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Preparation method of Fe3O4/rGO/polyimide aerogel electromagnetic wave-absorbing material

An electromagnetic absorbing and polyimide technology, which is applied in the field of preparation of Fe3O4/rGO/polyimide airgel electromagnetic absorbing materials, to achieve the effect of promoting magnetic properties, increasing eddy current loss, and increasing specific surface area

Active Publication Date: 2022-07-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

But how to convert Fe 3 o 4 The introduction of polyimide airgel materials has not been reported

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  • Preparation method of Fe3O4/rGO/polyimide aerogel electromagnetic wave-absorbing material
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  • Preparation method of Fe3O4/rGO/polyimide aerogel electromagnetic wave-absorbing material

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Embodiment 1

[0028] Fe of the present invention 3 O 4 The preparation method of / rGO / polyimide aerogel electromagnetic wave absorbing material specifically includes the following steps:

[0029] (1) Preparation of Fe 3 O 4 / rGO: Add 0.6g ferrous chloride tetrahydrate and 1.62g ferric chloride hexahydrate into 100mL deionized water, stir evenly, add sodium hydroxide solution with a concentration of 1mol / L to adjust the pH of the solution 4.0; at this time, add 20 mL of graphene oxide aqueous solution with a mass concentration of 2 mg / mL, continue to stir, and heat the solution at the same time, the heating temperature is 45 ° C, to which the sodium hydroxide solution with a concentration of 1 mol / L is continuously added until the solution pH The value is 10.0; the precipitate obtained after the reaction is magnetically separated, washed and dried; the product obtained after the reaction is the reduced graphene oxide with spherical ferric oxide nanoparticles grown on it, which is Fe 3 O ...

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Abstract

The invention discloses a preparation method of a Fe3O4 / rGO / polyimide aerogel electromagnetic wave-absorbing material, which comprises the following steps: (1) preparing Fe3O4 / rGO: adding ferrite and ferric salt into water, uniformly stirring, and adding a sodium hydroxide solution to adjust the pH value of the solution to 4; the preparation method comprises the following steps: adding an aqueous solution of graphene oxide into a reaction kettle, adding a sodium hydroxide solution into the reaction kettle under stirring and heating conditions to enable the solution to be alkaline, reacting to obtain a product which is spherical ferroferric oxide nanoparticles grown on reduced graphene oxide, magnetically separating the product, and washing and drying the product; (2) preparing polyamide acid; (3) preparing a Fe3O4 / rGO / polyimide aerogel precursor; adding the polyamide acid prepared in the step (2) into a mixed solution of triethylamine and water, magnetically stirring, adding the Fe3O4 / rGO in the step (1), stirring, and carrying out freeze drying treatment; and (4) calcining the freeze-dried product in the step (3) in an inert atmosphere to obtain the required product.

Description

technical field [0001] The present invention relates to a kind of Fe 3 O 4 Preparation method of / rGO / polyimide aerogel electromagnetic wave absorbing material. Background technique [0002] Modern electronic equipment is increasingly popular in the military and civilian fields, and the electromagnetic wave pollution problem caused by it is also increasing. It is urgent to reduce the problem of electromagnetic interference. Electromagnetic shielding and absorbing materials have received extensive attention as key materials for protecting human beings and precision equipment. Since traditional powder materials can no longer meet the multi-faceted requirements in practical applications, many researchers have begun to develop advanced multifunctional materials. Among them, aerogels have attracted much attention due to their simple preparation process and high yield. [0003] In recent years, studies have found that multi-functionalization is the future development direction ...

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Application Information

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IPC IPC(8): C08J9/28C08L79/08C08K3/22C08K3/04
CPCC08J9/28C08J9/0071C08J2379/08C08J2201/0484
Inventor 姬广斌顾未华沈宇宏郭雯诣方艺霆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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