Low-shrinkage, low-emission and primer-free polypropylene composite material for automobile parts, and preparation method and application thereof

The invention belongs to the technical field of automobile materials, and particularly relates to a low-shrinkage, low-emission and primer-free polypropylene composite material for automobile parts, and a preparation method and an application thereof. The polypropylene composite material specifically comprises, by mass, 60-80% of a polypropylene resin, 1-20% of an elastomer, 1-10% of a porous filler, 1-20% of talcum powder, 0.1-1% of an antioxidant, 0.1-1% of a lubricant and 0.1-1% of a light stabilizer. A molecular sieve and the porous ceramic filler are added at specific positions of a screw, the filler can form uniformly distributed micropores on the surface of a base material to form physical adsorption points, the molecular sieve adsorbs paint components with small-volume molecules, and the porous ceramic mainly adsorbs paint components with large-volume molecules, so that the adhesive force of the polypropylene base material and the the paint is greatly increased. The odor and VOC level of the polypropy