The present invention proposes an ultraviolet (UV) aging-resistant high-strength and high-modulus PBO fiber and its preparation method. The strength of the PBO fiber is 31.6-32.3 cN/dtex. The strength retention rate is ≥62.5%, preferably 62.5%-90.5%. The intermittent prepolymerization process is used for the intermittent preparation of prepolymer. The material is continuously transported from the storage kettle, undergoes defoaming and pre-filtration, and then enters the final polymerization system. Before entering the final polymerization system, a UV absorber is added for blending modification. After spinning, water washing, oiling, drying, and densification treatment, UV aging-resistant fibers can be obtained. Due to the high viscosity of the PBO spinning solution, which is prone to clogging equipment and pipelines, the prepolymerization kettle, intermediate kettle, defoaming kettle, twin-screw extruder, and other equipment should be arranged compactly in spatial layout. At the same time, the reaction time and reaction temperature should be strictly controlled to ensure the intrinsic viscosity of the material in each process and maintain process stability, thereby obtaining UV aging-resistant fibers.
Country Code: CN
Application Number: CN202311137874.7
