Corrosion-resistant insulated power cable

Abstract

The invention relates to the technical field of cables, and provides a corrosion-resistant insulated power cable which comprises a conductor, an insulating layer and a protective sleeve which are arranged from inside to outside. The protective sleeve comprises the following components: a polyolefin elastomer, linear low-density polyethylene, an ethylene-vinyl acetate copolymer, an antioxidant, a lubricant, polyethylene grafted maleic anhydride, a composite additive and a cross-linking agent; the preparation process of the composite additive comprises the following steps: mixing ammonium polyphosphate, ethanol and deionized water, adding ammonia water to adjust the pH value to 10, adding lauryl sodium sulfate, raising the temperature to 40 DEG C, stirring for 10-20 minutes, adding tetraethoxysilane, continuously stirring for 4-5 hours, adding the modifier, raising the temperature to 60 DEG C, stirring for 1-2 hours, washing, filtering and drying to obtain the composite additive. According to the technical scheme, the problem of insufficient flame retardance and corrosion resistance of the power cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a corrosion-resistant insulated power cable. Background Art

[0002] As a key carrier of electrical energy transmission, the performance of power cables directly impacts the safety and reliability of power supply systems. In complex environments (such as chemical, marine, and high-humidity environments), cable sheath materials often face severe challenges such as penetration of corrosive media and fire risks.

[0003] While widely used polyvinyl chloride (PVC) and standard polyethylene (PE) sheaths offer cost advantages, they also have significant drawbacks. PVC, due to its halogen content, releases toxic gases upon combustion, and its plasticizers are easily leached by acidic and alkaline media, leading to sheath embrittlement and cracking. Standard PE sheaths, while halogen-free, have an oxygen index of only 17-19%, making them flammable and exhibiting poor corrosion resistance. After immersion in 20wt% hydrochloric acid for 30 days, they experience a tensile strength loss of up to 30-40%. Halogen-free flame-retardant polyolefins have become a research hotspot in recent years, but conventional flame retardants (such as aluminum hydroxide) require high addition levels to achieve UL94 V-0 rating, severely compromising the material's mechanical properties. Ammonium polyphosphate (APP), while highly flame-retardant, suffers from poor compatibility with polyolefins, prone to aggregation and moisture absorption and hydrolysis, leading to a sharp decline in flame retardancy and corrosion resistance over long-term use. Although existing technologies have attempted to modify APP through silane coupling agents, they are mostly limited to simple physical coating and fail to build a stable chemical bonding interface, resulting in interface peeling of the protective cover in a hot and humid, acid-base alternating environment, and unable to take into account comprehensive performance such as high flame retardancy and strong corrosion resistance.

[0004] Therefore, in order to solve the above problems, the present invention provides a corrosion-resistant insulated power cable. Summary of the Invention

[0005] The present invention provides a corrosion-resistant insulated power cable, which solves the problem of insufficient flame retardancy and corrosion resistance of power cables in the related art.

[0006] The technical solutions of the present invention are as follows: A corrosion-resistant insulated power cable comprises a conductor, an insulating layer, and a protective sheath arranged from the inside out; the protective sheath comprises the following components in parts by weight: 6-8 parts of a polyolefin elastomer, 40-50 parts of linear low-density polyethylene, 15-20 parts of an ethylene-vinyl acetate copolymer, 1-2 parts of an antioxidant, 0.5-1 part of a lubricant, 1-2 parts of polyethylene grafted maleic anhydride, 15-18 parts of a composite additive, and 0.5-0.8 parts of a cross-linking agent; The preparation process of the composite additive comprises the following steps: mixing ammonium polyphosphate, ethanol and deionized water, adding ammonia water to adjust the pH to 10, adding sodium lauryl sulfate, raising the temperature to 40° C., stirring for 10-20 minutes, adding ethyl orthosilicate, continuing stirring for 4-5 hours, adding a modifier, raising the temperature to 60° C., stirring for another 1-2 hours, washing, filtering and drying to obtain the composite additive.

[0007] In the scheme, ammonium polyphosphate (flame retardant component) is first dispersed in ethanol and deionized water, and the pH is adjusted to 10 with ammonia water to form an alkaline environment to promote subsequent hydrolysis and condensation reactions; tetraethyl orthosilicate (TEOS) is hydrolyzed at 40°C to produce silanol (Si-OH), which is condensed to form a network structure. The subsequently added modifier also contains silanol, which can further condense with the silanol produced by TEOS hydrolysis at 60°C to form a more stable Si-O-Si bond, thereby enhancing the cross-linking degree and structural stability of the composite material, so that the final product has both flame retardant properties and mechanical reinforcement properties.

[0008] More optimally, the raw materials of the composite additive include the following components: by weight, 60-70 parts of ammonium polyphosphate, 120-150 parts of ethanol, 60-80 parts of deionized water, 1-2 parts of sodium lauryl sulfate, 15-20 parts of ethyl orthosilicate, and 3-4 parts of a modifier.

[0009] More optimally, the preparation process of the modifier is: S1: Under a protective atmosphere, diphenylurea, dichlorophenylphosphine and aluminum chloride are mixed, stirred evenly, and reacted. After the reaction is completed, the mixture is cooled to room temperature and post-treated to obtain intermediate A; S2: Under a protective atmosphere, p-hydroxybenzaldehyde, triethylamine, and dichloromethane are mixed and stirred evenly, and then intermediate A is slowly added to react. After the reaction is completed, the mixture is washed and the solvent is removed using a rotary evaporator to obtain intermediate B; S3: Under a protective atmosphere, the intermediate B, anhydrous toluene, p-toluenesulfonic acid, and 3A molecular sieves are mixed. During the stirring process, a mixed solution of 3-aminopropyltriethoxysilane and anhydrous toluene is slowly added dropwise to react. After the reaction is completed, the modified agent is obtained by post-treatment.

[0010] In the scheme, under the catalysis of aluminum chloride (Lewis acid), dichlorophenylphosphine undergoes polarization to generate electrophilic species, which then attacks the electron-rich sites on the aromatic ring of diphenylurea, resulting in an electrophilic substitution reaction. The specific reaction process is shown below:

[0011] More optimally, the intermediate A raw material includes the following components: 2-3 parts of diphenyl urea, 3-4 parts of dichlorophenylphosphine, and 0.2-0.3 parts of aluminum chloride, by weight.

[0012] In the scheme, triethylamine acts as a base to react with the phenolic hydroxyl group of p-hydroxybenzaldehyde to generate a phenol oxide anion, which then acts as a nucleophile to react with p-hydroxybenzaldehyde. The specific synthesis process is shown below:

[0013] More optimally, the raw materials of the intermediate B include the following components: 10-12 parts of p-hydroxybenzaldehyde, 1-2 parts of triethylamine, 50-60 parts of dichloromethane, and 12-15 parts of intermediate A, by weight.

[0014] In the scheme, the amino group of 3-aminopropyltriethoxysilane further reacts with the aldehyde group contained in intermediate B to obtain a modifier, the structure of which is shown below:

[0015] More optimally, the raw materials of the modifier include the following components: by weight, 4-5 parts of intermediate B, 200-220 parts of anhydrous toluene, 0.01-0.02 parts of p-toluenesulfonic acid, 10-12 parts of 3A molecular sieve, and 2-3 parts of 3-aminopropyltriethoxysilane.

[0016] More optimally, in step S1, the reaction temperature is 70-80°C and the reaction time is 8-10 hours.

[0017] More optimally, in step S2, the reaction temperature is 25-35°C and the reaction time is 8-10 hours.

[0018] More optimally, in step S3, the reaction temperature is 70-80°C and the reaction time is 5-6 hours.

[0019] Compared with the prior art, the present invention has the following advantages: The present invention modifies the surface of ammonium polyphosphate by co-condensing a modifier with ethyl orthosilicate, effectively improving the material's interfacial compatibility, flame retardancy, and corrosion resistance. The details are as follows: First, in this scheme, 3-aminopropyltriethoxysilane reacts with Intermediate B to generate a modifier structure with active functional groups. This structure combines the flexibility of the organic chain segments with the thermal stability of the inorganic siloxane, not only increasing the interfacial tension between the ammonium polyphosphate and the matrix but also strengthening the binding force between the two through hydrogen bonding. Furthermore, the pre-coating of the ammonium polyphosphate with ethyl orthosilicate enhances its hydrophobicity, making it easier to disperse evenly in the matrix and improving the material's mechanical properties.

[0020] Second, this approach uses ammonium polyphosphate (APP) as its core. Through the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) under alkaline conditions, a continuous and dense silicon-oxygen network (Si-O-Si) is formed on the APP surface. This structure exhibits extremely high chemical stability and extremely low permeability to corrosive media such as water, acid, and alkali, effectively preventing external corrosive factors from directly contacting the APP and the polymer matrix. Furthermore, the silicon-oxygen network tightly coats the APP, avoiding the interfacial defects associated with traditional APP due to its susceptibility to moisture absorption and migration, and reducing the accumulation of channels for corrosive media between the additive and the matrix. Secondly, the modifier plays a key interfacial bridging role in the system. Its molecular structure contains both siloxy groups with excellent compatibility with the silicon-oxygen network (which can be covalently connected to the TEOS hydrolysis product through Si-O-Si bonds), and organic groups such as urea and imine bonds with strong affinity for organic matrices such as polyolefin elastomers and polyethylene. These organic groups can form van der Waals forces with the matrix molecular chains and produce hydrogen bonds or covalent interactions with the polar groups in the polyethylene-grafted maleic anhydride, significantly enhancing the interfacial bonding between the composite additive and the polymer matrix, eliminating the micro-gaps caused by poor interfacial bonding, and blocking the path for corrosive media to penetrate along the interface. 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 embodiments described 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 any creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that the following parts are by weight, and there are no specific restrictions on the purchase sources of all raw materials involved in this invention. Examples include: ethylene-vinyl acetate copolymer, with a vinyl acetate content of 25% by weight; linear low-density polyethylene (MLLDPE) Exxon Mobil 3518CB, purchased from ExxonMobil; polyolefin elastomer, ethylene-octene copolymer, ENGAGE 8137, purchased from Dow Chemical; and 3A molecular sieve purchased from Nantong Runfeng Petrochemical Co., Ltd.

[0023] Example 1 A preparation process of a corrosion-resistant insulated power cable is as follows: Step 1: Mix and extrude the protective cover raw materials to obtain the protective cover; Step 2: Mix and extrude the raw materials for the insulation layer to obtain the insulation layer; Step 3: Wrap the insulating layer and the protective cover on the surface of the copper alloy conductor in sequence to obtain a corrosion-resistant insulated power cable; The protective cover material comprises the following components in parts by weight: 6 parts of polyolefin elastomer, 40 parts of linear low-density polyethylene, 15 parts of ethylene-vinyl acetate copolymer, 1 part of antioxidant (antioxidant 1010), 0.5 parts of lubricant (paraffin), 1 part of polyethylene grafted maleic anhydride, 15 parts of composite additives, and 0.5 parts of cross-linking agent (dicumyl peroxide); The insulating layer material includes the following components in parts by weight: 150 parts high-density polyethylene, 1 part cross-linking agent (dicumyl peroxide), and 1 part antioxidant (antioxidant 1010); The preparation process of the composite additive is as follows: 60 parts of ammonium polyphosphate, 120 parts of ethanol, and 60 parts of deionized water are mixed, ammonia water is added to adjust the pH to 10, and 1 part of sodium lauryl sulfate is added, the temperature is increased to 40°C, and the mixture is stirred for 10 minutes, 15 parts of ethyl orthosilicate is added, and the mixture is stirred for 4 hours, and then 3 parts of a modifier is added, the temperature is increased to 60°C, and the mixture is stirred for another hour, washed, filtered, and dried to obtain the composite additive; Wherein, the preparation process of the modifier is: S1: Under protective atmosphere, 2 parts of diphenylurea, 3 parts of dichlorophenylphosphine, and 0.2 parts of aluminum chloride were mixed, stirred evenly, and reacted at 70°C for 8 hours. After the reaction, the mixture was cooled to room temperature and post-treated to obtain intermediate A; S2: Under a protective atmosphere, 10 parts of p-hydroxybenzaldehyde, 1 part of triethylamine, and 50 parts of dichloromethane were mixed and stirred evenly, and then 12 parts of p-hydroxybenzaldehyde were slowly added. The reaction was carried out at 25°C for 8 hours. After the reaction was completed, the mixture was washed and the solvent was removed using a rotary evaporator to obtain intermediate B; S3: Under a protective atmosphere, intermediate B 4, 180 parts of anhydrous toluene, 0.01 parts of p-toluenesulfonic acid, and 10 parts of 3A molecular sieves were mixed. During the stirring process, a mixed solution of 2 parts of 3-aminopropyltriethoxysilane and 20 parts of anhydrous toluene was slowly added dropwise. The mixture was reacted at 70°C for 5 hours. After the reaction was completed, the modifier was obtained by post-treatment.

[0024] Example 2 A preparation process of a corrosion-resistant insulated power cable is as follows: Step 1: Mix and extrude the protective cover raw materials to obtain the protective cover; Step 2: Mix and extrude the raw materials for the insulation layer to obtain the insulation layer; Step 3: Wrap the insulating layer and the protective cover on the surface of the copper alloy conductor in sequence to obtain a corrosion-resistant insulated power cable; The protective cover material comprises the following components in parts by weight: 8 parts of polyolefin elastomer, 50 parts of linear low-density polyethylene, 20 parts of ethylene-vinyl acetate copolymer, 2 parts of antioxidant (antioxidant 1010), 1 part of lubricant (paraffin), 2 parts of polyethylene grafted maleic anhydride, 18 parts of composite additives, and 0.8 parts of cross-linking agent (dicumyl peroxide); The insulating layer material includes the following components in parts by weight: 200 parts of high-density polyethylene, 5 parts of a cross-linking agent (dicumyl peroxide), and 2 parts of an antioxidant (antioxidant 1010); The preparation process of the composite additive is as follows: 70 parts of ammonium polyphosphate, 150 parts of ethanol, and 80 parts of deionized water are mixed, ammonia water is added to adjust the pH to 10, 2 parts of sodium lauryl sulfate are added, the temperature is raised to 40°C, and stirring is carried out for 20 minutes, 20 parts of ethyl orthosilicate are added, and stirring is continued for 5 hours, and then 4 parts of a modifier are added, and the temperature is raised to 60°C, and stirring is continued for 2 hours, and the composite additive is obtained. Wherein, the preparation process of the modifier is: S1: Under a protective atmosphere, 3 parts of diphenylurea, 4 parts of dichlorophenylphosphine, and 0.3 parts of aluminum chloride were mixed, stirred evenly, and reacted at 80°C for 10 hours. After the reaction, the mixture was cooled to room temperature and post-treated to obtain intermediate A; S2: Under a protective atmosphere, 12 parts of p-hydroxybenzaldehyde, 2 parts of triethylamine, and 60 parts of dichloromethane were mixed and stirred evenly, and then 15 parts of p-hydroxybenzaldehyde were slowly added. The mixture was reacted at 35°C for 10 hours. After the reaction was completed, the mixture was washed and the solvent was removed using a rotary evaporator to obtain intermediate B. S3: Under a protective atmosphere, 5 intermediates B, 190 parts of anhydrous toluene, 0.02 parts of p-toluenesulfonic acid, and 12 parts of 3A molecular sieves were mixed. During the stirring process, a mixed solution of 3 parts of 3-aminopropyltriethoxysilane and 30 parts of anhydrous toluene was slowly added dropwise. The mixture was reacted at 80°C for 6 hours. After the reaction was completed, the modifier was obtained by post-treatment.

[0025] Example 3 A preparation process of a corrosion-resistant insulated power cable is as follows: Step 1: Mix and extrude the protective cover raw materials to obtain the protective cover; Step 2: Mix and extrude the raw materials for the insulation layer to obtain the insulation layer; Step 3: Wrap the insulating layer and the protective cover on the surface of the copper alloy conductor in sequence to obtain a corrosion-resistant insulated power cable; The protective cover material comprises the following components in parts by weight: 7 parts of polyolefin elastomer, 45 parts of linear low-density polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 1.5 parts of antioxidant (antioxidant 1010), 0.8 parts of lubricant (paraffin), 1.5 parts of polyethylene grafted maleic anhydride, 16 parts of composite additives, and 0.6 parts of crosslinking agent (dicumyl peroxide); The insulating layer material includes the following components in parts by weight: 180 parts of high-density polyethylene, 2 parts of a cross-linking agent (dicumyl peroxide), and 1.5 parts of an antioxidant (antioxidant 1010); The preparation process of the composite additive is as follows: 65 parts of ammonium polyphosphate, 135 parts of ethanol, and 70 parts of deionized water are mixed, ammonia water is added to adjust the pH to 10, 1.5 parts of sodium lauryl sulfate are added, the temperature is raised to 40° C., and stirring is carried out for 15 minutes. 17.5 parts of ethyl orthosilicate are added, and stirring is continued for 4.5 hours. Then, 3.5 parts of a modifier are added, and the temperature is raised to 60° C. and stirring is continued for 1.5 hours. The composite additive is obtained by washing, filtering, and drying. Wherein, the preparation process of the modifier is: S1: Under protective atmosphere, 2.5 parts of diphenylurea, 3.5 parts of dichlorophenylphosphine, and 0.25 parts of aluminum chloride were mixed, stirred evenly, and reacted at 75°C for 9 hours. After the reaction, the mixture was cooled to room temperature and post-treated to obtain intermediate A; S2: Under a protective atmosphere, 11 parts of p-hydroxybenzaldehyde, 1.5 parts of triethylamine, and 55 parts of dichloromethane were mixed and stirred evenly, and then 13.5 parts of triethylamine were slowly added. The mixture was reacted at 30°C for 9 hours. After the reaction was completed, the mixture was washed and the solvent was removed using a rotary evaporator to obtain intermediate B; S3: Under a protective atmosphere, 4.5 parts of intermediate B, 185 parts of anhydrous toluene, 0.005 parts of p-toluenesulfonic acid, and 11 parts of 3A molecular sieves were mixed. During the stirring process, a mixed solution of 2.5 parts of 3-aminopropyltriethoxysilane and 25 parts of anhydrous toluene was slowly added dropwise. The mixture was reacted at 75°C for 5.5 hours. After the reaction was completed, the modifier was obtained by post-treatment.

[0026] Comparative Example 1 In this comparative example, no modifier was introduced during the preparation of the composite additive, and the rest was the same as in Example 3, specifically as follows: A preparation process of a corrosion-resistant insulated power cable is as follows: Step 1: Mix and extrude the protective cover raw materials to obtain the protective cover; Step 2: Mix and extrude the raw materials for the insulation layer to obtain the insulation layer; Step 3: Wrap the insulating layer and the protective cover on the surface of the copper alloy conductor in sequence to obtain a corrosion-resistant insulated power cable; The protective cover material comprises the following components in parts by weight: 7 parts of polyolefin elastomer, 45 parts of linear low-density polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 1.5 parts of antioxidant (antioxidant 1010), 0.8 parts of lubricant (paraffin), 1.5 parts of polyethylene grafted maleic anhydride, 16 parts of composite additives, and 0.6 parts of crosslinking agent (dicumyl peroxide); The insulating layer material includes the following components in parts by weight: 180 parts of high-density polyethylene, 2 parts of a cross-linking agent (dicumyl peroxide), and 1.5 parts of an antioxidant (antioxidant 1010); The preparation process of the composite additive is as follows: 65 parts of ammonium polyphosphate, 135 parts of ethanol, and 70 parts of deionized water are mixed, ammonia water is added to adjust the pH to 10, 1.5 parts of sodium lauryl sulfate are added, the temperature is increased to 40°C, stirred for 15 minutes, 17.5 parts of ethyl orthosilicate are added, stirring is continued for 4.5 hours, washing, filtering, and drying to obtain the composite additive.

[0027] Comparative Example 2 In this comparative example, no composite additive is added to the raw material of the protective cover, and the rest is the same as in Example 3, specifically as follows: A preparation process of a corrosion-resistant insulated power cable is as follows: Step 1: Mix and extrude the protective cover raw materials to obtain the protective cover; Step 2: Mix and extrude the raw materials for the insulation layer to obtain the insulation layer; Step 3: Wrap the insulating layer and the protective cover on the surface of the copper alloy conductor in sequence to obtain a corrosion-resistant insulated power cable; The protective cover material includes the following components in parts by weight: 7 parts of polyolefin elastomer, 45 parts of linear low-density polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 1.5 parts of antioxidant (antioxidant 1010), 0.8 parts of lubricant (paraffin), 1.5 parts of polyethylene grafted maleic anhydride, and 0.6 parts of cross-linking agent (dicumyl peroxide); The insulating layer material includes the following components in parts by weight: 180 parts of high-density polyethylene, 2 parts of a cross-linking agent (dicumyl peroxide), and 1.5 parts of an antioxidant (antioxidant 1010); Detection test (1) The tensile strength of the protective sleeves obtained in the embodiment and the comparative example was tested in accordance with the standard GB / T1040.3-2006; (2) According to the standard GB / T2406.3-2022, the protective sleeves obtained in the embodiment and the comparative example were subjected to high temperature tests to determine their oxygen index; (3) The protective sleeves obtained in the examples and comparative examples were immersed in deionized water for 14 days, and the change rate of tensile strength was measured; (4) The protective sleeves obtained in the examples and comparative examples were immersed in 5 wt % hydrochloric acid for 14 days, and the change rate of tensile strength was measured; (5) The protective sleeves obtained in the examples and comparative examples were immersed in 5 wt % sodium hydroxide for 14 days, and the change rate of tensile strength was measured; The obtained data are shown in Table 1: Table 1

[0028] Conclusion: By optimizing the protective sheath components and the composite additive preparation process, the present invention successfully improves the flame retardancy, corrosion resistance, and mechanical properties of power cables. Experimental data show that the protective sheaths of Examples 1-3 significantly outperform Comparative Examples 1 and 2 in terms of tensile strength, oxygen index, and resistance to acid, alkali, and water corrosion. Specifically, the protective sheath of Example 3 achieved a tensile strength of 15.1 MPa and an oxygen index of 39%. After immersion in 5 wt% hydrochloric acid and sodium hydroxide for 14 days, the tensile strength changes were only -1.5% and -1.9%, respectively, demonstrating excellent corrosion resistance. In comparison, the performance of Comparative Examples 1 (without the addition of a modifier) ​​and 2 (without the addition of a composite additive) was significantly reduced, particularly in terms of corrosion resistance and flame retardancy. This demonstrates that the modifier and silica network structure in the composite additive play a key role in improving the material's overall performance, effectively addressing the deficiencies of conventional power cables in flame retardancy and corrosion resistance.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrosion-resistant insulated power cable, characterized in that: The invention comprises a conductor, an insulating layer and a protective sleeve arranged from the inside out; the protective sleeve comprises the following components in parts by weight: 6-8 parts of polyolefin elastomer, 40-50 parts of linear low-density polyethylene, 15-20 parts of ethylene-vinyl acetate copolymer, 1-2 parts of antioxidant, 0.5-1 part of lubricant, 1-2 parts of polyethylene grafted maleic anhydride, 15-18 parts of composite additives and 0.5-0.8 parts of crosslinking agent; The preparation process of the composite additive comprises the following steps: mixing ammonium polyphosphate, ethanol and deionized water, adding ammonia water to adjust the pH to 10, adding sodium lauryl sulfate, raising the temperature to 40° C., stirring for 10-20 minutes, adding ethyl orthosilicate, continuing stirring for 4-5 hours, adding a modifier, raising the temperature to 60° C., stirring for another 1-2 hours, washing, filtering and drying to obtain the composite additive.

2. A corrosion-resistant insulated power cable according to claim 1, characterized in that: The composite additive raw material comprises the following components: by weight, 60-70 parts of ammonium polyphosphate, 120-150 parts of ethanol, 60-80 parts of deionized water, 1-2 parts of sodium lauryl sulfate, 15-20 parts of ethyl orthosilicate, and 3-4 parts of a modifier.

3. The corrosion-resistant insulated power cable according to claim 1, characterized in that: The preparation process of the modifier is: S1: Under a protective atmosphere, diphenylurea, dichlorophenylphosphine and aluminum chloride are mixed, stirred evenly, and reacted. After the reaction is completed, the mixture is cooled to room temperature and post-treated to obtain intermediate A; S2: Under a protective atmosphere, p-hydroxybenzaldehyde, triethylamine, and dichloromethane are mixed and stirred evenly, and then intermediate A is slowly added to react. After the reaction is completed, the mixture is washed and the solvent is removed using a rotary evaporator to obtain intermediate B; S3: Under a protective atmosphere, the intermediate B, anhydrous toluene, p-toluenesulfonic acid, and 3A molecular sieves are mixed. During the stirring process, a mixed solution of 3-aminopropyltriethoxysilane and anhydrous toluene is slowly added dropwise to react. After the reaction is completed, the modified agent is obtained by post-treatment.

4. The corrosion-resistant insulated power cable according to claim 3, characterized in that: The raw materials of the intermediate A include the following components: 2-3 parts of diphenylurea, 3-4 parts of dichlorophenylphosphine, and 0.2-0.3 parts of aluminum chloride, calculated by weight.

5. The corrosion-resistant insulated power cable according to claim 3, characterized in that: The raw materials of the intermediate B include the following components: 10-12 parts of p-hydroxybenzaldehyde, 1-2 parts of triethylamine, 50-60 parts of dichloromethane, and 12-15 parts of intermediate A, by weight.

6. The corrosion-resistant insulated power cable according to claim 3, characterized in that: The raw materials of the modifier include the following components: by weight, 4-5 parts of intermediate B, 200-220 parts of anhydrous toluene, 0.01-0.02 parts of p-toluenesulfonic acid, 10-12 parts of 3A molecular sieve, and 2-3 parts of 3-aminopropyltriethoxysilane.

7. The corrosion-resistant insulated power cable according to claim 3, characterized in that: In step S1, the reaction temperature is 70-80° C. and the reaction time is 8-10 h.

8. The corrosion-resistant insulated power cable according to claim 3, characterized in that: In step S2, the reaction temperature is 25-35° C. and the reaction time is 8-10 h.

9. The corrosion-resistant insulated power cable according to claim 3, characterized in that: In step S3, the reaction temperature is 70-80° C. and the reaction time is 5-6 h.

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