Research Progress in the Application of Catalysts to the Degradation and Recovery of Polyurethane Waste
Mass production and use of polyurethane(PU)also brought significant waste management problems.Effective treatment and recycling measures of PU waste as well as environmental risk management is urgently needed.There is no large-scale and systematic recovery and recycling of PU waste in China,and more than 90％of them is landfilled and incinerated,resulting in land occupation,carbon emission and potential risks of air pollution.Therefore,in order to create a new model of green,low-carbon and circular development and create a"zero-waste city",recycling and resource utilization of polymer materials waste including PU has become the focus of current research and policy.Existing research and practice of PU recycling mainly focus on chemical recovery,while biological recovery is also promising.In chemical recovery,the catalyst can effectively reduce the reaction conditions,improve the decomposition rate of PU,guide and promote the recovery process of polyols and byproducts,which makes it a vital role in PU recovery.In bio-recycling,urethane enzymes of various types from bacteria or fungi are the most important reaction components in the catalytic degradation process.In this paper,the research on PU recycling in recent years was summarized from the perspective of catalysts,including chemical catalysts and biological enzymes,in order to provide reference for the selection of catalyst types and methods in PU waste recycling.
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