Plastic Surface Coating
The plastic coating on the surface of the plastic shell is a very important part in the production process of electric vehicles, which will directly affect the quality of the finished electric vehicles.
1. Normally, it has two different plastic coating: PU coating and UV coating.
2. The difference between PU coating and UV coating:
PU coating: flexible (soft), non-cracking, not easy to change color, and long time for color retention (freshness) (not changing color for 2-3 years, at least 2 years)
UV coating: High hardness, easy to crack, short color retention (fresh) time (no color change for 1-2 years, up to 2 years)
PU coating: It is less affected by the weather (wind, wind, rain, high temperature and other extreme weather), and no photochemical phenomenon (discoloration, cracking, shedding, etc.) will occur after a long period of high-intensity light.
UV coating: It is greatly affected by the climate. After a long period of light, the photochemical and yellowing phenomena are serious, and the paint layer is easy to come off;
Coating time for one electric motorcycle’s plastic parts: 3.5 hours for PU coating; 1.5 hours for UV coating
Unit cost: Regardless of labor cost, the single material cost PU is about ￥10 to ￥15/set higher than UV coating.
Therefore, considering the problems of water vapor and moisture in shipping, the surface coating of foreign trade vehicles usually uses PU.
3. coating steps:
Preliminary work: check and clean the surface of ABS plastic parts to ensure that the appearance is free of damage and dust.
Main four steps: coating primer--coating topcoat--decal--covering
Later work: packaging plastic parts after baking finish