Methyl Hydrogen Silicone Fluid

Basic Product Information

• Product Name: Methyl hydrogen siloxane
• Appearance: Colorless to pale yellow transparent oily liquid.

TYPICAL PROPERTIES

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Physical Properties

• Low Surface Tension: Facilitates uniform film formation.
• High-Temperature Resistance: Stable from -50°C to 200°C.
• Hydrophobicity & Breathability: Combines water repellency with air permeability for balanced performance.

Chemical Properties

• Non-Toxic & Non-Irritating: Safe for human contact and industrial applications.
• Flexible Molecular Chains: Enables the formation of networked structures through cross-linking reactions, enhancing material flexibility and durability.
• ISO 10993 Biocompatibility Certified: Non-cytotoxic and non-sensitizing properties verified by in vitro/in vivo testing.
• Human Contact Safety: Suitable for prolonged human contact applications (e.g., medical devices, wearable textiles).

Product Functions

• High-Efficiency Cross-Linking Agent

Replaces traditional peroxide vulcanization, enabling byproduct- and odor-free curing.

• Performance Enhancer

Improves silicone rubber properties:

Tensile strength

Rebound resilience

Aging resistance

• Process Optimizer

Shortens vulcanization time

Reduces energy consumption

Ideal for precision molding applications

Applications

• Liquid Silicone Rubber (LSR):

Baby bottle nipples

Medical catheters

Electronic sealing components

• High-Temperature Vulcanized Silicone Rubber (HTV):

Automotive seals

Industrial cables

Keyboard keypads

• Specialty Silicones:

Conductive silicones: EMI shielding applications

Flame-retardant silicones: UL94 V0 certification

Optically transparent silicones: LED encapsulation

• Coatings & Adhesives:

Release coatings

Adhesive layers for medical dressings

Core Advantages

Market Value

Global Market Overview

Market Size

2023 Market Size: USD 850–920 million

Share of Silicone Rubber Auxiliaries Market: 35–38%

2025 Projection: USD 1.1–1.2 billion (CAGR 9–11%)

2030 Outlook: USD 1.6–1.8 billion

Technological Innovation Value

• Novel Cross-Linking Systems

Platinum-Catalyzed Addition:

Inhibitor technology (controllable induction time)

30% faster curing speed

Performance Metrics:

Tear strength ≥25 kN/m

Compression set ≤15%

• Functional Modifications

Thermal Conductivity Enhancement:

Boron nitride composites (thermal conductivity ≥1.5 W/m·K)

2025 market size: USD 250 million

Conductive Modification:

Carbon nanotube dispersion (volume resistivity: 10³–10⁶ Ω·cm)

Annual growth rate: 20–25%

• Green Production Technologies

Solvent-Free Processes:

VOC emissions ≤10 g/kg

EU REACH compliant

Bio-based Feedstocks:

30% substitution with castor oil derivatives

40% reduction in carbon footprint

Experimental Data & Case Studies

Liquid Silicone Rubber (LSR) Applications

• Experimental Data:

Tensile Strength: 10–15 MPa (ASTM D412)

Tear Strength: 25–35 kN/m

Vulcanization Time: Reduced to 30 seconds at 120°C, achieving 40% efficiency improvement vs. peroxide vulcanization.

• Case Study:

A global maternal-infant brand:

Adopted hydrogen silicone oil-vulcanized nipples, passing EN 1400 certification with 25% yield rate improvement.

High-Temperature Vulcanized Silicone Rubber (HTV) Applications

• Experimental Data:

Compression Set: <15% after 150°C × 1000h aging (ASTM D395).

• Case Study:

New energy vehicle battery pack sealing:

Hydrogen silicone oil-modified silicone passed IP67 waterproof testing, ensuring 10-year service life.

Specialty Silicone Modifications

• Conductive Silicone:Volume Resistivity: Adjustable to 10²–10⁵ Ω·cm, meeting 5G base station sealing requirements.
• Optical Silicone:Light Transmittance: >92% at 450 nm, used for camera module encapsulation.

Preparation Methods, Core Technologies & Precautions

Preparation Methods

• Step-Growth Polymerization

Raw Material Preparation:

Main components: Octamethylcyclotetrasiloxane (D4), hydrogen-containing end-capper (e.g., 1,1,3,3-tetramethyldisiloxane).

Catalyst: Tetramethylammonium silanolate.

Pre-treatment: Strict purity testing and impurity removal to meet production standards.

Polymerization Reaction:

Feed materials into a reactor in specific ratios.

Conditions: Temperature 80–120°C, controlled pressure.

Initiate polymerization with catalyst under continuous stirring to ensure uniformity.

Monitor viscosity increase during the reaction.

End-Capping Reaction:

Add end-capping agent (e.g., trimethylchlorosilane) to terminate chain growth.

Achieve controlled polymer molecular weight.

Post-Treatment:

Remove unreacted monomers, low-boiling impurities, and catalysts via vacuum distillation.

Filter to obtain purified hydrogen silicone oil.

• Emulsion Polymerization

Raw Material Preparation:

Oil phase: D4, hydrogen-containing end-capper, and emulsifier (e.g., sodium dodecyl sulfate).

Aqueous phase: Initiator solution (e.g., potassium persulfate in deionized water).

Emulsification:

Slowly add oil phase to aqueous phase under high-speed stirring.

Control stirring speed and temperature to ensure uniform emulsion droplet size.

Polymerization:

Heat emulsion to 60–80°C.

Add initiator to generate free radicals, triggering polymerization of D4 and end-capper.

Form hydrogen silicone oil emulsion.

Post-Treatment:

Demulsify, wash, and dry to convert emulsion into solid product.

Dissolve and filter to refine the final hydrogen silicone oil.

Core Technologies

• Step-Growth Polymerization

Catalyst Development:

High-activity, high-selectivity catalysts for precise control of reaction rate and molecular weight distribution.

Catalyst recycling technology to reduce costs and environmental impact.

Molecular Weight Control:

Precise adjustment via raw material ratios, temperature, reaction time, and end-capper dosage.

Target molecular weight ranges for specific silicone rubber performance.

Impurity Removal:

Advanced purification (precision distillation, adsorption filtration) to eliminate byproducts.

Ensure purity >99% and stable product quality.

• Emulsion Polymerization

Emulsion Stability Control:

Optimize emulsifier type, dosage, and process parameters to prevent phase separation.

Reaction Kinetics:

Regulate initiator dosage, temperature, and time to control polymerization rate and product structure.

Continuous Production:

Develop automated post-treatment (demulsification, drying) for higher efficiency and consistency.

Precautions

Avoid Contaminants: Sulfur, phosphorus, and amine-containing compounds (risk of Pt catalyst poisoning).

Storage: Sealed in light-proof containers below 25°C; shelf life 12 months.

Packaging & Ordering

Packaging: 200kg/1000kg plastic drums (customizable).