Vinyl Terminated Silicone Fluid

Product Details

CasNo： 68083-18-1

MF： C13H30O3Si4

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information

2. Physical Properties

The physical properties of vinyl silicone oil are primarily determined by its viscosity (polymerization degree n) and vinyl content, with different specifications tailored to specific application scenarios:

3. Chemical Properties

The core characteristic is a balance of "inert main chain + reactive vinyl groups," ensuring storage stability while meeting crosslinking requirements:

1. Reactivity of Vinyl Groups
   Vinyl groups are the core functional groups. Under the action of platinum catalysts (e.g., chloroplatinic acid, platinum-vinyl siloxane complexes), they undergo hydrosilylation reactions with crosslinkers containing Si-H bonds (e.g., hydrogen-containing silicone oil), forming a three-dimensional crosslinked network. This is the core curing mechanism for addition-cure silicone rubber/silicone, with no by-products (unlike condensation-cure silicone, which releases small molecules), resulting in bubble-free products and low shrinkage (<0.1%).

2. Excellent Thermal Stability
   The bond energy of the Si-O-Si main chain is as high as 452 kJ/mol (far higher than the 347 kJ/mol of C-C bonds). Uncured vinyl silicone oil remains stable at -60–200°C for long periods; after curing (crosslinked into an elastomer), the continuous service temperature increases to 200–250°C, with short-term heat resistance up to 300°C and low thermal weight loss (<1% weight loss at 200°C for 24 hours).

3. Chemical Inertness
   Except for the crosslinking reaction of vinyl groups, the methyl groups and Si-O-Si main chain in the molecular structure are inert to weak acids, weak bases, salt solutions, and most organic solvents (e.g., petroleum ether, acetone), without hydrolysis, oxidation, or degradation. This ensures the stability of products in harsh environments (e.g., humidity, chemical corrosion).

4. Storage Stability
   When stored in a sealed, light-protected, and room-temperature (0–30°C) environment, vinyl silicone oil without added catalyst can be stably stored for 12–24 months, with no stratification, viscosity changes, or vinyl degradation. Mixing with acidic/alkaline impurities or exposure to high-temperature sunlight may cause slight siloxane chain scission, so strict storage conditions must be maintained.

4. Quality Standards

Based on the stringency of downstream applications (e.g., general industry, medical care, electronics), vinyl silicone oil is classified into multiple quality grades, with key parameter differences as follows:

Note: Medical-grade products require additional biocompatibility testing (e.g., cytotoxicity, sensitization), while electronic-grade products require ion content control (Cl⁻/Na⁺ ≤1 ppm).

5. Key Applications

As the "backbone raw material" for addition-cure silicone materials, vinyl silicone oil is widely used in high-end manufacturing, medical care, electronics, and other fields:

5.1 Addition-Cure Silicone Rubber & Liquid Silicone Rubber (LSR)

• Core Raw Material: Compound with hydrogen-containing silicone oil (crosslinker) and platinum catalyst, then cure into silicone rubber/LSR via heating (80–180°C) or room temperature. Different viscosities and vinyl contents are suitable for different products:
  • Low viscosity (100–500 cSt), high vinyl content (1.0–2.0%): Used for low-hardness (Shore 00 10–30) products such as baby bottle nipples, medical catheters, and flexible electronic encapsulation.
  • Medium-to-high viscosity (1,000–10,000 cSt), low vinyl content (0.1–0.5%): Used for high-hardness (Shore A 30–80) products such as automotive seals, mold rubber, and silicone keys.
• Advantages: No by-products during curing, low shrinkage, and stable mechanical properties (tensile strength: 3–8 MPa, elongation at break: 200–800%).

5.2 Silicone Gel

• Used in medical fields (e.g., breast implants, wound dressings) and electronic potting (e.g., LED flexible light strips, sensors): Extremely low-viscosity (50–200 cSt) vinyl silicone oil is used, combined with low-hydrogen-content crosslinkers. After curing, it forms a soft, highly elastic gel (Shore 00 5–15) with both biocompatibility and aging resistance.

5.3 Vinyl Silicone Resin

• Copolymerized with monomers such as vinyltriethoxysilane to prepare high-temperature-resistant vinyl silicone resin: Used in motor insulation varnishes and high-temperature coatings (e.g., non-stick coatings for kitchenware, engine component coatings). After curing, the resin has heat resistance up to 400°C, strong adhesion, and anti-cracking properties.

5.4 Modifiers & Additives

• Organic Polymer Modification: Blended with polyolefins (PP/PE) and epoxy resins to introduce siloxane segments, improving the polymer’s low-temperature resistance (brittleness temperature reduced by 10–20°C), impact resistance, and hydrophobicity (water contact angle increased to >110°).
• Coating/Ink Additive: Added to water-based or solvent-based coatings at 0.5–2.0% dosage to improve the coating’s leveling, scratch resistance, and weather resistance (extending outdoor service life by 5–8 years).

6. Packaging, Storage, and Transportation

6.1 Packaging Specifications

• Industrial Grade (Regular Viscosity): 200L HDPE plastic drums (net weight: 190–195 kg), 1,000L IBC totes (net weight: 950–980 kg) with sealed silicone gaskets to prevent moisture ingress and volatilization.
• High-End Grade/Medical Grade: 20L stainless steel drums (polished inner walls to avoid metal ion migration), 200L stainless steel drums; some specifications offer sterile packaging (double-sealed + EO sterilization).
• Laboratory/Small-Batch: 1L/5L transparent HDPE bottles (with leak-proof screw caps) for sampling and small-scale testing.

6.2 Storage Requirements

• Environmental Conditions: Store in a cool, dry, well-ventilated warehouse with a temperature of 0–30°C. Avoid direct sunlight, proximity to heat sources (e.g., heaters, boilers), and humid environments (relative humidity <60%).
• Safety Measures:
  • Keep away from open flames and static sources (e.g., ungrounded motors); low-viscosity grades require explosion-proof ventilation equipment.
  • Do not store with strong oxidizers (e.g., potassium permanganate) or acidic catalysts (e.g., hydrochloric acid) to avoid premature crosslinking reactions.
  • Use opened products as soon as possible; seal unused portions immediately to prevent moisture ingress and viscosity increase.

6.3 Shelf Life

• Under unopened and compliant storage conditions: 18 months for industrial grade, 12 months for high-end/medical grade.
• Expired products must be re-tested for viscosity, vinyl content, moisture, and metal impurities; they can only be used if results meet standards.

6.4 Transportation Requirements

• Non-hazardous goods (except for low-viscosity grades, most have a flash point ≥150°C, meeting general cargo transportation standards).
• Avoid severe collision and inversion during transportation to prevent drum damage and leakage; shield from sunlight during summer transportation (no insulation required in winter, as it does not solidify at low temperatures).

7. Safety and Compliance

• Toxicity: Low toxicity (oral LD₅₀ in rats >5,000 mg/kg); no skin irritation from contact, but long-term contact may cause skin degreasing. It is recommended to wear nitrile gloves and goggles during operation.
• Compliance:
  • Industrial Grade: Conforms to GB/T 30942 Vinyl-Terminated Polydimethylsiloxane and ASTM D5665 Standard for Siloxane Fluids.
  • Medical Grade: Passes USP Class VI and ISO 10993 biocompatibility tests, suitable for food-contact and medical implant products.
  • EU Export: REACH-registered, compliant with EC 1935/2004 food-contact material requirements.