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Para-aramid fiber nanofiber membrane and preparation method thereof

A technology of para-aramid fiber and nanofiber membrane, applied in fiber processing, filament/thread forming, textile and paper making, etc., to achieve the effect of uniform thickness, high porosity and good hydrophilicity

Active Publication Date: 2020-07-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are no relevant reports on para-aramid nanofiber membranes with good structure and performance

Method used

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  • Para-aramid fiber nanofiber membrane and preparation method thereof
  • Para-aramid fiber nanofiber membrane and preparation method thereof
  • Para-aramid fiber nanofiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 7g Kevlar 49 and 7g KOH into 500ml DMSO, seal with sealant and stir magnetically at room temperature for about a week to obtain a deep red ANF suspension; during the experiment, it was found that the aramid fiber was dissolved In the process, the system presents different states in different time periods, the aramid fiber gradually dissolves, the color of the system gradually deepens, and finally turns deep red to obtain an ANF suspension;

[0041] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 25°C for 45 minutes to remove the undissolved KOH and aramid fibers in the suspension to obtain a concentration of 2.159wt% 的 ANF / DMSO solution; figure 1 This is the TEM image of the ANF / DMSO solution obtained in Example 1. In the figure, the presence of nanofibers in the ANF solution can be clearly observed, and a relatively good structural morphology is maintained; it indicates that the micron-level aramid fiber is in the DMSO...

Embodiment 2

[0046] (1) Weigh 8g Kevlar 49 and 10g KOH into 500ml DMSO, seal with sealant and stir magnetically for about a week at room temperature to obtain a deep red ANF suspension.

[0047] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 22°C for 45 minutes to remove undissolved KOH and aramid fibers in the suspension to prepare a 2.365wt% concentration ANF / DMSO solution.

[0048] (3) Dilute the 2.365wt% ANF solution obtained in step (2) to 1.5wt% concentration, and then add 1 million molecular weight PEO with the same mass as ANF, that is, the mass ratio of para-aramid fiber: PEO is 1. :1. Heat and mechanically stir in a water bath at 50°C to obtain a well-mixed spinning solution.

[0049] (4) Use a 5ml syringe with a diameter of 12.5mm to take an appropriate amount of the spinning solution of step (3), and use a needle with an inner diameter of 0.2mm and an outer diameter of 0.80mm to perform electrospinning; the electrospinning parameters are...

Embodiment 3

[0053] (1) Weigh 8g Kevlar 49 and 10g KOH into 500ml DMSO, seal with sealant and stir magnetically for about a week at room temperature to obtain a deep red ANF suspension.

[0054] (2) Centrifuge the ANF suspension in step (1) at a speed of 8000 rad / min and a temperature of 22°C for 45 minutes to remove undissolved KOH and aramid fibers in the suspension to prepare a 2.365wt% concentration ANF / DMSO solution.

[0055] (3) Dilute the 2.365wt% ANF solution obtained in step (2) to 1.5wt% concentration, and then add 1 million molecular weight PEO with the same mass as ANF, that is, the mass ratio of para-aramid fiber: PEO is 1. :1. Heat and mechanically stir in a water bath at 50°C to obtain a well-mixed spinning solution.

[0056] (4) Use a 5ml syringe with a diameter of 12.5mm to take an appropriate amount of the spinning solution of step (3), and use a needle with an inner diameter of 0.2mm and an outer diameter of 0.80mm to perform electrospinning; the electrospinning parameters are...

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Abstract

The invention relates to a para-aramid nanofiber membrane and a preparation method thereof, belonging to the field of special fiber materials. The invention provides a method for preparing a para-aramid nanofiber membrane. The preparation method is as follows: first, adding a spinning aid to a para-aramid fiber solution to obtain a uniform spinning solution, and then passing the resulting spinning solution through electrostatic The method of spinning makes para-aramid fiber membrane; Wherein, described spinning aid is a kind of in polyethylene oxide, polyvinylpyrrolidone or polyvinyl alcohol, and spinning aid and para-aramid The mass ratio of the para-aramid fiber in the fiber solution is: 10 parts by weight of the para-aramid fiber and 1-12 parts by weight of the spinning aid. The present invention successfully realizes the preparation of continuous para-aramid nanofiber membrane by electrospinning method for the first time; and by changing the collection device of electrospinning, two structural forms of random distribution and certain degree of orientation are obtained. film.

Description

Technical field [0001] The invention relates to a para-aramid nanofiber membrane and a preparation method thereof, belonging to the field of special fiber materials. Background technique [0002] The development of modern science and technology has put forward higher and higher requirements for the performance of materials. With the emergence of nanotechnology, the properties and applications of nanomaterials have become a hot topic for scholars. Nanomaterials and nanotechnology are currently one of the most promising areas for material research and transformation, and they are also the basis for the formation of a new generation of advanced fibers and composite materials. The application of micro and nanofiber structures has also become the core of many emerging industrial technologies. The micro-research will surely become the future trend. Continuous nanofibers represent a new class of nanomaterials, which have key advantages in the combination of the structure and applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D01D5/00D06C7/00
CPCD01D5/003D01D5/0076D04H1/728D06C7/00
Inventor 陈枫汤伟傅强
Owner SICHUAN UNIV
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