Methyl silicone oil comprehensive analysis
I. Basic Properties
Chemical name: Polydimethylsiloxane (SiO)n(CH3)2(SiO)n(CH3)2, chemical formula: (SiO)n(CH3)2(SiO)n(CH3)2. Common commercial name: "201 methyl silicone oil".
Alternative names: Dimethyl silicone oil, organic silicone oil, silicone oil, etc.
CAS number: 63148-62-9 (analytical grade).
II. Chemical Properties
Hydrophobicity: Insoluble in water, but can be mixed with organic solvents such as benzene and dimethyl ether, suitable for waterproof coatings.
Thermal stability: Can be used for a long time at -50℃ to 200℃, and can withstand short-term high temperatures up to 300℃.
Chemical inertness: Resistant to acids, alkalis, oxidants, good biocompatibility, non-toxic, non-irritating.
Low surface tension: Only 20-22 mN/m, suitable for defoaming, lubrication, etc.
III. Physical Properties
Viscosity range: 0.65 to several million centipoises (cSt), can be adjusted by catalysts.
Flash point: >280℃, high safety.
Refractive index: 1.390-1.410, light transmittance up to 99.9%.
IV. Application Areas
Industrial field: Lubrication and sealing: Used in mechanical bearings, hydraulic systems to reduce friction. Release agent: Efficient release agent for rubber and plastic molds, improving production efficiency. Defoamer: Used in petroleum, pharmaceuticals, food processing for defoaming.
Consumer field: Cosmetics: As a base for emulsions, sunscreens, enhancing smoothness. Textiles: Softening treatment of fabrics, improving slipperiness and elasticity.
Special purposes: Medical: Biocompatible materials for medical catheters, dressings. Electronics: Insulation medium for transformers, capacitors.
V. Production and Processing
Raw materials: Eight-methyl-cyclosiloxane (D4) and other rings, through acid/base catalytic ring-opening polymerization.
Modification: Hydroxyl, amino modification can enhance adhesion or hydrophilicity, used for emulsified silicone oil.
VI. Safety and Storage
Storage conditions: Avoid light, ventilation, away from fire sources, stored at room temperature.
Environmental friendliness: Low toxicity, but high-temperature decomposition may release trace harmful gases, attention to ventilation is necessary.