Method for preparing aramid nanofibers by using mechanical coupling chemical alkali dissolution method

A technology of nanofibers and aramid fibers, which is applied in pulping with inorganic alkali, fiber raw material treatment, cellulose pulp post-treatment, etc. It can solve the problems of low production efficiency, low reaction concentration, and long reaction time, and achieve temperature resistance Excellent performance, increased reaction concentration, improved specific surface area and surface activity

Active Publication Date: 2018-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the method takes too long to react (up to 7-10 days), the reaction concentration is low (≤0.2%), and the preparation efficiency is low.
Therefore, this method is currently only in the laboratory research stage, and there is still a long way to go from real industrial production and commercialization.

Method used

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  • Method for preparing aramid nanofibers by using mechanical coupling chemical alkali dissolution method

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Embodiment 1

[0031] A method for preparing aramid nanofibers by a mechanically coupled chemical alkali solution in this embodiment, the specific preparation steps are as follows:

[0032] (1) Utilize the PFI refiner to refine the para-aramid precipitated fiber, the refining concentration is 15% (mass concentration), the refining revolution is 20000r, the refining gap is 0.1mm, and the degree of beating is 70 °SR, to obtain fibrillated para-aramid fibers;

[0033] (2) The fibrillated para-aramid fiber obtained in step (1) is subjected to high-speed stirring treatment, the stirring speed is 6000rpm, and the stirring time is 45min to obtain a well-dispersed aramid fiber slurry;

[0034] (3) The well-dispersed aramid fiber slurry obtained in step (2) is carried out homogenization treatment with a homogenizer, the homogeneous concentration is 0.2% (mass concentration), the homogeneous pressure is 60MPa, and the homogeneous number of times is 25 times, and drying to obtain aramid fiber after ho...

Embodiment 2

[0037] A method for preparing aramid nanofibers by a mechanically coupled chemical alkali solution in this embodiment, the specific preparation steps are as follows:

[0038] (1) Utilize the PFI refiner to refine the para-aramid precipitated fiber, the refining concentration is 13% (mass concentration), the refining revolution is 40000r, the refining gap is 0.1mm, and the degree of beating is 74 °SR, to obtain fibrillated para-aramid fibers;

[0039] (2) The fibrillated para-aramid fiber obtained in step (1) is subjected to high-speed stirring treatment, the stirring speed is 10000rpm, and the stirring time is 35min to obtain a well-dispersed aramid fiber slurry;

[0040](3) The well-dispersed aramid fiber slurry obtained in step (2) is carried out homogenization treatment with a homogenizer, the homogeneous concentration is 0.4% (mass concentration), the homogeneous pressure is 80MPa, and the homogeneous number of times is 21 times, and drying to obtain aramid fiber after ho...

Embodiment 3

[0043] A method for preparing aramid nanofibers by a mechanically coupled chemical alkali solution in this embodiment, the specific preparation steps are as follows:

[0044] (1) Utilize the PFI refiner to refine the para-aramid precipitated fiber, the refining concentration is 11% (mass concentration), the refining revolution is 60000r, the refining gap is 0.15mm, and the degree of beating is 78 °SR, to obtain fibrillated para-aramid fibers;

[0045] (2) The fibrillated para-aramid fiber obtained in step (1) is subjected to high-speed stirring treatment, the stirring speed is 12000rpm, and the stirring time is 30min to obtain a well-dispersed aramid fiber slurry;

[0046] (3) The well-dispersed aramid fiber slurry obtained in step (2) is carried out homogenization treatment by a homogenizer, the homogeneous concentration is 0.6% (mass concentration), the homogeneous pressure is 100MPa, and the homogeneous number of times is 18 times, and drying to obtain aramid fiber after h...

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Abstract

The invention discloses a method for preparing aramid nanofibers by using a mechanical coupling chemical alkali dissolution method. According to the method provided by the invention, fibrillation treatment is coupled with homogenization treatment, so that the size of aramid fibers is greatly reduced before a deprotonation reaction is performed, the specific surface area and surface activity of thearamid fibers are improved, the sub-micron-sized aramid fibers and a KOH/DMSO system are more easily subjected to a rapid deprotonation process, the reaction time is greatly shortened, the reaction concentration is increased, the reaction efficiency is significantly improved, and industrialized production is facilitated; the method has a simple preparation process, realizes short-process preparation and is easy to control; and the prepared aramid nanofibers have a small diameter, good size homogeneity, a large length-diameter ratio, high strength and excellent heat resistance, can be used asa novel construction enhancement unit of construction of macro composite materials, and has broad application prospects in the fields of composite materials, biology, medicine, electronics, energy sources and the like.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials, and in particular relates to a method for preparing aramid nanofibers by a mechanical coupling chemical alkali dissolution method. Background technique [0002] Para-aramid fiber (PPTA) is a high-performance synthetic fiber with high strength, high modulus, insulation and high temperature resistance. It is an ideal raw material for protective and reinforcing materials, and is widely used in aerospace, national defense, and electronic communications. , petrochemical and other fields. The high-strength and high-temperature-resistant properties of para-aramid fibers come from the rigid chain structure formed by π-π conjugation inside the molecular chain, the dense and ordered two-dimensional network structure formed by hydrogen bonds between molecular chains and van der Waals forces. However, this structural feature leads to defects such as smooth surface of aramid fibers, few active groups, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/20D21C3/02D21C9/00
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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