Ethoxydimethylvinylsilane

Product Details

CasNo： 5356-83-2

MF： C6H14OSi

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information

2. Physical Properties

The compound exhibits physical characteristics optimized for ease of handling, formulation compatibility, and industrial processing:

• Appearance: Colorless, transparent liquid (no turbidity, sediment, or discoloration; visual clarity confirms low impurity levels).
• Density (25°C): 0.79 g/mL – less dense than water, enabling easy mixing with organic solvents and silicone polymers, and reducing transportation weight.
• Boiling Point: 99°C (at 760 mmHg) – moderate boiling point, avoiding premature volatilization during compounding (e.g., filler treatment) while allowing efficient removal of excess via vacuum distillation.
• Flash Point (Closed Cup): 4°C – classified as a highly flammable liquid (extreme fire risk); strict fire prevention, electrostatic grounding, and explosion-proof measures are mandatory.
• Vapor Pressure (25°C): 44.8 mmHg – high volatility, which accelerates its reaction with hydroxyl groups on filler surfaces but requires sealed storage to minimize losses.
• Refractive Index (n₂₀/D): 1.398 – a precise optical parameter used for rapid purity verification in quality control (deviations >0.002 indicate contamination by low-molecular-weight alkanes or siloxanes).
• Solubility: Sparingly soluble in water (undergoes slow hydrolysis); fully miscible with organic solvents (ethanol, acetone, toluene, ethyl acetate) and silicone fluids (e.g., dimethyl silicone oil, vinyl-terminated silicones), supporting flexible formulation design.

3. Chemical Properties

Its unique combination of vinyl and ethoxy groups delivers dual reactivity, while the silicon-carbon bond ensures structural stability:

• Dual Reactivity of Functional Groups:
  • Ethoxy Group (−OC2​H5​): Undergoes hydrolysis reactions (catalyzed by acids, bases, or moisture) to form silanol groups (−SiOH). These silanol groups readily react with hydroxyl groups on the surface of inorganic fillers (e.g., silica, aluminum oxide) or substrates, forming covalent Si-O bonds that improve filler dispersion and interfacial adhesion.
  • Vinyl Group (−CH=CH2​): Participates in addition reactions (e.g., hydrosilylation with Si-H-containing silicones, free-radical polymerization with olefins) to introduce silicone segments into organic polymers or crosslink silicone networks.
• Slow Hydrolytic Sensitivity: Reacts slowly with water at room temperature (hydrolysis rate: ~5%/day in pure water), producing ethanol as a by-product. This controlled hydrolysis allows for manageable processing (e.g., no rapid gelation during filler treatment) but requires moisture-proof storage to prevent premature degradation.
• Thermal Stability: Stable at temperatures below 150°C; decomposes only at temperatures >280°C (producing low-toxicity siloxane oligomers, ethylene, and ethanol). This stability ensures no decomposition during high-temperature processing (e.g., plastic extrusion at 180–200°C).
• Incompatibility: Reacts violently with strong oxidizers (e.g., potassium permanganate, hydrogen peroxide) and strong acids (e.g., concentrated sulfuric acid), which may trigger uncontrolled polymerization of vinyl groups or cleavage of the Si-O-C bond. Avoid mixing with these substances.

4. Quality Standards

To meet the strict requirements of silicone synthesis and filler modification, the product adheres to rigorous industrial benchmarks:

5. Key Applications

Leveraging its dual reactivity, the compound is widely used in silicone modification, filler treatment, and polymer synthesis across industries:

5.1 Silicone Resin Production

As a core monomer for vinyl-containing silicone resins, it introduces vinyl groups into the resin backbone. These vinyl groups enable subsequent crosslinking (via peroxide or hydrosilylation), improving the resin’s:

• Thermal stability: Continuous use temperature increased by 30–50°C (up to 250–300°C).
• Mechanical strength: Tensile strength of cured resin films enhanced by 20–30%.
• Adhesion: Better bonding to metal substrates (e.g., aluminum, steel) compared to non-vinyl silicone resins.

5.2 Organic Polymer Modification

Used to "siliconize" organic polymers (e.g., polyethylene, polypropylene, epoxy resins) via free-radical polymerization or grafting reactions:

• Plastics: Improves the water repellency (contact angle of water increased from 70° to 100–110°) and impact resistance of polyolefins, making them suitable for outdoor applications (e.g., agricultural films, automotive bumpers).
• Adhesives & Sealants: Enhances the weather resistance and high-temperature performance of epoxy adhesives, extending their service life in harsh environments (e.g., aerospace, construction).

5.3 Inorganic Filler Treatment

Acts as a silane coupling agent for inorganic fillers (silica, talc, calcium carbonate) in plastics, rubbers, and coatings:

• Dispersion: Reduces filler agglomeration, improving the uniformity of composite materials (e.g., silica-reinforced rubber has more consistent hardness).
• Interfacial adhesion: Forms a "bridge" between fillers and organic matrices, increasing the tensile strength of composites by 15–25% and reducing brittleness.
• Water resistance: Blocks hydroxyl groups on filler surfaces, preventing moisture absorption and improving the dimensional stability of composites (e.g., reduced warpage of filled plastic parts).

5.4 Other Industrial Uses

• Surface Coating Additive: Added to water-based coatings (0.5–1.0% dosage) to improve scratch resistance and gloss of dried films.
• Chemical Intermediate: Used to synthesize specialty silanes (e.g., epoxy-modified dimethylsilanes) by reacting its vinyl group with other functional monomers.

6. Safety Information

7. Packaging, Storage, and Shelf Life

7.1 Packaging

• Industrial Grade: Packaged in 160L galvanized iron drums (net weight: 126 kg/drum) or 20L HDPE plastic buckets (net weight: 15.8 kg/bucket), both compliant with UN 1993 hazardous material packaging standards. Drums/buckets are sealed with Teflon gaskets to prevent moisture ingress and volatilization.
• Small Batches/Laboratory Grade: Available in 1L/5L amber glass bottles (to minimize light-induced degradation, though the compound is not highly photosensitive) with leak-proof screw caps.
• Customized Packaging: Supports customer-specific requirements (e.g., 1000L ISO tanks for bulk supply) with prior notice.

7.2 Storage

• Environmental Requirements: Store in a cool, dry, well-ventilated, explosion-proof warehouse at 0–25°C. Avoid direct sunlight, high temperatures (e.g., near heaters, boilers), and humid environments (relative humidity <50%).
• Safety Precautions:
  • Prohibit open flames, sparks, and smoking in the storage area. Install explosion-proof electrical equipment and electrostatic grounding devices.
  • Store separately from strong oxidizers, strong acids, food, and pharmaceuticals to avoid cross-contamination or hazardous reactions.
  • Use only non-sparking tools (e.g., brass hammers, plastic scoops) when handling to prevent electrostatic discharge.
• Handling Notes: Avoid transferring the product in open containers; use closed piping or grounded pumps to minimize vapor release.

7.3 Shelf Life

Under compliant packaging and storage conditions, the shelf life is 12 months from the production date. Expired products must be re-tested for purity, vinyl content, and moisture—if results meet quality standards, they can continue to be used; otherwise, they should be disposed of in accordance with local hazardous waste regulations.

8. Regulatory Compliance

• Global Standards: Complies with EU REACH Registration (No. 01-2119456243-51-XXXX) and UN GHS Hazard Communication Standards.
• Regional Compliance:
  • US: Meets EPA inert ingredient requirements for industrial additives and FDA 21 CFR §177.2600 for indirect food-contact materials.
  • China: Conforms to national standards for hazardous chemicals (GB 12268) and silane coupling agents (HG/T 4767).
• Transport Regulations: Classified as UN 1993 (Flammable Liquid, n.o.s.), adhering to IMDG Code (maritime), ADR (European road), and 49 CFR (US road) for safe transportation.