality for amino silicone synthesis and durable adhesion.
📄 Product Description
USi-1312 features a primary amine (–NH₂) group at the end of a propyl chain and a methyldiethoxysilane head (–Si(CH₃)(OC₂H₅)₂). This unique structure delivers:
- Controlled hydrolysis: Only two hydrolyzable ethoxy groups → slower condensation vs. trialkoxy silanes
- Reduced crosslink density: The inert methyl group limits network formation → enhanced flexibility
- High compatibility: Lower polarity improves solubility in organic systems
- Primary amine reactivity: Strong affinity for epoxies, isocyanates, acrylics, and phenolics
This makes USi-1312 the preferred building block for soft, wash-durable amino silicone oils and a stable adhesion promoter in demanding industrial formulations.
(Chemical structure: H₂N–(CH₂)₃–Si(CH₃)(OC₂H₅)₂)
📊 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) 0.911 – 0.971 g/cm³ Refractive Index (nD20) 1.4220 – 1.4320 Purity (GC, %) ≥ 97.0%
🌟 Key Advantages & Differentiators
🧴 Ideal for Amino Silicone Oil Synthesis
- Primary raw material for single-amino functional silicone fluids
- Imparts fabrics with:
- Silky softness and smooth hand feel
- Excellent drape and anti-static properties
- Wash durability and wrinkle resistance
- The methyl group prevents excessive crosslinking → maintains fluidity and compatibility
🔗 Stable Adhesion Promotion
- Bonds strongly to glass, metals, minerals, and fibers via silanol condensation
- Amine group reacts with epoxy, PU, phenolic, and acrylic resins
- Provides long-term adhesion even under thermal cycling or humidity
⏳ Extended Resin Shelf Life
- Unlike trialkoxy amino silanes (e.g., APS), USi-1312’s diethoxy + methyl structure reduces self-condensation
- Enables >6 months shelf life in cold-cure phenolic/furan foundry resins without viscosity drift
🌀 Improved Filler Dispersion & Compatibility
- Acts as a coupling agent and dispersant for:
- Silica, clay, calcium carbonate, glass fibers
- Enhances mechanical strength, impact resistance, and processability in filled composites
🏭 Key Applications
🧵 Functional Silicone Synthesis
- Core monomer for amino-modified PDMS used in:
- Textile softeners & finishing agents
- Hair conditioners & personal care emulsions
- Release coatings requiring controlled adhesion
🧪 Foundry Resins (Phenolic & Furan)
- Added to cold-box or no-bake binders to:
- Boost flexural strength of cured sand cores
- Maintain low viscosity during storage
- Extend pot life without sacrificing cure speed
🧱 Mineral-Filled Composites & Plastics
- Pretreats fillers for use in:
- Engineering thermoplastics (PA, PBT)
- Thermosets (epoxy, polyester)
- Elastomers (EPDM, silicone)
- Reduces moisture sensitivity and improves interfacial stress transfer
🎨 Primers for Glass & Metal
- Dilute solutions (0.5–2%) applied to substrates before coating or bonding
- Eliminates need for aggressive surface treatments in many industrial applications
🔧 Abrasives & Grinding Wheels
- Enhances bond strength between phenolic resin and abrasive grains (e.g., Al₂O₃, SiC)
- Improves wheel integrity and cutting performance
📦 Packaging
- 20 kg HDPE pail
- 180 kg steel drum
- 900 kg IBC tote
(All containers are nitrogen-purged and sealed to prevent moisture ingress and CO₂ absorption)
🛡️ 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 containers
- Use PPE: nitrile gloves, safety goggles, and adequate ventilation
- Note: Primary amines may absorb CO₂ from air → slight cloudiness over time (does not affect performance)
- 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: service@usichemical.com
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