Foamable polypropylene composition, and foamed polypropylene and preparation method therefor

A foamable polypropylene composition, wherein the composition comprises polypropylene, a polypropylene modifier, a foaming agent, and an optional nucleating agent;

• a preparation method for the polypropylene modifier comprises:
• enabling polar monomer in formula (1) or formula (2) to be grafted with a polypropylene to obtain a polar monomer grafted polypropylene, allowing the polar monomer grafted polypropylene to be in contact with a component A to react and carrying out extruding pelletizing, wherein the polar monomer in the polar monomer grafted polypropylene is capable of chemically reacting with the component A;
• wherein the formula (1) comprises the following components:
• the polar monomer in formula (1) and the component A, wherein the polar monomer in formula (1) is at least one of maleic anhydride, acrylic acid, acrylate, methacrylic acid, methacrylate, vinyl neodecanoate, glycidyl methacrylate, dimethylamino methacrylate, epoxy acrylate, trimeric acrylic isocyanurate, and acrylamide;
• and the component A is selected from at least one of polyisocyanate and polyethylene oxide;
• wherein the formula (2) comprises the following components:
• the polar monomer in formula (2) and the component A, wherein the polar monomer in formula (2) is selected from at least one of dimethylamino methacrylate, epoxy acrylate, trimeric acrylic isocyanurate, and acrylamide;
• and the component A is selected from at least one of polyisocyanate and polyethylene oxide;
• and
• based on a total weight of the polar monomer grafted polypropylene and the component A in each formula, a dosage of the polar monomer grafted polypropylene ranges from 95 wt % to 99.8 wt %, and a dosage of the component A ranges from 0.2 wt % to 5 wt %.