High-temperature-resistant long-life cable for new energy automobile charging gun and preparation method thereof

Abstract

The invention relates to the technical field of cables, and discloses a high-temperature-resistant long-service-life cable for a new energy automobile charging gun and a preparation method of the high-temperature-resistant long-service-life cable. The preparation method comprises the following steps: S1, mixing the silicone rubber matrix, the nano silicon dioxide, the aluminum oxide and the composite antioxidant at 100-150 DEG C; s2, processing through a high-temperature and high-pressure blending process to obtain a main insulating layer; s3, externally coating a metal woven mesh layer; s4, mixing weather-resistant polyurethane, graphene nanosheets and an anti-ultraviolet light absorber, and applying pressure to form an outer sheath layer; s5, combining the main insulating layer and the outer sheath layer through a hot pressing or extrusion molding process; and S6, vulcanizing and curing the cable at the temperature of 160-180 DEG C, and cooling to normal temperature after vulcanizing. The composite material main insulation layer and the metal woven mesh layer are combined, so that the technical effect of remarkably improving the overall mechanical strength and the anti-electromagnetic interference capability of the cable is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and specifically to a high-temperature resistant and long-life cable for a new energy vehicle charging gun and a preparation method thereof. Background Art

[0002] With the booming development of the new energy vehicle industry, the demand for cables for charging piles and charging guns has increased sharply. As key components connecting the power source and the vehicle, the performance requirements of these cables are becoming more and more stringent in environments of high temperature, high current, and high-frequency charging. However, the existing charging gun cables generally have problems such as poor temperature resistance, easy aging, and easy cracking. Especially during long-term high-power fast charging, the cable is prone to accelerated aging at high temperature, resulting in cracking of the insulating layer and electrical breakdown, thus shortening the service life of the cable and increasing potential safety hazards.

[0003] Currently, most charging gun cables on the market use traditional rubber or plastic insulating materials. Although these materials can meet the electrical performance requirements in a conventional environment, their performance cannot continuously meet the requirements under the harsh conditions faced by charging gun cables, such as high temperature, long-term load, and high-frequency use. In a high-temperature environment, due to the temperature rise effect caused by high-power charging, the insulating layer of the cable is often easily affected by thermal aging, thereby reducing the durability and stability of the cable. In addition, during frequent fast charging, due to the thermal expansion effect of the cable, deformation and stress concentration are aggravated, further accelerating the aging speed of the material, and ultimately leading to a decline in the reliability of the cable.

[0004] In the prior art, some solutions on the market have improved the performance of the cable by adding antioxidants and anti-ultraviolet materials, or by using more heat-resistant TPE (thermoplastic elastomer) materials. However, these measures have not fundamentally solved the aging problem of the cable in a high-temperature environment. Especially in the case of local overheating caused by high-frequency fast charging, the cable made of traditional materials is still difficult to effectively resist the damage caused by temperature rise. Although materials such as TPE have good heat resistance, their performance in extreme environments still cannot meet the ideal durability and safety requirements. Especially in high-temperature and high-current working environments, the cable is prone to deformation, cracking, and other phenomena.

[0005] Therefore, the present invention proposes a high-temperature resistant and long-life cable for a new energy vehicle charging gun and a preparation method thereof to solve the deficiencies of the prior art. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a high-temperature resistant and long-life cable for a new energy vehicle charging gun and a preparation method thereof, which solves the problems of easy aging, deformation, cracking, and electrical breakdown of the cable in harsh environments such as high temperature, high current, and frequent fast charging in the prior art.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A high-temperature resistant and long-life cable for a new energy vehicle charging gun, comprising: A main insulation layer, by mass parts, comprising 70-75 parts of a silicone rubber matrix, 3-5 parts of nano-silica, 5-7 parts of aluminum oxide, and 2-3 parts of a composite antioxidant; A metal braided mesh layer, the metal braided mesh layer being woven from copper wires; An outer sheath layer, by mass parts, comprising 60-70 parts of weather-resistant polyurethane, 14-17 parts of graphene nanosheets, and 7-13 parts of an ultraviolet absorber.

[0008] The main insulation layer is composed of a silicone rubber matrix, nano-silica, aluminum oxide, and a composite antioxidant. By mass parts, it comprises 70-75 parts of a silicone rubber matrix, 3-5 parts of nano-silica, 5-7 parts of aluminum oxide, and 2-3 parts of a composite antioxidant.

[0009] Silicone rubber matrix: The silicone rubber matrix has excellent electrical insulation performance and thermal stability, and can effectively withstand high temperatures and long-term current loads. Its silicon-oxygen bond structure provides excellent thermal stability, ensuring that the cable is not easily deformed or aged in a high-temperature environment. The flexibility of the silicone rubber also enables the cable to have better bending resistance and adapt to complex charging environments.

[0010] Nano-silica: As a filler, nano-silica not only enhances the mechanical strength of the material, but also improves the thermal conductivity and wear resistance of the cable. The micron-sized and nano-sized particles of nano-silica can fill the voids in the silicone rubber matrix, improve its high-temperature resistance, and reduce the aging rate in a high-temperature environment. Its high specific surface area enhances the thermal stability of the composite material.

[0011] Aluminum oxide: The addition of aluminum oxide improves the thermal insulation and high-temperature resistance of the material. It has a high thermal conductivity and can effectively disperse heat, reducing the temperature rise of the cable under high load conditions and further extending the service life of the cable.

[0012] Composite antioxidant: The addition of the composite antioxidant effectively delays the oxidation and aging process of the material under long-term high-temperature conditions. It can react with free radicals and inhibit the progress of the oxidation chain reaction, thereby reducing the thermal degradation rate of the material and maintaining the long-term stability of the cable.

[0013] The main insulation layer enhances the high-temperature resistance, insulation, anti-aging, and mechanical strength of the cable through the combination of a polymer material (silicone rubber matrix) and functional fillers (such as nano-silica and aluminum oxide). The flexibility of the silicone rubber combined with the rigidity of nano-silica and aluminum oxide gives the cable good balance performance. The composite antioxidant further enhances the antioxidant ability of the cable, thereby extending its service life and reliability.

[0014] The metal braided mesh layer is made of copper wires. The diameter range of the copper wires is 0.1 mm to 0.3 mm. It serves as an electromagnetic shielding layer in the cable to reduce external electromagnetic interference and protect the wires inside the cable from the influence of external electromagnetic interference.

[0015] The metal braided mesh layer has excellent electromagnetic shielding function and structural stability. As an excellent conductive material, copper can effectively block the conduction of electromagnetic waves, reduce the radiation interference of the cable under high-frequency current, and ensure the stable electrical performance of the cable. The structure of the metal mesh increases the mechanical strength of the cable, enabling it to resist external physical pressure and stretching, and enhancing the anti-damage ability of the cable.

[0016] The outer sheath layer, by mass parts, includes 60 - 70 parts of weather-resistant polyurethane, 14 - 17 parts of graphene nanosheets, and 7 - 13 parts of ultraviolet absorber.

[0017] Weather-resistant polyurethane: Weather-resistant polyurethane has good anti-ultraviolet, anti-aging, and weather resistance, and can remain stable during long-term outdoor use. Its excellent wear resistance, flexibility, and corrosion resistance improve the durability of the cable when exposed to the environment.

[0018] Graphene nanosheets: The nanosheets of graphene have extremely high thermal conductivity and strength, which can effectively enhance the thermal stability of the cable and improve its anti-tensile and anti-tearing abilities. The addition of graphene nanosheets can also enhance the heat resistance and pressure resistance of the outer sheath layer, enabling it to adapt to more demanding working environments.

[0019] Ultraviolet absorber: The function of the ultraviolet absorber is to prevent the outer sheath layer from aging, becoming brittle, or peeling off under long-term ultraviolet irradiation. It can absorb ultraviolet rays and convert them into heat energy, thereby slowing down the damage of ultraviolet rays to the polyurethane material and increasing the outdoor service life of the cable.

[0020] The outer sheath layer enhances the weather resistance, wear resistance, and anti-ultraviolet ability of the cable through the combination of high-performance materials. Weather-resistant polyurethane provides strong environmental adaptability for the cable, graphene nanosheets enhance the thermal conductivity and mechanical strength of the cable, and the ultraviolet absorber effectively resists the damage of ultraviolet rays, extending the service life of the cable. The synergistic effect of the three enables the cable to operate stably for a long time in a harsh environment.

[0021] Preferably, the particle size range of the nano-silica is 15 nm to 25 nm.

[0022] Nano-silica is used as an additive in the silicone rubber matrix of the main insulation layer, mainly to improve the high-temperature resistance, anti-aging property and enhance the mechanical properties of the cable. Nano-silica has a high specific surface area and a small particle size (15nm - 25nm), which can be evenly dispersed in the silicone rubber matrix, filling the voids of the material, thereby improving the stability of the material. Nano-silica forms strong interactions with the polymer chains in the silicone rubber matrix, improves the stability of the molecular chains in high-temperature environments, and has good thermal conductivity to help dissipate heat and enhance the high-temperature tolerance of the cable. Its small particle size (15nm - 25nm) enhances the tensile strength, tear resistance and compressive properties of the silicone rubber matrix, improving the mechanical strength of the cable. Nano-silica can also effectively inhibit the oxidation process, delay aging, and reduce the damage of moisture and oxygen to the material through its strong surface adsorption ability, improving durability. In addition, the high specific surface area of nano-silica enables it to form a uniform network structure in the matrix, enhancing the structural strength and insulation performance of the material, ensuring the stable electrical performance of the cable under high current loads. By precisely controlling the particle size range, nano-silica effectively improves the thermal stability and mechanical strength of the cable and delays the aging process, ensuring the long-term reliability of the cable in complex environments.

[0023] Preferably, the diameter of the copper wire of the metal braided mesh layer is 0.1mm - 0.3mm.

[0024] The metal braided mesh layer is mainly used for electromagnetic shielding of the cable and enhancing its mechanical strength. Copper wire has excellent electrical conductivity and strong corrosion resistance, which can effectively prevent external electromagnetic interference and ensure the stable operation of the cable under high-frequency current. The diameter range of the copper wire is controlled between 0.1mm and 0.3mm, which can not only ensure sufficient electromagnetic shielding effect but also maintain a certain flexibility for the bending and laying of the cable. The smaller diameter of the copper wire helps to increase the braiding density and enhance the mechanical protection ability of the cable, enabling it to resist external tensile forces and physical impacts under high-load use and extending the service life of the cable.

[0025] The excellent electrical conductivity of the copper wire enables it to effectively shield electromagnetic interference in the cable, reduce the conduction of electromagnetic waves, and ensure the stable electrical performance of the cable. The smaller diameter of the copper wire ensures high-density braiding, thus enhancing the mechanical strength and toughness of the mesh layer, which can resist external physical pressure and prevent the cable from breaking or being damaged due to external forces. By precisely controlling the diameter of the copper wire, the braided mesh layer of the cable can provide good electromagnetic shielding function and ensure the flexibility and durability of the cable.

[0026] Preferably, the metal braided mesh layer is located outside the main insulation layer, and the outer sheath layer covers the metal braided mesh layer.

[0027] The metal braided mesh layer is located outside the main insulation layer, and the outer sheath layer covers the metal braided mesh layer. The metal braided mesh layer is made of copper wires and is mainly used to provide electromagnetic shielding protection to prevent the influence of external electromagnetic interference on the signals inside the cable. The outer sheath layer provides physical protection to the cable, enhancing its abrasion resistance, UV resistance, and chemical corrosion resistance, ensuring the stability and safety of the cable during long-term use.

[0028] As the electromagnetic shielding layer of the cable, the metal braided mesh layer can effectively block the conduction of electromagnetic waves and prevent external electromagnetic interference from affecting the current signals inside the cable. Copper wires have good electrical conductivity and corrosion resistance, which can ensure the stability of the shielding effect. The position of the metal braided mesh layer outside the main insulation layer can protect the inside of the cable from external electromagnetic interference to the greatest extent without affecting the electrical performance. The outer sheath layer covers the metal braided mesh layer and has a protective effect. It can resist physical damage from the external environment, such as abrasion and compression, and provides functions of UV resistance and anti-aging, enhancing the durability of the cable in outdoor or high-temperature environments. In addition, the presence of the outer sheath layer can also enhance the overall structural strength of the cable, making the cable more durable and reliable.

[0029] Preferably, the composite antioxidant is a composite containing at least graphene and polycyclic aromatic hydrocarbon compounds, and the mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.2 to 1:1.5.

[0030] The composite antioxidant is composed of graphene and polycyclic aromatic hydrocarbon compounds. As a two-dimensional material, graphene has a very high specific surface area and excellent electrical conductivity, which can effectively improve the stability and high-temperature resistance of the composite antioxidant. Polycyclic aromatic hydrocarbon compounds have strong antioxidant properties and can effectively adsorb and neutralize free radicals generated during the use of the cable, slowing down the aging process of the material. The addition of this composite antioxidant is mainly to delay the oxidation reaction of the cable in a long-term high-temperature and high-current environment, thereby improving the service life and reliability of the cable.

[0031] The addition of graphene makes the composite antioxidant have stronger dispersion ability and better stability, which can effectively enhance the dispersion of the antioxidant in the silicone rubber matrix and form a more uniform antioxidant network structure. Polycyclic aromatic hydrocarbon compounds prevent the expansion of the oxidation chain reaction by adsorbing and consuming free radicals in the material, inhibiting the oxidation and aging process. The synergistic effect of graphene and polycyclic aromatic hydrocarbon compounds enhances the antioxidant ability of the cable, delays the degradation of the cable material under high-temperature and high-current working conditions, and ensures the long-term use stability of the cable.

[0032] The present invention also provides a method for preparing a high-temperature resistant and long-life cable for a new energy vehicle charging gun, comprising the following steps: S1. Mix a silicone rubber matrix, nano-silica, aluminum oxide, and a composite antioxidant at a temperature of 100°C to 150°C; The silicone rubber matrix, as the base material, provides the flexibility and insulation of the cable. The addition of nano-silica and aluminum oxide can significantly enhance the thermal stability and antioxidant performance of the silicone rubber. The high specific surface area of the nano-silica particles helps for uniform dispersion, improving the high-temperature resistance and anti-aging ability of the cable. The composite antioxidant further enhances the anti-aging property of the material, preventing the deterioration of the rubber matrix in a high-temperature environment.

[0033] S2. Process the mixture in step S1 through a high-temperature and high-pressure blending process to obtain a main insulation layer; Through the strong shearing action of the high-temperature and high-pressure blending process, the components in the mixture are fully and uniformly distributed, promoting the good combination of the silicone rubber matrix and the fillers (such as nano-silica, aluminum oxide, etc.). This process improves the physical properties of the main insulation layer, such as heat resistance and mechanical strength, enabling the cable to operate stably under high-temperature and high-current conditions.

[0034] S3. Wrap the main insulation layer with a metal braided mesh layer, and the metal braided mesh layer is woven into a mesh by copper wires; the metal braided mesh layer forms a good electromagnetic shielding effect through the weaving of copper wires, effectively preventing the influence of external electromagnetic interference (EMI) on the signals inside the cable and ensuring the signal transmission stability of the cable in a complex environment. In addition, the metal braided mesh layer also enhances the mechanical strength and tensile resistance of the cable, improving the overall stability of the cable.

[0035] S4. Through a hot pressing molding process, mix weather-resistant polyurethane, graphene nanosheets, and an ultraviolet absorber to form the material of the outer sheath layer, and apply a pressure of 20 MPa to 30 MPa at a temperature range of 170°C to 190°C to obtain the outer sheath layer.

[0036] The weather-resistant polyurethane provides excellent weather resistance and ultraviolet resistance for the outer sheath layer, effectively resisting the erosion of factors such as temperature changes, moisture, and ultraviolet rays in the environment on the cable. The addition of graphene nanosheets enhances the abrasion resistance and mechanical strength of the outer sheath layer, improving the durability of the cable during long-term use. The ultraviolet absorber avoids the damage of ultraviolet rays to the outer sheath layer of the cable by absorbing and scattering ultraviolet rays, extending the service life of the cable.

[0037] S5. Combine the main insulation layer wrapped with the metal mesh layer and the outer sheath layer through a hot pressing or extrusion molding process to form a complete cable.

[0038] Through hot pressing or extrusion molding process, the main insulation layer, metal braided mesh layer and outer sheath layer are tightly combined, so that the various layers of cable materials can be firmly bonded together, ensuring the overall structural stability of the cable and reducing interface defects between materials. This process ensures the stability of the cable in high temperature and high current environments, and avoids the performance degradation of the cable due to changes in the use environment.

[0039] S6. The cable obtained in step S5 is vulcanized and cured at a temperature between 160° C. and 180° C. for 30 minutes to 60 minutes. After the vulcanization is completed, the cable is cooled to room temperature to obtain a high-temperature resistant and long-life cable for electric guns of new energy vehicles.

[0040] Through vulcanization, the molecular chain structure of the rubber matrix is ​​cross-linked to form a three-dimensional network structure, which greatly improves the mechanical strength, heat resistance and aging resistance of silicone rubber. The cross-linked network structure produced during the vulcanization process can effectively improve the cable's compression, tensile and wear resistance, ensuring the long-term and stable use of the cable.

[0041] Preferably, the temperature of the high temperature and high pressure blending process is set to 100°C to 150°C, the blending equipment of the high temperature and high pressure blending process is a twin-screw extruder, the screw speed is 150rpm to 250rpm, the pressure is 0.5MPa to 3MPa, and the process duration is 10 minutes to 30 minutes.

[0042] This process fully mixes the silicone rubber matrix, nano-silicon dioxide, aluminum oxide and composite antioxidant to ensure that the materials of the main insulation layer are evenly dispersed and improve its thermal stability and mechanical strength.

[0043] High temperature and high pressure conditions cause the molecular chains of the materials to break and reorganize, improving the compatibility between the components. The screw speed and pressure help to enhance the mixing efficiency, ensure the uniform dispersion of fillers such as nano-silica, and improve the mechanical and electrical properties of the cable. By precisely controlling the process parameters, the cable can maintain stable performance in a high temperature environment.

[0044] Preferably, the molding temperature of the hot pressing molding process is controlled between 180° C. and 200° C., the molding pressure is 20 MPa to 30 MPa, and the thickness of the formed outer sheath layer is 1.5 mm to 2 mm.

[0045] This process uses high temperature and high pressure to evenly cover the outer sheath layer on the metal braided mesh layer, ensuring that they are tightly bonded and provide good physical protection. Appropriate temperature and pressure can optimize the fluidity and bonding strength of the material, ensure the excellent wear resistance, UV resistance and chemical corrosion resistance of the outer sheath layer, and enhance the durability and safety of the cable.

[0046] High temperature enhances the fluidity of the material, and appropriate pressure ensures the tight combination of the outer sheath layer and the inner layer, preventing bubbles and defects. Precise control of the outer sheath layer thickness can ensure that while providing effective protection, the cable maintains flexibility and stability.

[0047] Preferably, the vulcanization and curing process includes: Feeding the cable obtained in step S4 into a vulcanization and curing device; After vulcanization and curing, it is cooled to room temperature to obtain a completed cable product.

[0048] The vulcanization and curing process includes feeding the cable obtained in step S4 into a vulcanization and curing device. After vulcanization and curing, it is cooled to room temperature to obtain a completed cable product. The vulcanization process enhances the mechanical strength, thermal stability, and aging resistance of the cable through cross-linking reactions at high temperatures. By controlling the vulcanization temperature and time, it ensures that the molecular chains of the material form a stable three-dimensional network structure, thereby improving the durability and electrical performance of the cable.

[0049] The cross-linking reaction during vulcanization connects the molecular chains into a three-dimensional network, increasing the strength and high-temperature resistance of the cable. Appropriate vulcanization temperature and time ensure uniform cross-linking, avoiding non-uniform performance caused by over-vulcanization or under-vulcanization. Finally, the cable after cooling to room temperature has excellent physical properties and is suitable for high-temperature and high-load working environments.

[0050] The present invention provides a high-temperature and long-life cable for a new energy vehicle charging gun and its preparation method. It has the following Beneficial effects: 1. By combining a composite main insulation layer and a metal braided mesh layer, it achieves the technical effect of significantly improving the overall mechanical strength and electromagnetic interference resistance of the cable. Compared with the single material design in the prior art, it solves the problem that traditional cables are prone to aging under high temperature and long-term load, and improves the high-temperature tolerance and antioxidant capacity of the cable.

[0051] 2. Through the innovative formulation of nano-silica and a composite antioxidant, it enhances the thermal stability and aging inhibition ability of the cable. Compared with the relatively simple material system (rubber or plastic insulation material) in the prior art, it solves the problem of performance degradation of the cable in high-current and high-temperature environments, and significantly improves the durability and long-term stability of the cable.

[0052] 3. By precisely controlling the thickness and forming process of the outer sheath layer, it improves the abrasion resistance and ultraviolet resistance of the cable. Compared with the prior art solutions lacking effective control of the protective layer thickness, it solves the problem of insufficient protection of the cable during long-term outdoor use, and greatly extends the service life of the cable.

[0053] 4. An electromagnetic shielding metal braided mesh layer is introduced in the design of the cable, achieving a more effective electromagnetic interference shielding effect. Compared with the traditional cable structure in the prior art, it solves the problem of unstable signal transmission of the cable in complex environments and ensures the reliable operation of the cable in high-current environments. Brief Description of the Drawings

[0054] Figure 1 It is the process flow chart of the method of the present invention. Detailed Description of the Embodiments

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings of the present invention specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0056] In the following examples, comparative examples and experiments, the silicone rubber matrix uses Shin-Etsu KE-561-U; the weather-resistant polyurethane uses Huntsman The aluminum oxide uses α-crystalline alumina, and its chemical formula is: α-Al2O3; In the following examples, comparative examples and experiments, the composite antioxidant is prepared from graphene and polycyclic aromatic hydrocarbon compounds. The mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.2 to 1:1.5. Among them, the polycyclic aromatic hydrocarbon compound is pyrene (Pyrene, C 16 H 10 ), and the preparation steps are as follows: Raw Materials and Equipment: Raw Materials: Graphene (Zhongke Yuanda FLG-01); Pyrene (Sigma-Aldrich product number P21409); Dispersion Medium: Absolute ethanol (analytical pure).

[0057] Detailed Steps: Graphene and pyrene are mixed according to the above mass ratio; The mixed graphene and pyrene are added to a ball mill (rotation speed range: 200 - 400 rpm, time: 1 - 3 hours), and zirconia grinding balls (ball-to-material ratio is 4:1 - 6:1) are added; Absolute ethanol (the amount of ethanol used is 2 - 5 times the total mass of the materials) is added until the materials are completely submerged; Ball Milling Parameters: Rotation speed 300 rpm, time 2 hours; The slurry after ball milling is vacuum dried at 70 - 90 °C for 3 - 5 hours; The dried powder is sieved through a 100 - 300 mesh sieve (preferably 200 mesh) to obtain the composite antioxidant.

[0058] Please refer to the appendix Figure 1 : Example 1 The specific steps are as follows: Preparation of the main insulation layer: Mix the silicone rubber matrix, nano-silica, aluminum oxide, and composite antioxidant by mass fraction, specifically: 72 parts of silicone rubber matrix; 4 parts of nano-silica (particle size: 15 nm); 6 parts of aluminum oxide; 2 parts of composite antioxidant (mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.2).

[0059] After mixing, put the materials into a high-temperature and high-pressure blending device, set the temperature to 120 °C, the pressure to 2 MPa, the stirring speed to 200 rpm, and continuously mix for 30 minutes until the components are evenly distributed.

[0060] Preparation of the metal braided mesh layer: Weave copper wires with a diameter of 0.2 mm to form a metal mesh layer.

[0061] Molding of the outer sheath layer: The material of the outer sheath layer consists of weather-resistant polyurethane, graphene nanosheets, and ultraviolet absorber, and the mass fraction ratio is as follows: 65 parts of weather-resistant polyurethane; 15 parts of graphene nanosheets; 8 parts of ultraviolet absorber.

[0062] Use the hot pressing process for molding, set the temperature at 190 °C, the molding pressure at 25 MPa, ensure that the outer sheath layer is evenly molded, and the final thickness is 1.8 mm.

[0063] Cable combination and curing: Through the hot pressing process, wrap the metal braided mesh layer outside the main insulation layer and combine it with the outer sheath layer. Then, carry out curing through the vulcanization curing process, control the temperature at 170 °C, and the duration is 50 minutes. After curing, the cable is cooled to room temperature.

[0064] Example 2 The specific steps are as follows: Formulation of the main insulation layer: Mix the silicone rubber matrix, nano-silica, aluminum oxide, and composite antioxidant by mass fraction, specifically: 74 parts of silicone rubber matrix; 5 parts of nano-silica (particle size: 25 nm); 5 parts of aluminum oxide; 2 parts of composite antioxidant (mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.5).

[0065] Use a temperature of 130 °C to mix the above components evenly, and process them through the high-temperature and high-pressure blending process, with a pressure of 2.5 MPa and continuous mixing for 25 minutes.

[0066] Preparation of the metal braided mesh layer: Select copper wires with a diameter of 0.3 mm. This mesh layer is used for electromagnetic shielding and to enhance the structural strength of the cable.

[0067] Mixing and molding of the outer sheath layer: The material of the outer sheath layer consists of weather-resistant polyurethane, graphene nanosheets, and an ultraviolet absorber. The ratio by mass is as follows: Weather-resistant polyurethane 62 parts; graphene nanosheets 16 parts; ultraviolet absorber 12 parts.

[0068] Hot press these materials at 180 °C, applying a pressure of 28 MPa to form an outer sheath layer with a thickness of 1.6 mm.

[0069] Molding and curing of the cable: Through the hot press process, wrap the metal braided mesh layer outside the main insulation layer and combine it with the outer sheath layer. Then, cure through the vulcanization curing process. The outer sheath layer and the main insulation layer are combined by hot press. Finally, the cable is vulcanized at a temperature of 175 °C for 40 minutes and then cooled to room temperature after completion.

[0070] Example 3 The specific steps are as follows: Preparation of the main insulation layer: Mix the silicone rubber matrix, nano-silica, aluminum oxide, and composite antioxidant by mass, specifically: Silicone rubber matrix 74 parts; nano-silica (particle size: 20 nm) 3 parts; aluminum oxide 6 parts; composite antioxidant 2 parts (the mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.3).

[0071] After mixing, put the materials into a high-temperature and high-pressure blending device, set the temperature at 130 °C, the pressure at 2.5 MPa, the stirring speed at 220 rpm, and continuously mix for 30 minutes until the components are evenly distributed.

[0072] Preparation of the metal braided mesh layer: Weave copper wires into a metal mesh layer with a diameter of 0.25 mm.

[0073] Molding of the outer sheath layer: The material of the outer sheath layer consists of weather-resistant polyurethane, graphene nanosheets, and an ultraviolet absorber. The ratio by mass is as follows: Weather-resistant polyurethane 68 parts; graphene nanosheets 14 parts; ultraviolet absorber 8 parts.

[0074] Use the hot press process for molding, set the temperature at 195 °C, and the molding pressure at 28 MPa to ensure uniform molding of the outer sheath layer with a final thickness of 2.0 mm.

[0075] Cable combination and curing: Through the hot pressing process, the metal braided mesh layer is coated outside the main insulation layer and combined with the outer sheath layer. Then, curing is carried out through the vulcanization curing process, with the temperature controlled at 175 °C and the duration being 55 minutes. After curing is completed, the cable is cooled to room temperature.

[0076] Example 4 The specific steps are as follows: Preparation of the main insulation layer: Mix the silicone rubber matrix, nano-silica, aluminum oxide, and composite antioxidant by mass fraction, specifically: 70 parts of silicone rubber matrix; 5 parts of nano-silica (particle size: 22 nm); 5 parts of aluminum oxide; 3 parts of composite antioxidant (the mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.3).

[0077] After mixing, put the materials into a high-temperature and high-pressure blending equipment, set the temperature at 140 °C, the pressure at 3 MPa, the stirring speed at 180 rpm, and continuously blend for 30 minutes until the components are evenly distributed.

[0078] Preparation of the metal braided mesh layer: Weave copper wires into a metal mesh layer with a diameter of 0.15 mm.

[0079] Molding of the outer sheath layer: The material of the outer sheath layer consists of weather-resistant polyurethane, graphene nanosheets, and ultraviolet absorber, and the ratio by mass fraction is as follows: 62 parts of weather-resistant polyurethane; 16 parts of graphene nanosheets; 10 parts of ultraviolet absorber.

[0080] Use the hot pressing process for molding, set the temperature at 185 °C, the molding pressure at 30 MPa, ensure uniform molding of the outer sheath layer, and the final thickness is 1.6 mm.

[0081] Cable combination and curing: Through the hot pressing process, the metal braided mesh layer is coated outside the main insulation layer and combined with the outer sheath layer. Then, curing is carried out through the vulcanization curing process, with the temperature controlled at 180 °C and the duration being 60 minutes. After curing is completed, the cable is cooled to room temperature.

[0082] Example 5 The specific steps are as follows: Preparation of the main insulation layer: Mix the silicone rubber matrix, nano-silica, aluminum oxide, and composite antioxidant by mass fraction, specifically: 75 parts of silicone rubber matrix; 4 parts of nano-silica (particle size: 18 nm); 5 parts of aluminum oxide; 3 parts of composite antioxidant (the mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.2).

[0083] After mixing, the materials are put into a high-temperature and high-pressure blending equipment. The temperature is set at 125 °C, the pressure is 2.2 MPa, the stirring speed is 210 rpm, and the blending continues for 30 minutes until the components are evenly distributed.

[0084] Preparation of the metal braided mesh layer: Copper wires are braided into a metal mesh layer with a diameter of 0.3 mm.

[0085] Molding of the outer sheath layer: The material of the outer sheath layer consists of weather-resistant polyurethane, graphene nanosheets, and an ultraviolet absorber. The ratio by mass is as follows: Weather-resistant polyurethane 64 parts; graphene nanosheets 15 parts; ultraviolet absorber 7 parts.

[0086] The hot pressing process is used for molding. The temperature is set at 190 °C, and the molding pressure is 28 MPa to ensure uniform molding of the outer sheath layer with a final thickness of 2.2 mm.

[0087] Cable assembly and curing: Through the hot pressing process, the metal braided mesh layer is coated outside the main insulation layer and combined with the outer sheath layer. Then, curing is carried out through the vulcanization curing process. The temperature is controlled at 165 °C, and the duration is 55 minutes. After curing, the cable is cooled to room temperature.

[0088] Comparative Example 1: Based on Example 1, the loading ratio of nano-silica in the main insulation layer was slightly adjusted, and the proportion of the ultraviolet absorber in the outer sheath layer was changed. Other components remained unchanged.

[0089] Specifically as follows: Preparation of the main insulation layer: 74 parts of silicone rubber matrix; 4 parts of nano-silica (particle size: 15 nm); 6 parts of aluminum oxide; 2 parts of composite antioxidant (mass ratio of graphene to polycyclic aromatic hydrocarbon compounds is 1:1.2).

[0090] In this comparison, the proportion of nano-silica is slightly reduced compared to Example 1.

[0091] Ratio of the outer sheath layer: 65 parts of weather-resistant polyurethane; 15 parts of graphene nanosheets; the ultraviolet absorber is reduced to 6 parts; Other components and process steps: Remain the same as in Example 1.

[0092] Comparative Example 2: Based on Example 2, the diameter of the copper wire in the metal braided mesh layer was adjusted to 0.15 mm. Other components and steps remained unchanged.

[0093] Specifically as follows: Preparation of the metal braided mesh layer: The diameter of the copper wire is 0.15 mm, which is reduced compared to 0.3 mm in Example 2.

[0094] Other components and process steps: The same as in Example 2.

[0095] Comparative Example 3: Based on Example 3, the diameter of the copper wire was adjusted to 0.5 mm. Other components remained unchanged.

[0096] Specifically as follows: Metal braided mesh layer: The diameter of the copper wire was adjusted to 0.5 mm (while the diameter of the copper wire in Example 3 was 0.25 mm).

[0097] Other components and process steps: The same as in Example 3.

[0098] Comparative Example 4: Based on Example 4, aluminum oxide was not used as a filler. Only the silicone rubber matrix, nano-silica, and composite antioxidant were used to form the main insulation layer. Other steps and components remained unchanged.

[0099] Specifically as follows: Preparation of the main insulation layer: 70 parts of silicone rubber matrix; 5 parts of nano-silica; Missing aluminum oxide: 3 parts of composite antioxidant.

[0100] Other components and process steps: The same as in Example 4.

[0101] Comparative Example 5: Based on Example 5, the proportion of weather-resistant polyurethane in the outer sheath layer was reduced to 50 parts. Other components and steps remained unchanged.

[0102] Specifically as follows: Ratio of the outer sheath layer: 50 parts of weather-resistant polyurethane; 15 parts of graphene nanosheets; 7 parts of ultraviolet absorber.

[0103] Other components and process steps: The same as in Example 5.

[0104] Experiment 1 Experimental steps: Sample preparation: Prepare two groups of cable samples, one group prepared according to the formula and process of Example 1, and the other group prepared according to the formula and process of Comparative Example 1. Ensure that the samples are of the same size and have a smooth surface for subsequent testing.

[0105] High-temperature aging test: Place the prepared cable samples in a high-temperature aging oven. Set the temperature to 180 °C and the experimental period to 6 days. During the entire period, take out the samples once every two days for resistance change testing, appearance change inspection, and determination of the thermal degradation rate. When sampling each time, also record the cable surface temperature to ensure the consistency of the test process.

[0106] Resistance change test: The four-terminal method is used to measure the resistance change of the cable, and the change situation is recorded each time a sample is taken. Through the change of resistance, the electrical conductivity of the cable material is evaluated.

[0107] Appearance inspection: Focus on observing whether there are phenomena such as discoloration and cracking on the cable surface, and record the changes in each cycle in detail. Appearance changes help to judge the physical damage of the cable.

[0108] Thermal degradation rate test: Measure the thermal degradation rate of the cable each time it is inspected. This test can judge the heat resistance ability of the cable in a high-temperature environment and help evaluate the aging process of the cable material.

[0109] Data recording: Table 1: High-temperature aging test data 1 In Example 1, the resistance change is relatively small, only increasing from 2.0% to 2.8% in 6 days, indicating that its electrical conductivity maintains good stability in a high-temperature aging environment. This benefits from the heat resistance of the silicone rubber matrix and the strengthening effect of nano-silica. Nano-silica not only fills the tiny voids inside the material, improving the thermal stability, but also effectively inhibits the rapid growth of resistance. In terms of appearance, there is no obvious change in Example 1 in the first two days, then slight discoloration gradually appears and deepens on the last day, but no cracks appear, indicating that its overall mechanical strength is still relatively high.

[0110] In contrast, the resistance change in Comparative Example 1 is significantly faster, rising from 5.5% to 6.8%, and the growth rate of the thermal degradation rate is also relatively fast, finally reaching 9.1%. The appearance change is more obvious, from slight discoloration to the appearance of fine cracks, and then obvious cracks are formed on the sixth day, indicating its poor high-temperature resistance. This phenomenon can be attributed to the lack of the strengthening effect of nano-silica, making the material more prone to aging at high temperatures. At the same time, the surface temperature of Comparative Example 1 is always about 3 - 5 °C higher than that of Example 1, indicating that its heat dissipation ability is relatively poor, and heat accumulates inside the material, exacerbating the aging process.

[0111] Overall, the experimental results prove that the combination of nano-silica in the main insulation layer and the ultraviolet absorber in the sheath layer can effectively improve the high-temperature resistance of the cable, slow down the resistance growth rate, and delay the appearance aging and structural damage. In contrast, Comparative Example 1 lacking these key components deteriorates rapidly in a high-temperature environment, showing faster electrical property decline and mechanical property degradation.

[0112] Experiment 2 Experimental steps: Sample Preparation: Prepare two groups of cable samples. One group is prepared according to the formulation and process of Example 2, and the other group is prepared according to the formulation and process of Comparative Example 2. Ensure that the samples are of the same size and have a smooth surface for subsequent testing.

[0113] High-temperature Aging Test: Place the prepared cable samples in a high-temperature aging oven, set the temperature to 180°C, and the experimental period to 6 days. During the entire period, take out the samples once every two days for resistance change testing, appearance change inspection, and thermal degradation rate measurement. At the same time, record the surface temperature of the cable to ensure the consistency of the testing process.

[0114] Resistance Change Test: Measure the resistance change of the cable using the four-terminal method and record the data at each sampling. Evaluate the stability of the electrical conductivity of the cable material in a high-temperature aging environment through the resistance change.

[0115] Appearance Inspection: Observe whether there are phenomena such as discoloration and cracks on the surface of the cable and record the changes in detail for each period. The appearance change can reflect the physical damage of the cable material.

[0116] Thermal Degradation Rate Test: Measure the thermal degradation rate of the cable at each sampling, analyze the degradation degree of the material in a high-temperature environment, and evaluate its heat resistance.

[0117] Experimental Data: Table 2: High-temperature Aging Test Data 2 The aging data of Example 2 and Comparative Example 2 are similar, proving that a copper wire diameter of 0.15 mm will not have a significant impact on the high-temperature tolerance.

[0118] The aging rate of Comparative Example 2 is slightly faster than that of Example 2, but the change range is very small, indicating that 0.15 mm still belongs to a reasonable selection range.

[0119] The trends of resistance change, appearance deterioration, surface temperature, and thermal degradation rate are reasonable, and a copper wire diameter of 0.15 mm will not cause a rapid decline in material performance.

[0120] The experimental results verify the correctness of 0.1 mm - 0.3 mm as a reasonable range and prove that 0.15 mm still belongs to the acceptable range and will not significantly reduce the high-temperature aging resistance of the cable.

[0121] Experiment 3 Experimental Procedures: Sample Preparation: Prepare two groups of cable samples. One group is prepared according to the formulation and process of Example 3, and the other group is prepared according to the formulation and process of Comparative Example 3. Ensure that the samples are of the same size and have a smooth surface for subsequent testing.

[0122] High-temperature aging test: Place the prepared cable samples in a high-temperature aging oven. Set the temperature to 180°C and the experimental period to 6 days. During the entire period, take out the samples every two days for resistance change test, appearance change inspection, and determination of the thermal degradation rate. When sampling each time, also record the surface temperature of the cable to ensure the consistency of the test process.

[0123] Resistance change test: Use the four-terminal method to measure the resistance change of the cable and record the change situation at each sampling. Evaluate the electrical conductivity of the cable material through the change in resistance.

[0124] Appearance inspection: Focus on observing whether there are phenomena such as discoloration and cracking on the surface of the cable and record the changes in each period in detail. Appearance changes help to judge the physical damage of the cable.

[0125] Thermal degradation rate test: Measure the thermal degradation rate of the cable during each inspection. This test can judge the heat resistance ability of the cable in a high-temperature environment and help evaluate the aging process of the cable material.

[0126] Experimental data: Table 3: High-temperature aging test data 3 This experiment shows that: The copper wire diameter of 0.5mm is too large, resulting in an increase in resistance fluctuation and an accelerated aging trend, indicating that its electrical conductivity and heat resistance are both lower than the reasonable range of 0.1mm - 0.3mm.

[0127] Too thick copper wire reduces the flexibility of the metal braid, causing cracks to appear earlier during the aging process and a decrease in mechanical properties. The thicker the copper wire, the worse the heat dissipation performance, and the local temperature is more likely to rise, affecting the long-term stability of the cable.

[0128] Although the 0.5mm copper wire has certain electrical conductivity, its heat dissipation ability decreases, the aging trend accelerates, and the mechanical flexibility decreases. The experimental data prove that the range of 0.1mm - 0.3mm is a more scientific and reasonable diameter range for the copper wire of the metal braid.

[0129] Experiment 4 Experimental procedure: Sample preparation: Prepare two groups of cable samples. One group is prepared according to the formula and process of Example 4, and the other group is prepared according to the formula and process of Comparative Example 4. Ensure that the sample sizes are the same and the surfaces are smooth for subsequent testing.

[0130] High-temperature aging test: Place the prepared cable samples in a high-temperature aging chamber. Set the temperature to 180 °C and the experimental period to 6 days. During the entire period, take out the samples every two days for resistance change test, appearance change inspection, and determination of the thermal degradation rate. When sampling each time, also record the surface temperature of the cable to ensure the consistency of the test process.

[0131] Resistance change test: Use the four-terminal method to measure the resistance change of the cable and record the change situation each time of sampling. Evaluate the electrical conductivity of the cable material through the change of resistance.

[0132] Appearance inspection: Focus on observing whether phenomena such as discoloration and cracking occur on the cable surface and record the changes in each period in detail. Appearance changes help to judge the physical damage condition of the cable.

[0133] Thermal degradation rate test: Measure the thermal degradation rate of the cable each time of inspection. This test can judge the heat resistance ability of the cable in a high-temperature environment and help to evaluate the aging process of the cable material.

[0134] Experimental data: Table 4: High-temperature aging test data 4 In Example 4, the resistance change is relatively small, only increasing from 1.5% to 2.4% within 6 days. Only slight discoloration appears on the appearance, and there are no cracks, indicating its good high-temperature resistance performance. This benefits from the addition of aluminum oxide filler, which improves the heat resistance, antioxidant ability of the material, and slows down the resistance growth rate.

[0135] In Comparative Example 4 (without using aluminum oxide filler), the resistance changes faster, rising from 1.8% to 3.5%. The final thermal degradation rate reaches 6.5%, and obvious cracks appear on the sixth day, showing worse high-temperature resistance performance. The lack of aluminum oxide filler makes the material more prone to aging and decomposition at high temperatures, resulting in a decrease in mechanical strength.

[0136] In addition, the surface temperature of Comparative Example 4 is always about 1 - 2 °C higher than that of Example 4, indicating that its heat dissipation ability is weaker, heat is more likely to accumulate, and aging is accelerated. The addition of aluminum oxide filler improves the thermal conductivity of the material, making Example 4 maintain a lower temperature and delaying the aging process.

[0137] The experimental results show that the aluminum oxide filler significantly improves the high-temperature resistance performance of the cable, slows down the resistance growth, and enhances the mechanical stability. Due to the non-use of aluminum oxide filler in Comparative Example 4, the aging is accelerated at high temperatures, and the electrical and mechanical properties decline. Therefore, it is recommended to add aluminum oxide filler to the main insulation layer to improve the high-temperature stability and service life of the cable.

[0138] Experiment 5 Experimental steps: Sample Preparation: Prepare two groups of cable samples. One group is prepared according to the formulation and process of Example 5, and the other group is prepared according to the formulation and process of Comparative Example 5. Ensure that the sample sizes are consistent and the surfaces are smooth for subsequent testing.

[0139] High-Temperature Aging Test: Place the prepared cable samples in a high-temperature aging oven, set the temperature to 180 °C, and the experimental period to 6 days. During the entire period, take out the samples once every two days for resistance change testing, appearance change inspection, and determination of the thermal degradation rate. Each time a sample is taken, also record the cable surface temperature to ensure the consistency of the test process.

[0140] Resistance Change Test: Use the four-terminal method to measure the resistance change of the cable and record the change situation each time a sample is taken. Evaluate the electrical conductivity of the cable material through the change in resistance.

[0141] Appearance Inspection: Focus on observing whether phenomena such as discoloration and cracking occur on the cable surface and record the changes in detail for each period. Appearance changes help to judge the physical damage situation of the cable.

[0142] Thermal Degradation Rate Test: Measure the thermal degradation rate of the cable each time it is inspected to judge the heat resistance ability of the cable in a high-temperature environment and help evaluate the aging process of the cable material.

[0143] Experimental Data: Table 5: High-Temperature Aging Test Data 5 The resistance change of Example 5 is relatively small, increasing from 1.8% to 2.5%, indicating that the cable maintains good electrical conductivity in a high-temperature aging environment. In terms of appearance, the cable of Example 5 did not show obvious cracks within 6 days and only had slight discoloration, indicating its good high-temperature resistance, and the proportion of weather-resistant polyurethane being 60 parts helps to maintain its stability.

[0144] In contrast, the resistance change of Comparative Example 5 is relatively large, increasing from 2.5% to 3.6%, and the thermal degradation rate increases rapidly, finally reaching 6.8%. In appearance, it also changed from slight discoloration to obvious cracks, indicating its poor high-temperature resistance. These phenomena show that when the proportion of weather-resistant polyurethane in the outer sheath layer is reduced to 50 parts, the heat resistance of the material significantly decreases.

[0145] In addition, the surface temperature of Comparative Example 5 is always about 1 - 2 °C higher than that of Example 5, indicating its poor heat dissipation ability, which further exacerbates the aging process. On the contrary, the higher proportion of weather-resistant polyurethane in Example 5 can better stabilize the thermal performance of the material and maintain a lower surface temperature.

[0146] The experimental results show that the proportion of weather-resistant polyurethane has a significant impact on the heat resistance of the cable. When its proportion is reduced to 50 parts, the heat resistance of the cable decreases significantly, manifested as a greater change in resistance, a faster thermal degradation rate, and cracks on the surface, etc. In contrast, when the proportion of weather-resistant polyurethane is 60 parts, the heat resistance of the cable is significantly improved, the aging process is slower, and the stability of the material is better.

[0147] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High temperature resistant and long life cable for new energy vehicle charging gun, characterized in that: include: The main insulating layer comprises, by weight, 70 to 75 parts of a silicone rubber matrix, 3 to 5 parts of nano-silicon dioxide, 5 to 7 parts of aluminum oxide and 2 to 3 parts of a composite antioxidant; A metal braided mesh layer, wherein the metal braided mesh layer is braided with copper wires; The outer sheath layer comprises, by weight, 60 to 70 parts of weather-resistant polyurethane, 14 to 17 parts of graphene nanosheets and 7 to 13 parts of anti-ultraviolet absorbent.

2. The high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 1, characterized in that: The particle size of the nano silicon dioxide is in the range of 15nm to 25nm.

3. The high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 1, characterized in that: The diameter of the copper wires of the metal braided mesh layer is 0.1 mm to 0.3 mm.

4. The high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 1, characterized in that: The metal braided mesh layer is located outside the main insulating layer, and the outer sheath layer is covered outside the metal braided mesh layer.

5. The high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 1, characterized in that: The composite antioxidant is a composite material containing at least graphene and condensed-ring aromatic hydrocarbon compounds, and the mass ratio of the graphene to the condensed-ring aromatic hydrocarbon compounds is 1:1.2 to 1:1.

5.

6. A method for preparing a high-temperature resistant and long-life cable for a new energy vehicle charging gun, which is used to prepare a high-temperature resistant and long-life cable for a new energy vehicle charging gun as described in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Mixing a silicone rubber matrix, nano-silicon dioxide, aluminum oxide and a composite antioxidant at a temperature of 100° C. to 150° C.; S2, processing the mixture in step S1 through a high temperature and high pressure blending process to obtain a main insulating layer; S3, covering the main insulating layer with a metal braided mesh layer, wherein the metal braided mesh layer is woven into a mesh by copper wires; S4, mixing weather-resistant polyurethane, graphene nanosheets and anti-ultraviolet absorber through a hot pressing process to form a material for an outer sheath layer, and applying a pressure of 20MPa to 30MPa at a temperature range of 170°C to 190°C to obtain an outer sheath layer; S5, combining the main insulation layer covered with the metal mesh layer with the outer sheath layer through a hot pressing or extrusion molding process to form a complete cable; S6. The cable obtained in step S5 is vulcanized and cured at a temperature between 160° C. and 180° C. for 30 minutes to 60 minutes. After the vulcanization is completed, the cable is cooled to room temperature to obtain a high-temperature resistant and long-life cable for electric guns of new energy vehicles.

7. The method for preparing a high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 6, characterized in that: The temperature of the high temperature and high pressure blending process is set at 100°C to 150°C, the blending equipment of the high temperature and high pressure blending process is a twin-screw extruder, the screw speed is 150rpm to 250rpm, the pressure is 0.5MPa to 3MPa, and the process duration is 10 minutes to 30 minutes.

8. The method for preparing a high temperature resistant and long life cable for a new energy vehicle charging gun according to claim 6, characterized in that: The molding temperature of the hot pressing molding process is controlled between 180° C. and 200° C., the molding pressure is 20 MPa to 30 MPa, and the thickness of the formed outer sheath layer is 1.5 mm to 2 mm.

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