High Hydrogen-Containing Silicone Oil

Product Details

CasNo： 63148-57-2

MF： C3H9OSi.(CH4OSi)n.C3H9Si

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information

2. Physical Properties

The physical properties of High H-PDMS are primarily determined by hydrogen content and viscosity, with different specifications tailored to diverse crosslinking needs (e.g., rapid curing, deep crosslinking, flexible products):

3. Chemical Properties

The core characteristic is a balance of "highly reactive Si-H bonds + stable main chain," ensuring efficient crosslinking while maintaining storage and operational safety:

3.1 Crosslinking Reactivity of Si-H Bonds

Si-H bonds are the core functional groups. Under the action of platinum catalysts (e.g., chloroplatinic acid, platinum-vinyl siloxane complexes), they rapidly undergo hydrosilylation reactions (addition reactions) with vinyl-containing siloxanes (e.g., vinyl silicone oil), releasing heat and forming a three-dimensional crosslinked network. This is the key curing mechanism for addition-cure silicone rubber, liquid silicone rubber (LSR), and silicone gel. The reaction produces no small-molecule by-products (unlike condensation-cure silicone, which releases alcohols/ketones), resulting in bubble-free products with low shrinkage (<0.1%) and stable mechanical properties.

Note: Higher hydrogen content means more Si-H bonds per unit mass of oil, leading to higher crosslink density. Typically, products crosslinked with 1.5% hydrogen content grades exhibit 20%–30% higher hardness and tensile strength than those with 0.8% hydrogen content grades.

3.2 Oxidation and Hydrolysis Stability

• Room-Temperature Stability: Si-H bonds are stable to air and water under normal storage conditions, with no significant degradation. However, at high temperatures (>150°C) or in the presence of strong oxidizers (e.g., potassium permanganate, hydrogen peroxide), Si-H bonds are easily oxidized to Si-OH (silanol groups), reducing hydrogen content and crosslinking activity. Thus, storage temperature must be strictly controlled (<30°C).
• Acid/Alkali Sensitivity: Under acidic or alkaline conditions (e.g., pH<4 or pH>10), Si-H bonds may undergo hydrolysis, generating hydrogen gas (H₂) and silanol groups. Therefore, mixing with acid/alkali impurities (e.g., unneutralized catalysts, corrosive solvents) must be avoided to prevent gassing or performance degradation.

3.3 Auxiliary Reaction Functions

Beyond crosslinking, Si-H bonds enable additional functional applications through specific reactions:

• Water Repellent Modification: Reacts with hydroxyl groups (-OH) on the surface of textiles, paper, glass, ceramics, or concrete to form a hydrophobic siloxane film, increasing water contact angles to >120° and reducing fabric water absorption by 80%–90% (e.g., waterproof outdoor clothing) or improving concrete impermeability by 1–2 grades (e.g., building exterior waterproofing).
• Defoaming: Si-H bonds disrupt liquid surface tension, inhibiting foam formation. Low-viscosity High H-PDMS (20–50 cSt) is used as an industrial defoamer in coatings, inks, and fermentation, with 30%–50% higher efficiency than ordinary dimethyl silicone oil and heat resistance up to 200°C.
• Polymer Modification: Grafts onto organic polymers with double bonds (e.g., polyethylene, polypropylene) to introduce siloxane segments, enhancing weather resistance (extending outdoor service life by 5–8 years), hydrophobicity, and high-temperature resistance.

3.4 Storage Stability

When stored in sealed, light-protected, and room-temperature (0–30°C) conditions, High H-PDMS without added catalyst can be stably stored for 6–12 months (hydrogen content degradation <5%). However, mixing with catalysts, acid/alkali impurities, or long-term exposure to high-temperature sunlight accelerates Si-H bond degradation, leading to increased viscosity and sharp drops in hydrogen content. Strict storage controls and avoidance of premature catalyst contact are therefore critical.

4. Quality Standards

Based on the stringency of downstream applications (e.g., general industry, medical care, electronics), High H-PDMS is classified into multiple quality grades, with key parameter differences directly affecting end-product performance:

Note: Medical-grade products require additional biocompatibility testing (e.g., cytotoxicity, sensitization) to avoid irritation from metal impurities (especially platinum residues). Electronic-grade products require ion content control (Cl⁻/Na⁺ ≤1 ppm) to prevent corrosion of electronic components.

5. Key Applications

As the "crosslinking core" of addition-cure silicone materials, High H-PDMS also offers modification functions, with downstream applications spanning high-end manufacturing and industrial processing:

5.1 Crosslinking Agent for Addition-Cure Silicone Rubber & LSR

• Core Application: Compound with vinyl silicone oil and platinum catalyst, then cure into silicone rubber/LSR via heating (80–180°C) or room temperature. Different hydrogen contents suit different products:
  • High hydrogen content (1.2%–1.6%): Used for high-hardness products (e.g., automotive seals, silicone keys, Shore A 50–80), improving tensile strength (up to 8 MPa) and compression set resistance (<20% at 200°C×70h).
  • Medium hydrogen content (0.8%–1.2%): Used for medium-hardness products (e.g., kitchen silicone molds, baby products, Shore A 20–50), balancing elasticity and durability.
  • Low hydrogen content (0.6%–0.8%, customized): Used for low-hardness silicone gels (e.g., medical wound dressings, LED flexible light strip potting, Shore 00 10–30), ensuring softness and breathability.

5.2 Water Repellent for Textiles & Construction Materials

• Applied to the surface of cotton, linen, polyester, glass, ceramics, and concrete: Reacts with surface hydroxyl groups to form a dense hydrophobic siloxane film, reducing fabric water absorption by 80%–90% (e.g., waterproof outdoor clothing) and improving concrete impermeability by 1–2 grades (e.g., building exterior waterproofing).
• Advantages: Long-lasting waterproof effect (maintains >80% water resistance after 20 washes) without compromising fabric breathability or material appearance.

5.3 Modifier for Organic Polymers

• Blended with polyolefins (PP/PE), epoxy resins, and polyurethanes; grafts siloxane segments via reaction with polymer double bonds:
  • Enhances weather resistance (extends outdoor service life by 5–8 years) and temperature resistance (reduces brittleness temperature by 15–25°C, increases heat distortion temperature by 20–30°C).
  • Improves hydrophobicity (water contact angle >110°), suitable for waterproof coatings and weather-resistant plastic parts (e.g., automotive exterior components).

5.4 Defoamer & Coating Additive

• Industrial Defoamer: Low-viscosity High H-PDMS (20–50 cSt) is used in coatings, inks, and fermentation industries. It eliminates foam by destabilizing foam films, with 30%–50% higher efficiency than ordinary dimethyl silicone oil and heat resistance up to 200°C.
• Coating Additive: Added to solvent-based or water-based coatings at 0.5%–1.0% dosage to improve leveling, scratch resistance (hardness increases by 1–2H), and reduce surface tension (preventing crater defects).

6. Packaging, Storage, and Transportation

6.1 Packaging Specifications

• Industrial Grade (Standard Viscosity): 200L HDPE plastic drums (net weight: 195–200 kg), 1000L IBC totes (net weight: 980–1000 kg) with nitrile rubber 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 (note: opened small packages must be used within 24 hours to prevent moisture absorption).

6.2 Storage Requirements

• Environmental Conditions: Store in a cool, dry, well-ventilated warehouse with temperature strictly controlled at 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 (low-viscosity grades have lower flash points and require explosion-proof ventilation).
  • Do not store with strong oxidizers (e.g., potassium permanganate), acids/bases (e.g., hydrochloric acid, sodium hydroxide solution), or platinum catalysts to avoid premature crosslinking or Si-H bond degradation.
  • Use opened products immediately; purge unused portions with nitrogen before resealing to prevent performance degradation from moisture/oxygen in air.

6.3 Shelf Life

• Under unopened and compliant storage conditions: 6 months for industrial grade, 3–6 months for high-end/medical grade (shorter than ordinary silicone oil due to high hydrogen content and reactivity).
• Expired products must be retested for hydrogen content, moisture, and metal impurities. They can be downgraded for use (e.g., industrial grade repurposed as defoamer) only if hydrogen content degradation ≤5% and other indicators meet standards; otherwise, use is prohibited.

6.4 Transportation Requirements

• Low-viscosity grades (e.g., 20 cSt, flash point 100–120°C) are classified as "flammable liquids" (UN 1993) and require compliance with dangerous goods transportation standards (keep away from fire, ground for static protection). Medium-to-high viscosity grades (e.g., 300 cSt, flash point ≥150°C) can be transported as general cargo.
• Avoid severe collision and inversion during transportation to prevent drum damage and leakage; shield from sunlight for temperature control (compartment temperature ≤35°C) in summer, no insulation required in winter (no solidification at low temperatures).

7. Safety and Compliance

• Toxicity: Low toxicity (oral LD₅₀ in rats >5000 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. If volatile vapors are inhaled accidentally, move to a well-ventilated area immediately.
• Compliance:
  • Industrial Grade: Conforms to GB/T 23965 Polymethylhydrosiloxane 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 (platinum residue must be ≤0.1 ppb).
  • EU Export: REACH-registered, compliant with EC 1935/2004 food-contact material requirements. Low-viscosity grades require labeling per EU CLP regulations for flammable liquids.