advantage
(1) The viscosity-temperature performance is the best among liquid lubricants, and the viscosity changes little in a wide temperature range. Its freezing point is generally less than -50°C, and some are as high as -70°C. When stored for a long time at low temperature, the appearance and viscosity of the oil will not change. It is a base oil that takes into account high temperature, low temperature and wide temperature range.
(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 changes Small.
(3) Excellent electrical insulation, volume resistance, etc. do not change in the range of normal temperature to 130 °C (but the oil cannot contain water).
(4) It is a non-toxic oil with low foaming and strong anti-foaming properties, which can be used as a defoaming agent.
(5) Excellent shear stability, has the function of absorbing vibration and preventing vibration transmission, and can be used as vibration damping fluid.
shortcoming
(1) The lubricity of silicone oil is poor, especially the lubricity of steel-steel friction pairs.
(2) The thermal expansion coefficient of silicone oil is large (may cause overpressure problems).
(3) The gas solubility is relatively large (it is difficult to design a gas sealing device).
(4) Certain hygroscopicity (after the water content is higher than 100×10-6, the electrical properties drop sharply).
(5) Small surface tension (easy to leak from the machine).
