Rubber and method of making and use thereof

Abstract

This invention belongs to the field of rubber, specifically relating to a rubber, its preparation method, and its application. The invention discloses a rubber comprising, by weight, the following raw material components: 100 parts EPDM; 5-10 parts zinc oxide; 0.5-1.5 parts stearic acid; 7-8 parts 40% dicumyl peroxide; 0.2-0.4 parts tetramethylthiuram disulfide; 0.5-0.8 parts 80% sulfur; 35-40 parts carbon black; 25-27 parts silica; 0.4-0.6 parts silane coupling agent; 14-20 parts naphthenic oil; 0.6-1 part paraffin wax; and 1-3 parts single-walled carbon nanotubes; wherein the weight of EPDM is not less than 50% of the total weight of the rubber. The beneficial effect of this invention is that it provides a rubber whose volume resistivity and other properties simultaneously meet the requirements of the T / CEC China Electricity Council standard "Technical Conditions and Test Methods for Electric Power Fittings Rubber and Rubber Products".

Description

Technical Field

[0001] This invention belongs to the field of rubber, and more specifically, relates to a rubber, its preparation method, and its application. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber possesses advantages such as electrical insulation, ozone resistance, aging resistance, good water repellency, and flame retardancy, making it widely used in the field of electrical insulation. Compared to silicone rubber, EPDM rubber has advantages in terms of better chemical corrosion resistance, higher mechanical strength, and lower price.

[0003] Chinese Patent No. (I) CN201310175742 discloses a nonlinear conductive insulating material based on EPDM rubber, which describes the insulating application of carbon nanotubes and EPDM rubber; Chinese Patent No. (II) CN113831652 A discloses a carbon-modified high-conductivity foamed EPDM rubber, which utilizes conductive carbon black to improve the conductivity of the foamed material. Both patents represent inventions in the fields of insulation and high conductivity.

[0004] Chinese Patent No. (III) CN1560876A discloses a rubber damping component for ultra-high voltage transmission line spacers, which is prepared by using a combination of ethylene propylene and butyl rubber, resulting in a volume resistivity of 1.1 × 10⁻⁶. 6 ~1.1×10 8 Materials with Ω·cm; Chinese Patent (IV) CN201310745501 discloses a material and preparation method for a damping spacer rubber component for ultra-high voltage transmission lines, which describes a material with added ultraviolet absorber UV-12 and a volume resistivity of 3.5×10 Ω·cm. 3 The material is Ω·cm; Chinese Patent (V) CN116214798A discloses a novel damping spacer rubber component for installation in ultra-high voltage transmission lines, which describes a method for removing flash from the rubber component. The above three patents describe the damping spacer from the perspectives of using different types of rubber, adding ultraviolet absorbers, and removing flash.

[0005] The above patents do not provide a detailed description of the performance requirements of the damping spacer formulation as specified in the T / CEC (China Electricity Council) standard "Technical Conditions and Test Methods for Electric Power Fittings Rubber and Rubber Products" drafted under the leadership of the China Electric Power Research Institute, and some performance characteristics do not meet the standard requirements, such as a volume resistivity of 1.1 × 10⁻⁶. 5 ~2×10 7 Ω·cm, none of the technical solutions in the above patents can meet this requirement of the standard. Summary of the Invention

[0006] 1. Technical problems to be solved:

[0007] In the existing technology, the volume resistivity and other properties of rubber damping shock absorbers for ultra-high voltage power transmission cannot simultaneously meet the requirements of the T / CEC China Electricity Council standard "Technical Conditions and Test Methods for Rubber and Rubber Products for Power Fittings" (T / CEC447-2021).

[0008] 2. Technical Solution

[0009] To address the aforementioned technical problems, in a first aspect, the present invention provides a rubber comprising, by weight, the following raw material components:

[0010] 100 copies of EPDM;

[0011] 5-10 parts zinc oxide;

[0012] Stearic acid 0.5–1.5 parts;

[0013] 7-8 parts of 40% dicumyl peroxide;

[0014] 0.2–0.4 parts of tetramethylthiuram disulfide;

[0015] Sulfur content 80%, 0.5-0.8 parts;

[0016] 35-40 parts carbon black;

[0017] 25-27 parts of silica;

[0018] 0.4–0.6 parts of silane coupling agent;

[0019] 14-20 parts of naphthenic oil;

[0020] Paraffin wax 0.6 to 1 part;

[0021] 1-3 parts of single-walled carbon nanotubes;

[0022] Of which, the weight of EPDM shall not be less than 50% of the total weight of rubber.

[0023] Furthermore, EPDM includes Jilin Chemical EPDM and / or Mitsui EPDM.

[0024] Furthermore, the weight ratio of Jilin Chemical EPDM to Mitsui EPDM is 0.01 to 0.5.

[0025] Furthermore, the carbon black is a high-abrasion-resistant carbon black; the silica is a precipitated silica.

[0026] Furthermore, paraffin wax has a melting point of 56–58°C.

[0027] Furthermore, the diameter of the single-walled carbon nanotubes is 11–15 nm, and the tube length is 16–20 μm.

[0028] Furthermore, the rubber was tested according to the method in GB / T 2439, and its volume resistivity was 1.1 × 10⁻⁶. 5 ~2×10 7 Ω·cm.

[0029] Secondly, the present invention provides a method for preparing the aforementioned rubber, comprising the following steps:

[0030] S1. Internal mixing: Jilin Chemical EPDM and Mitsui EPDM are added and mixed in an internal mixer, then single-walled carbon nanotubes, zinc oxide and stearic acid are added and mixed, then carbon black, silica, paraffin and naphthenic oil are added and mixed, and finally the masterbatch is obtained by lifting the plug and discharging the rubber.

[0031] S2. Open mill vulcanization: The masterbatch obtained from step S1. de-gumming is wrapped on the rollers of the open mill, and compounding agents are added: 40% of dicumyl peroxide, tetramethylthiuram disulfide, 80% of sulfur and silane coupling agent. After all the compounding agents are absorbed into the masterbatch, the mill is turned over and finally sheeted to obtain the compound.

[0032] S3. Molding: The compound obtained in step S3. is formed into a blank of standard weight and shape;

[0033] S4. Vulcanization: The preform formed in step S4 is filled into the mold cavity and vulcanized to obtain rubber.

[0034] Furthermore, in step S1, the mixing time for adding Jilin Chemical EPDM and Mitsui EPDM is 45-55 seconds.

[0035] Furthermore, in step S1, the mixing time for adding single-walled carbon nanotubes, zinc oxide, and stearic acid is 10-20 seconds.

[0036] Furthermore, in step S1, the mixing time for adding carbon black, silica, paraffin wax, and naphthenic oil is 100-120 seconds.

[0037] Furthermore, in step S1, the time for lifting the thrombus is 10 to 20 seconds.

[0038] Furthermore, in step S1, the glue discharge temperature is 110-120℃.

[0039] Furthermore, in step S2, the turning operation method adopts one or more of the following: triangular wrapping method, rolling method, oblique cutting method, and thin-passing method.

[0040] Furthermore, in step S3, the compound is extruded and cut using a high-pressure preforming device to obtain a preform of standard weight and shape.

[0041] Furthermore, in step S4, the vulcanization process is carried out at a vulcanization temperature of 160–180°C, a vulcanization pressure of 15–20 MPa, and a vulcanization time of 15–20 min.

[0042] Thirdly, the present invention provides an application of rubber, wherein the rubber is the aforementioned rubber or rubber prepared by the aforementioned method of preparing rubber; the rubber is applied to rubber damping shock absorbers for ultra-high voltage power transmission.

[0043] 3. Beneficial effects

[0044] The beneficial effects of this invention are as follows:

[0045] This invention provides a rubber whose volume resistivity and other properties simultaneously meet the requirements of the T / CEC China Electricity Council standard "Technical Conditions and Test Methods for Electric Fittings Rubber and Rubber Products".

[0046] More specifically, the technical solution of the present invention also produces the following beneficial effects:

[0047] The rubber of this invention contains single-walled carbon nanotubes, which can improve conductivity and is insensitive to environmental and time factors, maintaining its conductivity over a long period. Simultaneously, the single-walled carbon nanotubes also endow the rubber with excellent physical and mechanical properties, high elasticity, and low compression set, meeting the requirements for suitable damping and volume resistivity in this rubber formulation.

[0048] The rubber of this invention has reasonable components and contents, which can ensure that the volume resistivity meets the T / CEC 447-2021 standard, and that other parameters, including hardness and elongation at break, also meet the requirements of the standard. Detailed Implementation

[0049] Embodiments of this disclosure will now be described in more detail. It should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, implementation methods and embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0050] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0051] This specific embodiment provides a rubber, which, by weight, comprises the following raw material components:

[0052] 100 copies of EPDM;

[0053] 5-10 parts zinc oxide;

[0054] Stearic acid 0.5–1.5 parts;

[0055] 7-8 parts of 40% dicumyl peroxide;

[0056] 0.2–0.4 parts of tetramethylthiuram disulfide;

[0057] Sulfur content 80%, 0.5-0.8 parts;

[0058] 35-40 parts carbon black;

[0059] 25-27 parts of silica;

[0060] 0.4–0.6 parts of silane coupling agent;

[0061] 14-20 parts of naphthenic oil;

[0062] Paraffin wax 0.6 to 1 part;

[0063] 1-3 parts of single-walled carbon nanotubes;

[0064] The weight of the EPDM shall not be less than 50% of the total weight of the rubber.

[0065] Since diisopropylbenzene peroxide is listed in the "List of Easily Explosive Hazardous Chemicals" and is controlled in accordance with the "Regulations on the Administration of Security of Easily Explosive Hazardous Chemicals," a 40% content diisopropylbenzene peroxide is used. The aforementioned 40% content diisopropylbenzene peroxide is a mixture of diisopropylbenzene peroxide and kaolin. In this specific embodiment, the 40% content diisopropylbenzene peroxide is a mixture of 40% diisopropylbenzene peroxide and 60% kaolin. Since high-purity sulfur belongs to Class 2 hazardous chemicals and is flammable, an 80% content sulfur is used. The aforementioned 80% content sulfur is a mixture of sulfur and EPDM rubber. In this specific embodiment, the 80% content sulfur is a rubber masterbatch obtained by pre-dispersing 80% sulfur and 20% high-polymer EPDM rubber.

[0066] The single-walled carbon nanotubes used in this specific embodiment are TUBALL manufactured by Occidental Biotech. TM MATRIX 610 model.

[0067] The EPDM mentioned above stands for Ethylene Propylene Diene Monomer, which is a terpolymer of ethylene, propylene, and a non-conjugated diene.

[0068] Furthermore, EPDM includes Jilin Chemical EPDM and / or Mitsui EPDM.

[0069] Furthermore, the weight ratio of Jilin Chemical EPDM to Mitsui EPDM is 0.01 to 0.5.

[0070] Furthermore, the weight ratio of Jilin Chemical EPDM and Mitsui EPDM can be selected from any point within the following range:

[0071] 0.01~0.5, 0.01~0.1, 0.1~0.3, 0.3~0.5, 0.01~0.3, 0.1~0.5.

[0072] The Jilin Petrochemical EPDM used in this specific embodiment is the 4045 model EPDM produced by Jilin Petrochemical Company of China National Petroleum Corporation, and the Mitsui EPDM is the 3110M model EPDM produced by Mitsui Chemicals Co., Ltd.

[0073] Using the above technical solution, the rubber of this invention uses EPDM rubber, which has good weather aging resistance, as the matrix. This differs from using two different rubber types together, resulting in better compatibility and dispersibility, and is also more economical. Furthermore, excessive rubber viscosity is detrimental to processing, while excessively low viscosity leads to a decrease in the rubber's mechanical strength. In this invention, Jilin Chemical EPDM and Mitsui EPDM are selected, and their ratio is adjusted appropriately to achieve a balance between viscosity and flowability. This satisfies both the strength requirements and the processing performance requirements during rubber production.

[0074] Furthermore, the carbon black is a high-abrasion-resistant carbon black; the silica is a precipitated silica.

[0075] The aforementioned high abrasion-resistant carbon black is produced by the oil furnace method, with a particle size of 26–30 nm and a specific surface area of ​​80–110 m². 2 / g; Oxygen content 0.5%–1.0%; Hydrogen content 0.27%–0.34%; Density 1.8g / cm³ 3 Left and right. In this specific embodiment, the high abrasion-resistant carbon black is N330 high abrasion-resistant carbon black produced by Orion Corporation.

[0076] High abrasion-resistant carbon black has strong abrasion resistance, can give rubber higher tensile strength and tear strength, and has a certain degree of electrical conductivity, so it is a more preferred solution.

[0077] The aforementioned precipitated silica refers to a reinforcing filler material obtained by the precipitation reaction of silicates and inorganic acids. Adding a small amount of precipitated silica to rubber can significantly improve the mechanical strength, wear resistance, and aging resistance of the rubber, and the cost of precipitated silica is relatively low. In this specific embodiment, the silica used is RS150 type silica produced by Yangzhong Grass Company.

[0078] Furthermore, the melting point of paraffin wax is 56–58°C. The paraffin wax used in this specific embodiment is a semi-refined paraffin wax with a melting point of 56–58°C; either No. 56 or No. 58 semi-refined paraffin wax produced by commonly available manufacturers can be used.

[0079] Adding paraffin wax to rubber further enhances its durability because paraffin wax precipitates to the rubber surface below its melting point, forming a protective layer and thus improving its anti-aging effect.

[0080] Furthermore, the diameter of the single-walled carbon nanotubes is 11–15 nm, and the tube length is 16–20 μm.

[0081] Furthermore, the diameter of the aforementioned single-walled carbon nanotubes can also be selected from any of the following numerical ranges: 11–15 nm, 11–12.5 nm, and 12.5–15 nm.

[0082] Furthermore, the tube length of the aforementioned single-walled carbon nanotubes can also be selected from any of the following numerical ranges: 16–20 μm, 16–18 μm, 18–20 μm.

[0083] Single-walled carbon nanotubes can improve electrical conductivity and are insensitive to environmental and time factors, maintaining their conductivity over a long period. Simultaneously, single-walled carbon nanotubes also endow rubber with excellent physical and mechanical properties, high elasticity, and low compression set, meeting the requirements for suitable damping and volume resistivity in this rubber formulation.

[0084] Furthermore, the rubber was tested according to the method in GB / T 2439, and its volume resistivity was 1.1 × 10⁻⁶. 5 ~2×10 7 Ω·cm.

[0085] The rubber of this invention possesses excellent weather resistance and ozone resistance, resulting in a long product service life. This rubber is a specific formulation that meets the requirements of the T / CEC (China Electricity Council) standard "Technical Conditions and Test Methods for Rubber and Rubber Products in Power Fittings," drafted under the leadership of the China Electric Power Research Institute. Since this standard has only recently been implemented, there is generally no rubber formulation in the industry that meets its performance requirements. The publication of this patent can serve as a reference for the industry, stimulating further research and contributing to the industry's overall development.

[0086] Compared to Chinese Patent (II) CN113831652 A mentioned in the background of this invention, the rubber in its embodiments was tested for volume resistivity according to GB / T1692-2008. Although the volume resistivity of the rubber in some embodiments falls within the range specified by the T / CEC447-2021 standard, it is worth noting that the test standard for volume resistivity in this invention is GB / T2439. After testing, it was found that the sample shape and size in GB / T1692-2008 and GB / T 2439 are not the same. The resistivity of the rubber measured by the two methods is different. Therefore, the resistivity of the product in Chinese Patent (II) CN113831652 A may not actually meet the T / CEC 447-2021 standard. Other parameters are not mentioned, making it even more difficult to guarantee. Moreover, the application uses a large amount of single-walled carbon nanotubes. Since the unit price of single-walled carbon nanotubes is relatively expensive, the economic efficiency of this patent is also poor.

[0087] Secondly, the present invention provides a method for preparing the aforementioned rubber, comprising the following steps:

[0088] S1. Internal mixing: Jilin Chemical EPDM and Mitsui EPDM are added and mixed in an internal mixer, then single-walled carbon nanotubes, zinc oxide and stearic acid are added and mixed, then carbon black, silica, paraffin and naphthenic oil are added and mixed, and finally the masterbatch is obtained by lifting the plug and discharging the rubber.

[0089] S2. Open mill vulcanization: The masterbatch obtained from step S1. de-gumming is wrapped on the rollers of the open mill, and compounding agents are added: 40% of dicumyl peroxide, tetramethylthiuram disulfide, 80% of sulfur and silane coupling agent. After all the compounding agents are absorbed into the masterbatch, the mill is turned over and finally sheeted to obtain the compound.

[0090] S3. Molding: The compound obtained in step S3. is formed into a blank of standard weight and shape;

[0091] S4. Vulcanization: The preform formed in step S4 is filled into the mold cavity and vulcanized to obtain rubber.

[0092] Furthermore, in step S1, the mixing time for adding Jilin Chemical EPDM and Mitsui EPDM is 45-55 seconds.

[0093] Furthermore, in step S1, the mixing time for adding single-walled carbon nanotubes, zinc oxide, and stearic acid is 10-20 seconds.

[0094] Furthermore, in step S1, the mixing time for adding carbon black, silica, paraffin wax, and naphthenic oil is 100-120 seconds.

[0095] Furthermore, in step S1, the time for lifting the thrombus is 10 to 20 seconds.

[0096] Furthermore, in step S1, the glue discharge temperature is 110-120℃.

[0097] Furthermore, in step S2, the turning operation method adopts one or more of the following: triangular wrapping method, rolling method, oblique cutting method, and thin-passing method.

[0098] Furthermore, in step S2, the refining operation method is to make five triangular bundles and three rolls of rubber compound.

[0099] Furthermore, in step S3, the compound is extruded and cut using a high-pressure preforming device to obtain a preform of standard weight and shape.

[0100] Furthermore, in step S4, the vulcanization process is carried out at a vulcanization temperature of 160–180°C, a vulcanization pressure of 15–20 MPa, and a vulcanization time of 15–20 min.

[0101] Thirdly, this invention provides an application of rubber, wherein the rubber is the aforementioned rubber or rubber prepared by the aforementioned rubber preparation method; the rubber is applied to rubber damping shock absorbers for ultra-high voltage power transmission. Considering that rubber at high altitudes will be exposed to extreme heat, extreme cold, ozone aging, and compression heat generated by conductor galloping, the ozone resistance, cold resistance, compression resistance, and suitable resistivity of the rubber formulation are all challenging. This invention provides a rubber whose performance in all aspects meets the requirements of rubber damping shock absorbers for ultra-high voltage power transmission. Specific Implementation

[0103] To further understand the content of this invention, the invention will be further described below with reference to specific embodiments.

[0104] The weight parts of each raw material component of the rubber in specific embodiments 1 to 4 are shown in Table 1.

[0105] Table 1. Weight parts of each raw material component of rubber in Examples 1-4

[0106]

[0107] The preparation methods of the rubber in specific embodiments 1 to 4 are as follows:

[0108] S1. Internal mixing: Add Jilin Chemical EPDM and Mitsui EPDM to the internal mixer and mix for 50 seconds. Then add single-walled carbon nanotubes, zinc oxide and stearic acid and mix for 15 seconds. Then add carbon black, silica, paraffin wax and naphthenic oil and mix for 110 seconds. Finally, perform a throttle lifting for 15 seconds and control the mixing temperature to reach 115℃ to discharge the rubber and obtain the masterbatch.

[0109] S2. Open mill vulcanization: The masterbatch obtained from step S1. de-gumming is wrapped on the rollers of the open mill, and compounding agents are added: 40% of dicumyl peroxide, tetramethylthiuram disulfide, 80% of sulfur and silane coupling agent. After all the compounding agents are absorbed into the compound, the mill is turned over. Finally, the rubber compound is sheeted out after being wrapped in five triangular bundles and three rolls.

[0110] S3. Molding: The compound obtained in step S2 is formed into a preform of standard weight and shape; specifically, the compound is extruded and cut by a high-pressure preforming device to obtain a preform of standard weight and shape.

[0111] S4. Vulcanization: The preform formed in step S3 is filled into the mold cavity and vulcanized to obtain rubber. The vulcanization parameters are as follows: vulcanization temperature is 170℃, vulcanization pressure is 17 MPa, and vulcanization time is 17 min.

[0112] The properties of the rubber in the above specific embodiments 1 to 4 were tested, wherein:

[0113] Hardness, tensile strength, elongation at break, 300% tensile strength, tear strength, volume resistivity, ozone aging resistance, brittle temperature, low-temperature hardness, and TR tests were performed using standard specimens of 150*120*2mm prepared with a vulcanization temperature of 170℃, a vulcanization pressure of 18MPa, and a vulcanization time of 15min.

[0114] Short-time compression set, compression set, resilience, low-temperature compression set, and low-temperature resilience were tested using cylindrical specimens with a diameter of 29 mm and a height of 12.5 mm, prepared at a vulcanization temperature of 175℃, a vulcanization pressure of 18 MPa, and a vulcanization time of 20 min.

[0115] The compression cold resistance coefficient was tested using a cylindrical specimen with a diameter of 10 mm and a height of 10 mm, prepared at a vulcanization temperature of 170℃, a vulcanization pressure of 18 MPa, and a vulcanization time of 20 min.

[0116] Akron wear-resistant rubber wheels with a diameter of 68 mm and a thickness of 12.7 mm are manufactured using a vulcanization temperature of 175℃, a vulcanization pressure of 18 MPa, and a vulcanization time of 20 min.

[0117] The peel bond strength between the rubber and the skeleton was determined by preparing a peel test specimen with a length of 125 mm and a width of 25 mm using a vulcanization temperature of 175℃, a vulcanization pressure of 18 MPa, and a vulcanization time of 20 min.

[0118] It should be noted that the vulcanization steps and corresponding vulcanization temperatures, pressures and times in the above-mentioned rubber testing process refer to the vulcanization of the finished rubber product after vulcanization in step S4. This is to meet the testing requirements and is different from the vulcanization in step S4.

[0119] After testing, the specific embodiments 1 to 4 above meet the performance requirements of the T / CEC China Electricity Council standard "Technical Conditions and Test Methods for Electric Fitting Rubber and Rubber Products" drafted under the leadership of China Electric Power Research Institute. The specific test results are shown in Table 2.

[0120] Table 2. Rubber performance test results of Examples 1-4

[0121]

[0122]

[0123] Comparative Example 1

[0124] The only difference from Example 1 is that the single-walled carbon nanotubes were replaced with highly abrasion-resistant carbon black. The rubber in Comparative Example 1 was tested using the same testing method as in Example 1, and its volume resistivity was measured to be 7.8 × 10⁻⁶. 7 Ω·cm, which does not meet the requirements of T / CEC 447-2021.

[0125] Comparative Example 2

[0126] The only difference from Example 2 is that the weight fraction of single-walled carbon nanotubes is 4. The rubber in Comparative Example 2 was tested using the same testing method as in Example 1, and its volume resistivity was measured to be 3.4 × 10⁻⁶. 4 Ω·cm, which does not meet the requirements of T / CEC 447-2021.

[0127] Comparative Example 3

[0128] The only difference from Example 3 is that the high-abrasion-resistant carbon black has a weight ratio of 28. The rubber in Comparative Example 3 was tested using the same test method as in Example 1, and its volume resistivity was measured to be 8.3 × 10⁻⁶. 7 Ω·cm, which does not meet the requirements of T / CEC 447-2021.

[0129] Comparative Example 4

[0130] The only difference from Example 4 is that the weight part of precipitated silica is 24, and the rubber in Comparative Example 4 was tested using the same test method as in Example 1, and its volume resistivity was measured to be 8.3 × 10⁻⁶. 4 Ω·cm, which does not meet the requirements of T / CEC447-2021.

[0131] Comparative Example 5

[0132] The only difference from Example 1 is that the weight parts of single-walled carbon nanotubes are 0, the weight parts of high abrasion-resistant carbon black are 50, and the weight parts of precipitated silica are 27. The rubber in Comparative Example 5 was tested using the same test method as in Example 1, and its hardness was measured to be 74 Shore A and its elongation at break was 340%, which does not meet the requirements of T / CEC 447-2021.

[0133] The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and variations can be made without departing from the scope of the invention as defined by the appended claims. The detailed description should be considered illustrative only and not restrictive, and any such modifications and variations shall fall within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the current state of development and significance of the technology and is not intended to limit the present invention or its application areas.

[0134] More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adaptive changes, and / or substitutions, as would be apparent to those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly as used in the language of the claims and are not limited to the examples described in the foregoing detailed description or during the implementation of this application, which should be considered non-exclusive. Any step listed in any method or process claim may be performed in any order and is not limited to the order set forth in the claims. Therefore, the scope of the invention should be determined solely by the appended claims and their legal equivalents, and not by the description and examples given above.

[0135] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of conflict, the definitions in this specification shall prevail. When bond strength, thickness, temperature, time, or other values ​​or parameters are expressed as ranges, preferred ranges, or a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether such range is disclosed individually. For example, the range 1-50 should be understood to include any number, combination of numbers, or subrange selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, as well as all decimal values ​​between the integers mentioned above, such as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. Regarding subranges, specifically consider "nested subranges" extending from any endpoint of the range. For example, nested sub-ranges of the exemplary range 1-50 may include 1-10, 1-20, 1-30 and 1-40 in one direction, or 50-40, 50-30, 50-20 and 50-10 in another direction.

Claims

1. A type of rubber, characterized in that, Based on parts by weight, it includes the following raw material components: 100 copies of EPDM; 5-10 parts zinc oxide; Stearic acid 0.5~1.5 parts; 7-8 parts of 40% dicumyl peroxide; the 40% dicumyl peroxide is a mixture of 40% dicumyl peroxide and 60% kaolin. 0.2-0.4 parts of tetramethylthiuram disulfide; 0.5-0.8 parts of 80% sulfur content; the 80% sulfur content is a mixture of sulfur and EPDM rubber; 35-40 parts carbon black; 25-27 parts of silica; 0.4-0.6 parts of silane coupling agent; 14-20 parts of naphthenic oil; Paraffin wax 0.6-1 part; 1-3 parts of single-walled carbon nanotubes; The weight of the EPDM shall not be less than 50% of the total weight of the rubber; The EPDM comprises Jilin Chemical EPDM and Mitsui EPDM, and the weight ratio of Mitsui EPDM to Jilin Chemical EPDM is 0.01~0.

5. The carbon black is a high abrasion-resistant carbon black.

2. The rubber according to claim 1, characterized in that, The silica mentioned is precipitated silica.

3. The rubber according to claim 1, characterized in that, The single-walled carbon nanotubes have a diameter of 11-15 nm and a length of 16-20 μm.

4. The rubber according to claim 1, characterized in that, The rubber was tested according to the method in GB / T 2439, and its volume resistivity was 1.1 × 10⁻⁶. 5 ~2×10 7 Ω·cm.

5. The method for preparing rubber according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Internal mixing: Add Jilin Chemical EPDM and Mitsui EPDM to the internal mixer and mix, then add single-walled carbon nanotubes, zinc oxide and stearic acid and mix, then add high abrasion-resistant carbon black, white carbon black, paraffin wax and naphthenic oil and mix, and finally perform plug lifting and rubber discharge to obtain masterbatch. S2. Open mill vulcanization: The masterbatch obtained from step S1. de-gumming is wrapped on the rollers of the open mill, and compounding agents are added: 40% of dicumyl peroxide, tetramethylthiuram disulfide, 80% of sulfur and silane coupling agent. After all the compounding agents are absorbed into the masterbatch, the mill is turned over and finally sheeted to obtain the compound. S3. Molding: The compound obtained in step S3. is formed into a preform of standard weight and shape; S4. Vulcanization: The preform formed in step S4 is filled into the mold cavity and vulcanized to obtain rubber.

6. The method for preparing rubber according to claim 5, characterized in that, In step S1, the glue discharge temperature is 110~120℃.

7. The method for preparing rubber according to claim 6, characterized in that, In step S4, the vulcanization process is carried out at a vulcanization temperature of 160-180°C, a vulcanization pressure of 15-20 MPa, and a vulcanization time of 15-20 min.

8. An application of rubber, characterized in that, The rubber is the rubber according to any one of claims 1-4 or the rubber prepared by the preparation method according to any one of claims 5-7; the rubber is used in rubber damping shock absorbers for ultra-high voltage power transmission.

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