Preparation method of anti-corrosion water-blocking overhead insulated wire

Abstract

The invention discloses a preparation method of an anti-corrosion water-blocking overhead insulated wire, and relates to the technical field of cables. Polyethylene, modified silicon dioxide, organic peroxide and organic tin are mixed and extruded to prepare modified polyethylene; cerium oxide, an ethylene-octylene copolymer and an ethylene-octylene segmented copolymer are used as master batch raw materials; and finally melting, extruding and coating the master batch, the modified polyethylene, the silicone rubber and the additive on the surface of the copper conductor, and curing to obtain the insulated conductor. The modified silicon dioxide participates in polyethylene cross-linking modification to form a compact network structure, so that the release of silver ions is effectively controlled, and the water blocking performance is improved; meanwhile, the ethylene-octylene copolymer and the block copolymer are compounded, so that the aging resistance and the environmental stress cracking resistance of the matrix are synergistically enhanced. The obtained conductor has excellent corrosion resistance, water resistance and aging resistance, and the service life of the overhead conductor is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a method for preparing a corrosion-resistant and water-blocking overhead insulated conductor. Background Technology

[0002] As a crucial component of power transmission, overhead insulated conductors are constantly exposed to the outdoor environment. They not only withstand the challenges of wind, sun, and rain, but also face the complex effects of industrial air pollution, salt spray corrosion, and microbial erosion. These factors can lead to a decline in the performance of the conductor insulation layer, such as aging and cracking, moisture absorption, and corrosion failure, seriously threatening the safe and stable operation of the power system.

[0003] Currently, the insulation materials used for overhead conductors are mostly polyethylene or cross-linked polyethylene. Although they possess certain electrical insulation properties and mechanical strength, their molecular chains are prone to degradation under long-term ultraviolet radiation, humid and hot environments, and chemical corrosive media. This leads to material embrittlement and the formation of microcracks, providing pathways for the intrusion of moisture and corrosive media. Moisture entering the insulation layer not only causes water treeing, accelerating insulation failure, but also corrodes the conductor core, increasing the risk of wire breakage. Furthermore, in some humid and warm regions, mold and other microorganisms easily proliferate on the surface of the insulation layer, and their metabolic products also corrode the insulation material, further shortening the service life of the conductor.

[0004] To address these issues, existing technologies often modify insulating materials by adding antioxidants, light stabilizers, or filling them with water-blocking materials. However, these methods frequently suffer from limitations such as limited performance, poor durability, or negative impacts on the mechanical properties of the material matrix. For example, simple physical blends of water-blocking materials struggle to form a long-lasting, dense water barrier; while conventional antibacterial and antifungal components have poor compatibility with the polymer matrix, leading to easy leaching and poor corrosion resistance. Therefore, developing a preparation method that synergistically enhances the aging resistance, water-blocking properties, and corrosion resistance of conductors is crucial for improving the overall service life of overhead conductors. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing corrosion-resistant and water-blocking overhead insulated conductors to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing a corrosion-resistant and water-blocking overhead insulated conductor, comprising the following steps: (1) Disperse silica nanoparticles in a silver nitrate aqueous solution with a concentration of 5-10 g / L, adjust the pH, add methacrylic acid while stirring, stir for a period of time, filter and dry to obtain modified silica; (2) Polyethylene, modified silica and organic peroxide are stirred and mixed, and then extruded to obtain modified polyethylene; (3) Cerium oxide is extruded with ethylene-octene copolymer, ethylene-octene block copolymer and initiator to obtain masterbatch; (4) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor and then cooled and solidified to obtain a corrosion-resistant and water-blocking overhead insulating conductor.

[0007] Furthermore, the mass ratio of silica nanomaterial, silver nitrate and methacrylic acid in step (1) is 1-3:0.5-3:1-6.

[0008] Furthermore, in step (1), the silica nanomaterial is obtained by acid leaching of halloysite nanotubes.

[0009] Further, in step (2), the polyethylene, modified silica, and organic peroxide are mixed in a mass ratio of 20-30:0.5-4:0.01-0.1.

[0010] Furthermore, the polyethylene in step (2) is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 15-35:40-60; the density of the high-pressure low-density polyethylene is 0.92-0.932 g / cm³. 3 The high-density polyethylene has a crystallinity of over 80% and a weight-average molecular weight greater than 150,000.

[0011] Furthermore, the organic peroxide in step (2) is selected from one of dicumyl peroxide, 2,2-di(tert-butylperoxide)butane, tert-butylpropyl peroxide, and ditert-butylperoxide isopropylbenzene.

[0012] Furthermore, the initiator in step (3) is dicumyl peroxide.

[0013] Furthermore, the ethylene-octene block copolymer described in step (3) is sourced from Dow Chemical Company, USA: INFUSE9107.

[0014] Furthermore, the ethylene-octene copolymer described in step (3) is sourced from Dow Chemical Company, USA: POE8150.

[0015] Furthermore, the silicone rubber mentioned in step (4) is RBB-2003-30 fumed silicone rubber.

[0016] Furthermore, in step (4), the mass ratio of the masterbatch, modified polyethylene, silicone rubber, and additives is 30-50:30-50:5-15:1-3.

[0017] Furthermore, the thickness of the insulating layer in step (4) is 0.8~2mm.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) This invention utilizes ethylene-octene copolymer, ethylene-octene block copolymer and modified polyethylene compound. This invention utilizes the relatively saturated molecular chain of ethylene-octene copolymer to enable the cable to achieve aging resistance, and utilizes the block structure of ethylene-octene block copolymer to enhance the stability of the matrix crystal region. The compounding and synergistic effect of the three compounds strengthens the matrix and significantly inhibits the generation and propagation of cracks in the aging environment, thereby endowing the conductor with excellent aging resistance and environmental stress cracking resistance, and ensuring long service life.

[0019] (2) The present invention uses halloysite nanotubes as raw materials. Porous silica nanomaterials are obtained by acid leaching. Then, silver ion solution and methacrylic acid solution are added in sequence. The silica nanomaterials obtained by acid leaching have certain oxygen-containing groups on their surface, which can adsorb and bind silver ions and methacrylic acid to obtain modified silica. This modified silica is used as a modifier to modify polyethylene. Through the double bond of methacrylic acid on its surface, it can undergo a grafting reaction with polyethylene, so that the nanoparticles are anchored in the polyethylene matrix in the form of chemical bonds. At the same time, it physically hinders the migration of silver ions, thereby achieving a slow-release antibacterial effect. Meanwhile, the cross-linking points formed by the modifier and the nanoparticles together improve the density of the insulation layer, which significantly enhances the water resistance of the wire. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The test methods for various indicators of the corrosion-resistant and water-blocking overhead insulated conductors produced in the following embodiments are as follows: Aging resistance: Insulating materials of the same size as those in the examples and comparative examples were hot-pressed into sheets on a flat vulcanizing machine to make samples with a length of 120mm, a width of 80mm, and a thickness of 1mm for testing. The tensile strength was tested using a universal tensile testing machine at a test temperature of 25℃. The samples were horizontally placed for 24 hours before testing, and the tensile rate was 200mm / min. The test was then conducted in a heat aging test chamber at 100℃ for 240 hours. The change rate of tensile strength was calculated to characterize the aging resistance.

[0022] Mold prevention: According to the test method 1 of GB / T2423.16-1999, the degree of mold growth is 0, otherwise it is not passed.

[0023] Water resistance: The breakdown field strength reduction rate was tested according to the test method in CN119661924B.

[0024] Example 1 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL. The soaking temperature was 90℃, the soaking time was 2h, the stirring speed was 400 r / min, and after washing, filtering and drying, they were calcined at 550℃ for 2h to obtain silica nanomaterials. (2) Disperse silica nanoparticles in a 5 g / L silver nitrate aqueous solution, stir at 60 °C and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 1:0.5:1; (3) Mix polyethylene, modified silica, and dicumyl peroxide in a mass ratio of 20:0.5:0.01, stir at 500 r / min for 10 min, and then extrude the mixture at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene; the polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 15:40. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, dicumyl peroxide, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, initiator, and maleic anhydride-grafted POE was 6:4:0.15:0.08:0.5. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, and then the insulating material is melt-coated onto the surface of the copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 30:30:5:1. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, and their mass ratio is 0.5:0.3:1.

[0025] Example 2 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL for 2 h at a temperature of 90 °C and a stirring speed of 400 r / min. After washing, filtering and drying, silica nanomaterials were obtained by calcination at 550 °C for 2 h. (2) Disperse silica nanoparticles in a silver nitrate aqueous solution with a concentration of 6 g / L, stir at 60℃ and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 2:1:1; (3) Polyethylene, modified silica, and 2,2-di(tert-butylperoxide)butane are mixed in a mass ratio of 25:0.5:0.01 and stirred at 500 r / min for 10 min. After mixing, the mixture is extruded at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene. The polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 20:40. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, dicumyl peroxide, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, initiator, and maleic anhydride-grafted POE was 6:4:0.15:0.08:0.5. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 35:30:11:1. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, with a mass ratio of 0.5:0.3:1.

[0026] Example 3 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL, at a soaking temperature of 90℃, for a soaking time of 2 h, and at a stirring speed of 400 r / min. After washing, filtering and drying, they were calcined at 550℃ for 2 h to obtain silica nanomaterials. (2) Disperse silica nanoparticles in a 7 g / L silver nitrate aqueous solution, stir at 70 °C and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 3:1.5:3; (3) Mix polyethylene, modified silica, and tert-butylpropylbenzene peroxide in a mass ratio of 30:1.4:0.05, stir at 500 r / min for 10 min, and then extrude the mixture at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene; the polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 25:50. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, dicumyl peroxide, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, initiator, and maleic anhydride-grafted POE was 6:4:0.15:0.08:0.5. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 40:35:10:2. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, with a mass ratio of 0.5:0.3:1.

[0027] Example 4 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL, at a soaking temperature of 90℃, for a soaking time of 2 h, and at a stirring speed of 400 r / min. After washing, filtering and drying, they were calcined at 550℃ for 2 h to obtain silica nanomaterials. (2) Disperse silica nanoparticles in an aqueous solution of silver nitrate with a concentration of 8 g / L, stir at 80°C and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 1:2:4; (3) Mix polyethylene, modified silica, and dicumyl peroxide in a mass ratio of 20:2.2:0.05, stir at 500 r / min for 10 min, and then extrude the mixture at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene; the polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 30:55. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, dicumyl peroxide, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, dicumyl peroxide, and maleic anhydride-grafted POE was 6:4:0.07:0.08:0.1. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of a copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 45:50:15:3. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, with a mass ratio of 0.5:0.3:1.

[0028] Example 5 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL, at a soaking temperature of 90℃, for a soaking time of 2 h, and at a stirring speed of 400 r / min. After washing, filtering and drying, they were calcined at 550℃ for 2 h to obtain silica nanomaterials. (2) Disperse silica nanoparticles in a 10 g / L silver nitrate aqueous solution, stir at 90 °C and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 3:2.5:4; (3) Polyethylene, modified silica, and 2,2-di(tert-butylperoxide)butane are mixed in a mass ratio of 28:3.2:0.05 and stirred at 500 r / min for 10 min. After mixing, the mixture is extruded at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene. The polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 35:60. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, dicumyl peroxide, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of the ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, dicumyl peroxide, and maleic anhydride-grafted POE was 6:4:0.15:0.08:0.5. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 50:42:11:3. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, with a mass ratio of 0.5:0.3:1.

[0029] Example 6 (1) Halloysite nanotubes were soaked in 2 mol / L hydrochloric acid at a solid-liquid ratio of 1:400 g / mL, at a soaking temperature of 90℃, for a soaking time of 2 h, and at a stirring speed of 400 r / min. After washing, filtering and drying, they were calcined at 550℃ for 2 h to obtain silica nanomaterials. (2) Disperse silica nanoparticles in a 10 g / L silver nitrate aqueous solution, stir at 80 °C and 400 r / min for 30 min, add ammonia dropwise until pH=8.5, maintain for 10 min, add methacrylic acid, continue stirring for 2 h, filter and dry to obtain modified silica; the mass ratio of silica nanoparticles, silver nitrate and methacrylic acid is 2:3:4; (3) Mix polyethylene, modified silica, and dicumyl peroxide in a mass ratio of 20:4:0.05, stir at 500 r / min for 10 min, and then extrude the mixture at a temperature between 160℃ and 180℃, with the main screw speed at 150 rpm and the feed screw speed at 55 rpm to obtain modified polyethylene; the polyethylene is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 22:50. (4) Cerium oxide with a particle size of 500 nm was pretreated and mixed with KH570 and ethanol at a mass ratio of 2:0.1:15. The mixture was reacted at 60°C for 1 h. The solid was then taken, washed twice with deionized water, dried at 80°C for 4 h, and then extruded with ethylene-octene copolymer, ethylene-octene block copolymer, initiator, and maleic anhydride-grafted POE at an extrusion temperature of 143-163°C to obtain masterbatch. The mass ratio of ethylene-octene copolymer, ethylene-octene block copolymer, cerium oxide, initiator, and maleic anhydride-grafted POE was 6:4:0.15:0.08:0.5. The initiator was dicumyl peroxide. (5) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor to obtain an insulating layer with a thickness of 0.8 mm. After cooling and solidification, a corrosion-resistant and water-blocking overhead insulated conductor is obtained. The extrusion temperature is 160-195℃. The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 50:30:9:2. The additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, with a mass ratio of 0.5:0.3:1.

[0030] Comparative Example 1 The difference between Comparative Example 1 and Example 6 is that halloysite nanotubes are not subjected to acid leaching treatment, and halloysite nanotubes are used instead of silica nanomaterials. The remaining steps are the same as in Example 2.

[0031] Comparative Example 2 The difference between Comparative Example 2 and Example 6 is that silver nitrate is not added; the remaining steps are the same as in Example 2.

[0032] Comparative Example 3 The difference between Comparative Example 3 and Example 6 is that methacrylic acid is not added, while the other steps are the same as in Example 2.

[0033] Comparative Example 4 The difference between Comparative Example 4 and Example 6 is that step (3) is omitted, and step (5) is changed to: masterbatch, polyethylene, silicone rubber, additives and modified silica are melt-extruded to obtain insulating material, and then melt-coated onto the surface of copper wire to obtain an insulating layer with a thickness of 0.8 mm, and then cooled and solidified to obtain corrosion-resistant and water-blocking overhead insulated wire. The extrusion temperature is 160-195℃; the mass ratio of the masterbatch, polyethylene, silicone rubber, additives and modified silica is 50:30:9:2:6; the additive is composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, and the mass ratio is 0.5:0.3:1; the remaining steps are the same as in Example 2.

[0034] Comparative Example 5 The difference between Comparative Example 5 and Example 6 is that step (4) is omitted, and step (5) is changed to: masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain insulating material, and then melt-coated onto the surface of copper wire to obtain an insulating layer with a thickness of 0.8 mm, and then cooled and solidified to obtain corrosion-resistant and water-blocking overhead insulated wire. The extrusion temperature is 160-195℃; the mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives is 50:30:9:2; the additives are composed of stearic acid, antioxidant 1010 and trimethylolpropane triacrylate, and their mass ratio is 0.5:0.3:1; the masterbatch is ethylene-octene copolymer and ethylene-octene block copolymer with a mass ratio of 6:4; the remaining steps are the same as in Example 2.

[0035] Comparative Example 6 The difference between Comparative Example 6 and Example 6 is that polyethylene is used instead of ethylene-octene copolymer and ethylene-octene block copolymer, while the other steps are the same as in Example 6.

[0036] Comparative Example 7 The difference between Comparative Example 7 and Example 6 is that both polyethylene and ethylene-octene block copolymer are replaced with ethylene-octene copolymer, while the other steps are the same as in Example 6.

[0037] Comparative Example 8 The difference between Comparative Example 8 and Example 6 is that ethylene-octene copolymer and polyethylene are replaced with ethylene-octene block copolymer, while the other steps are the same as in Example 6.

[0038] Example of effect Table 1 below presents the performance analysis results of the corrosion-resistant and water-blocking overhead insulated conductors of Examples 1 to 6 and Comparative Examples 1 to 8 of the present invention.

[0039] Table 1 It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing a corrosion-resistant and water-blocking overhead insulated conductor, characterized in that, Includes the following steps: (1) Disperse silica nanoparticles in a silver nitrate aqueous solution with a concentration of 5-10 g / L, adjust the pH, add methacrylic acid while stirring, stir for a period of time, filter and dry to obtain modified silica; (2) Polyethylene, modified silica and organic peroxide are stirred and mixed, and then extruded to obtain modified polyethylene; (3) Cerium oxide is extruded with ethylene-octene copolymer, ethylene-octene block copolymer and initiator to obtain masterbatch; (4) The masterbatch, modified polyethylene, silicone rubber and additives are melt-extruded to obtain an insulating material, which is then melt-coated onto the surface of the copper conductor and then cooled and solidified to obtain a corrosion-resistant and water-blocking overhead insulating conductor.

2. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The mass ratio of silica nanomaterial, silver nitrate and methacrylic acid in step (1) is 1-3:0.5-3:1-6.

3. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, In step (1), the silica nanomaterial is obtained by acid leaching of halloysite nanotubes.

4. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, In step (2), the polyethylene, modified silica, and organic peroxide are mixed in a mass ratio of 20-30:0.5-4:0.01-0.

1.

5. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The polyethylene in step (2) is composed of low-density polyethylene and high-density polyethylene in a mass ratio of 15-35:40-60.

6. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The organic peroxide in step (2) is selected from one of dicumyl peroxide, 2,2-di(tert-butylperoxide)butane, tert-butylpropyl peroxide, and ditert-butylperoxide isopropylbenzene.

7. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The initiator in step (3) is dicumyl peroxide.

8. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The mass ratio of the masterbatch, modified polyethylene, silicone rubber and additives in step (4) is 30-50:30-50:5-15:1-3.

9. The method for preparing a corrosion-resistant and water-blocking overhead insulated conductor according to claim 1, characterized in that, The thickness of the insulating layer in step (4) is 0.8~2mm.

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