A method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper

A para-aramid paper and nanofiber technology, applied in fiber raw materials, recycling technology, fiber raw material processing, etc., can solve the problems of high energy consumption in mechanical processing, poor uniformity of aramid fiber, unfavorable recycling treatment, etc., to achieve High added value, excellent heat resistance, and large aspect ratio

Active Publication Date: 2020-09-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only uses mechanical treatment, which consumes a lot of energy, and the uniformity of the obtained para-aramid fibers is poor, and there are still incompletely dissociated aramid broken sheets or fiber bundles in the system, which is not conducive to recycling.

Method used

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  • A method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper
  • A method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper

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Embodiment 1

[0047] In this embodiment, a method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper, the specific preparation steps are as follows:

[0048] (1) The raw materials include aramid chopped fibers and para-aramid pulp fibers, and undergo the following hot pressing conditions: line pressure 30kN / m, hot pressing temperature 220°C, hot pressing roll speed 1.5m / min, hot pressing times The aramid fiber paper that has been hot-pressed once is crushed by a hydropulper with a mass concentration of 1.5% when crushed, and the obtained broken aramid paper fragments have a specification length of 1 to 3 cm;

[0049] (2) Put the aramid broken paper fragments obtained in step (1) in 10% phosphoric acid solution, adjust the pulp mass concentration to 1.5%, and use ultrasonic treatment, the ultrasonic conditions are: power 300W, ultrasonic time is 80min, and the ultrasonic is finished Afterwards, it was washed and dried with deionized water;

[0050] (3) 0.5 g...

Embodiment 2

[0056] In this embodiment, a method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper, the specific preparation steps are as follows:

[0057] (1) The raw materials include aramid chopped fibers and para-aramid fibrids, and undergo the following hot pressing conditions: line pressure 50kN / m, hot pressing temperature 230°C, hot pressing roll speed 2.0m / min, hot pressing times The aramid paper that has been hot-pressed twice is crushed with a hydropulper, the mass concentration is 2.5% when crushed, and the length of the obtained broken aramid paper fragments is 1-3 cm;

[0058] (2) Place the aramid broken paper fragments obtained in step (1) in 15% phosphoric acid solution, adjust the pulp mass concentration to 2.5%, and use ultrasonic treatment, the ultrasonic conditions are: power 500W, ultrasonic time is 70min, and the ultrasonic is finished Afterwards, it was washed and dried with deionized water;

[0059] (3) 0.7g of aramid broken paper f...

Embodiment 3

[0065] In this embodiment, a method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper, the specific preparation steps are as follows:

[0066] (1) The raw materials include aramid chopped fibers, para-aramid pulp fibers and para-aramid fibrids, and undergo the following hot-pressing conditions: line pressure 80kN / m, hot-pressing temperature 240°C, hot-pressing roll speed The aramid paper that has been hot-pressed at 3.0 m / min and the number of times of hot pressing twice is crushed by a hydropulper, and the mass concentration is 3.5%.

[0067] (2) Place the aramid broken paper fragments obtained in step (1) in 20% phosphoric acid solution, adjust the pulp mass concentration to 3.5%, and use ultrasonic treatment. The ultrasonic conditions are: power 700W, ultrasonic time 60min, and the ultrasonic is finished Afterwards, it was washed and dried with deionized water;

[0068] (3) 1.0 g of aramid broken paper fragments, potassium hydroxide (KOH) ...

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Abstract

The invention discloses a method for preparing water dispersible aramid fiber nanofiber by utilizing recycled para-aramid paper. The method is characterized in that a phosphoric acid solution is utilized to cooperatively and ultrasonically treat hot-pressed para-aramid paper with high strength and high modulus, and the aramid fiber nanofiber is prepared through an DMSO / KOH system; and the preparedaramid fiber nanofiber is small in diameter, is great in slenderness ratio, is high in surface activity, is excellent in heat resistance, and also can be uniformly dispersed in a water-phase system.The method solves the problems that hot-pressed paper generated in an existing aramid paper production process only can be used as waste for landfill to cause resource waste, energy consumption is great, fiber uniformity is relatively poor and aramid paper sheets or fiber bundles which are not completely dissociated are left in the system, and recycling is not facilitated and the like as aramid paper is only mechanically treated.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials, and in particular relates to a method for preparing water-dispersed aramid nanofibers by using recycled para-aramid paper. Background technique [0002] Para-aramid fiber (PPTA) is a high-performance synthetic fiber with high strength, high modulus, excellent insulation and high temperature resistance, and is an ideal raw material for protective and reinforcing materials. Para-aramid paper is made by using para-aramid chopped fiber and para-aramid pulp fiber as raw materials through wet-process papermaking and hot-pressing process. In para-aramid paper, chopped fibers are used as the skeleton material and are evenly dispersed in the paper, which determines the physical strength and mechanical structure of the paper; aramid pulp is used as a filling and bonding material, which is softened by heat during the hot pressing process. The overall mechanical structure of the paper is formed by bondi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02D21C5/00D21B1/32D21B1/34
CPCD21B1/32D21B1/345D21C5/00D21C5/02Y02W30/64
Inventor 杨斌张美云陆赵情罗晶晶宋顺喜
Owner SHAANXI UNIV OF SCI & TECH
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