A corrosion-resistant overhead insulated conductor and a preparation method thereof

Abstract

The present invention relates to the technical field of overhead conductors, and proposes a corrosion-resistant overhead insulated conductor and a preparation method thereof. A corrosion-resistant overhead insulated conductor comprises, from the inside to the outside, a conductor, an insulating layer, and a sheath layer. The raw materials of the sheath layer include the following components: nitrile rubber, EPDM rubber, a compatibilizer, an activator, an antioxidant, a filler, a softener, a plasticizer, a vulcanizer, an accelerator, and a reinforcing agent. The preparation method of the reinforcing agent comprises the following steps: A1, washing aramid pulp and adding it to a calcium chloride solution, stirring, washing, and drying to obtain pretreated aramid pulp; A2, mixing the pretreated aramid pulp with a phenolic resin to obtain a reinforcing agent. The above technical solution solves the problem of poor tensile strength of the sheath layer of the corrosion-resistant overhead insulated conductor in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead conductors, and in particular to a corrosion-resistant overhead insulated conductor and a preparation method thereof. Background Art

[0002] In modern power transmission, corrosion-resistant overhead insulated conductors are key components for efficient and stable power transmission. Their performance is directly related to the reliable operation of power systems. While the sheath of corrosion-resistant overhead insulated conductors, primarily composed of nitrile rubber and EPDM rubber, exhibits certain advantages, the sheath performance of existing corrosion-resistant overhead insulated conductors, particularly tensile strength, remains insufficient for complex and diverse application scenarios. Optimizing the reinforcing material is a key breakthrough.

[0003] Aramid pulp, a high-performance reinforcing material obtained by fibrillating the surface of aramid fibers, has gradually entered the research field. Its high strength and modulus complement the flexibility of rubber, theoretically improving the mechanical properties of the sheath layer. However, in practice, the amide bonds in the aramid pulp molecules form a conjugated effect with the benzene ring, and the amide bonds are surrounded by the benzene ring, increasing the material's inertness. This leads to poor compatibility between aramid pulp and rubber, restricting its full reinforcing effect. Therefore, how to optimize the treatment of aramid pulp and enhance its compatibility with the rubber matrix has become a core research direction for improving the tensile strength of the sheath layer of corrosion-resistant overhead insulated conductors. Summary of the Invention

[0004] The present invention provides a corrosion-resistant overhead insulated conductor and a preparation method thereof, which solves the problem of poor tensile strength of the sheath layer of the corrosion-resistant overhead insulated conductor in the related art.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention provides a corrosion-resistant overhead insulated wire, which comprises, from the inside to the outside, a conductor, an insulating layer, and a sheath layer. The raw materials of the sheath layer include the following components in parts by weight: 70-80 parts of nitrile rubber, 30-35 parts of EPDM rubber, 3-7 parts of a compatibilizer, 3-7 parts of an activator, 1-2 parts of an antioxidant, 30-40 parts of a filler, 3-8 parts of a softener, 3-8 parts of a plasticizer, 1-3 parts of a vulcanizer, 0.5-1 part of an accelerator, and 10-12 parts of a reinforcing agent.

[0007] The preparation method of the reinforcing agent comprises the following steps:

[0008] A1. After washing, the aramid pulp is added to a calcium chloride solution, stirred, washed, and dried to obtain a pretreated aramid pulp;

[0009] A2. Mixing the pretreated aramid pulp with phenolic resin to obtain the reinforcing agent.

[0010] The addition of a compatibilizer to the sheath of the corrosion-resistant overhead insulated conductor improves the uniformity of dispersion of the nitrile rubber and EPDM rubber during mixing, preventing phase separation due to poor compatibility. This facilitates the subsequent extrusion process and effectively reduces defects caused by material inhomogeneity, such as bubbles and uneven thickness, thereby ensuring the quality of the sheath.

[0011] When an antioxidant is added to the sheath of the corrosion-resistant overhead insulated conductor of the present invention, the antioxidant ensures the anti-aging properties of the sheath, thereby extending its service life. The presence of the antioxidant effectively inhibits the aging reaction of the rubber material in the conductor caused by long-term exposure to factors such as sunlight, oxygen, and temperature fluctuations, thereby maintaining the physical properties and protective functions of the sheath, and ensuring the reliability of the conductor during long-term use.

[0012] When fillers are added to the sheath layer of the corrosion-resistant overhead insulated conductor of the present invention, the fillers ensure the comprehensive performance of the sheath layer, so that the sheath layer can withstand various external forces such as wind force, self-gravity, mechanical friction, etc. in an overhead environment.

[0013] When a softener is added to the sheath layer of the corrosion-resistant overhead insulated conductor of the present invention, the softener can effectively improve the processing performance of the rubber, and the softener can be evenly dispersed during the mixing process without negatively affecting other properties of the rubber, thereby ensuring the product quality of the sheath layer.

[0014] When a plasticizer is added to the sheath layer of the corrosion-resistant overhead insulated conductor of the present invention, the long carbon chains of the plasticizer molecules can be inserted between the rubber molecular chains, weakening the interaction force between the molecular chains and increasing the flexibility and mobility of the rubber molecular chains. At the same time, the polarity of the ester group attracts the polar groups in the rubber molecules, thereby improving the compatibility of the plasticizer and the rubber, allowing the plasticizer to be evenly dispersed in the rubber matrix, so that the rubber can still maintain good flexibility and plasticity at relatively low temperatures, thereby ensuring the processing performance and low-temperature performance of the rubber.

[0015] When a vulcanizing agent is added to the sheath layer of the corrosion-resistant overhead insulated conductor of the present invention, the vulcanizing agent can connect the rubber molecular chains into a three-dimensional network structure, realize the vulcanization of the rubber, and transform it from a linear polymer with viscosity and plasticity into a vulcanized rubber with elasticity, strength and wear resistance.

[0016] When an accelerator is added to the sheath layer of the corrosion-resistant overhead insulated conductor of the present invention, the accelerator can accelerate the vulcanization speed of the rubber and effectively shorten the production cycle. The accelerator has good compatibility with the rubber and other additives and can be evenly dispersed in the rubber matrix during the mixing process, ensuring that the vulcanization reaction proceeds evenly throughout the entire rubber system and reducing the situation of local over- or under-vulcanization.

[0017] As a further technical solution, the mass ratio of the aramid pulp to the phenolic resin is 1:1.3~1.4.

[0018] In the sheath layer of the overhead insulated conductor of the present invention, when the mass ratio of aramid pulp to phenolic resin is 1:1.3-1.4, the corrosion resistance of the sheath layer of the overhead insulated conductor is further improved.

[0019] In the sheath layer of the overhead insulated conductor of the present invention, the mass ratio of aramid pulp to phenolic resin can be 1:1.3, 1:1.31, 1:1.32, 1:1.33, 1:1.34, 1:1.35, 1:1.36, 1:1.37, 1:1.38, 1:1.39, or 1:1.4, preferably 1:1.4.

[0020] As a further technical solution, the mass fraction of hydroxymethyl in the phenolic resin is 9% to 15%.

[0021] As a further technical solution, the mass concentration of the calcium chloride solution is 2% to 4%, and the solvent is methanol.

[0022] As a further technical method, the mass volume ratio of the aramid pulp to the calcium chloride solution is 1g:10~15mL.

[0023] As a further technical solution, the mixing time is 10 to 15 minutes.

[0024] As a further technical solution, the activator is composite zinc oxide;

[0025] The raw materials of the composite zinc oxide include zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile.

[0026] As a further technical solution, the preparation method of the composite zinc oxide comprises the following steps:

[0027] B1. Add zinc oxide to water, add coupling agent KH-550, stir, concentrate, and dry to obtain pretreated zinc oxide;

[0028] B2. Add the pretreated zinc oxide to ethanol, add 2-hydroxypyridine-3-carbonitrile, stir, concentrate, and dry to obtain the composite zinc oxide.

[0029] In the sheath layer of the overhead insulated conductor of the present invention, a coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile composite zinc oxide is used to improve the corrosion resistance of the sheath layer of the overhead insulated conductor. The present invention pays attention to the beneficial effect of zinc oxide as an activator on improving the vulcanization process and crosslinking density. However, since zinc oxide is easily agglomerated in the sheath layer system of the overhead insulated conductor, this leads to uneven crosslinking of the sheath layer of the overhead insulated conductor, which reduces the ability of the sheath layer of the overhead insulated conductor to resist external corrosion. After pretreating zinc oxide with the coupling agent KH-550, the dispersibility of zinc oxide in rubber is improved. On this basis, the zinc oxide is further pretreated with 2-hydroxypyridine-3-carbonitrile. Since the polar groups in 2-hydroxypyridine-3-carbonitrile make the polarity of zinc oxide and nitrile rubber closer, the compatibility and dispersibility of zinc oxide with the sheath layer material of the overhead insulated conductor are improved, so that the role of zinc oxide in stabilizing the vulcanization process and increasing the crosslinking density is fully exerted, thereby improving the corrosion resistance of the sheath layer of the overhead insulated conductor.

[0030] As a further technical solution, the mass volume ratio of zinc oxide to water is 1g:10~15mL.

[0031] As a further technical solution, the mass volume ratio of the pretreated zinc oxide to ethanol is 1g:10~15mL.

[0032] As a further technical solution, the mass ratio of the zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile is 20:1:0.2~0.5.

[0033] In the sheath layer of the overhead insulated conductor of the present invention, when the mass ratio of zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile is 20:1:0.2-0.5, the corrosion resistance of the sheath layer of the overhead insulated conductor is further improved.

[0034] As a further technical solution, in step B1, the stirring temperature is 60-80°C, the speed is 200-300 rpm, and the time is 2-3 hours;

[0035] In step B2, the stirring temperature is 30-40° C., the rotation speed is 500-600 rpm, and the time is 2-4 h.

[0036] As a further technical solution, the compatibilizer includes one or two of maleic anhydride grafted EPDM rubber and ethylene-methyl acrylate copolymer.

[0037] As a further technical solution, the antioxidant includes one or both of antioxidant RD and antioxidant MB.

[0038] In the sheath layer of the overhead insulated wire of the present invention, the antioxidant may be any one or more of conventional antioxidants, and may be one or more of antioxidant 4010N, antioxidant 4020, antioxidant A, antioxidant 264, antioxidant 2246, antioxidant RD, and antioxidant MB, and is preferably one or two of antioxidant RD and antioxidant MB.

[0039] As a further technical solution, the filler includes one or both of carbon black and white carbon black.

[0040] In the sheath layer of the overhead insulated conductor of the present invention, the filler may be any one or more conventional fillers, such as kaolin, talc, mica powder, calcium carbonate, carbon black, and white carbon black, preferably one or two of carbon black and white carbon black.

[0041] As a further technical solution, the softener includes one or both of coumarone resin and paraffin.

[0042] As a further technical solution, the plasticizer includes one or both of dinonyl phthalate and dioctyl phthalate.

[0043] As a further technical solution, the vulcanizing agent includes one or both of di-tert-butyl peroxide and cumene peroxide.

[0044] As a further technical solution, the accelerator includes one or two of N-cyclohexyl-2-benzothiazole sulfenamide and tetramethylthiuram disulfide.

[0045] The present invention also provides a method for preparing a corrosion-resistant overhead insulated conductor, which is used to prepare the corrosion-resistant overhead insulated conductor, comprising the following steps:

[0046] An insulating layer is arranged on the surface of the conductor, and after plasticizing nitrile rubber and EPDM rubber, the remaining raw materials of the sheath layer are added, mixed, extruded on the insulating layer, and vulcanized to obtain the corrosion-resistant overhead insulated wire.

[0047] The working principle and beneficial effects of the present invention are:

[0048] In the present invention, a reinforcing agent is prepared by pre-treating aramid pulp and then mixing it with a phenolic resin. This reinforcing agent is then added to the sheath layer to improve the tensile strength of the sheath layer of a corrosion-resistant overhead insulated conductor. Unlike the prior art, which directly adds aramid pulp to a rubber system but fails to address the poor compatibility between aramid pulp and rubber, the present invention pre-treats the aramid pulp with a calcium chloride solution to allow calcium ions to react with the aramid pulp, reducing the crystallinity of the aramid pulp surface and increasing its surface roughness and chemical activity. This strengthens the bond between the aramid pulp and the phenolic resin when mixed. The pre-treated aramid pulp is then mixed with the phenolic resin and added to the sheath layer. The phenolic resin promotes compatibility between the aramid pulp and the rubber raw material of the sheath layer, such as nitrile rubber, thereby improving the tensile strength of the sheath layer of the corrosion-resistant overhead insulated conductor. DETAILED DESCRIPTION

[0049] 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.

[0050] In the following examples and comparative examples, the model of the nitrile rubber is 3305E, the model of the EPDM rubber is 4045M, the grafting rate of MAH in the maleic anhydride grafted EPDM rubber (EPDM-g-MAH) is 1%, the model of the aramid pulp is 1F538, the mass fraction of the hydroxymethyl group in the phenolic resin is 9% to 15%, the model is 2402, purchased from Jinan Shanhai Chemical Technology Co., Ltd., the model of the ethylene-methyl acrylate copolymer is AX8900, the coumarone resin is purchased from Shanghai Yuantai Chemical Products Co., Ltd., the brand is 80-110, and the model of the paraffin wax is No. 60.

[0051] Example 1

[0052] A corrosion-resistant overhead insulated wire comprises, from the inside out, a conductor, an insulating layer, and a sheath layer. The sheath layer is made of the following components in parts by weight: 80 parts of nitrile rubber, 35 parts of EPDM rubber, 7 parts of ethylene-methyl acrylate copolymer, 7 parts of zinc oxide, 2 parts of antioxidant RD, 40 parts of carbon black, 8 parts of coumarone resin, 8 parts of dinonyl phthalate, 3 parts of di-tert-butyl peroxide, 1 part of N-cyclohexyl-2-benzothiazole sulfenamide, and 12 parts of a reinforcing agent.

[0053] The preparation method of the reinforcing agent comprises the following steps:

[0054] A1. After washing aramid pulp with acetone, add it to a 4 wt % calcium chloride methanol solution (the mass volume ratio of aramid pulp to calcium chloride methanol solution is 1 g:15 mL), stir, wash with methanol, and dry to obtain pretreated aramid pulp;

[0055] A2. Mixing the pretreated aramid pulp with phenolic resin (the mass ratio of aramid pulp to phenolic resin is 1:1.6) for 10 minutes to obtain a reinforcing agent;

[0056] A method for preparing a corrosion-resistant overhead insulated conductor comprises the following steps:

[0057] An insulating layer is provided on the surface of the conductor, and after plasticizing nitrile rubber and EPDM rubber, the remaining raw materials of the sheath layer are added, mixed, extruded on the insulating layer, and vulcanized to obtain a corrosion-resistant overhead insulated wire.

[0058] Example 2

[0059] A corrosion-resistant overhead insulated wire comprises, from the inside out, a conductor, an insulating layer, and a sheath layer. The sheath layer is made of the following components in parts by weight: 70 parts of nitrile rubber, 30 parts of EPDM rubber, 3 parts of maleic anhydride-grafted EPDM rubber, 3 parts of zinc oxide, 1 part of antioxidant MB, 30 parts of white carbon black, 3 parts of paraffin wax, 3 parts of dioctyl phthalate, 1 part of cumene peroxide, 0.5 parts of tetramethylthiuram disulfide, and 10 parts of a reinforcing agent.

[0060] The preparation method of the reinforcing agent comprises the following steps:

[0061] A1. After washing aramid pulp with acetone, add it to a 2 wt % calcium chloride methanol solution (the mass volume ratio of aramid pulp to calcium chloride methanol solution is 1 g:10 mL), stir, wash with methanol, and dry to obtain pretreated aramid pulp;

[0062] A2. Mixing the pretreated aramid pulp with phenolic resin (the mass ratio of aramid pulp to phenolic resin is 1:1.5) for 15 minutes to obtain a reinforcing agent;

[0063] A method for preparing a corrosion-resistant overhead insulated conductor comprises the following steps:

[0064] An insulating layer is provided on the surface of the conductor, and after plasticizing nitrile rubber and EPDM rubber, the remaining raw materials of the sheath layer are added, mixed, extruded on the insulating layer, and vulcanized to obtain a corrosion-resistant overhead insulated wire.

[0065] Example 3

[0066] The only difference between this embodiment and embodiment 2 is that the mass ratio of aramid pulp to phenolic resin in this embodiment is 1:1.2.

[0067] Example 4

[0068] The only difference between this embodiment and embodiment 2 is that the mass ratio of aramid pulp to phenolic resin in this embodiment is 1:1.3.

[0069] Example 5

[0070] The only difference between this embodiment and embodiment 2 is that the mass ratio of aramid pulp to phenolic resin in this embodiment is 1:1.4.

[0071] Example 6

[0072] The only difference between this embodiment and embodiment 5 is that the zinc oxide in this embodiment is replaced by composite zinc oxide of equal mass;

[0073] The preparation method of composite zinc oxide comprises the following steps:

[0074] B1. Mix zinc oxide and water at a mass volume ratio of 1 g:15 mL, add coupling agent KH-550, stir at 80°C and 300 rpm for 2 h, concentrate, and dry to obtain pretreated zinc oxide;

[0075] B2. Add pretreated zinc oxide to ethanol (the mass volume ratio of pretreated zinc oxide to ethanol is 1 g:15 mL), add 2-hydroxypyridine-3-carbonitrile (the mass ratio of zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile is 20:1:0.5), stir at 40°C and 600 rpm for 2 h, concentrate, and dry to obtain composite zinc oxide.

[0076] Example 7

[0077] The only difference between this embodiment and embodiment 5 is that the zinc oxide in this embodiment is replaced by composite zinc oxide of equal mass;

[0078] The preparation method of composite zinc oxide comprises the following steps:

[0079] B1. Mix zinc oxide and water at a mass volume ratio of 1 g:10 mL, add coupling agent KH-550, stir at 60°C and 200 rpm for 3 h, concentrate, and dry to obtain pretreated zinc oxide;

[0080] B2. Add pretreated zinc oxide to ethanol (the mass volume ratio of pretreated zinc oxide to ethanol is 1 g:10 mL), add 2-hydroxypyridine-3-carbonitrile (the mass ratio of zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile is 20:1:0.2), stir at 30°C and 500 rpm for 4 h, concentrate, and dry to obtain composite zinc oxide.

[0081] Comparative Example 1

[0082] The only difference between this comparative example and Example 2 is that the reinforcing agent in this comparative example is aramid pulp.

[0083] Comparative Example 2

[0084] The only difference between this comparative example and Example 2 is that the preparation method of the reinforcing agent in this comparative example includes the following steps:

[0085] The aramid pulp was washed with acetone, dried, and mixed with phenolic resin (the mass ratio of aramid pulp to phenolic resin was 1:1.5) for 15 minutes to obtain a reinforcing agent.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 2 is that the preparation method of the reinforcing agent in this comparative example includes the following steps:

[0088] The aramid pulp was washed with acetone and then added into a 2 wt % calcium chloride methanol solution (the mass volume ratio of the aramid pulp to the calcium chloride methanol solution was 1 g:10 mL), stirred, washed with methanol, and dried to obtain a reinforcing agent.

[0089] Comparative Example 4

[0090] The only difference between this comparative example and Example 2 is that the corrosion-resistant overhead insulated wire in this comparative example includes, from the inside to the outside, a conductor, an insulating layer, and a sheath layer. The raw materials of the sheath layer include the following components in parts by weight: 70 parts of nitrile rubber, 30 parts of EPDM rubber, 3 parts of maleic anhydride-grafted EPDM rubber, 3 parts of zinc oxide, 1 part of antioxidant MB, 30 parts of white carbon black, 3 parts of paraffin wax, 3 parts of dioctyl phthalate, 1 part of isopropyl benzene peroxide, 0.5 parts of tetramethylthiuram disulfide, 4 parts of aramid pulp, and 6 parts of phenolic resin.

[0091] Experimental Example 1

[0092] The sheath layers of the corrosion-resistant overhead insulated conductors prepared in Examples 1-5 and Comparative Examples 1-4 were tested for tensile strength according to the method specified in GB / T 2951.11-2008, "General Test Methods for Insulation and Sheathing Materials of Electrical and Optical Cables - Part 11: General Test Methods - Thickness and Dimensional Measurements - Mechanical Properties Tests." The test specimens were dumbbell specimens, tested at a speed of 250 mm / s, and had a thickness of 1 mm. The test results are shown in Table 1.

[0093] Table 1 Tensile strength test results

[0094]

[0095] As shown in Table 1, the tensile strength of the sheath layer of the corrosion-resistant overhead insulated conductors prepared in Examples 1 to 5 of the present invention reaches above 17.1 MPa. Therefore, the present invention uses calcium chloride to pretreat aramid pulp and then mixes it with phenolic resin to improve the tensile strength of the sheath layer of the corrosion-resistant overhead insulated conductor.

[0096] Experimental Example 2

[0097] The sheath layers of the corrosion-resistant overhead insulated conductors prepared in Examples 5-7 were tested for tensile strength according to the method specified in GB / T 2951.11-2008, "General Test Methods for Insulation and Sheathing Materials of Electrical and Optical Cables - Part 11: General Test Methods - Measurement of Thickness and Dimensions - Mechanical Properties." The test specimens were dumbbell specimens, tested at a speed of 250 mm / s, and had a thickness of 1 mm. Additionally, the specimens prepared in Examples 5-7 were immersed in a 30% sulfuric acid aqueous solution at room temperature for 24 hours, and the tensile strength was retested. The test results are shown in Table 2.

[0098] Table 2 Tensile strength test results

[0099]

[0100] As can be seen from Table 2, the sheath layer of the corrosion-resistant overhead insulated conductors prepared in Examples 6 and 7 has a tensile strength change rate of less than 9.2% after acid immersion. Therefore, the use of coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile composite zinc oxide in the present invention improves the corrosion resistance of the sheath layer of the overhead insulated conductor, making the sheath layer of the overhead insulated conductor more resistant to corrosion in complex environmental conditions such as acid rain during use.

[0101] 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 overhead insulated conductor, characterized in that: The material comprises, from the inside to the outside, a conductor, an insulating layer and a sheath layer, wherein the raw materials of the sheath layer include the following components in parts by weight: 70-80 parts of nitrile rubber, 30-35 parts of EPDM rubber, 3-7 parts of a compatibilizer, 3-7 parts of an activator, 1-2 parts of an antioxidant, 30-40 parts of a filler, 3-8 parts of a softener, 3-8 parts of a plasticizer, 1-3 parts of a vulcanizer, 0.5-1 parts of an accelerator, and 10-12 parts of a reinforcing agent; The preparation method of the reinforcing agent comprises the following steps: A1. After washing, the aramid pulp is added to a calcium chloride solution, stirred, washed, and dried to obtain a pretreated aramid pulp; A2, mixing the pretreated aramid pulp with a phenolic resin to obtain the reinforcing agent; The activator is composite zinc oxide; The raw materials of the composite zinc oxide include zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile; The filler includes one or both of carbon black and white carbon black.

2. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The mass ratio of the aramid pulp to the phenolic resin is 1:1.3-1.

4.

3. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The mass fraction of hydroxymethyl in the phenolic resin is 9% to 15%.

4. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The mass concentration of the calcium chloride solution is 2% to 4%, and the solvent is methanol.

5. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The mixing time is 10 to 15 minutes.

6. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The preparation method of the composite zinc oxide comprises the following steps: B1. Add zinc oxide to water, add coupling agent KH-550, stir, concentrate, and dry to obtain pretreated zinc oxide; B2. Add the pretreated zinc oxide to ethanol, add 2-hydroxypyridine-3-carbonitrile, stir, concentrate, and dry to obtain the composite zinc oxide.

7. The corrosion-resistant overhead insulated conductor according to claim 6, characterized in that: The mass ratio of zinc oxide, coupling agent KH-550 and 2-hydroxypyridine-3-carbonitrile is 20:1:0.2-0.5; In step B1, the stirring temperature is 60-80°C, the speed is 200-300 rpm, and the time is 2-3 hours; In step B2, the stirring temperature is 30-40° C., the rotation speed is 500-600 rpm, and the time is 2-4 h.

8. The corrosion-resistant overhead insulated conductor according to claim 1, characterized in that: The compatibilizer includes one or two of maleic anhydride grafted EPDM rubber and ethylene-methyl acrylate copolymer; The antioxidant includes one or both of antioxidant RD and antioxidant MB; The softener includes one or both of coumarone resin and paraffin; The plasticizer includes one or both of dinonyl phthalate and dioctyl phthalate; The vulcanizing agent includes one or two of di-tert-butyl peroxide and cumene peroxide; The accelerator includes one or two of N-cyclohexyl-2-benzothiazole sulfenamide and tetramethylthiuram disulfide.

9. A method for preparing a corrosion-resistant overhead insulated conductor, for preparing a corrosion-resistant overhead insulated conductor according to any one of claims 1 to 8, characterized in that: The following steps are involved: An insulating layer is arranged on the surface of the conductor, and after plasticizing nitrile rubber and EPDM rubber, the remaining raw materials of the sheath layer are added, mixed, extruded on the insulating layer, and vulcanized to obtain the corrosion-resistant overhead insulated wire.

Images