Corrosion-resistant low-voltage cable and method for producing same

Abstract

The application relates to the technical field of cables, and discloses a corrosion-resistant low-voltage cable and a preparation method thereof. The corrosion-resistant low-voltage cable comprises, from inside to outside, a conductor, an insulation layer and a sheath layer. The sheath layer comprises the following components by weight: 100 parts of polyvinyl chloride, 10-15 parts of chlorinated polyethylene, 15-20 parts of ethylene-vinyl acetate copolymer, 25-30 parts of a filler and 10-15 parts of an additive. The average polymerization degree of the polyvinyl chloride is 1020-1050, the chlorine content of the chlorinated polyethylene is 35wt%-36wt%, and the melt viscosity of the chlorinated polyethylene is 2400 Pa.s. The above technical scheme solves the problem of insufficient corrosion resistance of low-voltage cables in the related art.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a corrosion-resistant low-voltage cable and its manufacturing method. Background Technology

[0002] Low-voltage cables, as a key component of power transmission systems, are directly related to the stability and security of power supply and are widely used in various environments such as industrial production, residential buildings, municipal engineering, mining, and coastal areas.

[0003] In practical applications, low-voltage cables often face complex and harsh environmental corrosion, such as acid and alkaline gases in industrial plants, corrosive ions in underground soil, salt spray in marine environments, mold growth in humid environments, and ultraviolet aging outdoors. These corrosive factors continuously affect the outer protective structure of the cable.

[0004] However, the corrosion resistance of low-voltage cables is still insufficient. If low-voltage cables do not have sufficient corrosion resistance, a series of hazards will occur in corrosive environments. The outer sheath of the cable is prone to aging, cracking, swelling, or powdering, leading to the failure of the protective barrier; this in turn exposes the internal insulation layer to the corrosive environment, causing a decline in insulation performance, resulting in faults such as leakage and short circuits, and in severe cases, it may cause safety accidents such as fires and electric shocks; at the same time, corrosion damage will shorten the service life of the cable, increase the cost of replacement and maintenance, and especially in critical scenarios such as industrial production and municipal power supply, it may also lead to production interruptions, public service disruptions, and cause significant economic losses and social impact.

[0005] Therefore, it is necessary to develop a low-voltage cable with corrosion resistance. Summary of the Invention

[0006] This invention proposes a corrosion-resistant low-voltage cable and its preparation method, which solves the problem of insufficient corrosion resistance of low-voltage cables in related technologies.

[0007] The technical solution of the present invention is as follows: The present invention proposes a corrosion-resistant low-voltage cable, which comprises, from the inside out, a 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, 10-15 parts of chlorinated polyethylene, 15-20 parts of ethylene-vinyl acetate copolymer, 25-30 parts of filler, and 10-15 parts of additives; the average degree of polymerization of the polyvinyl chloride is 1020-1050, the chlorine content of the chlorinated polyethylene is 35wt%-36wt%, and the melt viscosity of the chlorinated polyethylene is 2400 Pa·s.

[0008] As a further technical solution, the conductor is made of copper.

[0009] As a further technical solution, the insulation layer is a cross-linked polyethylene insulation layer.

[0010] As a further technical solution, the filler includes one or more of calcium carbonate, kaolin, and carbon black, preferably calcium carbonate.

[0011] As a further technical solution, the additive is composed of antioxidants, plasticizers, stabilizers and compatibilizers in a mass ratio of 1:3 to 5:1:3.

[0012] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0013] The present invention adds an antioxidant to the sheath layer of the corrosion-resistant low-voltage cable. The addition of the antioxidant can capture free radicals generated during the oxidation process, terminate the oxidation chain reaction, slow down the aging rate of the substrate, and ensure that the sheath layer maintains its structural integrity and protective performance for a long time.

[0014] As a further technical solution, the plasticizer includes one or both of dioctyl adipate and dioctyl sebacate.

[0015] The present invention adds a plasticizer to the sheath layer of the corrosion-resistant low-voltage cable. The plasticizer can be inserted between the molecular chains of the polyvinyl chloride-chlorinated polyethylene blend substrate, weakening the intermolecular forces, reducing the melt viscosity and processing temperature, making the sheath material more fluid during the preparation process, avoiding surface defects or internal pores caused by poor processability, and ensuring the compactness of the sheath layer structure.

[0016] As a further technical solution, the stabilizer includes one or more of calcium-zinc composite stabilizer, lead stearate, and dibutyltin dilaurate, preferably calcium-zinc composite stabilizer.

[0017] The present invention adds a stabilizer to the sheath layer of the corrosion-resistant low-voltage cable. The stabilizer can improve the sheath layer's resistance to environmental factors such as light, heat, and humidity, inhibit the aging process, avoid material performance deterioration during long-term use, and extend the service life of the cable in complex corrosive environments.

[0018] As a further technical solution, the compatibilizer is maleic anhydride-grafted EVA.

[0019] The present invention adds a compatibilizer to the sheath layer of the corrosion-resistant low-voltage cable. The addition of the compatibilizer can not only break the interfacial tension between components and avoid phase separation, but also promote the full dispersion of each substrate, composite filler and other additives in the melt processing to form a uniform and stable blend system, reduce internal defects caused by component agglomeration, ensure the sheath layer structure is dense and enhance the barrier ability against corrosive media.

[0020] As a further technical solution, the filler is a composite filler, and the preparation method of the composite filler includes the following steps: dispersing a chlorotrimethoxysilane compound in a solvent, adding the filler, mixing and drying to obtain the composite filler.

[0021] In the sheath layer of the corrosion-resistant low-voltage cable of this invention, a filler treated with a chlorotrimethoxysilane compound is added. The chlorotrimethoxysilane compound contains chlorine functional groups and siloxane groups in its molecular structure, which can form an interaction force with the hydroxyl groups on the filler surface, effectively reducing the surface polarity of the filler, improving its compatibility with the polyvinyl chloride-chlorinated polyethylene blend substrate, preventing the filler from agglomerating in the substrate, achieving uniform dispersion of the filler, thereby reducing stress concentration points and improving the overall mechanical properties of the sheath layer.

[0022] As a further technical solution, the chlorotrimethoxysilane compound includes one or two of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane.

[0023] As a further technical solution, the chlorotrimethoxysilane compound is composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1~1.2:2.5.

[0024] In the sheath layer of the corrosion-resistant low-voltage cable of this invention, during the preparation of the composite filler, the chlorotrimethoxysilane compound is composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1~1.2:2.5. The straight-chain alkyl structure of 3-chloropropyltrimethoxysilane has a certain degree of flexibility, giving the crosslinked network good deformation adaptability, which can alleviate stress concentration under stress and improve the deformation resistance of the sheath layer. The phenyl structure of 4-(chloromethyl)phenyltrimethoxysilane is more rigid and can improve the interfacial bonding strength. The combination of the two can promote the uniform dispersion of the composite filler in the substrate to form a continuous reinforcing network, effectively improving the tensile strength of the corrosion-resistant low-voltage cable.

[0025] As a further technical solution, the mass ratio of the chlorotrimethoxysilane compound to the filler is 4~5:50.

[0026] As a further technical solution, the solvent is composed of anhydrous ethanol and water in a mass ratio of 5:1.

[0027] As a further technical solution, the mass ratio of the solvent to the filler is 4 to 8:1, for example, it can be 4:1, 5:1, 6:1, 7:1, or 8:1, preferably 6:1.

[0028] As a further technical solution, the mixing time is 3 to 5 hours, for example, it can be 3 hours, 3.5 hours, 4 hours, 4.5 hours, or 5 hours, preferably 4 hours.

[0029] This invention also proposes a method for preparing a corrosion-resistant low-voltage cable, comprising the following steps: S1. Extruding the insulating layer material over the conductor to obtain a semi-finished product; S2. After mixing the raw materials of the sheath layer, the mixture is extruded onto the semi-finished product to obtain the corrosion-resistant low-voltage cable.

[0030] The working principle and beneficial effects of this invention are as follows: In the sheath layer of the corrosion-resistant low-voltage cable of this invention, chlorinated polyethylene and polyvinyl chloride are blended. By limiting the average degree of polymerization of polyvinyl chloride to 1020-1050, the molecular chain length of the substrate is moderate, ensuring both the compactness of its own structure and reducing the penetration channels of corrosive media (such as acid and alkali gases, corrosive ions, and salt spray). It also allows for the formation of a stable blend system with other components, avoiding compatibility issues caused by excessively high polymerization or structural loosening caused by excessively low polymerization, thus strengthening the corrosion resistance foundation at the substrate level. The chlorine content of chlorinated polyethylene is 35wt%-36wt%, ensuring a high degree of polarity matching with that of polyvinyl chloride, significantly improving the compatibility of the blend system and avoiding phase separation, internal defects, and other problems caused by chlorine content deviating from the reasonable range, which would lead to a decrease in the material's corrosion resistance. The melt viscosity of chlorinated polyethylene at 2400 Pa·s ensures a good match between the processing fluidity of chlorinated polyethylene and polyvinyl chloride, ensuring thorough mixing and uniform dispersion of all components during sheath layer preparation, avoiding component agglomeration and processing defects caused by melt viscosity mismatch. By matching and synergizing the key performance parameters of polyvinyl chloride (PVC) and chlorinated polyethylene (CPE) in terms of degree of polymerization, chlorine content, and melt viscosity, the thermodynamic stability and processing stability of the blended system are achieved. This enables the construction of a dense sheath substrate without internal defects, blocking the intrusion path of corrosive media and effectively improving the corrosion resistance of low-voltage cables. Detailed Implementation

[0031] 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.

[0032] Unless otherwise specified, the following embodiments and comparative examples are as follows: Polyvinyl chloride: Model S-1000, average degree of polymerization 1020; Chlorinated polyethylene: model CPE 6000, chlorine content 35wt%, melt viscosity 2400Pa·s; Ethylene-vinyl acetate copolymer: Model number EVA 28-40, brand name Arkema; Calcium carbonate: average particle size is 325 mesh; Calcium-zinc composite stabilizer: Model MC 9700 KA / 1; Maleic anhydride-grafted EVA: Model number 30E905.

[0033] Example 1 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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, 10 parts of chlorinated polyethylene, 15 parts of ethylene-vinyl acetate copolymer, 25 parts of calcium carbonate, and 10 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:3:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0034] Example 2 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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, 12 parts of chlorinated polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0035] Example 3 A corrosion-resistant low-voltage cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts polyvinyl chloride, 15 parts chlorinated polyethylene, 20 parts ethylene-vinyl acetate copolymer, 30 parts calcium carbonate, and 15 parts additives. The additives consist of antioxidant 1010, dioctyl sebacate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:5:1:3. The chlorine content of the chlorinated polyethylene is 36 wt%, and the melt viscosity is 2400 Pa·s. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0036] Example 4 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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 (model QS-1050P, average degree of polymerization 1050), 12 parts of chlorinated polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0037] Example 5 The preparation method of composite calcium carbonate includes the following steps: 4 parts of 3-chloropropyltrimethoxysilane are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate. Compared with Example 4, in this example, calcium carbonate is replaced with an equal amount of composite calcium carbonate prepared by the above preparation method.

[0038] Example 6 Compared with Example 5, in this example, the preparation method of composite calcium carbonate includes the following steps: 4 parts of 4-(chloromethyl)phenyltrimethoxysilane are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate.

[0039] Example 7 Compared with Example 5, in this example, the preparation method of composite calcium carbonate includes the following steps: 5 parts of 3-chloropropyltrimethoxysilane are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate.

[0040] Example 8 Compared with Example 5, in this example, the preparation method of composite calcium carbonate includes the following steps: 4 parts of chlorotrimethoxysilane compound (composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1:2.5) are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate.

[0041] Example 9 Compared with Example 5, in this example, the preparation method of composite calcium carbonate includes the following steps: 4 parts of chlorotrimethoxysilane compound (composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1.2:2.5) are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate.

[0042] Example 10 Compared with Example 5, in this example, the preparation method of composite calcium carbonate includes the following steps: 4 parts of chlorotrimethoxysilane compound (composed of 2-(chloromethyl)propenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1.2:2.5) are dispersed in 300 parts of solvent (composed of anhydrous ethanol and water in a mass ratio of 5:1), 50 parts of calcium carbonate are added, and the mixture is dried after 4 hours to obtain composite calcium carbonate.

[0043] Comparative Example 1 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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 (model S-700, average degree of polymerization 700), 12 parts of chlorinated polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0044] Comparative Example 2 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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 (model P-1300, average degree of polymerization 1300), 12 parts of chlorinated polyethylene, 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0045] Comparative Example 3 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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, 12 parts of chlorinated polyethylene (model CPE 3611E, chlorine content of 36wt%, melt viscosity of 800Pa·s), 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0046] Comparative Example 4 A corrosion-resistant low-voltage cable comprises, from the inside out, a 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, 12 parts of chlorinated polyethylene (model CPE 7000, chlorine content of 35wt%, melt viscosity of 2900Pa·s), 18 parts of ethylene-vinyl acetate copolymer, 28 parts of calcium carbonate, and 12 parts of additives. The additives are composed of antioxidant 1010, dioctyl adipate, calcium-zinc composite stabilizer, and maleic anhydride-grafted EVA in a mass ratio of 1:4:1:3. A method for preparing a corrosion-resistant low-voltage cable includes the following steps: S1. Extruding cross-linked polyethylene insulation material onto the outside of a copper conductor to obtain a semi-finished product; S2. After mixing the raw materials for the sheath layer, extrude them onto the outside of the semi-finished product to obtain a corrosion-resistant low-voltage cable.

[0047] Experimental Example 1 The sheaths of the corrosion-resistant low-voltage cables prepared in Examples 1-4 and Comparative Examples 1-4 were immersed in a 30% hydrochloric acid solution for 72 hours. The tensile strength was tested according to the test method in GB / T 1040.2-2022. The tensile strength before and after the corrosion resistance test was tested, and the average value of 5 samples was taken as the result value. The test speed was 200 mm / min, and the sample type was 1A.

[0048] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-4 and Comparative Examples 1-4

[0049] As shown in Table 1, when the average degree of polymerization of polyvinyl chloride is 1020~1050, the chlorine content of chlorinated polyethylene is 35wt%~36wt%, and the melt viscosity is 2400Pa·s, the corrosion resistance of low-voltage cables can be improved.

[0050] Experimental Example 2 The sheath of the corrosion-resistant low-voltage cables prepared in Examples 4 to 10 was tested for tensile strength according to the test method in GB / T 1040.2-2022; the average value of 5 samples was used as the result value, the test speed was 200 mm / min, and the sample type was 1A.

[0051] The test results are shown in Table 2: Table 2 Performance test results of Examples 4-10

[0052] As shown in Table 2, the tensile strength of corrosion-resistant low-voltage cables can be improved when fillers treated with chlorotrimethoxysilane compounds are added. When the chlorotrimethoxysilane compound is composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane, the tensile strength of the resulting corrosion-resistant low-voltage cable is even higher.

[0053] 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 low-voltage cable, characterized in that, From the inside out, it comprises a conductor, an insulating layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 10-15 parts of chlorinated polyethylene, 15-20 parts of ethylene-vinyl acetate copolymer, 25-30 parts of filler, and 10-15 parts of additives. The average degree of polymerization of the polyvinyl chloride is 1020-1050, the chlorine content of the chlorinated polyethylene is 35wt%-36wt%, and the melt viscosity of the chlorinated polyethylene is 2400 Pa·s.

2. The corrosion-resistant low-voltage cable according to claim 1, characterized in that, The conductor is made of copper.

3. The corrosion-resistant low-voltage cable according to claim 1, characterized in that, The insulation layer is a cross-linked polyethylene insulation layer.

4. The corrosion-resistant low-voltage cable according to claim 1, characterized in that, The filler includes one or more of calcium carbonate, kaolin, and carbon black.

5. The corrosion-resistant low-voltage cable according to claim 1, characterized in that, The additives consist of antioxidants, plasticizers, stabilizers, and compatibilizers in a mass ratio of 1:3 to 5:1:

3.

6. The corrosion-resistant low-voltage cable according to claim 5, characterized in that, The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076; The plasticizer includes one or both of dioctyl adipate and dioctyl sebacate. The stabilizer includes one or more of calcium-zinc composite stabilizer, lead stearate, and dibutyltin dilaurate; The compatibilizer is maleic anhydride-grafted EVA.

7. A corrosion-resistant low-voltage cable according to claim 4, characterized in that, The filler is a composite filler, and the preparation method of the composite filler includes the following steps: dispersing a chlorotrimethoxysilane compound in a solvent, adding the filler, mixing and drying to obtain the composite filler.

8. A corrosion-resistant low-voltage cable according to claim 7, characterized in that, The chlorotrimethoxysilane compound includes one or both of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane.

9. A corrosion-resistant low-voltage cable according to claim 8, characterized in that, The chlorotrimethoxysilane compound is composed of 4-(chloromethyl)phenyltrimethoxysilane and 3-chloropropyltrimethoxysilane in a mass ratio of 1~1.2:2.

5.

10. A method for preparing a corrosion-resistant low-voltage cable, used to prepare the corrosion-resistant low-voltage cable according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Extruding the insulating layer material over the conductor to obtain a semi-finished product; S2. After mixing the raw materials of the sheath layer, the mixture is extruded onto the semi-finished product to obtain the corrosion-resistant low-voltage cable.

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