I'm in the automotive paint repair business. The problem is getting paint to stick to raw PP. Can someone explain to me why paint doesn't stick to PP? I know that PP has a waxy surface throughout. All feedback appreciated. Thanks..
Not familiar with specifics of PP but normally you have to adhesion activate polyolefins. Commercially flaming and electrostatics can do. They slightly oxidize surface to carboxyls to lower surface tension and provide chemical bonding sites. Frank
1st: Low surface energy of PP makes wetting hard for most liquids.
2nd: Nonpolar structure of PP reduces physical interactions with any material that gets in contact with the PP surface.
Surface energy and physical interactions can be increased by introducing polar groups by e.g. flaming or plasma treatment.
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