A systematic approach was used to investigate the weathering-induced degradation of a common water–based intumescent coating. In this study, the coatings are intended for humid indoor applications on steel substrates. The coating contains ammonium polyphosphate, pentaerythritol, melamine, and polyvinyl acetate. By replacing each ingredient with a less water-soluble substance, the most vulnerable substances, polyvinyl acetate and pentaerythritol, were identified. Furthermore, the weathering resistance of the system was improved by exchanging the ingredients. The coatings were stressed by artificial weathering tests and evaluated by fire tests. Thermogravimetry and Fourier-transform infrared spectroscopy were used to study the thermal decomposition. This study lays the foundation for the development of a new generation of water-based intumescent coatings.

中文翻译：

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链条不比其最薄弱的环节强：用于钢铁应用的水性膨胀涂料的耐候性

一种系统的方法被用来研究一种常见的水基膨胀涂层的风化引起的降解。在这项研究中，涂料旨在用于钢基材上的潮湿室内应用。涂层包含多磷酸铵、季戊四醇、三聚氰胺和聚乙酸乙烯酯。通过用水溶性较差的物质代替每种成分，确定了最脆弱的物质，即聚乙酸乙烯酯和季戊四醇。此外，通过交换成分提高了体系的耐候性。涂层通过人工气候老化试验和防火试验进行评估。热重分析和傅里叶变换红外光谱被用来研究热分解。