Dimethicone is silicone oil.
Silicone oil, the English name is Silicone oil, CAS number is 63148-62-9, molecular formula is C6H18OSi ，it is a kind of polyorganosiloxane with chain structure of different polymerization degree. The method comprises the following steps of: hydrolyzing dimethyldichlorosilane with water to obtain a primary polycondensation ring body; cracking and rectifying the ring body to obtain a low ring body; putting the ring body, a sealing agent and a catalyst together for telomerization to obtain a mixture with different polymerization degrees; and performing reduced pressure distillation to remove low boiling substances to obtain the silicone oil.
Basic Information
Dosage Form: Non-Drug Product: Drug Substance
Drug type: Chemical
English name: Dimethicone
Molecular formula: C6H18 OSi2
Product name： silicone oil
Common Name: Silicone oil
Chinese: Silicone oil; Hard foam silicone oil; Keywords foam stabilizer; polysiloxane; methyl silicone oil; Keywords dimethicone; dimethicone; dimethicone
Alias：Hard foam silicon (An even vesicant); Hard foam silicon; Methyl silicone oil ,Polydimethylsiloxane
CAS No.: 63148-62-9
Molecular formula: C6H OSi
Molecular weight: 162.37932
Physical property data
Density 0.963
Melting point-50 ° C
Refractive index 1.403-1.406
Flash point 300°C
Water soluble INSOLUBLE
Main features
Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and small surface tension, in addition to low viscosity-temperature coefficient, high compression resistance) Some varieties also have radiation resistance.
Silicone oil has many special properties, such as anti-oxidation, high flash point, low volatility, non-corrosive to metals, non-toxic and so on.
Basic classification
According to the chemical structure, it is divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen-containing silicone oil, hydroxy hydrogen-containing silicone oil, cyanogen silicone oil, etc.;
According to the use, there are damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, heat transfer oil, brake oil and so on.
Main use
Commonly used as high-grade lubricating oil, shockproof oil, insulating oil, defoamer, release agent, polishing agent and vacuum diffusion pump oil. Among all kinds of silicone oil, methyl silicone oil is the most widely used and the most important variety of silicone oil, followed by methyl phenyl silicone oil. In addition, there are ethyl silicone oil, methyl phenyl silicone oil, silicone oil containing nitrile, etc. Various functional silicone oils and modified silicone oils are mainly used for special Uses.
Advantages and disadvantages
Benefits
(1) Excellent shear stability, vibration absorption, vibration transmission prevention function, can be used as damping fluid.
(2) Excellent thermal oxidation stability, such as thermal decomposition temperature of 300℃, evaporation loss is small (150℃, 30 days, evaporation loss is only 2%), oxidation test (200℃, 72h), viscosity and acid value change is small.
(3) Excellent electrical insulation, volume resistance, etc. does not change at room temperature ~130 ° C (but the oil can not contain water).
(4) It is a non-toxic and low foaming, anti-foaming oil, can be used as a defoamer.
(5) Viscosity temperature performance is the best in liquid lubricants, and the viscosity changes little in a wide temperature range. Its freezing point is generally less than-50℃, some as high as-70℃, long-term storage at low temperature, the appearance of the oil, viscosity does not change, it is high temperature, low temperature, wide temperature range of both the base oil.
Disadvantages
(1) Small surface tension (easy to leak from the machine).
(2) The gas solubility is large (it is difficult to design a gas seal device).
(3) The thermal expansion coefficient of silicone oil is large (may cause overpressure problems).
(4) The lubricity of silicone oil is poor, especially for steel friction pairs.
(5) Certain hygroscopicity (after the water content is higher than 100×10-6, the electrical performance drops sharply)
System Number
CAS No.: 63148-62-9
Field of Application
Silicone oil is widely used, not only as a special material for aviation, cutting-edge technology, military technology sector, but also for various sectors of the national economy, its application has been expanded to: Construction, electronics, textiles, automobiles, machinery, leather and paper making, chemical and light industry, metal and paint, medicine and medical treatment, etc.
The main applications of silicone oil and its derivatives are: Release agents, shock absorption oils, dielectric oils, hydraulic oils, heat transfer oils, diffusion pump oils, defoamers, lubricants, hydrophobing agents, paint additives, polishing agents, cosmetic and household product additives, surfactants, particle and fiber treatment agents, silicone grease, flocculants.
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