Special silicone rubber for high-voltage cable of new energy automobile and preparation method of special silicone rubber

Abstract

The invention relates to special silicone rubber for a high-voltage cable of a new energy automobile and a preparation method of the special silicone rubber, the method comprises the following steps: raw material preparation: a basic silicone rubber component, a compatibility enhancing component, a flame retardant enhancer, an auxiliary crosslinking component and an antioxidant component are prepared, and the basic silicone rubber component comprises a silicone rubber component; and in the process of preparing the compatibility enhancing component, a compatibility enhancing component preparation step of pre-mixing the mica sheet and the linear high polymer material is included. According to the method and the prepared silicone rubber, the long thermal stretching retention rate and the long thermal fracture retention rate of a rubber composite material under high-temperature and high-pressure working conditions can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a material system of organic material and inorganic material and a preparation method, in particular, relates to a (special) silicone rubber for high-voltage cable of new energy vehicle and a preparation method thereof. BACKGROUND

[0002] With the development of new energy technologies, such as new energy vehicles, high-voltage high-temperature energy storage devices, etc., the application of power transmission is becoming more and more widespread. In more and more fields, wires and cables are required to work for a long time under high temperature, high humidity, and even certain high voltage conditions, which requires the wires and cables themselves to have good and durable mechanical and electrical properties.

[0003] The mechanical, electrical and mechanical properties of cable rubber have been widely studied. For example, Chinese patent publication CN116515229A relates to an insulating material for drag chain cable and a preparation method of insulating core for drag chain cable. In this technical document, the insulating particles are extruded outside the conductor by an extrusion device to form an insulating skin layer, and then subjected to electron irradiation to obtain an insulating core, with an irradiation dose of 70-145 Kgy. The insulating core obtained by electron irradiation of the insulating skin layer has outstanding tear resistance, high strength mechanical properties, and excellent softness.

[0004] However, such documents do not consider and improve the durability and electrical properties of cables and rubbers in high-voltage, high-temperature, moisture-resistant environments in new energy application fields.

[0005] Therefore, there is still a need for research and development of rubber materials for high-voltage cables of new energy vehicles in the related art, and there is still room for improvement. SUMMARY

[0006] The present application aims to solve the problems in the related art. A composite material and a preparation method of a (special) silicone rubber for high-voltage cables of new energy vehicles are provided. On the premise of not significantly increasing the production cost of large-scale production, the durability of the cable used in the new energy field under high temperature, high pressure and long-term harsh working conditions is effectively improved. The material has good and durable mechanical properties and stable electrical properties.

[0007] According to a first aspect of the present invention, a method for preparing rubber (special silicone rubber) for high-voltage cables of new energy vehicles is provided. The method includes the following steps: a raw material preparation step: preparing raw materials comprising the following components, including a basic silicone rubber component (component A), a compatibility reinforcing component (component B), a flame retardant reinforcing agent (component C), an auxiliary crosslinking component (component D), and an antioxidant component (component E), wherein the basic silicone rubber component includes a methyl vinyl phenyl silicone rubber component; and wherein the preparation of the compatibility reinforcing component includes a compatibility reinforcing component preparation step of pre-mixing mica sheets with a linear polymer material; a preliminary granulation step: granulating a portion of the total planned mass of the basic silicone rubber component, the flame retardant reinforcing agent component, and the auxiliary crosslinking agent component in a kneader. The mixture is then pre-granulated in an extruder; the compatibility reinforcing component mixing step involves thoroughly mixing the pre-granulated and pre-mixed compatibility reinforcing components obtained in the compatibility reinforcing component preparation step to obtain a preliminary mixture; the internal mixing step involves mixing the preliminary mixture obtained in the above steps with the remaining portion of the total planned mass of the base silicone rubber component, flame retardant reinforcing agent component, and auxiliary crosslinking agent component, and then adding the planned mass fraction of antioxidant component, and internally mixing in an internal mixer to obtain an internally mixed mixture; the final granulation step involves feeding the obtained internally mixed mixture back into an extruder for extrusion to obtain special silicone rubber for high-voltage cables of new energy vehicles; and preferably, the linear polymer material is linear low-density polyethylene (LDPE).

[0008] In an optional scheme, the raw material preparation step specifically includes the following raw material components by weight: Basic silicone rubber component: including 30-70 parts by weight of methyl vinyl phenyl silicone rubber; 20-40 parts by weight of ethylene propylene diene monomer (EPDM) rubber; 5-20 parts by weight of fluororubber; 1-10 parts by weight of polyphenylene ether; 3-15 parts by weight of ethylene-methyl methacrylate copolymer (EMMA); 10-40 parts by weight of linear low-density polyethylene; 1-10 parts by weight of hydroxyl silicone oil; 1-5 parts by weight of paraffin mineral oil; Compatible reinforcing component: 2-10 parts by weight of maleic anhydride grafted-ethylene acrylate copolymer; 1-10 parts by weight of linear low-density polyethylene; 1-10 parts by weight of mica sheets; Flame retardant reinforcing agent: 5-20 parts by weight of alkyl phosphinate; 2-10 parts by weight of melamine polyphosphate; Auxiliary crosslinking component: 0.5-5 parts by weight of triallyl isocyanurate; 0.5-5 parts by weight of triallyl cyanurate; Antioxidant component: Antioxidant 1010. 0.5-2 parts by weight.

[0009] In the optional technical solution, each step of the method specifically includes the following processes: Compatible reinforcing component preparation step: Maleic anhydride grafted-ethylene acrylate copolymer, linear low-density polyethylene resin, and mica sheets in the compatible reinforcing component are thoroughly mixed in a mixer, maintaining an inert atmosphere and controlling the system temperature at 110℃ to 120℃. After continuous stirring, the mixture is allowed to stand at room temperature for later use; Preliminary granulation step: 40% to 60% of the planned total weight of the base silicone rubber component, 40% to 60% of the planned total weight of the flame retardant reinforcing agent component, and 40% to 60% of the planned total weight of the auxiliary crosslinking agent component are first kneaded in a kneader, and then preliminarily granulated on a twin-screw extruder to obtain preliminary particles; wherein the temperature of the die head of the twin-screw extruder is controlled between 140℃ and 150℃, and the die body temperature is controlled between 120℃ and 130℃; the main extruder speed is controlled between 150±10 RPM for preliminary granulation; Compatible Reinforcing component mixing step: The preliminary granules obtained in the above steps are mixed with the prepared compatible reinforcing components in a mixer. The mixing temperature is controlled at 120℃ to 130℃, and the mixing time is controlled at 5 to 10 minutes to obtain a preliminary mixture. Mixing step: The above preliminary mixture is mixed again with the remaining mass of the base silicone rubber component, flame retardant reinforcing agent component, and auxiliary crosslinking agent component in a mixing machine. The planned weight of antioxidant is added, and then the mixture is mixed in a mixer. The mixing temperature is controlled at 140℃ to 150℃, and the mixing time is controlled at 15 to 20 minutes to obtain a mixed mixture. Final granulation step: The mixed mixture obtained in the above steps is fed into a twin-screw extruder for extrusion granulation. In this step, the die head temperature is controlled between 110℃ and 120℃, and the die body temperature is controlled between 100℃ and 110℃ to obtain special silicone rubber for high-voltage cables of new energy vehicles.

[0010] In an optional approach, the special silicone rubber for high-voltage cables of new energy vehicles obtained in the final granulation step is bonded to conductive cables or wires through a melt extrusion coating process.

[0011] In the optional technical solution, the ratio between the weight parts of mica sheets and the weight parts of methyl vinyl phenyl silicone rubber is set between 1:8 and 1:25 in the raw material formulation.

[0012] In an optional embodiment, the average particle size (D50) of the mica sheet is between 200 mesh and 400 mesh.

[0013] In a second aspect, the present invention provides a rubber composite material, wherein the rubber material is prepared by any one of the methods described above.

[0014] According to the embodiments of the present invention, the inventors surprisingly discovered that by using industrially readily available linear low-density polyethylene resin to mix and pretreat with mica sheets that enhance fire resistance and insulation properties during rubber granulation, mixing, extrusion, and other processes, the mechanical properties of silicone rubber composite materials under high heat and high complexity conditions can be further effectively improved while maintaining the fire-resistant and insulating properties.

[0015] The technical solutions and advantages of the present invention will be explained and described in more detail below with reference to specific embodiments. It should be understood that the content presented in the specification and specific embodiments is only for the purpose of more clearly illustrating the technical solutions and advantages of the present invention, and does not constitute a limitation on the scope of protection of the present invention. Those skilled in the art can obtain various reasonable modifications based on the disclosure in the specification, and as long as they do not depart from the spirit of the present invention, all modified technical solutions should be understood to be included within the scope of protection of the present invention. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solutions of this disclosure and constitute a part of the specification. They are used together with the specific embodiments of this application to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0017] Figure 1 This is a schematic diagram of a mica sheet and a relatively short-chain olefin premixed and linked together in an embodiment of the present invention.

[0018] Figure 2 The image is a cross-sectional SEM image of the rubber material manufactured according to Example 1 after thermal testing.

[0019] Figure 3 The image is a cross-sectional SEM image of the rubber material manufactured according to Comparative Example 1 after thermal testing. Detailed Implementation

[0020] The invention is described in more detail below to aid in understanding. Before describing specific embodiments, it should be noted that those skilled in the art can select appropriate raw materials based on the teachings and guidance of this disclosure, conduct relevant tests using relevant testing equipment, and obtain corresponding results. For raw materials for which specific manufacturers or sources are not specified, those skilled in the art can select raw materials that meet the corresponding requirements as reaction starting materials based on the disclosure and needs of this specification. The reaction raw materials for the compounds in the process section are derived from the initial products synthesized in the preceding steps of this invention, which is also understandable based on this disclosure. Table 1 below lists the main raw materials used in this invention and their corresponding acquisition channels or origins. It should be noted that raw materials not specified in this invention are varieties of raw materials that can be obtained by those skilled in the art based on ordinary technical knowledge and existing market products. Table 1: Description of Main Raw Materials Used in this Invention It should be noted that percentages specified in the technical solutions, embodiments, and content of this invention are generally described in detail. Unless otherwise specified, concentrations or percentages refer to mass percentages (wt%) or corresponding parts by mass. Furthermore, this invention may use open-ended terms such as "comprising" or "including" to describe embodiments that may include the main components used. However, in preferred embodiments, the material may consist only of the components and coatings specified in this invention, without necessarily including any other components. For example, the rubber material may consist only of the components shown in the embodiments, without including other components. The testing experiments of this invention are not limited in scope. The experiments in the experimental examples and comparative examples described in this invention can be generally performed in accordance with various national or industry standards. General physical and electrical performance tests: GB / T 1033.1, GB / T 2411, GB / T 2411, GB / T 1408, UL94 (general fire resistance test); General tensile test / fracture test: tensile properties of rubber composites are tested according to GB / T1040-2008 standard; Long-term heat aging test: heat aging related properties of rubber composites are tested according to GB / T2951-2008 standard; Thermal elongation: related tests are performed according to GB / T 2951.21.2008.

[0021] Examples 1 to 4 describe a preparation process for (special) silicone rubber that can be used in high-voltage cables for new energy vehicles. The raw material formulations for each example are shown in the table below. In the raw material composition ratio, the "A" series represents the basic silicone rubber components, which typically include various specific compounds (or compounds) such as A1 to A7 in the table; the B series represents the compatibility reinforcing components, which can be divided into components such as B1 to B3; the C series components are flame retardant reinforcing agents (which can be C1, C2, etc.); the D component is an auxiliary crosslinking agent (which can be D1, D2, etc.); and the E component is an antioxidant (which can be E1, etc.). Table 2: Formulation of each silicone rubber and other components in the examples (Each component is calculated in parts by weight)

[0022] In a typical preparation process, the following steps are performed: Step 1) Preparation of the compatibility reinforcing component: The maleic anhydride grafted ethylene acrylate copolymer, linear low-density polyethylene resin, and mica sheets in the compatibility reinforcing component (component B) are thoroughly mixed in a mixer, maintaining an inert atmosphere (such as nitrogen), and the system temperature is controlled at 110°C to 120°C. The mixing is continued for 1-2 hours, and then allowed to stand at room temperature for later use; Step 2) Preliminary granulation step: 50% of the planned total weight of the basic silicone rubber component (component A), 50% of the planned total weight of the flame retardant reinforcing agent component (component C), and 50% of the planned total weight of the auxiliary crosslinking agent component (component D) in each embodiment are first kneaded in a kneader, and then granulated on a twin-screw extruder to obtain preliminary granules; wherein the temperature of the die head of the twin-screw extruder is controlled at 140°C to 150°C, and the body temperature is controlled at 120°C to 130°C; the main extruder speed is controlled at 150±10 RPM for preliminary granulation; Step 3) The preliminary granulation is mixed with the prepared compatible reinforcing component in a mixer. The mixing temperature is controlled at 120°C to 130°C and the mixing time is controlled at 5 to 10 minutes to obtain a preliminary mixture. Step 4) Final mixing step: The preliminary mixture obtained in step 3) is mixed again with the remaining 50% by weight of the base silicone rubber component (component A), flame retardant reinforcing agent component (component C), and auxiliary crosslinking agent component (component D) in a mixing machine. Antioxidant (component E) is added, and then the mixture is mixed again in a mixer. The mixing temperature is controlled at 140°C to 150°C and the mixing time is controlled at 15 to 20 minutes to obtain a mixed mixture. Step 5) The mixed mixture obtained in step 4) is fed into a twin-screw extruder for extrusion granulation. In this step, the die head temperature is controlled between 110°C and 120°C and the die body temperature is controlled between 100°C and 110°C to obtain the (special) silicone rubber composite material that can be used for high-voltage cables of new energy vehicles in the implementation plan.

[0023] If it is to be applied to high-voltage cables, the silicone rubber composite material can be melt-extruded and coated onto the conductive core of the cable according to the relevant coating process, so as to achieve the combination of silicone rubber composite material and cable or wire.

[0024] According to the embodiments of the present invention, the inventors surprisingly discovered that by using industrially readily available linear low-density polyethylene resin to mix and pretreat with mica sheets that enhance fire resistance and insulation properties during rubber granulation, mixing, extrusion and other processes, the fire-resistant and insulating properties can be maintained while further effectively improving the mechanical properties of silicone rubber composites under high heat and high stress conditions (such as tensile strength retention rate and elongation at break retention rate in heat aging tests).

[0025] Comparative Example 1 followed a similar process to Example 1 in Comparative Experiment 1. The difference was that in step 1), the linear low-density polyethylene resin was replaced with a polystyrene component containing a large number of benzene ring structures in the same weight proportions. The other process steps were the same as those in Example 1, using the same steps and components.

[0026] Comparative Example 2 follows a similar process to Example 1. The difference is that component B is not subjected to the pre-mixing and pre-forming steps of step 1). Instead, components B1, B2, and B3 are directly mixed with the preliminary granulation in step 2) during step 3). That is, step 1) of the example is not included in Comparative Example 2.

[0027] Comparative Example 3: In Comparative Experiment 3, a process similar to that of Example 1 was performed. The difference was that mica flakes were not used in component B, and the other process steps were simulated and followed the other steps of Example 1.

[0028] Based on the testing conditions of each project, the test results of the proposed implementation scheme and the comparative experiment are as follows. Table 3: Comparison of experimental parameters for each embodiment and comparative example. Note: In the above table: hardness is Shore A15; dielectric strength (Mv / m); tensile strength (MPa); elongation at break (%); long-term thermal tensile retention rate: tensile strength retention rate after long-term thermal aging test (%); long-term thermal break retention rate: elongation at break retention rate after long-term thermal aging test (%); where long-term thermal conditions refer to holding at 150°C for 3000 hours before conducting the relevant tests. The inventors do not intend to be bound by any physical, chemical, or mechanical theories regarding the results of the above experiments and tests. However, the inventors discovered in the tests that, according to the pretreatment scheme of the present invention, by adding relatively short-chain linear low-density polyethylene resin and sheet-like mica sheet structures to the compatibility reinforcing components in the related technology, in the absence of crosslinking aids in the initial stage, the relatively short-chain low-density polyethylene (resin) and the sheet-like mica sheet structures combine to form short-chain anti-slip fracture anchor points, which may help improve the long-term thermal tensile retention rate and long-term thermal break retention rate of rubber composites under high temperature and high pressure conditions. Related explanations can be found in the appendix. Figure 1 conduct. refer to Figure 1 Compared to long chains that may emerge after deep polymerization, short chains are more resilient in interweaving and stretching. Furthermore, the short-chain structure itself limits excessive slippage and dislocations in the sheet-like mica structure. In contrast, if auxiliary materials containing benzene ring groups are used, the inventors found that macrocyclic structures or dense benzene rings may widen the gaps between the polymer matrix, causing undesirable twisting or movement of the reinforcing material during stretching.

[0029] Therefore, the applicant further characterized the rubber composite product from Example 1 and the product from Comparative Example 1 by scanning electron microscopy of the cross-sections of the rubber materials after long-term thermal tensile testing. The cross-section of the rubber product from Example 1 can be found in [reference needed]. Figure 2 .

[0030] See Figure 2 The rubber composite material prepared according to the embodiments of the present invention exhibits a relatively uniform cross-sectional structure after thermal tensile testing, without obvious dents, slip dislocations, or tears. Furthermore, the minute white spots can be presumed to be reinforcing anchor points left by the reinforcing material during the tensile process. In contrast, the tested rubber cross-section of the product in Comparative Example 1 can be found in [reference needed]. Figure 3 .from Figure 3 As can be seen, the cross-section of the rubber material shows many dents or marks left after stretching, and the surface texture is relatively less smooth than that of the rubber material. Figure 2 .

[0031] Therefore, the inventors speculate that the combination of short long-chain structures with mica materials is more effective than the combination of high molecular weight polymers or cyclic structures with a large number of benzene rings with mica. This may be because the macrocyclic structure opens up some pores and matrix inside the polymer, resulting in a reduction in the anchoring effect of the reinforcing material.

[0032] In embodiments of the invention, the average particle size (D50) of mica is preferably between 200 mesh and 400 mesh, so as to facilitate combination with long-chain linear low-density polyethylene to form an effective anchoring and reinforcing material.

[0033] Furthermore, in the implementation plan, the weight ratio of mica sheets to methyl vinyl phenyl silicone rubber in the raw material formulation is preferably between 1:25 and 1:8. If the weight ratio or proportion of mica sheets is too high, the hardness will undesirably change to a higher level, thus limiting the wiring or application of high-voltage cables.

[0034] In addition, an excessively high proportion may also reduce the improvement effect of mica on long-term thermal tensile tests, because the toughness and cross-linking of the polymer itself are also factors that must be considered.

[0035] Furthermore, without a separate pre-mixing step, the reinforcing effect of the components and the auxiliary effects of mica and low-density polyethylene are reduced. This may be because, in conventional manufacturing processes, the crosslinking auxiliary components or high-temperature reactions typically cause the rubber material to aggregate and crosslink in a short period of time, making it difficult for the relatively short and densely packed branches to bond with the mica material, resulting in the mica material being trapped in high-molecular-weight organic polymer groups.

[0036] Furthermore, it is obvious that the high-temperature performance of the high-voltage cable rubber material that does not use mica is somewhat degraded compared to the embodiment of the present invention.

[0037] According to the embodiments and technical content described in this specification, the present invention can provide at least the following technical solutions: Although this disclosure includes specific embodiments, it will be apparent to those skilled in the art that various substitutions or changes in form and detail can be made to these embodiments without departing from the inventive point and scope of the claims and their equivalents.

[0038] The embodiments described herein should be considered illustrative only and not for limiting purposes.

[0039] The description of features and aspects in each embodiment is considered applicable to similar features and aspects in other embodiments.

[0040] Therefore, the scope of this disclosure should not be limited by the specific description, but by the technical solutions of the claims, and all variations within the scope of the claims and their equivalents are to be interpreted as being included within the technical solutions of this disclosure.

Claims

1. A method for preparing a special silicone rubber for high-voltage cables in new energy vehicles, characterized in that, The method includes the following steps: Raw material preparation steps: Prepare the following raw materials, including a base silicone rubber component (component A), a compatibility reinforcing component (component B), a flame retardant reinforcing agent (component C), an auxiliary crosslinking component (component D), and an antioxidant component (component E), wherein the base silicone rubber component includes a methyl vinyl phenyl silicone rubber component; and The process of preparing the compatibility-enhancing component includes a compatibility-enhancing component preparation step of pre-mixing mica sheets with linear polymer materials. Preliminary granulation step: A portion of the total planned mass of the base silicone rubber component, flame retardant reinforcing agent component, and auxiliary crosslinking agent component is kneaded in a kneader and then preliminarily granulated in an extruder; The compatibility-enhancing component mixing step involves thoroughly mixing the pre-mixed compatibility-enhancing component obtained in the preliminary granulation step with the pre-mixed compatibility-enhancing component preparation step to obtain a preliminary mixture. Internal mixing step: The preliminary mixture obtained in the above steps is mixed with the remaining part of the total planned mass of the base silicone rubber component, flame retardant reinforcing agent component, and auxiliary crosslinking agent component. Then, the planned mass fraction of antioxidant component is added, and the mixture is internally mixed in an internal mixer to obtain the internally mixed compound. Final granulation step: The obtained intensively mixed material is fed back into an extruder for extrusion to obtain special silicone rubber for high-voltage cables of new energy vehicles; and in addition to the above, the final granulation step is as follows: Preferably, the linear polymer material is linear low-density polyethylene (LDPE).

2. The method for preparing special silicone rubber for high-voltage cables of new energy vehicles according to claim 1, wherein, The raw material preparation steps, by weight, specifically include the following raw material components: The basic silicone rubber components include: 30-70 parts by weight of methyl vinyl phenyl silicone rubber; 20-40 parts by weight of ethylene propylene diene monomer (EPDM) rubber; 5-20 parts by weight of fluororubber; 1-10 parts by weight of polyphenylene ether; 3-15 parts by weight of ethylene-methyl methacrylate copolymer (EMMA); 10-40 parts by weight of linear low-density polyethylene; 1-10 parts by weight of hydroxyl silicone oil; and 1-5 parts by weight of paraffin mineral oil. Compatible reinforcing components: 2-10 parts by weight of maleic anhydride grafted-ethylene acrylate copolymer; 1-10 parts by weight of linear low-density polyethylene; 1-10 parts by weight of mica sheet; Flame retardant reinforcing agent: 5-20 parts by weight of alkyl phosphines; 2-10 parts by weight of melamine polyphosphate; Auxiliary crosslinking components: 0.5-5 parts by weight of triallyl isocyanurate; 0.5-5 parts by weight of triallyl cyanurate; Antioxidant component: Antioxidant 1010, 0.5-2 parts by weight.

3. The method for preparing special silicone rubber for high-voltage cables of new energy vehicles according to claims 1 to 2, wherein, The specific steps of the method include the following processes: Preparation steps for compatibility reinforcement components: The maleic anhydride grafted ethylene acrylate copolymer, linear low-density polyethylene resin and mica sheets in the compatibility reinforcement components are thoroughly mixed in a mixer, maintaining an inert atmosphere and controlling the system temperature at 110℃ to 120℃. After stirring continuously, the mixture is allowed to stand at room temperature for later use. Preliminary granulation step: 40% to 60% of the planned total weight of the base silicone rubber component, 40% to 60% of the planned total weight of the flame retardant reinforcing agent component, and 40% to 60% of the planned total weight of the auxiliary crosslinking agent component are first kneaded in a kneader, and then granulated on a twin-screw extruder to obtain preliminary granules; the temperature of the die head of the twin-screw extruder is controlled between 140℃ and 150℃, and the temperature of the die body is controlled between 120℃ and 130℃; the main extruder speed is controlled between 150±10RPM for preliminary granulation; The mixing step of the compatibility-enhancing component: The preliminary granules prepared in the above steps are mixed with the prepared compatibility-enhancing components. The mixture is initially mixed in an internal mixer. The mixing temperature is controlled at 120℃ to 130℃ and the mixing time is controlled at 5 to 10 minutes to obtain the preliminary mixture. [01] Internal mixing step: The above preliminary mixture is mixed again with the remaining mass of the base silicone rubber component, flame retardant reinforcing agent component and auxiliary crosslinking agent component in a meshing machine. The planned weight of antioxidant is added, and then the mixture is internally mixed in an internal mixer. The mixing temperature is controlled at 140°C to 150°C and the mixing time is controlled at 15 to 20 minutes to obtain the internally mixed mixture. [02] Final granulation step: The intensively mixed material obtained in the above steps is fed into a twin-screw extruder for extrusion granulation. In this step, the temperature of the die head is controlled between 110°C and 120°C, and the temperature of the die body is controlled between 100°C and 110°C to obtain special silicone rubber for high-voltage cables of new energy vehicles.

4. The method for preparing special silicone rubber for high-voltage cables of new energy vehicles according to any one of claims 1 to 3, wherein, [04] The special silicone rubber for high-voltage cables of new energy vehicles obtained in the final granulation step is combined with conductive cables or wires through melt extrusion coating process.

5. The method for preparing special silicone rubber for high-voltage cables of new energy vehicles according to any one of claims 1 to 4, wherein, In the raw material formulation, the weight ratio between mica sheets and methyl vinyl phenyl silicone rubber is set between 1:8 and 1:

25.

6. The method for preparing special silicone rubber for high-voltage cables of new energy vehicles according to any one of claims 1 to 5, wherein, The average particle size (D50) of the mica sheets is between 200 mesh and 400 mesh.

7. A special silicone rubber for high-voltage cables in new energy vehicles, characterized in that, The silicone rubber material is prepared by the method described in any one of claims 1 to 6.

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