The characteristics and principles of rubber cushions:
      Rubber is characterized by high elasticity and high viscosity. The elasticity of rubber is caused by the change of its conformational conformation. The interaction between rubber molecules will impede the movement of molecular chains, and also show the viscosity characteristics, so that stress and strain are often in an unbalanced state. The long chain molecular structure of rubber and the weaker secondary force between molecules make the rubber material exhibit unique viscoelastic properties, so it has good damping, sound insulation and cushioning properties. Rubber components are widely used to isolate vibration and absorb shock, because they have the characteristics of lag, damping, and reversible large deformation.The hysteresis and internal friction characteristics of rubber are usually expressed as loss factors. The greater the loss factor is, the more significant the damping and heat of rubber are, the more obvious the damping effect is. 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, natural rubber (NR) and butadiene rubber (BR) and the loss factor of small, styrene butadiene rubber (SBR) and chloroprene rubber (CR) and ethylene propylene rubber (EPR), polyurethane rubber (PU) silicone rubber center and the loss factor, Ding Ji rubber (HR) and nitrile rubber (NBR). The maximum loss factor. Rubber materials used for shock absorption are generally divided into 5 parts, namely, NR, SBR and BR are ordinary rubber materials, NBR is used for oil resistant vulcanizates, CR is used for weather resistant vulcanizates, IIR is used for high damping vulcanizates, EPR is used for heat resistant vulcanizates. NR although the loss factor is small, but the best overall performance, excellent flexibility, good fatigue resistance, low heat, low creep and metal bonding performance, cold resistance, electrical insulation and good machining performance. Therefore, NR is widely used as a shock to demand, resistance to low temperature or weather resistant performance can be used, and BR or CR or blending modification.The shock absorbers made by Nishiue and other metal salts containing -OH group organic acids with NR, BR and carbon atoms larger than 4 have good durability. The compression permanent deformation at 17% 22h and 40 BR 148h is 17% and 11.7%, respectively.

The application range of rubber cushions:
      The main products are rubber damping rubber damping pad, rubber air spring, rubber fender (see pictures), sponge and cork rubber cushion, an elastic joint and flexible pipe and other types For example:(1) rubber cushions. Most of them are rubber and metal composite products, with double plate, cylindrical, chip and other forms. They are used for damping and sound insulation [2] of all kinds of machinery, instruments, axles and pipelines. (2) rubber air spring. It has better shock absorption and shock resistance than metal springs, which is mainly used in vehicles. The structure is similar to the non - tube tire, with the cord layer as the pressure resistant layer, the inner rubber layer, and the protective rubber layer with oil resistance and aging resistance. (3) rubber bearing. It is made of rubber sheet and rigid material (steel plate, wire mesh and canvas). The latter can improve the compressive strength of the bearing, but it has little effect on the shear strength. Rubber bridge bearing the load to the bridge pier up, at the same time to reduce the vibration and deformation of bridge. The rubber building support can reduce the influence of the subway and the surrounding vehicles and the earthquake on the building.