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CN-122013362-A - Aramid fiber-based MXene@Co3O4Composite wave-absorbing fiber and preparation method and application thereof

CN122013362ACN 122013362 ACN122013362 ACN 122013362ACN-122013362-A

Abstract

The invention provides an aramid fiber-based MXene@Co 3 O 4 composite wave-absorbing fiber, a preparation method and application thereof, wherein MXene/dimethyl sulfoxide dispersion liquid is mixed with aramid nanofiber/dimethyl sulfoxide dispersion liquid, and spinning solution A is obtained after ultrasonic defoaming; placing Co 3 O 4 powder into aramid nanofiber/dimethyl sulfoxide dispersion liquid, stirring, ultrasonic defoaming to obtain spinning solution B, coaxially wet spinning the spinning solution A and the spinning solution B, forming the fiber, and drying to obtain the composite wave-absorbing fiber. The composite fiber has a core-sheath structure, wherein a core layer is a composite system of MXene and aramid nanofiber, the MXene provides strong dielectric loss, the aramid nanofiber provides a fiber foundation mechanical support, the sheath layer is formed by compounding Co 3 O 4 and the aramid nanofiber, the magnetic loss characteristic of Co 3 O 4 is utilized to effectively optimize overall impedance matching and widen an absorption frequency band, and therefore the composite fiber has excellent mechanical strength and a multi-spectrum wave absorbing function.

Inventors

  • WANG HUIYA
  • ZHANG KAINA
  • LI XUNXUN
  • CHEN YUSHUANG
  • ZHU YAOFENG

Assignees

  • 浙江真爱毯业科技有限公司
  • 浙江理工大学

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. 1. The preparation method of the aramid fiber-based MXene@Co 3 O 4 composite wave-absorbing fiber comprises the following steps: Mixing the MXene/dimethyl sulfoxide dispersion liquid with the aramid nanofiber/dimethyl sulfoxide dispersion liquid, uniformly dispersing, and performing ultrasonic defoaming to obtain a spinning solution A, placing Co 3 O 4 powder into the aramid nanofiber/dimethyl sulfoxide dispersion liquid, stirring, and performing ultrasonic defoaming to obtain a spinning solution B; And (3) coaxially and wet spinning the spinning solution A and the spinning solution B, forming the fiber, and drying to obtain the aramid fiber-based MXene@Co 3 O 4 composite wave-absorbing fiber.
  2. 2. The method of claim 1, wherein the MXene/dimethyl sulfoxide dispersion is prepared according to the following method: Dissolving lithium fluoride in hydrochloric acid, adding Ti 3 AlC 2 powder, stirring at constant temperature for reaction to obtain solution A, mixing the solution A with water, centrifuging, repeatedly centrifuging/washing, collecting precipitate, dispersing in dimethyl sulfoxide for solvent exchange, oscillating and mixing uniformly, and centrifuging to obtain MXene/dimethyl sulfoxide dispersion; The aramid nanofiber/dimethyl sulfoxide dispersion liquid is prepared according to the following method: Mixing and stirring aramid fiber, potassium hydroxide, water and dimethyl sulfoxide to obtain an aramid nanofiber/dimethyl sulfoxide dispersion.
  3. 3. The preparation method according to claim 2, wherein the mass ratio of lithium fluoride to hydrochloric acid is 1:12-13; the mass ratio of the Ti 3 AlC 2 powder to the lithium fluoride is 1:1.5-1.7.
  4. 4. The preparation method according to claim 2, wherein the stirring temperature is 30-50 ℃ and the stirring time is 24-48 hours; The rotational speed of centrifugation is 3500-5000 rpm; and (5) repeatedly centrifuging/washing until the pH value of the supernatant is 6-7.
  5. 5. The preparation method according to claim 2, wherein the mass ratio of the aramid fiber to the potassium hydroxide is 1:1.45-1.55; stirring time is 4-8 hours.
  6. 6. The method of claim 1, wherein the Co 3 O 4 powder is prepared according to the following method: Dissolving cobalt nitrate hexahydrate in methanol to form a uniform solution A, dissolving 2-methylimidazole in methanol to obtain a solution B, pouring the solution B into the solution A, uniformly mixing, performing solvothermal reaction, collecting precipitate, washing, drying and calcining to obtain Co 3 O 4 powder.
  7. 7. The preparation method according to claim 6, wherein the solvothermal reaction is performed at a temperature of 120-160 ℃ for a time of 1-3 hours; the calcination temperature is 350-400 ℃ and the calcination time is 1-3 h.
  8. 8. The preparation method of claim 1, wherein the mass ratio of the MXene/dimethyl sulfoxide dispersion to the aramid nanofiber/dimethyl sulfoxide dispersion is 1:0.5-4; The time for preparing the spinning solution A to be uniformly dispersed is 4-12 hours.
  9. 9. A composite wave-absorbing fiber produced by the production method of any one of claims 1 to 8; the composite wave-absorbing fiber is of a core-sheath structure; the core layer is prepared by compounding MXene and aramid nanofibers; the sheath layer is made by compounding Co 3 O 4 and aramid nanofibers.
  10. 10. An application of the composite wave-absorbing fiber prepared by the preparation method of any one of claims 1-8 in wearable integrated electromagnetic equipment.

Description

Aramid fiber-based MXene@Co 3O4 composite wave-absorbing fiber and preparation method and application thereof Technical Field The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to an aramid fiber-based MXene@Co 3O4 composite wave absorbing fiber, and a preparation method and application thereof. Background With the rapid development of portable and wearable intelligent devices, higher requirements are put on electromagnetic wave absorbing materials, including the characteristics of light weight, flexibility, functional integration, high stability and the like. The wave absorbing materials widely used at present mostly exist in the form of powder or block, and the practical requirements of complex equipment on deformation adaptability and wearing comfort are difficult to meet. The one-dimensional functional fiber has become one of ideal candidate materials for constructing the wearable wave absorbing device by virtue of flexible structural design and adjustable electrical property. However, the existing technology relies on modifying the flexible fiber substrate by a surface coating method, and the problems of weak coating adhesion, insufficient stability, obvious mechanical property reduction and the like generally exist. The key to realizing the high-performance fiber-based wave-absorbing material is to orderly assemble the nanoscale functional units into macroscopic fibers with hierarchical structures. The development of the tunable electromagnetic function fiber with excellent mechanical property and stable environment has important significance for promoting the development of wearable integrated electromagnetic equipment. Disclosure of Invention In view of the above, the invention aims to provide an aramid fiber-based MXene@Co 3O4 composite wave-absorbing fiber, and a preparation method and application thereof. The invention provides a preparation method of an aramid fiber-based MXene@Co 3O4 composite wave-absorbing fiber, which comprises the following steps: Mixing the MXene/dimethyl sulfoxide dispersion liquid with the aramid nanofiber/dimethyl sulfoxide dispersion liquid, uniformly dispersing, and performing ultrasonic defoaming to obtain a spinning solution A, placing Co 3O4 powder into the aramid nanofiber/dimethyl sulfoxide dispersion liquid, stirring, and performing ultrasonic defoaming to obtain a spinning solution B; And (3) coaxially and wet spinning the spinning solution A and the spinning solution B, forming the fiber, and drying to obtain the aramid fiber-based MXene@Co 3O4 composite wave-absorbing fiber. Preferably, the MXene/dimethyl sulfoxide dispersion is prepared as follows: Dissolving lithium fluoride in hydrochloric acid, adding Ti 3AlC2 powder, stirring at constant temperature for reaction to obtain solution A, mixing the solution A with water, centrifuging, repeatedly centrifuging/washing, collecting precipitate, dispersing in dimethyl sulfoxide for solvent exchange, oscillating and mixing uniformly, and centrifuging to obtain MXene/dimethyl sulfoxide dispersion; The aramid nanofiber/dimethyl sulfoxide dispersion liquid is prepared according to the following method: Mixing and stirring aramid fiber, potassium hydroxide, water and dimethyl sulfoxide to obtain an aramid nanofiber/dimethyl sulfoxide dispersion. Preferably, the mass ratio of the lithium fluoride to the hydrochloric acid is 1:12-13; the mass ratio of the Ti 3AlC2 powder to the lithium fluoride is 1:1.5-1.7. Preferably, the stirring temperature is 30-50 ℃ and the stirring time is 24-48 h; The rotational speed of centrifugation is 3500-5000 rpm; and (5) repeatedly centrifuging/washing until the pH value of the supernatant is 6-7. Preferably, the mass ratio of the aramid fiber to the potassium hydroxide is 1:1.45-1.55; stirring time is 4-8 hours. Preferably, the Co 3O4 powder is prepared according to the following method: Dissolving cobalt nitrate hexahydrate in methanol to form a uniform solution A, dissolving 2-methylimidazole in methanol to obtain a solution B, pouring the solution B into the solution A, uniformly mixing, performing solvothermal reaction, collecting precipitate, washing, drying and calcining to obtain Co 3O4 powder. Preferably, the temperature of the solvothermal reaction is 120-160 ℃ and the time is 1-3 hours; the calcination temperature is 350-400 ℃ and the calcination time is 1-3 h. Preferably, the mass ratio of the MXene/dimethyl sulfoxide dispersion liquid to the aramid nanofiber/dimethyl sulfoxide dispersion liquid is 1:0.5-4; The time for preparing the spinning solution A to be uniformly dispersed is 4-12 hours. The invention provides a composite wave-absorbing fiber, which is prepared by the preparation method according to the technical scheme; the composite wave-absorbing fiber is of a core-sheath structure; the core layer is prepared by compounding MXene and aramid nanofibers; the sheath layer is made by compounding Co 3O4 and ar