▎ 摘　　要

NOVELTY - Polypropylene composite material comprises 30-70 pts. wt. metallocene polypropylene resin, 5-20 pts. wt. bimodal polyethylene resin, 2-15 pts. wt. modified two-dimensional layered inorganic filler, and 0.5-3 pts. wt. high-efficiency antibacterial agent. USE - As polypropylene composite material. ADVANTAGE - The polypropylene composite material has high light transmittance, hydrolysis resistance, antibacterial and mildew resistance, and exhibits synergistic effect. The composite material solves that the inherent defects of conventional antibacterial materials that are not resistant to water and have poor dimensional stability, and improves the problem of easy migration and hydrolysis failure of the antibacterial agent under complicated damp and heat conditions. The polypropylene composite material has extremely excellent antibacterial and mildew resistance performance under the harsh environment of high temperature and high humidity (95 degrees C, 100% RH) and long-term water immersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of the polypropylene composite material, involving (a) weighing the metallocene polypropylene resin and the bimodal polyethylene resin based on the above ratios, and evenly mixing them to obtain the mixed raw material (A), weighing the modified two-dimensional layered inorganic filler and high-efficiency antibacterial agent based on the above ratios, and evenly mixing them to obtain mixed raw material (B), and (b) placing the dried mixed raw material (A) in the main feed bin of a twin-screw extruder that is tightly meshed and rotating in the same direction, adding the feeding screw to the barrel of the extruder, placing the mixed raw material (B) in the side feeding bin, feeding the feed screw into the extruder from the side feeding port, where the diameter of the extruder screw is 35 mm, and the ratio of length to diameter is 48, setting the temperature of each zone of the main barrel from the feeding port to the machine head outlet to 120 degrees C, 160 degrees C, 170 degrees C, 185 degrees C, 190 degrees C, 180 degrees C and 180 degrees C, rotating the main engine at 250 rpm, and after processing such as melt extrusion, cooling, granulation, and drying to obtain the product.