Flame-retardant high-temperature-resistant power cable and preparation method thereof
By performing ultrasonic shot peening and microarc oxidation on the surface of the conductor, combined with the insulating layer wrapping technology blended with modified flame retardant and polypropylene, the problem of degradation of existing flame retardant cables is solved, and efficient low temperature resistance and corrosion resistance are achieved.
Patent Information
- Application Number
- CN202411914093.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-05-09
AI Technical Summary
During the use of existing flame retardant cables, the addition of inorganic flame retardant will change the performance of the glue, resulting in a decrease in the mechanical properties of the cable and a decrease in corrosion resistance.
By ultrasonic shot peening on the surface of the conductor, plastic deformation and compressive residual stress are formed, and the grains are refined; then, ammonium cobalt phosphate and 3-aminopropyltriethoxysilane are used as electrolyte, and microarc oxidation is performed to form a ceramic oxide film; at the same time, the modified flame retardant is blended with polypropylene and wrapped around the periphery of the conductor to form an insulating layer.
It improves the low-temperature resistance and conductivity of the cable, enhances the mechanical properties and corrosion resistance, and achieves high transmission efficiency, flame retardant, low-temperature resistance and corrosion resistance.
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Figure BDA0005206430450000071
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cables, in particular to a flame-retardant and high-temperature resistant power cable and a preparation method thereof. Background Art
[0002] In recent years, with the increasing development and popularity of the use of wires and cables in production and life, the demand for wires and cables has increased rapidly. Moreover, with the development of the economy, the requirements for their materials are getting higher and higher, requiring softness, wear resistance, low temperature resistance and other properties. The most common ones are flame-retardant cables, which refer to cables that are burned under specified test conditions, and after the test fire source is removed, the spread of the flame is only within a limited range, and the residual flame or residual burning can extinguish itself within a limited time. Its fundamental characteristics are: it may be burned and unable to operate in the event of a fire, but it can prevent the spread of the fire. In layman's terms, if the wire catches fire, the burning can be limited to a local area, without spreading, and other various equipment can be saved to avoid causing greater losses. It can protect life and property safety to a greater extent, so it is more commonly used. In the field of cable flame retardancy, flame retardant materials are usually added to improve the flame retardancy of cables. Inorganic flame retardants and fillers are frequently used flame retardants. In actual use, the addition of inorganic flame retardants will change the vulcanization properties, physical and mechanical properties, and thermal properties of the rubber. At the same time, these powders are very easy to agglomerate, which directly affects the flame retardant effect of the inorganic filler particles. These agglomerated inorganic flame retardants and fillers will greatly cause void defects inside the material, thereby leading to a decrease in the overall mechanical properties of the cable material and a decrease in corrosion resistance. Summary of the invention
[0003] The object of the present invention is to provide a flame retardant and high temperature resistant power cable and a preparation method thereof, so as to solve the problems existing in the prior art.
[0004] In order to solve the above technical problems, the present invention provides the following technical solution: a method for preparing a flame-retardant and high-temperature resistant power cable, comprising the following preparation steps:
[0005] (1) 7 to 15 parts of ferric nitrate, 6 to 16 parts of chromium sulfate, and 55 to 95 parts of deionized water are mixed uniformly, heated to 55 to 75° C., and stirred at 110 rpm, and the pH value is adjusted to 9.5 to 10.5 with a 2 mol / L sodium hydroxide aqueous solution, and the reaction is carried out for 14 to 30 hours. After the reaction is completed, 20 to 38 parts of the prepolymer solution are added at a rate of 2 drops / s, and the reaction is continued for 5 to 11 hours. The solid is collected by filtration, washed with deionized water for 3 times, dried in an oven at 35 to 45° C. for 12 to 24 hours, and ground into a powder with a particle size of 30 to 60 nm to prepare a modified flame retardant;
[0006] (2) After cleaning the copper conductor, place it in an ultrasonic shot peening device and use a 1 mm stainless steel ball as the shot peening medium for 5 to 15 minutes to obtain a shot peened conductor;
[0007] (3) After the conductor is pretreated after shot peening, it is placed in an electrolyte and oxidized for 3 to 5 minutes under the conditions of voltage 350 V, frequency 380 Hz, and pulse width 90 μs. It is taken out and washed with deionized water for 3 times, and placed in an oven at 40 to 50° C. to dry for 16 to 24 hours to obtain a micro-arc oxidation conductor;
[0008] (4) 45 to 55 parts of polypropylene, 1 to 3 parts of antioxidant, and 3 to 7 parts of modified flame retardant are uniformly mixed, melted and extruded at 175 to 185° C. to coat the micro-arc oxidation conductor to form an insulating layer, thereby obtaining an insulated battery cell;
[0009] (5) A copper wire shielding layer is braided on the outer periphery of the insulating core by a braiding machine, and then styrene-butadiene rubber is extruded on the outer periphery of the shielding layer at 150-170° C. and naturally cooled to room temperature to obtain a flame-retardant and high-temperature resistant power cable.
[0010] Furthermore, the preparation steps of the prepolymer solution in step (1) are as follows: 8 to 16 parts of benzene-1,2,3-triamine, 5 to 11 parts of formyltrimethylammonium chloride, and 60 to 130 parts of ethanol are mixed uniformly, the pH value is adjusted to 8.5 to 9.5 with a 2 mol / L sodium hydroxide aqueous solution, the temperature is raised to 60 to 70° C., stirred at 100 rpm for 2 to 4 hours, and allowed to stand for 1 to 2 hours to obtain a prepolymer solution.
[0011] Furthermore, the cross-sectional area of the copper conductor in step (2) is 0.5 to 400 mm 2 .
[0012] Furthermore, the parameters of the shot peening equipment in step (2) are a vibration frequency of 16 to 22 kHz and an amplitude of 25 to 35 μm.
[0013] Furthermore, the pretreatment step in step (3) is as follows: soaking the shot-peened conductor in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washing it with deionized water for 3 times, and then soaking it in a 15 wt % nitric acid aqueous solution for 1 min, and washing it with deionized water for 3 times.
[0014] Furthermore, the preparation steps of the electrolyte in step (3) are as follows: 0.7 parts of ammonium cobalt phosphate, 0.5 parts of 3-aminopropyltriethoxysilane, and 100 parts of deionized water are mixed evenly, and filtered with filter paper to obtain an electrolyte.
[0015] Furthermore, the molecular weight of the polypropylene in step (4) is 200,000 to 600,000.
[0016] Furthermore, the antioxidant in step (4) is a mixture of any one or more of antioxidant 3114, antioxidant 618, and antioxidant B215.
[0017] Furthermore, the thickness of the insulating layer in step (4) is 0.5 to 2.5 mm.
[0018] Furthermore, the diameter of the copper wire in step (5) is 0.1 to 0.2 mm.
[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0020] The present invention performs ultrasonic shot peening on the surface of the conductor to cause plastic deformation on the surface of the conductor and generate compressive residual stress at the surface position, thereby refining the grains, reducing the phenomenon of cracks caused by excessive contraction of crystals at low temperatures, reducing the obstruction to electronic conduction, and thus improving the low-temperature resistance and conductive efficiency of the cable; then, ammonium cobalt phosphate and 3-aminopropyltriethoxysilane are used as electrolytes to perform micro-arc oxidation treatment to form uniformly distributed micron-sized discharge holes with a grid structure similar to a "volcanic cone". During the current transmission process, its larger surface area can improve the heat dissipation effect and reduce the effect of temperature on resistance. Influence, maintaining the stability of current transmission, at the same time, the introduction of cobalt ions, silicate ions and phosphate groups can react with the surface of the conductor to form a ceramic oxide film, which has good stability in low temperature environment, thereby enhancing the low temperature resistance; polypropylene and modified flame retardant are blended and wrapped around the conductor to form an insulating layer, and the modified flame retardant is adsorbed on the surface of the ceramic film through electrostatic attraction, filling the pores in the ceramic film, enhancing the mechanical properties of the cable while resisting chemical corrosion; finally, the shielding layer and the sheath are assembled to obtain a flame retardant and high temperature resistant power cable to achieve high transmission efficiency, flame retardancy, low temperature resistance and corrosion resistance. DETAILED DESCRIPTION
[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0022] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the flame-retardant and high temperature resistant power cables prepared in the following examples are as follows:
[0023] Tensile strength: The insulated cells prepared in the embodiment and the comparative example with the same length were placed in 0°C and -50°C environments for 100 h, respectively, and tested using the standard GB / T 1040.
[0024] Flame retardant level: The insulated cells prepared in the embodiment and the comparative example with the same length were tested in accordance with GB / T 2408.
[0025] Volume resistivity: The insulating cells prepared in the embodiment and the comparative example with the same length were tested according to GB / T 1410 at a test voltage of 1 kV.
[0026] Example 1
[0027] (1) 8 parts of benzene-1,2,3-triamine, 5 parts of formylmethyltrimethylammonium chloride, and 60 parts of ethanol were mixed uniformly, the pH value was adjusted to 8.5 with a 2 mol / L sodium hydroxide aqueous solution, the temperature was raised to 60° C., the mixture was stirred at 100 rpm for 2 h, and the mixture was allowed to stand and be kept warm for 1 h to prepare a prepolymer solution;
[0028] (2) 7 parts of ferric nitrate, 6 parts of chromium sulfate and 55 parts of deionized water were mixed uniformly, the temperature was raised to 55° C., and the pH value was adjusted to 9.5 with a 2 mol / L sodium hydroxide aqueous solution under stirring at 110 rpm. The reaction was carried out for 14 hours. After the reaction was completed, 20 parts of the prepolymer solution were added at a rate of 2 drops / s, and the reaction was continued for 5 hours. The solid was collected by filtration, washed with deionized water for 3 times, dried in an oven at 35° C. for 12 hours, and ground into a powder with a particle size of 30 nm to obtain a modified flame retardant;
[0029] (3) The cross-sectional area is 0.5 mm 2 The copper conductor was cleaned and placed in an ultrasonic shot peening device. A 1 mm stainless steel ball was used as the shot peening medium. The shot peening was performed at a vibration frequency of 16 kHz and an amplitude of 25 μm for 5 minutes to obtain a shot peened conductor.
[0030] (4) 0.7 parts of ammonium cobalt phosphate, 0.5 parts of 3-aminopropyltriethoxysilane, and 100 parts of deionized water were mixed evenly, and filtered through filter paper to prepare an electrolyte;
[0031] (5) The conductor after shot peening was immersed in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washed with deionized water for 3 times, immersed in a 15 wt % nitric acid aqueous solution for 1 min, washed with deionized water for 3 times, placed in an electrolyte, oxidized for 3 min at a voltage of 350 V, a frequency of 380 Hz, and a pulse width of 90 μs, taken out, washed with deionized water for 3 times, and dried in a 40° C. oven for 16 h to obtain a micro-arc oxidation conductor;
[0032] (6) 45 parts of polypropylene with a molecular weight of 200,000, 1 part of antioxidant 3114, and 3 parts of modified flame retardant were mixed evenly, melted and extruded at 175° C. to coat the micro-arc oxidation conductor to form an insulating layer with a thickness of 0.5 mm, thereby obtaining an insulated battery core;
[0033] (7) A shielding layer with a copper wire diameter of 0.1 mm is woven on the periphery of the insulating core using a braiding machine, and then styrene-butadiene rubber is extruded on the periphery of the shielding layer at 150° C. and naturally cooled to room temperature to obtain a flame-retardant and high-temperature resistant power cable.
[0034] Example 2
[0035] (1) 12 parts of benzene-1,2,3-triamine, 8 parts of formylmethyltrimethylammonium chloride, and 95 parts of ethanol were mixed uniformly, the pH value was adjusted to 9 with a 2 mol / L sodium hydroxide aqueous solution, the temperature was raised to 65° C., the mixture was stirred at 100 rpm for 3 h, and the mixture was allowed to stand and be kept warm for 1.5 h to prepare a prepolymer solution;
[0036] (2) 11 parts of ferric nitrate, 11 parts of chromium sulfate and 75 parts of deionized water were mixed uniformly, the temperature was raised to 65° C., and the pH value was adjusted to 10 with a 2 mol / L sodium hydroxide aqueous solution under stirring at 110 rpm. The mixture was reacted for 22 hours. After the reaction was completed, 29 parts of the prepolymer solution was added at a rate of 2 drops / s, and the reaction was continued for 8 hours. The solid was collected by filtration, washed with deionized water for 3 times, dried in an oven at 40° C. for 18 hours, and ground into a powder with a particle size of 45 nm to obtain a modified flame retardant;
[0037] (3) Set the cross-sectional area to 200mm 2 The copper conductor was cleaned and placed in an ultrasonic shot peening device. A 1 mm stainless steel ball was used as the shot peening medium. The shot peening was performed at a vibration frequency of 19 kHz and an amplitude of 30 μm for 10 min to obtain a shot peened conductor.
[0038] (4) 0.7 parts of ammonium cobalt phosphate, 0.5 parts of 3-aminopropyltriethoxysilane, and 100 parts of deionized water were mixed evenly, and filtered through filter paper to prepare an electrolyte;
[0039] (5) The conductor after shot peening was immersed in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washed with deionized water for 3 times, immersed in a 15 wt % nitric acid aqueous solution for 1 min, washed with deionized water for 3 times, placed in an electrolyte, oxidized for 4 min at a voltage of 350 V, a frequency of 380 Hz, and a pulse width of 90 μs, taken out, washed with deionized water for 3 times, and dried in an oven at 45° C. for 20 h to obtain a micro-arc oxidation conductor;
[0040] (6) 50 parts of polypropylene with a molecular weight of 400,000, 2 parts of antioxidant 618, and 5 parts of modified flame retardant were mixed evenly, melted and extruded at 180° C. to coat the micro-arc oxidation conductor to form an insulating layer with a thickness of 1.5 mm, thereby obtaining an insulated battery cell;
[0041] (7) A shielding layer with a copper wire diameter of 0.15 mm is woven around the outer periphery of the insulating core using a braiding machine, and then styrene-butadiene rubber is extruded around the outer periphery of the shielding layer at 160° C. and naturally cooled to room temperature to obtain a flame-retardant and high-temperature resistant power cable.
[0042] Example 3
[0043] (1) 16 parts of benzene-1,2,3-triamine, 11 parts of formyltrimethylammonium chloride, and 130 parts of ethanol were mixed uniformly, the pH value was adjusted to 9.5 with a 2 mol / L sodium hydroxide aqueous solution, the temperature was raised to 70° C., the mixture was stirred at 100 rpm for 4 hours, and the mixture was allowed to stand and be kept warm for 2 hours to prepare a prepolymer solution;
[0044] (2) 15 parts of ferric nitrate, 16 parts of chromium sulfate and 95 parts of deionized water were mixed uniformly, the temperature was raised to 75°C, and the pH value was adjusted to 10.5 with a 2 mol / L sodium hydroxide aqueous solution under stirring at 110 rpm, and the reaction was carried out for 30 hours. After the reaction was completed, 38 parts of the prepolymer solution was added at a rate of 2 drops / s, and the reaction was continued for 11 hours. The solid was collected by filtration, washed with deionized water 3 times, dried in an oven at 45°C for 24 hours, and ground into a powder with a particle size of 60 nm to obtain a modified flame retardant;
[0045] (3) Set the cross-sectional area to 400mm 2 The copper conductor was cleaned and placed in an ultrasonic shot peening device. A 1 mm stainless steel ball was used as the shot peening medium. The shot peening was performed at a vibration frequency of 22 kHz and an amplitude of 35 μm for 15 min to obtain a shot peened conductor.
[0046] (4) 0.7 parts of ammonium cobalt phosphate, 0.5 parts of 3-aminopropyltriethoxysilane, and 100 parts of deionized water were mixed evenly, and filtered through filter paper to prepare an electrolyte;
[0047] (5) The conductor after shot peening was immersed in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washed with deionized water for 3 times, immersed in a 15 wt % nitric acid aqueous solution for 1 min, washed with deionized water for 3 times, placed in an electrolyte, oxidized for 5 min at a voltage of 350 V, a frequency of 380 Hz, and a pulse width of 90 μs, taken out, washed with deionized water for 3 times, and dried in a 50° C. oven for 24 h to obtain a micro-arc oxidation conductor;
[0048] (6) 55 parts of polypropylene with a molecular weight of 600,000, 3 parts of antioxidant B215, and 7 parts of modified flame retardant were mixed evenly, melted and extruded at 185° C. to coat a micro-arc oxidation conductor to form an insulating layer with a thickness of 2.5 mm, thereby obtaining an insulated battery cell;
[0049] (7) A shielding layer with a copper wire diameter of 0.2 mm is woven on the periphery of the insulating core using a braiding machine, and then styrene-butadiene rubber is extruded on the periphery of the shielding layer at 170° C. and naturally cooled to room temperature to obtain a flame-retardant and high-temperature resistant power cable.
[0050] Comparative Example 1
[0051] The difference between Comparative Example 1 and Example 2 is that there is no step (3), and step (5) is changed to: the cross-sectional area is 200mm 2 The copper conductor was immersed in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washed with deionized water for 3 times, immersed in a 15 wt % nitric acid aqueous solution for 1 min, washed with deionized water for 3 times, placed in an electrolyte, oxidized for 4 min at a voltage of 350 V, a frequency of 380 Hz, and a pulse width of 90 μs, taken out, washed with deionized water for 3 times, and dried in an oven at 45° C. for 20 h to obtain a micro-arc oxidation conductor. The remaining steps are the same as those in Example 2.
[0052] Comparative Example 2
[0053] The difference between Comparative Example 2 and Example 2 is that there are no steps (4) and (5), and step (6) is changed to: 50 parts of polypropylene with a molecular weight of 400000, 2 parts of antioxidant 618, and 5 parts of modified flame retardant are mixed evenly, melted and extruded at 180° C. to coat the shot-peened conductor to form an insulating layer with a thickness of 1.5 mm, and an insulated battery cell is obtained. The remaining steps are the same as those of Example 2.
[0054] Comparative Example 3
[0055] The difference between Comparative Example 3 and Example 2 is that there is no step (2), and step (1) is changed to: 12 parts of benzene-1,2,3-triamine, 8 parts of formylmethyl trimethyl ammonium chloride, and 95 parts of ethanol are mixed evenly, the pH value is adjusted to 9 with a 2 mol / L sodium hydroxide aqueous solution, the temperature is raised to 65°C, stirred at 100 rpm for 3 hours, kept at room temperature for 1.5 hours, and concentrated at a vacuum degree of -0.1 MPa and 35°C for 3 hours to obtain a prepolymer; step (6) is changed to: 50 parts of polypropylene with a molecular weight of 400000, 2 parts of antioxidant 618, and 5 parts of prepolymer are mixed evenly, melt extruded at 180°C to coat a micro-arc oxidation conductor to form an insulating layer with a thickness of 1.5 mm to obtain an insulating battery. The remaining steps are the same as those of Example 2.
[0056] Comparative Example 4
[0057] The difference between Comparative Example 4 and Example 2 is that there is no step (1), and step (2) is changed to: 11 parts of ferric nitrate, 11 parts of chromium sulfate, and 75 parts of deionized water are mixed uniformly, heated to 65°C, and stirred at 110rpm, and the pH value is adjusted to 10 with a 2 mol / L sodium hydroxide aqueous solution, and the reaction is carried out for 22 hours. After the reaction is completed, the solid is collected by filtration, washed with deionized water 3 times, dried in an oven at 40°C for 18 hours, and ground into a powder with a particle size of 45 nm to obtain a modified flame retardant. The remaining steps are the same as those in Example 2.
[0058] Effect example
[0059] Table 1 below shows the performance analysis results of the flame retardant and high temperature resistant power cables of Examples 1 to 3 and Comparative Examples 1 to 4 of the present invention.
[0060] Table 1
[0061]
[0062] From the comparison of the experimental data of Examples 1, 2, and 3 with those of Comparative Example 1, it can be found that by ultrasonic shot peening the surface of the conductor, plastic deformation occurs on the surface of the conductor, and compressive residual stress is generated at the surface position, so that the grains are refined, the phenomenon of cracks caused by excessive shrinkage of crystals at low temperatures is reduced, the obstruction to electron conduction is reduced, and the low-temperature resistance and conductive efficiency of the cable are improved; from the comparison of the experimental data of Examples 1, 2, and 3 with those of Comparative Example 2, it can be found that by using ammonium cobalt phosphate and 3-aminopropyltriethoxysilane as electrolytes and performing micro-arc oxidation treatment, uniformly distributed micron-sized discharge holes with a grid structure similar to a "volcanic cone" can be formed. During the current transmission process, its larger surface area improves the heat dissipation effect, reduces the influence of temperature on resistance, and maintains the stability of current transmission. At the same time, cobalt ions, silicate ions, and phosphate groups are introduced to react with the surface of the conductor to form a ceramic oxide film, which can resist the heat of the conductor in a low temperature environment. It has good stability under low temperature and enhances low temperature resistance; from the comparison of the experimental data of Examples 1, 2, and 3 with Comparative Example 3, it can be found that by co-precipitating ferric nitrate and chromium sulfate to form a layered hydroxide, it has a lower decomposition temperature. When combustion occurs, the decomposition absorbs a large amount of heat and has the function of inhibiting the diffusion of smoke and blocking oxygen. At the same time, when the cable is subjected to shrinkage or external stress caused by low temperature, the layered structure can be used as a stress dispersion center, so that the cable can still maintain good mechanical properties at low temperatures and achieve low temperature resistance; from the comparison of the experimental data of Examples 1, 2, and 3 with Comparative Example 4, it can be found that the prepolymer is mixed and coated on the layered hydroxide, the amorphous region in the polymer is increased, the polymer in the cable is prevented from crystallizing and becoming brittle at low temperatures, and low temperature resistance is achieved, and the molecular skeleton of the polymer contains multiple rigid benzene rings, which improves the stability in a low temperature environment and enhances the low temperature resistance of the cable.
[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.
Claims
1. A method for preparing a flame-retardant and high-temperature resistant power cable, characterized in that: The method comprises the following preparation steps: (1) 7 to 15 parts of ferric nitrate, 6 to 16 parts of chromium sulfate, and 55 to 95 parts of deionized water are mixed uniformly, heated to 55 to 75° C., and stirred at 110 rpm, and the pH value is adjusted to 9.5 to 10.5 with a 2 mol / L sodium hydroxide aqueous solution, and the reaction is carried out for 14 to 30 hours. After the reaction is completed, 20 to 38 parts of the prepolymer solution are added at a rate of 2 drops / s, and the reaction is continued for 5 to 11 hours. The solid is collected by filtration, washed with deionized water for 3 times, dried in an oven at 35 to 45° C. for 12 to 24 hours, and ground into a powder with a particle size of 30 to 60 nm to prepare a modified flame retardant; (2) After cleaning the copper conductor, place it in an ultrasonic shot peening device and use a 1 mm stainless steel ball as the shot peening medium for 5 to 15 minutes to obtain a shot peened conductor; (3) After the conductor is pretreated after shot peening, it is placed in an electrolyte and oxidized for 3 to 5 minutes under the conditions of voltage 350 V, frequency 380 Hz, and pulse width 90 μs. It is taken out and washed with deionized water for 3 times, and placed in an oven at 40 to 50° C. to dry for 16 to 24 hours to obtain a micro-arc oxidation conductor; (4) 45 to 55 parts of polypropylene, 1 to 3 parts of antioxidant, and 3 to 7 parts of modified flame retardant are uniformly mixed, melted and extruded at 175 to 185° C. to coat the micro-arc oxidation conductor to form an insulating layer, thereby obtaining an insulated battery cell; (5) A copper wire shielding layer is braided on the outer periphery of the insulating core by a braiding machine, and then styrene-butadiene rubber is extruded on the outer periphery of the shielding layer at 150-170° C. and naturally cooled to room temperature to obtain a flame-retardant and high-temperature resistant power cable.
2. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The preparation steps of the prepolymer solution in step (1) are as follows: 8 to 16 parts of benzene-1,2,3-triamine, 5 to 11 parts of formyltrimethylammonium chloride, and 60 to 130 parts of ethanol are uniformly mixed, the pH value is adjusted to 8.5 to 9.5 with a 2 mol / L sodium hydroxide aqueous solution, the temperature is raised to 60 to 70° C., stirred at 100 rpm for 2 to 4 hours, and allowed to stand for 1 to 2 hours to obtain a prepolymer solution.
3. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The cross-sectional area of the copper conductor in step (2) is 0.5 to 400 mm 2 .
4. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The parameters of the shot peening equipment in step (2) are a vibration frequency of 16 to 22 kHz and an amplitude of 25 to 35 μm.
5. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The pretreatment step in step (3) is as follows: soaking the shot-peened conductor in a 4 mol / L sodium hydroxide aqueous solution for 1 min, washing it three times with deionized water, and then soaking it in a 15 wt % nitric acid aqueous solution for 1 min, and washing it three times with deionized water.
6. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The preparation steps of the electrolyte in step (3) are as follows: 0.7 parts of ammonium cobalt phosphate, 0.5 parts of 3-aminopropyltriethoxysilane, and 100 parts of deionized water are mixed evenly, and filtered with filter paper to obtain an electrolyte.
7. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The molecular weight of the polypropylene in step (4) is 200,000 to 600,000.
8. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The antioxidant in step (4) is a mixture of any one or more of antioxidant 3114, antioxidant 618, and antioxidant B215.
9. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The thickness of the insulating layer in step (4) is 0.5 to 2.5 mm.
10. The method for preparing a flame-retardant and high-temperature resistant power cable according to claim 1, characterized in that: The copper wire in step (5) has a diameter of 0.1 to 0.2 mm.