Preparation technology of ultraviolet-ageing-resisting PBO (Poly-p-phenylene Benzobisoxazole) fibers

Abstract

The invention relates to the field of fiber preparation and in particular relates to a preparation technology of ultraviolet-ageing-resisting PBO (Poly-p-phenylene Benzobisoxazole) fibers with excellent mechanical properties including ultrahigh elasticity, high modulus ratio and the like. The preparation technology comprises the following steps: firstly, activating surfaces of the PBO fibers by utilizing an acid etching modifying solution and etching the surfaces to form relatively shallow grooves and fine lines; in a process of dropwise adding a weak alkaline solution to neutralize, deepeningthe relatively shallow grooves and fine lines; in a reaction process of the PBO fibers with cracks and a carbon-based suspension solution, gradually filling oxidized graphite and fine aluminum powderinto the cracks of the PBO fibers; in heat treatment in vacuum or a protection atmosphere, reducing the oxidized graphite into expanded graphite through aluminum; combining a common effect of the heat treatment to cause breaking at weak parts of the original PBO fibers with the cracks; connecting broken parts through the expanded graphite and filling; then carrying out ultraviolet-resisting modification and covering the surfaces of the fibers with one layer of uniform ultraviolet-ageing-resisting coating, so as to absorb ultraviolet light and reduce ageing, caused by the ultraviolet light, ona PBO fiber matrix.

Description

technical field [0001] The invention relates to the field of fiber preparation, in particular to a preparation process of an anti-ultraviolet aging PBO fiber with excellent mechanical properties such as ultra-high elasticity and high modulus ratio. Background technique [0002] The maximum tensile strength of poly-p-phenylene benzobisoxazole fiber (PBO fiber) is as high as 5.8GPa, and the tensile modulus is as high as 280-380GPa. It is a new type of synthetic fiber with high strength, high modulus and low density. Known as "the super fiber of the 21st century". It also has excellent heat resistance, chemical resistance and tensile properties, and is widely used in high-tech fields such as textiles and aerospace. However, PBO fibers also have obvious disadvantages, such as easy aging under light, short-term After a long time of ultraviolet light irradiation, the tensile strength of the fiber decreases rapidly, and when used in the fields of textiles and aerospace, ultraviole...

AI Technical Summary

Problems solved by technology

It also has excellent heat resistance, chemical resistance and tensile properties, and is widely used in high-tech fields such as textiles and aerospace. However, PBO fibers also have obvious disadvantages, such as easy aging under light, short-term After a long time of ultraviolet light irradiation, the tensile strength of the fiber decreases rapidly, and when used in the fields of textiles and aerospace, ultraviolet light is often irradiated, such as the sterilization process and strong ultraviolet light in the space environment, which leads to its use Extreme lifetime, severely limited applications

[0003] On February 17, 2016, the Chinese Patent Office disclosed the invention patent authorization of a preparation method of binary graft modified PBO fiber. The authorization announcement number is CN103820996B. Activation treatment, and carry out hydroxyl functional treatment on the activated PBO fiber, and then carry out APTMS grafting and surface graphene oxide binary grafting on the PBO fiber after hydroxyl functional treatment, to realize its susceptibility to atomic oxygen triggering fiber molecules However, the problem of weak anti-ultraviolet aging ability has not yet been solved.

[0004] Research on the surface modification of high-performance PBO fiber and its anti-ultraviolet performance. Journal of Functional Materials. The ability of UV aging greatly affects the performance of PBO fiber itself, which greatly weakens the high-performance advantages of PBO fiber itself, and its practicability is poor.

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