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Method for preparing electromagnetic wave absorption material from hydrotalcite-based composite nanofiber

A technology for composite nanofibers and absorbing materials, which is applied in the field of preparing electromagnetic wave absorbing materials from hydrotalcite-based composite nanofibers

Active Publication Date: 2020-10-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Materials with excellent microwave-absorbing properties need to have the characteristics of thin thickness, wide frequency band, light weight, and strong absorption, but it is often difficult to satisfy a single component at the same time. Composite materials have become promising microwave-absorbing materials.

Method used

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  • Method for preparing electromagnetic wave absorption material from hydrotalcite-based composite nanofiber
  • Method for preparing electromagnetic wave absorption material from hydrotalcite-based composite nanofiber
  • Method for preparing electromagnetic wave absorption material from hydrotalcite-based composite nanofiber

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Measure 10mL of N,N-dimethylformamide, add 0.8g of polyacrylonitrile and 0.08g of FeOOH to it to make a solution, which is the outer layer solution; measure 10mL of N,N-dimethylformamide base formamide, adding 0.8g polyacrylonitrile and 0.05g carbon nanotubes to it to prepare a solution, which is the core layer solution; the two solutions are respectively added to the syringe, using a coaxial needle, the inner needle and the core layer The solution is connected, the outer needle is connected to the outer solution, the electric field voltage is set to 18kV, the receiving distance is 15cm, and the solution flow rate is 1.5mL / h; the fiber membrane obtained by spinning is dried in a vacuum oven at 60°C for 8h to obtain FeOOH-doped Polyacrylonitrile fiber membrane;

[0028] (2) prepare the mixed salt solution of nickel chloride and ferric chloride, Ni 2+ and Fe 3+ The molar ratio is 3:1, Ni 2+ The concentration of urea is 0.015mol / L, the amount of urea is twice the am...

Embodiment 2

[0033] With embodiment 1, difference is: in step (1), the consumption of carbon nanotube is 0.1g; In step (2), replace nickel chloride and ferric chloride with nickel nitrate and ferric nitrate; In step (3), The time and temperature of the pre-oxidation treatment are: 300°C pre-oxidation treatment for 2 hours.

Embodiment 3

[0035] With embodiment 1, difference is: in step (1), the consumption of FeOOH is 0.1g, the voltage of described high voltage electrospinning method is 15kV; In step (2), the temperature of described reaction is 100 ℃, and reaction time 14h; in step (3), the time and temperature of roasting treatment are: 900°C roasting treatment for 3h.

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Abstract

The invention discloses a method for preparing an electromagnetic wave absorption material from hydrotalcite-based composite nanofiber. The method comprises the following steps: preparing a polymer fiber film with an outer layer doped with a hydrotalcite growth seed source and a core layer doped with carbon nanotubes by using a coaxial electrostatic spinning technology, then preparing a compositefiber film loaded with hydrotalcite and provided with a multilevel structure through a hydrothermal method, then carrying out pre-oxidation and roasting to prepare the electromagnetic wave absorptionmaterial. According to the method for preparing the electromagnetic wave absorption material from hydrotalcite-based composite nanofiber, the electromagnetic wave material with a three-dimensional conductive network structure is formed by combining carbon nanofiber, the carbon nanotubes and metal nanoparticles; the electromagnetic wave absorption performance of the electromagnetic wave material isexcellent and is significantly superior to that of the single electromagnetic wave absorbent; and the electromagnetic wave material has the advantages of light weight, thin body and adjustable electromagnetic parameters.

Description

technical field [0001] The invention belongs to the technical field of preparation of electromagnetic wave absorbing materials, in particular to a method for preparing electromagnetic wave absorbing materials from hydrotalcite-based composite nanofibers. Background technique [0002] In recent years, due to the increasingly serious problem of electromagnetic radiation pollution and the development of modern military stealth technology, electromagnetic wave absorbing materials have attracted widespread attention. Carbon materials such as carbon nanotubes (CNTs) have excellent electrical conductivity, high mechanical strength and low density, and are good dielectric loss absorbing materials; magnetic metal compounds such as hydrotalcite roasted products have excellent magnetic properties. It is a good magnetic loss absorbing material. Materials with excellent microwave-absorbing properties need to have the characteristics of thin thickness, wide frequency band, light weight, ...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/728D06C7/04D01F8/08D01F1/10H05K9/00D06M11/65D06M11/49D06M101/28
CPCD04H1/4382D04H1/728D06C7/04D01F8/08D01F1/10D06M11/49D06M11/65H05K9/0081D06M2101/28
Inventor 宋宇飞鱼甜甜陈伟王维
Owner BEIJING UNIV OF CHEM TECH
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