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A preparation method of carbon fiber absorbing material with dielectric and eddy current loss

A wave-absorbing material and eddy current loss technology, which is applied in the field of wave-absorbing materials, can solve problems such as weak magnetic loss capability, cumbersome and complicated preparation process of composite materials, and difficulty in composite wave-absorbing materials, achieving excellent absorption performance, low price, Effects with a wide effective bandwidth

Active Publication Date: 2022-03-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the loss mechanism of common carbon-based absorbing materials is dielectric loss, such as graphite, carbon black, etc., but the magnetic loss ability of these carbon-based absorbing materials is very weak, so that they are often used as matrix materials and ferric oxide and other magnetic materials. Materials are compounded, and the preparation process of these composite materials is relatively cumbersome and complicated, which makes the prepared composite absorbing materials quite difficult in practical use.

Method used

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  • A preparation method of carbon fiber absorbing material with dielectric and eddy current loss
  • A preparation method of carbon fiber absorbing material with dielectric and eddy current loss
  • A preparation method of carbon fiber absorbing material with dielectric and eddy current loss

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Embodiment 1

[0029] A method for preparing a carbon fiber absorbing material with dielectric loss and eddy current loss characteristics, the specific steps are as follows:

[0030] (1) Preparation of polyvinyl alcohol and diammonium hydrogen phosphate mixed aqueous solution: mix polyvinyl alcohol and diammonium hydrogen phosphate with deionized water, stir evenly at 90°C for 3 hours, cool to room temperature, and obtain polyvinyl alcohol with a mass fraction of 5%. A mixed aqueous solution of vinyl alcohol and 1% diammonium hydrogen phosphate; the viscosity of the polyvinyl alcohol is 40.0 Pa.s, and the degree of alcoholysis is 87.0 mol%.

[0031] (2) Preparation of precursor: Add the mixed aqueous solution into a syringe using an industrial flat-tipped needle, and use an electrospinning device to collect at a cylinder rotating at a rate of 50 rpm using a voltage of 10 kV and a feeding rate of 100 μL / h. Electrospinning is carried out with the collector, and the distance between the collect...

Embodiment 2

[0036] A method for preparing a carbon fiber absorbing material with dielectric loss and eddy current loss characteristics, the specific steps are as follows:

[0037] (1) Preparation of polyvinyl alcohol and diammonium hydrogen phosphate mixed aqueous solution: mix polyvinyl alcohol and diammonium hydrogen phosphate with deionized water, stir evenly at 95°C for 5 hours, cool to room temperature, and obtain polyvinyl alcohol with a mass fraction of 15%. A mixed aqueous solution of vinyl alcohol and 5% diammonium hydrogen phosphate; the polyvinyl alcohol has a viscosity of 48.0 Pa.s and an alcoholysis degree of 89.0 mol%.

[0038](2) Preparation of precursors: Add the mixed aqueous solution into a syringe using an industrial flat-tipped needle, and use an electrospinning device to collect at a cylinder rotating at a rate of 200 rpm with a voltage of 25 kV and a feeding rate of 800 μL / h. Electrospinning is carried out with the collector, and the collector is 20cm away from the n...

Embodiment 3

[0043] A method for preparing a carbon fiber absorbing material with dielectric loss and eddy current loss characteristics, the specific steps are as follows:

[0044] (1) Preparation of polyvinyl alcohol and diammonium hydrogen phosphate mixed aqueous solution: mix polyvinyl alcohol and diammonium hydrogen phosphate with deionized water, stir evenly at 93°C for 4 hours, cool to room temperature, and obtain polyvinyl alcohol with a mass fraction of 10%. A mixed aqueous solution of vinyl alcohol and 3% diammonium hydrogen phosphate; the polyvinyl alcohol has a viscosity of 45.0 Pa.s and an alcoholysis degree of 88.0 mol%.

[0045] (2) Preparation of precursors: Add the mixed aqueous solution into a syringe using an industrial flat-tipped needle, and use an electrospinning device to collect at a cylinder rotating at a rate of 100 rpm using a voltage of 15 kV and a feeding rate of 500 μL / h. Electrospinning is carried out with the collector, and the collector is 10 cm away from th...

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Abstract

The invention relates to the technical field of wave-absorbing materials, in particular to a method for preparing a carbon fiber wave-absorbing material with dielectric and eddy current loss, using an aqueous solution of polyvinyl alcohol and diammonium hydrogen phosphate as a precursor of a fibrous product obtained by electrospinning, After the precursor is pre-oxidized in air and carbonized at high temperature in inert gas, it is uniformly mixed and dispersed with paraffin in acetone, and then solidified and formed. The invention solves the problem that the carbon fundamental wave material has only dielectric loss and poor magnetic loss in the prior art, and the prepared carbon fiber absorbing material not only has the dielectric loss characteristic, but also because of the structure, the bridged carbon fibers cause tendencies The skin effect makes carbon fiber have eddy current loss characteristics, which is superior to traditional carbon-based absorbing materials, and can be applied to aircraft stealth coatings and other fields.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a method for preparing a carbon fiber wave-absorbing material with dielectric loss and eddy current loss characteristics. Background technique [0002] Absorbing material is a type of material that can absorb or greatly reduce the electromagnetic wave energy received by its surface, thereby reducing the interference of electromagnetic waves. In engineering applications, in addition to requiring a high absorption rate of electromagnetic waves in a wide frequency band, the absorbing material is also required to have properties such as light weight, temperature resistance, moisture resistance, and corrosion resistance. With the development of modern science and technology, both military and civilian electromagnetic waves are closely related to human beings, but the impact of electromagnetic radiation on the environment is increasing day by day. At airports, flights...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L91/06C08K7/06D01F9/21H05K9/00
CPCC08K7/06D01F9/21H05K9/009C08L91/06
Inventor 祁阳戴步实
Owner NORTHEASTERN UNIV LIAONING
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