A recycled polycarbonate polyol, and a method of making and using the same

By converting waste polyethylene terephthalate into recycled polycarbonate polyols through a one-pot process, the problem of relying on petroleum-based raw materials and complex processes in traditional preparation methods has been solved, enabling the production of polyurethane materials at high efficiency and low cost.

CN122325733APending Publication Date: 2026-07-03DONGHUA UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DONGHUA UNIV
Filing Date
2026-06-01
Publication Date
2026-07-03

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Abstract

This invention belongs to the field of polymer material recycling and polyurethane synthesis technology, and relates to a recycled polycarbonate polyol, its preparation method, and its application. The method includes: depolymerizing waste polyethylene terephthalate with dimethyl carbonate, adding methanol for transesterification and separating unreacted methanol, and then undergoing transesterification, separation of unreacted dimethyl carbonate, and polycondensation to obtain the recycled polycarbonate polyol. This polyol contains polyester and polycarbonate segments and is prepared by the above method. The polyol can be reacted with diisocyanate, substance X, and catalyst IV to prepare recycled polyurethane materials, where substance X is a small molecule chain extender; or, substance X is a mixture of a small molecule chain extender and water. This invention achieves a short-process upgrade and recycling of waste polyethylene terephthalate, reducing costs, and the obtained product can be directly used in polyurethane synthesis, combining environmental and economic benefits.
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Citation Information

Patent Citations

  • Curing extraction process of chemical method regenerated product dimethyl terephthalate

    CN118666683A

  • A method for recycling waste polyester textiles

    CN120119454B