Method for preparing aramid nanofibers based on deprotonation of Kevlar and nanofiber prepared thereby

A technology of aramid fibers and nanofibers, 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: 2021-06-01
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 obtained dispersion (0.2% by weight). The deprotonation preparation method of "big to small" Kevlar nanofibers, the preparation cycle of the dispersion liquid with a concentr...

Method used

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  • Method for preparing aramid nanofibers based on deprotonation of Kevlar and nanofiber prepared thereby
  • Method for preparing aramid nanofibers based on deprotonation of Kevlar and nanofiber prepared thereby
  • Method for preparing aramid nanofibers based on deprotonation of Kevlar and nanofiber prepared thereby

Examples

Experimental program
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Embodiment 1

[0041] (1) 6g Kevlar chopped fibers (approximately 12-20 microns in diameter, 6 mm in length, purchased from DuPont), 500ml dimethyl sulfoxide (DMSO), and 1g KOH were added to the reaction vessel. Stirring and pretreatment for 5 minutes at a speed of 4000 rpm in a shearing disperser to obtain a light yellow uniform dispersion of macroscopic aramid fibers.

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

Embodiment 2

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

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

Embodiment 3

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

[0048] (2) Add 18g of deionized water, 3g of KOH, and 6g of propanol to the pre-dispersion in step (1) at one time, adjust the rotating speed to 3000rpm and continue stirring for 2h to obtain a black-red uniform transparent aramid nanofiber colloidal dispersion .

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Abstract

The invention provides a method for preparing aramid nanofibers based on Kevlar deprotonation. The method comprises the following steps: stirring and pretreating a mixed system of aramid fibers, an organic solvent and alkali to obtain an aramid fiber dispersion liquid; and adding a proton donor and/or an ionic reaction aid into the aramid fiber dispersion liquid to regulate and control the deprotonation degree so as to obtain an aramid nanofiber colloidal dispersion liquid. The invention further provides the aramid nanofiber colloidal dispersion liquid prepared by the method. According to the method, the nanocrystallization rate (within 1-4 hours) and the concentration (can reach 4 wt% or above) of a reaction system of the aramid fiber are increased, and the prepared aramid nanofibers are uniform in size, high in stability (the length is 5-20 microns and 5-30 nanometers), large in specific surface area and length-diameter ratio and excellent in high temperature resistance; and the method is simple in equipment and process and high in applicability, solves the problems of long preparation period, low reaction concentration, low production efficiency and the like, and has extremely high actual production and application values.

Description

technical field [0001] The invention relates to the technical field of polymer nanomaterials, in particular to a method for rapidly and mass-preparing aramid nanofibers based on Kevlar deprotonation reactions, aramid nanofibers prepared by the method, and aramid nanofibers prepared by the method. of nanofibers. Background technique [0002] Kevlar is a high-performance para-aramid fiber. It was first developed and produced by Dupont in the 1960s and 1970s. Its trade name is Aramid and its chemical name is polyethylene terephthalate. P-phenylene diamide (PPTA), which is produced in my country, is called aramid-1414. Kevlar is a high polymer composed of PPTA long molecular chain network crosslinks that are similar to rigid extended 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 chains are tightly arranged, the chain segments are highly oriented, and there are strong intermolecula...

Claims

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Application Information

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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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