Using layer-by-layer self-assembly technology, an intelligent nano-coating was constructed on melamine foam (MF) by electrostatic interactions between chitosan (CS) molecules and graphene oxide (GO) nano-sheets. According to the principle that GO is quickly reduced to reduced GO under high temperature, a fast fire-warning network can be constructed. Due to the protective effect of nano-coating constructed on MF, the thermal stability and flame retardancy of melamine composite foams are improved. As the nano-coating self-assembly layer increases to 20, its flame-response time is only 3 s, and the continuous alarm time is as high as 1280 s. These indicate that the prepared GO-CS composite foam possesses excellent flame retardancy and super-fast fire response. This study provides a novel idea for the application of bio-based nano-coating in the fire early response and warning.
Recently, the extensive use of combustible materials has amplified building fire damage, making it essential to incorporate fire-detection devices and flame-retardant materials in building. Herein, the chitosan/gelatin (CG) film and KH 2 PO 4 -modified CG (KCG) films were fabricated via an eco-friendly water evaporation method. Impressively, KCG films demonstrate swift response times: 0.5 s at 100 °C and 1.5 s under flame, facilitating prompt alarms during fire incidents. Compared to CG, KCG achieve a 70.4% and 46.2% reduction in peak heat release rate and total heat release respectively. They also offer flexibility, transparency, repeated fire-warning efficacy and superior char formation. With these properties, KCG hold promise for innovative building fire safety solutions like smart fire-alarm wallpaper. Besides, a tailored wireless-based fire-alarm system for KCG further decreases building fire damage. This work mitigates damages arising from building fires work, marking significant leap forward in the use of bio-based materials for fire prevention in architecture.
危险品化学品经营许可证（带存储）