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Plastic Surface Coating

2022/05/14


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:
Performance:
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)
Weather resistance:
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

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