Oil paint coating line-based process for coating water paint in two layers on automotive plastic exterior trimming part

Abstract

The invention discloses an oil paint coating line-based process for coating water paint in two layers on an automotive plastic exterior trimming part. In the process, to implement two-layer coating technology, an oil / water-based insulation combined system of a robot is imporved and the temperature of a base paint oven in an oil-based production line is regulated by process control of a pretreatment step and by using stable industrial propane (with a purity of more than 95 percent) as a flame treatment fuel and executing base material flame treatment experimental design, base paint spraying isavoided, water-based color paint is directly sprayed on a plastic base material, and a varnish is an oil-based varnish. After equipment improvement is completed, original oil-based paint can still beused in normal production.

Description

technical field [0001] This technology is suitable for the coating construction of car plastic exterior parts, such as bumpers, door sills, wheel covers, etc., especially car bumpers. Background technique [0002] Domestic and foreign automakers such as GM, Mercedes-Benz, BMW, Volkswagen, Brilliance, and Hyundai have different quality standards for the color exterior parts of cars. There are some differences in performance aspects such as moisture, stone impact, and appearance aspects such as color difference and gloss. In order to meet the quality standards of automobile factories, the coating production lines of domestic car exterior manufacturers all use the three-coat oil-based paint coating process to produce various colored bumpers. Oil-based paint refers to the paint with solvent as the main carrier, and some are Robotic spraying, some are manual spraying. Three-coating refers to the three-pass spraying of primer, basecoat and clearcoat on the formed plastic substra...

AI Technical Summary

Problems solved by technology

The second is the energy consumption of dealing with harmful emissions (exhaust gas is usually burned)

If the construction process of foreign water-based paint is transplanted to China, it is necessary to add a color paint oven on the existing basis. Because this transformation destroys the balance of the original system, it needs to be transformed from the process environment and the entire automatic conveying system, which has high risks and high investment. It takes a long time, and the production line that is usually in use cannot be interrupted for dozens of days for transformation

Secondly, after the transformation, the construction conditions of the original oil-based paint system will be broken, the quality risk is high, and the oil-based and water-based construction cannot be produced on the same line

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