Polyurethane elastomer and preparation method thereof

The invention discloses a polyurethane elastomer and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing a dehydration product of polyether polyol with 2, 2-dimethylolpropionic acid to obtain a mixture; (2) reacting the mixture with isophorone diisocyanate to obtain an intermediate product; reacting the intermediate product with a disulfide bond-containing compound to obtain a disulfide bond-containing product; (3) enabling the product containing the disulfide bond to react with 3-methoxy-4-hydroxybenzaldehyde, so as to obtain an end-capped product; and (4) reacting the end-capped product with organic amine, and then adding an aqueous solution containing a hydrazide compound for reaction to obtain the polyurethane emulsion. The polyurethane elastomer prepared by the preparation method is relatively high in tensile strain, has multiple repair and regeneration effects and is relatively high in self-repair efficiency. 本发明公开了一种聚氨酯弹性体及其制备方法，所述制备方法包括以下步骤：(1)将聚醚多元醇的脱水产物