Hybrid antistatic EPDM composite foam material and preparation method thereof

Abstract

The invention discloses a hybrid antistatic EPDM (Ethylene-Propylene-Diene Monomer) composite foam material and a preparation method thereof, and belongs to the field of polymer composite foam materials. The hybrid antistatic EPDM composite foam material comprises the following components in parts by weight: 80-90 parts of EPDM particles, 10-20 parts of EVA particles, 7-12 parts of an antistatic hybrid composite filler, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of a foaming agent azodicarbonamide, 0.5 part of a cross-linking agent dicumyl peroxide and 2-4 parts of talcum powder. Wherein the antistatic hybrid composite filler is obtained by firstly preparing acidified carbon fiber loaded zirconium dioxide from acidified carbon fiber and zirconium dioxide and then compounding and combining with graphene oxide prepared by utilizing an improved Hummers method. The hybrid antistatic EPDM composite foaming material is prepared from the antistatic hybrid composite filler and EPDM by adopting a double-roller open milling and mold pressing foaming method, the formula is scientific and reasonable, and the technological process is simple and practical; the prepared hybrid antistatic filler is good in compatibility with a matrix, uniform in dispersion and excellent in antistatic effect, and has excellent mechanical properties.

Description

Technical Field

[0001] The invention belongs to the field of polymer composite foam materials, and in particular relates to a hybrid antistatic EPDM composite foam material and a preparation method thereof. Background Art

[0002] Ethylene propylene diene monomer (EPDM) is a copolymer obtained by curing and granulating ethylene, propylene and a small amount of a third monomer. It is a type of ethylene propylene rubber. According to the different third monomers added, EPDM can be divided into the following three types: 1,4-hexadiene type, dicyclopentadiene type and ethylidene norbornene type. Its molecular structure is linear and double bonds are introduced in its side chain, so it can be vulcanized with sulfur or peroxides such as diisopropylbenzene peroxide; according to the different propylene content in EPDM, it can be divided into high propylene, medium propylene and low propylene types. At the same time, the higher the propylene content in the main body, the more the elastic properties and mechanical properties of EPDM vulcanizate decrease. The main chain of the polymer is composed of soft segments and hard segments. Among the many types of synthetic rubber materials, EPDM shows the high elasticity of traditional rubber at room temperature, and has the plasticity of ordinary plastics at high temperatures, and has the characteristics of both plastics and rubber. EPDM has high production efficiency and can use common processing technologies for thermoplastics, such as melt blending and extrusion molding. EPDM has excellent chemical stability, electrical insulation, aging resistance and waterproof performance, good ductility, high strength and high filling and plasticizing ability. It is now widely used in automotive engineering, construction engineering, air conditioning, refrigeration and other industries.

[0003] However, EPDM has a very serious static problem during use, and its volume resistivity is generally 10 16 The extremely poor conductivity of EPDM material itself needs to be improved so that it can be used in more aspects. It is necessary to modify the EPDM material to have a certain antistatic function. The addition of antistatic agent can form a conductive network inside the EPDM rubber matrix, so that the accumulated charge can be released faster through the conductive network, thereby improving the static electricity phenomenon. Summary of the invention

[0004] The object of the present invention is to provide a hybrid antistatic EPDM composite foam material, which has good antistatic effect and processing performance.

[0005] To achieve the above object, the present invention adopts the following technical solution: A hybrid antistatic EPDM composite foaming material comprises, by weight, 80-90 parts of EPDM particles, 10-20 parts of EVA particles, 7-12 parts of antistatic hybrid composite fillers, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of azodicarbonamide as a foaming agent, 0.5 parts of dicumyl peroxide as a crosslinking agent, and 2-4 parts of talc.

[0006] Furthermore, the antistatic hybrid composite filler is prepared by compounding acidified carbon fiber-loaded zirconium dioxide oCF@ZrO2 and graphene oxide GO in a mass ratio of 1:1.

[0007] Furthermore, the preparation steps of the acidified carbon fiber loaded zirconium dioxide oCF@ZrO2 are as follows: (1) Preparation of acidified carbon fiber oCF: 35 mL of 98% concentrated sulfuric acid and 15 mL of 68% concentrated nitric acid were mixed, and 4 g of carbon fiber was added to react for 4 h. After centrifugation, the precipitate was vacuum dried at 60 °C for 12 h, and oCF was obtained after grinding. (2) Preparation of acidified carbon fiber loaded zirconium dioxide oCF@ZrO2: After adding carbon fiber to deionized water, ultrasonically oscillate at 25°C until uniformly dispersed, and then transfer to a 60°C water bath for magnetic stirring; then slowly add zirconium dioxide in batches, and continue stirring in a 60°C water bath for 6 hours, then continue stirring at room temperature for 4 hours and let stand overnight; finally, the reaction mixture is centrifuged and dried to obtain acidified carbon fiber loaded zirconium dioxide oCF@ZrO2.

[0008] In step (2), the usage ratio of carbon fiber, zirconium dioxide and deionized water is 2:1:100 mL.

[0009] The drying temperature in step (2) is 60° C. and the drying time is 12 h.

[0010] The preparation method of the graphene oxide GO is as follows: weigh 1g of flake graphite and add it to 60mL of 98% concentrated sulfuric acid, stir and react at room temperature for 30min, then heat to 40°C, slowly add 5g of potassium permanganate in batches, slowly add 100mL of deionized water after reacting for 6h, and heat to 80°C at the same time, then add 5% hydrogen peroxide solution dropwise until the system turns yellow and no bubbles emerge; then add 25mL of 30% hydrochloric acid into the system, and finally add deionized water to 1L of the mixed liquid, let it stand for 12h, centrifuge and wash until the solution is neutral, and then freeze-dry it in a freeze dryer for 48h to obtain graphene oxide GO.

[0011] The present invention also provides a method for preparing the hybrid antistatic EPDM composite foam material, comprising the following steps: (1) EPDM particles, EVA particles, antistatic hybrid composite filler, zinc oxide, stearic acid, foaming agent azodicarbonamide, crosslinking agent diisopropylbenzene peroxide and talcum powder are uniformly mixed on a preheated two-roll mill for 10-20 minutes at a heating temperature of 50-60°C. After the rubber materials are completely mixed, they are thinly passed 4-6 times to obtain 2-4 mm rubber sheets.

[0012] (2) After the rubber sheet obtained in step (1) is air-dried for 4-6 hours, it is placed in the mold cavity of a preheated flat-plate molding machine, and molded and foamed for 450 seconds at 175° C. and 10 MPa. After cooling, a hybrid antistatic EPDM composite foam material can be obtained.

[0013] The beneficial effects of the present invention are: The acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 and graphene oxide GO prepared by the present invention and their application in EPDM composite foaming materials have a scientific and reasonable formula and a simple and practical process flow. The surface-acidified carbon fiber is prepared in a relatively green and environmentally friendly manner, and zirconium dioxide is loaded on the surface of the acidified carbon fiber to successfully prepare the acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2. At the same time, the improved Hummers method is used to prepare graphene oxide GO, and the two are combined to obtain an antistatic hybrid filler. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the SEM image of the acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 prepared in the present invention.

[0015] Figure 2 This is a SEM image of graphene oxide GO prepared in the present invention.

[0016] Figure 3 This is the FTIR graph of the acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 prepared in the present invention.

[0017] Figure 4 This is the SEM image of Example 3 of the hybrid antistatic EPDM foam material prepared in the present invention. DETAILED DESCRIPTION

[0018] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods, but the present invention is not limited thereto.

[0019] The materials in the following embodiments can all be purchased from the market; EPDM particles are purchased from DuPont, USA, and EVA particles are purchased from Formosa Plastics Group; the carbon fiber is carbon fiber powder, with a single filament diameter of 5 μm and a mesh size of 300 meshes.

[0020] A method for preparing acidified carbon fiber loaded zirconium dioxide oCF@ZrO2 comprises the following steps: 1) Preparation of acidified carbon fiber oCF: Mix 35 mL of 98% concentrated sulfuric acid and 15 mL of 68% concentrated nitric acid, add 4 g of carbon fiber, fully acidify for 4 hours, centrifuge and precipitate, vacuum dry at 60 ° C for 12 hours, grind and obtain oCF for use; 2) Preparation of acidified carbon fiber loaded zirconium dioxide oCF@ZrO2: Weigh 4g of acidified carbon fiber oCF and add it to a 200mL deionized water beaker, ultrasonically oscillate at 25°C until evenly dispersed, transfer the beaker to a 60°C water bath, and continue magnetic stirring; then weigh 2g of zirconium dioxide and slowly add it to the previous mixed liquid in batches of 0.5g each time, and continue stirring the reaction in a 60°C water bath for 6h, then take the beaker out of the water bath and continue stirring for 4h and then let it stand overnight; finally, the reaction mixture is centrifuged to obtain a gray precipitate, and the obtained gray precipitate is placed in a 60°C vacuum drying oven and dried for 12h to obtain the acidified carbon fiber loaded zirconium dioxide oCF@ZrO2.

[0021] An improved Hummers method for preparing graphene oxide comprises the following steps: Graphene oxide was prepared by the improved Hummers method: 1 g of flake graphite was weighed and added to 60 mL of 98% concentrated sulfuric acid, stirred and reacted at room temperature for 30 min, then heated to 40 °C, and then 5 g of potassium permanganate was weighed and added to a beaker in batches slowly, with 0.1 g, 0.2 g, 0.3 g, 0.4 g, 0.5 g, 0.5 g, 0.5 g… added once every 10 min, and it was completely added to the beaker in about 2 h; reacted for 6 h until the solution became viscous; then 100 mL of deionized water was slowly added to dilute the reaction solution, and the temperature was raised to 80 °C, and then 5% hydrogen peroxide aqueous solution was added dropwise until the system turned yellow and no bubbles emerged; then 25 mL of 30% hydrochloric acid was added to the system, and finally deionized water was added to the mixed liquid to 1 L, and after standing for 12 h, it was washed and centrifuged until the solution was neutral, and then freeze-dried in a freeze dryer for 48 h to obtain graphene oxide GO. Finally, the prepared acidified carbon fiber loaded zirconium dioxide oCF@ZrO2 and graphene oxide GO are uniformly mixed in a mass ratio of 1:1 to obtain an antistatic hybrid composite filler.

[0022] Figure 1 The SEM image of the acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 prepared by the present invention shows that the prepared acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 does not show an agglomerated state, and zirconium dioxide particles loaded thereon can be clearly seen on the surface of the acidified carbon fiber, with a high loading amount and uniform distribution. Figure 2This is a SEM image of the graphene oxide GO prepared in the present invention. It can be seen that the prepared graphene oxide GO is in the form of wrinkled nanosheets. Figure 3 The FTIR image of the acidified carbon fiber loaded with zirconium dioxide oCF@ZrO2 prepared in the present invention is shown at 3420 cm -1 There is an obvious hydroxyl characteristic peak at 1635cm -1 、1590cm -1 、1093cm -1 The characteristic peaks caused by carbon-oxygen double bonds, carbon-oxygen single bonds and conjugated carbon-carbon double bonds belonging to carbon fibers appeared at 512 cm -1 The Zr-O characteristic peak belonging to ZrO2 appeared, indicating that zirconium dioxide was successfully attached to the surface of the acidified carbon fiber oCF.

[0023] Example 1 A method for preparing a hybrid antistatic EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 7 parts of antistatic hybrid composite filler, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The thin sheet prepared in step 1) is placed in the preheated film cavity of a flat vulcanizer, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain a hybrid antistatic EPDM foam material.

[0024] Example 2 A method for preparing a hybrid antistatic EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 10 parts of antistatic hybrid filler, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizer film cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain a hybrid antistatic EPDM foam material.

[0025] Example 3 A method for preparing a hybrid antistatic EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 12 parts of antistatic hybrid filler, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizer film cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain a hybrid antistatic EPDM foam material.

[0026] Figure 4 This is the SEM image of Example 3 of the hybrid antistatic EPDM foam material prepared by the present invention. From the image, it can be seen that the pore distribution of the hybrid antistatic EPDM foam material prepared by the present invention is relatively uniform, and the prepared hybrid antistatic composite filler has good dispersion therein.

[0027] Comparative Example 1 A method for preparing an EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizing machine cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain an EPDM composite foam material.

[0028] Comparative Example 2 A method for preparing an EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 10 parts of carbon fiber, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizing machine cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain an EPDM composite foam material.

[0029] Comparative Example 3 A method for preparing an EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 10 parts of conductive carbon black, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder were mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials were evenly mixed. After the raw materials were fully mixed, the mixed raw materials were pressed into 4 mm thin slices using a double-roll mill, and the raw material slices were placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizing machine cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain an EPDM composite foam material.

[0030] Comparative Example 4 A method for preparing an EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 10 parts of antistatic filler (acidified carbon fiber oCF and graphene oxide GO are obtained in a mass ratio of 1:1, wherein graphene oxide GO is prepared by the Hammers method), 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of cross-linking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder are mixed at 50°C for 20 minutes using a preheated double-roll mill until all the raw materials are evenly mixed. After the raw materials are fully mixed, the mixed raw materials are pressed into 4 mm thin sheets using a double-roll mill, and the raw material sheets are placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizing machine cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain an EPDM composite foam material.

[0031] Comparative Example 5 A method for preparing an EPDM composite foam material comprises the following steps: 1) 80 parts of EPDM particles, 20 parts of EVA particles, 10 parts of antistatic filler (unacidified carbon fiber CF and graphene oxide GO are obtained in a mass ratio of 1:1, wherein the graphene oxide GO is prepared by the Hammers method of the present invention), 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of foaming agent AC (azodicarbonamide), 0.5 parts of crosslinking agent DCP (diisopropylbenzene peroxide), and 4 parts of talcum powder are mixed at 50° C. for 20 minutes using a preheated double-roll mill until all the raw materials are uniformly mixed. After the raw materials are fully mixed, the mixed raw materials are pressed into 4 mm thin slices using a double-roll mill, and the raw material slices are placed in a blast drying oven and dried for 5 hours; 2) The sheet prepared in step 1) is placed in a preheated flat vulcanizing machine cavity, and is molded and foamed for 450 seconds under the conditions of 10 MPa and 175° C., and then taken out to obtain an EPDM composite foam material.

[0032] The samples obtained in the embodiments and comparative examples were subjected to performance tests, and the results are shown in Table 1.

[0033] Table 1 Sample performance test results The data in Table 1 show that when the addition amount of hybrid antistatic composite filler reaches 10 parts, the resistance of the sample can be reduced to 1.67×10 8 Ω, reaching the range of antistatic materials. When the addition amount of hybrid antistatic composite filler reaches 12 parts, the resistance of the sample can be reduced to 7.90×10 7Ω. And with the increase of the amount of hybrid antistatic composite filler added, the tensile strength and elongation at break of the sample are also improved to a certain extent, which shows that the hybrid antistatic composite filler used in the present invention can also effectively improve the mechanical properties of the sample. At the same time, compared with Comparative Example 1 without adding hybrid antistatic composite filler, Comparative Example 2 with only 10 parts by weight of carbon fiber added, and Comparative Example 3 with only 10 parts by weight of conductive carbon black added, the antistatic effect of the hybrid antistatic EPDM foam material prepared in Example 2 is significantly improved, indicating that the prepared antistatic hybrid composite filler is synergistically antistatic, and a three-dimensional hybrid conductive network is built by the interlacing of zirconium dioxide loaded by acidified carbon fiber in the foaming material and the stacking effect of graphene oxide in the composite foaming material, which is closely combined with the matrix material, achieving the effect of 1+1>2. In addition, compared with the comparative example 4 in which 10 parts of acidified carbon fiber and graphene oxide prepared by the ordinary Hammers method (mass ratio 1:1) were added and the comparative example 5 in which the carbon fiber was not acidified and graphene oxide prepared by the improved Hammers method (mass ratio 1:1), the resistance of Example 2 was still greatly reduced, indicating that the graphene oxide prepared by the improved Hammers method and the acidification of the carbon fiber have a good improvement effect on the antistatic effect of the EPDM foam material, and also have a certain improvement in the mechanical properties. Figure 4 It can be clearly seen that the antistatic hybrid composite filler prepared by the present invention can be well dispersed in the EPDM-EVA composite foam material, so that the prepared final product has excellent antistatic effect and mechanical properties.

[0034] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A hybrid antistatic EPDM composite foam material, characterized in that: The hybrid antistatic EPDM composite foaming material comprises, by weight, 80-90 parts of EPDM particles, 10-20 parts of EVA particles, 7-12 parts of antistatic hybrid composite fillers, 2 parts of zinc oxide, 2 parts of stearic acid, 7 parts of azodicarbonamide as a foaming agent, 0.5 parts of diisopropylbenzene peroxide as a crosslinking agent, and 2-4 parts of talc.

2. The hybrid antistatic EPDM composite foam material according to claim 1, characterized in that: The antistatic hybrid composite filler is prepared by compounding acidified carbon fiber-loaded zirconium dioxide oCF@ZrO2 and graphene oxide GO in a mass ratio of 1:

1.

3. The hybrid antistatic EPDM composite foam material according to claim 2, characterized in that: The preparation steps of the acidified carbon fiber loaded zirconium dioxide oCF@ZrO2 are as follows: (1) Preparation of acidified carbon fiber oCF: 35 mL of 98% concentrated sulfuric acid and 15 mL of 68% concentrated nitric acid were mixed, and 4 g of carbon fiber was added to react for 4 h. After centrifugation, the precipitate was vacuum dried at 60 °C for 12 h, and oCF was obtained after grinding. (2) Preparation of acidified carbon fiber loaded zirconium dioxide oCF@ZrO2: After adding carbon fiber to deionized water, ultrasonically oscillate at 25°C until uniformly dispersed, and then transfer to a 60°C water bath for magnetic stirring; then slowly add zirconium dioxide in batches, and continue stirring in a 60°C water bath for 6 hours, then continue stirring at room temperature for 4 hours and let stand overnight; finally, the reaction mixture is centrifuged and dried to obtain acidified carbon fiber loaded zirconium dioxide oCF@ZrO2.

4. The hybrid antistatic EPDM composite foam material according to claim 3, characterized in that: In step (2), the usage ratio of carbon fiber, zirconium dioxide and deionized water is 2:1:100 mL.

5. The hybrid antistatic EPDM composite foam material according to claim 3, characterized in that: The drying temperature in step (2) is 60° C. and the drying time is 12 h.

6. The hybrid antistatic EPDM composite foam material according to claim 2, characterized in that: The preparation method of the graphene oxide GO is as follows: weigh 1g of flake graphite and add it to 60mL of 98% concentrated sulfuric acid, stir and react at room temperature for 30min, then heat to 40°C, slowly add 5g of potassium permanganate in batches, slowly add 100mL of deionized water after reacting for 6h, and heat to 80°C at the same time, then add 5% hydrogen peroxide solution dropwise until the system turns yellow and no bubbles emerge; then add 25mL of 30% hydrochloric acid into the system, and finally add deionized water to 1L of the mixed liquid, stand for 12h, centrifuge and wash until the solution is neutral, and then freeze-dry for 48h in a freeze dryer to obtain graphene oxide GO.

7. The method for preparing the hybrid antistatic EPDM composite foam material according to claim 1, characterized in that: The following steps are involved: (1) EPDM particles, EVA particles, antistatic hybrid composite filler, zinc oxide, stearic acid, foaming agent azodicarbonamide, crosslinking agent diisopropylbenzene peroxide and talcum powder are uniformly mixed on a preheated two-roll mill for 10-20 minutes at a heating temperature of 50-60°C. After the rubber material is completely mixed, it is thinly passed 4-6 times to obtain a 2-4 mm rubber sheet; (2) After the rubber sheet obtained in step (1) is air-dried for 4-6 hours, it is placed in the mold cavity of a preheated flat-plate molding machine, and molded and foamed for 450 seconds at 175° C. and 10 MPa. After cooling, a hybrid antistatic EPDM composite foam material can be obtained.

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