Corrosion-resistant aluminum alloy power cable

Abstract

This invention relates to the field of power cable technology and proposes a corrosion-resistant aluminum alloy power cable, comprising, from the inside out, an aluminum alloy conductor, an insulation layer, and a sheath. The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride (PVC), 8-12 parts chlorinated PVC, 20-30 parts plasticizer, 6-8 parts stabilizer, 15-20 parts filler, and 2-5 parts additives; the PVC has a K-value of 66-71; the chlorinated PVC is composed of first chlorinated PVC and second chlorinated PVC, with different K-values ​​for the first and second chlorinated PVC. This technical solution solves the problem of insufficient corrosion resistance in related technologies for aluminum alloy power cables.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and more specifically, to a corrosion-resistant aluminum alloy power cable. Background Technology

[0002] Aluminum alloy power cables are power transmission and distribution cables made with aluminum-based alloy conductors as the core and equipped with insulation and sheath structures. They are widely used in various scenarios such as municipal power grid transformation, power distribution in industrial and mining areas, outdoor overhead wiring, and power transmission and distribution in chemical industrial parks. They are a basic cable category whose usage in the current power transmission field is increasing year by year.

[0003] However, existing aluminum alloy power cables still have shortcomings in corrosion resistance. Long-term contact with corrosive media can easily lead to swelling, powdering, cracking, and delamination of the sheath. After the protective barrier fails, external water vapor, salt ions, and acid and alkali corrosive media can directly penetrate the sheath and invade the outside of the insulation layer. Under the continuous erosion of corrosive media, the insulation material gradually becomes brittle, hydrolyzes, and its insulation resistance decreases, which can easily cause electrical safety hazards such as phase-to-phase leakage and short circuit to ground. At the same time, mud and corrosive liquid will continue to accumulate at the damaged points of the sheath, accelerating the aging of the outer structure of the cable layer by layer and significantly reducing the designed service life of the cable.

[0004] Therefore, it is very necessary to develop a corrosion-resistant aluminum alloy power cable. Summary of the Invention

[0005] This invention proposes a corrosion-resistant aluminum alloy power cable, which solves the problem of insufficient corrosion resistance of aluminum alloy power cables in related technologies.

[0006] The technical solution of the present invention is as follows: This invention proposes a corrosion-resistant aluminum alloy power cable, comprising, from the inside out, an aluminum alloy conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride (PVC), 8-12 parts chlorinated PVC, 20-30 parts plasticizer, 6-8 parts stabilizer, 15-20 parts filler, and 2-5 parts additives; the PVC has a K value of 66-71; the chlorinated PVC is composed of a first chlorinated PVC and a second chlorinated PVC, wherein the first chlorinated PVC and the second chlorinated PVC have different K values.

[0007] Preferably, the insulating layer is a cross-linked polyethylene insulating layer.

[0008] Preferably, the K value of the first chlorinated polyvinyl chloride is 53-57, and the K value of the second chlorinated polyvinyl chloride is 60-63.

[0009] Preferably, the mass ratio of the first chlorinated polyvinyl chloride to the second chlorinated polyvinyl chloride is 3:6~7.

[0010] Preferably, the plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, and diisononyl phthalate.

[0011] Preferably, the stabilizer is a calcium-zinc composite stabilizer.

[0012] Preferably, the additive is composed of an antioxidant and a lubricant in a mass ratio of 1:2 to 3.

[0013] Preferably, the filler comprises the following components in parts by weight: 100 parts talc, 4-5 parts monoalkoxy pyrophosphate titanate coupling agent, and 1-2 parts quaternized silane coupling agent.

[0014] Preferably, the monoalkoxy pyrophosphate titanate coupling agent is isopropyltris(dioctylpyrophosphate)titanate; the quaternized silane coupling agent includes one or two of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride.

[0015] Preferably, when the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride, the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to (3-triethoxysilylpropyl)trimethylammonium chloride is 1.5~1.8:1.

[0016] Preferably, the preparation method of the filler includes the following steps: dispersing a monoalkoxy pyrophosphate type titanate coupling agent and a quaternized silane coupling agent in a solvent, adding talc powder, mixing and drying to obtain the filler.

[0017] Preferably, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0018] Preferably, the lubricant comprises one or more of calcium stearate, stearic acid, and polyethylene wax.

[0019] The working principle and beneficial effects of this invention are as follows: In this invention, polyvinyl chloride (PVC) is added as the main material to the sheath layer of the aluminum alloy power cable, and the K value is limited to 66~71. The PVC molecular chain regularity in this K value range is moderate and the intermolecular packing is dense. Two types of chlorinated PVC with different K values, namely first chlorinated PVC and second chlorinated PVC, are added. The two types of chlorinated PVC with different K values ​​interpenetrate and entwine with each other in the PVC matrix to form a dense interpenetrating polymer network structure, forming an anti-corrosion barrier and improving the corrosion resistance of the aluminum alloy cable. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0021] A specific embodiment of the first aspect of the present invention provides a corrosion-resistant aluminum alloy power cable, comprising, from the inside out, an aluminum alloy conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride (PVC), 8-12 parts of chlorinated PVC, 20-30 parts of plasticizer, 6-8 parts of stabilizer, 15-20 parts of filler, and 2-5 parts of additives; the K value of the PVC is 66-71; the chlorinated PVC is composed of first chlorinated PVC and second chlorinated PVC, and the K values ​​of the first chlorinated PVC and the second chlorinated PVC are different.

[0022] In this invention, the sheath layer employs a synergistic system of polyvinyl chloride (PVC) with two different K-value chlorinated PVCs, combined with additives, fillers, and other components, to enhance the overall corrosion resistance of the cable. The molecular chain structure and aggregation state of chlorinated PVCs with different K-values ​​differ; their combination optimizes the molecular stacking structure of the matrix resin, improves material density, and effectively prevents the penetration of acids, alkalis, moisture, and corrosive media into the layer. Simultaneously, chlorinated PVC itself possesses excellent chemical corrosion resistance, which, when combined with the main PVC, further strengthens the corrosion resistance of the resin matrix.

[0023] In one embodiment of the present invention, the K value of the first chlorinated polyvinyl chloride is 53-57, and the K value of the second chlorinated polyvinyl chloride is 60-63.

[0024] In this invention, two types of chlorinated polyvinyl chloride (PVC) with K values ​​of 53-57 and 60-63 are selected for blending. The low-K-value PVC exhibits excellent flowability, effectively filling the voids in the resin system and improving overall density. The high-K-value PVC has longer molecular chains, resulting in superior mechanical properties and resistance to various media. The combination forms an interpenetrating network structure, significantly reducing micropores and penetration channels, effectively blocking the intrusion of corrosive media such as acids, alkalis, and salt spray. Simultaneously, this combination shows good compatibility with PVC with a K value of 66-71, further enhancing overall chemical corrosion resistance. This ensures the sheath is less susceptible to erosion and cracking under complex corrosive conditions, guaranteeing long-term stable cable use.

[0025] In one embodiment of the present invention, the mass ratio of the first chlorinated polyvinyl chloride to the second chlorinated polyvinyl chloride is 3:6~7.

[0026] In this invention, the mass ratio of the first chlorinated polyvinyl chloride (PVC) to the second chlorinated PVC is 3:6~7. At this ratio, the low-K-value component fully impregnates and fills the gaps in the matrix, while the high-K-value component constructs a continuous and stable skeleton structure. The two form a dense and uniform composite network, minimizing the internal pores of the material and blocking the penetration path of corrosive media. At the same time, this ratio can promote the compatibility of the two chlorinated PVCs with the main PVC, avoid phase separation problems, and improve the stability of the sheath layer.

[0027] In one embodiment of the present invention, the plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, and diisononyl phthalate, preferably dioctyl phthalate.

[0028] In this invention, plasticizers can weaken the intermolecular forces of resin molecules, improve the flexibility and processing fluidity of the sheath material, prevent the material from hardening and cracking, and are not easily lost in corrosive environments. They can also help improve the overall density of the resin matrix and reduce the penetration of corrosive media.

[0029] In one embodiment of the present invention, the stabilizer is a calcium-zinc composite stabilizer.

[0030] In this invention, the stabilizer is a calcium-zinc composite stabilizer, which can effectively absorb and neutralize the harmful hydrogen chloride produced by the resin under heat and corrosive environments, inhibit the dechlorination degradation of the resin molecular chain, and delay the aging and deterioration of the material. At the same time, it can improve the thermal stability of the sheath material and avoid problems such as yellowing, powdering, and cracking during processing and long-term service.

[0031] In one embodiment of the present invention, the additive is composed of an antioxidant and a lubricant in a mass ratio of 1:2 to 3.

[0032] In one embodiment of the present invention, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076, preferably antioxidant 1010.

[0033] In this invention, free radicals generated by the oxidation reaction of the resin system can be captured, the oxidation chain reaction can be blocked, and the oxidation aging of the sheath material under light, high temperature and corrosive environment can be effectively delayed, thus avoiding problems such as hardening, cracking and performance degradation of the material.

[0034] In one embodiment of the present invention, the lubricant includes one or more of calcium stearate, stearic acid, and polyethylene wax, preferably calcium stearate.

[0035] In this invention, the lubricant can reduce the frictional resistance between resin molecules and between the material and the processing equipment, improve the flowability of the extrusion process, and enhance the uniformity and surface finish of the sheath molding. Simultaneously, it can reduce shear heating during processing, help protect the resin matrix, prevent localized overheating and aging, and also improve the dispersion uniformity of each component, maintaining the overall structural stability of the material.

[0036] In one embodiment of the present invention, the filler comprises the following raw materials in parts by weight: 100 parts of talc powder, 4-5 parts of monoalkoxy pyrophosphate titanate coupling agent, and 1-2 parts of quaternized silane coupling agent.

[0037] In this invention, talc powder is used as the main filler, and it is synergistically modified with titanate coupling agents and quaternized silane coupling agents. Talc powder itself has excellent rigidity and filling and reinforcing effects, which can effectively improve the overall mechanical strength and dimensional stability of the sheath matrix. The monoalkoxy pyrophosphate titanate coupling agent can improve the interfacial bonding state between talc powder and resin matrix, eliminate filler agglomeration, and allow the filler to be uniformly dispersed in the system. The quaternized silane coupling agent further strengthens the interfacial adhesion between the filler and the polymer chain, thereby improving the strength of the cable sheath.

[0038] In one embodiment of the present invention, the monoalkoxy pyrophosphate type titanate coupling agent is isopropyltris(dioctylpyrophosphate)titanate; the quaternized silane coupling agent includes one or two of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride.

[0039] In one embodiment of the present invention, when the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride, the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to (3-triethoxysilylpropyl)trimethylammonium chloride is 1.5 to 1.8:1.

[0040] In this invention, the long alkyl chain of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride can improve the compatibility and lubrication dispersibility of the filler and resin. The trimethoxysilyl group readily bonds with the hydroxyl groups on the surface of talc. The silyl group of (3-triethoxysilylpropyl)trimethylammonium chloride has higher reactivity. The combination of the two helps to synergistically improve the dispersibility of talc and its bonding strength with the matrix, thereby increasing the strength of the sheath layer. When the mass ratio of the two is 1.5~1.8:1, it can effectively prevent the agglomeration of talc and enhance the interfacial strength between talc and the matrix. If the proportion of long alkyl chain coupling agent is insufficient, the dispersibility of the filler will be poor, and agglomeration, local stress concentration, and decreased material strength will easily occur. If the long alkyl component is excessive, the excess long alkyl component will be free between the two phases, which will weaken the interfacial adhesion at the interface and will be detrimental to the improvement of strength.

[0041] In one embodiment of the present invention, the method for preparing the filler includes the following steps: dispersing a monoalkoxy pyrophosphate type titanate coupling agent and a quaternized silane coupling agent in a solvent, adding talc powder, mixing and drying to obtain the filler.

[0042] In one embodiment of the present invention, the solvent is anhydrous ethanol.

[0043] In one embodiment of the present invention, the mass ratio of solvent to talc is 5 to 10:1, for example, any ratio of 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 and any range between any two ratios, preferably 5:1.

[0044] In one embodiment of the present invention, the mixing time is 1 to 5 hours, for example, it can be any point value among 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, and 5 hours, and the range between any two point values, preferably 2 hours.

[0045] In one embodiment of the present invention, the insulating layer is a cross-linked polyethylene insulating layer.

[0046] A specific embodiment of the second aspect of the present invention provides a method for preparing a corrosion-resistant aluminum alloy power cable, comprising the following steps: S1. Extruding the cross-linked polyethylene insulation layer onto the aluminum alloy conductor yields a semi-finished product; S2. Mix the raw materials for the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant aluminum alloy power cable.

[0047] In this invention, the cross-linked polyethylene insulation layer has excellent electrical insulation properties, low dielectric constant, and low insulation loss, which can effectively block current leakage, ensure the stability and safety of power transmission, and meet the power transmission requirements of aluminum alloy power cables.

[0048] Unless otherwise specified, the following embodiments and comparative examples are as follows: Polyvinyl chloride: K value 66, model PVC SG660; First-grade chlorinated polyvinyl chloride: K value 53~57, model Z-600; Secondary chlorinated polyvinyl chloride: K value 60~63, model J-1000; Talc powder: particle size 800 mesh; Calcium-zinc composite stabilizer: model number HYCZ-105.

[0049] Example 1 The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride, 8 parts chlorinated polyvinyl chloride, 20 parts dioctyl phthalate, 6 parts calcium-zinc composite stabilizer, 15 parts filler, and 2 parts additives. Chlorinated polyvinyl chloride is composed of first chlorinated polyvinyl chloride and second chlorinated polyvinyl chloride in a mass ratio of 3:6; The filler is talc powder; The additives consist of antioxidant 1010 and calcium stearate in a mass ratio of 1:2; A method for preparing a corrosion-resistant aluminum alloy power cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer onto the aluminum alloy conductor yields a semi-finished product; S2. Mix the raw materials for the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant aluminum alloy power cable.

[0050] Example 2 The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride, 10 parts chlorinated polyvinyl chloride, 25 parts dioctyl phthalate, 7 parts calcium-zinc composite stabilizer, 18 parts filler, and 3.5 parts additives. Chlorinated polyvinyl chloride is composed of first chlorinated polyvinyl chloride and second chlorinated polyvinyl chloride in a mass ratio of 3:6; The filler is talc powder; The additives consist of antioxidant 1010 and calcium stearate in a mass ratio of 1:2; A method for preparing a corrosion-resistant aluminum alloy power cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer onto the aluminum alloy conductor yields a semi-finished product; S2. Mix the raw materials for the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant aluminum alloy power cable.

[0051] Example 3 The sheath layer comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 12 parts of chlorinated polyvinyl chloride, 30 parts of dioctyl phthalate, 8 parts of calcium-zinc composite stabilizer, 20 parts of filler, and 5 parts of additives. Chlorinated polyvinyl chloride is composed of first chlorinated polyvinyl chloride and second chlorinated polyvinyl chloride in a mass ratio of 3:6; The filler is talc powder; The additives consist of antioxidant 1010 and calcium stearate in a mass ratio of 1:2; A method for preparing a corrosion-resistant aluminum alloy power cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer onto the aluminum alloy conductor yields a semi-finished product; S2. Mix the raw materials for the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant aluminum alloy power cable.

[0052] Example 4 The difference between Example 4 and Example 2 is that the chlorinated polyvinyl chloride is composed of a first chlorinated polyvinyl chloride and a second chlorinated polyvinyl chloride in a mass ratio of 3:7.

[0053] Example 5 Compared with Example 4, Example 5 differs in that the first chlorinated polyvinyl chloride (K value 53~57, model Z-600) is replaced with an equal amount of chlorinated polyvinyl chloride (K value 57~60, model J-800).

[0054] Example 6 Compared with Example 4, Example 6 differs in that the second chlorinated polyvinyl chloride (K value 60~63, model J-1000) is replaced with an equal amount of chlorinated polyvinyl chloride with K value 57~60, model J-800.

[0055] Example 7 Compared with Example 4, Example 7 differs in that polyvinyl chloride (K value 66, model PVCSG660) is replaced with an equal amount of polyvinyl chloride with K value 71, model PVCSG71Z.

[0056] Example 8 The difference between Example 4 and Example 8 is that the filler is replaced with an equal amount of filler prepared by the following preparation method; The preparation method of the filler includes the following steps: 5 parts of isopropyltris(dioctylpyrophosphoryloxy)titanate are dispersed in 500 parts of anhydrous ethanol, 100 parts of talc are added, and the mixture is dried after 2 hours to obtain the filler.

[0057] Example 9 The difference between Example 9 and Example 8 is that isopropyl tris(dioctylpyrophosphate)titanate is replaced with an equal amount of (3-triethoxysilylpropyl)trimethylammonium chloride.

[0058] Example 10 The difference between Example 10 and Example 8 is that isopropyl tris(dioctylpyrophosphate)titanate is replaced with an equal amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride.

[0059] Example 11 The difference between Example 11 and Example 8 is that the filler is replaced with an equal amount of filler prepared by the following preparation method; The preparation method of the filler includes the following steps: 4 parts of isopropyltris(dioctylpyrophosphoryloxy)titanate and 2 parts of (3-triethoxysilylpropyl)trimethylammonium chloride are dispersed in 500 parts of anhydrous ethanol, 100 parts of talc are added, and the mixture is dried after 2 hours to obtain the filler.

[0060] Example 12 The difference between Example 12 and Example 8 is that the filler is replaced with an equal amount of filler prepared by the following preparation method; The preparation method of the filler includes the following steps: 5 parts of isopropyltris(dioctylpyrophosphoryloxy)titanate and 1 part of (3-triethoxysilylpropyl)trimethylammonium chloride are dispersed in 500 parts of anhydrous ethanol, 100 parts of talc are added, and the mixture is dried after 2 hours to obtain the filler.

[0061] Example 13 The difference between Example 13 and Example 11 is that the filler is replaced with an equal amount of filler prepared by the following preparation method; The preparation method of the filler includes the following steps: 4 parts of isopropyltris(dioctylpyrophosphoryloxy)titanate and 2 parts of quaternized silane coupling agent are dispersed in 500 parts of anhydrous ethanol, 100 parts of talc are added, and the mixture is dried after 2 hours to obtain the filler; the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride in a mass ratio of 1.5:1.

[0062] Example 14 The difference between Example 14 and Example 13 is that the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride in a mass ratio of 1.8:1.

[0063] Example 15 The difference between Example 15 and Example 14 is that isopropyltris(dioctylpyrophosphate)titanate is replaced with an equal amount of diisopropoxybis(acetylacetone)titanium.

[0064] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the chlorinated polyvinyl chloride is the first chlorinated polyvinyl chloride.

[0065] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the chlorinated polyvinyl chloride is a second chlorinated polyvinyl chloride.

[0066] Comparative Example 3 Compared with Example 2, Comparative Example 3 differs in that the K value of the chlorinated polyvinyl chloride is 57~60, and the model is J-800.

[0067] Comparative Example 4 Compared with Example 2, Comparative Example 4 differs in that polyvinyl chloride (K value 66, model PVCSG660) is replaced with an equal amount of polyvinyl chloride (K value 58, model PVCSF580).

[0068] Comparative Example 5 Compared with Example 2, Comparative Example 5 differs in that polyvinyl chloride (K value 66, model PVCSG660) is replaced with an equal amount of polyvinyl chloride (K value 84, model PVCSF840).

[0069] Experimental Example 1 The sheaths of the corrosion-resistant aluminum alloy power cables prepared in Examples 1-7 and Comparative Examples 1-5 were immersed in a 10% hydrochloric acid solution for 72 hours. The tensile strength of the samples before and after immersion was tested according to the test method specified in GB / T 1040.2-2022. The test speed was 200 mm / min and the sample type was 1A.

[0070] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-7 and Comparative Examples 1-5

[0071] As shown in Table 1, when the K value of polyvinyl chloride is 66~71, and the chlorinated polyvinyl chloride is composed of first chlorinated polyvinyl chloride and second chlorinated polyvinyl chloride with different K values, the corrosion resistance of aluminum alloy power cables can be improved.

[0072] Experimental Example 2 For the sheath layer of the corrosion-resistant aluminum alloy power cable prepared in Examples 4 and 8-15, the tensile strength of the specimen was tested according to the test method specified in GB / T1040.2-2022. The test speed was 200 mm / min and the specimen type was 1A.

[0073] The test results are shown in Table 2: Table 2 Performance test results of Examples 4 and 8-15

[0074] As shown in Table 2, when the filler contains both monoalkoxy pyrophosphate titanate coupling agent and quaternized silane coupling agent, the strength of corrosion-resistant aluminum alloy power cable can be improved. When the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride, the strength of the obtained corrosion-resistant aluminum alloy power cable is even better.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant aluminum alloy power cable, comprising, from the inside out, an aluminum alloy conductor, an insulation layer, and a sheath layer, characterized in that, The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride, 8-12 parts chlorinated polyvinyl chloride, 20-30 parts plasticizer, 6-8 parts stabilizer, 15-20 parts filler, and 2-5 parts additives; the K value of the polyvinyl chloride is 66-71; the chlorinated polyvinyl chloride is composed of first chlorinated polyvinyl chloride and second chlorinated polyvinyl chloride, and the K values ​​of the first chlorinated polyvinyl chloride and the second chlorinated polyvinyl chloride are different.

2. The corrosion-resistant aluminum alloy power cable according to claim 1, characterized in that, The insulation layer is a cross-linked polyethylene insulation layer.

3. The corrosion-resistant aluminum alloy power cable according to claim 1, characterized in that, The K value of the first chlorinated polyvinyl chloride is 53~57, and the K value of the second chlorinated polyvinyl chloride is 60~63.

4. The corrosion-resistant aluminum alloy power cable according to claim 3, characterized in that, The mass ratio of the first chlorinated polyvinyl chloride to the second chlorinated polyvinyl chloride is 3:6~7.

5. The corrosion-resistant aluminum alloy power cable according to claim 1, characterized in that, The plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, and diisononyl phthalate; The stabilizer is a calcium-zinc composite stabilizer; The additive consists of an antioxidant and a lubricant in a mass ratio of 1:2 to 3.

6. The corrosion-resistant aluminum alloy power cable according to claim 1, characterized in that, The filler comprises the following raw materials in parts by weight: 100 parts talc, 4-5 parts monoalkoxy pyrophosphate titanate coupling agent, and 1-2 parts quaternized silane coupling agent.

7. The corrosion-resistant aluminum alloy power cable according to claim 1, characterized in that, The monoalkoxy pyrophosphate type titanate coupling agent is isopropyltris(dioctylpyrophosphate)titanate; the quaternized silane coupling agent includes one or two of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride.

8. The corrosion-resistant aluminum alloy power cable according to claim 7, characterized in that, When the quaternized silane coupling agent is composed of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and (3-triethoxysilylpropyl)trimethylammonium chloride, the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to (3-triethoxysilylpropyl)trimethylammonium chloride is 1.5~1.8:

1.

9. A corrosion-resistant aluminum alloy power cable according to claim 6, characterized in that, The preparation method of the filler includes the following steps: dispersing a monoalkoxy pyrophosphate titanate coupling agent and a quaternized silane coupling agent in a solvent, adding talc powder, mixing and drying to obtain the filler.

10. A corrosion-resistant aluminum alloy power cable according to claim 5, characterized in that, The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076; The lubricant includes one or more of calcium stearate, stearic acid, and polyethylene wax.

Images