An anti-aging insulated flame-retardant power cable

Abstract

The present application relates to a power transmission system, and specifically discloses an anti-aging insulated flame-retardant power cable, comprising a battery core and an insulating layer wrapped around the battery core, wherein the insulating layer is made of the following raw materials in parts by weight: 100 parts of low-density linear polyethylene, 1.2-2.1 parts of a cross-linking agent, 0.3-0.45 parts of an antioxidant, and 15-24 parts of an anti-water treeing filler; the anti-water treeing filler comprises a filler matrix, and the filler matrix is ​​obtained by adding a flux to the surface of an alumina powder and remelting and recrystallizing the surface; the flux is a mixture of calcium silicate, dicalcium silicate, and tricalcium silicate, and the anti-water treeing filler melts and recrystallizes the outer layer of the alumina powder at a temperature lower than the melting temperature of pure alumina, and has low density and lightweight performance, as well as higher strength and water resistance, and prevents holes from becoming channels for water treeing and aging, thereby improving the anti-aging, insulation, and flame retardancy of the cable of the present application.

Description

Technical Field

[0001] The invention relates to a power transmission system, and more particularly to an anti-aging insulated flame-retardant power cable. Background Art

[0002] Power cables are wire products used to transmit electrical energy, information and realize electromagnetic energy conversion. They are made by extruding an insulating layer outside the conductor and then adding a sheath layer. At present, cross-linked polyethylene is used as the insulating layer material in power cables to produce halogen-free flame-retardant cables. With the advantages of cross-linked polyethylene's own light weight, high temperature resistance and wear resistance, it has a good application market in the field of overhead cables.

[0003] However, cross-linked polyethylene also has its own defects. In the rainy season or in a humid environment, cross-linked polyethylene will absorb or adhere to moisture. Under the action of the electric field carried by the power cable, the moisture will gather in the microscopic defects of the insulation layer, forming water trees, which will accelerate the aging of the cable. When excessive voltage invades the cable power system, it will cause the insulation to break down, causing a power outage. Summary of the invention

[0004] In order to solve the problem that cross-linked polyethylene is susceptible to water tree aging and insulation performance weakening, the present invention provides an anti-aging insulated flame-retardant power cable.

[0005] The present application provides an anti-aging insulated flame-retardant power cable, which adopts the following technical solution:

[0006] An anti-aging insulated flame-retardant power cable comprises a battery core and an insulating layer wrapped outside the battery core, wherein the insulating layer is made of the following raw materials in parts by weight: 100 parts of low-density linear polyethylene, 1.2 to 2.1 parts of a cross-linking agent, 0.3 to 0.45 parts of an antioxidant, and 15 to 24 parts of a water-resistant tree filler;

[0007] The water-resistance resin-forming filler comprises a filler matrix, which is obtained by adding flux into the surface of aluminum oxide powder and remelting and recrystallizing the surface; the flux is a mixture of calcium silicate, dicalcium silicate and tricalcium silicate.

[0008] By adopting the above technical solution, the anti-water treeing filler is added with a flux of a mixture of calcium silicate, dicalcium silicate and tricalcium silicate on the surface of the alumina powder particles. The flux has a low melting point and melts first during high-temperature heat treatment to form a eutectic with the outer layer of the alumina powder particles. The outer layer of the alumina powder is melted and recrystallized at a temperature lower than the melting temperature of pure alumina, thereby sealing the surface of the alumina powder. The filler matrix has holes inside and the outer layer is dense and closed, so that the filler matrix has low density and lightweight performance while also having higher strength and water resistance, preventing the holes from becoming channels for water treeing aging, thereby providing the insulation layer with the ability to resist water treeing aging.

[0009] At the same time, the water-resistant tree-forming filler prepared with alumina as raw material also has the ability to improve the insulation and flame retardancy of the insulation layer, thereby improving the anti-aging, insulation and flame retardancy of the cable of the present application.

[0010] Preferably: the method of incorporating the co-solvent is as follows:

[0011] T1: Soak the alumina powder in the calcium salt solution, and after the alumina powder has fully absorbed the solution, filter to obtain the wet alumina powder;

[0012] T2: wet alumina powder is added and dispersed in the sodium silicate solution, and after the reaction is complete, filtering is performed to obtain the plugging alumina powder; T3: the plugging alumina powder is subjected to high-temperature heat treatment in a non-oxidizing atmosphere at a temperature of 500-1000°C, and after dehydration and decomposition are completed, alumina powder doped with flux is obtained.

[0013] By adopting the above technical scheme, calcium ions are first infiltrated into the alumina powder particles, and then silicate ions combine with the calcium ions in the alumina powder particles to be converted into gel or precipitate attached to the alumina powder particles, and then dehydrated at high temperature to be converted into a mixture of calcium silicate, dicalcium silicate and tricalcium silicate.

[0014] The flux thus attached can be mixed more deeply and evenly with the alumina powder, which is beneficial to the formation of a eutectic to promote the melting and recrystallization of the surface of the anti-water-treeing filler, and the flux thus attached is attached to the pores of the alumina powder particles, and is not easy to separate from the alumina powder particles or to aggregate when it melts at a high temperature and no eutectic is formed. Based on this, the desired micron-level particle size and anti-water-treeing filler below the micron-level particle size can be obtained.

[0015] Preferably, the concentration of the sodium silicate solution is 6-10wt%.

[0016] By adopting the above technical solution, the excessively high concentration of silicate will cause the calcium ions on the surface of the alumina powder and the ends of the pores to be quickly converted into calcium silicate, which will then close the pores and hinder the conversion of calcium ions further into the pores. Finally, the flux is not added enough, the melt recrystallization effect is not good, and the anti-water treeing effect of the insulation layer is not improved enough.

[0017] The concentration of silicate is too low, and the time required to convert the calcium ions and seal the pores is too long. The calcium ions in the alumina powder particles diffuse to the outside of the alumina powder particles, and the resulting flux is only attached to the surface of the alumina. It fails to achieve a deeper and more uniform mixing with the alumina powder, and the anti-water treeing effect of the insulating layer is insufficiently improved.

[0018] Preferably, the concentration of the calcium salt solution is 25-30 wt%.

[0019] By adopting the above technical solution, the aluminum oxide powder soaked at this concentration absorbs enough calcium ions, the flux formed by the conversion is sufficient, and the surface of the water-resistant filler is melted and recrystallized densely. Too high a concentration of calcium salt solution is too expensive and can easily close the pores of the aluminum oxide powder particles too quickly, hindering the conversion of calcium ions further into the pores.

[0020] Preferably, the water-resistance-resistant filler is the filler matrix modified with organosilane.

[0021] Preferably, the organosilane modification is epoxy organosilane modification.

[0022] By adopting the above technical solution, the compatibility of the anti-water treeing filler and the cross-linked polyethylene can be improved, which is conducive to the uniform dispersion of the anti-water treeing filler.

[0023] Preferably, the amount of the water-resistant resin filler is 22 to 24 parts.

[0024] By adopting the above technical solution, based on the improved compatibility of anti-water treeing filler and cross-linked polyethylene under epoxy organosilane modification, more anti-water treeing filler can be added while ensuring the normal extrusion of the insulation layer and the compliance of indicators such as hardness and softness, thereby further enhancing the anti-aging ability and insulation properties.

[0025] Preferably, the water-resistant resin filler has a particle size of 10 to 30 μm.

[0026] By adopting the above technical solution, the production process of nano-scale anti-water-treeing fillers is difficult. Based on the significant effects brought by micron-scale anti-water-treeing fillers, it is better to choose micron-scale anti-water-treeing fillers; at the same time, nano-scale fillers have electron holes, which have an activation effect on free radicals in the body, and may reduce the anti-aging performance.

[0027] In summary, the present invention has the following beneficial effects:

[0028] A flux of a mixture of calcium silicate, dicalcium silicate and tricalcium silicate is added to the surface of the water-treeing filler, and the outer layer of the alumina powder is melted and recrystallized at a temperature lower than the melting temperature of pure alumina, thereby sealing the surface of the alumina powder to prevent the holes from becoming channels for water-treeing aging, thereby improving the aging resistance, insulation and flame retardancy of the cable of the present application. DETAILED DESCRIPTION

[0029] Preparation Example 1

[0030] The preparation method of the water-resistant tree-forming filler is as follows:

[0031] T1: 100 kg of alumina powder with a particle size of 10-30 μm was immersed in a 28 wt% calcium chloride solution, and after sufficient stirring until no bubbles were generated, the solution was immersed for another hour, and the wet alumina powder was obtained by filtering;

[0032] T2: Add the wet alumina powder into 8wt% sodium silicate solution and stir to disperse it, stop stirring and let it soak for 1.5h, and filter to obtain the plugging alumina powder;

[0033] T3: The plugging alumina powder is subjected to high temperature heat treatment in a nitrogen atmosphere at a temperature of 720°C for 1.2 hours to obtain a blended powder; wherein the treatment temperature is not less than 500°C to allow free water and crystal water in the plugging alumina powder to escape, and the treatment temperature is not higher than 1000°C to avoid powder sintering and agglomeration. The treatment temperature and treatment time are adjusted according to the amount of a single batch of plugging alumina powder;

[0034] T4: The blended powder is subjected to high temperature heat treatment in a nitrogen atmosphere and nitrogen blowing, the treatment temperature is 1610°C, the treatment time is 45 minutes, and the particle size is sieved after cooling, and 10-30 μm is taken as the filler matrix;

[0035] T5: The filler matrix was immersed in a silane modification liquid and ultrasonically treated for 40 minutes, then taken out and dried to obtain a water-resistance-resistant filler. The silane modification liquid was prepared by mixing a silane coupling agent with isopropanol in a mass ratio of 1:80, and the ultrasonic frequency was 70 kHz.

[0036] The silane coupling agent in Preparation Example 1 is γ-glycidyloxypropyltriethoxysilane (KH-561).

[0037] Preparation Example 2-13

[0038] The process parameters of the preparation method of the water-resistant tree filler are different from those in Preparation Example 1. The specific differences are shown in Table 1 below.

[0039] Table 1. Partial process parameters of preparation examples 1-13 of water-resistant fillers

[0040]

[0041]

[0042] Preparation Example 14

[0043] The anti-water-treeing filler is different from the preparation example 1 in that the filler matrix is ​​not subjected to the surface modification of T5, and the filler matrix obtained by T4 is used as the anti-water-treeing filler.

[0044] Preparation Example 15

[0045] The difference between the water-resistance filler and the preparation example 1 is that the aluminum oxide powder with a particle size of 1 to 5 μm is selected in T1, and the particle size of the filler matrix in T4 is selected to be 1 to 5 μm.

[0046] The research and development process of this application also includes some research plans for anti-water treeing fillers, as shown in the following research examples 1 to 3.

[0047] Study Example 1

[0048] A filler test product, the preparation method of which is as follows:

[0049] After 10-30 μm alumina powder and 0.5-1 μm calcium silicate powder are uniformly mixed in a mass ratio of 10:1, heat treatment is performed under a nitrogen protective atmosphere at a heat treatment temperature of 1550° C. and a treatment time of 45 minutes.

[0050] After cooling, the processed material shows a lot of compaction and agglomeration - the difference between the particle size of calcium silicate and alumina is too large, resulting in uneven mixing of the two. After the calcium silicate melts at high temperature, the salt alumina particles converge and enrich, and then the surrounding alumina powder becomes compacted and agglomerated.

[0051] According to Research Example 1, in the present application, calcium ions are first infiltrated into the alumina powder particles, and then the alumina powder doped with flux is obtained through silicate ion conversion and high-temperature dehydration steps. This allows the flux to be deeply and evenly mixed with the alumina powder, which is beneficial to the formation of a eutectic to promote the surface melting and recrystallization of the water-resistant tree-forming filler. In addition, the attached flux is attached to the pores of the alumina powder particles, and is not easy to separate from the alumina powder particles or to aggregate when it melts at high temperature and no eutectic is formed. Based on this, the desired water-resistant tree-forming filler can be obtained.

[0052] Study 2

[0053] A filler test product, which differs from Preparation Example 1 in that the heat treatment temperature in step T4 is 1850°C.

[0054] In the case of research example 2, the material obtained in step T4 was agglomerated and unusable because the XCaO·SiO2 and the eutectic had too low viscosity at too high a temperature and seeped out of the powder and gathered during the heat treatment. Therefore, the heat treatment temperature in step T4 should not be too high.

[0055] Study 3

[0056] A filler test product, which differs from Preparation Example 1 in that 200±10 nm aluminum oxide powder is selected in step T1.

[0057] Research Example 3 was prepared according to the preparation method. The material obtained in step T4 was sintered and agglomerated in large quantities and could not be used.

[0058] Example 1

[0059] An anti-aging insulated flame-retardant power cable comprises a battery core, an insulating layer and a sheath.

[0060] The battery cell here is one strand, and the nominal cross section is 240mm 2 ;

[0061] The insulation layer is wrapped around the conductor structure, and its nominal thickness is 1.7 mm;

[0062] The sheath is wrapped around the insulation layer, and its nominal thickness is 1.8mm;

[0063] The approximate cable diameter is 26mm.

[0064] The insulating layer is made by melting and mixing the raw materials in a screw extruder, and then extruding them outside the battery core through an extruder. The insulating layer includes the following raw materials by weight:

[0065] 100 parts of low density linear polyethylene;

[0066] 1.5 parts of cross-linking agent;

[0067] Antioxidant 0.42 parts;

[0068] 22 parts of water-resistant filler.

[0069] The low-density linear polyethylene is compounded by Saudi Sabic 318B and American Dow 352E in a mass ratio of 1:0.8.

[0070] The crosslinking agent is trimethylolpropane triacrylate.

[0071] The antioxidant is prepared by compounding antioxidant B215 and antioxidant 1010 in a mass ratio of 1:1.1.

[0072] The water-resistance-resistance filler is obtained from Preparation Example 1.

[0073] Embodiments 2 to 15

[0074] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the source of the anti-water treeing filler is different. The specific differences are shown in Table 2 below.

[0075] Table 2. Partial raw material dosage and parameter table of Examples 1 to 15

[0076]

[0077] Comparative Example 1

[0078] A cable, which is different from the embodiment 1 in that no water-resistant resin filler is added to the raw materials of the insulating layer.

[0079] Comparative Example 2

[0080] A cable, which is different from Example 1 in that the raw material of the insulation layer is replaced by an equal mass of commercially available 10-30 μm alumina powder to replace the water-resistance filling material.

[0081] The cable insulation layers and insulation layer materials obtained in Examples 1 to 15 and Comparative Examples 1 to 2 were tested, and the insulation resistance test was performed according to GB / T17737.1; the insulation resistance test after hydrolysis simulation was performed according to GB / T17737.1 and GB / T2951.21, with the hydrolysis temperature being 60°C and the hydrolysis time being 1440h; and the flame retardant performance test was performed according to UL94. The test results are shown in Table 3 below.

[0082] Table 3. Test results of Examples 1 to 15 and Comparative Examples 1 to 2

[0083]

[0084] From Table 2 and Table 3, it can be seen from the comparison between Examples 1, 3, 4 and Comparative Example 1 that the insulation resistance of the insulation layer of the cable of the present application is higher than that of Comparative Example 1 which does not add anti-water treeing filler, and the insulation resistance attenuation after water treeing is significantly less than that of Comparative Example 1. At the same time, the insulation layer of the cable of the present application has good flame retardant properties.

[0085] At the same time, by comparing Example 1 and Comparative Example 2, it can be known that the water-resistant filler added to the insulating layer of the present application is different from alumina and different from the powder filler obtained by sintering and crushing alumina mixed with calcium silicate. The water-resistant filler of the present application is mixed with a flux of a mixture of calcium silicate, dicalcium silicate and tricalcium silicate on the surface of the alumina powder particles, which has a low melting point. During high-temperature heat treatment, it first melts and forms a eutectic with the outer layer of the alumina powder particles, and the outer layer of the alumina powder is melted and recrystallized at a temperature lower than the melting temperature of pure alumina, thereby sealing the surface of the alumina powder. The filler matrix has holes inside. The outer layer is dense and closed, with lower density and light weight while having higher strength and water resistance, preventing the holes from becoming channels for water treeing aging, thereby providing the insulation layer with the ability to resist water treeing aging and improving the cable's anti-aging ability.

[0086] Comparative Examples 1 to 5, the difference between them is that the concentration of calcium salt used in the preparation process of the water-resistant treeing filler is different. The concentration of calcium salt used in Example 2, Example 3, Example 1, Example 4, and Example 5 increases. As can be seen from Table 3, the insulation resistance of Examples 1, 3, and 4 before and after hydrolysis is better than that of Examples 2 and 5. This is because too low a calcium salt concentration makes the amount of calcium ions available for conversion insufficient, resulting in insufficient flux incorporation, while too high a calcium salt concentration makes calcium silicate generated too quickly and closes the pores of the alumina powder particles too early, resulting in insufficient final flux incorporation. Too high or too low a calcium salt concentration is not conducive to improving the effect of the water-resistant treeing filler, and 25 to 30 wt % is preferably selected.

[0087] Comparing Example 1 with Examples 6 to 9, the difference lies in the different silicate concentrations used in the preparation of the anti-water treeing filler. The silicate concentrations used in Examples 6, 7, 1, 8, and 9 are increased. As can be seen from Table 3, the insulation resistance of Examples 1, 7, and 8 before and after hydrolysis is better than that of Examples 6 and 9. This is because an excessively high silicate concentration will rapidly convert the calcium ions on the surface of the alumina powder and at the ends of the pores into calcium silicate, which will then seal the pores and hinder the conversion of the calcium ions further into the pores, resulting in insufficient flux incorporation. An excessively low silicate concentration will take too long to convert the calcium ions and seal the pores, causing the calcium ions in the alumina powder particles to diffuse outside the alumina powder particles, and the resulting flux will only adhere to the surface of the alumina, failing to achieve deeper and more uniform mixing with the alumina powder. Ultimately, an excessively high or low silicate concentration is not conducive to improving the anti-water treeing effect of the insulating layer, and 6 to 10 wt % is preferred.

[0088] Comparing Example 1 with Examples 10 to 12, the heat treatment temperature of the T4 step of the water-resistant tree-forming fillers used in Examples 10, 11, 1, and 12 increases successively, the insulation resistance before hydrolysis increases successively, and the insulation resistance weakens and decreases after hydrolysis. Therefore, combined with the insulation resistance values ​​before and after hydrolysis of Examples 10 to 12 and Research Example 2, it is better to select 1580 to 1700°C as the heat treatment temperature of the T4 step of the water-resistant tree-forming fillers.

[0089] Comparing Examples 1, 13, and 14, the insulation resistance of Example 1 before hydrolysis is better than that of Example 13, and the insulation resistance of Example 13 before hydrolysis is better than that of Example 14; the insulation resistance attenuation ratio of Example 1 after hydrolysis is less than that of Example 13, and the insulation resistance attenuation ratio of Example 13 after hydrolysis is less than that of Example 14. In the present application, silane modification of the anti-water treeing filler is beneficial to the dispersion of the anti-water treeing filler in the cross-linked polyethylene, providing a synergistic effect of the anti-water treeing filler, and the epoxy silane modification is preferably selected.

[0090] Comparing Example 1 and Example 15, the insulation resistance of Example 1 before hydrolysis is better than that of Example 15, and the insulation resistance attenuation ratio of Example 1 after hydrolysis is less than that of Example 15. At the same time, combined with Research Example 3, it can be seen that the preparation of the nano-scale water-resistant tree filler in the present application is difficult, and the effect is not as good as the micron-scale water-resistant tree filler. Therefore, it is better to select 10-30μm water-resistant tree filler in the present application.

[0091] Example 16

[0092] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the insulating layer includes the following raw materials in parts by weight: 100 parts of low-density linear polyethylene; 1.5 parts of a cross-linking agent; 0.42 parts of an antioxidant; and 15 parts of a water-resistant tree filler.

[0093] Embodiment 17

[0094] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the insulating layer includes the following raw materials in parts by weight: 100 parts of low-density linear polyethylene; 1.5 parts of a cross-linking agent; 0.42 parts of an antioxidant; and 18 parts of a water-resistant tree filler.

[0095] Embodiment 18

[0096] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the insulating layer includes the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.5 parts of a cross-linking agent; 0.42 parts of an antioxidant; and 24 parts of a water-resistant tree filler.

[0097] Embodiment 19

[0098] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the insulating layer includes the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 1.2 parts of a cross-linking agent; 0.58 parts of an antioxidant; and 15 parts of a water-resistant tree filler.

[0099] The low-density linear polyethylene is compounded by Saudi Sabic 318B and American Dow 352E in a mass ratio of 1:1.

[0100] The crosslinking agent is trimethylolpropane triacrylate.

[0101] The antioxidant is prepared by mixing antioxidant B215 and antioxidant 1010 in a mass ratio of 1:1.

[0102] The water-resistance-resistance filler is obtained from Preparation Example 1.

[0103] Embodiment 20

[0104] An anti-aging insulated flame-retardant power cable, which is different from Example 1 in that the insulating layer includes the following raw materials in parts by mass: 100 parts of low-density linear polyethylene; 2.1 parts of a cross-linking agent; 0.58 parts of an antioxidant; and 24 parts of a water-resistant tree filler.

[0105] The low-density linear polyethylene is compounded with Saudi Sabic 318B and American Dow 352E in a mass ratio of 1:1.3.

[0106] The crosslinking agent is trimethylolpropane triacrylate.

[0107] The antioxidant is prepared by compounding antioxidant B215 and antioxidant 1010 in a mass ratio of 1:0.8.

[0108] The water-resistance-resistance filler is obtained from Preparation Example 1.

[0109] The cable insulation layers and insulation layer materials obtained in Examples 16 to 20 were tested, and the test results are shown in Table 4 below.

[0110] Table 4. Test results of Examples 16 to 20

[0111]

[0112]

[0113] It can be seen from Tables 3 and 4 that, by comparing Examples 16 to 18 with Comparative Example 2, the insulation resistance of Examples 16 to 18 is better than that of Comparative Example 2, and the insulation resistance attenuation ratio after hydrolysis is less than that of Comparative Example 2.

[0114] Comparing Examples 16 to 18 with Example 1, the amounts of water-resistant fillers used in Examples 16, 17, 1, and 18 gradually increase, and the insulation resistance attenuation ratio after hydrolysis gradually decreases; when the amount reaches 22 parts by mass, the decreasing trend of the insulation resistance attenuation ratio after hydrolysis slows down, so the amount of hydrolysis-resistant filler used in this application is selected to be 15 to 24 parts, and 22 to 24 parts is preferably selected.

[0115] It can be seen from Table 3 and Table 4 that, compared with Example 19, Example 20 and Comparative Examples 1 to 2, the insulation resistance constant of the insulating layer of Example 19 and Example 20 is better than that of the insulating layer with only alumina filler or no filler added, and the anti-aging performance is better than that of the insulating layer with only alumina filler or no filler added.

[0116] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An anti-aging insulated flame-retardant power cable, It is characterized in that It comprises a battery core and an insulating layer wrapped outside the battery core, wherein the insulating layer is made of the following raw materials in parts by weight: 100 parts of low-density linear polyethylene, 1.2-2.1 parts of a cross-linking agent, and 15-24 parts of a water-resistant tree filler; The water-resistance resin filler has a particle size of 10-30 μm and comprises a filler matrix, which is obtained by adding flux to the surface of aluminum oxide powder and remelting and recrystallizing the surface; the flux is a mixture of calcium silicate, dicalcium silicate and tricalcium silicate.

2. The anti-aging insulated flame-retardant power cable according to claim 1, It is characterized in that The incorporation method of the cosolvent is as follows: T1: Soak the alumina powder in the calcium salt solution, and filter to obtain the wet alumina powder after the alumina powder has fully absorbed the solution; T2: Add wet alumina powder into the sodium silicate solution and disperse it. After the reaction is complete, filter to obtain the plugging alumina powder. T3: The plugging alumina powder is subjected to high-temperature heat treatment in a non-oxidizing atmosphere at a temperature of 500-1000°C. After dehydration and decomposition are completed, alumina powder doped with flux is obtained.

3. The anti-aging insulated flame-retardant power cable according to claim 2, It is characterized in that The concentration of the sodium silicate solution is 6-10wt%.

4. The anti-aging insulated flame-retardant power cable according to claim 3, It is characterized in that The concentration of the calcium salt solution is 25-30wt%.

5. The anti-aging insulated flame-retardant power cable according to claim 1, It is characterized in that The water-resistance-resistant filler is the filler matrix modified by organic silane.

6. The anti-aging insulated flame-retardant power cable according to claim 5, It is characterized in that The organosilane modification is epoxy organosilane modification.

7. The anti-aging insulated flame-retardant power cable according to claim 6, It is characterized in that The amount of the water-resistant resin filler is 22 to 24 parts.

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