The present invention discloses a TPU supercritical foaming material for shoe midsoles and a preparation method thereof, relating to the technical field of foaming materials. The technical key point is that the material comprises the following raw materials by weight: 40–80 parts of polyol, 20–50 parts of isocyanate, 4–12 parts of a chain extender, 0.1–30 parts of a modifier, and a supercritical gas. The method for preparing shoe midsoles using the above raw materials comprises the following steps: S1: mixing the above parts of polyol, isocyanate and chain extender, and feeding into a twin-screw extruder for blending to obtain a polymer melt; S2: preparing supercritical gas through a gas intake system, injecting the supercritical gas and polymer melt into a single-screw extruder to prepare a molten mixture containing supercritical gas; S3: injecting the molten mixture into a mold, standing and opening the mold to obtain the product.
Country Code: CN
Application Number: CN202410088184.5
