The role of silicone oil and true and false identification method-Iota

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News > Dynamic industry > The role of silicone oil and true and false identification method

The role of silicone oil and true and false identification method

To distinguish true and false silicone oil, we must first understand the characteristics of silicone oil, silicone oil.
Silicone oil is a different polymerization degree of chain structure of the polysiloxane, it is made of dimethyldichlorosilane water hydrolysis condensation in early ring body, ring body by cracking, distillation system, a lower ring body, then the ring body, sealing agent and catalyst on the tune poly can get all kinds of different polymerization degree of mixture, by vacuum distillation to remove the low boiling substances can silicone oil was prepared.
Silicone oil: commonly used for advanced lubricants, shock oil, insulating oil, anti foam agent, release agent, cleaning agent and vacuum diffusion pump oil, etc.. In all kinds of silicone oil, silicone oil is the most widely used, is the most important silicone oil, followed by methyl phenyl silicone oil. In addition, the ethyl silicone oil, methyl phenyl silicone oil, silicone oil, etc.. All kinds of functional silicone oil and modified silicone oil are used for special purpose.
Silicone oil characteristics: excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inert and smaller surface tension, in addition to have a low viscosity temperature coefficient, high compression resistance, and some species also have radiation resistance, no corrosion, no toxicity, etc..
True and false silicone oil discrimination:
1 with the eye observation: false oil will be more turbid, smell is relatively large, there is a bad smell;
2. The use of fire to test: with a glass rod or bar dipped in a small amount of silicone oil ignited, can ignite and take black smoke is white mineral oil, pure silicone oil ignited by fire is not burning and no smell, clear and transparent, non-toxic. Silicone oil ignition is 320 degrees.
3 freezing point test method: silicone oil in the -50 degree will not freeze the situation, false silicone oil will appear muddy or freeze.
Advantages of silicone oil:
1 excellent shear stability, absorption of vibration, to prevent the vibration of the function, can be used as shock absorber.
2. Excellent thermal oxidation stability, such as thermal decomposition temperature > 300 DEG C, small (150 DEG C, 30 days, evaporation loss is only 2%) evaporation loss, oxidation test (200 DEG C, 72h), viscosity and acid value changes.
3 excellent electrical insulation, volume resistance, etc. in the range of temperature to 130 degrees Celsius (but not water).
4 it is a non-toxic and low foaming, anti - foaming, and can be used as a foam agent.
5 viscosity temperature performance is the best liquid lubricant, in the wide temperature range of viscosity change. The pour point is generally less than - 50 DEG C, some as high as 70 DEG C, long-term storage at low temperature, there has been no change in the appearance of the oil, viscosity, it is taking into account the high temperature, low temperature, wide temperature range of base oil.
Disadvantages of silicone oil:
1 small surface tension (easy to leak from the machine).
2 gas solubility is large (difficult to design gas seal device).
3 the thermal expansion coefficient of the silicon oil is relatively large (which may cause the overpressure problem).
4 poor lubrication of silicone oil, especially for steel steel friction pair.
5 certain (after moisture absorption, water content is higher than 100 * 10-6 electrical performance dramatically)

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