PREPARATION METHOD FOR POLY(CARBONATE-ETHER)POLYOL

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Provided is a preparation method for a poly(carbonate-ether)polyol, comprising : reacting a carboxylic acid with an acidity constant of 0.2-4 with an epoxide to obtain an intermediate product, and polymerizing the intermediate product with carbon dioxide under the effect of a rare earth-doped double metal cyanide of Zn3[Co(CN)6]2 to obtain a poly(carbonate-ether)polyol. In the preparation method for a poly(carbonate-ether)polyol provided by the present invention, a carboxylic acid with an appropriate acidity constant is used as an initiator; the carboxylic acid is used to activate the epoxide; and polyethers of different molecular weights generated in situ by activation are used as chain transfer agents for participating in the polymerization of carbon dioxide and the epoxide under the effect of the rare earth-doped double metal cyanide of Zn3[Co(CN)6]2. The preparation method for a poly(carbonate-ether)polyol has a relatively short reaction time and a low content of a propylene carbonate by-product in the product.