MXene/生物基自组装材料的木材阻燃预警涂层研究

A MXene/Bio Based Self-assembled Coating for Wood Flame Retardancy and Early Warning

摘要:

针对传统阻燃技术功能单一及预警系统响应滞后的问题，本研究基于层层自组装（LbL）技术，在木材表面交替沉积壳聚糖（CS）与过渡金属碳/氮化物（MXene）作为预警层、CS与植酸（PA）作为阻燃层，构建了“阻燃-预警”双功能智能涂层。结果表明：当预警层为4层、阻燃层为5层时，涂层木材的极限氧指数提升至43.8%，热释放速率峰值降低38.7%；涂层报警响应时间缩短至8 s，预警持续时间超3 600 s，且可稳定循环报警27次。研究通过LbL技术实现了阻燃与预警功能的协同增效，为开发绿色智能木材防火材料提供了新策略。

Abstract:

To address the single-function limitation of traditional flame retardants and the delayed response of early-warning systems， a dual-functional “flame-retardant/early-warning” coating was constructed on wood surfaces using layer-by-layer self-assembly（LbL）. Positively charged chitosan（CS） and negatively charged transition metal carbide/nitride（MXene） were alternately deposited to form the early-warning layer， while CS and phytic acid（PA） constituted the flame-retardant layer. The results show that optimal performance is achieved with a 4-layer warning structure and a 5-layer flame-retardant structure. This coating increases the limiting oxygen index to 43.8% and reduces the peak heat release rate by 38.7%. The coating exhibits an 8 s alarm response time， provides continuous warning exceeding 3 600 s， and achieves stable cyclic alarm performance for 27 cycles. The LbL approach achieves synergistic flame-retardant and early-warning functions， offering a new strategy for green intelligent wood fireproofing materials.