A flame retardant fabric nanocoating based on nanocarbon black particles@polymer composite and its fire-alarm application

Facile fabrication of fire-warning sensors with low-cost and high-strength has always been a considerable challenge for materials scientists. Herein, Carbon black (CB) nanoparticles with core-shell structure (denoted as [email protected]) were prepared by in-situ polymerization. And a novel fire-warning sensor (denoted as [email protected]) with temperature sensing, fire-warning, flexibility and high strength was fabricated by coating a flame retardant coating, which consists of PVA, [email protected], and Carbon nanotubes (CNT) on cotton fabric. Benefiting from the flame retardancy and carbonization performance of [email protected], [email protected] possessed much better flame retardancy and fire-warning properties. Especially, [email protected] exhibited a shorter alarm time to abnormal high temperature (350 °C) and fire, which can warn at 8 s and 4 s respectively. Meanwhile, the char length of [email protected] was 7.8 cm after the Vertical flame test (VFT) and the Total heat release rate (THR) of [email protected] was also reduced by more than 50%. Ultimately, the formation mechanism of the dense char layer and the conductive paths were also illustrated. These results show that the preparation of fire-warning sensor described in this paper has broad application prospects.