Manufacturing method of polymer material

A manufacturing method of a foamed polymer material, comprising:

• providing a raw material comprising polyethylene terephthalate (PET);
• performing an alcoholysis reaction by reacting the raw material with aliphatic diols to form an intermediate product, wherein the intermediate product comprises bis 2-hydroxyethyl terephthalate (BHET), and the alcoholysis reaction does not include a transesterification reaction;
• performing a polymerization reaction of the intermediate product and polytetramethylene ether glycol to obtain a thermoplastic polyester elastomer,
• mixing additives with the thermoplastic polyester elastomer to obtain a foamable masterbatch, and
• mixing the foamable masterbatch with a supercritical fluid through a supercritical fluid injection machine for injection molding to obtain the foamed polymer material,
• wherein an antioxidant is present in both of the alcoholysis reaction and the polymerization reaction,
• wherein a proportion of polymer repeating units derived from the BHET in the thermoplastic polyester elastomer is between 30 wt % and 80 wt %,
• wherein a proportion of polymer repeating units derived from the polytetramethylene ether glycol in the thermoplastic polyester elastomer is between 20 wt % and 70 wt %.