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

摘要： 在汽车生产企业中，车身生产制造的能源消耗排在第一位，促使国内外很多汽车制造 企业都在主动研究涂装新工艺，目前国内外主流的车身涂装新工艺是四涂层一烘烤（4C1B） 技术。文章用实例分析了车身及其外饰件 4C1B 工艺需满足的油漆涂层间、涂层与底材间， 溶解度参数（SP）的定量关系，并用表面张力进行定量分析，且定性分析了层间结合力，最 后通过实际喷涂和漆膜检测进行验证。证明了这些定量关系的有效性，并对其进行了拓展， 有助于汽车车身喷涂工艺的改进以及油漆和外饰件材料的选型。

关键词: “湿碰湿”喷涂工艺；节能；涂装工艺；4C1B；溶解度