The so-called fully synthetic lubricant is strictly referred to as 100% PAO (poly-alpha-olefin) or synthetic ester of high-quality oil products, usually marked on the barrel of oil on the word 'synthetic'. However, from a simple understanding, the use of four types and five types of base oil blending engine oil, and without the addition of mineral oil blending can be called fully synthetic lubricants.
The advantages of synthetic lubricants
1, good low temperature performance of the synthetic oil's freezing point is generally lower than -40 °C, double ester can work below -60 °C, oxalic acid diester can work at -70 °C.
2. Good high temperature performance Because the molecular structure of synthetic oil is relatively neat, evaporation loss is small and has good thermal stability and oxidation stability, it is suitable to work under high temperature. For example, synthetic hydrocarbon, ester oil and silicon oil can be respectively 175 ~ 230 °C, 175 ~ 190 °C, 220 ~ 275 °C long-term work.
3, Good viscosity-temperature characteristics Most synthetic oils have a high viscosity index, above 145, and the viscosity is not too high at low temperatures, and the viscosity is not too low at high temperatures, so the temperature range to adapt to a wide range, such as silicone oil can be -60 ~ Long-term work at 275°C.
4, good combustion resistance Many synthetic oils have good flame resistance, such as water-glycone liquid self-ignition point is 650 °C, phosphate esters up to 700 °C, perfluoro ether is also not ignited in pure oxygen.
5, Good chemical stability Some synthetic oils are superior to mineral oils in terms of thermal stability, oxidation stability and hydrolytic stability. Perfluorocarbons and strong acids, strong alkalis, etc. do not work. The alkylbenzenes have good radiation resistance. Can resist multiple radiations.
Due to the expensive source of synthetic oil, the synthesis process is complex, the investment is high, and the wear resistance and lubricity of synthetic oil are superior to those of mineral oil. This has high application value. Therefore, the cost of synthetic oil and semi-synthetic oil Relatively high amount of mineral oil.
