Lignin, a vegetable compound, is the second most abundant biorenewable and biodegradable polymer in nature. In this study, the addition of this compound to paints containing ammonium polyphosphate (APP) and expandable graphite as pigments was investigated to improve the fire protection performance of intumescent coatings. The combination of lignin with polyaniline (PANI) in the formulations was also evaluated, as previous studies have shown that PANI-based paints show promising results in intumescent coatings. For this purpose, the thermal protection of mild steel samples coated with these organic coatings was evaluated during a fire resistance test, with the sample exposed to a Bunsen torch. During the test, temperature data and thermography images for the steel surface were collected. The coatings were also evaluated by thermogravimetric analysis and microscale combustion calorimetry. It was found that all coatings formulated provided good fire protection to the steel substrate and the lignin could be a good option to replace nonrenewable sources in intumescent paints, since the sample coated with the paint containing 10 wt% lignin reached 230°C after 30 min of assay. In addition, when this compound was used in combination with PANI, the flame protection was even better. The best performance was observed for the paint formulated with combination of 10 wt% lignin and 10 wt% PANI-ES, whose metal substrate temperature was 170°C after 30 min of assay.

木质素，一种植物化合物，是自然界中第二大最丰富的生物可再生和可生物降解的聚合物。在这项研究中，研究了将这种化合物添加到含有聚磷酸铵（APP）和可膨胀石墨作为颜料的涂料中，以改善膨胀型涂料的防火性能。木质素与聚苯胺（PANI）的组合也得到了评估，因为以前的研究表明，基于PANI的涂料在膨胀型涂料中显示出令人鼓舞的结果。为此，在耐火测试中评估了涂有这些有机涂层的低碳钢样品的热防护性能，并将样品暴露于本生火炬下。在测试过程中，收集了钢表面的温度数据和热成像图像。还通过热重分析和微尺度燃烧量热法评估了涂层。结果发现，所有配制的涂料都能为钢质基材提供良好的防火性能，木质素可能是替代膨胀型涂料中不可再生来源的好选择，因为涂有含10 wt％木质素的涂料的样品在30分钟后达到230°C。分析。此外，当该化合物与PANI结合使用时，其防火性能甚至更好。对于由10重量％的木质素和10重量％的PANI-ES组合配制的涂料，观察到最佳性能，分析30分钟后其金属基材温度为170°C。结果发现，所有配制的涂料都能为钢质基材提供良好的防火性能，木质素可能是替代膨胀型涂料中不可再生来源的好选择，因为涂有含10 wt％木质素的涂料的样品在30分钟后达到230°C。分析。此外，当该化合物与PANI结合使用时，其防火性能甚至更好。对于由10重量％的木质素和10重量％的PANI-ES组合配制的涂料，观察到最佳性能，分析30分钟后其金属基材温度为170°C。结果发现，所有配制的涂料都能为钢质基材提供良好的防火性能，木质素可能是替代膨胀型涂料中不可再生来源的好选择，因为涂有含10 wt％木质素的涂料的样品在30分钟后达到230°C。分析。此外，当该化合物与PANI结合使用时，其防火性能甚至更好。对于由10重量％的木质素和10重量％的PANI-ES组合配制的涂料，观察到最佳性能，分析30分钟后其金属基材温度为170°C。