Principle of rubber damping pad

The long coiled molecular structure of rubber and the weak secondary forces between the molecules;The long coiled molecular structure of rubber and the weak secondary forces between the molecules; The rubber material presents unique viscoelastic properties, so it has good shock absorption, sound insulation and buffering properties. Rubber components are widely used for vibration isolation and shock absorption, because of their hysteresis, damping and reversible large deformation characteristics.

The hysteresis and internal friction characteristics of rubber are usually expressed by the loss factor. The larger the loss factor, the more significant the damping and heat generation of rubber and the more obvious the shock absorption effect.

The loss factor of rubber material is not only related to the structure of rubber itself, but also related to temperature and frequency. At room temperature, the loss factor of natural rubber (NR) and butadiene rubber (BR) is small, the loss factor of styrene butadiene rubber (SBR), neoprene rubber (CR), ethylene propylene rubber (EPR), polyurethane rubber (PU) and silicone rubber is in the middle, and the loss factor of butyl rubber (HR) and nitrile butadiene rubber (NBR) is the largest.

Rubber materials used for shock absorption are generally divided into 5 kinds, namely NR, SBR, BR are ordinary rubber materials; NBR for oil resistant vulcanized rubber; CR for weather resistant vulcanized rubber; IIR for high damping vulcanized rubber; EPR is used for heat resistant vulcanized adhesives. NR, though less dissipation factor, its comprehensive performance is best, with excellent flexibility, good resistance to fatigue, low heating, creep, have with good bonding performance of the metal, cold resistance, electrical insulation and processing performance, thus NR is widely used as shock, resistance to low temperature or weather resistance, but with BR or CR and blending modification. The shock absorbers made by Nishiue et al. using NR, BR and metal salts containing OH group organic acids with carbon atom number greater than 4 have good durability, and the compression permanent deformation at 70℃×22h and 40℃×148h is 17.0% and 11.7%, respectively.