Marine corrosion-resistant waterproof power cable insulating material and preparation method thereof

Abstract

The invention relates to the field of power cable insulating materials, in particular to a marine corrosion-resistant waterproof power cable insulating material and a preparation method thereof, which are used for solving the problem that the stability and reliability of power transmission are affected due to poor corrosion resistance, water resistance and mechanical strength of the traditional cable insulating material. According to the preparation method, through an elaborately designed multi-component formula system, various high-performance components are fused, and the corrosion-resistant main agent and the corrosion-resistant auxiliary agent are added, so that the power cable insulating material has excellent corrosion resistance, water resistance and mechanical performance, long-term stable operation of a marine power cable in a severe marine environment is comprehensively guaranteed, and the service life of the marine power cable is prolonged. The service life of the cable in a severe marine environment is effectively prolonged, and the preparation method is simple in step, easy for industrial large-scale production, good in economic benefit, wide in market application prospect and capable of providing reliable guarantee for stable operation of a marine power system.

Description

Technical Field

[0001] The present invention relates to the field of power cable insulating materials, and particularly to a marine corrosion-resistant and waterproof power cable insulating material and a preparation method thereof. Background Art

[0002] In the field of ship shipping, power cables play a key role in transmitting power and ensuring the normal operation of various ship equipment. However, the marine environment where ships are located is extremely harsh. When ships sail in the ocean, they face a complex and changeable environment of high humidity, high salinity, and strong corrosiveness. The traditional cable insulating materials are not good in terms of corrosion resistance, waterproofness, and mechanical strength. After long-term contact with seawater, they are prone to corrosion and aging, resulting in a sharp decline in performance, affecting the stability and reliability of power transmission, and even possibly causing serious safety accidents such as short circuits and electric leakage, threatening the normal navigation of ships and the safety of personnel's lives and property. Therefore, developing a marine corrosion-resistant and waterproof power cable insulating material and a preparation method thereof is of great significance for improving the reliability and safety of ship power systems. Summary of the Invention

[0003] In order to overcome the above technical problems, the purpose of the present invention is to provide a marine corrosion-resistant and waterproof power cable insulating material and a preparation method thereof, which solves the problem that the traditional cable insulating materials are not good in terms of corrosion resistance, waterproofness, and mechanical strength, affecting the stability and reliability of power transmission.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A marine corrosion-resistant and waterproof power cable insulating material, comprising the following components in parts by weight: 45 - 55 parts of high-density polyethylene, 36 - 44 parts of linear low-density polyethylene, 11 - 19 parts of styrene-butadiene rubber, 23 - 29 parts of ethylene-propylene-diene monomer rubber, 3.2 - 10.6 parts of a main corrosion-resistant agent, 1.1 - 3.5 parts of an auxiliary corrosion-resistant agent, 0.4 - 1.2 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.4 - 0.8 parts of N-phenyl-α-naphthylamine, 0.3 - 0.7 parts of trimethylolpropane trimethacrylate, 0.2 - 0.4 parts of 2-mercaptobenzothiazole, and 1 - 5 parts of calcium stearate; Among them, the main corrosion-resistant agent is prepared by the following steps: Step a1: Add tetraphenylmethane and fuming nitric acid into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 10 - 15 min at a temperature of -10°C and a stirring rate of 300 - 400 r / min. Then, while stirring, gradually add acetic anhydride - acetic acid solution drop by drop, controlling the dropping rate at 1 - 2 drops / s. After the addition is complete, continue to stir and react for 1 - 1.5 h. Then, raise the temperature to 40 - 50°C and continue to stir and react for 1 - 1.5 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with absolute ethanol 2 - 3 times, then place it in a vacuum drying oven and dry it for 2 - 3 h at a temperature of 60 - 65°C. Then, recrystallize with N,N-dimethylformamide to obtain Intermediate 1; Step a2: Add Intermediate 1, 10% palladium carbon and anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and a gas pipe. Introduce nitrogen for protection. Stir and react for 20 - 30 min at a temperature of 25 - 30°C and a stirring rate of 300 - 400 r / min. Then, introduce hydrogen to maintain the reaction pressure at 1.8 - 2.0 MPa and raise the temperature to 40 - 45°C and continue to stir and react for 20 - 30 h. After the reaction is completed, cool the reaction product to room temperature, then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain Intermediate 2; Step a3: Add heptafluorobutyric acid and N,N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 30 - 40 min at a temperature of 25 - 30°C and a stirring rate of 300 - 400 r / min. Then, while stirring, gradually add thionyl chloride drop by drop, controlling the dropping rate at 1 - 2 drops / s. After the addition is complete, raise the temperature to 80 - 85°C and continue to stir and react for 2 - 3 h. After the reaction is completed, cool the reaction product to room temperature, then distill at atmospheric pressure and collect the fraction at a temperature of 39°C to obtain Intermediate 3; Step a4: Add Intermediate 2, triethylamine and dichloromethane into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 30 - 40 min at a temperature of -5 - 0°C and a stirring rate of 300 - 400 r / min. Then, while stirring, gradually add Intermediate 3 - dichloromethane solution drop by drop, controlling the dropping rate at 1 - 2 drops / s. After the addition is complete, raise the temperature to 40 - 45°C and continue to stir and react for 2 - 3 h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, and then recrystallize with anhydrous acetone to obtain the corrosion-resistant main agent.

[0005] As a further scheme of the present invention: The dosage ratio of the tetraphenylmethane, fuming nitric acid and acetic anhydride - acetic acid solution in Step a1 is 10 mmol: 20 - 25 mL: 40 - 50 mL.

[0006] As a further solution of the present invention: the acetic anhydride - acetic acid solution in step a1 is a mixture of acetic anhydride and acetic acid in a volume ratio of 1:5 - 7.

[0007] As a further solution of the present invention: the dosage ratio of intermediate 1, 10% palladium on carbon and anhydrous tetrahydrofuran in step a2 is 1 g: 0.08 - 0.12 g: 80 - 100 mL.

[0008] As a further solution of the present invention: the dosage ratio of heptafluorobutyric acid, N, N - dimethylformamide and thionyl chloride in step a3 is 10 mmol: 0.8 - 1.2 g: 20 - 22 mmol.

[0009] As a further solution of the present invention: the dosage ratio of intermediate 2, triethylamine, dichloromethane and intermediate 3 - dichloromethane solution in step a4 is 10 mmol: 40 - 45 mmol: 70 - 80 mL: 20 - 25 mL.

[0010] As a further solution of the present invention: the intermediate 3 - dichloromethane solution in step a4 is a solution formed by dissolving intermediate 3 in dichloromethane at a ratio of 5 - 7 mmol: 5 mL.

[0011] As a further solution of the present invention: the corrosion - resistant auxiliary agent is prepared by the following steps: Step b1: Add flake graphite, concentrated sulfuric acid and sodium nitrate into a three - necked flask equipped with a stirrer and a thermometer. Stir and react at a temperature of - 1 - 1 °C and a stirring rate of 300 - 400 r / min for 30 - 40 min. Then add potassium permanganate and continue to stir and react for 3 - 4 h. Then raise the temperature to 40 - 45 °C and continue to stir and react for 30 - 40 min. Then add deionized water and raise the temperature to 80 - 85 °C and continue to stir and react for 20 - 30 min. Then add hydrogen peroxide solution and continue to stir and react for 20 - 30 min. After the reaction is completed, cool the reaction product to room temperature, then centrifuge. Wash the precipitate with hydrochloric acid solution and distilled water 3 - 5 times successively. Then place it in a vacuum drying oven and dry at a temperature of 60 - 65 °C for 7 - 8 h to obtain graphene oxide; Step b2: Add graphene oxide and deionized water into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, introduce nitrogen for protection, stir and react for 2 - 3 h under the conditions of a temperature of 25 - 30 °C and a stirring rate of 300 - 400 r / min. Then add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and continue to stir and react for 15 - 20 min under the condition of heating to 40 - 45 °C. Then add octadecylamine and continue to stir and react for 20 - 30 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with absolute ethanol and distilled water 3 - 5 times in sequence, and then place it in a vacuum drying oven and dry it for 4 - 5 h under the condition of a temperature of 60 - 65 °C to obtain the corrosion-resistant auxiliary agent.

[0012] As a further scheme of the present invention: The dosage ratio of the flake graphite, concentrated sulfuric acid, sodium nitrate, potassium permanganate, deionized water and hydrogen peroxide solution in step b1 is 1 g: 25 - 30 mL: 1.1 - 1.5 g: 6 - 8 g: 100 - 120 mL: 15 - 20 mL.

[0013] As a further scheme of the present invention: The mass fraction of the concentrated sulfuric acid in step b1 is 96 - 98%; the mass fraction of the hydrogen peroxide solution is 30 - 35%; the mass fraction of the hydrochloric acid solution is 8 - 10%.

[0014] As a further scheme of the present invention: The dosage ratio of the graphene oxide, deionized water, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and octadecylamine in step b2 is 1 g: 100 - 120 mL: 0.5 - 0.6 g: 1 - 5 g.

[0015] As a further scheme of the present invention: A preparation method of a marine corrosion-resistant and waterproof power cable insulating material includes the following steps: Step 1: Weigh 45 - 55 parts by weight of high-density polyethylene, 36 - 44 parts of linear low-density polyethylene, 11 - 19 parts of styrene-butadiene rubber, 23 - 29 parts of ethylene-propylene-diene monomer rubber, 3.2 - 10.6 parts of corrosion-resistant main agent, 1.1 - 3.5 parts of corrosion-resistant auxiliary agent, 0.4 - 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.4 - 0.8 parts of N-phenyl-α-naphthylamine, 0.3 - 0.7 parts of trimethylolpropane trimethacrylate, 0.2 - 0.4 parts of 2-mercaptobenzothiazole and 1 - 5 parts of calcium stearate, and set aside. Step 2: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene propylene diene monomer rubber, main corrosion-resistant agent, auxiliary corrosion-resistant agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole, and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixture is obtained; Step 3: Add the mixture into a single-screw extruder for melt extrusion. After cooling and pelletizing, a marine corrosion-resistant and waterproof power cable insulating material is obtained.

[0016] Beneficial effects of the present invention: A marine corrosion-resistant and waterproof power cable insulating material and a preparation method thereof according to the present invention. By adding high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene propylene diene monomer rubber, main corrosion-resistant agent, auxiliary corrosion-resistant agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole, and calcium stearate into a high-speed mixer and stir and mix them, a mixture is obtained after mixing evenly. Then, the mixture is added into a single-screw extruder for melt extrusion. After cooling and pelletizing, a marine corrosion-resistant and waterproof power cable insulating material is obtained; through a carefully designed multi-component formula system, this preparation method integrates a variety of high-performance components, and adding the main corrosion-resistant agent and the auxiliary corrosion-resistant agent can endow the power cable insulating material with excellent corrosion resistance, waterproofness, and mechanical properties, comprehensively ensuring the long-term stable operation of marine power cables in harsh marine environments, effectively extending the service life of cables in harsh marine environments. Moreover, this preparation method has simple steps, is easy to industrialize and mass-produce, has good economic benefits, has broad market application prospects, and can provide reliable guarantee for the stable operation of ship power systems.

[0017] In the process of preparing the corrosion-resistant and waterproof insulating material for marine power cables, a corrosion-resistant main agent was first prepared. Tetraphenylmethane was nitrated with fuming nitric acid to introduce nitro groups onto the benzene rings of tetraphenylmethane, obtaining intermediate 1. Then, under the reduction of hydrogen, the nitro groups on intermediate 1 were reduced to amino groups, obtaining intermediate 2. After that, heptafluorobutyric acid was acyl chlorinated with thionyl chloride to convert the carboxyl group into an acyl chloride group, obtaining intermediate 3. Subsequently, intermediate 2 and intermediate 3 reacted, and the acyl chloride group on intermediate 3 reacted with the amino group on intermediate 2 to form an amide group, introducing a large number of C-F bonds, thus obtaining the corrosion-resistant main agent; the molecular structure of this corrosion-resistant main agent contains a large number of benzene rings and C-F bonds. The benzene rings have good stability and are not easily damaged. Fluorine atoms have a strong electronegativity, which can reduce its surface energy, showing good hydrophobicity, endowing the insulating material for marine power cables with excellent corrosion resistance and waterproofness, and being able to effectively prevent the penetration of seawater and the corrosion of oxygen, thereby achieving efficient protection of the inside of the cable and ensuring the stable and reliable operation of the cable in a humid and highly saline ship environment; In the process of preparing the corrosion-resistant and waterproof insulating material for marine power cables, a corrosion-resistant auxiliary agent was also prepared. Graphene oxide was prepared using flake graphite as the raw material. Then, the carboxyl group on graphene oxide reacted with the amino group on octadecylamine to introduce a large number of alkyl long chains on the surface of graphene oxide, obtaining the corrosion-resistant auxiliary agent; the two-dimensional structure of graphene endows it with an extremely high specific surface area, enabling it to form a dense protective layer. This protective layer can effectively block the erosion of corrosive media in seawater, thereby preventing the occurrence of corrosion reactions. Moreover, graphene has extremely high mechanical strength, which can increase the mechanical strength of the cable. And after introducing a large number of alkyl long chains, its compatibility with the insulating material for marine power cables can be improved, maximizing its ability to enhance the mechanical strength of the insulating material for marine power cables, making the insulating material for marine power cables have excellent corrosion resistance and mechanical properties. Specific Embodiments

[0018] The following will combine 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 a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0019] Example 1: This example is a preparation method of a corrosion-resistant and waterproof insulating material for marine power cables, including the following steps: Step S1: Add 10 mmol of tetraphenylmethane and 20 mL of fuming nitric acid into a three-necked flask equipped with a stirrer, a thermometer, and a constant-pressure dropping funnel. Stir and react for 10 min at a temperature of -10 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add dropwise a solution of acetic anhydride and acetic acid mixed in a volume ratio of 1:5, with a dropping rate of 1 drop / s. After the addition is complete, continue to stir and react for 1 h. Then, raise the temperature to 40 °C and continue to stir and react for 1 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate twice with absolute ethanol, and then place it in a vacuum drying oven and dry it at a temperature of 60 °C for 2 h. Then, recrystallize it with N,N-dimethylformamide to obtain Intermediate 1; Step S2: Add 1 g of Intermediate 1, 0.08 g of 10% palladium on carbon, and 80 mL of anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection and stir and react for 20 min at a temperature of 25 °C and a stirring rate of 300 r / min. Then, introduce hydrogen to maintain the reaction pressure at 1.8 MPa and raise the temperature to 40 °C and continue to stir and react for 20 h. After the reaction is completed, cool the reaction product to room temperature, then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain Intermediate 2; Step S3: Add 10 mmol of heptafluorobutyric acid and 0.8 g of N,N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer, and a constant-pressure dropping funnel. Stir and react for 30 min at a temperature of 25 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add dropwise 20 mmol of thionyl chloride, with a dropping rate of 1 drop / s. After the addition is complete, raise the temperature to 80 °C and continue to stir and react for 2 h. After the reaction is completed, cool the reaction product to room temperature, then distill it under normal pressure and collect the fraction at a temperature of 39 °C to obtain Intermediate 3; Step S4: Add 10 mmol of Intermediate 2, 40 mmol of triethylamine, and 70 mL of dichloromethane into a three-necked flask equipped with a stirrer, a thermometer, and a constant-pressure dropping funnel. Stir and react for 30 min at a temperature of -5 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add dropwise 20 mL of a solution of Intermediate 3 dissolved in dichloromethane at a ratio of 5 mmol:5 mL, with a dropping rate of 1 drop / s. After the addition is complete, raise the temperature to 40 °C and continue to stir and react for 2 h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, and then recrystallize it with anhydrous acetone to obtain the corrosion-resistant main agent; Step S5: Add 1 g of flake graphite, 25 mL of concentrated sulfuric acid with a mass fraction of 96%, and 1.1 g of sodium nitrate into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 30 min at a temperature of -1 °C and a stirring rate of 300 r / min. Then add 6 g of potassium permanganate and continue to stir and react for 3 h. After that, raise the temperature to 40 °C and continue to stir and react for 30 min. Then add 100 mL of deionized water and raise the temperature to 80 °C and continue to stir and react for 20 min. Then add 15 mL of hydrogen peroxide solution with a mass fraction of 30% and continue to stir and react for 20 min. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with hydrochloric acid solution with a mass fraction of 8% and distilled water three times in sequence, and then place it in a vacuum drying oven and dry at a temperature of 60 °C for 7 h to obtain graphene oxide; Step S6: Add 1 g of graphene oxide and 100 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube. Introduce nitrogen for protection and stir and react for 2 h at a temperature of 25 °C and a stirring rate of 300 r / min. Then add 0.5 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and raise the temperature to 40 °C and continue to stir and react for 15 min. Then add 1 g of octadecylamine and continue to stir and react for 20 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with absolute ethanol and distilled water three times in sequence, and then place it in a vacuum drying oven and dry at a temperature of 60 °C for 4 h to obtain the corrosion-resistant auxiliary agent; Step S7: Weigh 45 parts of high-density polyethylene, 36 parts of linear low-density polyethylene, 11 parts of styrene-butadiene rubber, 23 parts of ethylene-propylene-diene monomer rubber, 3.2 parts of corrosion-resistant main agent, 1.1 parts of corrosion-resistant auxiliary agent, 0.4 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.4 part of N-phenyl-α-naphthylamine, 0.3 part of trimethylolpropane trimethacrylate, 0.2 part of 2-mercaptobenzothiazole and 1 part of calcium stearate according to weight parts for standby; Step S8: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, corrosion-resistant main agent, corrosion-resistant auxiliary agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S9: Add the mixed material into a single-screw extruder for melt extrusion. After cooling and pelletizing, a marine corrosion-resistant and waterproof power cable insulating material is obtained.

[0020] Example 2: This embodiment is a preparation method of a marine corrosion-resistant and waterproof power cable insulating material, comprising the following steps: Step S1: Add 10 mmol of tetraphenylmethane and 22 mL of fuming nitric acid into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 12 min at a temperature of -10 °C and a stirring rate of 350 r / min. Then, while stirring, gradually dropwise add an acetic anhydride-acetic acid solution formed by mixing 45 mL of acetic anhydride and acetic acid in a volume ratio of 1:6, control the dropping rate to be 1 drop / s. After the dropping is completed, continue to stir and react for 1.2 h. Then, continue to stir and react for 1.2 h under the condition of heating to 45 °C. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with anhydrous ethanol twice, then place it in a vacuum drying oven and dry it for 2.5 h at a temperature of 62 °C. Then, recrystallize with N,N-dimethylformamide to obtain intermediate 1; Step S2: Add 1 g of intermediate 1, 0.1 g of 10% palladium-carbon and 90 mL of anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and a gas pipe. Introduce nitrogen for protection, stir and react for 25 min at a temperature of 28 °C and a stirring rate of 350 r / min. Then, introduce hydrogen to maintain the reaction pressure at 1.9 MPa and continue to stir and react for 25 h under the condition of heating to 42 °C. After the reaction is completed, cool the reaction product to room temperature, then carry out vacuum filtration, and rotary evaporate the filtrate to remove the solvent to obtain intermediate 2; Step S3: Add 10 mmol of heptafluorobutyric acid and 1 g of N,N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 35 min at a temperature of 28 °C and a stirring rate of 350 r / min. Then, while stirring, gradually dropwise add 21 mmol of thionyl chloride, control the dropping rate to be 1 drop / s. After the dropping is completed, continue to stir and react for 2.5 h under the condition of heating to 82 °C. After the reaction is completed, cool the reaction product to room temperature, then carry out atmospheric distillation, and collect the fraction at a temperature of 39 °C to obtain intermediate 3; Step S4: Add 10 mmol of intermediate 2, 42 mmol of triethylamine and 75 mL of dichloromethane into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 35 min at a temperature of -3 °C and a stirring rate of 350 r / min. Then, while stirring, gradually dropwise add 22 mL of an intermediate 3-dichloromethane solution formed by dissolving intermediate 3 in dichloromethane at a ratio of 6 mmol:5 mL, control the dropping rate to be 1 drop / s. After the dropping is completed, continue to stir and react for 2.5 h under the condition of heating to 42 °C. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, and then recrystallize with anhydrous acetone to obtain the corrosion-resistant main agent; Step S5: Add 1 g of flake graphite, 28 mL of concentrated sulfuric acid with a mass fraction of 97%, and 1.3 g of sodium nitrate into a three-necked flask equipped with a stirrer and a thermometer. Stir and react at a temperature of 0 °C and a stirring rate of 350 r / min for 35 min. Then add 7 g of potassium permanganate and continue to stir and react for 3.5 h. Then raise the temperature to 42 °C and continue to stir and react for 35 min. Then add 110 mL of deionized water and raise the temperature to 82 °C and continue to stir and react for 25 min. Then add 18 mL of hydrogen peroxide solution with a mass fraction of 32% and continue to stir and react for 25 min. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate successively with hydrochloric acid solution with a mass fraction of 9% and distilled water 4 times, and then place it in a vacuum drying oven and dry at a temperature of 62 °C for 7.5 h to obtain graphene oxide; Step S6: Add 1 g of graphene oxide and 110 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube. Introduce nitrogen for protection and stir and react at a temperature of 28 °C and a stirring rate of 350 r / min for 2.5 h. Then add 0.55 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and raise the temperature to 42 °C and continue to stir and react for 18 min. Then add 3 g of octadecylamine and continue to stir and react for 25 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate successively with absolute ethanol and distilled water 4 times, and then place it in a vacuum drying oven and dry at a temperature of 62 °C for 4.5 h to obtain the corrosion-resistant auxiliary agent; Step S7: Weigh 50 parts of high-density polyethylene, 40 parts of linear low-density polyethylene, 15 parts of styrene-butadiene rubber, 26 parts of ethylene-propylene-diene monomer rubber, 6.9 parts of corrosion-resistant main agent, 2.3 parts of corrosion-resistant auxiliary agent, 0.8 part of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.6 part of N-phenyl-α-naphthylamine, 0.5 part of trimethylolpropane trimethacrylate, 0.3 part of 2-mercaptobenzothiazole and 3 parts of calcium stearate according to weight parts for standby; Step S8: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, corrosion-resistant main agent, corrosion-resistant auxiliary agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S9: Add the mixed material into a single-screw extruder for melt extrusion, and obtain the insulating material for marine corrosion-resistant and waterproof power cables after cooling and pelletizing.

[0021] Example 3: This embodiment is a preparation method of a marine corrosion-resistant and waterproof power cable insulating material, comprising the following steps: Step S1: Add 10 mmol of tetraphenylmethane and 25 mL of fuming nitric acid into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 15 min under the conditions of a temperature of -10°C and a stirring rate of 400 r / min. Then, while stirring, gradually dropwise add a solution of acetic anhydride - acetic acid mixed in a volume ratio of 1:7 of 50 mL. Control the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 1.5 h. Then, raise the temperature to 50°C and continue to stir and react for 1.5 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with anhydrous ethanol 3 times, then place it in a vacuum drying oven and dry it for 3 h under the condition of a temperature of 65°C. Then, recrystallize with N,N-dimethylformamide to obtain Intermediate 1; Step S2: Add 1 g of Intermediate 1, 0.12 g of 10% palladium-carbon and 100 mL of anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube. Introduce nitrogen for protection. Stir and react for 30 min under the conditions of a temperature of 30°C and a stirring rate of 400 r / min. Then, introduce hydrogen to maintain the reaction pressure at 2.0 MPa and raise the temperature to 45°C and continue to stir and react for 30 h. After the reaction is completed, cool the reaction product to room temperature, then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain Intermediate 2; Step S3: Add 10 mmol of heptafluorobutyric acid and 1.2 g of N,N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 40 min under the conditions of a temperature of 30°C and a stirring rate of 400 r / min. Then, while stirring, gradually dropwise add 22 mmol of thionyl chloride. Control the dropping rate at 2 drops / s. After the dropping is completed, raise the temperature to 85°C and continue to stir and react for 3 h. After the reaction is completed, cool the reaction product to room temperature, then distill at atmospheric pressure and collect the fraction at a temperature of 39°C to obtain Intermediate 3; Step S4: Add 10 mmol of Intermediate 2, 45 mmol of triethylamine and 80 mL of dichloromethane into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 40 min under the conditions of a temperature of 0°C and a stirring rate of 400 r / min. Then, while stirring, gradually dropwise add 25 mL of a solution of Intermediate 3 dissolved in dichloromethane in a ratio of 7 mmol:5 mL. Control the dropping rate at 2 drops / s. After the dropping is completed, raise the temperature to 45°C and continue to stir and react for 3 h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, and then recrystallize with anhydrous acetone to obtain the corrosion-resistant main agent; Step S5: Add 1 g of flake graphite, 30 mL of concentrated sulfuric acid with a mass fraction of 98%, and 1.5 g of sodium nitrate into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 40 min under the conditions of a temperature of 1 °C and a stirring rate of 400 r / min. Then add 8 g of potassium permanganate and continue to stir and react for 4 h. After that, raise the temperature to 45 °C and continue to stir and react for 40 min. Then add 120 mL of deionized water and raise the temperature to 85 °C and continue to stir and react for 30 min. Then add 20 mL of hydrogen peroxide solution with a mass fraction of 35% and continue to stir and react for 30 min. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with a hydrochloric acid solution with a mass fraction of 10% and distilled water 5 times in sequence, and then place it in a vacuum drying oven and dry it at a temperature of 65 °C for 8 h to obtain graphene oxide; Step S6: Add 1 g of graphene oxide and 120 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube. Introduce nitrogen for protection and stir and react for 3 h under the conditions of a temperature of 30 °C and a stirring rate of 400 r / min. Then add 0.6 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and raise the temperature to 45 °C and continue to stir and react for 20 min. Then add 5 g of octadecylamine and continue to stir and react for 30 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with absolute ethanol and distilled water 5 times in sequence, and then place it in a vacuum drying oven and dry it at a temperature of 65 °C for 5 h to obtain the corrosion-resistant auxiliary agent; Step S7: Weigh 55 parts of high-density polyethylene, 44 parts of linear low-density polyethylene, 19 parts of styrene-butadiene rubber, 29 parts of ethylene-propylene-diene monomer rubber, 10.6 parts of corrosion-resistant main agent, 3.5 parts of corrosion-resistant auxiliary agent, 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.8 part of N-phenyl-α-naphthylamine, 0.7 part of trimethylolpropane trimethacrylate, 0.4 part of 2-mercaptobenzothiazole and 5 parts of calcium stearate according to weight parts for standby; Step S8: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, corrosion-resistant main agent, corrosion-resistant auxiliary agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S9: Add the mixed material into a single-screw extruder for melt extrusion, and obtain the insulating material for marine corrosion-resistant and waterproof power cables after cooling and pelletizing.

[0022] Comparative Example 1: This comparative example is a preparation method of a marine corrosion-resistant and waterproof power cable insulating material, including the following steps: Step S1: Weigh 55 parts by weight of high-density polyethylene, 44 parts of linear low-density polyethylene, 19 parts of styrene-butadiene rubber, 29 parts of ethylene-propylene-diene monomer rubber, 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.8 part of N-phenyl-α-naphthylamine, 0.7 part of trimethylolpropane trimethacrylate, 0.4 part of 2-mercaptobenzothiazole, and 5 parts of calcium stearate, and set aside; Step S2: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole, and calcium stearate to a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S3: Add the mixed material to a single-screw extruder for melt extrusion. After cooling and pelletizing, a marine corrosion-resistant and waterproof power cable insulating material is obtained.

[0023] Comparative Example 2: This comparative example is a preparation method of a marine corrosion-resistant and waterproof power cable insulating material, including the following steps: Step S1: Add 10 mmol of tetraphenylmethane and 25 mL of fuming nitric acid to a three-necked flask equipped with a stirrer, a thermometer, and a constant-pressure dropping funnel. Stir and react for 15 min at a temperature of -10 °C and a stirring rate of 400 r / min. Then, while stirring, gradually dropwise add an acetic anhydride-acetic acid solution prepared by mixing 50 mL of acetic anhydride and acetic acid in a volume ratio of 1:7, control the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 1.5 h. Then, continue to stir and react for 1.5 h under the condition of raising the temperature to 50 °C. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with anhydrous ethanol 3 times, then place it in a vacuum drying oven and dry it for 3 h at a temperature of 65 °C. Then, recrystallize with N,N-dimethylformamide to obtain Intermediate 1; Step S2: Add 1 g of Intermediate 1, 0.12 g of 10% palladium-carbon, and 100 mL of anhydrous tetrahydrofuran to a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube. Introduce nitrogen for protection. Stir and react for 30 min at a temperature of 30 °C and a stirring rate of 400 r / min. Then, introduce hydrogen to maintain the reaction pressure at 2.0 MPa and raise the temperature to 45 °C and continue to stir and react for 30 h. After the reaction is completed, cool the reaction product to room temperature, then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain Intermediate 2; Step S3: Add 10 mmol of heptafluorobutyric acid and 1.2 g of N,N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 40 min at a temperature of 30 °C and a stirring rate of 400 r / min. Then, while stirring, gradually add 22 mmol of thionyl chloride dropwise, controlling the dropping rate at 2 drops / s. After the addition is complete, continue to stir and react at 85 °C for 3 h. After the reaction is completed, cool the reaction product to room temperature, and then perform atmospheric distillation to collect the fraction with a temperature of 39 °C to obtain Intermediate 3; Step S4: Add 10 mmol of Intermediate 2, 45 mmol of triethylamine and 80 mL of dichloromethane into a three-necked flask equipped with a stirrer, a thermometer and a constant-pressure dropping funnel. Stir and react for 40 min at a temperature of 0 °C and a stirring rate of 400 r / min. Then, while stirring, gradually add 25 mL of an Intermediate 3-dichloromethane solution formed by dissolving 7 mmol of Intermediate 3 in 5 mL of dichloromethane dropwise, controlling the dropping rate at 2 drops / s. After the addition is complete, continue to stir and react at 45 °C for 3 h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, and then recrystallize with anhydrous acetone to obtain the main anti-corrosion agent; Step S5: Weigh 55 parts by weight of high-density polyethylene, 44 parts of linear low-density polyethylene, 19 parts of styrene-butadiene rubber, 29 parts of ethylene-propylene-diene monomer rubber, 10.6 parts of the main anti-corrosion agent, 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.8 part of N-phenyl-α-naphthylamine, 0.7 part of trimethylolpropane trimethacrylate, 0.4 part of 2-mercaptobenzothiazole and 5 parts of calcium stearate, and set aside; Step S6: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, the main anti-corrosion agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S7: Add the mixed material into a single-screw extruder for melt extrusion, and obtain the marine corrosion-resistant and waterproof power cable insulating material after cooling and pelletizing.

[0024] Comparative Example 3: This comparative example is a preparation method of a marine corrosion-resistant and waterproof power cable insulating material, including the following steps: Step S1: Add 1 g of flake graphite, 30 mL of concentrated sulfuric acid with a mass fraction of 98%, and 1.5 g of sodium nitrate into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 40 min at a temperature of 1 °C and a stirring rate of 400 r / min. Then add 8 g of potassium permanganate and continue to stir and react for 4 h. Then raise the temperature to 45 °C and continue to stir and react for 40 min. Then add 120 mL of deionized water and raise the temperature to 85 °C and continue to stir and react for 30 min. Then add 20 mL of hydrogen peroxide solution with a mass fraction of 35% and continue to stir and react for 30 min. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with 10% hydrochloric acid solution and distilled water 5 times in sequence, and then place it in a vacuum drying oven and dry for 8 h at a temperature of 65 °C to obtain graphene oxide; Step S2: Add 1 g of graphene oxide and 120 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube. Introduce nitrogen for protection and stir and react for 3 h at a temperature of 30 °C and a stirring rate of 400 r / min. Then add 0.6 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and raise the temperature to 45 °C and continue to stir and react for 20 min. Then add 5 g of octadecylamine and continue to stir and react for 30 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with absolute ethanol and distilled water 5 times in sequence, and then place it in a vacuum drying oven and dry for 5 h at a temperature of 65 °C to obtain a corrosion-resistant auxiliary agent; Step S3: Weigh 55 parts of high-density polyethylene, 44 parts of linear low-density polyethylene, 19 parts of styrene-butadiene rubber, 29 parts of ethylene-propylene-diene monomer rubber, 3.5 parts of corrosion-resistant auxiliary agent, 1.2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.8 part of N-phenyl-α-naphthylamine, 0.7 part of trimethylolpropane trimethacrylate, 0.4 part of 2-mercaptobenzothiazole and 5 parts of calcium stearate according to weight parts for standby; Step S4: Add high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, corrosion-resistant auxiliary agent, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step S5: Add the mixed material into a single-screw extruder for melt extrusion. After cooling and pelletizing, a marine corrosion-resistant and waterproof power cable insulating material is obtained.

[0025] Perform performance tests on the marine corrosion-resistant and waterproof power cable insulating materials of Examples 1-3 and Comparative Examples 1-3. The test results are shown in the following table;

[0026] Referring to the data in the above table, by comparing Examples 1-3 and Comparative Examples 1-3, it can be known that the marine corrosion-resistant and waterproof power cable insulating material of the present application has excellent corrosion resistance and waterproof performance.

[0027] Among them, the water absorption rate is to make a 20×20 mm square specimen from 5 g of the marine corrosion-resistant and waterproof power cable insulating material, soak it in a 3.5% sodium chloride solution for 48 h, and test its water absorption rate; The acid corrosion resistance is to make a 20×20 mm square specimen from 5 g of the marine corrosion-resistant and waterproof power cable insulating material, soak it in a 10% hydrochloric acid solution for 48 h, observe the surface corrosion situation, and test its tensile strength retention rate; The alkali corrosion resistance is to make a 20×20 mm square specimen from 5 g of the marine corrosion-resistant and waterproof power cable insulating material, soak it in a 10% sodium hydroxide solution for 48 h, observe the surface corrosion situation, and test its tensile strength retention rate.

[0028] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The above content is only an example and illustration of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the invention or exceed the scope defined by this application, they should all fall within the protection scope of the present invention.

Claims

1. A marine corrosion-resistant and waterproof power cable insulating material, characterized in that, Comprising the following components in parts by weight: 45 - 55 parts of high - density polyethylene, 36 - 44 parts of linear low - density polyethylene, 11 - 19 parts of styrene - butadiene rubber, 23 - 29 parts of ethylene - propylene - diene monomer, 3.2 - 10.6 parts of main corrosion - resistant agent, 1.1 - 3.5 parts of auxiliary corrosion - resistant agent, 0.4 - 1.2 parts of pentaerythritol tetra[β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionate], 0.4 - 0.8 parts of N - phenyl - α - naphthylamine, 0.3 - 0.7 parts of trimethylolpropane trimethacrylate, 0.2 - 0.4 parts of 2 - mercaptobenzothiazole, and 1 - 5 parts of calcium stearate; Among them, the main corrosion - resistant agent is prepared by the following steps: Step a1: Stir and react tetraphenylmethane and fuming nitric acid, then dropwise add acetic anhydride - acetic acid solution drop by drop while stirring. After the addition is complete, continue stirring and reacting. After the reaction is completed, cool the reaction product, then centrifuge, wash, dry, and recrystallize the precipitate to obtain intermediate 1; Step a2: Stir and react intermediate 1, 10% palladium - carbon, and anhydrous tetrahydrofuran, then introduce hydrogen and continue stirring and reacting. After the reaction is completed, cool the reaction product, then vacuum filter, and rotary evaporate the filtrate to obtain intermediate 2; Step a3: Stir and react heptafluorobutyric acid and N,N - dimethylformamide, then dropwise add thionyl chloride drop by drop while stirring. After the addition is complete, continue stirring and reacting. After the reaction is completed, cool the reaction product, then distill at atmospheric pressure and collect the distillate to obtain intermediate 3; Step a4: Stir and react intermediate 2, triethylamine, and dichloromethane, then dropwise add intermediate 3 - dichloromethane solution drop by drop while stirring. After the addition is complete, continue stirring and reacting. After the reaction is completed, cool the reaction product, then rotary evaporate and recrystallize to obtain the main corrosion - resistant agent.

2. The marine corrosion-resistant and waterproof power cable insulating material according to claim 1, wherein The dosage ratio of the tetraphenylmethane, fuming nitric acid, and acetic anhydride - acetic acid solution in step a1 is 10 mmol:20 - 25 mL:40 - 50 mL; the acetic anhydride - acetic acid solution is a mixture of acetic anhydride and acetic acid in a volume ratio of 1:5 - 7.

3. A marine corrosion-resistant and waterproof power cable insulating material according to claim 1, characterized in that, The dosage ratio of intermediate 1, 10% palladium - carbon, and anhydrous tetrahydrofuran in step a2 is 1 g:0.08 - 0.12 g:80 - 100 mL.

4. The marine corrosion-resistant and waterproof power cable insulating material according to claim 1, characterized in that, The dosage ratio of heptafluorobutyric acid, N,N - dimethylformamide, and thionyl chloride in step a3 is 10 mmol:0.8 - 1.2 g:20 - 22 mmol.

5. The marine corrosion-resistant and waterproof power cable insulating material according to claim 1, characterized in that The dosage ratio of intermediate 2, triethylamine, dichloromethane, and intermediate 3 - dichloromethane solution in step a4 is 10 mmol:40 - 45 mmol:70 - 80 mL:20 - 25 mL; the intermediate 3 - dichloromethane solution is a solution formed by dissolving intermediate 3 at 5 - 7 mmol:5 mL in dichloromethane.

6. The marine corrosion-resistant and waterproof power cable insulating material according to claim 1, characterized in that, The auxiliary corrosion - resistant agent is prepared by the following steps: Step b1: Stir and react flake graphite, concentrated sulfuric acid, and sodium nitrate, then successively add potassium permanganate, deionized water, and hydrogen peroxide solution and continue stirring and reacting. After the reaction is completed, cool the reaction product, then centrifuge, wash, and dry the precipitate to obtain graphene oxide; Step b2: Stir and react graphene oxide and deionized water, then successively add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and octadecylamine and continue to stir and react. After the reaction is completed, cool the reaction product, then centrifuge, wash and dry the precipitate to obtain the corrosion-resistant auxiliary agent.

7. The marine corrosion-resistant and waterproof power cable insulating material according to claim 6, characterized in that, The dosage ratio of the flake graphite, concentrated sulfuric acid, sodium nitrate, potassium permanganate, deionized water and hydrogen peroxide solution in step b1 is 1 g: 25-30 mL: 1.1-1.5 g: 6-8 g: 100-120 mL: 15-20 mL; the mass fraction of the concentrated sulfuric acid is 96-98%; the mass fraction of the hydrogen peroxide solution is 30-35%.

8. The insulating material for a marine corrosion-resistant and waterproof power cable according to claim 6, characterized in that, The dosage ratio of the graphene oxide, deionized water, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and octadecylamine in step b2 is 1 g: 100-120 mL: 0.5-0.6 g: 1-5 g.

9. A preparation method of a corrosion-resistant and waterproof insulating material for marine power cables, characterized in that, It includes the following steps: Step 1: Weigh 45-55 parts by weight of high-density polyethylene, 36-44 parts of linear low-density polyethylene, 11-19 parts of styrene-butadiene rubber, 23-29 parts of ethylene-propylene-diene monomer rubber, 3.2-10.6 parts of the main corrosion-resistant agent, 1.1-3.5 parts of the corrosion-resistant auxiliary agent, 0.4-1.2 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.4-0.8 parts of N-phenyl-α-naphthylamine, 0.3-0.7 parts of trimethylolpropane trimethacrylate, 0.2-0.4 parts of 2-mercaptobenzothiazole and 1-5 parts of calcium stearate, and set aside; Step 2: Add the high-density polyethylene, linear low-density polyethylene, styrene-butadiene rubber, ethylene-propylene-diene monomer rubber, main corrosion-resistant agent, corrosion-resistant auxiliary agent, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N-phenyl-α-naphthylamine, trimethylolpropane trimethacrylate, 2-mercaptobenzothiazole and calcium stearate into a high-speed mixer and stir and mix them. After mixing evenly, a mixed material is obtained; Step 3: Add the mixed material into a single-screw extruder for melt extrusion, and obtain the insulating material for marine corrosion-resistant and waterproof power cables after cooling and pelletizing.

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