Silicone oil is a liquid polyorganosiloxane with excellent high and low temperature resistance, chemical stability, shear resistance, viscosity-temperature characteristics and high compressibility. Vibration reduction 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 there are still few domestic researches in this area.

Silicone oil-based damping fluid has stable damping performance in a wide temperature and frequency range, 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 filler to increase the viscosity. The added filler is required to maintain long-term non-settling in the silicone oil, and the viscosity of the damping fluid is required to change little within a certain shear rate range.

As the temperature of methyl silicone oil increases, the viscosity coefficient 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, but changes less and less in the high temperature section. Therefore, methyl silicone oil is a damping material suitable for use at higher temperatures. Influence 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 molar mass distribution of the silicone oil with high viscosity is wider. 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 polydispersity, which shows that the viscosity-temperature coefficient and the molar mass The mass distribution is also related, but the relationship between the viscosity-temperature coefficient and the molar mass distribution needs further study. Therefore, methyl silicone oil with different viscosity can be used to prepare methyl silicone oil with lower viscosity-temperature coefficient as the base oil of damping fluid according to different proportions.

In order to further improve the damping performance of damping fluid, it is necessary to add a certain amount of tackifying filler to methyl silicone oil. Commonly used fillers are calcium carbonate, diatomaceous earth, silica and polymethylsilsesquioxane powder. Regarding the viscosity increasing effect of non-silicon series fillers on damping fluid, ultrafine calcium carbonate has the best viscosity increasing effect on methyl silicone oil, which is closely related to the large specific surface area of ultrafine calcium carbonate. However, even if ultrafine calcium carbonate is used as the tackifier, the methylsilicone oil will still be precipitated and delaminated after being placed for more than 60 days, so these fillers are not the most suitable for tackifying silicone oil.

The influence of silica-based filler silica on the performance of damping fluid, the damping property of damping fluid should be stable under different shear rates, which requires the viscosity of damping fluid to change little within a certain shear rate range. The effect of rotor speed on the dynamic viscosity of damping fluid containing different silica and methyl silicone oil 1 as the base material.
Conclusion: Methyl silicone oil with different viscosity can be used to prepare methyl silicone oil with lower viscosity-temperature coefficient, and polymethyl silsesquioxane powder can be used to prepare a stable damping performance under a certain range of shear rate. Damping fluid.