Polyurethane has a variety of products, including soft and hard foams, thermoplastic elasticity and industrial products, which are widely used in automobile, household appliances, chemical industry, daily use and other fields. Recycling can be carried out separately according to the type of * * *.

(1) The recovery of flexible polyurethane foam can be mechanically recovered. (1) coating with adhesive, molding and recycling; ② Low-temperature recycling is used as filler.

(2) Recovery of reactive injection molding polyurethane ① used as glass fiber reinforced RIM-PUR filler. (2) mixing with polypropylene. Flexible PP elastomer can be made of waste RIM-PUR crushed materials and PP*** concrete. Methods: 1, activation treatment 2, adding compatilizer 3 and inorganic filler. (3) RIM-PUR recycled materials can be directly molded into various products without adding adhesive. (4) Partial thermal degradation and recycling, that is, the RIM-PUR waste is heated in a kneader to a certain extent, so that the PU molecular chain in the material is partially broken and degraded, and the material is changed from a hard plastic state to a soft plastic state, and then isocyanate is added to crosslink the degraded PU molecular chain in the material, so as to prepare a hard material, which can be used in automobile tool boxes and the like, and has high strength, high hardness and the like.