Development of 3-Wet Paint System with Improved Appearance - Paint Design Based on Transfer Mechanism of Unevenness from Under Layers

Paper #:
  • 2014-01-1048

Published:
  • 2014-04-01
Citation:
Hayashi, H. and Ishii, M., "Development of 3-Wet Paint System with Improved Appearance - Paint Design Based on Transfer Mechanism of Unevenness from Under Layers," SAE Technical Paper 2014-01-1048, 2014, https://doi.org/10.4271/2014-01-1048.
Pages:
5
Abstract:
Waterborne 3-wet paint systems have been developed to reduce volatile organic compounds (VOCs) and CO2 on vehicle painting lines. However, only a small number of vehicles have adopted this system due to limitations in appearance quality (smoothness and gloss). Therefore, a waterborne 3-wet paint system with appearance quality equivalent to a conventional 3-coat 2-bake (3C2B) paint system is under development. This paper describes research for improving appearance quality. After analyzing the unevenness surface formation mechanism of a paint film, this was achieved by adopting base resins with a low glass transition point (Tg) to promote leveling, and reducing the melamine content of the paint to minimize contraction during baking.
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