A kind of preparation method of graphene-coated manganese dioxide composite wave absorbing agent

Abstract

The invention relates to a preparation method of a graphene-coated manganese dioxide composite wave-absorbing agent, which belongs to the technical field of electromagnetic wave-absorbing materials, and solves the technical problems of weak bonding force of heterogeneous materials, poor composite interface performance, and serious secondary agglomeration, specifically The preparation process includes: S1, weighing manganese sulfate and ammonium persulfate; S2, adding manganese sulfate into the graphene oxide aqueous solution slowly at a uniform speed, and magnetically stirring at the same time to obtain a gel; S3, adding ammonium persulfate slowly at a uniform speed In the prepared gel, magnetic stirring is performed at the same time; S4, the mixed solution is subjected to hydrothermal treatment; S5, the reaction product is separated, washed with deionized water to neutrality, and freeze-dried to obtain a graphene-coated manganese dioxide composite absorber agent. The invention makes the two components tightly combined by chemical bonds, which not only exerts the dielectric loss performance of manganese dioxide on incident electromagnetic waves, but also combines the multiple scattering performance of reduced graphene on incident electromagnetic waves, and has a simple preparation process and is easy to realize. industrialization.

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...

Examples

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 at the same time perform magnetic stirring 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° ...

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 to the gel prepared in step S2 at a uniform speed for 25 minutes, and at the same time perform magnetic stirring for 30 minutes to prepare a mixed solution, which will be used in the next step;

[0034] S4, subjecting the mixed solution prepared in step S3 to hydrothermal treatment, the heating temperature is 120° C., ...

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 ...

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...

Examples

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 at the same time perform magnetic stirring 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° ...

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 to the gel prepared in step S2 at a uniform speed for 25 minutes, and at the same time perform magnetic stirring for 30 minutes to prepare a mixed solution, which will be used in the next step;

[0034] S4, subjecting the mixed solution prepared in step S3 to hydrothermal treatment, the heating temperature is 120° C., ...

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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