The role of silicone oil and the method of distinguishing true from false

Silicone oil is 1 polyorganosiloxane with different polymerization degree chain structure. It is prepared by adding water and hydrolyzing dimethyldichlorosilane to obtain primary polycondensation ring. The ring body is cracked and rectified to obtain low-ring body. Then the ring body, head sealing agent and catalyst are put together to telomerize to obtain mixtures with different polymerization degrees. Silicone oil can be prepared by removing low-boiling substances by distillation under reduced pressure.

Silicone oil features: excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness and small surface tension, in addition, it also has a low viscosity-temperature coefficient, high resistance to compression, and some varieties also have radiation resistance, no corrosion to metal, non-toxic, etc.

Silicone oil: commonly used as high-grade lubricating oil, shockproof oil, insulating oil, defoamer, release agent, polishing agent and vacuum diffusion pump oil. In all kinds of silicone oil, methyl silicone oil is the most widely used, is the most important variety of silicone oil, followed by methyl phenyl silicone oil. In addition, there are ethyl silicone oil, methyl phenyl silicone oil, nitrile-containing silicone oil and the like. Various functional silicone oils and modified silicone oils are mainly used for special purposes.

true and false silicone oil to distinguish:

1. Observe with eyes: fake silicone oil will be turbid, smell is relatively large, and there is a bad smell;
2. Use fire to test: use a glass rod or iron rod dipped in a small amount of silicone oil to ignite. White mineral oil can ignite and emit black smoke. Pure silicone oil will not burn when ignited by fire, and is odorless, clear and transparent, and non-toxic. The ignition point of silicone oil is 320 degrees.
3. Freezing point test method: silicone oil will not freeze at -50 degrees, and fake silicone oil will appear turbid or frozen.

1. Excellent shear stability, has the function of absorbing vibration and preventing vibration transmission, and can be used as a damping fluid.
2. Excellent thermal oxidation stability, such as thermal decomposition temperature> 300 ℃, small evaporation loss (150 ℃,30 days, evaporation loss is only 2%), oxidation test (200 ℃, 72h), viscosity and acid value change small.
3. Excellent electrical insulation, volume resistance, etc. does not change in the range of room temperature to 130 ℃ (but the oil cannot contain water).
It is the 1 kind of non-toxic and low foaming, anti-foaming oil, can be used as defoaming agent.
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 ℃, and some are as high as -70 ℃. After long-term storage at low temperature, the appearance and viscosity of the oil have no change. It is a base oil with high temperature, low temperature and wide temperature range.

1. The surface tension is small (easy to leak from the machine).
2. Gas solubility is large (difficult to design gas sealing device).
3. The thermal expansion coefficient of silicone oil is large (overpressure problem may occur).
4. Silicone oil has poor lubricity, especially for steel friction pairs.
5. A certain degree of hygroscopicity (after the water content is higher than 100 × 10-6, the electrical performance drops sharply)