Polypropylene composition and preparation method thereof

The invention discloses a polypropylene composition and a preparation method thereof. The polypropylene composition is prepared from the following components in parts by weight: 55 to 90 parts of polypropylene resin, 1 to 5 parts of hyperbranched polymer, 5 to 10 parts of flexibilizer, 5 to 10 parts of compatilizer, 0 to 30 parts of modified montmorillonite and 0.5 to 1 part of antioxidant. According to the polypropylene composition disclosed by the invention, the hyperbranched polymer has better adhesive property, so that by adding the hyperbranched polymer, on one hand, the adhesive property of the material can be improved, the material can be directly adhered to metal during molding, a layer of tackifier material does not need to be additionally added, the process is simplified, and the cost is saved; on the other hand, the compatibility of the filler and matrix resin can be improved, and the toughness and rigidity of the material are improved. Besides, the modified montmorillonite is adopted, so that the