Electrolyte-resistant ethylene propylene diene monomer and preparation method and application thereof

Abstract

The invention relates to the technical field of rubber materials, in particular to electrolyte-resistant ethylene propylene diene monomer and a preparation method and application thereof. The electrolyte-resistant ethylene propylene diene monomer is prepared from the following components in parts by mass: 100 parts of ethylene propylene diene monomer, 0.5-2 parts of carbon black, 40-70 parts of filler, 1-4 parts of a coupling agent, 0.5-3 parts of a vulcanizing agent and 1-4 parts of an assistant crosslinker, the filler is barium sulfate subjected to surface modification treatment by a titanate coupling agent. The electrolyte-resistant ethylene propylene diene monomer which is resistant to high temperature and acid corrosion and has the electrical performance required by the battery pack is provided, the preparation method is simple, convenient and easy to operate, the cost is low, the efficiency is high, and the prepared electrolyte-resistant ethylene propylene diene monomer has good physical and mechanical performance and electrical performance; meanwhile, the material shows good heat aging resistance and electrolyte resistance, has a good application prospect, and can be particularly applied to lithium battery sealing elements.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to an electrolyte-resistant ethylene propylene diene monomer rubber and a preparation method and application thereof. Background Art

[0002] With the development of power batteries, lithium batteries have become the mainstream of power batteries. Rubber seals are the most critical components for power lithium battery sealing in the new energy vehicle industry chain. They are used to seal lithium batteries, prevent electrolyte leakage, avoid environmental pollution, and ensure the use environment and composition changes of the electrolyte. They are key components of power lithium batteries.

[0003] EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated dienes. It is a type of EPDM. Because its main chain is composed of chemically stable saturated hydrocarbons, it has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance. It can be widely used in automotive parts, waterproof materials for construction, wire and cable sheaths, heat-resistant hoses, tapes, automotive seals, etc. EPDM is often used in lithium battery seals because of its good insulation properties. However, EPDM filled with white carbon black is not resistant to corrosion in high-temperature electrolytes.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an electrolyte-resistant EPDM rubber and a preparation method and application thereof, aiming to solve the problem that the existing EPDM rubber is not resistant to corrosion in high-temperature electrolytes.

[0006] The technical solution of the present invention is as follows:

[0007] The first aspect of the present invention provides an electrolyte-resistant ethylene propylene diene monomer rubber, which is prepared by including the following components, measured by weight: 100 parts of ethylene propylene diene monomer rubber, 0.5 to 2 parts of carbon black, 40 to 70 parts of filler, 1 to 4 parts of coupling agent, 0.5 to 3 parts of vulcanizing agent, and 1 to 4 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0008] Optionally, the electrolyte-resistant EPDM rubber is prepared from the following components, measured by weight: 100 parts of EPDM rubber, 0.5-2 parts of carbon black, 40-70 parts of filler, 1-4 parts of coupling agent, 0.5-3 parts of vulcanizing agent, and 1-4 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0009] Optionally, the electrolyte-resistant EPDM rubber is prepared from the following components, measured by weight: 100 parts of EPDM rubber, 1 part of carbon black, 60 parts of filler, 1 part of coupling agent, 2 parts of vulcanizing agent, and 2 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0010] Optionally, the EPDM rubber has a Mooney viscosity of 60-70MU, an ethylene content of 40%-60%, and an ethylidene norbornene content of 6%-11%.

[0011] Optionally, the carbon black is one or more of carbon black N330, carbon black N550, and carbon black N990; the coupling agent is a silane coupling agent, and the silane coupling agent is one or more of silane coupling agent A-172, silane coupling agent KH570, silane coupling agent WD-10, and silane coupling agent A-151; the vulcanizing agent is one or more of 2,4-di-tert-butyl peroxide isopropylbenzene, diisopropylbenzene peroxide, and 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane; the auxiliary cross-linking agent is one or more of triallyl isocyanurate, triallyl cyanurate, and N,N'-m-phenylene bismaleimide.

[0012] A second aspect of the present invention provides a method for preparing electrolyte-resistant EPDM rubber, comprising the steps of:

[0013] S1. Weigh each component according to the mass ratio and set aside;

[0014] S2, plasticizing the EPDM rubber in an internal mixer, adding carbon black, filler and coupling agent for internal mixing, and obtaining a mixed rubber after discharging and sheeting;

[0015] S3, mixing the mixed rubber, vulcanizing agent and co-crosslinking agent in an open mill, and molding and vulcanizing the sheet to obtain the electrolyte-resistant EPDM rubber.

[0016] Optionally, the temperature of the plasticizing is 100-110°C, and the time is 15-20 min; the temperature of the banburying is 110-120°C, and the time is 30-40 min; the temperature of the mixing is 20-40°C, and the time is 15-20 min.

[0017] Optionally, the compression molding temperature is 175-180° C., the pressure is 4.4-5.0 MPa, and the time is 8-10 min.

[0018] Optionally, the vulcanization treatment is a two-stage vulcanization treatment, the temperature of the two-stage vulcanization treatment is 120-150° C., and the time is 30-60 minutes.

[0019] A third aspect of the present invention provides a use of the electrolyte-resistant EPDM rubber of the present invention in a lithium battery seal.

[0020] Beneficial effects: The present invention provides an electrolyte-resistant EPDM rubber which is resistant to high temperature and acid corrosion and has the electrical properties required for a battery pack. The preparation method is simple and easy to operate, has low cost and high efficiency. The prepared electrolyte-resistant EPDM rubber has excellent physical and mechanical properties and electrical properties, and also exhibits excellent heat aging resistance and electrolyte resistance, and has good application prospects, especially can be used in lithium battery seals. DETAILED DESCRIPTION

[0021] The present invention provides an electrolyte-resistant EPDM rubber and a preparation method and application thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] An embodiment of the present invention provides an electrolyte-resistant ethylene propylene diene monomer rubber, which is prepared by including the following components, measured by weight: 100 parts of ethylene propylene diene monomer rubber, 0.5 to 2 parts of carbon black, 40 to 70 parts of filler, 1 to 4 parts of coupling agent, 0.5 to 3 parts of vulcanizing agent, and 1 to 4 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0023] The embodiment of the present invention starts with selecting a filler that is resistant to some weak acids such as hydrofluoric acid and has the electrical properties required for a battery pack, and uses barium sulfate that has been surface-modified with a titanate coupling agent as a filler, which is combined with EPDM rubber, carbon black, a coupling agent, a vulcanizing agent, a cross-linking agent and other components to form an electrolyte-resistant EPDM rubber. The electrolyte-resistant EPDM rubber has excellent physical and mechanical properties and electrical properties, and also exhibits excellent heat aging resistance and electrolyte resistance, and has good application prospects.

[0024] The electrolyte-resistant EPDM rubber provided in the embodiment of the present invention has good physical and mechanical properties, heat aging resistance and carbonate solvent resistance. A small amount of carbon black plays a coloring role without affecting the material's voltage-resistant insulation performance. Barium sulfate increases its reinforcing effect on the material under the action of a coupling agent. At the same time, the addition of barium sulfate allows the material to have excellent resistance to electrolyte corrosion. The vulcanizing agent and the cross-linking aid play a decisive role in the molding of the material. Therefore, an electrolyte-resistant EPDM rubber with excellent comprehensive performance can be provided.

[0025] The filler used in the embodiment of the present invention is barium sulfate (B-440H) surface-modified with a titanate coupling agent, which can be purchased directly. The surface-modified barium sulfate has excellent resistance to strong acids, such as hydrofluoric acid.

[0026] In some embodiments, the electrolyte resistant EPDM rubber is prepared from the following components, measured by weight: 100 parts of EPDM rubber, 0.5-2 parts of carbon black, 40-70 parts of filler, 1-4 parts of coupling agent, 0.5-3 parts of vulcanizing agent, and 1-4 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0027] In some preferred embodiments, the electrolyte-resistant EPDM rubber is prepared from the following components, measured by weight: 100 parts of EPDM rubber, 1 part of carbon black, 60 parts of filler, 1 part of coupling agent, 2 parts of vulcanizing agent, and 2 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

[0028] In some embodiments, the Mooney viscosity of the EPDM rubber is 60-70MU, the ethylene content is 40%-60%, and the ethylidene norbornene (referring to 5-ethylidene-2-norbornene) content is 6%-11%. The EPDM rubber is selected, and the reinforcing effect of the EPDM rubber with barium sulfate is not as good as that of carbon black. At the same time, the hardness of the product should be moderate. The Mooney viscosity of 60-70MU is the best. The ethylene content of 40%-60% not only gives the material good physical and mechanical properties, but also good processing properties. The ethylidene norbornene content of 6%-11% allows the material to have sufficient crosslinking density, so that the crosslinking density is not too low or too high to affect the material's physical and mechanical properties, thermal aging properties, etc.

[0029] In some embodiments, the carbon black is one or more of carbon black N330, carbon black N550, and carbon black N990.

[0030] In some embodiments, the coupling agent is a silane coupling agent, and the silane coupling agent is one or more of silane coupling agent A-172 (vinyl tri-(2-methoxyethoxy)-silane), silane coupling agent KH570 (γ-(methacryloyloxy)propyl trimethoxysilane), silane coupling agent WD-10 (n-dodecyl trimethoxysilane), and silane coupling agent A-151 (vinyl triethoxysilane).

[0031] In some embodiments, the vulcanizing agent is one or more of 2,4-di-tert-butyl cumene peroxide, dicumyl peroxide, and 2,5-dimethyl-2,5-di-tert-butylhexane peroxide.

[0032] In some embodiments, the auxiliary cross-linking agent is one or more of triallyl isocyanurate, triallyl cyanurate, and N,N'-m-phenylene bismaleimide.

[0033] The embodiment of the present invention further provides a method for preparing the electrolyte resistant EPDM rubber according to any of the above embodiments, wherein the method comprises the steps of:

[0034] S1. Weigh each component according to the mass ratio and set aside;

[0035] S2, plasticizing the EPDM rubber in an internal mixer, adding carbon black, filler and coupling agent for internal mixing, and obtaining a mixed rubber after discharging and sheeting;

[0036] S3, mixing the mixed rubber, vulcanizing agent and co-crosslinking agent in an open mill, and molding and vulcanizing the sheet to obtain the electrolyte-resistant EPDM rubber.

[0037] The embodiment of the present invention provides a method for preparing electrolyte-resistant EPDM rubber. First, each component is prepared according to the mass fraction ratio for standby use. The EPDM rubber is plasticized in an internal mixer to soften the EPDM raw rubber and increase its plasticity at a higher temperature, so as to facilitate the addition and dispersion of fillers in the next process. Then, carbon black, fillers and coupling agents are added for internal mixing to make the fillers dispersed evenly in the EPDM rubber. After the material is discharged and sliced, the mixed rubber is obtained. Then, the mixed rubber, vulcanizing agent and cross-linking agent are mixed in an open mixer to make the vulcanizing agent and cross-linking agent dispersed evenly. After the slice is removed, it is subjected to compression molding and vulcanization treatment, wherein the purpose of compression molding is to provide conditions for cross-linking reaction by pressurization and heating, and the purpose of vulcanization treatment is to cross-link molecules into a network structure, and finally the electrolyte-resistant EPDM rubber is obtained. The prepared electrolyte-resistant EPDM rubber has good physical and mechanical properties and electrical properties, and also shows good heat aging resistance and electrolyte resistance, and has good application prospects.

[0038] In some embodiments, the temperature of the plasticizing is 100-110° C., and the time is 15-20 min. Within the range of the plasticizing temperature and time, the EPDM rubber is sufficiently softened to facilitate subsequent filling of fillers.

[0039] In some embodiments, the banburying temperature is 110-120° C. and the time is 30-40 min. Within the banburying temperature and time range, the filler and the EPDM rubber are fully mixed and uniform.

[0040] In some embodiments, the mixing temperature is 20 to 40° C. and the mixing time is 15 to 20 minutes. Within the mixing temperature and time range, the vulcanizing agent and the cross-linking aid are evenly dispersed in the EPDM rubber.

[0041] In some embodiments, the compression molding temperature is 175-180° C., the pressure is 4.4-5.0 MPa, and the time is 8-10 min. Within the temperature, pressure, and time range of the compression molding, sufficient cross-linking is achieved to achieve a good vulcanization effect.

[0042] In some embodiments, the vulcanization treatment is a two-stage vulcanization treatment, the temperature of the two-stage vulcanization treatment is 120-150° C., and the time is 30-60 minutes. Within the temperature and time range of the two-stage vulcanization treatment, crosslinking reaction and volatilization and decomposition of small molecules are further performed.

[0043] An embodiment of the present invention also provides a use of the electrolyte-resistant EPDM rubber described in any of the aforementioned embodiments in a lithium battery seal.

[0044] The present invention will be further described below by means of specific examples.

[0045] Example 1

[0046] The present embodiment provides an electrolyte-resistant EPDM rubber and a preparation method thereof. The electrolyte-resistant EPDM rubber is prepared from the following components by weight: 100 parts of EPDM rubber with a Mooney viscosity of 70MU, an ethylene content of 45%, and a 5-ethylidene-2-norbornene content of 8.0%, 1 part of carbon black N330, 60 parts of barium sulfate (B-440H) filler modified with a surface titanate coupling agent, 1 part of silane coupling agent A-172, 2 parts of 2,4-di-tert-butyl peroxide isopropylbenzene (BIPB) vulcanizing agent, and 2 parts of triallyl isocyanurate (TAIC) cross-linking agent. The preparation method of the electrolyte-resistant EPDM rubber is:

[0047] S1. Weigh each component according to the mass ratio and set aside;

[0048] S2, putting the EPDM rubber into an internal mixer for plastication, controlling the material temperature at 100°C for 20 minutes, until the rubber material is agglomerated, then adding carbon black N330, barium sulfate filler surface-modified by titanate coupling agent and silane coupling agent A-172, and mixing at 115°C for 30 minutes, discharging the material and sheeting to obtain a mixed rubber, and cooling the material temperature to about 40°C;

[0049] S3. The cooled mixed rubber, BIPB vulcanizing agent and TAIC cross-linking agent are mixed evenly in an open mill, and the temperature is controlled to be 40°C for 15 minutes. After unrolling, the mixed rubber is molded at 180°C and 4.4 MPa for 10 minutes, and then a second-stage vulcanization treatment is performed at 150°C for 30 minutes to obtain the final electrolyte-resistant EPDM rubber.

[0050] Example 2

[0051] The present embodiment provides an electrolyte-resistant EPDM rubber and a preparation method thereof. The electrolyte-resistant EPDM rubber is prepared from the following components by weight: 100 parts of EPDM rubber with a Mooney viscosity of 70MU, an ethylene content of 45%, and a 5-ethylidene-2-norbornene content of 8.0%, 1 part of carbon black N550, 60 parts of barium sulfate (B-440H) filler modified with a surface titanate coupling agent, the coupling agent includes 0.5 parts of silane coupling agent KH570 and 0.5 parts of WD-10, 2 parts of diisopropylbenzene peroxide (DCP) vulcanizing agent, and 2 parts of triallyl isocyanurate (TAIC) cross-linking agent. The preparation method of the electrolyte-resistant EPDM rubber is the same as that of Example 1, except that the raw material formula composition of the electrolyte-resistant EPDM rubber is different, and the corresponding raw materials are replaced during preparation.

[0052] Example 3

[0053] The present embodiment provides an electrolyte-resistant EPDM rubber and a preparation method thereof. The electrolyte-resistant EPDM rubber is prepared from the following components by weight: 100 parts of EPDM rubber with a Mooney viscosity of 60MU, an ethylene content of 51%, and a 5-ethylidene-2-norbornene content of 6.5%, 1 part of carbon black N550, 60 parts of barium sulfate (B-440H) filler modified with a surface titanate coupling agent, 1 part of silane coupling agent KH570, 2 parts of diisopropylbenzene peroxide (DCP) vulcanizing agent, and 2 parts of triallyl cyanurate (TAC) cross-linking agent. The preparation method of the electrolyte-resistant EPDM rubber is the same as that of Example 1, except that the raw material formula composition of the electrolyte-resistant EPDM rubber is different, and the corresponding raw materials are replaced during preparation.

[0054] Comparative Example 1

[0055] This comparative example provides an electrolyte-resistant EPDM rubber and a preparation method thereof. The electrolyte-resistant EPDM rubber is prepared from the following components by weight: 100 parts of EPDM rubber with a Mooney viscosity of 70MU, an ethylene content of 45%, and a 5-ethylidene-2-norbornene content of 8.0%, 1 part of carbon black N330, 40 parts of BASF surface-treated calcined kaolin Translink445 and 20 parts of basic white carbon black as fillers, 1 part of silane coupling agent KH570 and 1 part of WD-10 as coupling agents, 2 parts of 2,4-di-tert-butyl peroxide isopropylbenzene (BIPB) vulcanizing agent, and 2 parts of triallyl isocyanurate (TAIC) cross-linking agent. The preparation method of the electrolyte-resistant EPDM rubber is the same as that of Example 1, except that the raw material formula composition of the electrolyte-resistant EPDM rubber is different, and the corresponding raw materials are replaced during preparation.

[0056] Comparative Example 2

[0057] This comparative example provides an electrolyte-resistant EPDM rubber and a preparation method thereof. The electrolyte-resistant EPDM rubber is prepared from the following components by weight: 100 parts of EPDM rubber with a Mooney viscosity of 60MU, an ethylene content of 51%, and a 5-ethylidene-2-norbornene content of 6.5%, 1 part of carbon black N550, 20 parts of 5000 mesh silica powder and 40 parts of calcined clay as fillers, 1 part of silane coupling agent A-172 and 1 part of WD-10 as coupling agents, 2 parts of diisopropylbenzene peroxide (DCP) vulcanizing agent, and 2 parts of triallyl cyanurate (TAC) cross-linking agent. The preparation method of the electrolyte-resistant EPDM rubber is the same as that of Example 1, except that the raw material formula composition of the electrolyte-resistant EPDM rubber is different, and the corresponding raw materials are replaced during preparation.

[0058] The physical and mechanical properties and electrical properties of the electrolyte-resistant EPDM rubber prepared in the above Examples 1-3 and Comparative Examples 1-2 were tested, including hardness, tensile strength, elongation at break, insulation resistance and withstand voltage leakage current, etc. The specific test standards and methods are the hardness test standard (GB / T 531.1), the tensile strength and elongation at break test standard (GB / T 528), the insulation resistance test standard (GB / T 31838.4), and the withstand voltage test standard (GB / T 1408.1).

[0059] Table 1 shows the physical, mechanical and electrical properties of the electrolyte-resistant EPDM rubbers prepared in Examples 1-3 and Comparative Examples 1-2.

[0060] Table 1

[0061]

[0062] According to the data in Table 1, the electrolyte-resistant EPDM rubber provided by the present invention has excellent physical and mechanical properties and electrical properties, and its performance is better than that of the electrolyte-resistant EPDM rubber in Comparative Examples 1 and 2.

[0063] The thermal aging performance of the electrolyte-resistant EPDM rubber prepared in the above-mentioned embodiments 1-3 and comparative examples 1-2, as well as the high-temperature electrolyte aging performance and the room-temperature electrolyte aging performance were tested. Specifically, the testing method for the thermal aging performance is to age at 120°C for 70 hours, and check the tensile strength change rate, the elongation at break change rate, the hardness change rate, the mass change rate, and the insulation withstand voltage performance of the material; the testing method for the high-temperature electrolyte aging performance is to soak at 70°C for 7 days, wash and bake at 80°C for 1 hour, check whether there are crystals on the surface of the material, no corrosion, blistering and deformation, and check the volume change rate, mass change rate, and insulation withstand voltage performance of the material; the testing method for the room-temperature electrolyte aging performance is to soak at room temperature 25°C for 30 days, wash and bake at 80°C for 1 hour, check whether there are crystals on the surface of the material, no corrosion, blistering and deformation, and check the volume change rate, mass change rate, and insulation withstand voltage performance of the material.

[0064] Table 2 shows the thermal aging performance data (70h@120°C) of the electrolyte-resistant EPDM rubber prepared in Examples 1-3 and Comparative Examples 1-2.

[0065] Table 2

[0066]

[0067] According to the data in Table 2, the electrolyte-resistant EPDM rubber provided by the present invention has good heat aging performance, and its performance is better than that of the electrolyte-resistant EPDM rubber in Comparative Examples 1 and 2.

[0068] Table 3 shows the high temperature electrolyte aging resistance performance data (168h@70°C) of the electrolyte resistant EPDM rubber prepared in Examples 1-3 and Comparative Examples 1-2.

[0069] Table 3

[0070]

[0071] According to the data in Table 3, the electrolyte-resistant EPDM rubber provided by the present invention has excellent high-temperature electrolyte aging resistance, and its performance is better than that of the electrolyte-resistant EPDM rubber in Comparative Examples 1 and 2.

[0072] Table 4 shows the room temperature electrolyte aging resistance performance data (30d@room temperature) of the electrolyte resistant EPDM rubber prepared in Examples 1-3 and Comparative Examples 1-2.

[0073] Table 4

[0074]

[0075] According to the data in Table 4, the electrolyte-resistant EPDM rubber provided by the present invention has good room-temperature electrolyte aging resistance, and its performance is better than that of the electrolyte-resistant EPDM rubber in Comparative Examples 1 and 2.

[0076] In summary, the electrolyte-resistant EPDM rubber provided by the present invention has excellent physical and mechanical properties and electrical properties, and also exhibits excellent heat aging resistance and electrolyte resistance. In addition, the preparation method of the present invention is simple and easy to operate, has low cost and high efficiency, and has good application prospects.

[0077] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An electrolyte-resistant EPDM rubber, characterized in that: The invention is prepared by comprising the following components in parts by mass: 100 parts of EPDM rubber, 0.5 to 2 parts of carbon black, 40 to 70 parts of filler, 1 to 4 parts of coupling agent, 0.5 to 3 parts of vulcanizing agent and 1 to 4 parts of cross-linking aid; the filler is barium sulfate surface-modified by a titanate coupling agent.

2. The electrolyte-resistant EPDM rubber according to claim 1, characterized in that: The electrolyte-resistant EPDM rubber is prepared from the following components in parts by mass: 100 parts of EPDM rubber, 0.5 to 2 parts of carbon black, 40 to 70 parts of filler, 1 to 4 parts of coupling agent, 0.5 to 3 parts of vulcanizing agent, and 1 to 4 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

3. The electrolyte-resistant EPDM rubber according to claim 1, characterized in that: The electrolyte-resistant EPDM rubber is prepared from the following components in parts by mass: 100 parts of EPDM rubber, 1 part of carbon black, 60 parts of filler, 1 part of coupling agent, 2 parts of vulcanizing agent, and 2 parts of cross-linking agent; the filler is barium sulfate surface-modified with a titanate coupling agent.

4. The electrolyte-resistant EPDM rubber according to claim 1, characterized in that: The Mooney viscosity of the EPDM rubber is 60-70MU, the ethylene content is 40%-60%, and the ethylidene norbornene content is 6%-11%.

5. The electrolyte-resistant EPDM rubber according to claim 1, characterized in that: The carbon black is one or more of carbon black N330, carbon black N550, and carbon black N990; the coupling agent is a silane coupling agent, and the silane coupling agent is one or more of silane coupling agent A-172, silane coupling agent KH570, silane coupling agent WD-10, and silane coupling agent A-151; the vulcanizing agent is one or more of 2,4-di-tert-butyl peroxide isopropylbenzene, diisopropylbenzene peroxide, and 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane; the auxiliary cross-linking agent is one or more of triallyl isocyanurate, triallyl cyanurate, and N,N'-m-phenylene bismaleimide.

6. A method for preparing the electrolyte-resistant EPDM rubber according to any one of claims 1 to 5, characterized in that: Includes steps: S1. Weigh each component according to the mass ratio and set aside; S2, plasticizing the EPDM rubber in an internal mixer, adding carbon black, filler and coupling agent for internal mixing, and obtaining a mixed rubber after discharging and sheeting; S3, mixing the mixed rubber, vulcanizing agent and co-crosslinking agent in an open mill, and molding and vulcanizing the sheet to obtain the electrolyte-resistant EPDM rubber.

7. The method for preparing electrolyte resistant EPDM rubber according to claim 6, characterized in that: The temperature of the plasticizing is 100-110° C., and the time is 15-20 min; the temperature of the banburying is 110-120° C., and the time is 30-40 min; the temperature of the mixing is 20-40° C., and the time is 15-20 min.

8. The method for preparing electrolyte resistant EPDM rubber according to claim 6, characterized in that: The compression molding process is performed at a temperature of 175 to 180° C., a pressure of 4.4 to 5.0 MPa, and a time of 8 to 10 minutes.

9. The method for preparing electrolyte resistant EPDM rubber according to claim 8, characterized in that: The vulcanization treatment is a two-stage vulcanization treatment, the temperature of the two-stage vulcanization treatment is 120-150° C., and the time is 30-60 minutes.

10. Use of the electrolyte-resistant EPDM rubber according to any one of claims 1 to 5 in lithium battery seals.

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