The invention discloses a waste
polyurethane material recovery method and a preparation method of a
polyurethane product, and belongs to the technical field of waste
polyurethane material recovery and reutilization. The
recovery method comprises the following steps: a
powder preparation stage: crushing a waste polyurethane material by using crushing equipment to obtain polyurethane
powder; a premixed liquid
preparation stage: mixing polyurethane
powder with a degradation agent, a catalyst and a cosolvent in proportion, and uniformly mixing through stirring equipment to obtain a premixed liquid with a certain powder content; in the degradation stage, equipment with a mechanical shearing and extruding function is used for
grinding, extruding and shearing the premixed liquid, the reaction process is carried out within a set temperature range, and degradation mixed liquid of the polyurethane material is obtained after the reaction is completed. In the preparation method of the polyurethane product, a part of or all of the
polyol raw material adopts a degradation
mixed solution. According to the method, the
degradation process is low in
reagent consumption, low in temperature and short in time, does not need
gas protection, and does not generate toxic substances such as
aromatic amine, and the obtained high-performance heterogeneous polyhydric
alcohol can be directly used for preparing polyurethane products without any post-treatment process.