Corrosion-resistant overhead cable

Abstract

The invention relates to the technical field of cables, and provides a corrosion-resistant overhead cable which sequentially comprises a conductor, an insulating layer, a shielding layer, a lining layer and an outer sheath layer from inside to outside. The outer sheath layer comprises the following raw materials in parts by weight: 60-70 parts of polyethylene, 20-30 parts of an ethylene-vinyl acetate copolymer, 10-15 parts of polyphenylene sulfide, 25-35 parts of a flame retardant, 0.5-1 part of an antioxidant, 2-3 parts of a lubricant, 3-5 parts of a compatilizer and 15-25 parts of a rectorite / tungsten carbide composite material; the mass ratio of rectorite to tungsten carbide is (1: 9)-(9: 1). According to the technical scheme, the problem of poor corrosion resistance of the overhead cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a corrosion-resistant overhead cable. Background Art

[0002] In today's fast-developing modern society, the stable transmission of electricity and communications is of vital importance. As an important carrier for power transmission and communication signal transmission, overhead cables play an irreplaceable role in our daily life and economic development. With the acceleration of industrialization and the continuous advancement of urbanization, the laying scope of overhead cables is becoming more and more extensive. From remote mountainous areas to bustling cities, from humid coastal areas to dry inland deserts, overhead cables face a variety of natural environmental challenges. Under humid climatic conditions, moisture and salt in the air can easily cause rust and corrosion of the metal parts of the cables. The sea breeze in coastal areas carries a lot of salt, which accelerates the corrosion rate of cables. In addition, industrial pollution, acid rain, etc. can also cause serious corrosion damage to overhead cables. Corrosion not only reduces the mechanical strength of the cable, leading to safety accidents such as cable breakage, but also affects the transmission quality of electricity and communications, bringing great inconvenience to people's production and life. Therefore, the preparation of a corrosion-resistant overhead cable is a problem that needs to be solved at present. Summary of the invention

[0003] The invention provides a corrosion-resistant overhead cable, which solves the problem of poor corrosion resistance of the overhead cable in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a corrosion-resistant overhead cable, which comprises, from the inside to the outside, a conductor, an insulating layer, a shielding layer, an inner lining layer, and an outer sheath layer in sequence. The outer sheath layer comprises the following raw materials in parts by weight: 60 to 70 parts of polyethylene, 20 to 30 parts of ethylene-vinyl acetate copolymer, 10 to 15 parts of polyphenylene sulfide, 25 to 35 parts of flame retardant, 0.5 to 1 part of antioxidant, 2 to 3 parts of lubricant, 3 to 5 parts of compatibilizer, and 15 to 25 parts of rectorite / tungsten carbide composite material; the mass ratio of the rectorite to the tungsten carbide is 1:9 to 9:1.

[0005] As a further technical solution, the conductor is an aluminum wire; and / or the insulating layer is polyvinyl chloride; and / or the shielding layer is tinned copper wire; and / or the lining layer is a polyester film.

[0006] As a further technical solution, the mass ratio of the rectorite to the tungsten carbide is 1:2-3.

[0007] As a further technical solution, the rectorite is modified by a modifier, and the modifier includes hexadecyltrimethylammonium bromide and 1,4-diamino-2,5-divinylbenzene.

[0008] In the present invention, hexadecyltrimethylammonium bromide and 1,4-diamino-2,5-divinylbenzene are used to modify rectorite, thereby further improving the corrosion resistance and mechanical properties of the outer sheath layer.

[0009] As a further technical solution, the amount of the modifier added is 5% to 8% of the mass of the rectorite.

[0010] As a further technical solution, the mass ratio of the hexadecyltrimethylammonium bromide to the 1,4-diamino-2,5-divinylbenzene is 4-8:1.

[0011] As a further technical solution, the preparation method of rectorite includes the following steps: adding methanol to rectorite and mixing, adding hexadecyltrimethylammonium bromide for a first modification, adding 1,4-diamino-2,5-divinylbenzene for a second modification, and obtaining modified rectorite after drying.

[0012] As a further technical solution, the temperature of the first modification is 40-50°C, and the time of the first modification is 2-3h.

[0013] As a further technical solution, the temperature of the second modification is 40-50°C, and the time of the second modification is 2-3h.

[0014] As a further technical solution, the polyphenylene sulfide consists of a first polyphenylene sulfide and a second polyphenylene sulfide, and the first polyphenylene sulfide and the second polyphenylene sulfide have different melt viscosities.

[0015] In the present invention, the mechanical properties of the outer sheath layer are further improved by limiting the melt viscosities of the first polyphenylene sulfide and the second polyphenylene sulfide to be different.

[0016] As a further technical solution, the melt viscosity of the first polyphenylene sulfide is 380 Pa·s (310°C / 1000s), and the melt viscosity of the second polyphenylene sulfide is 240 Pa·s (310°C / 1000s).

[0017] As a further technical solution, the mass ratio of the first polyphenylene sulfide to the second polyphenylene sulfide is 1:5-9.

[0018] As a further technical solution, the flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide.

[0019] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant DLTP, and antioxidant 1076.

[0020] As a further technical solution, the lubricant includes one or more of paraffin, stearic acid, and calcium stearate.

[0021] As a further technical solution, the compatibilizer includes one or two of POE-g-MAH and PP-g-MAH.

[0022] The present invention also provides a method for preparing a corrosion-resistant overhead cable, comprising the following steps: S1. Twisting aluminum wires to obtain a conductor, and extruding polyvinyl chloride on the outside of the conductor to form an insulating layer; S2, weave tinned copper wire on the outside of the insulation layer to form a shielding layer; S3, wrapping the polyester film around the outer side of the shielding layer to form an inner lining layer; S4. After mixing the raw materials of the outer sheath layer, extrude it onto the outer side of the inner lining layer to obtain a corrosion-resistant overhead cable.

[0023] The working principle and beneficial effects of the present invention are: In the present invention, polyethylene is used as the base material of the outer sheath layer, and ethylene-vinyl acetate copolymer is added and used in combination therewith, so that the outer sheath layer has better performance, and polyphenylene sulfide and rectorite / tungsten carbide composite materials are added to improve the corrosion resistance of the outer sheath layer, thereby solving the problem of poor corrosion resistance of the outer sheath layer. DETAILED DESCRIPTION

[0024] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0025] In the following embodiments and comparative examples: Polyethylene, model: DMDA-8008H; Ethylene-vinyl acetate copolymer, model: 45LX; Model 1140A64 HD9100 polyphenylene sulfide, melt viscosity (310℃ / 1000s): 240Pa·s; Model 1140A1 HD9050 polyphenylene sulfide, melt viscosity (310℃ / 1000s): 380Pa·s; POE-g-MAH, model: N416; PP-g-MAH, model: F600; rectorite, particle size 325 mesh; tungsten carbide, particle size 50nm.

[0026] Example 1 A method for preparing a corrosion-resistant overhead cable comprises the following steps: S1. Twisting aluminum wires to obtain a conductor, and extruding polyvinyl chloride on the outside of the conductor to form an insulating layer; S2, weave tinned copper wire on the outside of the insulation layer to form a shielding layer; S3, wrapping the polyester film around the outer side of the shielding layer to form an inner lining layer; S4. Mix 60 parts of polyethylene, 20 parts of ethylene-vinyl acetate copolymer, 10 parts of polyphenylene sulfide 1140A1 HD9050, 25 parts of aluminum hydroxide, 0.5 parts of antioxidant 1010, 2 parts of paraffin wax, 3 parts of POE-g-MAH, and 15 parts of rectorite / tungsten carbide composite material, and extrude them on the outside of the inner lining layer to obtain a corrosion-resistant overhead cable.

[0027] The rectorite / tungsten carbide composite material is obtained by grinding and mixing rectorite and tungsten carbide in a mass ratio of 1:9.

[0028] Example 2 A method for preparing a corrosion-resistant overhead cable comprises the following steps: S1. Twisting aluminum wires to obtain a conductor, and extruding polyvinyl chloride on the outside of the conductor to form an insulating layer; S2, weave tinned copper wire on the outside of the insulation layer to form a shielding layer; S3, wrapping the polyester film around the outer side of the shielding layer to form an inner lining layer; S4. Mix 65 parts of polyethylene, 25 parts of ethylene-vinyl acetate copolymer, 12 parts of polyphenylene sulfide 1140A1 HD9050, 30 parts of magnesium hydroxide, 0.7 parts of antioxidant DLTP, 2 parts of stearic acid, 4 parts of POE-g-MAH, and 20 parts of rectorite / tungsten carbide composite material, and extrude them on the outside of the inner lining layer to obtain a corrosion-resistant overhead cable.

[0029] The rectorite / tungsten carbide composite material is obtained by grinding and mixing rectorite and tungsten carbide in a mass ratio of 1:1.

[0030] Example 3 A method for preparing a corrosion-resistant overhead cable comprises the following steps: S1. Twisting aluminum wires to obtain a conductor, and extruding polyvinyl chloride on the outside of the conductor to form an insulating layer; S2, weave tinned copper wire on the outside of the insulation layer to form a shielding layer; S3, wrapping the polyester film around the outer side of the shielding layer to form an inner lining layer; S4. Mix 70 parts of polyethylene, 30 parts of ethylene-vinyl acetate copolymer, 15 parts of polyphenylene sulfide 1140A1 HD9050, 35 parts of magnesium hydroxide, 1 part of antioxidant 1076, 3 parts of calcium stearate, 5 parts of PP-g-MAH, and 25 parts of rectorite / tungsten carbide composite material, and extrude them on the outside of the inner lining layer to obtain a corrosion-resistant overhead cable.

[0031] The rectorite / tungsten carbide composite material is obtained by grinding and mixing rectorite and tungsten carbide in a mass ratio of 9:1.

[0032] Example 4 The only difference between this embodiment and embodiment 1 is that the rectorite / tungsten carbide composite material is obtained by grinding and mixing rectorite and tungsten carbide in a mass ratio of 1:2.

[0033] Example 5 The only difference between this embodiment and embodiment 1 is that the rectorite / tungsten carbide composite material is obtained by grinding and mixing rectorite and tungsten carbide in a mass ratio of 1:3.

[0034] Example 6 The only difference between this embodiment and embodiment 4 is that the rectorite is replaced by an equal amount of modified rectorite.

[0035] The preparation method of modified rectorite comprises the following steps: adding 45g of rectorite into 400mL of methanol and mixing evenly, adding 2.7g of hexadecyltrimethylammonium bromide, heating to 40°C, stirring at the temperature for 6h, and drying to obtain the modified rectorite.

[0036] Example 7 The only difference between this embodiment and embodiment 6 is that hexadecyltrimethylammonium bromide is replaced by an equal amount of 1,4-diamino-2,5-divinylbenzene.

[0037] Example 8 The present embodiment is different from the embodiment 6 only in that the preparation method of the modified rectorite comprises the following steps: adding 45 g of rectorite to 400 mL of methanol and mixing evenly, adding 2.16 g of hexadecyltrimethylammonium bromide, heating to 40° C., stirring at this temperature for 3 h, then adding 0.54 g of 1,4-diamino-2,5-divinylbenzene, continuing to stir at 40° C. for 3 h, and obtaining the modified rectorite after drying.

[0038] Example 9 The only difference between this embodiment and embodiment 8 is that the amount of cetyltrimethylammonium bromide added is 2.4 g, and the amount of 1,4-diamino-2,5-divinylbenzene added is 0.3 g.

[0039] Example 10 The only difference between this embodiment and embodiment 9 is that polyphenylene sulfide 1140A1 HD9050 is replaced by an equal amount of polyphenylene sulfide 1140A64 HD9100.

[0040] Embodiment 11 The only difference between this embodiment and embodiment 9 is that the polyphenylene sulfide is composed of polyphenylene sulfide 1140A1 HD9050 and polyphenylene sulfide 1140A64 HD9100 in a mass ratio of 1:3.

[0041] Example 12 The only difference between this embodiment and Embodiment 11 is that the mass ratio of polyphenylene sulfide 1140A1 HD9050 to polyphenylene sulfide 1140A64 HD9100 is 1:10.

[0042] Embodiment 13 The only difference between this embodiment and embodiment 11 is that the mass ratio of polyphenylene sulfide 1140A1 HD9050 to polyphenylene sulfide 1140A64 HD9100 is 1:5.

[0043] Embodiment 14 The only difference between this embodiment and Embodiment 11 is that the mass ratio of polyphenylene sulfide 1140A1 HD9050 to polyphenylene sulfide 1140A64 HD9100 is 1:9.

[0044] Comparative Example 1 The only difference between this comparative example and Example 1 is that no polyphenylene sulfide is added.

[0045] Comparative Example 2 Compared with Example 1, in step S4, 60 parts of polyethylene, 20 parts of ethylene-vinyl acetate copolymer, 10 parts of polyphenylene sulfide 1140A1 HD9050, 25 parts of aluminum hydroxide, 0.5 parts of antioxidant 1010, 2 parts of paraffin, 3 parts of POE-g-MAH, 13.5 parts of rectorite and 1.5 parts of tungsten carbide are mixed and extruded on the outside of the inner lining layer to obtain a corrosion-resistant overhead cable.

[0046] The outer sheath layers prepared in Examples 1 to 14 and Comparative Examples 1 to 2 were respectively tested for tensile strength according to the determination method in GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables Part 11: General Test Methods for Thickness and Dimension Measurement Mechanical Properties Test", and then immersed in a 40 g / L sodium hydroxide solution for 10 days, and then the change rate of tensile strength was tested; Tensile strength change rate = (tensile strength after immersion / tensile strength before immersion-1) × 100%; The test results are shown in Table 1.

[0047] Table 1 Performance test results of Examples 1 to 14 and Comparative Examples 1 to 2

[0048] Compared with Example 1, no polyphenylene sulfide was added in Comparative Example 1, and rectorite and tungsten carbide were not compounded in Comparative Example 2. As a result, the tensile strength and tensile strength change rate of the outer sheath layer in Comparative Examples 1 and 2 were lower than those in Example 1, indicating that adding polyphenylene sulfide and rectorite / tungsten carbide composite materials to the outer sheath layer can improve the tensile strength and corrosion resistance of the outer sheath layer.

[0049] Compared with Example 1, the mass ratio of rectorite and tungsten carbide was changed in Examples 4 to 5. As a result, the change rate of the tensile strength of the outer sheath layer in Examples 4 to 5 was higher than that in Example 1, indicating that when the mass ratio of rectorite and tungsten carbide was 1:2 to 3, the corrosion resistance of the outer sheath layer could be improved.

[0050] Compared with Example 4, in Examples 6 to 9, a modifier was added to modify the rectorite. As a result, the tensile strength and tensile strength change rate of the outer sheath layer prepared in Examples 8 to 9 were higher than those in Examples 6 to 7, indicating that when hexadecyltrimethylammonium bromide and 1,4-diamino-2,5-divinylbenzene were used to modify the rectorite at the same time, and the mass ratio of hexadecyltrimethylammonium bromide to 1,4-diamino-2,5-divinylbenzene was 4 to 8:1, the tensile strength and corrosion resistance of the outer sheath layer could be further improved.

[0051] Compared with Example 9, Examples 10 to 14 changed the composition of polyphenylene sulfide. As a result, the tensile strength of the outer sheath layer prepared in Examples 13 to 14 was higher than that in Examples 9 to 12, indicating that when polyphenylene sulfide is composed of polyphenylene sulfide 1140A1 HD9050 and polyphenylene sulfide 1140A64 HD9100, and the mass ratio of polyphenylene sulfide 1140A1 HD9050 to polyphenylene sulfide 1140A64 HD9100 is 5 to 9:1, the tensile strength of the outer sheath layer can be further improved.

[0052] The above are only 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 in the protection scope of the present invention.

Claims

1. A corrosion-resistant overhead cable, characterized in that: The invention comprises, from the inside to the outside, a conductor, an insulating layer, a shielding layer, an inner lining layer and an outer sheath layer. The outer sheath layer comprises the following raw materials in parts by weight: 60 to 70 parts of polyethylene, 20 to 30 parts of ethylene-vinyl acetate copolymer, 10 to 15 parts of polyphenylene sulfide, 25 to 35 parts of flame retardant, 0.5 to 1 part of antioxidant, 2 to 3 parts of lubricant, 3 to 5 parts of compatibilizer and 15 to 25 parts of rectorite / tungsten carbide composite material; the mass ratio of the rectorite to the tungsten carbide is 1:9 to 9:

1.

2. The corrosion-resistant overhead cable according to claim 1, characterized in that: The mass ratio of the rectorite to the tungsten carbide is 1:2-3.

3. The corrosion-resistant overhead cable according to claim 1, characterized in that: The rectorite is modified by a modifier, and the modifier includes hexadecyltrimethylammonium bromide and 1,4-diamino-2,5-divinylbenzene.

4. The corrosion-resistant overhead cable according to claim 3, characterized in that: The mass ratio of the hexadecyltrimethylammonium bromide to the 1,4-diamino-2,5-divinylbenzene is 4-8:

1.

5. The corrosion-resistant overhead cable according to claim 1, characterized in that: The polyphenylene sulfide consists of a first polyphenylene sulfide and a second polyphenylene sulfide, and the first polyphenylene sulfide and the second polyphenylene sulfide have different melt viscosities.

6. The corrosion-resistant overhead cable according to claim 5, characterized in that: The melt viscosity of the first polyphenylene sulfide is 380 Pa·s (310° C. / 1000 s), and the melt viscosity of the second polyphenylene sulfide is 240 Pa·s (310° C. / 1000 s).

7. The corrosion-resistant overhead cable according to claim 5, characterized in that: The mass ratio of the first polyphenylene sulfide to the second polyphenylene sulfide is 1:5-9.

8. The corrosion-resistant overhead cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant DLTP, and antioxidant 1076 .

9. The corrosion-resistant overhead cable according to claim 1, characterized in that: The lubricant includes one or more of paraffin, stearic acid, and calcium stearate.

10. The corrosion-resistant overhead cable according to claim 1, characterized in that: The compatibilizer includes one or two of POE-g-MAH and PP-g-MAH.

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