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A method for preparing activated carbon fibers based on centrifugal spinning method

A technology of activated carbon fiber and centrifugal spinning, applied in fiber processing, fiber chemical characteristics, filament/thread forming, etc., can solve the problems of poor activated carbon fiber performance, fiber discontinuity, low efficiency, etc., and achieve good fiber shape retention. , Not easy to melt and deform, and maintain good heat resistance

Active Publication Date: 2022-03-18
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 the fibers obtained by this collection method as discontinuous short fibers, and the efficiency is low, resulting in poor performance of the subsequent activated carbon fibers

Method used

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  • A method for preparing activated carbon fibers based on centrifugal spinning method
  • A method for preparing activated carbon fibers based on centrifugal spinning method
  • A method for preparing activated carbon fibers based on centrifugal spinning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0054] Examples 1-6 provide a method for preparing activated carbon fibers based on the centrifugal spinning method. The composition of the spinning solution is shown in Table 1, and the following steps are used to prepare:

[0055] S1. Preparation of spinning solution: dissolve the dried polyacrylonitrile powder in N,N-dimethylformamide, stir for 2-6 hours to dissolve completely, and then let it stand in a vacuum drying oven for 0.5-2 hours. Formulated into a spinning solution with a certain mass concentration;

[0056] S2. Centrifugal spinning: The spinning solution prepared in step S1 is subjected to centrifugal spinning at 60° C., wherein the spinneret aperture is 0.16 mm, the collection distance is 10 cm, and the spinning speed is 7000 r / min to obtain polyacrylonitrile Based on micro-nano long fibers;

[0057] The centrifugal spinning adopts a flat guide belt collector, and the guide belt is transported and collected by guide rollers; during the spinning process, the jet...

Embodiment 7～17

[0073] Compared with Example 2, Examples 7-17 differ in that the preparation conditions in the step S2 are shown in Table 3, and others are basically the same as Example 2, and will not be repeated here.

[0074] The preparation conditions in the step S2 of table 3 embodiment 7~17

[0075] Example Spinning aperture (mm) Collection distance (cm) Spinning temperature (℃) Spinning speed (r / min) 7 0.25 10 60 7000 8 0.64 10 60 7000 9 1 10 60 7000 10 0.16 1 60 7000 11 0.16 5 60 7000 12 0.16 8 60 7000 13 0.16 12 60 7000 14 0.16 10 40 7000 15 0.16 10 70 7000 16 0.16 10 60 3000 17 0.16 10 60 10000

[0076] The activated carbon fiber specific surface area, total pore volume and micropore pore volume test result prepared by table 4 embodiment 7~17

[0077]

[0078]

[0079] It can be seen from the test results in Table 4 that with the increase of the spinneret aperture, the...

Embodiment 18～25

[0081] Compared with Example 2, Examples 18-25 are different in that the preparation conditions in Step S3 are shown in Table 5, and the others are basically the same as Example 2, and will not be repeated here.

[0082] The preparation conditions in the step S3 of table 5 embodiment 18~25

[0083]

[0084]

[0085]The activated carbon fiber specific surface area, total pore volume and micropore pore volume test results prepared by table 6 embodiment 18~25

[0086] Example Specific surface area S BET (m 2 / g)

[0087] From the test results in Example 2 and Table 6, it can be seen that with the prolongation of the pre-oxidation holding time, the specific surface area, total pore volume, and micropore pore volume of activated carbon fibers first increase and then decrease. When step a, b, c and d in the heating and heat preservation stage, heat preservation time is respectively 20min, 20min, 20min and 120min, when, the specific surface area of ​​activated c...

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Abstract

The invention discloses a method for preparing activated carbon fibers based on a centrifugal spinning method. The configured polyacrylonitrile-based N,N-dimethylformamide spinning solution is injected into a plane receiving type centrifugal spinning device to prepare a fiber with a finer diameter. And polyacrylonitrile-based micro-nano long fibers with uniform size distribution; then pre-oxidized by segmental heating and heat preservation to obtain polyacrylonitrile-based micro-nano pre-oxidized filaments; then pre-oxidized filaments are initially carbonized at high temperatures, It can not only improve the adsorption rate of the activator during the pre-activation treatment, but also overcome the defect that the micropores collapse due to the severe carbonization process when the pre-oxidized wire is directly activated and carbonized at high temperature; High-temperature carbonization makes the activation process mild, and the micropore diameter and porosity are easy to control. The activated carbon fiber prepared by the invention has the advantages of high specific surface area, high porosity and small pore diameter, and is suitable for large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and in particular relates to a method for preparing activated carbon fibers based on a centrifugal spinning method. Background technique [0002] Activated carbon fiber is a porous carbon fiber obtained by activating a certain carbon fiber under the action of gas or chemical reagents at high temperature. It has the advantages of large specific surface area, rich microporous structure, large adsorption capacity, and easy desorption and regeneration. The third-generation product after granular activated carbon has been widely used in many fields such as gas-liquid separation, catalyst carrier and filtration. At present, the method of preparing activated carbon fibers is mainly to prepare polymer nanofibers by electrospinning, and then pre-oxidize and activate them at high temperature. As the precursor of activated carbon fiber, the performance of polymer nanofiber directly affects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F11/12D01F9/22D01D5/18
CPCD01F11/12D01F9/22D01D5/18
Inventor 刘欣李晨张科徐卫林
Owner WUHAN TEXTILE UNIV
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