Wood is a sustainable biomass material, valued for its renewability and environmental friendliness. The intrinsic flammability of wood can restrict its functional applications. The application of flame retardant coatings represents an efficient strategy to enhance the fire retardancy profiles of wood. However, currently used inorganic flame retardants with organic acrylic emulsion (AE) suffer from easy caking and reduced flame retardancy. A novel organic-inorganic CaAl-AA-LDH@AE composite flame retardant coating system based on wood was developed using environmentally friendly and highly thermally stable calcium-aluminium-type layered double hydroxide (CaAl-LDH) as the flame retardant. The successful synthesis of the organic-inorganic CaAl-AA-LDH composite flame retardant was confirmed by characterisation analytical techniques. The results of the surface roughness testing demonstrated that the average values of surface roughness (Ra) and irregularity height (Rz) for the organic-inorganic composite flame retardant paint exhibited notable reductions of 57.91 % and 54.72 %, respectively, compared with the unmodified flame retardant paint. The excellent compatibility of the organic-inorganic CaAl-AA-LDH in organic acrylic coatings markedly enhances the overall aesthetic and flame retardant properties of composite flame retardant coating. The heat release rate (HRR) of the organic-inorganic composite flame-retardant coating treated wood was reduced by 56.21 % and 20.78 %, the total smoke production (TSP) was decreased by 49.69 % and 20.25 %, and the residue mass increased by 64.13 % and 16.20 %, compared to unflame retarded wood and wood treated with unmodified flame retardant coating, respect tively. The organic-inorganic CaAl-AA-LDH@AE composite flame-retardant coating exhibits favourable, compatibility and flame-retardant properties, contributing significantly to the sustainable development and application of wood-based materials.

中文翻译：

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具有优异相容性的新型有机-无机复合阻燃涂料为木材提供了卓越的阻燃性和抑烟性


木材是一种可持续的生物质材料，因其可再生性和环保性而受到重视。木材固有的可燃性会限制其功能应用。阻燃涂料的应用代表了增强木材阻燃性能的有效策略。然而，目前使用的有机丙烯酸乳液 （AE） 无机阻燃剂容易结块且阻燃性较低。以环保且热稳定的钙-铝型层状双氢氧化物 （CaAl-LDH） 为阻燃剂，开发了一种基于木材的新型有机-无机 CaAl-AA-LDH@AE复合阻燃涂料体系。表征分析技术证实了有机-无机 CaAl-AA-LDH 复合阻燃剂的成功合成。表面粗糙度测试结果表明，有机-无机复合阻燃涂料的表面粗糙度 （Ra） 和不规则高度 （Rz） 平均值与未改性阻燃涂料相比，分别显著降低了 57.91 % 和 54.72 %。有机-无机 CaAl-AA-LDH 在有机丙烯酸涂料中的出色相容性显著提高了复合阻燃涂料的整体美观性和阻燃性能。与未阻燃木材和未改性阻燃涂料处理的木材相比，有机-无机复合阻燃涂料处理木材的热释放率 （HRR） 分别降低了 56.21 % 和 20.78 %，总烟雾产生量 （TSP） 降低了 49.69 % 和 20.25 %，残留物质量分别增加了 64.13 % 和 16.20 %。 有机-无机 CaAl-AA-LDH@AE 复合阻燃涂料具有良好的相容性和阻燃性，为木质材料的可持续发展和应用做出了重大贡献。