Nature-Inspired, Heat & Noise-Insulation, Highly Robust MOFs-Based Hybrid Fire-Retardant Coatings with Easy-Recycling Feature

Flexible polyurethane foams are widely used in building and vehicle interiors due to their lightweight and high resilience. However, most foams are non-biodegradable or fireproof, leading to serious white foam pollution and safety problems. Here, FPUF made of a porous MOF material loaded with flame retardant elements as a coating is reported, which realizes fire protection, isolation of heat and noise, and recovery of foam. The results show that FPUF-3 exhibited excellent fire and smoke suppression effects, and PHRR, CO production, and CO₂ production are reduced by 28.5%, 54.5%, and 21.4%, respectively. The FPUF-3 shows a longer heat preservation effect and can reduce the common noise decibel by >35%. In addition, the coating exhibits excellent stability under extreme acid–base conditions and has longer durability and effectiveness under alkaline conditions. Furthermore, the separation and recovery of FPUF and coating can be realized by ethanol solvent, and the recovery rate of coating can reach >80%, the foam still has the original high elasticity and lightweight characteristics. It provides a sustainable and practical solution for effectively improving the noise reduction, fire prevention, and heat insulation capabilities of FPUF.