150kV ultrahigh-voltage ethylene propylene rubber cable material as well as preparation method and application thereof

Abstract

The invention discloses a 150kV ultrahigh-voltage ethylene propylene rubber cable material as well as a preparation method and application thereof, and belongs to the technical field of cable insulating materials. According to the invention, specific ethylene propylene rubber is selected and cooperated with other components to obtain the 150kV ultrahigh-voltage ethylene propylene rubber cable material, and the cable material has good electrical performance and high-voltage resistance; meanwhile, after the methyl methacrylate-butadiene-styrene copolymer, the chlorotrifluoroethylene-ethylene copolymer and the acrylate copolymer are added into the 150kV ultrahigh-pressure ethylene propylene rubber cable material, the three copolymers have a synergistic effect, so that the rigidity, the toughness, the oil resistance, the acid and alkali resistance, the weather resistance, the mechanical property and the wear resistance of the 150kV ultrahigh-pressure ethylene propylene rubber cable material can be remarkably improved; active groups on the surface of the modified kaolin and other groups act, so that the mechanical property of the 150kV ultrahigh-voltage ethylene propylene rubber cable material is further improved; therefore, the ethylene propylene rubber cable material has a relatively good application prospect.

Description

Technical Field

[0001] This invention belongs to the technical field of cable insulation materials, specifically relating to a 150kV ultra-high voltage ethylene propylene rubber cable material, its preparation method, and its application. Background Technology

[0002] As is well known, ethylene propylene rubber (EPR) possesses excellent electrical properties, with very low dielectric constant and dielectric loss tangent. It also exhibits outstanding water resistance, corona resistance, mechanical properties, and aging resistance, making it one of the main insulation materials for high-voltage cables. With China's "dual-carbon" goals and the rapid development of new energy sources such as offshore wind power and pumped storage power stations, the demand for high-voltage and ultra-high-voltage (35kV, 66kV, 110kV, and even 150kV) EPR insulated power cable current collection systems has increased dramatically. The industry as a whole is gradually shifting towards deep-sea development because high-voltage transmission can effectively improve output efficiency, reduce current, and significantly reduce line losses and power loss in transmission cables. However, since high-voltage EPR insulation materials are primarily imported, the formulation technology is complex, and it is more prone to water treeing than cross-linked polyethylene, there are almost no domestic manufacturers developing this product, and no relevant standards or literature have been found.

[0003] In addition to the main material EPR, ethylene propylene rubber (EPR) cable compounds require other raw materials, such as fillers and reinforcing agents. Commonly used fillers and reinforcing agents include silica, carbon black, calcium carbonate, kaolin, and talc. Carbon black particles contain carbonyl, hydroxyl, and quinone groups on their surface. These groups can bond with the molecular chains in rubber molecules to form bonded rubber, significantly improving the mechanical strength and wear resistance of the rubber material. Furthermore, functional additives and plasticizers can be added to further enhance the material's performance.

[0004] However, there are currently no research reports on 150kV ultra-high voltage ethylene propylene rubber cable materials. Summary of the Invention

[0005] The purpose of this invention is to provide a 150kV ultra-high voltage ethylene propylene rubber cable material, its preparation method, and its application. This addresses the problem of the lack of 150kV ultra-high voltage ethylene propylene rubber cable materials in the existing technology.

[0006] In a first aspect, the present invention provides a 150kV ultra-high voltage ethylene propylene rubber cable material, comprising, by weight, the following components: 80-120 parts of ethylene propylene rubber, 30-40 parts of modified kaolin, 5-15 parts of methyl methacrylate-butadiene-styrene copolymer, 4-16 parts of trifluorochloroethylene-ethylene copolymer, 3-10 parts of acrylate copolymer, 3-12 parts of zinc oxide, 2-15 parts of antioxidant, 2-10 parts of Fischer-Tropsch wax, 0.5-5 parts of silane coupling agent, 0.1-0.3 parts of copper inhibitor, 0.5-5 parts of crosslinking agent, and 0.5-2 parts of crosslinking aid; wherein the ethylene content in the ethylene propylene rubber is 70-78%, and the content of the third monomer is 0.5-2.5%.

[0007] In this invention, the inventors discovered that by selecting specific ethylene propylene rubber and synergistically combining it with other components, a 150kV ultra-high voltage ethylene propylene rubber cable material was obtained. This cable material exhibits good electrical properties and high voltage resistance. Furthermore, by adding methyl methacrylate-butadiene-styrene copolymer, trichlorofluoroethylene-ethylene copolymer, and acrylate copolymer to the 150kV ultra-high voltage ethylene propylene rubber cable material, the synergistic effect of these three components significantly improves the performance of the 150kV ultra-high voltage ethylene propylene rubber cable material. Among these, the methyl methacrylate-butadiene-styrene copolymer exhibits good rigidity. It exhibits good toughness, oil and acid / alkali resistance; trifluorochloroethylene-ethylene copolymer has good strength and corrosion resistance, and acrylate copolymer, as a compatibilizer, can crosslink methyl methacrylate-butadiene-styrene copolymer and trifluorochloroethylene-ethylene copolymer, thereby improving the weather resistance and mechanical properties of 150kV ultra-high voltage ethylene propylene rubber cable material; in addition, after the action of modified kaolin and silane coupling agent, the wear resistance of 150kV ultra-high voltage ethylene propylene rubber cable material can be improved, and the active groups on the surface of modified kaolin and other components further improve the mechanical properties of 150kV ultra-high voltage ethylene propylene rubber cable material.

[0008] In some implementation schemes, the preparation of modified kaolin includes: subjecting kaolin to acid treatment and low-temperature plasma treatment in sequence to obtain modified kaolin; wherein, the acid treatment step specifically includes: adding kaolin to an acid solution for soaking to obtain acid-treated kaolin; the mass ratio of kaolin to acid solution is 1:(6-8), the mass concentration of acid solution is 8-12%, and the acid solution includes at least one of sulfuric acid solution, nitric acid solution, and hydrochloric acid solution; the soaking time is 6-10 hours.

[0009] In some implementation schemes, the steps of sequentially acid-treating and low-temperature plasma-treating kaolin include: placing the acid-treated kaolin in a low-temperature plasma device, introducing gas, setting the power of glow discharge, evacuating the vacuum, and treating for 3-5 minutes to obtain modified kaolin.

[0010] In some embodiments, the gas includes at least one of oxygen, carbon dioxide, hydrogen, and methane, and the gas flow rate is 1-2 L / min; the power of the glow discharge is 100-150 W.

[0011] In some implementations, the antioxidant includes ethoxyquinoline, and the silane coupling agent includes at least one of vinyltriethoxysilane and vinyltrimethoxysilane.

[0012] In some implementations, the copper inhibitor includes zinc 2-mercaptobenzimidazole.

[0013] In some implementations, the crosslinking agent includes dicumyl peroxide, and the crosslinking aid includes triallyl cyanurate.

[0014] In a second aspect, the present invention provides a method for preparing 150kV ultra-high voltage ethylene propylene rubber cable material as described above, comprising the following steps: S1, providing a dust-free and clean production workshop; S2, in the production workshop, mixing ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, antioxidant, Fischer-Tropsch wax, and copper inhibitor, followed by a first mixing process, then adding a silane coupling agent and performing a second mixing process, and continuing to add a crosslinking agent and crosslinking aids and performing a third mixing process to obtain a mixture; placing the mixture in a twin-screw extruder for extrusion granulation to obtain 150kV ultra-high voltage ethylene propylene rubber cable material.

[0015] In some implementation schemes, in step S1, the cleanliness level of the dust-free production workshop is ISO 3-5; and / or, in step S2, the temperature of the first mixing is 125-155℃ and the time is 1-2 min; the temperature of the second mixing is 125-155℃ and the time is 3-4 min; the temperature of the third mixing is 90-100℃ and the time is 1-2.5 min; and the temperature of extrusion granulation is 80-100℃.

[0016] In a third aspect, the present invention provides the application of 150kV ultra-high voltage ethylene propylene rubber cable material prepared by any of the above-described methods or by any of the above-described preparation methods in offshore wind power and / or pumped storage power stations.

[0017] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention, by selecting specific ethylene propylene rubber and synergistically combining it with other components, yields a 150kV ultra-high voltage ethylene propylene rubber cable material. This cable material exhibits good electrical properties and high voltage resistance. Furthermore, by adding methyl methacrylate-butadiene-styrene copolymer, trichlorofluoroethylene-ethylene copolymer, and acrylate copolymer to the 150kV ultra-high voltage ethylene propylene rubber cable material, the synergistic effect of these three components significantly improves the performance of the 150kV ultra-high voltage ethylene propylene rubber cable material. Among these, the methyl methacrylate-butadiene-styrene copolymer possesses… It exhibits good rigidity and toughness, and is resistant to oil, acids, and alkalis. The trifluorochloroethylene-ethylene copolymer possesses good strength and corrosion resistance, and the acrylate copolymer, acting as a compatibilizer, enables the crosslinking of methyl methacrylate-butadiene-styrene copolymer and trifluorochloroethylene-ethylene copolymer, thereby improving the weather resistance and mechanical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material. In addition, the modified kaolin and silane coupling agent improve the wear resistance of the 150kV ultra-high voltage ethylene propylene rubber cable material, and the active groups on the modified kaolin surface, along with other components, further enhance the mechanical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material in this invention. Figure 2 The image shows the FTIR test results of the 150kV ultra-high voltage ethylene propylene rubber cable material prepared in Example 1 of this invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Experimental methods not specified in the examples are generally performed under conventional conditions and as described in the manual, or as recommended by the manufacturer. Unless otherwise specified, the general equipment, materials, reagents, etc. used are commercially available.

[0021] Currently, there is a lack of 150kV ultra-high voltage ethylene propylene rubber cable materials in existing technologies.

[0022] To address the lack of 150kV ultra-high voltage ethylene propylene rubber cable material in existing technologies, this invention provides a 150kV ultra-high voltage ethylene propylene rubber cable material, its preparation method, and its application.

[0023] In a first aspect, the present invention provides a 150kV ultra-high voltage ethylene propylene rubber cable material, comprising, by weight, the following components: 80-120 parts of ethylene propylene rubber, 30-40 parts of modified kaolin, 5-15 parts of methyl methacrylate-butadiene-styrene copolymer, 4-16 parts of trifluorochloroethylene-ethylene copolymer, 3-10 parts of acrylate copolymer, 3-12 parts of zinc oxide, 2-15 parts of antioxidant, 2-10 parts of Fischer-Tropsch wax, 0.5-5 parts of silane coupling agent, 0.1-0.3 parts of copper inhibitor, 0.5-5 parts of crosslinking agent, and 0.5-2 parts of crosslinking aid; wherein the ethylene content in the ethylene propylene rubber is 70-78%, and the content of the third monomer is 0.5-2.5%.

[0024] The 150kV ultra-high voltage ethylene propylene rubber cable material provided by this invention, through the selection of specific ethylene propylene rubber and its synergistic combination with other components, yields a 150kV ultra-high voltage ethylene propylene rubber cable material with good electrical properties and high voltage resistance. Furthermore, by adding methyl methacrylate-butadiene-styrene copolymer, trichlorofluoroethylene-ethylene copolymer, and acrylate copolymer to the 150kV ultra-high voltage ethylene propylene rubber cable material, the synergistic effect of these three components significantly improves the performance of the 150kV ultra-high voltage ethylene propylene rubber cable material. Among these, the methyl methacrylate-butadiene-styrene copolymer exhibits superior performance. It exhibits good rigidity and toughness, and is resistant to oil, acids, and alkalis. The trifluorochloroethylene-ethylene copolymer possesses good strength and corrosion resistance, and the acrylate copolymer, acting as a compatibilizer, enables the crosslinking of methyl methacrylate-butadiene-styrene copolymer and trifluorochloroethylene-ethylene copolymer, thereby improving the weather resistance and mechanical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material. In addition, the modified kaolin and silane coupling agent improve the wear resistance of the 150kV ultra-high voltage ethylene propylene rubber cable material, and the active groups on the surface of the modified kaolin, along with other components, further enhance the mechanical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0025] In some embodiments, the preparation of modified kaolin includes: subjecting kaolin to acid treatment and low-temperature plasma treatment sequentially to obtain modified kaolin; wherein, the acid treatment step specifically includes: soaking kaolin in an acid solution to obtain acid-treated kaolin; the mass ratio of kaolin to acid solution is 1:(6-8), preferably 1:7; the mass concentration of acid solution is 8-12%, preferably 10%; and the acid solution includes at least one of sulfuric acid solution, nitric acid solution, and hydrochloric acid solution; the soaking time is 6-10 hours, preferably 8 hours.

[0026] In this invention, by modifying kaolin, the specific surface area of ​​kaolin can be increased, and the surface of kaolin can contain active groups such as hydroxyl and carboxyl groups, which facilitates reaction with other components, thereby improving the wear resistance and mechanical properties of 150kV ultra-high voltage ethylene propylene rubber cable material.

[0027] In some implementation schemes, in the steps of sequentially acid-treating and low-temperature plasma-treating kaolin, the low-temperature plasma-treating specifically includes: placing the acid-treated kaolin in a low-temperature plasma device, introducing gas, setting the power of glow discharge, evacuating the vacuum, and treating for 3-5 minutes, preferably 4 minutes; to obtain modified kaolin.

[0028] In some embodiments, the gas includes at least one of oxygen, carbon dioxide, hydrogen, and methane, and the gas flow rate is 1-2 L / min, preferably 1.5 L / min; the power of the glow discharge is 100-150 W, preferably 125 W.

[0029] In this invention, by controlling the parameters of low-temperature plasma treatment within a specific range, complete modification can be achieved, resulting in modified kaolin with significantly improved performance.

[0030] In some implementations, the antioxidant includes ethoxyquinoline, and the silane coupling agent includes at least one of vinyltriethoxysilane and vinyltrimethoxysilane.

[0031] In this invention, by adding an anti-aging agent, the anti-aging performance of 150kV ultra-high voltage ethylene propylene rubber cable material can be significantly improved.

[0032] In some implementations, the copper inhibitor includes zinc 2-mercaptobenzimidazole.

[0033] In this invention, the addition of a copper-resistant agent can delay the thermo-oxidative aging process of 150kV ultra-high voltage ethylene propylene rubber cable material, thereby further improving the anti-aging performance of the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0034] In some implementations, the crosslinking agent includes dicumyl peroxide, and the crosslinking aid includes triallyl cyanurate.

[0035] In this invention, by adding a crosslinking agent and a crosslinking aid, the 150kV ultra-high voltage ethylene propylene rubber cable material can be crosslinked, thereby significantly improving the performance of the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0036] In a second aspect, the present invention provides a method for preparing 150kV ultra-high voltage ethylene propylene rubber cable material as described above, comprising the following steps: S1, providing a dust-free and clean production workshop; S2, in the production workshop, mixing ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, antioxidant, Fischer-Tropsch wax, and copper inhibitor, followed by a first mixing process, then adding a silane coupling agent and performing a second mixing process, and continuing to add a crosslinking agent and crosslinking aids and performing a third mixing process to obtain a mixture; placing the mixture in a twin-screw extruder for extrusion granulation to obtain 150kV ultra-high voltage ethylene propylene rubber cable material.

[0037] The preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material provided by this invention is simple, the raw materials used are cheap and readily available, and it is convenient for large-scale industrial production and application. At the same time, by selecting a dust-free and clean production workshop and using a specific production formula, the 150kV ultra-high voltage ethylene propylene rubber cable material is finally obtained. This 150kV ultra-high voltage ethylene propylene rubber cable material has good electrical properties and high voltage resistance.

[0038] In some implementations, in step S1, the cleanliness level of the dust-free production workshop is ISO 3-5; and / or, in step S2, the temperature of the first mixing is 125-155°C, preferably 140°C; the time is 1-2 min, preferably 1.5 min; the temperature of the second mixing is 125-155°C, preferably 140°C; the time is 3-4 min, preferably 3.5 min; the temperature of the third mixing is 90-100°C, preferably 95°C; the time is 1-2.5 min, preferably 2 min; and the temperature of extrusion granulation is 80-100°C, preferably 90°C.

[0039] In this invention, by controlling the cleanliness level of the dust-free production workshop within a specific range, the prepared 150kV ultra-high voltage ethylene propylene rubber cable material can possess better electrical properties. If the cleanliness level is outside this range, the electrical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material will be significantly reduced. Furthermore, by controlling the parameters of the first mixing, second mixing, third mixing, and extrusion granulation within a specific range, a 150kV ultra-high voltage ethylene propylene rubber cable material with better performance can be prepared.

[0040] In a third aspect, the present invention provides the application of 150kV ultra-high voltage ethylene propylene rubber cable material prepared by any of the above-described methods or by any of the above-described preparation methods in offshore wind power and / or pumped storage power stations.

[0041] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] Please see Figure 1 This is a flowchart illustrating the preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material of the present invention. Specifically, the preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material includes the following steps: S1, providing a dust-free and clean production workshop; S2, in the production workshop, mixing ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, antioxidant, Fischer-Tropsch wax, silane coupling agent, and copper inhibitor, followed by a first mixing, then adding a silane coupling agent and performing a second mixing, and continuing to add a crosslinking agent and crosslinking aid for a third mixing to obtain a mixture; the mixture is then placed in a twin-screw extruder for extrusion granulation to obtain the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0043] In this invention, the preparation of modified kaolin includes: mixing kaolin with nitric acid solution (mass concentration of 10%) at a mass ratio of 1:7 and soaking for 8 hours to obtain acid-treated kaolin; placing the acid-treated kaolin in a low-temperature plasma device, introducing a mixed gas of oxygen and hydrogen (volume ratio of 2:1) at a flow rate of 1.5 L / min; setting the glow discharge power to 120 W, evacuating the vacuum, and treating for 4 minutes to obtain modified kaolin.

[0044] Example 1 A 150kV ultra-high voltage ethylene propylene rubber cable material, by weight, comprises the following components: 100 parts ethylene propylene rubber, 35 parts modified kaolin, 10 parts methyl methacrylate-butadiene-styrene copolymer, 10 parts trifluorochloroethylene-ethylene copolymer, 7 parts acrylate copolymer, 8 parts zinc oxide, 9 parts ethoxyquinoline, 7 parts Fischer-Tropsch wax, 3 parts vinyltriethoxysilane, 0.2 parts 2-mercaptobenzimidazole zinc salt, 3 parts dicumyl peroxide, and 1.5 parts triallyl cyanurate; The ethylene content in the ethylene-propylene rubber is 74%, and the content of the third monomer is 1.5%.

[0045] The preparation method of this 150kV ultra-high voltage ethylene propylene rubber cable material includes the following steps: S1. Provide a cleanroom production facility (cleanliness level ISO 3). S2. In the production workshop of step S1, ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, ethoxyquinoline, Fischer-Tropsch wax, and 2-mercaptobenzimidazole zinc salt are mixed and kneaded at 135°C for 1.5 min. Then, vinyltriethoxysilane is added and kneaded at 135°C for another 1.5 min. Diisopropylbenzene peroxide and triallyl cyanurate are added and kneaded at 95°C for 2 min to obtain a mixture. The mixture is placed in a twin-screw extruder, and the die head temperature is controlled at 90°C. After extrusion granulation, 150kV ultra-high voltage ethylene propylene rubber cable material is obtained.

[0046] Example 2 A 150kV ultra-high voltage ethylene propylene rubber cable material, by weight, comprises the following components: 80 parts ethylene propylene rubber, 30 parts modified kaolin, 15 parts methyl methacrylate-butadiene-styrene copolymer, 16 parts trifluorochloroethylene-ethylene copolymer, 10 parts acrylate copolymer, 3 parts zinc oxide, 2 parts ethoxyquinoline, 2 parts Fischer-Tropsch wax, 0.5 parts vinyltriethoxysilane, 0.1 parts 2-mercaptobenzimidazole zinc salt, 0.5 parts dicumyl peroxide, and 0.5 parts triallyl cyanurate; The ethylene content in the ethylene-propylene rubber is 70%, and the content of the third monomer is 0.5%.

[0047] The preparation method of this 150kV ultra-high voltage ethylene propylene rubber cable material includes the following steps: S1. Provide a cleanroom production facility (cleanliness level ISO 4). S2. In the production workshop of step S1, ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, ethoxyquinoline, Fischer-Tropsch wax, and 2-mercaptobenzimidazole zinc salt are mixed and kneaded at 125°C for 2 minutes. Then, vinyltriethoxysilane is added and kneaded at 125°C for another 2 minutes. Diisopropylbenzene peroxide and triallyl cyanurate are added and kneaded at 90°C for 2.5 minutes to obtain a mixture. The mixture is placed in a twin-screw extruder, and the die head temperature is controlled at 80°C. After extrusion granulation, 150kV ultra-high voltage ethylene propylene rubber cable material is obtained.

[0048] Example 3 A 150kV ultra-high voltage ethylene propylene rubber cable material, by weight, comprises the following components: 120 parts ethylene propylene rubber, 40 parts modified kaolin, 5 parts methyl methacrylate-butadiene-styrene copolymer, 4 parts trifluorochloroethylene-ethylene copolymer, 3 parts acrylate copolymer, 12 parts zinc oxide, 15 parts ethoxyquinoline, 10 parts Fischer-Tropsch wax, 5 parts vinyltriethoxysilane, 0.3 parts 2-mercaptobenzimidazole zinc salt, 5 parts dicumyl peroxide, and 2 parts triallyl cyanurate. The ethylene content in the ethylene-propylene rubber is 78%, and the content of the third monomer is 2.5%.

[0049] The preparation method of this 150kV ultra-high voltage ethylene propylene rubber cable material includes the following steps: S1. Provide a cleanroom production facility (cleanliness level ISO 5). S2. In the production workshop of step S1, ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, ethoxyquinoline, Fischer-Tropsch wax, and 2-mercaptobenzimidazole zinc salt are mixed and kneaded at 155°C for 1 min. Then, vinyltriethoxysilane is added and kneaded at 155°C for 1 min. Diisopropylbenzene peroxide and triallyl cyanurate are added and kneaded at 100°C for 1 min to obtain a mixture. The mixture is placed in a twin-screw extruder, and the die head temperature is controlled at 100°C. After extrusion granulation, 150kV ultra-high voltage ethylene propylene rubber cable material is obtained.

[0050] Comparative Example 1 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that the ethylene content in the ethylene propylene rubber is 60%.

[0051] Comparative Example 2 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that the ethylene content in the ethylene propylene rubber is 85%.

[0052] Comparative Example 3 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that the cleanliness level of the dust-free production workshop is ISO 9.

[0053] Comparative Example 4 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that the 150kV ultra-high voltage ethylene propylene rubber cable material is prepared in a normal production workshop.

[0054] Comparative Example 5 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that methyl methacrylate-butadiene-styrene copolymer is not added.

[0055] Comparative Example 6 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1. The difference is that trifluorochloroethylene-ethylene copolymer is not added.

[0056] Comparative Example 7 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1, except that no acrylate copolymer is added.

[0057] Comparative Example 8 In this comparative example, the composition and preparation method of the 150kV ultra-high voltage ethylene propylene rubber cable material are basically the same as those in Example 1, except that modified kaolin is not added.

[0058] Performance testing For example, the 150kV ultra-high voltage ethylene propylene rubber cable material prepared in Example 1 was subjected to FTIR testing, and the results are as follows: Figure 2 As shown.

[0059] from Figure 2 It can be seen from this that the 150kV ultra-high voltage ethylene propylene rubber cable material contains ethylene propylene rubber (2800-3000cm). -1 (The left and right sides show obvious stretching vibration peaks of CH bonds) and modified kaolin (1022 cm⁻¹) -1 (The Si-O-Si stretching vibration peaks appear on the left and right sides); the above results indicate that the 150kV ultra-high voltage ethylene propylene rubber cable material has been successfully synthesized.

[0060] For example, the 150kV ultra-high voltage ethylene propylene rubber cable material prepared in Example 1 was subjected to air chamber thermal aging test (150℃, 168h), air spring aging test (127℃, 40h), thermal elongation test (250℃, 0.2MPa, 15min), ozone resistance test (25℃, 30h, concentration 0.025%~0.030%), and dielectric strength test. The results are shown in Table 1 below.

[0061] Table 1 Performance Test Results

[0062] As can be seen from Table 1, the 150kV ultra-high voltage ethylene propylene rubber cable material prepared in Example 1 of the present invention has good performance. Therefore, the 150kV ultra-high voltage ethylene propylene rubber cable material has good application prospects.

[0063] Furthermore, the volume resistivity of the 150kV ultra-high voltage ethylene propylene rubber cable materials prepared in Examples 1-3 and Comparative Examples 1-4 was tested, and the results are shown in Table 2 below.

[0064] Table 2. Volume resistivity test results

[0065] As shown in Table 2, the 150kV ultra-high voltage ethylene propylene rubber cable materials prepared in Examples 1-3 exhibit good electrical properties. In Comparative Examples 1 and 2, when the ethylene content in the ethylene propylene rubber was too low or too high, the volume resistivity of the prepared 150kV ultra-high voltage ethylene propylene rubber cable materials decreased significantly. In Comparative Example 3, the 150kV ultra-high voltage ethylene propylene rubber cable materials were prepared in a production workshop with an ISO 9 cleanliness level, and the volume resistivity of the prepared 150kV ultra-high voltage ethylene propylene rubber cable materials decreased significantly. In Comparative Example 4, the 150kV ultra-high voltage ethylene propylene rubber cable materials were prepared in a general production workshop, and the volume resistivity of the prepared 150kV ultra-high voltage ethylene propylene rubber cable materials decreased significantly. The results indicate that controlling the ethylene content in the ethylene propylene rubber within a specific range and preparing the material in a cleanroom with a specific cleanliness level can significantly improve the volume resistivity, thereby giving the 150kV ultra-high voltage ethylene propylene rubber cable material high-voltage resistance.

[0066] Furthermore, the tensile strength, elongation at break, acid and alkali resistance, oil resistance, and abrasion resistance of the 150kV ultra-high voltage ethylene propylene rubber cable materials prepared in Examples 1-3 and Comparative Examples 5-8 were tested, and the results are shown in Table 3 below.

[0067] The acid and alkali resistance and oil resistance tests are as follows: First, the tensile strength of the 150kV ultra-high voltage ethylene propylene rubber cable material prepared in Examples 1-3 and Comparative Examples 5-8 is measured as the initial tensile strength. Then, the material is immersed in 20% hydrochloric acid solution, 20% potassium hydroxide solution, and machine oil for 20 hours respectively. After that, the material is taken out and the tensile strength is tested again as the tensile strength after the test. The retention rate of tensile strength after treatment is calculated.

[0068] Abrasion resistance was tested using an Akron abrasion tester (WML-0333, Taiste Instruments Co., Ltd.).

[0069] Table 3. Results of tensile strength and elongation at break tests

[0070] As can be seen from the data in Table 3, the 150kV ultra-high voltage ethylene propylene rubber cable materials prepared in Examples 1-3 have good tensile strength, elongation at break, acid and alkali resistance, oil resistance, and abrasion resistance. Comparative Example 5 (without methyl methacrylate-butadiene-styrene copolymer), Comparative Example 6 (without trifluorochloroethylene-ethylene copolymer), and Comparative Example 7 (without acrylate copolymer) showed a decrease in the tensile strength, elongation at break, acid and alkali resistance, and oil resistance of the prepared 150kV ultra-high voltage ethylene propylene rubber cable materials. The results indicate that the synergistic effect of methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, and acrylate copolymer can improve the performance of the 150kV ultra-high voltage ethylene propylene rubber cable materials. In Comparative Example 8, without the addition of modified kaolin, it was found that the tensile strength and elongation at break of the prepared 150kV ultra-high voltage ethylene propylene rubber cable material decreased to a certain extent, and the wear resistance was significantly reduced. The results indicate that modified kaolin can not only increase the wear resistance of the material, but also further improve the performance of the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0071] In summary, this invention, by selecting specific ethylene propylene rubber and synergistically combining it with other components, yields a 150kV ultra-high voltage ethylene propylene rubber cable material. This cable material exhibits good electrical properties and high voltage resistance. Furthermore, by adding methyl methacrylate-butadiene-styrene copolymer, trichlorofluoroethylene-ethylene copolymer, and acrylate copolymer to the 150kV ultra-high voltage ethylene propylene rubber cable material, the synergistic effect of these three components significantly improves the rigidity, toughness, oil and acid / alkali resistance, weather resistance, mechanical properties, and abrasion resistance of the 150kV ultra-high voltage ethylene propylene rubber cable material. Moreover, the modification of the active groups on the kaolin surface and the interaction with other components further enhance the mechanical properties of the 150kV ultra-high voltage ethylene propylene rubber cable material.

[0072] It should be noted that all the above embodiments belong to the same inventive concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0073] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A 150kV ultra-high voltage ethylene propylene rubber cable material, characterized in that, By weight, it comprises the following components: 80-120 parts ethylene propylene rubber, 30-40 parts modified kaolin, 5-15 parts methyl methacrylate-butadiene-styrene copolymer, 4-16 parts trifluorochloroethylene-ethylene copolymer, 3-10 parts acrylate copolymer, 3-12 parts zinc oxide, 2-15 parts antioxidant, 2-10 parts Fischer-Tropsch wax, 0.5-5 parts silane coupling agent, 0.1-0.3 parts copper inhibitor, 0.5-5 parts crosslinking agent, and 0.5-2 parts crosslinking aid; The ethylene content in the ethylene-propylene rubber is 70-78%, and the content of the third monomer is 0.5-2.5%.

2. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 1, characterized in that, The preparation of the modified kaolin includes: subjecting kaolin to acid treatment and low-temperature plasma treatment in sequence to obtain the modified kaolin; The acid treatment step specifically includes: adding the kaolin to an acid solution for soaking to obtain acid-treated kaolin; the mass ratio of the kaolin to the acid solution is 1:(6-8), the mass concentration of the acid solution is 8-12%, and the acid solution includes at least one of sulfuric acid solution, nitric acid solution, and hydrochloric acid solution; the soaking time is 6-10 hours.

3. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 2, characterized in that, In the step of sequentially acid-treating and low-temperature plasma-treating kaolin, the low-temperature plasma-treating specifically includes: placing the acid-treated kaolin in a low-temperature plasma device, introducing gas, setting the power of glow discharge, evacuating the vacuum, and treating for 3-5 minutes to obtain modified kaolin.

4. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 3, characterized in that, The gas includes at least one of oxygen, carbon dioxide, hydrogen, and methane, and the gas flow rate is 1-2 L / min; the power of the glow discharge is 100-150 W.

5. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 1, characterized in that, The antioxidant includes ethoxyquinoline, and the silane coupling agent includes at least one of vinyltriethoxysilane and vinyltrimethoxysilane.

6. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 1, characterized in that, The copper-resistant agent includes 2-mercaptobenzimidazole zinc salt.

7. The 150kV ultra-high voltage ethylene propylene rubber cable material according to claim 1, characterized in that, The crosslinking agent includes dicumyl peroxide, and the crosslinking aid includes triallyl cyanurate.

8. A method for preparing 150kV ultra-high voltage ethylene propylene rubber cable material as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Provide a dust-free and clean production workshop; S2. In the production workshop, ethylene propylene rubber, methyl methacrylate-butadiene-styrene copolymer, trifluorochloroethylene-ethylene copolymer, acrylate copolymer, modified kaolin, zinc oxide, antioxidant, Fischer-Tropsch wax, and copper inhibitor are mixed and then subjected to a first mixing process. Then, a silane coupling agent is added and subjected to a second mixing process. Finally, a crosslinking agent and crosslinking aid are added and subjected to a third mixing process to obtain a mixture. The mixture is then placed in a twin-screw extruder for extrusion granulation to obtain the 150kV ultra-high voltage ethylene propylene rubber cable material.

9. The preparation method according to claim 8, characterized in that, In step S1, the cleanliness level of the cleanroom production workshop is ISO 3-5; and / or, In step S2, the temperature of the first mixing is 125-155℃ and the time is 1-2 min; the temperature of the second mixing is 125-155℃ and the time is 3-4 min; the temperature of the third mixing is 90-100℃ and the time is 1-2.5 min; and the temperature of the extrusion granulation is 80-100℃.

10. The application of the 150kV ultra-high voltage ethylene propylene rubber cable material as described in any one of claims 1-7 or the 150kV ultra-high voltage ethylene propylene rubber cable material prepared by the preparation method as described in any one of claims 8-9 in offshore wind power and / or pumped storage power stations.

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