Fire‐Retardant and High‐Temperature‐Resistant Label Paper and Its Potential Applications

Abstract A new kind of fire‐retardant and high‐temperature‐resistant hydroxyapatite (HAP) nanowire/aramid label paper has been developed, the effects of the content of HAP nanowires on the mechanical strength, high‐temperature resistance and flame‐retardant performance of the as‐prepared HAP nanowire/aramid label paper are investigated. The experimental results show that the addition of HAP nanowires can significantly improve the properties of the HAP nanowire/aramid label paper. The tensile strength, smoothness, oxygen index of the HAP nanowire/aramid label paper with a HAP/aramid weight ratio of 80/20 are 9.2 MPa, 904 s and 76.8%, respectively, significantly higher than those of the pure aramid fiber paper (3.6 MPa, 62.2 s and 27.6%), which is increased by 1.6 times, 13.5 times, and 1.8 times, respectively, indicating that the HAP nanowire/aramid label paper has superior properties over the pure aramid fiber paper. The thermal parameters characterized by the conical calorimeter indicate that the HAP nanowire/aramid label paper has excellent fire‐retardant and high‐temperature‐resistant performance. Compared with the commercial high‐temperature‐resistant label paper, which is carbonized heavily at 400 °C, the as‐prepared HAP nanowire/aramid label paper is more suitable for the application as the high‐temperature‐resistant and fire‐retardant label paper in nuclear power plants and other high‐temperature environments.