Abstract: While automotive coatings serve protective, decorative, and other specific functions for the vehicle body, coating defects can severely compromise their performance. Paint shrinkage, as a common defect, poses significant challenges to the automotive coating industry. These challenges are primarily reflected in the extended investigation cycle required to identify the cause of shrinkage, substantial economic losses due to rework, and disruption of production schedules affecting product delivery. This paper conducts extensive on-site experiments and investigations from various aspects including the environment, materials, processes, and equipment. It outlines specific approaches and methodologies for investigating shrinkage defects. Furthermore, it identifies that silicone rubber powder from fireproof cloth can induce shrinkage and revealed the conditions under which it occurs. This discovery fills a research gap regarding the relationship between silicone rubber powder and paint shrinkage.

Key words: automotive coating; fireproof cloth; paint shrinkage; silicone rubber powder

摘要： 汽车涂层对车身兼具防护、装饰及其他特殊作用，但涂层缺陷会严重削弱其性能。漆 面缩孔作为一种常见的缺陷，对汽车涂装行业造成极大的困扰，主要体现在缩孔原因排查周 期长，缩孔导致的返修经济损失大，缩孔导致的停线打乱经营计划影响产品交付等。文章从 环境、材料、工艺、设备等方面进行了大量现场实验和排查，为缩孔的排查指出了具体的思 路和方法，同时发现了防火布的硅橡胶粉末会引起缩孔，同时揭示了其致孔的条件。该发现 将填补硅橡胶粉末与漆面缩孔关联性的研究空白。

关键词: 汽车涂层；防火布；漆面缩孔；硅橡胶粉末