Research progress in preparation of polyether polyols by bimetallic cyanide catalysis
At present,many new catalyst systems have been developed for the synthesis of polyether polyols.In the traditional alkali-catalyzed epoxy alkane ring-opening polymerization process,a large amount of K4 is introduced,which leads to the complexity of the refining section,and increases the production cost while increasing the energy consumption.Bimetallic cyanide(DMC),as a new catalyst for the rate-opening polymerization of epoxy-alkanes,has the potential to replace traditional base catalysts due to its high efficiency and environmental protection characteristics.Therefore,DMC has become a research focus of catalysts used in the synthesis of polyether polyols.Based on this,this paper summarized in detail the catalytic mechanism of bimetallic cyanide catalyst,its application in the synthesis of polyether polyols,reaction conditions and influencing factors,and compared with traditional base catalysts,systematically expounded the advantages of bimetallic cyanide catalyst,and summarized the development direction and application fields of polyether polyols.
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