A UV-resistant PBO fiber with excellent mechanical properties and its preparation method
By regularly embedding DHPBO links into PBO fibers, the problem of strength reduction of PBO fibers under ultraviolet light was solved, and ultraviolet-resistant PBO fibers were prepared, maintaining high mechanical properties.
CN122082149APending Publication Date: 2026-05-26CHINA BLUESTAR CHENGRAND CO LTD +1
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Patent Information
- Application Number
- CN202411701809.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
PBO fibers experience a sharp decrease in strength under ultraviolet light irradiation, resulting in poor UV resistance.
Method used
UV-resistant PBO fibers were prepared by regularly embedding DHPBO segments into the molecular structure of PBO fibers, ensuring that the proportion of DHPBO segments in the modified poly(p-phenylenebenzodioxazole) fibers was less than or equal to 20%, and degassing and dry-jet wet spinning were carried out during post-polymerization and spinning processes.
Benefits of technology
Under ultraviolet light irradiation, the tensile strength of the fiber remains greater than 85%, and after 300 hours of irradiation, it still retains more than 65%, demonstrating excellent mechanical properties and UV resistance.
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Figure CN122082149A_ABST
Abstract
This application relates to the technical field of high-performance fiber production methods, providing a UV-resistant PBO fiber with excellent mechanical properties and its preparation method. The poly(p-phenylene benzodioxazole) fiber prepared by the method provided in this application has DHPBO segments regularly embedded in its molecular structure, and the proportion of DHPBO segments in the modified poly(p-phenylene benzodioxazole) fiber is less than or equal to 20%. Fibers spun from this method, with single DHPBO segments regularly embedded in the PBO macromolecule, exhibit a tensile strength at break of at least 30 cN / dtex. After irradiation for 100 hours in a dry environment at 50°C under a 340 nm UV light source, its tensile strength retention rate is still greater than 85%, and after irradiation for 300 hours, its tensile strength retention rate is still greater than 65%. Therefore, the PBO fiber prepared by the method of this application possesses excellent mechanical properties and UV resistance.
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