Damping pad with low compression set

A damping pad with low compression set, which is prepared by a method comprising the following steps:

• (1) providing a polymer material comprising a thermoplastic ether ester elastomer, in which the polymer material has a melt flow index at 230° C. of 4 g/10 min to 18 g/10 min, Shore D hardness of 20 to 48, tensile modulus of 20 MPa to 70 MPa, density of 1.0 g/cm3 to 1.3 g/cm3, and elongation at break of 300% or more;
• (2) melting the polymer material in a first half part of a first screw barrel to obtain a molten polymer material;
• (3) adding nitrogen or carbon dioxide into the molten polymer material and homogeneously mixing in a second half part of the first screw barrel to obtain a mixture;
• (4) introducing the mixture into a second screw barrel, and turning the mixture into a supercritical state and compounding the mixture, to obtain a supercritical fluid blend;
• and
• (5) introducing the supercritical fluid blend into an injector, and injecting and molding the supercritical fluid blend to obtain the damping pad with low compression set;
• wherein the damping pad with low compression set comprises a surface layer and a foam inner layer, and the foam inner layer is covered by the surface layer;
• the thickness of the surface layer is 0.05% to 1.50% of the total thickness of the damping pad with low compression set;
• the foam inner layer comprises a plurality of pores, the pores comprised in the foam inner layer comprise a plurality of closed pores and a plurality of open pores, and the open pores are in a proportion of 50% to 90% determined according to the standard method ASTM D6226;
• and the damping pad with low compression set has Shore C hardness of 30 to 60, average density of 0.10 g/cm3 to 0.35 g/cm3, compression set of 40% or less, deceleration g value of 20 or less, and rebound resilience of 50% or more.