Preparation method of short rod-like aramid nanofiber, aramid nanofiber and application

A technology of nanofibers and para-aramid fibers, which is applied in nanotechnology, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of shortening the reaction cycle, environmental pollution of organic solvents, and low output, and achieve shortening of the reaction cycle and operation Convenience and the effect of improving production efficiency

Pending Publication Date: 2021-12-31
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for preparing short rod-shaped aramid nanofibers and its application in order to overcome the defects of long reaction cycle, low output, and environmental pollution caused by organic solvents in the preparatio

Method used

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  • Preparation method of short rod-like aramid nanofiber, aramid nanofiber and application
  • Preparation method of short rod-like aramid nanofiber, aramid nanofiber and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of short rod-shaped aramid fiber, comprising the following steps:

[0027] (1) Put 20g of absolutely dry para-aramid fiber with an average length of 3mm into a beaker, add water to 200g, mix evenly and add it to a PFI beater, and the beating speed is 5000r to obtain para-aramid fiber A;

[0028] (2) Take 1g of para-aramid fiber A, add 50mL of water into a beaker with 5gKOH, place the beaker in a water bath, and stir with the aid of a stirrer to obtain para-aramid fiber dispersion A; the processing conditions are: water bath The temperature is 80°C, the rotation speed of the agitator is 500r, and the treatment time is 3h;

[0029] (3) Vacuum filter the para-aramid fiber dispersion A obtained in step (2) to a pH of 8 to obtain para-aramid fiber dispersion B;

[0030] (4) Put the para-aramid fiber dispersion B obtained in step (3) into the steam explosion feeding bin and explode to obtain a short rod-shaped aramid nanofiber aqueous solution, and obtai...

Embodiment 2

[0032] A preparation method of short rod-shaped aramid fiber, comprising the following steps:

[0033] (1) Put 20g of absolutely dry para-aramid fiber with an average length of 1mm into a beaker, add water to 200g, mix evenly and add it to a PFI beater, and the beating speed is 10000r to obtain para-aramid fiber A;

[0034] (2) Take 1g of para-aramid fiber A, add 10g of KOH to 50mL of water in a beaker;

[0035] (3) Place the beaker containing the para-aramid fiber and KOH solution system obtained in step (2) in a water bath, and stir with the aid of a stirrer to obtain para-aramid fiber dispersion A; the treatment conditions For: the temperature of the water bath is 80°C, the rotation speed of the agitator is 500r, and the treatment time is 3h;

[0036] (4) Vacuum filter the para-aramid fiber dispersion A obtained in step (3) to a pH of 8 to obtain para-aramid fiber dispersion B;

[0037] (5) Put the para-aramid fiber dispersion B obtained in step (4) into the steam explosi...

Embodiment 3

[0039] A preparation method of short rod-shaped aramid fiber, comprising the following steps:

[0040] (1) Put 20g of absolutely dry para-aramid fiber with an average length of 1mm into a beaker, add water to 200g, mix evenly and add it to a PFI beater, and the beating speed is 20000r to obtain para-aramid fiber A;

[0041] (2) Take 1g of para-aramid fiber A, add 20g of KOH to 50mL of water in a beaker;

[0042] (3) Place the beaker containing the para-aramid fiber and KOH solution system obtained in step (2) in a water bath, and stir with the aid of a stirrer to obtain para-aramid fiber dispersion A; the treatment conditions For: the temperature of the water bath is 80°C, the rotation speed of the agitator is 500r, and the treatment time is 3h;

[0043] (4) Vacuum filter the para-aramid fiber dispersion A obtained in step (3) to a pH of 8 to obtain para-aramid fiber dispersion B;

[0044] (5) Put the para-aramid fiber dispersion B obtained in step (4) into the steam explosi...

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Abstract

The invention discloses a preparation method of short rod-like aramid nanofiber, aramid nanofiber and application, and belongs to the technical field of polymer nanomaterials. The aramid nanofiber prepared by the invention is the short rod-like aramid nanofiber with the diameter of 100 to 800 nm. The preparation method comprises the following steps of pulping para-aramid fiber in a PFI machine, adding obtained pulp into a KOH solution, heating, stirring and dispersing uniformly, then washing an obtained aramid fiber dispersion with vacuum filtration until the dispersion is weakly alkaline, and finally putting the dispersion into a steam explosion feeding bin and obtaining the aramid nanofiber by regulating the pressure, time and other conditions. The aramid nanofiber prepared by the invention is in a short rod shape and can be dispersed in the water or a hydrophilic solvent, so that the diversified application of the aramid nanofiber is greatly expanded. In the preparation process, no organic solvent is used, so that the method is environment-friendly; and the method is low in cost, high in treatment efficiency, simple in process and suitable for large-scale process production, and the preparation method is mainly a mechanical method.

Description

technical field [0001] The invention belongs to the technical field of polymer nanomaterials, and in particular relates to a method for preparing short rod-shaped aramid nanofibers, aramid nanofibers and applications. Background technique [0002] One-dimensional aramid fiber, especially aramid nanofiber ANF, not only maintains the light weight, high strength, high temperature resistance, corrosion resistance, high flame retardancy and insulation of the above-mentioned macro-aramid fiber PPTA fiber, but also has the properties of polymer nanofiber Unique nano-effect, large aspect ratio and high specific surface area, excellent mechanical properties. It can serve as one of the most promising building blocks comparable to carbon nanotubes (CNTs) and cellulose nanofibers. Nanoscale ANF brings mechanical and optical properties that aramid fibers cannot achieve. In addition, the abundant active groups on the surface of ANF, large aspect ratio and specific surface area endow it ...

Claims

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Application Information

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IPC IPC(8): D01F6/60D01F11/08B82Y40/00
CPCD01F6/605D01F11/08B82Y40/00
Inventor 程博闻杨硕马玉莹舒登坤李晨暘王天一
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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