Polypropylene recycling and forming method and application of polypropylene recycling and forming method in automobile bottom guard plate processing

The invention relates to a polypropylene recycling and forming method which comprises the following steps: recycling waste non-woven fabrics, and then selecting, washing, shredding and granulating to obtain regenerated PP (polypropylene); introducing 60-90 parts of regenerated PP, 10-25 parts of new material PP, 2-5 parts of coupling agent and 1-2 parts of black master batch into a high-speed mixer, and mixing for 15 minutes; adding 0.3-0.5 part of a dispersing agent, 0.3-1 part of a main antioxidant and 0.3-1 part of an auxiliary antioxidant, and continuously mixing for 15 minutes; the resin obtained in the step S3 passes through a double-screw extruder, extrusion and grain-sized dicing are conducted, modified PP resin is obtained, the temperature of a charging barrel of the double-screw extruder is controlled to range from 180 DEG C to 220 DEG C, and the PCR-PP material for the automobile bottom protection plate is obtained. According to the invention, the regenerated plastic is fully utilized, the performa