Polypropylene automotive plastic part spraying process

Abstract

The invention provides a polypropylene automotive plastic part spraying process and relates to the technical field of spraying processing. The polypropylene automotive plastic part spraying process comprises the following steps that an area to be repaired is cleaned through white vinegar water and then cleaned up through clear water; polishing is carried out to form a bevel opening, the upper portion of the bevel opening is high, and the lower portion of the bevel opening is low; a polyolefin tackifier is sprayed and dried, the polished area to be repaired is kept as a bevel all the time, drying is carried out, and sanding and side finishing are carried out; the polyolefin tackifier is sprayed to the polished area to be repaired again for filling and leveling, the polished area to be repaired is kept as the bevel, an original paint layer on a plastic part is polished completely, and the gloss of the paint layer is removed; the polyolefin tackifier is sprayed for the third time, medium coating is sprayed after drying, flash drying is carried out, a layer of medium coating is sprayed again and scraped evenly, the polished area to be repaired is kept as the bevel, and the surface is ground flush; and acrylic paint and curing agents are diluted and mixed, and are obliquely sprayed from the upper portion to the lower portion of the spraying bevel opening after being proportionally mixed, and drying is carried out. According to the polypropylene automotive plastic part spraying process, the curing speed is high, the gravity effect is low, and the flatness of the sprayed plane is high.

Description

technical field [0001] The invention relates to the technical field of spraying processing, in particular to a spraying process for polypropylene automotive plastic parts. Background technique [0002] Powdered polypropylene is a material that is difficult to stick and paint. Therefore, when painting polypropylene parts, it must be primed with a special primer, or the surface of the parts must be specially treated before spraying acrylic paint. The most common polypropylene part used for vehicle exteriors is the bumper. In the surface treatment of polypropylene bumpers in the prior art, the curing speed of acrylic paint is slow, easy to peel off, and the area to be repaired is vertically polished. Often when spraying, it is difficult to keep the exterior smooth when spraying on the front, and due to the curing speed of the paint Slow, often under the action of gravity, the thickness of the paint in the lower part is larger, while the thickness of the upper part is smaller, ...

AI Technical Summary

Problems solved by technology

In the surface treatment of polypropylene bumpers in the prior art, the curing speed of acrylic paint is slow, easy to peel off, and the area to be repaired is vertically polished. Often when spraying, it is difficult to keep the exterior smooth when spraying on the front, and due to the curing speed of the paint Slow, often under the action of gravity, the thickness of the lower part of the paint is larger, while the thickness of the upper part is smaller, making it difficult to achieve vertical flatness of the sprayed surface