The definition of lubrication: adding lubricant between two contact surfaces in relative motion, forming a lubricating film between the two friction surfaces, separating the direct contact surfaces, making dry friction become internal friction between lubricant molecules, reducing friction, Reduce wear and extend the life of mechanical equipment.
The role of lubricating oil: reduce friction, reduce wear, cooling, rust prevention, power transmission, sealing, shock absorption, cleaning.
Lubricant composition: base oil additives
Common base oils: mineral oil, synthetic base oil, vegetable oil and silicone oil.
The viscosity coefficient of silicone oil is lower than that of organic polymers with carbon chain structure mainly because the siloxane bond angle and binding energy of silicone oil molecular chains are large, the orientation freedom is large, and the flexibility is high.
Among various silicone oils, methyl silicone oil has the smallest temperature viscosity coefficient, and its viscosity changes the most with temperature. It is most suitable as the base oil of damping fluid. With the increase of temperature, the viscosity of methyl silicone oil changes greatly in the low temperature section and small changes in the high temperature section. Therefore, methyl silicone oil is a more suitable damping material for use at high temperatures.
The damping performance of silicone oil damping fluid is stable in a wide temperature and frequency range. However, in order to further improve the damping performance of silicone oil, it is necessary to add a certain amount of filler to increase its viscosity.
The silicone oil used as the base oil includes methyl phenyl silicone oil in addition to methyl silicone oil. Methyl phenyl silicone oil has high temperature, low freezing point and excellent oxidation resistance, so it is often used to synthesize high temperature grease base oil.
