High resilience polyester elastomer and preparation method thereof

The present invention discloses a high resilience polyester elastomer, which comprises, by weight, 30-78% of a polyester hard segment, 20-55% of a polyether soft segment, and 0.1-15% of a polycaprolactone polyol. The preparation method comprises: adding an aromatic dicarboxylic acid or a dimethylster thereof, an aliphatic diol, a polycaprolactone polyol, and a polyether copolymer to a reaction kettle having stirring, opening stirring, heating to achieve a temperature of 180-200 DEG C, and carrying out an ester exchange reaction; and when a conversion rate of the ester exchange reaction achieves more than 90%, adjusting a vacuum degree to 100-200 Pa to carry out a condensation polymerization reaction, heating to achieve a temperature of 240-260 DEG C, and sequentially carrying out nitrogen gas filling, material discharge and pelletizing after achieving the predetermined viscosity so as to obtain the finished product. According to the present invention, the polycaprolactone polyol is introduced, and the amount of the polycaprolactone polyol is adjusted, such that the obtained elastomer has high resilience and good dynamic/static stiffness, the hardness-softness of the polyester material can be changed, processability and mechanical property of the material can be improved, and the obtained has good elasticity so as to be suitable for preparation of the gasket material used in rail traffic.