The characteristics of anti-vibration rubber mats are both high elasticity and high viscosity. The elasticity of rubber is caused by the change of its molecular conformation. The intermolecular interactions of rubber will hinder the movement of molecular chains. Stress and strain are often in an unbalanced state. The curled long-chain molecular structure of the rubber and the weak secondary forces between the molecules make the rubber material exhibit unique viscoelastic properties, thus having good shock absorption, sound insulation, and cushioning properties. Rubber parts are widely used to isolate vibrations and absorb shocks because of their hysteresis, damping, and reversible large deformation characteristics. The hysteresis and internal friction characteristics of rubber are usually expressed by loss factors. The larger the loss factor, the more significant the damping and heat generation of the rubber, and the more obvious the damping effect. The size of the rubber material loss factor is not only related to the structure of the rubber itself, but also to the temperature and frequency. At normal temperature, natural rubber (NR) and cis-butadiene rubber (BR) have smaller loss factors, styrene-butadiene rubber (SBR), neoprene (CR), ethylene-propylene rubber (EPR), polyurethane rubber (PU), and silicone rubber The loss factor is in the middle, and the loss factor of butyl rubber (HR) and nitrile rubber (NBR) is the largest. Rubber materials used for anti-vibration purposes are generally divided into 5 types, namely NR, SBR, 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 resistance Hot vulcanizate. Although NR has a small loss factor, it has the best overall performance, excellent elasticity, good fatigue resistance, low heat generation, small creep, good adhesion to metal parts, cold resistance, electrical insulation, and processing performance. Therefore, NR is widely used for shock absorption purposes. When low temperature or weather resistance is required, it can be used together with BR or CR or blended for modification. Nishiue et al. dashpot made of NR, BR and metal salts containing -OH group organic acids with a carbon number greater than 4 have good durability and compression at 70℃×22h and 40℃×148h The permanent deformation is 17.0% and 11.7% respectively.
The above information is provided by a rubber sheet manufacturer.