Graphene conductive magnetic material and preparation method thereof

Abstract

The invention relates to the technical field of graphene magnetic composite materials, and particularly discloses a graphene conductive magnetic material and a preparation method thereof.The method comprises the following steps that S1, deionized water, graphene, a polymer additive and a magnetic material are weighed, the polymer additive is dispersed in water and fully stirred, the magnetic material is added, stirring is conducted, and a first mixed solution is obtained; s2, weighing a pH regulator, and dissolving the pH regulator in water to obtain a second mixed solution; s3, in a stirring state, slowly adding the second mixed solution into the first mixed solution, stopping stirring until no turbid substance is generated, and filtering and purifying to obtain a mixture; s4, drying the mixture, and calcining to obtain the graphene magnetic composite material. The graphene conductive magnetic material has self-repairability, conductivity and magnetism, can solve the problems of single function and low sensitivity of the current electronic skin material, meets diversified application requirements, and is suitable for popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of graphene magnetic composite materials, and in particular to a graphene conductive magnetic material and a preparation method thereof. Background Art

[0002] With the rapid development of wearable electronic devices in recent years, flexible electronic skin, as the most important part of human-computer interaction, has received close attention. Electronic skin is a system that allows robots to have a sense of touch. It has a simple structure and can be processed into various shapes, similar to the perception function of human skin. It can be attached to the surface of the device like clothes, allowing the robot to sense the location and orientation of the object as well as hardness and other information. It is widely used in wearable devices, medical monitoring, precision manufacturing, intelligent logistics, humanoid robots and other fields.

[0003] At present, most electronic skin products on the market have relatively simple functionality and poor sensitivity, which makes it difficult to meet the growing needs of intelligent robots. It is of great significance to develop electronic skin materials with self-healing, conductivity and magnetism.

[0004] For example, a patent document with an application date of December 22, 2017 and a Chinese patent application number of 201711429897.X discloses a method for preparing a magnetic functionalized graphene composite material, which includes the following steps: 1) mixing graphene microsheets and magnetic nanoparticles evenly by airflow dispersion; 2) dispersing them in an ethanol solvent by ultrasonic dispersion; 3) adding a silane coupling agent, an auxiliary agent and maleic anhydride grafted polypropylene and mixing them evenly; 4) preparing a functionalized carbon material powder by spray drying equipment; 5) calcining the carbon material powder to obtain a magnetic functionalized graphene composite material.

[0005] The inventors of this application have found that this magnetically functionalized graphene composite material has good electrical conductivity and uniformity, but does not have strong self-repairing properties. Electronic skin may suffer various forms of damage during application, such as scratches, wear or tear, and self-repairing properties are also essential. Therefore, it is urgent to develop a graphene conductive magnetic material with self-repairing properties, electrical conductivity and magnetism. Summary of the invention

[0006] The technical problem to be solved by the present invention is to develop a graphene conductive magnetic material with self-healing, conductivity and magnetism as mentioned in the above part.

[0007] According to one aspect of the present invention, a method for preparing a graphene conductive magnetic material is provided, which comprises the following steps: S1. Weigh a certain amount of deionized water, graphene, polymer additives and magnetic materials, disperse the graphene and polymer additives in water and stir them thoroughly, add the magnetic material and continue stirring until the system is fully dispersed and mixed to obtain a first mixed solution; S2, weighing a certain amount of pH adjuster and dissolving it in water to obtain a second mixed solution; S3, slowly adding the second mixed solution to the first mixed solution under stirring until no turbidity is generated, stopping stirring, and filtering and purifying to obtain a mixture; S4, drying the mixture in step S3, and calcining the mixture after drying to obtain a graphene magnetic composite material; Among them, the mass ratio of graphene to water is 1: (10~1000), the mass ratio of polymer additive to water is 1: (10~1000), the mass ratio of magnetic material to water is 1: (10~800), and the mass ratio of pH adjuster to water is 1: (10~300).

[0008] In some embodiments, the polymer auxiliary agent is selected from one or more of carboxymethyl cellulose, carboxyethyl cellulose, ethyl cellulose, carboxymethyl ethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, cellulose acetate, styrene maleimide resin, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polyvinylidene fluoride, polyethylene glycol, polyacrylamide, polyacrylic acid, polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylonitrile and polystyrene.

[0009] In some embodiments, the magnetic material is selected from one or more of iron salts, cobalt salts, nickel-based alloys, and rare earth materials.

[0010] In some embodiments, the pH adjuster is selected from one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonium carbonate, sodium carbonate, and aqueous ammonia.

[0011] In some embodiments, the pH value of the second mixed solution ranges from 6.0 to 9.0.

[0012] In some embodiments, the iron salt is selected from one or more of ferric chloride, ferric nitrate, ferric oxide, ferrocene and ferric sulfate, and / or the cobalt salt is selected from one or more of cobalt nitrate, cobalt chloride and cobalt tetroxide, and / or the nickel-based alloy is selected from one or more of nickel sulfate, nickel chloride and nickel nitrate, and / or the rare earth material includes ferrite.

[0013] In some embodiments, the filtration purification includes using deionized water and / or ethanol for suction filtration and / or centrifugal filtration and / or pressure filtration for washing and purification.

[0014] In some embodiments, drying comprises freeze drying and / or vacuum oven drying and / or forced air oven drying.

[0015] In some embodiments, the calcination temperature is 150° C. to 800° C., the heating rate is 0.5° C. / min to 10° C. / min, and the holding time is 0.5 h to 12 h.

[0016] According to another aspect of the present invention, a graphene conductive magnetic material is provided, which is prepared by the method mentioned in the above technical solution.

[0017] Through the above technical scheme, the graphene conductive magnetic material provided by the present invention has self-healing, conductivity and magnetism when applied to robot electronic skin, which solves the problem of single function and low sensitivity of current electronic skin materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A process flow chart of a method for preparing a graphene conductive magnetic material according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] The present invention provides these embodiments to make this disclosure thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0022] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly perpendicular, but is within the tolerance range. "Parallel" is not strictly parallel, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0024] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0025] All terms used in the present invention have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0026] Technologies, methods, and apparatus known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and apparatus should be considered part of the specification.

[0027] like Figure 1 As shown, the present invention provides a method for preparing a graphene conductive magnetic material, which comprises the following steps: S1. Weigh a certain amount of deionized water, graphene, polymer additives and magnetic materials, disperse the graphene and polymer additives in water and stir them thoroughly, add the magnetic material and continue stirring until the system is fully dispersed and mixed to obtain a first mixed solution; S2, weighing a certain amount of pH adjuster and dissolving it in water to obtain a second mixed solution; S3, slowly adding the second mixed solution to the first mixed solution under stirring until no turbidity is generated, stopping stirring, and filtering and purifying to obtain a mixture; S4, drying the mixture in step S3, and calcining the mixture after drying to obtain a graphene magnetic composite material; The mass ratio of graphene to water is 1:(10-1000), preferably, the mass ratio of graphene to water is 1:125.

[0028] The mass ratio of the polymer additive to water is 1:(10-1000), preferably, the mass ratio of the polymer additive to water is 1:100.

[0029] The mass ratio of the magnetic material to water is 1:(10-800), preferably, the mass ratio of the magnetic material to water is 1:125.

[0030] The mass ratio of the pH adjuster to water is 1:(10-300), preferably, the mass ratio of the pH adjuster to water is 1:100.

[0031] Specifically, the graphene can be dissolved in water first, and then the polymer additive is added to dissolve; or the graphene can be dissolved in water separately and then mixed.

[0032] Graphene not only has excellent electrical conductivity and mechanical properties, but also has multiple functions such as thermal conductivity and optical properties. This allows graphene conductive magnetic materials to achieve the integration of multiple functions when preparing electronic skin, such as temperature perception, pressure perception, etc. The present invention can make graphene conductive magnetic materials have magnetic response capabilities by adding magnetic materials. This ability enables electronic skin to sense and respond to changes in external magnetic fields, providing robots with richer perception information. Polymer additives can not only improve the dispersibility of graphene in materials, but also enhance the mechanical properties of materials, such as tensile strength, toughness, etc., which makes electronic skin more durable and less prone to damage when subjected to external forces.

[0033] In a specific embodiment, the polymer auxiliary agent includes one or more of carboxymethyl cellulose, carboxyethyl cellulose, ethyl cellulose, carboxymethyl ethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, cellulose acetate, styrene maleimide resin, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polyvinylidene fluoride, polyethylene glycol, polyacrylamide, polyacrylic acid, polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylonitrile, and polystyrene.

[0034] Polymer additives can effectively help graphene to be evenly dispersed in the material and avoid agglomeration. This evenly dispersed graphene can significantly improve the electrical conductivity and mechanical properties of the material. At the same time, polymer additives can also enhance the stability of the material, making it less likely for the performance of graphene conductive magnetic materials to degrade during long-term use. Polymer additives usually have a certain reinforcing effect and can improve the tensile strength, toughness and other mechanical properties of graphene conductive magnetic materials. This makes the electronic skin more durable when subjected to external forces, and can withstand greater deformation and impact, thereby extending its service life.

[0035] Polymer additives can also provide additional functional properties for graphene conductive magnetic materials. For example, some polymer additives have thermoplasticity or elasticity, which can make the electronic skin more flexible and elastic while maintaining conductivity and magnetism. In addition, polymer additives with special functions, such as antioxidants, UV inhibitors, etc., can also be introduced to improve the weather resistance and durability of the material.

[0036] Based on the above embodiments, the magnetic material includes one or more of iron salts, cobalt salts, nickel-based alloys and rare earth materials.

[0037] Among the above-mentioned magnetic materials, iron salts have relatively low costs, which is conducive to large-scale production and application, and have less environmental impact, which meets the requirements of sustainable development; cobalt salts have high magnetic permeability, which makes them have excellent performance in high-frequency magnetic fields; nickel-based alloys have excellent high-temperature performance and corrosion resistance, which can maintain stable magnetism in high-temperature environments and be used for a long time in harsh environments without corrosion; rare earth permanent magnet materials have extremely high coercivity, which allows them to maintain stable magnetism in strong magnetic fields. In actual production, appropriate magnetic materials can be selected according to the specific use environment to make better use of their unique beneficial effects.

[0038] In a specific embodiment, the pH adjusting agent includes one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonium carbonate, sodium carbonate, and ammonia water. The pH adjusting agent can adjust the pH of the mixed solution and provide a suitable environment for the reaction of graphene, polymer additives and magnetic materials. This helps to fully react and evenly mix the components, thereby improving the performance of the composite material. By adjusting the pH value, the solubility and stability of each component in the mixed solution can be controlled, precipitation or stratification can be prevented during the preparation process, and the uniformity and stability of the composite material can be ensured. Preferably, the pH adjusting agent is sodium hydroxide.

[0039] Based on the above embodiments, the pH value of the second mixed solution ranges from 6.0 to 9.0. For the combination of graphene, polymer additives and magnetic materials, a common pH range is alkaline, that is, the pH value is between 6.0 and 9.0. Within this range, these materials can usually maintain good solubility and stability, and are also conducive to full reaction and uniform mixing between the components. However, it should be noted that the specific pH range also needs to be adjusted according to the experimental conditions and the required functional properties. If it is necessary to react or store in a specific acid-base environment, then it is necessary to select the corresponding pH range. In addition, it is also necessary to consider the effect of pH on material properties, such as conductivity, magnetism and mechanical properties. Preferably, the pH value of the second mixed solution is 7.5.

[0040] In a specific embodiment, the iron salt includes one or more of ferric chloride, ferric nitrate, ferric oxide, ferrocene and ferric sulfate, the cobalt salt includes one or more of cobalt nitrate, cobalt chloride and cobalt tetroxide, the nickel-based alloy includes one or more of nickel sulfate, nickel chloride and nickel nitrate, and the rare earth material includes ferrite.

[0041] Based on the above embodiments, filtration and purification include filtering with one or more of deionized water and ethanol. As a physical treatment method, filtration and purification can remove insoluble impurities in the mixture that may affect the quality and performance of the final product, such as particulate matter, suspended matter, etc. The low conductivity of deionized water makes it advantageous in situations where high insulation or conductivity avoidance is required. The solubility of ethanol enables it to remove some organic impurities that deionized water cannot remove.

[0042] The filtration method is one or more of suction filtration, centrifugal filtration and filter press for washing and purification. The suction filter itself does not require a large amount of chemical raw materials, so it can reduce environmental pollution and resource waste; the centrifugal filter separates impurities and particles in the liquid through a high-speed rotating centrifugal drum, which has a significant filtration effect. This physical filtration method does not require the addition of any chemical reagents, which is both environmentally friendly and efficient; the filter press uses high-pressure pressing technology, which can reduce the moisture content of the mixture to a low level in a short time.

[0043] In a specific embodiment, drying includes one or more of freeze drying, vacuum oven drying and air-blast oven drying. Freeze drying avoids the damage to the graphene crystal structure caused by high temperature treatment by sublimating the water in the graphene in the form of ice crystals at low temperature; vacuum oven accelerates the evaporation of water by reducing the air pressure, thereby quickly removing the water in the graphene; air-blast oven blows hot air quickly across the graphene surface by forced convection to achieve efficient drying.

[0044] On the basis of the above embodiments, the calcination temperature is 150~800℃, the heating rate is 0.5~10℃ / min, and the holding time is 0.5~12h. The selection of the calcination temperature range depends on the performance of the target product and the required crystal structure. Higher temperatures help promote the crystallization of graphene and the improvement of its electrical conductivity, but too high a temperature may lead to excessive sintering or oxidation of graphene. In combination with the specific reaction conditions of the present invention, the calcination temperature is 150~800℃, the heating rate is 0.5~10℃ / min, and the holding time is 0.5~12h. Preferably, the calcination temperature is 800℃, the heating rate is 10℃ / min, and the holding time is 3h.

[0045] The present application also provides a graphene conductive magnetic material, which is prepared by any method of the above technical solutions.

[0046] The present invention is described below by means of specific examples.

[0047] Example 1 1. Weigh 1000g of deionized water and 8g of graphene oxide powder, stir thoroughly to dissolve, then add 10g of polyvinylidene fluoride and 10g of polyacrylonitrile, and continue to stir and disperse. After dispersion, add 4g of ferric chloride and 4g of nickel nitrate, stir at 1500r / min, and stir for 60min until the system is fully dispersed and mixed.

[0048] 2. Weigh 10 g of sodium hydroxide, a pH adjuster, and dissolve it in 190 g of water. While stirring, add the sodium hydroxide solution to the dispersion in step 1 until no turbidity is produced, then stop stirring.

[0049] 3. Wash and purify by suction filtration, with a suction filtration pressure of -0.1 MPa and a suction filtration time of 60 min. After multiple suction filtration and washing with deionized water, a graphene composite magnetic material precursor is obtained.

[0050] 4. Dry the mixture obtained in step 3 under freeze-drying conditions.

[0051] 5. The dried mixture was calcined in a high-temperature oven at a calcination temperature of 800°C, a heating rate of 10°C / min, and a holding time of 3h to obtain a graphene composite magnetic material.

[0052] Example 2 1. Weigh 1000g of deionized water and 15g of graphene oxide powder, stir thoroughly to dissolve, then add 20g of polyvinyl pyrrolidone and 20g of carboxymethyl ethyl cellulose, and continue to stir and disperse. After dispersion, add 8g of ferric nitrate and 8g of nickel sulfate, stir at 2000r / min, and stir for 100min until the system is fully dispersed and mixed.

[0053] 2. Weigh 10 g of sodium bicarbonate, a pH adjuster, and dissolve it in 190 g of water. While stirring, add the sodium hydroxide solution to the dispersion in step 1 until no turbidity is produced, then stop stirring.

[0054] 3. Wash and purify by suction filtration, with a suction filtration pressure of -0.2MPa and a suction filtration time of 80min. After multiple suction filtration and washing with deionized water, a graphene composite magnetic material precursor is obtained.

[0055] 4. Dry the mixture obtained in step 3 in a vacuum oven.

[0056] 5. The dried mixture was calcined in a high-temperature oven at a calcination temperature of 800°C, a heating rate of 80°C / min, and a holding time of 6h to obtain a graphene composite magnetic material.

[0057] Example 3 1. Weigh 1000g of deionized water and 12g of graphene oxide powder, stir thoroughly to dissolve, then add 10g of polyvinylidene fluoride and 10g of polyacrylonitrile, and continue to stir and disperse. After dispersion, add 4g of ferric chloride and 4g of nickel nitrate, stir at 3000r / min, and stir for 120min until the system is fully dispersed and mixed.

[0058] 2. Weigh 10 g of ammonium carbonate, a pH adjuster, and dissolve it in 190 g of water. While stirring, add the sodium hydroxide solution to the dispersion in step 1 until no turbidity is produced, then stop stirring.

[0059] 3. Wash and purify by suction filtration, with a suction filtration pressure of -0.1 MPa and a suction filtration time of 120 min. After multiple suction filtration and washing with deionized water, a graphene composite magnetic material precursor is obtained.

[0060] 4. Dry the mixture obtained in step 3 in a forced air oven.

[0061] 5. The dried mixture was calcined in a high-temperature oven at a calcination temperature of 800°C, a heating rate of 90°C / min, and a holding time of 12h to obtain a graphene composite magnetic material.

[0062] In the above examples, the self-healing property is evaluated by the degree of indentation repair.

[0063] The specific implementation is as follows: The composite materials obtained in Examples 1 to 3 were made into 5 mm thick films, and then indentations of different depths were pressed at different positions. After 120 hours, the degree of recovery of the indentations was observed under an electron microscope.

[0064] The indentation recovery degrees of Examples 1 to 3 are shown in the table below.

[0065]

[0066] The graphene conductive magnetic material provided by the present invention is prepared by deionized water, graphene, polymer additives and magnetic materials. Graphene is a material with excellent conductive properties and its electron mobility is extremely high, so that the prepared graphene conductive magnetic material has excellent conductive properties; the polymer additive can optimize the dispersion state of graphene in the material, reduce the agglomeration phenomenon between graphene, and thus improve the conductive properties of the material; by adding magnetic materials, the graphene conductive magnetic material can be given electromagnetic properties, so that it can respond to external magnetic fields and provide perception and interaction capabilities for robot electronic skin; the interaction between graphene and magnetic materials can further enhance the electromagnetic properties of the material and improve its sensitivity and response speed to external magnetic fields. The prepared graphene conductive magnetic material can be used as a component of robot electronic skin, providing the robot with perception and interaction capabilities, so that it can better adapt to complex environments. In addition to robot electronic skin, the material can also be applied to other fields that require conductivity, electromagnetic properties and stability, such as sensors, electromagnetic shielding materials, flexible electronic devices, etc.

[0067] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0068] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for preparing a graphene conductive magnetic material, characterized in that: The following steps are involved: S1. Weigh a certain amount of deionized water, graphene, polymer additives and magnetic materials, disperse the graphene and polymer additives in water and stir them thoroughly, add the magnetic material and continue stirring until the system is fully dispersed and mixed to obtain a first mixed solution; S2, weighing a certain amount of pH adjuster and dissolving it in water to obtain a second mixed solution; S3, slowly adding the second mixed solution to the first mixed solution under stirring until no turbidity is generated, stopping stirring, and filtering and purifying to obtain a mixture; S4, drying the mixture in step S3, and calcining the mixture after drying to obtain a graphene magnetic composite material; Among them, the mass ratio of the graphene to water is 1: (10-1000), the mass ratio of the polymer additive to water is 1: (10-1000), the mass ratio of the magnetic material to water is 1: (10-800), and the mass ratio of the pH adjuster to water is 1: (10-300).

2. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The polymer auxiliary agent is selected from one or more of carboxymethyl cellulose, carboxyethyl cellulose, ethyl cellulose, carboxymethyl ethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, cellulose acetate, styrene maleimide resin, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, polyvinylidene fluoride, polyethylene glycol, polyacrylamide, polyacrylic acid, polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylonitrile and polystyrene.

3. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The magnetic material is selected from one or more of iron salts, cobalt salts, nickel-based alloys and rare earth materials.

4. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The pH regulator is selected from one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonium carbonate, sodium carbonate and ammonia water.

5. The method for preparing the graphene conductive magnetic material according to claim 2, characterized in that: The pH value of the second mixed solution ranges from 6.0 to 9.

0.

6. The method for preparing the graphene conductive magnetic material according to claim 3, characterized in that: The iron salt is selected from one or more of ferric chloride, ferric nitrate, ferric oxide, ferrocene and ferric sulfate, and / or, the cobalt salt is selected from one or more of cobalt nitrate, cobalt chloride and cobalt tetroxide, and / or, the nickel-based alloy is selected from one or more of nickel sulfate, nickel chloride and nickel nitrate, and / or, the rare earth material includes ferrite.

7. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The filtration and purification includes using deionized water and / or ethanol for suction filtration and / or centrifugal filtration and / or pressure filtration for washing and purification.

8. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The drying includes freeze drying and / or vacuum oven drying and / or forced air oven drying.

9. The method for preparing the graphene conductive magnetic material according to claim 1, characterized in that: The calcination temperature is 150° C. to 800° C., the heating rate is 0.5° C. / min to 10° C. / min, and the heat preservation time is 0.5h to 12h.

10. A graphene conductive magnetic material, characterized in that: The method is prepared by any one of claims 1 to 9.

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