Method for preparing aramid nanofibers

A nanofiber, para-aramid fiber technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of long reaction period, low reaction concentration, shortened reaction period, etc., to achieve easy operation, excellent rigidity, increased The effect of proton exchange rate

Active Publication Date: 2019-07-26
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of the existing deprotonation reaction in the preparation of aramid nanofibers, such as long reaction period, low reaction concentration, and determination of the quantitative reaction end point, the invention is easy to operate, can quickly and successfully prepare aramid nanofibers, and greatly shortens the reaction time. At the same time, it can realize the preparation of high-concentration aramid nanofibers and realize the quantitative judgment of the reaction end point, which is expected to promote the large-scale production and diversified applications of aramid nanofibers

Method used

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  • Method for preparing aramid nanofibers
  • Method for preparing aramid nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 1g of para-aramid fiber with an average length of 4mm and 1.5g KOH into 500ml DMSO solution, and place in a 1000ml beaker;

[0034] (2) Place the beaker containing the para-aramid fiber, KOH and DMSO mixed system obtained in step (1) in a water bath, and perform ultrasonic treatment with an ultrasonic cell crusher to obtain ultrasonic-treated para-aramid fiber Suspension A; The processing conditions are: ultrasonic power is 300W, ultrasonic treatment time is 150min, ultrasonic working time: 4s, ultrasonic gap: 2s; further, ice cubes are continuously added to ensure that the temperature of the water bath is maintained below 40°C.

[0035] (3) Add water to the ultrasonically treated para-aramid fiber suspension A obtained in step (2), and the ratio of the volume of the added water to the absolute dry mass of the para-aramid fiber is 2.5:1 ml / g, to obtain Para-aramid fiber suspension B.

[0036] (4) The para-aramid fiber suspension B obtained in step (3) is sealed and pl...

Embodiment 2

[0039] (1) Add 1g of para-aramid fiber with an average length of 5mm and 1.5g of KOH to 500ml of DMSO solution and place it in a 1000ml beaker;

[0040] (2) Place the beaker containing the para-aramid fiber, KOH and DMSO mixed system obtained in step (1) in a water bath, and perform ultrasonic treatment with an ultrasonic cell crusher to obtain ultrasonic-treated para-aramid fiber Suspension A; the treatment conditions are: ultrasonic power is 400W, ultrasonic treatment time is 120min, ultrasonic working time: 4s, ultrasonic gap: 2s; further, ice cubes are added continuously to ensure that the temperature of the water bath is maintained below 40°C.

[0041] (3) Add water to the ultrasonically treated para-aramid fiber suspension A obtained in step (2), and the ratio of the volume of the added water to the absolute dry mass of the para-aramid fiber is 5:1 ml / g, to obtain Para-aramid fiber suspension B.

[0042] (4) The para-aramid fiber suspension B obtained in step (3) was sealed an...

Embodiment 3

[0045] (1) Add 1g of para-aramid fiber with an average length of 6mm and 1.5g of KOH into 500ml DMSO solution and place it in a 1000ml beaker;

[0046] (2) Place the beaker containing the para-aramid fiber, KOH and DMSO mixed system obtained in step (1) in a water bath, and perform ultrasonic treatment with an ultrasonic cell crusher to obtain ultrasonic-treated para-aramid fiber Suspension A; the treatment conditions are: ultrasonic power is 500W, ultrasonic treatment time is 90min, ultrasonic working time: 4s, ultrasonic gap: 2s; further, ice cubes are continuously added to ensure that the temperature of the water bath is maintained below 40°C.

[0047] (3) Add water to the ultrasonically treated para-aramid fiber suspension A obtained in step (2), and the ratio of the volume of the added water to the absolute dry mass of the para-aramid fiber is 8:1 ml / g, to obtain Para-aramid fiber suspension B.

[0048] (4) The para-aramid fiber suspension B obtained in step (3) is sealed and p...

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Abstract

The invention discloses a method for preparing aramid nanofibers. Para-aramid fibers and KOH are added into DMSO (dimethylsulfoxide) solution to obtain a mixed system of para-aramid fibers, KOH and DMSO; the mixed system of para-aramid fibers, KOH and DMSO is ultrasonically treated in an ice water bath to obtain a para-aramid fiber suspension A; water is added into the para-aramid fiber suspensionA to obtain a para-aramid fiber suspension B; after being sealed, the para-aramid fiber suspension B is stirred to obtain an ANFs/DMSO (aramid nanofibers/DMSO) solution; the ANFs/DMSO solution is subjected to colloidal titration through a cation standard liquid; whether a reaction endpoint is reached is judged according to cation demand; if the reaction endpoint is reached, aramid nanofibers areprepared; if the reaction endpoint is not reached, the previous step is repeated until the reaction endpoint is reached. The method has the advantages that reaction time is shortened greatly, reactionconcentration is increased, reaction efficiency is improved evidently, and the method is easy to apply to large-scale production.

Description

Technical field [0001] The invention belongs to the field of polymer nano materials, and specifically relates to a method for preparing aramid nanofibers. Background technique [0002] Aramid Nanofibers (ANFs), as a new polymer nanofiber with excellent performance in recent years, are similar to the most widely used inorganic nano-reinforced materials (such as nanoparticles, nanowires, nanotubes, nanosheets) in the material field , Has a unique nano-scale structure, large aspect ratio and specific surface area, while retaining the excellent mechanical properties and temperature resistance of aramid macro fibers, bringing it mechanical, electrical and electrical properties that cannot be achieved by conventional chemical fibers. Optical properties make it a new type of "building unit" for the construction of macroscopic composite materials. It plays an important role in interface enhancement. It is widely used in advanced materials such as composite reinforcement, electrical insul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 杨斌王琳张美云宋顺喜罗晶晶丁雪瑶聂景怡谭蕉君
Owner SHAANXI UNIV OF SCI & TECH
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