Silicone oil is a liquid polyorganosiloxane with excellent high and low temperature resistance, chemical stability, shear resistance, viscosity-temperature characteristics and high compressibility. Vibration-absorbing products based on silicone oil are widely used in electrical and electronic equipment, high-rise buildings, bridges, and weapon platforms. A large number of related patents have been applied abroad, but domestic research in this area is still relatively small.


The damping performance of silicone oil-based damping fluid is stable in a wide range of temperature and frequency, which requires silicone oil to have a small viscosity-temperature coefficient. In order to further improve the damping performance of silicone oil, it is often necessary to add a certain amount of fillers to increase viscosity. The added fillers are required to remain in the silicone oil for a long time without sedimentation, and the viscosity of the damping fluid is required to change little within a certain shear rate range.


With the increase of temperature, the coefficient of variation of the viscosity of methyl silicone oil with high viscosity increases with the increase of viscosity. In addition, with the increase of temperature, the viscosity of methyl silicone oil changes greatly in the low temperature section, while the change in the high temperature section becomes smaller and smaller.Therefore, methyl silicone oil is a damping material suitable for use at higher temperatures. Effects of molar mass and distribution of methyl silicone oil on its viscosity-temperature properties. The viscosity-temperature coefficient of methyl silicone oil does not necessarily increase with the increase of viscosity. When the viscosity-temperature coefficient of methyl silicone oil is the same, the silicone oil with high viscosity has a wide distribution of molar mass. It is contradictory that the viscosity-temperature coefficient of methyl silicone oil increases with the increase of molar mass, but in fact, because the molar mass of general methyl silicone oil has a certain distribution, it is polydisperse, which shows that the viscosity-temperature coefficient and molar mass The distribution of mass is also related, but the relationship between viscosity-temperature coefficient and molar mass distribution needs further study. Therefore, different viscosity methyl silicone oils can be used to prepare the desired viscosity methyl silicone oil with a lower viscosity-temperature coefficient and used as the base oil of the damping fluid according to different ratios.

In order to further improve the damping performance of the damping fluid, a certain amount of thickening filler needs to be added to the methyl silicone oil. Commonly used fillers include calcium carbonate, diatomaceous earth, white carbon black and polymethylsilsesquioxane powder. Regarding the viscosity-increasing effect of non-silicon series fillers on damping fluid, ultra-fine calcium carbonate has the best viscosity-increasing effect on methyl silicone oil, which is closely related to the large specific surface area of ultra-fine calcium carbonate. However, even if superfine calcium carbonate is used as a thickening agent, when the storage time exceeds 60 days, the phenomenon of precipitation and stratification of methyl silicone oil still occurs, so these fillers are not the most suitable for thickening silicone oil.

The influence of silicon filler silica on the performance of the damping fluid. The damping performance of the damping fluid must be stable at different shear rates, which requires the viscosity of the damping fluid to change little within a certain range of shear rates. Effect of rotor speed on dynamic viscosity of damping fluid containing different silica and methyl silicone oil as base material.

Conclusion: The desired viscosity methyl silicone oil with lower viscosity-temperature coefficient can be prepared by using different viscosity methyl silicone oil, and the polymethylsilsesquioxane powder can be used to prepare the silicone oil with stable damping performance under a certain range of shear rates. damping fluid.

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