Research progress on polyurethane waste disposal and recycling technology
Polyurethane(PU),a widely used polymer with global production reaching 24.72 million tons in 2021,poses an increasing waste management challenge as its lifecycle concludes.The limitations of landfilling include the substantial land space required and the difficulty of the natural degradation of PU.Although the degradation of PU waste can be accelerated by introducing microorganisms,it is associated with high processing costs and significant implementation challenges.Incineration,used for thermal energy recovery,carries risks of secondary pollutants due to incomplete combustion.By co-incinerating PU waste in industrial kilns,the existing facilities can treat the secondary pollution of flue gas synergistically,thereby reducing the cost of flue gas treatment.Physical recycling enables full utilization but yields recycled products with compromised performance.Chemical recycling produces raw material monomers,such as polyols or other oligomers;however,it involves relatively high processing costs,challenging product separation and purification,and requires further advancement for industrial application.This review summarizes the advantages and disadvantages of various chemical recycling methods and discusses the future directions for their industrial development.
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