(1.College of Textiles, Donghua University, Shanghai 201620, China) (2.Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China)
With the rapid development of science and technology, sustainable development has become the consensus of all countries in the world. Reasonable and efficient research and development of renewable resources has become the main research direction and hotspot at home and abroad. With the increasing consumption of nylon, which plays an important role in synthetic fiber, the recycling of its waste has attracted extensive scholars-attention. This paper reviews the research status of physical recovery and chemical depolymerization of waste nylon materials at home and abroad in recent years. Several main recovery processes are introduced, including dissolution/reprecipitation in physical recovery and hydrolysis, alcoholysis, ammonolysis, ionic liquid depolymerization in chemical recovery. The advantages and disadvantages of these processes are summarized. Finally, the practical application of waste nylon recovery technology in industrial production is discussed, and it is clearly pointed out that green solvent dissolution/reprecipitation technology, ultra (sub) critical fluid depolymerization technology, solid superacid catalytic depolymerization technology and ionic liquid depolymerization technology are the key research directions in the future.