关键词: “湿碰湿”喷涂工艺；节能；涂装工艺；4C1B；溶解度

Abstract: In the automotive manufacturing companies, energy consumption during body production and manufacturing ranks first, prompting many domestic and international automakers to actively research new coating process. Currently, the mainstream body new coating process in many domestic and international is the four-coat-one-bake (4C1B) technique. Through case studies, this paper analyzes the quantitative relationships of solubility parameter (SP) required between paint coatings and between coatings and substrates under the 4C1B process for bodies and exterior trim parts. A quantitative analysis is conducted based on surface tension, and a qualitative analysis is performed on interlayer adhesion. Finally, the findings are validated through practical spraying operations and coating film testing. The results confirm the effectiveness of these quantitative relationships, which have been further extended to facilitate improvements in automotive body coating processes and the selection of paint and exterior trim materials.

Key words: "wet-on-wet" coating processes; energy saving; coating process; 4C1B; solubility