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A method for preparing aramid nanofibers based on deprotonation of kevlar and nanofibers prepared therefrom

A technology of nanofibers and aramid fibers, applied in fiber types, fiber processing, textiles and papermaking, etc., can solve the limitations of ANF functionalization, diversified large-scale preparation and industrial production, not higher than 2.5% by weight, dispersion liquid Low concentration and other problems, to achieve the effect of accelerating the nanometerization rate, increasing the concentration, and improving the preparation efficiency

Active Publication Date: 2022-07-08
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the method still has long preparation period (2-7 days), and the problems such as the low concentration of the resulting dispersion (0.2% by weight). The deprotonation preparation method of Kevlar nanofibers from large to small, the preparation cycle of the dispersion liquid with a concentration range of 0.2-2 wt% is 2-10 days, and the concentration is not higher than 2.5 wt%; the preparation cycle The problem of long time and low reaction concentration greatly limits the functionalization, diversification, large-scale preparation and industrial production of ANF

Method used

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  • A method for preparing aramid nanofibers based on deprotonation of kevlar and nanofibers prepared therefrom
  • A method for preparing aramid nanofibers based on deprotonation of kevlar and nanofibers prepared therefrom
  • A method for preparing aramid nanofibers based on deprotonation of kevlar and nanofibers prepared therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) 6g Kevlar chopped fibers (about 12-20 microns in diameter, 6 mm in length, purchased from DuPont), 500 ml of dimethyl sulfoxide (DMSO), and 1 g of KOH were added to the reaction vessel. Under the rotating speed of 4000 rpm of the shear dispersing machine, the pretreatment was stirred for 5 min to obtain a light yellow uniform dispersion of macro aramid fibers.

[0042] (2) A solution of 18g deionized water and 2g KOH was added to the pre-dispersion in step (1) at one time to obtain a mixed solution, and the speed was adjusted to continue stirring for 1 h to obtain a black-red uniform transparent aramid nanofiber colloidal dispersion. figure 2 The SEM image of the aramid nanofibers prepared in this example is shown; image 3 The simultaneous thermal analysis (TG / DSC) diagram of the aramid nanofibers prepared in this example is shown; Table 1 shows the properties of the prepared aramid nanofibers.

Embodiment 2

[0044] (1) Add 10g of Kevlar chopped fibers used in Example 1, 600ml of dimethyl sulfoxide (DMSO), 1g of KOH, and 1g of potassium ethoxide into the reaction vessel, under normal temperature environment, the high shear disperser rotates at 4000rpm under stirring for 5 min to obtain a light yellow uniform dispersion of macro aramid fibers.

[0045] (2) Add 15g of deionized water and 3g of KOH solution to the pre-dispersed liquid of step (1) respectively, and continue to stir for 0.5h; then add 10ml of ethanol and 1g of potassium ethoxide, adjust the rotational speed to 3000rpm and continue to stir for 1h , to obtain a black-red uniform transparent aramid nanofiber colloidal dispersion.

Embodiment 3

[0047] (1) Add 6g of Kevlar chopped fibers used in Example 1, 500ml of N,N-dimethylformamide (DMF), and 1g of potassium tert-butoxide into the reaction vessel, under normal temperature environment, high shear disperser 4000rpm Under the rotating speed, the pretreatment was stirred for 5 minutes to obtain a light yellow uniform dispersion of macro-aramid fibers.

[0048] (2) 18g deionized water, 3g KOH, 6g propanol were added to the pre-dispersed liquid in step (1) at one time, the rotating speed was adjusted to 3000 rpm and the reaction was continued for 2h to obtain a black-red uniform transparent aramid nanofiber colloidal dispersion liquid.

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Abstract

The invention provides a method for preparing aramid fiber nanofibers based on deprotonation of Kevlar, comprising: stirring and preprocessing a mixed system of aramid fiber, organic solvent and alkali to obtain aramid fiber dispersion; Proton donors and / or ionic reaction assistants are added to the aramid fiber dispersion to control the degree of deprotonation, thereby obtaining the aramid nanofiber colloidal dispersion. The present invention also provides the aramid nanofiber colloidal dispersion prepared by the method. The invention improves the nanometerization rate of aramid fibers (which can be within 1-4 hours) and the concentration of the reaction system (up to 4 wt% or more), and the prepared aramid nanofibers have uniform size and high stability (length 5-20 micron, 5-30 nanometers), large specific surface area and aspect ratio, and excellent high temperature resistance; the method has simple equipment and process, strong applicability, and solves the problems of long preparation period, low reaction concentration, low production efficiency, etc. High practical production and application value.

Description

technical field [0001] The invention relates to the technical field of polymer nanomaterials, in particular to a method for preparing aramid nanofibers rapidly and in large quantities based on Kevlar deprotonation reaction, and aramid nanofibers prepared by the method and the method of nanofibers. Background technique [0002] Kevlar is a high-performance para-aramid fiber, which was first developed and produced by Dupont in the 1960s and 1970s. P-phenylenediamine (PPTA), which is produced in my country is called Aramid-1414. Kevlar is a high polymer composed of a network of PPTA long molecular chains that are similar to rigid straight chains. Due to the π-π conjugated link between the benzene ring and the adjacent amide bond, the internal rotation energy is high, the molecular chain is closely arranged, the chain segments are highly oriented, and there is a strong intermolecular hydrogen bond. These factors are common Endows PPTA fiber with many advantages such as high st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/38D06M13/144D06M13/165D06M101/36
CPCD06M11/38D06M13/144D06M13/165D06M2101/36Y02P20/54
Inventor 马冠香刘圆圆刘韬李文静赵英民杨洁颖
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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