Graphene modified EVA foaming material and preparation method thereof

Abstract

The invention relates to a graphene modified EVA (ethylene-vinyl acetate) foam material which is prepared from the following components in parts by weight: an ethylene-vinyl acetate copolymer, a foaming agent, a foaming accelerant, a lubricant, filler, a functional graphene multi-component hybrid nano material and a synergist, the number of layers can be stably controlled within 1-4 or 1.7 nm, the sheet diameter size (D50) is 5-8 [mu] m, and the tap density is less than or equal to 0.04 g / m < 2 >; the invention has the following beneficial effects: 1, in subsequent product application, excellent conductivity (10-106 ohm surface resistance), antibacterial activity (staphylococcus aureus / escherichia coli is greater than or equal to 99%, and candida albicans is greater than or equal to 92%) and far infrared heating performance (far infrared emissivity is greater than or equal to 92%) are shown; 2, the mechanical property of the base material can be effectively enhanced (the tensile strength is improved by more than 30%), and the economic added value of the product is further improved;

Description

Technical Field

[0001] This invention relates to the field of polymer modified materials technology, specifically to a graphene-modified EVA foam material and its preparation method. Background Technology

[0002] EVA is an important polymer material that is receiving increasing attention and research due to its excellent properties and wide range of applications (such as midsoles of athletic shoes, packaging of electronic products, and medical devices).

[0003] To improve the overall performance of EVA foam materials, blending, filling, or chemical modification are often used. At the same time, the introduction of nanomaterials to improve their mechanical properties and durability is widely mentioned. The discovery of graphene, due to its large surface area and high reactivity, allows it to be combined with other materials to form nanocomposite materials, which can be used to synergistically enhance and improve the stability between polymer molecules, thereby increasing their added value and further broadening their development and application prospects.

[0004] Currently, most traditional EVA foam materials are modified using graphene oxide. The introduced metal atoms or oxygen-containing functional groups in graphene oxide have to some extent damaged the original properties of graphene (such as electrical properties, mechanical properties, and molecular assembly properties). Its structural defects have a certain impact on the improvement of the mechanical and electrical properties of EVA foam materials. This technical solution is to study the modification of EVA foam materials using graphene prepared by physical methods. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a graphene-modified EVA foam material and its preparation method that can effectively improve the mechanical properties, antistatic properties, and antibacterial and bacteriostatic properties of traditional EVA foam materials.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A graphene-modified EVA foaming material, characterized in that: the foaming material is composed of the following components by weight: 70-80 parts of ethylene-vinyl acetate copolymer, 2-5 parts of foaming agent, 0.5-1.5 parts of foaming accelerator, 0.5-1 part of lubricant, 5-10 parts of filler, 5-15 parts of functional graphene multi-component hybrid nanomaterials, and 1-5 parts of synergist. The functional graphene multi-component hybrid nanomaterials are composed of graphene powder without surface defects prepared by physical methods, nano-silver-zinc composite material, surface modifier, modifier, and solvent. The surface modifier may be mercaptosilane, citric acid, or chitosan. The modifier may be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine, or 4,4'-diaminodiphenyl ether. The resistivity of the graphene powder is ≤10 Ω·cm. -4Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the wafer diameter (D50) is 5um-8um, and the tap density is ≤0.04g / m². 2 .

[0008] As a preferred technical solution, the preparation method of the functional graphene multi-component hybrid nanomaterial is as follows:

[0009] S1: First, mix graphene powder and solvent in a ratio of 2-5:95-98, and then ultrasonically disperse in a water bath with an ultrasonic power of 30kHZ-40kHZ for 30min-40min to prepare graphene mixture 1.

[0010] S2: Place the graphene mixture in S1 into an emulsifier and emulsify it for 60-90 minutes in an emulsifier with a power of 300W-500W. After emulsification for 10 minutes, add the surface modifier and the nano silver-zinc composite material in sequence. The emulsification temperature is 100℃-120℃. After emulsification, graphene mixture 2 is obtained.

[0011] S3: The graphene mixture obtained in S2 was placed in an ice-water bath at 0-10℃, a modifier was added and stirred for 2-3 hours. After stirring, deionized water was added to wash until neutral, and the functional graphene multi-component hybrid nanomaterials were obtained by centrifugation.

[0012] As a preferred technical solution, the foaming agent is azodicarbonamide, and the foaming accelerator can be one or more of zinc citrate, zinc tartrate, acetylated urea, glyceryl urea, nano-sized kaolin, and hydrotalcite, which synergistically enhance the foaming agent.

[0013] As a preferred technical solution, the lubricant may be one or more combinations of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler may be one or more combinations of modified silica, wollastonite powder, calcium carbonate and talc.

[0014] As a preferred technical solution, the synergist may be one or more combinations of boehmite, polysiloxane, or polycarbosilane.

[0015] As a preferred technical solution, the nano-silver-zinc composite material is formed by mixing and dispersing zinc salt and silver salt in a silver-zinc molar ratio of 1:20-1:80.

[0016] As a preferred technical solution, the zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate. During the compounding process, 2-3 times the total molar mass of silver and zinc ions of sodium hydroxide or sodium carbonate and 0.5%-2% of total mass of polyethylene glycol or sodium dodecyl sulfate are added. After precipitation and aging at 50-80℃, the mixture is filtered and calcined at 400-500℃ for 2 hours to obtain the nano-silver-zinc composite material.

[0017] A method for preparing graphene-modified EVA foam material, characterized by comprising the following steps:

[0018] S1: Weigh out the ethylene-vinyl acetate copolymer, functional graphene multi-component hybrid nanomaterials and synergist by weight, and mix them in an internal mixer for 15-30 minutes at a mixing temperature of 150-180℃ to obtain the initial mixture.

[0019] S2: Weigh out the foaming agent, foaming accelerator, lubricant and filler by weight and add them to the internal mixer to mix with the primary mixture for a second internal mixing. The mixing time is 5-8 minutes and the mixing temperature is 120-150℃ to obtain the final mixture.

[0020] S3: After cooling and granulating the final mixture, it is placed in a vulcanizing machine for hot pressing and foaming to obtain graphene-modified EVA foam material.

[0021] The beneficial effects of this invention are: 1. It exhibits excellent conductivity in subsequent product applications (10 3 -10 6 1. It can enhance the surface resistance (Ω), antibacterial and bacteriostatic properties (Staphylococcus aureus / Escherichia coli ≥99%, Candida albicans ≥92%), and far-infrared heating performance (far-infrared emissivity ≥92%); 2. It can effectively enhance the mechanical properties of the substrate (tensile strength increased by more than 30%), thereby increasing the economic added value of the product. Detailed Implementation

[0022] To provide a better understanding of the technical means and effects achieved by this invention, a detailed description is provided using preferred embodiments, as follows:

[0023] Example 1

[0024] A graphene-modified EVA foaming material is disclosed, comprising, by weight, the following components: 80 parts ethylene-vinyl acetate copolymer, 5 parts foaming agent, 1.5 parts foaming accelerator, 1 part lubricant, 5 parts filler, 5 parts functional graphene multi-component hybrid nanomaterials, and 2.5 parts synergist. The functional graphene multi-component hybrid nanomaterials are composed of surface-defect-free graphene powder prepared by physical methods, nano-silver-zinc composite material, surface modifier, modifier, and solvent. The surface modifier may be mercaptosilane, citric acid, or chitosan, and the modifier may be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine, or 4,4'-diaminodiphenyl ether. The resistivity of the graphene powder is ≤10 Ω·cm. -4 Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the wafer diameter (D50) is 5um-8um, and the tap density is ≤0.04g / m². 2 .

[0025] In this embodiment, the preparation method of functional graphene multi-component hybrid nanomaterials is as follows:

[0026] S1: First, mix graphene powder and solvent in a ratio of 2:98, and then ultrasonically disperse in a water bath with an ultrasonic power of 30 kHz-40 kHz for 30 min-40 min to prepare graphene mixture 1.

[0027] S2: Place the graphene mixture in S1 into an emulsifier and emulsify it for 90 minutes in an emulsifier with a power of 500W. After emulsification for 10 minutes, add the surface modifier and the nano silver-zinc composite material in sequence. The emulsification temperature is 120℃. After emulsification, graphene mixture 2 is obtained.

[0028] S3: The graphene mixture obtained in S2 was placed in an ice-water bath at 0-10℃, a modifier was added and stirred for 3 hours. After stirring, deionized water was added to wash until neutral, and the functional graphene multi-component hybrid nanomaterials were obtained by centrifugation.

[0029] In this embodiment, the foaming agent is azodicarbonamide, and the foaming accelerator can be one or more combinations of zinc citrate, zinc tartrate, acetylated urea, glyceryl urea, nano-sized kaolin, and hydrotalcite that synergistically enhance the foaming agent.

[0030] In this embodiment, the lubricant may be one or more combinations of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler may be one or more combinations of modified silica, wollastonite powder, calcium carbonate and talc.

[0031] In this embodiment, the synergist may be one or more combinations of boehmite, polysiloxane, or polycarbosilane.

[0032] In this embodiment, the nano-silver-zinc composite material is formed by mixing and dispersing zinc salt and silver salt at a silver-to-zinc molar ratio of 1:80.

[0033] In this embodiment, the zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate. During the compounding process, sodium hydroxide or sodium carbonate with a total molar mass of 2 times the silver and zinc ions and 2% of the total mass of polyethylene glycol or sodium dodecyl sulfate are added. After precipitation and aging at 80°C, the mixture is filtered and calcined at 500°C for 2 hours to obtain the nano-silver-zinc composite material.

[0034] A method for preparing graphene-modified EVA foam material includes the following steps:

[0035] S1: Weigh out the ethylene-vinyl acetate copolymer, functional graphene multi-component hybrid nanomaterials and synergist by weight, and mix them in an internal mixer for 30 minutes at a mixing temperature of 180℃ to obtain the initial mixture.

[0036] S2: Weigh out the foaming agent, foaming accelerator, lubricant and filler by weight and add them to the internal mixer to mix with the initial mixture for a second internal mixer. The mixing time is 8 minutes and the mixing temperature is 150℃ to obtain the final mixture.

[0037] S3: After cooling and granulating the final mixture, it is placed in a vulcanizing machine for hot pressing and foaming to obtain graphene-modified EVA foam material.

[0038] Example 2

[0039] A graphene-modified EVA foam material is disclosed, comprising, by weight, the following components: 70 parts ethylene-vinyl acetate copolymer, 3 parts foaming agent, 1 part foaming accelerator, 1 part lubricant, 10 parts filler, 10 parts functional graphene multi-component hybrid nanomaterials, and 5 parts synergist. The functional graphene multi-component hybrid nanomaterials are composed of surface-defect-free graphene powder prepared by physical methods, nano-silver-zinc composite material, surface modifier, modifier, and solvent. The surface modifier may be mercaptosilane, citric acid, or chitosan, and the modifier may be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine, or 4,4'-diaminodiphenyl ether. The resistivity of the graphene powder is ≤10 Ω·cm. -4 Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the wafer diameter (D50) is 5um-8um, and the tap density is ≤0.04g / m². 2 .

[0040] In this embodiment, the preparation method of functional graphene multi-component hybrid nanomaterials is as follows:

[0041] S1: First, mix graphene powder and solvent in a ratio of 3:97, and then ultrasonically disperse in a water bath with an ultrasonic power of 30 kHz-40 kHz for 40 min to prepare graphene mixture 1.

[0042] S2: Place the graphene mixture in S1 into an emulsifier and emulsify it for 90 minutes in an emulsifier with a power of 500W. After emulsification for 10 minutes, add the surface modifier and the nano silver-zinc composite material in sequence. The emulsification temperature is 120℃. After emulsification, graphene mixture 2 is obtained.

[0043] S3: The graphene mixture obtained in S2 was placed in an ice-water bath at 0-10℃, a modifier was added and stirred for 3 hours. After stirring, deionized water was added to wash until neutral, and the functional graphene multi-component hybrid nanomaterials were obtained by centrifugation.

[0044] In this embodiment, the foaming agent is azodicarbonamide, and the foaming accelerator can be one or more combinations of zinc citrate, zinc tartrate, acetylated urea, glyceryl urea, nano-sized kaolin, and hydrotalcite that synergistically enhance the foaming agent.

[0045] In this embodiment, the lubricant may be one or more combinations of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler may be one or more combinations of modified silica, wollastonite powder, calcium carbonate and talc.

[0046] In this embodiment, the synergist may be one or more combinations of boehmite, polysiloxane, or polycarbosilane.

[0047] In this embodiment, the nano-silver-zinc composite material is formed by mixing and dispersing zinc salt and silver salt at a silver-to-zinc molar ratio of 1:60.

[0048] In this embodiment, the zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate. During the compounding process, sodium hydroxide or sodium carbonate with a total molar mass of 2 times the silver and zinc ions and 1.5% of polyethylene glycol or sodium dodecyl sulfate are added. After precipitation and aging at 80°C, the mixture is filtered and calcined at 500°C for 2 hours to obtain the nano-silver-zinc composite material.

[0049] A method for preparing graphene-modified EVA foam material includes the following steps:

[0050] S1: Weigh out the ethylene-vinyl acetate copolymer, functional graphene multi-component hybrid nanomaterials and synergist by weight, and mix them in an internal mixer for 20 minutes at a mixing temperature of 180℃ to obtain the initial mixture.

[0051] S2: Weigh out the foaming agent, foaming accelerator, lubricant and filler by weight and add them to the internal mixer to mix with the initial mixture for a second internal mixer. The mixing time is 8 minutes and the mixing temperature is 150℃ to obtain the final mixture.

[0052] S3: After cooling and granulating the final mixture, it is placed in a vulcanizing machine for hot pressing and foaming to obtain graphene-modified EVA foam material.

[0053] Example 3

[0054] A graphene-modified EVA foaming material is disclosed, comprising, by weight, the following components: 75 parts ethylene-vinyl acetate copolymer, 4 parts foaming agent, 1 part foaming accelerator, 0.5 parts lubricant, 12 parts filler, 6 parts functional graphene multi-component hybrid nanomaterials, and 1.5 parts synergist. The functional graphene multi-component hybrid nanomaterials are composed of surface-defect-free graphene powder prepared by physical methods, nano-silver-zinc composite material, surface modifier, modifier, and solvent. The surface modifier may be mercaptosilane, citric acid, or chitosan. The modifier may be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine, or 4,4'-diaminodiphenyl ether. The resistivity of the graphene powder is ≤10 Ω·cm. -4Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the wafer diameter (D50) is 5um-8um, and the tap density is ≤0.04g / m². 2 .

[0055] In this embodiment, the preparation method of functional graphene multi-component hybrid nanomaterials is as follows:

[0056] S1: First, mix graphene powder and solvent in a ratio of 4:96, and then ultrasonically disperse them in a water bath with an ultrasonic power of 30 kHz for 30 min to prepare graphene mixture 1.

[0057] S2: Place the graphene mixture in S1 into an emulsifier and emulsify it for 70 minutes in an emulsifier with a power of 400W. After emulsification for 10 minutes, add the surface modifier and the nano silver-zinc composite material in sequence. The emulsification temperature is 110℃. After emulsification, graphene mixture 2 is obtained.

[0058] S3: The graphene mixture obtained in S2 was placed in an ice-water bath at 0-10℃, a modifier was added and stirred for 2 hours. After stirring, deionized water was added to wash until neutral, and the functional graphene multi-component hybrid nanomaterials were obtained by centrifugation.

[0059] In this embodiment, the foaming agent is azodicarbonamide, and the foaming accelerator can be one or more combinations of zinc citrate, zinc tartrate, acetylated urea, glyceryl urea, nano-sized kaolin, and hydrotalcite that synergistically enhance the foaming agent.

[0060] In this embodiment, the lubricant may be one or more combinations of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler may be one or more combinations of modified silica, wollastonite powder, calcium carbonate and talc.

[0061] In this embodiment, the synergist may be one or more combinations of boehmite, polysiloxane, or polycarbosilane.

[0062] In this embodiment, the nano-silver-zinc composite material is formed by mixing and dispersing zinc salt and silver salt at a silver-to-zinc molar ratio of 1:50.

[0063] In this embodiment, the zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate. During the compounding process, sodium hydroxide or sodium carbonate with a total molar mass of 2 times the silver and zinc ions and 0.5% of polyethylene glycol or sodium dodecyl sulfate are added. After precipitation and aging at 50°C, the mixture is filtered and calcined at 400°C for 2 hours to obtain the nano-silver-zinc composite material.

[0064] A method for preparing graphene-modified EVA foam material includes the following steps:

[0065] S1: Weigh out the ethylene-vinyl acetate copolymer, functional graphene multi-component hybrid nanomaterials and synergist by weight, and mix them in an internal mixer for 15 minutes at a mixing temperature of 150℃ to obtain the initial mixture.

[0066] S2: Weigh out the foaming agent, foaming accelerator, lubricant and filler by weight and add them to the internal mixer to mix with the initial mixture for a second internal mixing. The mixing time is 5 minutes and the mixing temperature is 120℃ to obtain the final mixture.

[0067] S3: After cooling and granulating the final mixture, it is placed in a vulcanizing machine for hot pressing and foaming to obtain graphene-modified EVA foam material.

[0068] Example 4

[0069] A graphene-modified EVA foaming material is disclosed, comprising, by weight, the following components: 70 parts ethylene-vinyl acetate copolymer, 2 parts foaming agent, 0.5 parts foaming accelerator, 1 part lubricant, 15 parts filler, 8 parts functional graphene multi-component hybrid nanomaterials, and 3.5 parts synergist. The functional graphene multi-component hybrid nanomaterials are composed of surface-defect-free graphene powder prepared by physical methods, nano-silver-zinc composite material, surface modifier, modifier, and solvent. The surface modifier may be mercaptosilane, citric acid, or chitosan, and the modifier may be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine, or 4,4'-diaminodiphenyl ether. The resistivity of the graphene powder is ≤10 Ω·cm. -4 Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the wafer diameter (D50) is 5um-8um, and the tap density is ≤0.04g / m². 2 .

[0070] In this embodiment, the preparation method of functional graphene multi-component hybrid nanomaterials is as follows:

[0071] S1: First, mix graphene powder and solvent in a ratio of 5:95, and then ultrasonically disperse in a water bath with an ultrasonic power of 30 for 30 minutes to prepare graphene mixture 1.

[0072] S2: Place the graphene mixture in S1 into an emulsifier and emulsify it for 60 minutes in an emulsifier with a power of 300W. After emulsification for 10 minutes, add the surface modifier and the nano silver-zinc composite material in sequence. The emulsification temperature is 100℃. After emulsification, graphene mixture 2 is obtained.

[0073] S3: The graphene mixture obtained in S2 was placed in an ice-water bath at 0-10℃, a modifier was added and stirred for 2 hours. After stirring, deionized water was added to wash until neutral, and the functional graphene multi-component hybrid nanomaterials were obtained by centrifugation.

[0074] In this embodiment, the foaming agent is azodicarbonamide, and the foaming accelerator can be one or more combinations of zinc citrate, zinc tartrate, acetylated urea, glyceryl urea, nano-sized kaolin, and hydrotalcite that synergistically enhance the foaming agent.

[0075] In this embodiment, the lubricant may be one or more combinations of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler may be one or more combinations of modified silica, wollastonite powder, calcium carbonate and talc.

[0076] In this embodiment, the synergist may be one or more combinations of boehmite, polysiloxane, or polycarbosilane.

[0077] In this embodiment, the nano-silver-zinc composite material is formed by mixing and dispersing zinc salt and silver salt at a silver-to-zinc molar ratio of 1:20.

[0078] In this embodiment, the zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate. During the compounding process, sodium hydroxide or sodium carbonate with a total molar mass of 2 times the silver and zinc ions and 0.5% of polyethylene glycol or sodium dodecyl sulfate are added. After precipitation and aging at 50°C, the mixture is filtered and calcined at 400°C for 2 hours to obtain the nano-silver-zinc composite material.

[0079] A method for preparing graphene-modified EVA foam material includes the following steps:

[0080] S1: Weigh out the ethylene-vinyl acetate copolymer, functional graphene multi-component hybrid nanomaterials and synergist by weight, and mix them in an internal mixer for 15 minutes at a mixing temperature of 150℃ to obtain the initial mixture.

[0081] S2: Weigh out the foaming agent, foaming accelerator, lubricant and filler by weight and add them to the internal mixer to mix with the initial mixture for a second internal mixing. The mixing time is 5 minutes and the mixing temperature is 120℃ to obtain the final mixture.

[0082] S3: After cooling and granulating the final mixture, it is placed in a vulcanizing machine for hot pressing and foaming to obtain graphene-modified EVA foam material.

[0083] The surface resistivity, tensile strength, antibacterial and bacteriostatic properties of Examples 1-4 were tested respectively, and the results are as follows:

[0084]

[0085] The aforementioned far-infrared performance and antibacterial and bacteriostatic effects were all tested after the EVA plastic products were manufactured. The antibacterial and bacteriostatic effects were based on QB / T 2881-2013 <Technical Conditions for Antibacterial Performance of Footwear and Footwear Components>. Compared with traditional EVA foam materials, it has better antibacterial and bacteriostatic effects against the three major bacteria. The far-infrared performance was measured by a far-infrared spectrometer to determine the ability of the product to emit far-infrared rays (wavelength 4-14um) under specific conditions. The emissivity and irradiation temperature rise were both higher than the test standards.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A graphene modified EVA foamed material, characterized in that: The foaming material is composed of the following components by weight parts: ethylene-vinyl acetate copolymer 70-80 parts, foaming agent 2-5 parts, foaming promoter 0.5-1.5 parts, lubricant 0.5-1 part, filler 5-10 parts, functional graphene multi-element hybrid nanomaterial 5-15 parts, and synergist 1-5 parts, the functional graphene multi-element hybrid nanomaterial is composed of surface defect-free graphene powder prepared by physical method, nano silver zinc composite material, surface modifier, modifier and solvent, wherein the surface modifier can be mercapto silane, citric acid or chitosan, the modifier can be aniline, p-toluidine, p-phenylenediamine, m-phenylenediamine or 4,4'-diamino diphenyl ether, the resistivity of the graphene powder is ≤10 -4 Ω·m, the number of layers can be stably controlled within 1-4 layers or 1.7nm, the flake size (D50) is 5um-8um, the tap density is ≤0.04g / m 2 .

2. The graphene modified EVA foamed material according to claim 1, characterized in that: The preparation method of the functional graphene multi-element hybrid nanomaterial is as follows: S1: firstly, graphene powder is mixed with a solvent at a ratio of 2-5:95-98, and ultrasonic dispersion is carried out in a water bath with an ultrasonic power of 30-40 kHz for 30-40 min to prepare graphene mixed solution 1; S2: the graphene mixed solution in S1 is placed in an emulsifier, and emulsification is carried out in the emulsifier with a power of 300-500 W for 60-90 min; after emulsification for 10 min, a surface modifier and a nano silver-zinc composite material are sequentially added, and the emulsification temperature is 100-120 DEG C; after emulsification is completed, graphene mixed solution 2 is prepared; S3: the graphene mixed solution prepared in S2 is placed in an ice water bath at 0-10 DEG C, a modifier is added, and stirring is carried out for 2-3 h; after stirring is completed, deionized water is added for washing until neutral; after centrifugal separation, a functional graphene multi-element hybrid nanomaterial is obtained. 3.The graphene modified EVA foamed material according to claim 1, characterized in that: The foaming agent is azodicarbonamide, and the foaming promoter can be one or more of zinc citrate, zinc tartrate, acetyl urea, glycerol urea, nanoscale kaolin and hydrotalcite in combination with the foaming agent. 4.The graphene modified EVA foamed material according to claim 1, characterized in that: The lubricant can be one or more of stearic acid, butyl stearate, polyethylene wax, dibutyl phthalate and dioctyl adipate, and the filler can be one or more of modified silicon dioxide, wollastonite powder, calcium carbonate and talc powder.

5. The graphene modified EVA foamed material according to claim 1, characterized in that: The synergist can be one or more of boehmite, polysiloxane or polycarbosilane.

6. The graphene modified EVA foamed material according to claim 2, characterized in that: The nano silver-zinc composite material is prepared by mixing and dispersing zinc salt and silver salt at a silver to zinc molar ratio of 1:20-1:

80.

7. The graphene modified EVA foam material according to claim 6, characterized in that: The zinc salt can be zinc carbonate or zinc nitrate, and the silver salt can be silver chloride or silver nitrate; during the mixing process, 2-3 times the total molar mass of silver and zinc ions of sodium hydroxide or sodium carbonate and 0.5-2% of the total mass of polyethylene glycol or sodium dodecyl sulfate are added, and after precipitation and aging at 50-80 DEG C, filtration and calcination at 400-500 DEG C for 2 h, the nano silver-zinc composite material is prepared.

8. The method of claim 1-7, wherein the graphene modified EVA foam material is prepared by the following steps: 1) mixing graphene and EVA to form a mixture; 2) adding the mixture into a foaming device; 3) foaming the mixture to form a graphene modified EVA foam material. The method comprises the following steps: S1: ethylene-vinyl acetate copolymer, functional graphene multi-element hybrid nanomaterial and synergist are weighed by weight parts and are mixed and blended in an internal mixer for 15-30 min, and the mixing temperature is 150-180 DEG C to obtain a preliminary mixture; S2: foaming agent, foaming promoter, lubricant and filler are weighed by weight parts and are added to the internal mixer to blend with the preliminary mixture for secondary mixing, and the mixing time is 5-8 min and the mixing temperature is 120-150 DEG C to obtain a final mixture; S3: the final mixture is cooled and granulated and then placed in a vulcanizing machine for hot pressing and foaming to obtain a graphene modified EVA foaming material.

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