Damping rubber application
The physical meaning of damping is the attenuation of force, or the energy dissipation of an object during motion. When an object vibrates by an external force, a reaction force that attenuates the external force is generated, which is called a damping force (or a damping force). Its ratio to force is called the damping coefficient. Usually the direction of the damping force is always opposite to the speed of the movement. Therefore, the greater the damping coefficient of the material, the better the damping or damping effect.
Rubber is an ideal damping material because rubber is a macromolecular material with a large molecular volume, which causes severe internal friction under external force and produces a reaction force. In the process of resisting external vibration, this force weakens the amplitude of the vibration on the one hand, and converts it into thermal energy on the other hand, and realizes energy conversion. Rubber-based materials can be made into a variety of shock-absorbing products, such as machines, engines, vehicles, ships, shock absorbers on aircraft, and so on. Damping rubber is also widely used in vehicles, such as locomotives, shock absorbers on cars, rail cushions, bridge supports, etc. In addition, anti-vibration rubber mats are placed on the bottom of modern high-rise buildings to effectively resist earthquakes. When manufacturing damping rubber, the following two aspects should be achieved.
(1) Material selection and formulation
1 The type of rubber is selected to have side groups on the molecular structure. The steric hindrance effect can bring molecular motion resistance and increase the internal friction between the molecules, thereby increasing the damping effect, such as butyl rubber and nitrile rubber.
2 The higher vulcanization density of the vulcanization system contributes to the improvement of the damping effect.
3 The filling system uses a highly active filler material to contribute to the improvement of damping characteristics.
4 Plasticizers should not be used more.
(2) Process
1 The time of rubber mixing should not be too long.
2 The vulcanization temperature is appropriately increased, and the vulcanization time is appropriately extended to increase the crosslink density, which is advantageous for improving the damping property.
