Ethylene propylene diene monomer material and manufacturing method thereof

Abstract

The invention discloses an ethylene-propylene-diene monomer rubber material and a manufacturing method thereof, and relates to the technical field of high polymer materials, the ethylene-propylene-diene monomer rubber material comprises, by weight, 100 parts of ethylene-propylene-diene monomer rubber, 50-70 parts of a filler, 10-15 parts of modified polypropylene, 0.5-3 parts of a vulcanizing agent and 0.2-2 parts of an auxiliary agent; wherein the modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains the following components in percentage by mass: 10%-13% of a graphene composite body and 87%-90% of a polypropylene composite body; the graphene complex is reduced graphene loaded with zinc oxide nanoparticles, and the polypropylene complex is grafted polypropylene obtained by grafting polypropylene through a grafting monomer. The grafting monomer is at least one of acrylic acid, methacrylic acid and maleic anhydride or is combined with at least one of styrene and acrylamide according to a molar ratio of 1: (0.2-0.8). The plastic track has the advantages that tensile strength, wear resistance and elasticity are improved, and the service life of the plastic track prepared from the plastic track is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of polymer materials, and in particular to an EPDM rubber material and a method for manufacturing the same. Background Art

[0002] EPDM is a terpolymer of ethylene, propylene and a non-conjugated diene. The diene has a special structure in which only one of the two bonds can be copolymerized, and the unsaturated double bond mainly serves as a crosslink. The other unsaturated will not become the main polymer chain, but only a side chain. The main polymer chain of EPDM is fully saturated. This property makes EPDM resistant to heat, light, oxygen and especially ozone. EPDM is essentially non-polar, resistant to polar solutions and chemicals, has low water absorption and has good insulating properties. During the EPDM production process, its properties can be adjusted by changing the number of three monomers, the ethylene-propylene ratio, the molecular weight and its distribution, and the method of vulcanization.

[0003] A Chinese patent with announcement number CN108559184B discloses an environmentally friendly EPDM rubber particle and a preparation method thereof. The environmentally friendly EPDM rubber particle is prepared from the following raw materials in parts by mass: 100 parts of an EPDM rubber composition, 50-80 parts of a filler, 1-3 parts of an activator, 1-3 parts of an environmental accelerator, 1-5 parts of a vulcanizer, 5-10 parts of a reinforcing agent, and 1-3 parts of a pigment. The EPDM rubber composition is a mixture of EPDM rubber, acrylonitrile-modified EPDM rubber, and acrylic acid-modified EPDM rubber, and the mass ratio of the three is (1-3): (1-3): (1-3), preferably 1:2:2. The preparation method of the acrylonitrile modified EPDM rubber comprises the following steps: firstly dissolving the EPDM rubber in a toluene solution, then adding acrylonitrile and an initiator, and generating the acrylonitrile modified EPDM rubber under heating conditions, wherein the mass ratio of acrylonitrile to the EPDM rubber is 3:(3-4). The preparation method of the acrylic acid modified EPDM rubber comprises the following steps: uniformly mixing acrylic acid, EPDM rubber and an initiator, and extruding and granulating through a twin-screw extruder to obtain the acrylic acid modified EPDM rubber, wherein the mass ratio of acrylic acid to the EPDM rubber is 1:(12-18).

[0004] However, in the preparation process of the environmentally friendly EPDM rubber particles, it is necessary to prepare acrylonitrile-modified EPDM rubber and acrylonitrile-modified EPDM rubber, and then mix them with EPDM rubber in proportion, which will result in the EPDM rubber composition as the core main component to be prepared through a complex process in the early stage. In addition, in the preparation process, the EPDM rubber needs to be dissolved in toluene for subsequent preparation and completed in the form of melt grafting, which requires professional equipment and is difficult to obtain an EPDM rubber composition with uniform and stable composition, and it is difficult to ensure the performance stability of the environmentally friendly EPDM rubber particles obtained, which needs to be improved. Summary of the invention

[0005] In view of this, the first object of the present application is to provide an EPDM rubber material to achieve stable performance and effectively control costs. The specific scheme is as follows: An EPDM rubber material comprises 100 parts by weight of EPDM raw rubber, 50-70 parts by weight of filler, 10-15 parts by weight of modified polypropylene, 0.5-3 parts by weight of vulcanizing agent and 0.2-2 parts by weight of auxiliary agent; wherein: The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 10-13% of a graphene complex and 87-90% of a polypropylene complex by mass percentage; the graphene complex is reduced graphene loaded with zinc oxide nanoparticles, and the polypropylene complex is a grafted polypropylene obtained by grafting polypropylene with a grafting monomer, and the grafting monomer is at least one of acrylic acid, methacrylic acid and maleic anhydride, or is combined with at least one of styrene and acrylamide in a molar ratio of 1:0.2-0.8.

[0006] Preferably: the reduced graphene loaded with zinc oxide nanoparticles is obtained by mixing an amination graphene solution with nano zinc oxide, and after ultrasonic treatment for 10 minutes, adding ammonia water to the solution, and controlling the pH to 13, gradually increasing the temperature to 180°C and keeping stirring, adding hydrazine hydrate during the heating process, controlling the addition of hydrazine hydrate to 0.2-0.5 of the amount of ammonia water, and reacting for 10 hours; wherein the molar ratio of amination graphene to nano zinc oxide in the amination graphene solution is 10:0.1-0.13.

[0007] Preferably, the grafted polypropylene is prepared by mixing, melt-extruding and granulating polypropylene, grafted monomer and initiator in a weight ratio of 100:2-10:0.05-0.6, and the temperature is controlled at 190-200° C.; the initiator is dicumyl peroxide, TBP or benzoyl peroxide.

[0008] Preferably, it also includes adding maleic anhydride grafted polypropylene wax in a weight ratio of 100:0.1-1 parts to polypropylene.

[0009] Preferably, the filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%.

[0010] Preferably: the vulcanizing agent is peroxide and / or sulfur.

[0011] Preferably: the auxiliary agent is zinc methacrylate.

[0012] Preferably, the invention further comprises 0.01-3 parts of a pigment, wherein the pigment is an azo pigment, a phthalocyanine pigment or a quinacridone pigment.

[0013] The second object of the present invention is to provide a method for preparing an EPDM rubber material, which is used to prepare the EPDM rubber material as described above, comprising the following steps: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 168-175°C, and mix for 1-2 hours to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3: Vulcanization treatment: Put the mixed blank into a vulcanizer for vulcanization treatment to obtain a finished EPDM rubber material.

[0014] Preferably, the temperature of the vulcanization treatment is controlled at 175-180°C, the vulcanization time is controlled at 15-20min, and the vulcanization pressure is controlled at 4-4.8MPa.

[0015] It can be seen from the above scheme that the present application provides an EPDM rubber material and a method for manufacturing the same, wherein the EPDM rubber material is prepared by mixing EPDM raw rubber, filler, modified polypropylene and additives, thereby improving the compatibility between the EPDM raw rubber and the filler through the modified polypropylene, so as to improve the chemical resistance and heat resistance of the EPDM raw rubber through the modified polypropylene, and make the EPDM rubber material have improved tensile strength, wear resistance and elasticity, thereby effectively extending the service life of the plastic track prepared with it as a plastic track material. DETAILED DESCRIPTION

[0016] The following will be clearly and completely described in conjunction with the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] It should be mentioned that the EPDM raw rubber in the embodiment of the present application is KTER6537 purchased from LVE of South Korea. The grafting rate of the obtained grafted polypropylene was detected by infrared spectrophotometry, and the grafting rate by weight was 3.5-5%. The pigments, vulcanizing agents and additives in the embodiment of the present application are all commercially available and will not be described in detail here. Polypropylene is 5701P (homopolymer PP) purchased from Saudi Arabia Sabic. The peroxide is commercially available diisopropylbenzene peroxide.

[0018] The EPDM rubber material and its manufacturing method of the present application will be described in detail below.

[0019] An EPDM rubber material comprises 100 parts by weight of EPDM raw rubber, 50-70 parts by weight of filler, 10-15 parts by weight of modified polypropylene, 0.5-3 parts by weight of vulcanizing agent and 0.2-2 parts by weight of auxiliary agent. The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 10-13% of the graphene composite and 87-90% of the polypropylene composite by mass percentage. The graphene composite has the function of increasing the strength of the polypropylene composite and further improving its heat resistance, corrosion resistance, strength and elastic modulus.

[0020] In order to solve the compatibility problem between graphene and polypropylene materials, the embodiments of the present application adopt the form of a graphene composite and a polypropylene composite.

[0021] The graphene composite is reduced graphene loaded with zinc oxide nanoparticles. The polypropylene composite is grafted polypropylene grafted with a grafting monomer, and the grafting monomer is at least one of acrylic acid, methacrylic acid and maleic anhydride or a combination of styrene and acrylamide at a molar ratio of 1:0.2-0.8.

[0022] It should be mentioned that the reduction of graphene loaded with zinc oxide nanoparticles is achieved by mixing an amination graphene solution with nano-zinc oxide. After ultrasonic treatment for 10 minutes, ammonia water is added to the solution, and the pH is controlled to be 13. The temperature is gradually increased to 180°C and stirred. Hydrazine hydrate is added during the heating process, and the addition of hydrazine hydrate is controlled to be 0.2-0.5 of the amount of ammonia water added, and the reaction is carried out for 10 hours to obtain the result. The molar ratio of amination graphene to nano-zinc oxide in the amination graphene solution is 10:0.1-0.13.

[0023] The grafted polypropylene is prepared by mixing, melt-extruding and granulating polypropylene, grafted monomer and initiator in a weight ratio of 100:2-10:0.05-0.6, and the temperature is controlled at 190-200° C. The initiator used is dicumyl peroxide, TBP or benzoyl peroxide.

[0024] The filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%. The vulcanizing agent is peroxide and / or sulfur. The auxiliary agent is zinc methacrylate.

[0025] A method for manufacturing an EPDM rubber material, for preparing the EPDM rubber material as described above, comprises the following steps: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 168-175°C, and mix for 1-2 hours to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3, vulcanization treatment: put the mixed blank into a vulcanizer for vulcanization treatment, the vulcanization temperature is controlled to 175-180°C, the vulcanization time is controlled to 15-20min, and the vulcanization pressure is controlled to 4-4.8MPa to obtain a finished EPDM rubber material.

[0026] Embodiment 1 An EPDM rubber material includes 100 parts by weight of EPDM raw rubber, 50 parts of filler, 10 parts of modified polypropylene, 2.5 parts of dicumyl peroxide and 0.2 parts of zinc methacrylate. Wherein: The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 10% of the graphene composite and 90% of the polypropylene composite by mass percentage. The graphene composite has the function of increasing the strength of the polypropylene composite and further improving its heat resistance, corrosion resistance, strength and elastic modulus.

[0027] In order to solve the compatibility problem between graphene and polypropylene materials, the embodiments of the present application adopt the form of a graphene composite and a polypropylene composite.

[0028] The graphene composite is reduced graphene loaded with zinc oxide nanoparticles. The polypropylene composite is grafted polypropylene grafted with a grafting monomer, and the grafting monomer is acrylic acid.

[0029] It should be mentioned that the reduction of graphene loaded with zinc oxide nanoparticles is achieved by mixing an amination graphene solution with nano-zinc oxide. After ultrasonic treatment for 10 minutes, ammonia water is added to the solution, and the pH is controlled to be 13. The temperature is gradually increased to 180°C and stirred. Hydrazine hydrate is added during the heating process, and the addition of hydrazine hydrate is controlled to be 0.2 of the amount of ammonia water added, and the reaction is carried out for 10 hours to obtain the result. The molar ratio of amination graphene to nano-zinc oxide in the amination graphene solution is 10:0.1.

[0030] The grafted polypropylene is prepared by mixing polypropylene, grafted monomer and initiator in a weight ratio of 100:2:0.05, melting, extruding and granulating. The temperature is controlled at 190° C. and the initiator used is dicumyl peroxide.

[0031] The filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is 97.3%.

[0032] A method for manufacturing an EPDM rubber material, for preparing the EPDM rubber material as described above, comprises the following steps: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 168°C, and mix for 2 hours to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3, vulcanization treatment: the mixed blank is put into a vulcanizer for vulcanization treatment, the vulcanization temperature is controlled at 175° C., the vulcanization time is controlled at 20 min, and the vulcanization pressure is controlled at 4 MPa to obtain a finished EPDM rubber material.

[0033] Embodiment 2 An EPDM rubber material includes 100 parts by weight of EPDM raw rubber, 60 parts by weight of filler, 12 parts by weight of modified polypropylene, 0.5 parts by weight of sulfur, and 1 part by weight of zinc methacrylate. The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 12% of the graphene composite and 88% of the polypropylene composite by mass. The graphene composite has the function of increasing the strength of the polypropylene composite and further improving its heat resistance, corrosion resistance, strength and elastic modulus.

[0034] In order to solve the compatibility problem between graphene and polypropylene materials, the embodiments of the present application adopt the form of a graphene composite and a polypropylene composite.

[0035] The graphene composite is reduced graphene loaded with zinc oxide nanoparticles. The polypropylene composite is grafted polypropylene obtained by grafting polypropylene with a grafting monomer, and the grafting monomer is a combination of methacrylic acid and styrene in a molar ratio of 1:0.5.

[0036] It should be mentioned that the reduction of graphene loaded with zinc oxide nanoparticles is achieved by mixing an amination graphene solution with nano-zinc oxide. After ultrasonic treatment for 10 minutes, ammonia water is added to the solution, and the pH is controlled to be 13. The temperature is gradually increased to 180°C and stirred. Hydrazine hydrate is added during the heating process, and the addition of hydrazine hydrate is controlled to be 0.3 of the amount of ammonia water added, and the reaction is carried out for 10 hours to obtain the result. The molar ratio of amination graphene to nano-zinc oxide in the amination graphene solution is 10:0.12.

[0037] The grafted polypropylene is prepared by mixing polypropylene, grafted monomer and initiator in a weight ratio of 100:6:0.2, melt-extruding and granulating, the temperature is controlled at 195° C., and the initiator used is TBP.

[0038] The filler is a mixture of calcium carbonate and silicon dioxide, and the mass percentage of calcium carbonate in the filler is 97.5%.

[0039] A method for manufacturing an EPDM rubber material, for preparing the EPDM rubber material as described above, comprises the following steps: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 170°C, and mix for 1.5 hours to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3, vulcanization treatment: the mixed blank is put into a vulcanizer for vulcanization treatment, the vulcanization temperature is controlled to 177° C., the vulcanization time is controlled to 17 min, and the vulcanization pressure is controlled to 4.2 MPa to obtain a finished EPDM rubber material.

[0040] Embodiment 3 An EPDM rubber material comprises 100 parts by weight of EPDM raw rubber, 70 parts by weight of filler, 15 parts by weight of modified polypropylene, 3 parts by weight of vulcanizing agent and 2 parts by weight of zinc methacrylate. The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 13% of graphene composite and 87% of polypropylene composite by mass. The graphene composite has the function of increasing the strength of the polypropylene composite and further improving its heat resistance, corrosion resistance, strength and elastic modulus.

[0041] In order to solve the compatibility problem between graphene and polypropylene materials, the embodiments of the present application adopt the form of a graphene composite and a polypropylene composite.

[0042] The graphene composite is reduced graphene loaded with zinc oxide nanoparticles. The polypropylene composite is grafted polypropylene grafted with a grafting monomer, and the grafting monomer is a combination of maleic anhydride and acrylamide in a molar ratio of 1:0.8.

[0043] It should be mentioned that the reduction of graphene loaded with zinc oxide nanoparticles is achieved by mixing an amination graphene solution with nano-zinc oxide. After ultrasonic treatment for 10 minutes, ammonia water is added to the solution, and the pH is controlled to be 13. The temperature is gradually increased to 180°C and stirred. Hydrazine hydrate is added during the heating process, and the addition of hydrazine hydrate is controlled to be 0.5 of the amount of ammonia water added, and the reaction is carried out for 10 hours to obtain the result. The molar ratio of amination graphene to nano-zinc oxide in the amination graphene solution is 10:0.13.

[0044] The grafted polypropylene is prepared by mixing polypropylene, grafted monomer and initiator in a weight ratio of 100:10:0.6, melt-extruding and granulating, the temperature is controlled at 200° C., and the initiator used is benzoyl peroxide.

[0045] The filler is a mixture of calcium carbonate and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is 98%. The vulcanizing agent is dicumyl peroxide and sulfur in a mass ratio of 15:1.

[0046] A method for manufacturing an EPDM rubber material, for preparing the EPDM rubber material as described above, comprises the following steps: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 175°C, and mix for 1 hour to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3, vulcanization treatment: the mixed blank is put into a vulcanizer for vulcanization treatment, the vulcanization temperature is controlled to 180° C., the vulcanization time is controlled to 15 min, and the vulcanization pressure is controlled to 4.8 MPa to obtain a finished EPDM rubber material.

[0047] Embodiment 4 The difference between Example 4 and Example 1 is that the grafted polypropylene in Example 4 further includes maleic anhydride grafted polypropylene wax added in a weight ratio of 100:0.1 to polypropylene.

[0048] Embodiment 5 The difference between Example 5 and Example 1 is that the grafted polypropylene in Example 5 further includes maleic anhydride grafted polypropylene wax added in a weight ratio of 100:1 to polypropylene.

[0049] Embodiment 6 The difference between the sixth embodiment and the first embodiment is that the EPDM rubber material in the sixth embodiment further includes 0.01 parts of a pigment, which is an azo pigment.

[0050] Embodiment 7 The difference between the seventh embodiment and the first embodiment is that the EPDM rubber material in the seventh embodiment further includes 1 part of a pigment, which is a phthalocyanine pigment.

[0051] Embodiment 8 The difference between the eighth embodiment and the first embodiment is that the EPDM rubber material in the eighth embodiment further comprises 3 parts of a pigment, which is a quinacridone pigment.

[0052] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, graphene is used instead of the graphene composite.

[0053] Comparative Example 2 The difference between Comparative Example 2 and Comparative Example 1 is that in Comparative Example 2, polypropylene is used to replace the polypropylene composite.

[0054] Comparative Example 3 The difference between Comparative Example 3 and Comparative Example 2 is that the graphene-polypropylene composite material in Comparative Example 3 contains 16% by mass of the graphene composite and 84% by mass of the polypropylene composite.

[0055] Comparative Example 4 The difference between Comparative Example 4 and Comparative Example 2 is that the graphene-polypropylene composite material in Comparative Example 4 contains 8% by mass of the graphene composite and 92% by mass of the polypropylene composite.

[0056] Performance Test: 1. According to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", the tensile strength and elongation at break are tested; 2. According to GB / T 531.1-2008 "Test method for indentation hardness of vulcanized rubber or thermoplastic rubber", test hardness; 3. Use 200uW / cm 2 After 500 hours of ultraviolet irradiation, the tensile strength and elongation at break were tested.

[0057] Performance tests were conducted on Examples 1 to 4 and Comparative Examples 1 to 4, and the test results are shown in Tables 1 and 2 below.

[0058] Table 1 Mechanical properties test results

[0059] Table 2 Anti-aging performance test results

[0060] It can be seen from Table 1 above that in Examples 1 to 4 of the present application, graphene is prepared to obtain a graphene composite, polypropylene is prepared to obtain a polypropylene composite, and then modified polypropylene is prepared, thereby effectively solving the compatibility problem between graphene and polypropylene materials, so that the modified polypropylene has stable performance and is synergistically combined with EPDM raw rubber, filler, vulcanizer and zinc methacrylate to achieve the effect of significantly improving mechanical strength and chemical stability.

[0061] At the same time, based on Example 2 and Comparative Examples 3 and 4, it is found that if the addition ratio between the graphene composite and the polypropylene composite is too small, the elongation at break will be too high when the strength is insufficient, or if the addition ratio is too large, it will be difficult to effectively improve the mechanical strength and control the elongation at break when the strength cost is significantly increased.

[0062] As shown in Table 2 above, the graphene polypropylene composite material used as modified polypropylene will effectively improve the anti-aging ability, is suitable for outdoor running track applications, and achieves the purpose of reducing the use cost. Therefore, by using the EPDM rubber material of the present application in the construction of outdoor or indoor running tracks, it will help promote outdoor or indoor exercise and have broad market prospects and economic benefits.

[0063] In summary, the present application provides an EPDM rubber material and a manufacturing method thereof, wherein the EPDM rubber material is prepared by mixing EPDM raw rubber, filler, modified polypropylene and additives, thereby improving the compatibility between the EPDM raw rubber and the filler through the modified polypropylene, so as to improve the chemical resistance and heat resistance of the EPDM raw rubber through the modified polypropylene, and make the EPDM rubber material have improved tensile strength, wear resistance and elasticity, thereby effectively extending the service life of the plastic track prepared by using the material as the plastic track. The manufacturing method of the EPDM rubber material has the effects of simple process, low equipment requirements, environmental protection and suitability for industrial processing and production.

[0064] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0065] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0066] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An EPDM rubber material, characterized in that: The invention comprises 100 parts by weight of EPDM raw rubber, 50-70 parts of filler, 10-15 parts of modified polypropylene, 0.5-3 parts of vulcanizing agent and 0.2-2 parts of auxiliary agent; wherein: The modified polypropylene is a graphene polypropylene composite material, and the graphene polypropylene composite material contains 10-13% of a graphene complex and 87-90% of a polypropylene complex by mass percentage; the graphene complex is reduced graphene loaded with zinc oxide nanoparticles, and the polypropylene complex is a grafted polypropylene obtained by grafting polypropylene with a grafting monomer, and the grafting monomer is at least one of acrylic acid, methacrylic acid and maleic anhydride, or is combined with at least one of styrene and acrylamide in a molar ratio of 1:0.2-0.

8.

2. The EPDM rubber material according to claim 1, characterized in that: The reduced graphene loaded with zinc oxide nanoparticles is obtained by mixing an amination graphene solution with nano zinc oxide, ultrasonically treating the solution for 10 minutes, adding ammonia water to the solution, controlling the pH value to 13, gradually increasing the temperature to 180°C and keeping stirring, adding hydrazine hydrate during the heating process, controlling the addition of hydrazine hydrate to be 0.2-0.5 of the amount of ammonia water, and reacting for 10 hours; wherein the molar ratio of the amination graphene to the nano zinc oxide in the amination graphene solution is 10:0.1-0.

13.

3. The EPDM rubber material according to claim 1, characterized in that: The grafted polypropylene is prepared by mixing, melting, extruding and granulating polypropylene, grafted monomer and initiator in a weight ratio of 100:2-10:0.05-0.6, and the temperature is controlled at 190-200° C. The initiator is dicumyl peroxide, TBP or benzoyl peroxide.

4. The EPDM rubber material according to claim 3, characterized in that: The method also includes adding maleic anhydride grafted polypropylene wax in a weight ratio of 100:0.1-1 parts to polypropylene.

5. The EPDM rubber material according to claim 1, characterized in that: The filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%.

6. The EPDM rubber material according to claim 1, characterized in that: The vulcanizing agent is peroxide and / or sulfur.

7. The EPDM rubber material according to claim 1, characterized in that: The auxiliary agent is zinc methacrylate.

8. The EPDM rubber material according to claim 1, characterized in that: The invention also comprises 0.01 to 3 parts of a pigment, wherein the pigment is an azo pigment, a phthalocyanine pigment or a quinacridone pigment.

9. A method for preparing an EPDM rubber material, for preparing the EPDM rubber material according to any one of claims 1 to 8, characterized in that: The steps include: Step 1, preliminary mixing: put EPDM raw rubber and modified polypropylene into a mixer and mix them, control the temperature of the mixer to 168-175°C, and mix for 1-2 hours to obtain a mixed rubber material; Step 2, comprehensive mixing: add fillers, additives and vulcanizing agents into the mixed rubber material in sequence and stir them evenly simultaneously or in sequence to obtain a mixed blank; Step 3: Vulcanization treatment: Put the mixed blank into a vulcanizer for vulcanization treatment to obtain a finished EPDM rubber material.

10. The method for manufacturing an EPDM rubber material according to claim 9, characterized in that: The temperature of the vulcanization treatment is controlled at 175-180° C., the vulcanization time is controlled at 15-20 min, and the vulcanization pressure is controlled at 4-4.8 MPa.

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