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Preparation method of composite wave-absorbing material and composite wave-absorbing material

A wave-absorbing material and composite technology, applied in the field of wave-absorbing materials, can solve problems such as poor effect of wave-absorbing materials, narrow absorption frequency band, poor thermal stability, etc., to improve thermal stability and oxidation resistance, and improve impedance matching characteristics, effect of prolonging service life

Active Publication Date: 2022-03-22
LUOYANG INST OF CUTTING EDGE TECH
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing a composite wave-absorbing material and the composite wave-absorbing material, so as to improve the existing magnetic medium-type wave-absorbing materials with high density, narrow absorption frequency band, and poor thermal stability, which are used alone as absorbers. The effect of wave materials is not good, and it is difficult to balance the technical problems of light weight and high-efficiency use requirements at the same time

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  • Preparation method of composite wave-absorbing material and composite wave-absorbing material
  • Preparation method of composite wave-absorbing material and composite wave-absorbing material

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preparation example Construction

[0035] In some embodiments of the present application, the preparation method of the composite absorbing material includes:

[0036] Step S1, dispersing the flaky graphene oxide in an aqueous solution of hexamethylenetetramine to obtain a first dispersion;

[0037] Step S2, dispersing the soluble cobalt salt and the soluble nickel salt into the first dispersion to obtain a second dispersion;

[0038] In step S3, a reducing agent is added to the second dispersion liquid, and the soluble cobalt salt, soluble nickel salt and graphene oxide are reduced by the reducing agent to obtain a composite wave-absorbing material. The method of step-by-step dispersion can improve the uniformity of mixing among the components. Firstly, the flaky graphene oxide is dispersed in the aqueous solution of cyclohexamethylenetetramine to obtain the first dispersion liquid, which can make the cyclohexamethylene tetramine Hexamethylenetetramine enters between the layers of flaky graphene oxide in adva...

Embodiment 1

[0070] This embodiment provides a composite absorbing material, the structure of which is as follows figure 1 As shown, the composite absorbing material includes reduced graphene oxide and Co magnetic micro-nano particles and Ni magnetic Wiener particles loaded on the reduced graphene oxide, and its specific preparation method is as follows:

[0071] (1) Graphite oxide is prepared by the Hummers chemical oxidation method, the obtained graphite oxide and distilled water are configured into an aqueous solution, and the power is 150W, the frequency is 53Hz, and ultrasonic stripping is carried out for 1-2 hours to obtain flaky graphene oxide;

[0072] (2) 0.6 g of hexamethylenetetramine (HMT) was added to 40 mL of deionized water, and magnetically stirred at 60° C. for 30 minutes to obtain an aqueous solution of hexamethylenetetramine;

[0073] (3) Add 50 mg of flaky graphene oxide to the aqueous solution of hexamethylenetetramine, stir it for 10 minutes and mix it uniformly to fo...

Embodiment 2

[0076] This embodiment provides a composite wave-absorbing material whose structure is the same as the composite wave-absorbing material provided in Example 1, and its specific preparation method is as follows:

[0077] (1) Graphite oxide is prepared by Hummers chemical oxidation method, the graphite oxide obtained and distilled water are configured into an aqueous solution, and the power is 150W, and the frequency is 53Hz, and ultrasonic stripping is carried out for 1-2 hours to obtain flaky graphene oxide ( GO);

[0078] (2) 0.6 g of hexamethylenetetramine (HMT) was added to 40 mL of deionized water, and magnetically stirred at 80° C. for 30 minutes to obtain an aqueous solution of hexamethylenetetramine;

[0079] (3) Add 60 mg of flaky graphene oxide to the aqueous solution of the above-mentioned cyclohexamethylenetetramine, stir it for 10 minutes and mix it uniformly to form the first dispersion; then add 1.2 mmol CoCl to the first dispersion 2 and 0.4mmolNiCl, and magnet...

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Abstract

The invention provides a preparation method of a composite wave-absorbing material and the composite wave-absorbing material, and relates to the technical field of wave-absorbing materials.The preparation method of the composite wave-absorbing material.The preparation method of the composite wave-absorbing material comprises the steps that hexamethylenetetramine is adopted as an inducer, soluble cobalt salt and soluble nickel salt are induced to be subjected to in-situ reduction on a graphene oxide sheet layer, and the composite wave-absorbing material is obtained; the composite wave-absorbing material comprises reduced graphene oxide, Co magnetic micro-nano particles and Ni magnetic micro-nano particles, and the Co magnetic micro-nano particles and the Ni magnetic micro-nano particles are loaded on the reduced graphene oxide. According to the composite wave-absorbing material, the structure-function integrated arrangement of a high-performance wave-absorbing material is realized, the impedance matching characteristic of graphene is improved, the wave-absorbing performance is improved, meanwhile, the thermal stability and the oxidation resistance are effectively improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a method for preparing a composite wave-absorbing material and the composite wave-absorbing material. Background technique [0002] Absorbing materials are functional materials that can effectively absorb and attenuate electromagnetic waves, and convert electromagnetic wave energy into other forms of energy through some internal interaction mechanisms. They have important research and application values ​​in both civil and military fields. With the continuous research and development of electromagnetic absorbing materials, the types of absorbing materials tend to be diversified and complicated, requiring them to develop in the direction of composite, intelligent and broadband. [0003] At present, the commonly used magnetic dielectric absorbing materials mainly include ferrite, magnetic metal powder (Fe, Co, Ni and their alloys) and carbonyl iron. These magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184B22F9/24B82Y30/00H05K9/00
CPCC01B32/184B22F9/24B82Y30/00H05K9/0081
Inventor 刘若鹏赵治亚肖成伟李自东王海清李明明
Owner LUOYANG INST OF CUTTING EDGE TECH
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