The invention relates to an extruded and foamed
thermoplastic polyurethane elastomer particle and a preparation method thereof. The particle contains the following components in percentage by
mass: (A) 65%-90% of a
thermoplastic polyurethane elastomer, (B) 2%-30% of a
thermoplastic resin
polymer, (C) 0.5%-15% of a compatilizer and (D) 0.1%-5% of a foaming nucleating agent. The preparation method of a TPU formed particle comprises the following steps: uniformly mixing the
thermoplastic polyurethane elastomer, the thermoplastic resin
polymer, the compatilizer and the foaming nucleating agent, putting the mixture into
melt extrusion equipment, and carrying out
granulation, so as to obtain a blending
alloy particle; and putting the blending
alloy particle into foaming
extrusion equipment, carrying out melting plastification so as to obtain a melt, dissolving
supercritical carbon dioxide into the melt, foaming by virtue of a mouth mold, and carrying out
underwater dicing, so as to obtain the formed particle. The prepared
thermoplastic polyurethane foamed particle is stable in size and basically does not shrink, the surface is bright and plumy, and the diameters of foamed holes are uniform.