High-damping EVA / EPDM composite foam material and preparation method thereof

Abstract

The invention relates to the technical field of foaming materials, in particular to a high-damping EVA / EPDM composite foaming material and a preparation method thereof. The high-damping EVA / EPDM composite foam material is prepared from the following raw materials in parts by weight: 150 to 80 parts of ethylene-vinyl acetate copolymer, 20 to 50 parts of ethylene propylene diene monomer, 3 to 5 parts of azodicarbonamide, 1 to 3 parts of dicumyl peroxide, 10 to 12 parts of compound filler, 6 to 10 parts of maleic anhydride grafted ethylene-octylene copolymer, 2 to 4 parts of hydroxyl-terminated polybutadiene and 1 to 4 parts of triallyl isocyanurate, the compound filler is formed by compounding silicon dioxide microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles according to the mass ratio of 1: (1.5-1.7): (1.5-1.8); the high-damping EVA / EPDM composite foam material prepared by the invention not only has better high-damping and low-resilience properties, but also has excellent tensile strength, and the quality of the high-damping EVA / EPDM composite foam material is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of foam materials, in particular to a high-damping EVA / EPDM composite foam material and a preparation method thereof. Background Art

[0002] Foam materials, due to their low thermal conductivity, good shock absorption, and flexibility, are widely used in a wide range of fields, including aerospace, automotive, construction, footwear, and packaging. In the automotive industry, for example, they can be used to manufacture sound insulation and shock-absorbing components; in construction, they are often used as thermal insulation and sound absorption materials; in footwear, they provide a comfortable feel and shock absorption; and in packaging, they protect products.

[0003] In the patent document with application number "CN202211426059.8" and name "A bio-based foaming material and its preparation method", a bio-based foaming material and its preparation method are disclosed, whose components include biomass materials, foaming materials and foaming aids, the biomass materials include thermoplastic starch, modified rice straw powder and modified shell powder; the foaming materials include EVA, EPDM and LLDPE; thermoplastic starch, rice straw powder and shell powder are all biomass materials, but thermoplastic starch is the main material, which is a thermoplastic material. Blending and plasticization with EVA, EPDM and LLDPE is more conducive to improving the melt strength of the material and is more conducive to foaming, while modified rice straw powder and modified shell powder play a more supporting role in the material. Through the synergistic effect of biomass materials, foaming materials and foaming aids, while increasing the biomass content, the foaming material pores are uniform and the foaming ratio is appropriate. The biomass content in the bio-based foaming material can reach 56-66%.

[0004] Although the foam materials produced by the above patent documents have certain advantages such as tensile strength, their damping performance is relatively insufficient and still needs further improvement. Based on this, the present invention provides a high-damping EVA / EPDM composite foam material and a preparation method thereof to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-damping EVA / EPDM composite foam material and a preparation method thereof. The prepared high-damping EVA / EPDM composite foam material not only has good high damping and low rebound properties, but also has excellent tensile strength properties, effectively ensuring its quality.

[0006] To achieve the above object, the present invention provides the following technical solutions: The first aspect of the present invention provides a high-damping EVA / EPDM composite foam material, which is composed of the following raw materials in parts by weight: 50-80 parts of ethylene-vinyl acetate copolymer, 20-50 parts of ethylene propylene diene monomer rubber, 3-5 parts of azodicarbonamide, 1-3 parts of dicumyl peroxide, 10-12 parts of composite filler, 6-10 parts of maleic anhydride grafted ethylene-octene copolymer, 2-4 parts of hydroxyl-terminated polybutadiene and 1-4 parts of triallyl isocyanurate; The composite filler is prepared by compounding silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.5-1.7:1.5-1.8; The preparation process of the modified barium titanate nanoparticles is as follows: placing barium titanate nanoparticles in a sodium dodecyl sulfate aqueous solution under high shear to obtain a first preformulation; After 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene was melted, 1,6-hexanediol diacrylate was added thereto in a constant temperature water bath at 60°C, and then 2-cyano-2-propyldodecyl trithiocarbonate was added and mixed uniformly to obtain a second preformulation; The first preformulation and the second preformulation are mixed homogeneously in a volume ratio of 1:3.2-3.5, and then an aqueous solution of azobisisobutylamidine hydrochloride is added. The mixture is heated and stirred, and after heat preservation and aging, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is added. Then, the mixture is ultraviolet-cured, centrifuged and washed, and freeze-dried to obtain modified barium titanate nanoparticles.

[0007] The present invention is further configured as follows: the preparation process of the silica microspheres is as follows: The porous silica microspheres were placed in a sodium hydroxide solution with a volume concentration of 2.5 to 3 mol / L at a dosage of 0.05 to 0.2 g / mL, treated at 75 to 80°C for 60 to 70 minutes, washed until neutral, and dried. The microspheres were then immersed in a 0.1% polydiallyldimethylammonium chloride aqueous solution and shaken at 40°C for 20 to 30 minutes. After filtration and drying, the mixture was immersed in a ferrocene compound solution for 30 to 40 minutes, and then dried under vacuum conditions at 60 to 70°C to a constant weight to obtain prefabricated microspheres; The prefabricated microspheres were placed in a heating box, hydrogen and nitrogen were introduced, air was exhausted, the temperature was raised to 450° C., and the treatment was carried out for 30 to 35 minutes, wherein the flow rate of hydrogen and nitrogen was 200 sccm, then the hydrogen and nitrogen were cut off, acetylene and hydrogen were introduced into the heating box at a flow ratio of 1:3 to 4, wherein the flow rate of acetylene was 50 to 100 sccm, and the temperature was raised to 680° C. and treated for 5 to 10 minutes, acetylene and hydrogen were cut off, nitrogen was introduced at a flow rate of 450 to 500 sccm, and the temperature was lowered to 300° C. at a cooling rate of 12 to 15° C. / min, and a mixed gas of carbon dioxide and nitrogen was introduced, the flow rate of the mixed gas was 200 sccm, wherein the mixed volume ratio of carbon dioxide to nitrogen was 0.05:1, and the heat treatment was continued for 20 minutes. After cooling to 100° C., the prefabricated microspheres were taken out to prepare silica microspheres.

[0008] The present invention is further configured as follows: the ferrocene compound liquid is compounded by ultrasonically treating ferrocene and anhydrous ethanol at a dosage ratio of 0.05 to 0.1 g / mL for 20 to 30 minutes.

[0009] The present invention is further configured as follows: the preparation process of the graphene aerogel microspheres is as follows: Graphene oxide powder is placed in deionized water at a ratio of 0.05 to 0.1 g / mL and ultrasonically treated for 20 to 30 minutes to obtain a first solution; 4-formylphenylboronic acid is placed in anhydrous ethanol at a ratio of 0.03 to 0.05 g / mL and ultrasonically treated for 20 to 30 minutes to obtain a second solution; Adding 0.05-0.07% sodium chloride by weight of the graphene oxide powder to the first solution, then adding 280-300% toluene by volume of the first solution, mixing by magnetic stirring, then adding 20-22% of the second solution by volume of the first solution, treating at 20-22° C. and 300-350 r / min for 30-40 minutes, then adding a polyethyleneimine aqueous solution, heating to 60-65° C., continuing the treatment for 12-14 hours, cooling to room temperature, centrifuging, discarding the supernatant, and drying to obtain prefabricated aerogel microspheres; The prefabricated aerogel microspheres are placed in a polydopamine solution at a dosage ratio of 0.01 to 0.03 g / mL, shaken for 20 to 30 minutes at 22 to 25° C., centrifuged, and freeze-dried to prepare graphene aerogel microspheres.

[0010] The present invention is further configured as follows: the preparation process of the polyethyleneimine aqueous solution is: polyethyleneimine is placed in deionized water at a mass ratio of 1:96-100 and subjected to magnetic stirring for 20-30 minutes, and then the pH is adjusted to 9-9.2 with hydrochloric acid to prepare the polyethyleneimine aqueous solution; the addition amount of the polyethyleneimine aqueous solution is 38-42% of the first solution.

[0011] The present invention is further configured as follows: the polydopamine solution is prepared by compounding dopamine hydrochloride and PBS buffer in a dosage ratio of 0.05 to 0.08 g / mL.

[0012] The present invention is further configured as follows: the sodium dodecyl sulfate aqueous solution is prepared by mixing sodium dodecyl sulfate and deionized water in a mass ratio of 1:90-100, and the added mass of the barium titanate nanoparticles is 25-30% of the sodium dodecyl sulfate aqueous solution.

[0013] The present invention is further configured as follows: the added mass of the 1,6-hexanediol diacrylate is 5 to 7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene, and the added mass of the 2-cyano-2-propyldodecyl trithiocarbonate is 0.5 to 0.7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene.

[0014] The present invention is further configured as follows: the mass fraction of the azobisisobutylamidine hydrochloride aqueous solution is 1.2-1.5%, and the added mass of the azobisisobutylamidine hydrochloride aqueous solution is 0.05-0.07% of the first preformulation; The temperature of the heating and stirring is 70-75°C, the speed of stirring is 120-150r / min, and the time is 20-30min; The heat preservation and aging time is 2 to 3 hours; The added mass of the 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is 0.08-0.1% of the first preformulation; The UV curing light intensity is 100mW / cm² and the time is 10 to 15 minutes.

[0015] The second aspect of the present invention is to provide a method for preparing the high-damping EVA / EPDM composite foam material, comprising the following steps: Step 1, accurately weighing ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate, and preheating the ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber at 80-86° C. for 100-120 minutes, placing the preheated ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber in a twin-screw extruder for mixing for 10-12 minutes, then adding the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continuing to mix for 8-10 minutes, and finally adding azodicarbonamide and dicumyl peroxide and continuing to mix for 3-5 minutes; Step 2: Extruding the mixed material through the die head of a twin-screw extruder and pelletizing it by water-cooled strand cutting; Step 3: Place the prepared pellets into a preheated mold, set the mold temperature to 160-170°C and the pressure to 15 MPa, pre-press for 4-5 minutes, then place the mold in a flat vulcanizer, and foam and cross-link at 160-170°C for 13-15 minutes. Take out the mold and quickly place it in a cold press to cool to 30-40°C to prepare a high-damping EVA / EPDM composite foam material.

[0016] The present invention is further configured as follows: the processing temperatures of the twin-screw extruder are sequentially set to 120° C., 130° C., 140° C., 150° C., and 160° C. from the feeding section to the die head.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses ethylene-vinyl acetate copolymer, ethylene propylene diene monomer (EPDM), azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate as raw materials, preheats the ethylene-vinyl acetate copolymer and EPDM, places the preheated ethylene-vinyl acetate copolymer and EPDM in a twin-screw extruder for mixing, then adds the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continues to mix, finally adds azodicarbonamide and dicumyl peroxide and continues to mix, extrudes the mixed material through the die head of the twin-screw extruder, and granulates it by water-cooled strand cutting, and places the obtained pellets into a preheated mold, places the mold into a flat vulcanizer for treatment, then takes out the mold and quickly places it into a cold press for cooling, thereby preparing high-damping EVA / EPDM. Composite foam material. The prepared high-damping EVA / EPDM composite foam material not only has good high damping and low rebound properties, but also has excellent tensile strength, effectively ensuring its quality. This shows that the high-damping EVA / EPDM composite foam material and its preparation method provided by the present invention have broader market prospects and are more suitable for promotion. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] Example 1: This embodiment provides a high-damping EVA / EPDM composite foam material, which is composed of the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene propylene diene monomer rubber, 3 parts of azodicarbonamide, 1 part of diisopropylbenzene peroxide, 10 parts of compound filler, 6 parts of maleic anhydride grafted ethylene-octene copolymer, 2 parts of terminal hydroxyl polybutadiene and 1 part of triallyl isocyanurate.

[0020] In this embodiment, ethylene-vinyl acetate copolymer (EVA) was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., ethylene propylene diene monomer (EPDM) was purchased from Shanghai Oushuo Plastic Co., Ltd., maleic anhydride grafted ethylene-octene copolymer (grafting rate 0.8 wt %) was purchased from Shenyang Ketong Plastic Co., Ltd., and hydroxy-terminated polybutadiene was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0021] Among them, the compound filler is made of silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.5:1.5.

[0022] Furthermore, the preparation process of silica microspheres is as follows: The porous silica microspheres were placed in a 2.5 mol / L sodium hydroxide solution at a dosage of 0.05 g / mL, treated at 75°C for 60 min, washed until neutral, and dried. They were then immersed in a 0.1% (mass fraction) polydiallyldimethylammonium chloride aqueous solution and shaken at 40°C for 20 min. After filtration and drying, the mixture was immersed in a ferrocene compound solution for 30 min, and then dried under vacuum at 60 °C to constant weight to obtain prefabricated microspheres; The prefabricated microspheres were placed in a heating box, hydrogen and nitrogen were introduced, the air was exhausted, the temperature was raised to 450°C, and the treatment was carried out for 30 minutes, wherein the flow rate of hydrogen and nitrogen was 200 sccm, then the hydrogen and nitrogen were cut off, acetylene and hydrogen were introduced into the heating box at a flow ratio of 1:3, wherein the flow rate of acetylene was 50 sccm, and the temperature was raised to 680°C and treated for 5 minutes, acetylene and hydrogen were cut off, nitrogen was introduced at a flow rate of 450 sccm, and the temperature was lowered to 300°C at a cooling rate of 12°C / min, and a mixed gas of carbon dioxide and nitrogen was introduced, the flow rate of the mixed gas was 200 sccm, wherein the mixed volume ratio of carbon dioxide and nitrogen was 0.05:1, and the heat treatment was continued for 20 minutes. After the temperature was lowered to within 100°C, the prefabricated microspheres were taken out to prepare silica microspheres.

[0023] The ferrocene compound solution is prepared by ultrasonically treating ferrocene and anhydrous ethanol at a dosage ratio of 0.05 g / mL for 20 minutes.

[0024] In this embodiment, it should be noted that the porous silica microspheres were purchased from Xi'an Ruixi Biotechnology Co., Ltd.

[0025] In addition, the preparation process of graphene aerogel microspheres is as follows: Graphene oxide powder was placed in deionized water at a dosage of 0.05 g / mL and ultrasonically treated for 20 minutes to obtain a first solution; 4-formylphenylboronic acid was placed in anhydrous ethanol at a dosage of 0.03 g / mL and ultrasonically treated for 20 to 30 minutes to obtain a second solution; Sodium chloride (0.05% by weight of the graphene oxide powder) was added to the first solution, and then toluene (280% by volume of the first solution) was added, and the mixture was mixed by magnetic stirring. Then, a second solution (20% by volume of the first solution) was added, and the mixture was treated at 20°C and 300 rpm for 30 minutes. Then, a polyethyleneimine aqueous solution was added, and the mixture was heated to 60°C and treated for 12 hours. The mixture was cooled to room temperature, centrifuged, and the supernatant was discarded. After drying, prefabricated aerogel microspheres were obtained. The prefabricated aerogel microspheres were placed in a polydopamine solution at a dosage ratio of 0.01 g / mL, shaken at 22° C. for 20 minutes, centrifuged, and freeze-dried to prepare graphene aerogel microspheres.

[0026] The preparation process of the polyethyleneimine aqueous solution is as follows: polyethyleneimine is placed in deionized water at a mass ratio of 1:96 and subjected to magnetic stirring for 20 minutes, and then the pH is adjusted to 9 with hydrochloric acid to prepare the polyethyleneimine aqueous solution; the amount of polyethyleneimine aqueous solution added is 38% of the first solution.

[0027] The polydopamine solution is prepared by mixing dopamine hydrochloride and PBS buffer at a dosage ratio of 0.05 g / mL.

[0028] The sodium dodecyl sulfate aqueous solution is prepared by mixing sodium dodecyl sulfate and deionized water in a mass ratio of 1:90, and the added mass of the barium titanate nanoparticles is 25% of the sodium dodecyl sulfate aqueous solution.

[0029] In addition, the preparation process of modified barium titanate nanoparticles is as follows: placing barium titanate nanoparticles in a sodium dodecyl sulfate aqueous solution under high shear to obtain a first preformulation; After 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene was melted, 1,6-hexanediol diacrylate was added thereto in a constant temperature water bath at 60°C, and then 2-cyano-2-propyldodecyl trithiocarbonate was added and mixed uniformly to obtain a second preformulation; The first preformulation and the second preformulation are mixed homogeneously in a volume ratio of 1:3.2, and then an aqueous solution of azobisisobutylamidine hydrochloride is added. The mixture is heated and stirred, and after heat preservation and aging, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is added. Then, the mixture is ultraviolet-cured, centrifuged and washed, and freeze-dried to obtain modified barium titanate nanoparticles.

[0030] Among them, the added mass of 1,6-hexanediol diacrylate is 5-7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene, and the added mass of 2-cyano-2-propyldodecyl trithiocarbonate is 0.5% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene.

[0031] The mass fraction of the aqueous solution of azobisisobutylamidine hydrochloride is 1.2%, and the added mass of the aqueous solution of azobisisobutylamidine hydrochloride is 0.05% of the first pre-formulation; The stirring temperature was 70°C, the stirring speed was 120 r / min, and the stirring time was 20 min. The heat preservation and aging time is 2 to 3 hours; The added mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is 0.08% of the first preformulation; The light intensity of UV curing is 100mW / cm² and the time is 10 to 15 minutes.

[0032] In addition, this embodiment also provides a method for preparing the above-mentioned high-damping EVA / EPDM composite foam material, comprising the following steps: Step 1, accurately weighing ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate, and preheating the ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber at 80° C. for 100 minutes, placing the preheated ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber in a twin-screw extruder for mixing for 10 minutes, then adding the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continuing to mix for 8 minutes, and finally adding azodicarbonamide and dicumyl peroxide and continuing to mix for 3 minutes; Step 2: Extruding the mixed material through the die head of a twin-screw extruder and pelletizing it by water-cooled strand cutting; Step 3: Place the prepared pellets into a preheated mold, set the mold temperature to 160°C and the pressure to 15 MPa, pre-press for 4 minutes, then place the mold in a flat vulcanizer, foam and cross-link at 160°C for 13 minutes, take out the mold, and quickly place it in a cold press to cool to 30°C to prepare a high-damping EVA / EPDM composite foam material.

[0033] Among them, the processing temperature of the twin-screw extruder is set to 120℃, 130℃, 140℃, 150℃, and 160℃ from the feeding section to the die head.

[0034] Example 2: The preparation method of the high-damping EVA / EPDM composite foam material provided in this example is basically the same as that in Example 1, except that the specific raw material composition and the specific preparation method of the compound filler of the high-damping EVA / EPDM composite foam material in this example are different; the specific raw material composition and the specific preparation method of the compound filler of the high-damping EVA / EPDM composite foam material in this example are as follows: A high-damping EVA / EPDM composite foam material is composed of the following raw materials in parts by weight: 65 parts of ethylene-vinyl acetate copolymer, 35 parts of ethylene propylene diene monomer rubber, 4 parts of azodicarbonamide, 2 parts of dicumyl peroxide, 11 parts of composite filler, 8 parts of maleic anhydride grafted ethylene-octene copolymer, 3 parts of hydroxyl-terminated polybutadiene and 2 parts of triallyl isocyanurate.

[0035] In this embodiment, ethylene-vinyl acetate copolymer (EVA) was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., ethylene propylene diene monomer (EPDM) was purchased from Shanghai Oushuo Plastic Co., Ltd., maleic anhydride grafted ethylene-octene copolymer (grafting rate 0.8 wt %) was purchased from Shenyang Ketong Plastic Co., Ltd., and hydroxy-terminated polybutadiene was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0036] Among them, the compound filler is made of silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.6:1.6.

[0037] Furthermore, the preparation process of silica microspheres is as follows: The porous silica microspheres were placed in a 2.7 mol / L sodium hydroxide solution at a dosage of 0.1 g / mL and treated at 77°C for 65 min. The microspheres were washed until neutral and dried. They were then immersed in a 0.1% polydiallyldimethylammonium chloride aqueous solution and shaken at 40°C for 25 min. After filtration and drying, the mixture was immersed in a ferrocene compound solution for 35 min, and then dried under vacuum at 65 °C to constant weight to obtain prefabricated microspheres; The prefabricated microspheres were placed in a heating box, hydrogen and nitrogen were introduced, the air was exhausted, the temperature was raised to 450°C, and the treatment was carried out for 32 minutes, wherein the flow rate of hydrogen and nitrogen was 200 sccm, then the hydrogen and nitrogen were cut off, acetylene and hydrogen were introduced into the heating box at a flow ratio of 1:4, wherein the flow rate of acetylene was 70 sccm, and the temperature was raised to 680°C and treated for 7 minutes, acetylene and hydrogen were cut off, nitrogen was introduced at a flow rate of 475 sccm, and the temperature was lowered to 300°C at a cooling rate of 13°C / min, and a mixed gas of carbon dioxide and nitrogen was introduced, the flow rate of the mixed gas was 200 sccm, wherein the mixed volume ratio of carbon dioxide and nitrogen was 0.05:1, and the heat treatment was continued for 20 minutes. After the temperature was lowered to within 100°C, the prefabricated microspheres were taken out to prepare silica microspheres.

[0038] The ferrocene compound solution is prepared by ultrasonically treating ferrocene and anhydrous ethanol at a dosage ratio of 0.07 g / mL for 25 minutes.

[0039] In this embodiment, it should be noted that the porous silica microspheres were purchased from Xi'an Ruixi Biotechnology Co., Ltd.

[0040] In addition, the preparation process of graphene aerogel microspheres is as follows: Graphene oxide powder was placed in deionized water at a ratio of 0.07 g / mL and ultrasonically treated for 25 minutes to obtain a first solution; 4-formylphenylboronic acid was placed in anhydrous ethanol at a ratio of 0.04 g / mL and ultrasonically treated for 25 minutes to obtain a second solution; Sodium chloride (0.06% by weight of the graphene oxide powder) was added to the first solution, and then toluene (290% by volume of the first solution) was added, and the mixture was mixed by magnetic stirring. Then, a second solution (21% by volume of the first solution) was added, and the mixture was treated at 21°C and 325 rpm for 35 minutes. Then, a polyethyleneimine aqueous solution was added, and the mixture was heated to 62°C and treated for 13 hours. The mixture was cooled to room temperature, centrifuged, and the supernatant was discarded. After drying, prefabricated aerogel microspheres were obtained. The prefabricated aerogel microspheres were placed in a polydopamine solution at a dosage ratio of 0.02 g / mL, shaken at 22° C. for 25 min, centrifuged, and freeze-dried to prepare graphene aerogel microspheres.

[0041] The preparation process of the polyethyleneimine aqueous solution is as follows: polyethyleneimine is placed in deionized water at a mass ratio of 1:98 and subjected to magnetic stirring for 25 minutes, and then the pH is adjusted to 9.1 with hydrochloric acid to prepare the polyethyleneimine aqueous solution; the amount of polyethyleneimine aqueous solution added is 40% of the first solution.

[0042] The polydopamine solution is prepared by mixing dopamine hydrochloride and PBS buffer at a dosage ratio of 0.06 g / mL.

[0043] The sodium dodecyl sulfate aqueous solution is prepared by mixing sodium dodecyl sulfate and deionized water in a mass ratio of 1:950, and the added mass of the barium titanate nanoparticles is 27% of the sodium dodecyl sulfate aqueous solution.

[0044] In addition, the preparation process of modified barium titanate nanoparticles is as follows: placing barium titanate nanoparticles in a sodium dodecyl sulfate aqueous solution under high shear to obtain a first preformulation; After 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene was melted, 1,6-hexanediol diacrylate was added thereto in a constant temperature water bath at 60°C, and then 2-cyano-2-propyldodecyl trithiocarbonate was added and mixed uniformly to obtain a second preformulation; The first preformulation and the second preformulation are mixed homogeneously in a volume ratio of 1:3.3, and then an aqueous solution of azobisisobutylamidine hydrochloride is added. The mixture is heated and stirred, and after heat preservation and aging, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is added. Then, the mixture is ultraviolet-cured, centrifuged and washed, and freeze-dried to obtain modified barium titanate nanoparticles.

[0045] Among them, the added mass of 1,6-hexanediol diacrylate is 5-7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene, and the added mass of 2-cyano-2-propyldodecyl trithiocarbonate is 0.6% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene.

[0046] The mass fraction of the aqueous solution of azobisisobutylamidine hydrochloride is 1.3%, and the added mass of the aqueous solution of azobisisobutylamidine hydrochloride is 0.06% of the first pre-formulation; The stirring temperature was 72°C, the stirring speed was 135 r / min, and the stirring time was 25 min. The heat preservation and aging time is 3h; The added mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is 0.09% of the first preformulation; The UV curing light intensity is 100mW / cm² and the curing time is 12min.

[0047] In addition, this embodiment also provides a method for preparing the above-mentioned high-damping EVA / EPDM composite foam material, comprising the following steps: Step 1, accurately weighing ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate, and preheating the ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber at 83° C. for 110 minutes, placing the preheated ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber in a twin-screw extruder for mixing for 11 minutes, then adding the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continuing to mix for 9 minutes, and finally adding azodicarbonamide and dicumyl peroxide and continuing to mix for 4 minutes; Step 2: Extruding the mixed material through the die head of a twin-screw extruder and pelletizing it by water-cooled strand cutting; Step 3: Place the prepared pellets into a preheated mold, set the mold temperature to 165°C and the pressure to 15 MPa, pre-press for 5 minutes, then place the mold in a flat vulcanizer, foam and cross-link at 165°C for 14 minutes, take out the mold, and quickly place it in a cold press to cool to 35°C to prepare a high-damping EVA / EPDM composite foam material.

[0048] Among them, the processing temperature of the twin-screw extruder is set to 120℃, 130℃, 140℃, 150℃, and 160℃ from the feeding section to the die head.

[0049] Example 3: The preparation method of the high-damping EVA / EPDM composite foam material provided in this example is basically the same as that in Example 1, except that the specific raw material composition and the specific preparation method of the compound filler of the high-damping EVA / EPDM composite foam material in this example are different; the specific raw material composition and the specific preparation method of the compound filler of the high-damping EVA / EPDM composite foam material in this example are as follows: A high-damping EVA / EPDM composite foam material is composed of the following raw materials in parts by weight: 80 parts of ethylene-vinyl acetate copolymer, 50 parts of ethylene propylene diene monomer rubber, 5 parts of azodicarbonamide, 3 parts of dicumyl peroxide, 12 parts of composite filler, 10 parts of maleic anhydride grafted ethylene-octene copolymer, 4 parts of hydroxyl-terminated polybutadiene and 4 parts of triallyl isocyanurate.

[0050] In this embodiment, ethylene-vinyl acetate copolymer (EVA) was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., ethylene propylene diene monomer (EPDM) was purchased from Shanghai Oushuo Plastic Co., Ltd., maleic anhydride grafted ethylene-octene copolymer (grafting rate 0.8 wt %) was purchased from Shenyang Ketong Plastic Co., Ltd., and hydroxy-terminated polybutadiene was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0051] Among them, the compound filler is made of silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.7:1.8.

[0052] Furthermore, the preparation process of silica microspheres is as follows: The porous silica microspheres were placed in a 3 mol / L sodium hydroxide solution at a dosage of 0.2 g / mL and treated at 80°C for 70 min. The microspheres were washed until neutral and dried. The microspheres were then immersed in a 0.1% polydiallyldimethylammonium chloride aqueous solution and shaken at 40°C for 30 min. After filtration and drying, the mixture was immersed in a ferrocene compound solution for 40 min and then dried under vacuum at 70 °C to constant weight to obtain prefabricated microspheres; The prefabricated microspheres were placed in a heating box, hydrogen and nitrogen were introduced, the air was exhausted, the temperature was raised to 450°C, and the treatment was carried out for 35 minutes, wherein the flow rate of hydrogen and nitrogen was 200 sccm, then the hydrogen and nitrogen were cut off, acetylene and hydrogen were introduced into the heating box at a flow ratio of 1:4, wherein the flow rate of acetylene was 100 sccm, and the temperature was raised to 680°C and treated for 10 minutes, acetylene and hydrogen were cut off, nitrogen was introduced at a flow rate of 500 sccm, and the temperature was lowered to 300°C at a cooling rate of 15°C / min, and a mixed gas of carbon dioxide and nitrogen was introduced, the flow rate of the mixed gas was 200 sccm, wherein the mixed volume ratio of carbon dioxide and nitrogen was 0.05:1, and the heat treatment was continued for 20 minutes. After the temperature was lowered to within 100°C, the prefabricated microspheres were taken out to prepare silica microspheres.

[0053] The ferrocene compound solution is prepared by ultrasonically treating ferrocene and anhydrous ethanol at a dosage ratio of 0.1 g / mL for 30 minutes.

[0054] In this embodiment, it should be noted that the porous silica microspheres were purchased from Xi'an Ruixi Biotechnology Co., Ltd.

[0055] In addition, the preparation process of graphene aerogel microspheres is as follows: Graphene oxide powder was placed in deionized water at a dosage ratio of 0.1 g / mL and ultrasonically treated for 30 minutes to obtain a first solution; 4-formylphenylboronic acid was placed in anhydrous ethanol at a dosage ratio of 0.05 g / mL and ultrasonically treated for 30 minutes to obtain a second solution; Sodium chloride (0.07% by weight of the graphene oxide powder) was added to the first solution, and then toluene (300% by volume of the first solution) was added, and the mixture was mixed by magnetic stirring. Then, a second solution (22% by volume of the first solution) was added, and the mixture was treated at 22°C and 350 r / min for 40 minutes. Then, a polyethyleneimine aqueous solution was added, and the mixture was heated to 65°C and treated for 14 hours. The mixture was cooled to room temperature, centrifuged, and the supernatant was discarded. After drying, prefabricated aerogel microspheres were obtained. The prefabricated aerogel microspheres were placed in a polydopamine solution at a dosage ratio of 0.03 g / mL, shaken at 25° C. for 30 minutes, centrifuged, and freeze-dried to prepare graphene aerogel microspheres.

[0056] The preparation process of the polyethyleneimine aqueous solution is as follows: polyethyleneimine is placed in deionized water at a mass ratio of 1:100 and subjected to magnetic stirring for 30 minutes, and then the pH is adjusted to 9.2 with hydrochloric acid to prepare the polyethyleneimine aqueous solution; the amount of the polyethyleneimine aqueous solution added is 42% of the first solution.

[0057] The polydopamine solution is prepared by compounding dopamine hydrochloride and PBS buffer at a dosage ratio of 0.08 g / mL.

[0058] The sodium dodecyl sulfate aqueous solution is prepared by mixing sodium dodecyl sulfate and deionized water in a mass ratio of 1:100, and the added mass of the barium titanate nanoparticles is 30% of the sodium dodecyl sulfate aqueous solution.

[0059] In addition, the preparation process of modified barium titanate nanoparticles is as follows: placing barium titanate nanoparticles in a sodium dodecyl sulfate aqueous solution under high shear to obtain a first preformulation; After 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene was melted, 1,6-hexanediol diacrylate was added thereto in a constant temperature water bath at 60°C, and then 2-cyano-2-propyldodecyl trithiocarbonate was added and mixed uniformly to obtain a second preformulation; The first preformulation and the second preformulation are mixed homogeneously in a volume ratio of 1:3.5, and then an aqueous solution of azobisisobutylamidine hydrochloride is added. The mixture is heated and stirred, and after heat preservation and aging, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is added. Then, the mixture is ultraviolet-cured, centrifuged and washed, and freeze-dried to obtain modified barium titanate nanoparticles.

[0060] Among them, the added mass of 1,6-hexanediol diacrylate is 7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene, and the added mass of 2-cyano-2-propyldodecyl trithiocarbonate is 0.7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene.

[0061] The mass fraction of the aqueous solution of azobisisobutylamidine hydrochloride is 1.5%, and the added mass of the aqueous solution of azobisisobutylamidine hydrochloride is 0.07% of the first pre-formulation; The stirring temperature was 75°C, the stirring speed was 150 r / min, and the stirring time was 30 min. The heat preservation and aging time is 3h; The added mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is 0.1% of the first preformulation; The UV curing light intensity is 100mW / cm² and the curing time is 15min.

[0062] In addition, this embodiment also provides a method for preparing the above-mentioned high-damping EVA / EPDM composite foam material, comprising the following steps: Step 1, accurately weighing ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate, and preheating the ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber at 86° C. for 120 min, placing the preheated ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber in a twin-screw extruder for mixing for 12 min, then adding the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continuing to mix for 10 min, and finally adding azodicarbonamide and dicumyl peroxide and continuing to mix for 5 min; Step 2: Extruding the mixed material through the die head of a twin-screw extruder and pelletizing it by water-cooled strand cutting; Step 3: Place the prepared pellets into a preheated mold, set the mold temperature to 170°C and the pressure to 15 MPa, pre-press for 5 minutes, then place the mold in a flat vulcanizer, foam and cross-link at 170°C for 15 minutes, take out the mold, and quickly place it in a cold press to cool to 40°C to prepare a high-damping EVA / EPDM composite foam material.

[0063] Among them, the processing temperature of the twin-screw extruder is set to 120℃, 130℃, 140℃, 150℃, and 160℃ from the feeding section to the die head.

[0064] Comparative Example 1: The difference from Example 1 is that this example does not contain a composite filler.

[0065] Comparative Example 2: The difference from Example 1 is that an equal amount of silica microspheres is used instead of the compound filler in this example.

[0066] Comparative Example 3: The difference from Example 1 is that in this example, an equal amount of graphene aerogel microspheres is used instead of the compound filler.

[0067] Comparative Example 4: The difference from Example 1 is that in this example, an equal amount of modified barium titanate nanoparticles is used instead of the compound filler.

[0068] Comparative Example 5: The difference from Example 1 is that this example does not contain terminal hydroxyl polybutadiene.

[0069] Comparative Example 6: The difference from Example 1 is that the composite filler in this example is composed of silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.4:1.4.

[0070] Comparative Example 7: The difference from Example 1 is that the composite filler in this example is composed of silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.8:1.9.

[0071] Performance test: The high-damping EVA / EPDM composite foam material samples provided in Examples 1 to 3 and Comparative Examples 1 to 7 were marked as Examples 1 to 3 and Comparative Examples 1 to 7, respectively; and the relevant properties of the high-damping EVA / EPDM composite foam materials provided in Examples 1 to 3 and Comparative Examples 1 to 7 were tested as follows: 1. Tensile strength test: The test method is based on the standard of GB / T528-2009.

[0072] 2. Permanent compression deflection test: The test method is based on the standard of HG / T2876-2009.

[0073] 3. Rebound rate test: The test method is to use GT-7042-RE impact elasticity testing machine.

[0074] 4. Maximum loss factor test: The test method is to use RSAG2 solid analyzer.

[0075] The obtained test data are recorded in Tables 1 to 4 below.

[0076]

[0077]

[0078]

[0079]

[0080] Comparison and analysis of the relevant data in Tables 1 to 4 demonstrate that the high-damping EVA / EPDM composite foam material prepared by the present invention not only exhibits excellent high damping and low rebound properties, but also possesses excellent tensile strength, effectively guaranteeing its quality. This demonstrates that the high-damping EVA / EPDM composite foam material and its preparation method provided by the present invention have broader market prospects and are more suitable for promotion.

[0081] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0082] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high damping EVA / EPDM composite foam material, characterized in that: The invention is composed of the following raw materials in parts by weight: 50 to 80 parts of ethylene-vinyl acetate copolymer, 20 to 50 parts of ethylene propylene diene monomer rubber, 3 to 5 parts of azodicarbonamide, 1 to 3 parts of dicumyl peroxide, 10 to 12 parts of compound filler, 6 to 10 parts of maleic anhydride grafted ethylene-octene copolymer, 2 to 4 parts of hydroxyl-terminated polybutadiene and 1 to 4 parts of triallyl isocyanurate; The composite filler is prepared by compounding silica microspheres, graphene aerogel microspheres and modified barium titanate nanoparticles in a mass ratio of 1:1.5-1.7:1.5-1.8; The preparation process of the modified barium titanate nanoparticles is as follows: placing barium titanate nanoparticles in a sodium dodecyl sulfate aqueous solution under high shear to obtain a first preformulation; After 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene was melted, 1,6-hexanediol diacrylate was added thereto in a constant temperature water bath at 60°C, and then 2-cyano-2-propyldodecyl trithiocarbonate was added and mixed uniformly to obtain a second preformulation; The first preformulation and the second preformulation are mixed homogeneously in a volume ratio of 1:3.2-3.5, and then an aqueous solution of azobisisobutylamidine hydrochloride is added. The mixture is heated and stirred, and after heat preservation and aging, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is added. Then, the mixture is ultraviolet-cured, centrifuged and washed, and freeze-dried to obtain modified barium titanate nanoparticles.

2. The high damping EVA / EPDM composite foam material according to claim 1, characterized in that: The preparation process of the silica microspheres is as follows: The porous silica microspheres were placed in a sodium hydroxide solution with a volume concentration of 2.5 to 3 mol / L at a dosage of 0.05 to 0.2 g / mL, treated at 75 to 80°C for 60 to 70 minutes, washed until neutral, and dried. The microspheres were then immersed in a 0.1% polydiallyldimethylammonium chloride aqueous solution and shaken at 40°C for 20 to 30 minutes. After filtration and drying, the mixture was immersed in a ferrocene compound solution for 30 to 40 minutes, and then dried under vacuum conditions at 60 to 70°C to a constant weight to obtain prefabricated microspheres; The prefabricated microspheres were placed in a heating box, hydrogen and nitrogen were introduced, air was exhausted, the temperature was raised to 450° C., and the treatment was carried out for 30 to 35 minutes, wherein the flow rate of hydrogen and nitrogen was 200 sccm, then the hydrogen and nitrogen were cut off, acetylene and hydrogen were introduced into the heating box at a flow ratio of 1:3 to 4, wherein the flow rate of acetylene was 50 to 100 sccm, and the temperature was raised to 680° C. and treated for 5 to 10 minutes, acetylene and hydrogen were cut off, nitrogen was introduced at a flow rate of 450 to 500 sccm, and the temperature was lowered to 300° C. at a cooling rate of 12 to 15° C. / min, and a mixed gas of carbon dioxide and nitrogen was introduced, the flow rate of the mixed gas was 200 sccm, wherein the mixed volume ratio of carbon dioxide to nitrogen was 0.05:1, and the heat treatment was continued for 20 minutes. After cooling to 100° C., the prefabricated microspheres were taken out to prepare silica microspheres.

3. The high damping EVA / EPDM composite foam material according to claim 2, characterized in that: The ferrocene compound liquid is prepared by ultrasonically treating ferrocene and anhydrous ethanol at a dosage ratio of 0.05 to 0.1 g / mL for 20 to 30 minutes.

4. The high damping EVA / EPDM composite foam material according to claim 1, characterized in that: The preparation process of the graphene aerogel microspheres is as follows: Graphene oxide powder is placed in deionized water at a ratio of 0.05 to 0.1 g / mL and ultrasonically treated for 20 to 30 minutes to obtain a first solution; 4-formylphenylboronic acid is placed in anhydrous ethanol at a ratio of 0.03 to 0.05 g / mL and ultrasonically treated for 20 to 30 minutes to obtain a second solution; Adding 0.05-0.07% sodium chloride by weight of the graphene oxide powder to the first solution, then adding 280-300% toluene by volume of the first solution, mixing by magnetic stirring, then adding 20-22% of the second solution by volume of the first solution, treating at 20-22° C. and 300-350 r / min for 30-40 minutes, then adding a polyethyleneimine aqueous solution, heating to 60-65° C., continuing the treatment for 12-14 hours, cooling to room temperature, centrifuging, discarding the supernatant, and drying to obtain prefabricated aerogel microspheres; The prefabricated aerogel microspheres are placed in a polydopamine solution at a dosage ratio of 0.01 to 0.03 g / mL, shaken for 20 to 30 minutes at 22 to 25° C., centrifuged, and freeze-dried to prepare graphene aerogel microspheres.

5. The high damping EVA / EPDM composite foam material according to claim 4, characterized in that: The preparation process of the polyethyleneimine aqueous solution is as follows: polyethyleneimine is placed in deionized water at a mass ratio of 1:96-100 and subjected to magnetic stirring for 20-30 minutes, and then the pH is adjusted to 9-9.2 with hydrochloric acid to prepare the polyethyleneimine aqueous solution; the amount of the polyethyleneimine aqueous solution added is 38-42% of the first solution.

6. The high damping EVA / EPDM composite foam material according to claim 4, characterized in that: The polydopamine solution is prepared by compounding dopamine hydrochloride and PBS buffer solution in a dosage ratio of 0.05 to 0.08 g / mL.

7. The high damping EVA / EPDM composite foam material according to claim 1, characterized in that: The sodium dodecyl sulfate aqueous solution is prepared by mixing sodium dodecyl sulfate and deionized water in a mass ratio of 1:90-100, and the added mass of the barium titanate nanoparticles is 25-30% of the sodium dodecyl sulfate aqueous solution.

8. The high damping EVA / EPDM composite foam material according to claim 1, characterized in that: The added mass of the 1,6-hexanediol diacrylate is 5-7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene, and the added mass of the 2-cyano-2-propyldodecyl trithiocarbonate is 0.5-0.7% of 1,4-bis[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methylbenzene.

9. The high damping EVA / EPDM composite foam material according to claim 1, characterized in that: The mass fraction of the azobisisobutylamidine hydrochloride aqueous solution is 1.2-1.5%, and the added mass of the azobisisobutylamidine hydrochloride aqueous solution is 0.05-0.07% of the first preformulation; The temperature of the heating and stirring is 70-75°C, the speed of stirring is 120-150r / min, and the time is 20-30min; The heat preservation and aging time is 2 to 3 hours; The added mass of the 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is 0.08-0.1% of the first preformulation; The UV curing light intensity is 100mW / cm² and the time is 10 to 15 minutes.

10. The method for preparing the high-damping EVA / EPDM composite foam material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, accurately weighing ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, azodicarbonamide, dicumyl peroxide, compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate, and preheating the ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber at 80-86° C. for 100-120 minutes, placing the preheated ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber in a twin-screw extruder for mixing for 10-12 minutes, then adding the compound filler, maleic anhydride grafted ethylene-octene copolymer, hydroxyl-terminated polybutadiene and triallyl isocyanurate and continuing to mix for 8-10 minutes, and finally adding azodicarbonamide and dicumyl peroxide and continuing to mix for 3-5 minutes; Step 2: Extruding the mixed material through the die head of a twin-screw extruder and pelletizing it by water-cooled strand pelletizing; Step 3: Place the prepared pellets into a preheated mold, set the mold temperature to 160-170°C and the pressure to 15 MPa, pre-press for 4-5 minutes, then place the mold in a flat vulcanizer, foam and cross-link at 160-170°C for 13-15 minutes, take out the mold, and quickly place it in a cold press to cool to 30-40°C to prepare a high-damping EVA / EPDM composite foam material.

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