Carbon dioxide-based polycarbonate-polyether block polyol and preparation method thereof

The invention relates to a preparation method of carbon dioxide-based polycarbonate-polyether block polyol, which comprises the following steps: mixing an epoxy compound, a catalyst and polyether polyol to prepare a reaction system; introducing carbon dioxide into the reaction system to carry out polymerization reaction to prepare carbon dioxide-based polycarbonate-polyether block polyol; wherein the catalyst is a non-metal Lewis acid-base pair catalyst. According to the preparation method of the carbon dioxide-based polycarbonate-polyether block polyol, the non-metal Lewis acid-base is adopted to catalyze the polymerization reaction of the catalyst system, and the carbon dioxide gas is adopted as the raw material, so that the preparation method is green and environment-friendly, the post-treatment of the product is facilitated, and the problem of metal catalyst residue is avoided. The carbon dioxide based polycarbonate-polyether block polyol prepared by the preparation method of the carbon dioxide based poly