The preparation of toughening agents typically employs melt grafting or chemical modification processes. Using thermoplastic elastomers (such as POE, EPDM) as the base material, grafting reactions with monomers like maleic anhydride are carried out in a twin-screw extruder to produce functionalized toughening agents. This process introduces polar groups, significantly improving compatibility with engineering plastics (such as nylon, PBT), thereby efficiently enhancing the impact toughness of the final products.