High-brightness black double-paint-layer spraying process for automobile exterior trimming parts

Abstract

The invention provides a high-brightness black double-paint-layer spraying process for an automobile exterior trimming part. The high-brightness black double-paint-layer spraying process is characterized by comprising the following steps that a, pretreatment is conducted, specifically, oil stains and dust on the surface of the exterior trimming part are removed; b) flame treatment: carrying out flame treatment on the to-be-painted surface of the pre-treated exterior trimming part; c) double-paint-layer spraying: firstly, a primer is used as a first-layer paint to be sprayed on the flame-treated surface of the exterior trimming part, a second-layer paint is formed by stirring and mixing 30% by mass of colored paint, 67% by mass of varnish and 3% by mass of a-OH-containing high-molecular compound, then, a-NCO-containing curing agent is added into the second-layer paint, and the second-layer paint is sprayed on the flame-treated surface of the exterior trimming part; wherein the mass ratio of the high-molecular compound containing-OH to the curing agent containing-NCO is 100: 26, and finally, the second layer of paint is sprayed to the outer surface, where the first layer of paint is sprayed, of the exterior trimming part. The produced exterior trimming part is smooth in paint surface, free of impurities and high in percent of pass.

Description

technical field [0001] The invention relates to the field of paint spraying, in particular to a high-brightness black double-layer paint spraying process for automotive exterior parts. Background technique [0002] With the gradual improvement of people's quality of life, more and more people choose to buy high-end luxury models to show their unique taste. In order to meet the needs of the market and customers, high-end luxury models often use the high-gloss "piano black" color to spray the plastic interior parts of the car. The "piano black" color has a strong vividness, excellent mirror reflection effect, and a warm touch Features such as jade, high-end yet luxurious, very popular with consumers. The color "Piano Black" is so popular that automakers have expanded the range of "Piano Black" colors. In order to attract the attention of consumers more, combined with consumer preferences, the color "piano black" is no longer exclusive to automotive interior parts, and more e...

AI Technical Summary

Problems solved by technology

[0003] Since automotive exterior parts have the characteristics of large product volume, large spraying area, complex product structure, etc., and are located outside the car, the requirements for appearance standards are higher than those of automotive interior parts. In the production of "high-gloss black" color car exterior When using parts, there are many difficulties in process technology and manufacturing, and problems such as more particles and impurities on the surface of the product and low pass rate are prone to occur.