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Hollow ferroferric oxide microsphere@polyaniline/polyimide composite film wave-absorbing material and preparation method thereof

A technology of ferric oxide and composite film, which is applied in the field of hollow ferric oxide microsphere@polyaniline/polyimide composite film absorbing material and preparation, which can solve the problem of high complex permittivity and difficulty in meeting impedance matching. , thin thickness, light weight, impedance mismatch, etc., to increase the probability of reflection and refraction, reduce phase separation, and improve absorbing performance.

Pending Publication Date: 2019-04-12
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And these fields often have the problem of electromagnetic wave pollution, therefore, it is necessary to endow polyimide film or coating material with the ability of microwave absorption
[0003] Because the dielectric constant and magnetic permeability of traditional single absorbing materials are often mismatched, it is difficult to meet the requirements of impedance matching, thin thickness, light weight, wide frequency band, and strong absorption. In recent years, research has mainly focused on composite materials and its structural modification
The complex permittivity of ferroferric oxide is low and the magnetic permeability is high, and there are disadvantages such as impedance mismatch, poor dispersion, and easy agglomeration; the complex permittivity of polyaniline is high and the magnetic permeability is low, and the degree of impedance matching is not high.

Method used

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  • Hollow ferroferric oxide microsphere@polyaniline/polyimide composite film wave-absorbing material and preparation method thereof
  • Hollow ferroferric oxide microsphere@polyaniline/polyimide composite film wave-absorbing material and preparation method thereof
  • Hollow ferroferric oxide microsphere@polyaniline/polyimide composite film wave-absorbing material and preparation method thereof

Examples

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preparation example Construction

[0027] A preparation method of hollow ferroferric oxide microsphere@polyaniline / polyimide composite film absorbing material, which is characterized in that it comprises the following operation steps:

[0028] (1) Add 4-28ml of ethylenediamine dropwise to the ratio of 0.04g / 1ml FeCl 3 ·6H 2 O / ethylene glycol solution; keep stirring, then put it into the autoclave and react at 150~200℃ for 6~16h; after natural cooling to room temperature, hollow ferroferric oxide microspheres are obtained; the resulting product After being separated from the solvent, it is washed with ethanol and deionized water several times, and dispersed in water for storage;

[0029] (2) To the prepared aqueous dispersion of hollow ferroferric oxide microspheres, add 5-10ml of aniline, keep it at 0-4℃ and keep stirring; after the mixture is uniform, add dropwise to a concentration of 0.2g / ml Of (NH 4 ) 2 S 2 O 8 Aqueous solution, keeping the temperature conditions and stirring rate unchanged during the period, af...

Embodiment 1

[0037] A preparation method of hollow ferroferric oxide microsphere@polyaniline / polyimide composite film absorbing material, including the following operation steps:

[0038] (1) Under the condition of continuous stirring, add 4ml of ethylenediamine dropwise to 30ml of FeCl with a ratio of 0.04g / 1ml 3 ·6H 2 O / ethylene glycol solution, then put it in an autoclave, and react at 200℃ for 16h; after being naturally cooled to room temperature, hollow ferroferric oxide microspheres with an average outer diameter of 130nm and an average inner diameter of 50nm are obtained ; After separating the resulting product from the solvent, it is washed with ethanol and deionized water several times, and dispersed in water for storage;

[0039] (2) Add 5ml aniline to 1.9×10 -3 g / ml hollow ferroferric oxide microspheres in the aqueous dispersion, keep it at 0~4℃ and keep stirring; after mixing uniformly, add 25ml of 0.2g / ml (NH 4 ) 2 S 2 O 8 Aqueous solution, keep the temperature condition and stirrin...

Embodiment 2

[0044] Preparation method of hollow ferroferric oxide microsphere@polyaniline / polyimide composite film absorbing material, including

[0045] Include the following steps:

[0046] (1) Under the condition of continuous stirring, add 28ml of ethylenediamine dropwise to 200ml of FeCl with a ratio of 0.04g / 1ml 3 ·6H 2 O / ethylene glycol solution, then put it into the autoclave, react at 150℃ for 9h; after cooling to room temperature, get hollow ferroferric oxide microspheres with an average outer diameter of 500nm and an average inner diameter of 300nm ; After separating the resulting product from the solvent, it is washed with ethanol and deionized water several times, and dispersed in water for storage;

[0047] (2) Add 5ml aniline to 6.7×10 -3 g / ml hollow ferroferric oxide microspheres in the aqueous dispersion, keep 0~4℃ and continue to stir; after mixing uniformly, add 50ml of 0.2g / ml (NH 4 ) 2 S 2 O 8 Aqueous solution, keep the temperature condition and stirring rate unchanged durin...

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Abstract

The invention belongs to the field of electromagnetic wave absorbing material preparation, and relates to a hollow ferroferric oxide microsphere@polyaniline / polyimide composite film wave-absorbing material and a preparation method thereof. The preparation method comprises the following operation steps: (1) preparing hollow ferroferric oxide microspheres; (2) preparing polyaniline coated hollow ferroferric oxide microspheres; and (3) mixing the polyaniline coated hollow ferroferric oxide microspheres with a polyamide acid solution, and carrying out programmed heating and curing to obtain the hollow ferroferric oxide microsphere@polyaniline / polyimide composite film wave-absorbing material. The material has the advantages of light weight, thin thickness, controllable electromagnetic wave absorption performance, electromagnetic shielding suitable for objects with complex surfaces, and the like, and absorption performance is better.

Description

Technical field [0001] The invention belongs to the field of electromagnetic wave absorption material preparation, and particularly relates to a hollow ferroferric oxide microsphere@polyaniline / polyimide composite film wave absorption material and a preparation method. Background technique [0002] Polyimide has excellent mechanical properties, chemical stability and heat resistance, and has a wide range of applications in aerospace and microelectronics. However, these fields often have the problem of electromagnetic wave pollution. Therefore, it is necessary to give the polyimide film or coating material the ability to absorb microwaves. [0003] Because the dielectric constant and permeability of traditional single absorbing materials are often mismatched, it is difficult to meet the requirements of impedance matching, thin thickness, light weight, bandwidth, and strong absorption. In recent years, research has mainly focused on composite materials and Its structural modificatio...

Claims

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Application Information

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IPC IPC(8): C08L79/04C08L79/02C08K7/24C08G73/02C08J5/18
CPCC08G73/0266C08J5/18C08J2379/04C08J2479/02C08K2201/003
Inventor 方芳彭飞詹自力
Owner ZHENGZHOU UNIV
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