Fire retardant coatings are moving towards environmentally friendly products, and the development of green flame retardants is gradually attracting the attention of researchers. In this work, spent coffee grounds (SCG) were modified with m-xylylenediamine phosphonate ammonium (MAP) to create a bio-based flame retardant (SCG-g-MAP) for waterborne epoxy resin (WEP). The structure and composition of SCG-g-MAP were analyzed by a range of characterization tests, and the effects of SCG-g-MAP on the thermal stability, flame retardancy and fire resistance of WEP composite coatings were discussed. It revealed that WEP composite coating with 10 % SCG-g-MAP and partial conventional intumescent fire retardant fillers, resulted in a LOI value of 29.5 % and self-extinguishing capability. Moreover, the coating exhibited significantly improved fire resistance and thermal insulation properties due to its better thermal stability and excellent barrier function of forming carbon layer. This work presents a new attempt and inspiration for the application of biomass waste such as SCG for green flame retardant fillers.

中文翻译：

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咖啡渣绿色一步改性作为水性环氧树脂协同生物基阻燃剂

防火涂料正在向环保产品迈进，绿色阻燃剂的开发逐渐引起研究者的关注。在这项工作中，用间苯二甲胺膦酸铵 (MAP) 对废咖啡渣 (SCG) 进行改性，以创建用于水性环氧树脂 (WEP) 的生物基阻燃剂 (SCG-g-MAP)。通过一系列表征测试分析了SCG-g-MAP的结构和组成，并讨论了SCG-g-MAP对WEP复合涂层热稳定性、阻燃性和耐火性的影响。结果表明，含有 10% SCG-g-MAP 和部分传统膨胀型阻燃填料的 WEP 复合涂层的 LOI 值为 29.5%，并具有自熄能力。此外，由于该涂层具有更好的热稳定性和形成碳层的优异阻隔功能，因此其耐火性和隔热性能显着提高。该工作为SCG等生物质废弃物应用于绿色阻燃填料提供了新的尝试和启示。