▎ 摘　　要

NOVELTY - Antibacterial foaming polypropylene bead, which is obtained by kettle-type foaming of polypropylene-based particles. The polypropylene-based particle including a core layer and a skin layer coated on the outer side of the core layer. The core layer has a honeycomb closed cell structure. The core layer including 69.5-99.7 pts. wt. polypropylene A, 0-20 pts. wt. first antibacterial masterbatch, 0.03-0.5 pts. wt. cell nucleating agent and 0-10 pts. wt. first plastic additives. The skin layer including 20-88 pts. wt. polypropylene B, 10-50 pts. wt. second antibacterial masterbatch, 0-20 pts. wt. first antibacterial masterbatch and 0-10 pts. wt. second plastic additives and the second antibacterial master batch is composite material of two dimensional layered nano sheet and polypropylene resin. USE - Used as antibacterial foaming polypropylene bead. ADVANTAGE - The bead improves the antibacterial properties by adopting a core-shell structure of the skin layer coating core layer and antimicrobial properties and introduces second antibacterial masterbatch containing two-dimensional layered nanosheets into the skin layer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing antibacterial foaming polypropylene bead comprising (a) mixing the polypropylene A, cell nucleating agent, first antibacterial master batch, first plastic additives, double-screw extruding and granulating to obtain core layer master batch, (b) mixing the polypropylene B, second antibacterial master batch, first antibacterial master batch, second plastic additives, extruding and granulating the double screw to obtain the skin layer master batch, (c) adding the mechanical stirring and homogenizing core layer master batch and mechanical stirring and homogenizing skin layer master batch into the core layer extruder and the skin layer extruder of the double-single-screw co-extruder unit, passing through the co-extrusion port after plasticization molded wire granulation to obtain the core-shell structure polypropylene-based particle with skin layer coating the core layer and (d) subjecting the polypropylene base microparticles by kettle-type foaming of polypropylene-based particles.