Centrifugal spinning preparation method of polyacrylonitrile-based pre-pre-oxidized fibers and carbon fibers

A polyacrylonitrile-based pre-oxidized yarn, polyacrylonitrile-based long technology, applied in fiber processing, fiber chemical characteristics, filament/thread forming, etc., can solve the limitations of large-scale application of centrifugal spinning, poor performance of carbon fiber, fiber Discontinuity and other problems, to achieve the effect of improved spinning efficiency and quality, good heat resistance and stability, and uniform diameter distribution

Active Publication Date: 2019-11-26
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional centrifugal spinning equipment usually uses ring collecting rods to collect fibers. The fibers obtained by this collection method are discontinuous short fibers, and the efficiency is low, which limits the large-scale application of centrifugal spinning in carbon fiber, and the prepared carbon fiber poor performance

Method used

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  • Centrifugal spinning preparation method of polyacrylonitrile-based pre-pre-oxidized fibers and carbon fibers
  • Centrifugal spinning preparation method of polyacrylonitrile-based pre-pre-oxidized fibers and carbon fibers
  • Centrifugal spinning preparation method of polyacrylonitrile-based pre-pre-oxidized fibers and carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A preparation method for centrifugal spinning of polyacrylonitrile-based pre-oxidized yarn, comprising the following steps:

[0056] S1. Preparation of spinning solution: dissolve the dried polyacrylonitrile powder in N,N-dimethylformamide, stir for 4 hours to dissolve completely, and then let it stand in a vacuum drying oven for 1 hour to prepare the mass concentration Be the spinning solution of 22wt%;

[0057] S2. Centrifugal spinning: The spinning solution prepared in step S1 is centrifugally spun at 60° C., the spinneret aperture is 0.16 mm, the receiving distance is 5 cm, and the spinning speed is 7000 r / min to obtain polyacrylonitrile-based long fiber;

[0058] The fiber collector of the centrifugal spinning device used in the centrifugal spinning is a flat cloth guide belt collector, and the cloth guide belt is transported and collected by guide rollers; in the spinning process, the jet is solidified into continuous filaments by heat radiation , the continuous...

Embodiment 2-7

[0066] Compared with Example 1, the centrifugal spinning preparation method of polyacrylonitrile-based pre-oxidized yarn provided by Examples 2-7 differs in that the content of PAN powder in the spinning solution is as shown in Table 1, and the others are basically the same as those in Example 1. Same, no more details here.

[0067] Table 1 embodiment 2-7 spinning solution composition

[0068] Example DMF(g) PAN(g) 2 85 15 3 82 18 4 80 20 5 79 21 6 77 23 7 75 25

[0069] Figure 5 Among them, 5-1 to 5-4 are scanning electron micrographs of the polyacrylonitrile-based long fibers prepared by centrifugal spinning in Example 1 and Example 4-6 respectively. It can be seen that with the increase of polyacrylonitrile in the spinning solution, When the concentration increases, the fiber diameter and uniformity first increase and then decrease, when the concentration is 22wt% ( Figure 5-3 ), the fiber diameter distribution is t...

Embodiment 8-13

[0071] Compared with Example 1, the centrifugal spinning preparation method of the polyacrylonitrile-based pre-oxidized yarn provided by Examples 8-13 differs in that polyvinyl butyral is added in the spinning solution, and the spinning solution composition is as follows: As shown in Table 2, the others are basically the same as in Embodiment 1, and will not be repeated here.

[0072] Table 2 embodiment 8-13 spinning solution composition

[0073] Example DMF(g) PAN(g) PVB(g) 8 77 9.2 13.8 9 77 6.9 16.1 10 77 8.05 14.95 11 75 10 15 12 80 9 11 13 85 6 9

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Abstract

The invention provides a centrifugal spinning preparation method of polyacrylonitrile-based pre-pre-oxidized fibers and carbon fibers. A prepared polyacrylonitrile-based N,N-dimethylformamide spinningsolution is injected into a plane receiving type centrifugal spinning device and jetted from a spinneret hole to a plane collecting belt under the action of centrifugal force to prepare polyacrylonitrile-based precursor fibers with relatively small diameter and uniform size distribution, then pre-oxidation is conducted through sectional heating and heat preservation, and the prepared polyacrylonitrile-based pre-oxidized fibers are high in heat resistance, good in fiber morphology and free of the adhesion phenomenon; high-temperature carbonization is carried out to obtain the polyacrylonitrile-based carbon fibers with uniform diameter distribution and good heat resistance. According to the method, polyvinyl butyral is added, so that the polyacrylonitrile-based carbon fibers of a porous structure are prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a method for preparing polyacrylonitrile-based pre-oxidized filaments and carbon fibers by centrifugal spinning. Background technique [0002] Polyacrylonitrile-based (PAN) carbon fiber is a man-made synthetic fiber. It is a brittle material with high specific strength and high modulus. It has a wide range of applications in aerospace, construction, automobile, medical and other fields. PAN-based carbon fiber is obtained by continuous pre-oxidation of PAN filaments in air to obtain pre-oxidized filaments, and then undergoes a series of heat treatments such as continuous low-temperature and high-temperature carbonization in a nitrogen atmosphere. Among them, pre-oxidized silk is an important intermediate product in the process of preparing carbon fibers. The linear molecular chain of PAN is transformed into a heat-resistant trapezoidal struc...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/21D01D5/18D01D1/09
CPCD01F9/22D01F9/21D01D5/18D01D1/09
Inventor 刘欣李晨张科徐卫林
Owner WUHAN TEXTILE UNIV
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