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Preparation method of graphene-coated manganese dioxide composite wave-absorbing agent

A technology of graphene coating and manganese dioxide, which is applied in the direction of graphene, manganese oxide/manganese hydroxide, nanotechnology for materials and surface science, etc., can solve the problems of weak bonding, secondary agglomeration, Composite interface performance is poor and other problems, to achieve the effect of optimized impedance matching performance, good dispersion performance, and excellent composite interface

Active Publication Date: 2020-01-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art and solve the technical problems of weak bonding force of heterogeneous materials, poor composite interface performance, and serious secondary agglomeration, the invention provides a preparation method of graphene-coated manganese dioxide composite wave absorbing agent

Method used

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  • Preparation method of graphene-coated manganese dioxide composite wave-absorbing agent

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Embodiment 1

[0023] A preparation method of graphene-coated manganese dioxide composite wave absorbing agent, comprising the following steps:

[0024] S1, take by weighing manganese sulfate and ammonium persulfate of certain quality respectively, wherein the mol ratio of manganese sulfate and ammonium persulfate is 0.1:1, leave it for later use;

[0025] S2. Slowly add the manganese sulfate weighed in step S1 into the graphene oxide aqueous solution with a concentration of 3 mg / mL for 3 minutes, and at the same time perform magnetic stirring for 30 minutes to form a gel, which will be reserved for later steps use;

[0026] S3. Slowly add the ammonium persulfate weighed in step S1 into the gel prepared in step S2 at a uniform speed for 15 minutes, and magnetically stir at the same time for 1 hour to prepare a mixed solution, which will be used in the next step;

[0027] S4, subjecting the mixed solution prepared in step S3 to hydrothermal treatment, the heating temperature is 100° C., and ...

Embodiment 2

[0030] A preparation method of graphene-coated manganese dioxide composite wave absorbing agent, comprising the following steps:

[0031] S1, take by weighing manganese sulfate and ammonium persulfate of certain quality respectively, and wherein the mol ratio of manganese sulfate and ammonium persulfate is 10:1, leave it for later use;

[0032] S2. Slowly add the manganese sulfate weighed in step S1 into the graphene oxide aqueous solution with a concentration of 0.5 mg / mL for 5 minutes, and at the same time, perform magnetic stirring for 50 minutes to make a gel and leave it for later Step use;

[0033] S3. Slowly add the ammonium persulfate weighed in step S1 into the gel prepared in step S2 at a uniform speed, the addition time is 25 minutes, and magnetic stirring is carried out at the same time, the stirring time is 30 minutes, and a mixed solution is prepared, which will be used in the next step;

[0034] S4, subjecting the mixed solution prepared in step S3 to hydrother...

Embodiment 3

[0037] A preparation method of graphene-coated manganese dioxide composite wave absorbing agent, comprising the following steps:

[0038] S1, take by weighing manganese sulfate and ammonium persulfate of a certain quality respectively, wherein the mol ratio of manganese sulfate and ammonium persulfate is 6:1, leave it for later use;

[0039] S2. Slowly add the manganese sulfate weighed in step S1 into the graphene oxide aqueous solution with a concentration of 10 mg / mL for 30 min, and at the same time perform magnetic stirring for 1 h to form a gel, which will be reserved for the next step use;

[0040] S3. Slowly add the ammonium persulfate weighed in step S1 into the gel prepared in step S2 at a uniform speed for 10 minutes, and magnetically stir at the same time for 1.2 hours to prepare a mixed solution, which will be used in the next step;

[0041] S4, subjecting the mixed solution prepared in step S3 to hydrothermal treatment, the heating temperature is 200° C., and the ...

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Abstract

The invention relates to a preparation method of a graphene-coated manganese dioxide composite wave-absorbing agent, belongs to the technical field of electromagnetic wave-absorbing materials, and solves the technical problems of weak binding force, poor composite interface performance and serious secondary agglomeration of heterogeneous materials, and the specific preparation process comprises the following steps: S1, weighing manganese sulfate and ammonium persulfate; s2, slowly adding the manganese sulfate into a graphene oxide aqueous solution at a constant speed, and carrying out magneticstirring at the same time, so as to prepare gel; s3, slowly adding the ammonium persulfate into the prepared gel at a constant speed, and magnetically stirring at the same time; s4, performing hydrothermal treatment on the mixed solution; and S5, separating a reaction product, washing the reaction product with deionized water until the reaction product is neutral, and freeze-drying the reaction product to obtain the graphene-coated manganese dioxide composite wave absorbing agent. The two components are tightly compounded in a chemical bond mode, the dielectric loss performance of the manganese dioxide to incident electromagnetic waves is brought into play, the multiple scattering performance of reduced graphene to the incident electromagnetic waves is combined, the preparation process issimple, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave-absorbing materials, relates to the cross technical field of material science and chemical synthesis preparation, and specifically relates to a preparation method of a graphene-coated manganese dioxide composite wave-absorbing agent for electromagnetic wave absorption. Background technique [0002] In the current society, electromagnetic pollution has become another major pollution after water pollution, air pollution, and noise pollution. It not only poses a threat to human health, but also interferes with the normal operation of other electronic equipment, which brings great harm to the information security of individuals, enterprises and even the country. serious threat. Electromagnetic wave absorption is one of the effective ways to prevent electromagnetic pollution. In the electromagnetic wave absorbing material, the wave absorbing agent is the key point, which directly determin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B32/184B82Y40/00B82Y30/00H05K9/00
CPCB82Y30/00B82Y40/00C01G45/02C01P2004/16C01P2004/80C01B32/184H05K9/0081
Inventor 陈成猛刘卓孔庆强李晓明郭晓倩
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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