High-hardness thermoplastic polyurethane elastomer and preparation method thereof

The invention discloses a high-hardness thermoplastic polyurethane elastomer and a preparation method thereof. A component A comprises 16.03-26.56 parts of macromolecular dibasic alcohol, 16.03-26.56 parts of micromolecular dibasic alcohol and 46.88-67.94 parts of diisocyanate; and a component B comprises 8.34-19.02 parts of chain extender and 0.7-1 part of antioxidant, wherein the macromolecular dibasic alcohol and the micromolecular dibasic alcohol are the same in parts, the sum of the component A and the component B is 100 parts, and the mol ratio of OH groups to NCO groups is 0.98. The Shore hardness of the prepared material is 50-80D, the tensile strength IS 40-51MPa, the extension percentage is 180-410%, the tearing strength is 155-220N/mm, and the abrasion value is 44-53mm ; the surface of a molten mass at a melting temperature is smooth; and the molten mass can not be subjected to wire drawing in the compression process. The product has favorable comprehensive property and processability.