Abstract Intumescent coatings are alternatives for protecting substrates against fire and can be applied externally, being exposed to inclement weather, such as solar radiation, making it necessary to know the effect of this exposure on their protective properties. This study developed benzoxazine- and epoxy-based intumescent coatings containing different types of polyhedral oligomeric silsesquioxanes (POSS), to evaluate the influence of UV aging on fire resistance properties. The coatings were formulated, applied on metallic substrates, and exposed to UV aging. Coatings without exposure to aging were also evaluated. The coatings were characterized using burning tests, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, combustion microcalorimetry and visual analysis. The char layers were characterized using optical microscopy and scanning electron microscopy. FTIR results indicated absorption bands related to functional groups typical of degradation for each resin. The burning test revealed that aging exposure decreased the fire protection of all coatings. Coatings containing POSS with nonreactive groups showed better protective properties after UV aging when compared with the ones containing reactive groups.

中文翻译：

---

含有多面体低聚倍半硅氧烷的紫外线老化膨胀涂料的防火

摘要 膨胀型涂料是保护基材免受火灾的替代品，可以在外部应用，暴露在恶劣天气（如太阳辐射）下，因此有必要了解这种暴露对其防护性能的影响。本研究开发了含有不同类型多面体低聚倍半硅氧烷 (POSS) 的苯并恶嗪基和环氧基膨胀型涂料，以评估紫外线老化对耐火性能的影响。涂料经过配制，应用于金属基材，并暴露于紫外线老化。还评估了未暴露于老化的涂层。使用燃烧试验、傅里叶变换红外光谱 (FTIR)、热重分析、燃烧微量热法和目视分析对涂层进行表征。使用光学显微镜和扫描电子显微镜表征炭层。FTIR 结果表明与每种树脂降解的典型官能团相关的吸收带。燃烧试验表明，老化暴露降低了所有涂层的防火性能。与含有反应基团的涂层相比，含有非反应基团的 POSS 涂层在紫外线老化后表现出更好的保护性能。