A facile surface phosphorylation grafting strategy to fabricate durable flame-retardant wool fabric

•Utilizing facile surface grafting to fabricate flame-retardant wool fabrics without hurting the hand attributes.•DMP covalent grafting approach shows high flame-retardant efficiency and thermal stability on wool fabric.•DMP covalent grafting approach endows the flame-retardant wool fabrics outstanding washing durability.•DMP functions through both condensed phase and gas phase action.