Polyphenylene sulfide composite melt-spun fiber with composite antioxidant dispersed in gradient manner and preparation method thereof

Abstract

The invention provides a polyphenylene sulfide composite melt-spun fiber with a composite antioxidant dispersed in a gradient manner and a preparation method thereof. Graphene and a high-temperature-resistant antioxidant are compounded through chemical grafting to prepare the composite antioxidant, and the composite antioxidant is stripped and dispersed in a PPS matrix through melt intercalation blending. The composite melt-spun fiber with the composite antioxidant with the content dispersed in the gradient manner is prepared by using a sheath-core composite spinning assembly. Compared with the prior art, the composite antioxidant has excellent thermal stability and can be uniformly dispersed in a polyphenylene sulfide fiber matrix, and the antioxidant effect can be further improved through the synergistic effect between the shielding and blocking effect of a graphene nanosheet layer in the composite antioxidant and the free radical capturing effect of the antioxidant; and aiming at the fact that the oxidation degree of the polyphenylene sulfide fiber is from deep to shallow from outside to inside, the gradient dispersion of the composite antioxidant can achieve efficient utilization of the composite antioxidant, the processing technology is simple, the cost is low, and the performance of the polyphenylene sulfide fiber can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of high-performance special fiber materials, and specifically relates to a polyphenylene sulfide composite melt-spun fiber in which a composite antioxidant is gradiently dispersed and a preparation method thereof. Background technique [0002] Polyphenylene sulfide (PPS) fiber has good chemical corrosion resistance, thermal stability, flame retardancy, dimensional stability and good processing performance. Filter bags made of PPS fiber have been widely used in coal-fired power plants, steel and Cement and other high-temperature flue gas filtration fields. [0003] However, due to the structural characteristics of PPS, there are certain defects in PPS fibers. Under high temperature and oxygen-containing conditions, the C-S bonds on the PPS macromolecular chains are prone to oxidative fracture and oxidative crosslinking, resulting in damage to the structure and performance of PPS fibers, resulting in shortened service ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the structural characteristics of PPS, there are certain defects in PPS fibers.

Under high temperature and oxygen-containing conditions, the C-S bond on the PPS macromolecular chain is easy to oxidize and break and oxidize to crosslink, resulting in damage to the structure of the PPS fiber and a decrease in performance, resulting in a shortened service life of the PPS fiber and fiber products.

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