Preparation method of high-strength polyacrylonitrile nano-composite fiber

Abstract

The invention discloses a preparation method of high-strength polyacrylonitrile nano-composite fiber. The preparation method comprises the following steps: 1, feeding graphene into an organic solvent or a mixed solution of the organic solvent and water, evenly dispersing, feeding homopolymer or copolymer of acrylonitrile, and dissolving at the temperature of 30-120 DEG C to obtain a spinning solution; or directly mixing the homopolymer or copolymer of acrylonitrile with graphene, and then dispersing the mixture into concentrated acid or a water solution of inorganic salt to obtain the spinning solution; 2, filtering the spinning solution at the temperature of 20-80 DEG C, defoaming, and spraying the deformed spinning solution into a coagulating bath with the temperature of -40 to 5 DEG C by a spinneret plate to form nascent fiber; 3, extracting the nascent fiber, drying, and carrying thermal stretch and heat setting to obtain the high-strength polyacrylonitrile nano-composite fiber. The preparation method is simple in production technology, high in product performance and easy in realization of industrial mass production.

Description

technical field [0001] The invention relates to a preparation method of high-strength polyacrylonitrile nanocomposite fibers. Background technique [0002] Carbon widely exists in nature and is one of the basic elements that constitute living organisms. Graphene, as a new carbonaceous material, consists of a dense layer of carbon atoms wrapped in a honeycomb crystal lattice with sp 2 The monoatomic layer composed of hybrid connections is the basic unit of other carbon allotropes. It can be folded into zero-dimensional fullerenes, curled into one-dimensional carbon nanotubes, and stacked into three-dimensional graphite and diamonds. , has excellent crystallinity, electrical quality and excellent mechanical properties. Graphene has high strength and performance comparable to diamond. The measured tensile strength and elastic modulus are 125GPa and 1.1T Pa respectively. Graphene flakes have only one atomic layer Thick (0.335nm), only 1 / 200,000th of hair, is the thinnest and h...

AI Technical Summary

Problems solved by technology

[0005] The domestic production of polyacrylonitrile precursors for carbon fibers adopts the wet spinning method. The biggest advantage of this method is that the production process is simple, the cost of the produced carbon fibers is low, the molecular defects of the obtained PAN are small, and the emissions during the pre-oxidation process are relatively small. The thermal peak temperature is low, but the thermal draw ratio in spinning is small, and the orientation degree of PAN molecules is not high

During the pre-oxidation process, due to molecular thermal movement, deorientation will occur, resulting in poor orientation of the graphite-like sheets of the final product carbon fiber, and low tensile strength and modulus of the carbon fiber.

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