Method for recycling waste polyurethane product

Abstract

A method for recycling waste polyurethane products. The method is as below: cutting or crushing waste polyurethane product with surface non-polyurethane attachments removed into small pieces, carrying out alcoholysis to produce a mixture of polyol and aromatic amine, and reproducing polyether polyols or polyester polyols (a mixture of aromatic amines); preparing the obtained mixture of polyol and aromatic amine, polyether polyol and polyester polyol into a combined polyether for rigid foam; and foaming to prepare a new polyurethane rigid foam. The method conducts treatment and reutilization of waste polyurethane products through alcoholysis, not only reduces the cost and increases the benefit, but also eliminates the environment pollution caused by waste polyurethane foam. The method is applicable to for the regeneration and recycling of waste polyurethane rigid foam, semi hard foam, soft foam and elastic body in the production of polyurethane products.

Description

Technical field:

[0001] The invention relates to the technical field of polyurethane, and more specifically relates to the chemical recovery and utilization method of waste polyurethane products produced in the production of polyurethane products and the like. technical background:

[0002] Traditional physical recycling methods, pyrolysis methods, and hydrolysis methods cannot fully recycle waste polyurethane products. For the recycling of polyurethane flexible foam, from the perspective of pre-production economic investment, physical recycling is better. However, the performance of the finished product is poor, and it can only be used as a low-end product. Moreover, regardless of whether it is bonded, pressurized or extruded, the foam structure of polyurethane has been damaged to a considerable extent, resulting in the reduction of mechanical properties of recycled products and being eliminated. There is currently no effective recycling method for waste from rigid polyur...

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