Dimethyl silicone oil i.e. silicone oil.
Silicone oil, English name Silicone oil, CAS number 63148-62-9, molecular formula C6H18OSi , is a polyorganosiloxane with different polymerization degree chain structure. It is a primary polycondensation ring prepared by hydrolysis of dimethyldichlorosilane with water, and the ring body is cracked and distilled to obtain a low ring, and then the ring, head capping agent and catalyst are put together to obtain a mixture of different degrees of polymerization, and silicone oil can be prepared by vacuum distillation to remove low boiling.
Basic information
Dosage form: non-formulation: API
Drug type: Chemical
English name: Dimethicone
Molecular formula: C6H18OSi2
Product name: Silicone oil
English name: Silicone oil
Chinese aliases: silicone oil; hard foam silicone oil; homogenizer; Polysiloxanes; Methyl silicone oil; Dimethyl silicone oil; dimethicone; Dimethicone
Alias：Hard foam silicon (An even vesicant); Hard foam silicon; Methyl silicone oil ,Polydimethylsiloxane
CAS number: 63148-62-9
Molecular Formula: C6H OSi
Molecular Weight: 162.37932
Physical data
Density: 0.963
Melting point: -50°c
Refractive index: 1.403-1.406
Flash point: 300°C
WATER SOLUBILITY: PRACTICALLY INSOLUBLE
Main features
Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness 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 oxidation resistance, high flash point, low volatility, non-corrosive to metals, non-toxic, etc.
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 ethyl phenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil, cyanide-containing 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, etc.
Main uses
It is often used as high-grade lubricating oil, anti-vibration oil, insulating oil, defoamer, mold release agent, polishing agent and vacuum diffusion pump oil. Among the various silicone oils, methyl silicone oil is the most widely used and is the most important variety of silicone oil, followed by methylphenyl silicone oil. In addition, there are ethyl silicone oil, methylphenyl silicone oil, nitrile silicone oil, etc. Various functional silicone fluids and modified silicone fluids are mainly used for special Uses.
Pros and cons
Pros
(1) Excellent shear stability, has the function of absorbing vibration and preventing vibration propagation, and can be used as vibration damping fluid.
(2) Excellent thermal oxidation stability, such as thermal decomposition temperature > 300 °C, small evaporation loss (150 °C, 30 days, evaporation loss is only 2%), oxidation test (200 °C, 72h), viscosity and acid value change is small.
(3) Excellent electrical insulation, volume resistance, etc. do not change within the range of room temperature ~ 130 °C (but the oil cannot contain water).
(4) It is a non-toxic oil with low foaming and strong foam resistance, which can be used as a defoamer.
(5) The viscosity-temperature performance is the best among liquid lubricants, and the viscosity change is small in a wide temperature range. Its freezing point is generally less than -50 °C, some up to -70 °C, long-term storage at low temperature, the appearance and viscosity of its oil have no change, it is a base oil with high temperature, low temperature and wide temperature range.
Disadvantages
(1) Small surface tension (easy to leak from the machine).
(2) The solubility of gas is large (it is difficult to design a gas sealing device).
(3) The thermal expansion coefficient of silicone oil is large (may cause overpressure problems).
(4) The lubricity of silicone oil is not good, especially the lubricity of the steel friction pair.
(5) A certain hygroscopicity (after the water content is higher than 100× 10-6, the electrical properties decline sharply).
System number
CAS number: 63148-62-9
Application areas
Silicone oil has a wide range of applications, it is not only used as a special material in aviation, cutting-edge technology, military technology departments, but also used in various sectors of the national economy, and its application scope has been expanded to: construction, electronic and electrical, textile, automobile, machinery, leather and paper, chemical light industry, metal and paint, medicine and medical treatment, etc.
The main applications of silicone oil and its derivatives are: film release agent, shock absorbing oil, dielectric oil, hydraulic oil, heat transfer oil, diffusion pump oil, defoamer, lubricant, hydrophobic agent, paint additive, polishing agent, cosmetics and daily necessities additives, surfactants, granular and fiber treatment agents, silicone grease, flocculants.
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