| Currently, the polyester fibers (PET) with large production is not only widely used in clothing,but also can be found the application in outdoor advertising light cloth, tent fabric and otherindustrial fields. From the view of saving resource and using safety, improving the durability ofPET outdoor use is one key issue. Especially, the anti-UV aging performance is an importantindex when it faces to the long-time exposure to sunlight, heat, oxidation and water. Therefore, theperformance of UV aging and anti-UV aging of Polyester fibers were investigated in our work, aswell as according to add UV absorbent method to improve the anti-UV aging properties ofpolyester fiber.Firstly, the structure and property changes of high tenacity fiber (HT-PET) and full drawnyarn (FDY-PET) were comparatively studied during the artificial accelerated aging test. Thedevelopment of mechanical performances, chemical structure, supramolecular structure andmicromorphology as function of aging time were systematically investigated. The results showedthat the stress, elongation at break of FDY-PET fibers dramatically increased, while the boilingwater shrinkage decreased with the increase of aging time, which is associated with the changes ofchemical structure, supramolecular structure and micromorphology of fibers. For chemicalstructure, the content of–COOH in FDY-PET remarkably increased and the intrinsic viscositydecreased. In terms of micromorphology of FDY-PET fibers, the mesophase was transformed toamorphous and crystalline region. Besides, the thickness of lamella and the length of fibrils werefound to increase. However, the crystal orientation as well as the orientation of fibrils decreased tosome extent. All of the above consequences are responsible to the decrease of the mechanicalproperty of FDY-PET fibers. By contrast, the mechanical properties of HT-PET fibers remainedunchanged and the boiling water shrinkage reduced slightly during the aging process, which isrelated with the perfect supramolecular structure and micromorphology, although the chemical structure decomposed and the crystal orientation decreased to some degree.In order to improve the property of anti-UV aging of Polyester fiber, the effect ofultraviolet absorbents on the structure and performance of polyester was investigated. The resultssuggested that the selected UV-1577, which could absorb ultraviolet radiation, did notdecompose in the melt process of PET, and had little influence on the spinnability of polyesterfibers. The PET fiber blended with UV-1577had higher strength retention than that of ordinaryPET fibers after300h during artificial accelerated test. Then, UV-1577was added into thepolyester system with0.5wt%by means of in-situ polymerization to make anti-UV agingpolyester industrial yarn. The result showed that UV-1577did not measurable impact on thesynthesis and solid state polycondensation of PET, as well as did not significantly effect onmaking polyester industrial yarn. The obtained anti-UV aging polyester industrial yarn had betteranti-UV aging properties than the same specification polyester industrial yarn, which withoutultraviolet absrbents added, and the strength retention was91.7%after300h during artificialfluorescent ultraviolet lamp accelerated test. In addition, the other perfect ultraviolet absorbent(OB-1) was selected for the in-situ polymerization modification of PET. It was found that theOB-1did not cause adverse influence on the synthesis and solid-state polycondensation of PETas well as the spinnability of fibers. The obtained polyester fibers by adding OB-1also hadhigher strength retention than that of ordinary polyester fibers and can retain95.6%of strengthafter300h artificial accelerated test when there was0.05wt%of OB-1in the solid-statepolycondensation of polyester chips. |
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