New Trends in Materials for Shock Absorbing Pads

Shock absorbers can be widely used in vehicles, ships, machinery, instrumentation, bridges, and buildings to eliminate or mitigate various adverse consequences caused by vibrations.
Traditional shock absorbers mostly use rubber, including NR SBR、BR， Oil resistant vulcanized rubber NBR, weather resistant vulcanized rubber CR, high damping vulcanized rubber IIR, heat resistant vulcanized rubber EPR. Rubber has both high elasticity and high viscosity, and its unique viscoelastic properties give it hysteresis, damping properties, large force deformation, and reversibility.
With the increasing requirements for comfort and smoothness of automobiles, the replacement of steel with plastic for lightweight, and the development of high-speed railways, as well as the increasing requirements for track and carriage damping, the selection of materials for shock absorbers is also becoming increasingly diversified.
The development history of shock absorbers in China is only over a decade, far shorter than that of rubber. But TPU materials have special characteristics.
High wear resistance, compared to the wear conditions of CS17 wheel, 1000g/wheel, 5000r/m, 23 ℃, the wear amount of various materials (mg), TPU ranges from 0.5 to 3.5 HDPE is 29, nylon 66 is 49, nylon 6 is 366, natural rubber is 146, styrene butadiene rubber is 177, butyl rubber is 205, and polybutadiene rubber is 44 The CBR is 280. The high wear resistance determines the wear life of TPU shock absorbers, which is much higher than that of rubber materials.
Wide range of hardness. By synthesizing TPU and adjusting the settings, TPU with different hardness can be produced. After the increase in hardness, The elasticity of TPU is still in good condition.
Mechanical strength: Good load-bearing capacity and impact resistance. High load-bearing capacity is particularly suitable for use as cushioning materials.
Low temperature resistance. The glass transition temperature is low. At -35 ℃. It can still maintain elasticity and flexibility. In cold environments, the effectiveness of use will not be affected by various factors.
Oil and water resistance: Shock absorbers synthesized with different formulas can achieve excellent oil or water resistance. Can be used in complex environments such as oil stains or humidity.
Good process performance. The selected material can be thermoplastic material, which can be made into cushioning materials through various methods such as injection molding, extrusion, and rolling. Good processing performance and high production efficiency. Compared to rubber, it requires mixing and vulcanization, resulting in lower production efficiency.
Good environmental friendliness. It can be recycled and reused, or biodegraded after disposal, with a circular economy and environmental friendliness.
Compared to rubber, TPU is an emerging material. Due to the many advantages mentioned above, The application of TPU in shock absorber pad materials is becoming increasingly widespread.
Editor: T