High-hardness thermoplastic polyurethane elastomer composition for waterproof moisture-permeable film and preparation method of high-hardness thermoplastic polyurethane elastomer composition

The invention relates to a high-hardness thermoplastic polyurethane elastomer composition for a waterproof and moisture-permeable film and a preparation method thereof, and the thermoplastic polyurethane elastomer composition for the waterproof and moisture-permeable film comprises a polyether type thermoplastic polyurethane elastomer and mesoporous hollow silicon dioxide immobilized organic tin, the polyether type thermoplastic polyurethane elastomer comprises a soft segment area and a hard segment area (containing carbamate groups), the mesoporous hollow silicon dioxide immobilized organic tin is concentrated in a hard segment area, and tin atoms in the mesoporous hollow silicon dioxide immobilized organic tin and the carbamate groups form coordinate bonds; the preparation method comprises the following steps: (1) uniformly mixing the mesoporous hollow silicon dioxide immobilized organic tin and the micromolecular dihydric alcohol chain extender to obtain a mixture; and (2) mixing the mixture, organic diiso