Anti-aging overhead insulated wire

Abstract

The invention relates to the technical field of overhead conductors, and provides an anti-aging overhead insulated conductor which sequentially comprises a wire core, a shielding layer and a protective layer from inside to outside. The wire core is composed of a conductor and an insulating layer wrapping the outer side of the conductor, and the conductor is formed by twisting a plurality of aluminum alloy wires. According to the technical scheme, the problem of insufficient aging resistance of the overhead insulated wire in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of overhead conductor technology, specifically to an anti-aging overhead insulated conductor. Background Technology

[0002] Overhead insulated conductors, as the main carrier of power distribution network lines, are widely used in urban and rural power distribution networks, industrial park power supply and rail transit and other power transmission fields. However, with the continuous growth of power grid load, the increasing complexity of the operating environment and the continuous improvement of power supply reliability requirements, higher requirements are put forward for the performance of overhead insulated conductors.

[0003] Currently, the protective layer of overhead insulated conductors is easily affected by ultraviolet radiation during operation, leading to aging of the protective layer and subsequent problems such as embrittlement and cracking. This not only shortens the service life of overhead insulated conductors but also increases the risk of leakage and short circuits during power transmission. Therefore, it is of great significance to develop overhead insulated conductors with excellent anti-aging properties. Summary of the Invention

[0004] This invention proposes an anti-aging overhead insulated conductor, which solves the problem of insufficient anti-aging properties of overhead insulated conductors in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes an anti-aging overhead insulated conductor, which consists of a conductor core, a shielding layer, and a protective layer from the inside out; the conductor core is composed of a conductor and an insulating layer covering the outside of the conductor, and the conductor is made of multiple aluminum alloy wires twisted together.

[0006] As a further technical solution, the insulation layer is a cross-linked polyethylene insulation layer.

[0007] As a further technical solution, the shielding layer is a metal shielding layer.

[0008] As a further technical solution, the metal shielding layer is a copper wire braided shielding layer.

[0009] As a further technical solution, the raw materials of the protective layer include the following components by weight: 100 parts of EPDM rubber, 20-30 parts of polypropylene, 3-5 parts of zinc oxide, 2-5 parts of antioxidant, 15-25 parts of modified titanium dioxide, 4-6 parts of lubricant, 4-6 parts of vulcanizing agent, and 1-3 parts of crosslinking aid. The modified titanium dioxide is obtained by modifying titanium dioxide with methyl 4-aminomethylbenzoate hydrochloride.

[0010] This invention improves the aging resistance of the protective layer of overhead insulated conductors by adding titanium dioxide modified with methyl 4-aminomethylbenzoate hydrochloride. While titanium dioxide has aging resistance, its high surface energy and tendency to agglomerate make it difficult to disperse evenly in the EPDM and polypropylene blend matrix, thus hindering its full aging resistance. However, the amino groups in the methyl 4-aminomethylbenzoate hydrochloride molecular structure can form hydrogen bonds with the hydroxyl groups on the surface of titanium dioxide particles, effectively reducing agglomeration and improving its dispersibility in the EPDM and polypropylene blend matrix, thereby enhancing the aging resistance of the protective layer.

[0011] As a further technical solution, the mass ratio of titanium dioxide to methyl 4-aminomethylbenzoate hydrochloride is 100:5~7, preferably 50:3.

[0012] As a further technical solution, the modified titanium dioxide is prepared as follows: 4-aminomethylbenzoate hydrochloride is dispersed evenly in a solvent, then added to the titanium dioxide and mixed, and then filtered and dried to obtain modified titanium dioxide.

[0013] As a further technical solution, the solvent is water.

[0014] As a further technical solution, the mixing temperature is 60~80℃, and the mixing time is 1~3h.

[0015] As a further technical solution, the polypropylene is composed of a first polypropylene and a second polypropylene, wherein the melt mass flow rates of the first polypropylene and the second polypropylene are different.

[0016] As a further technical solution, the melt flow rate of the first polypropylene is 18 g / 10 min, and the test conditions are 230℃ and 2.16 kg; the melt flow rate of the second polypropylene is 7 g / 10 min, and the test conditions are 230℃ and 2.16 kg.

[0017] This invention improves the mechanical properties of the anti-aging overhead insulated conductor protective layer by compounding a first polypropylene with a melt flow rate of 18 g / 10 min and a second polypropylene with a melt flow rate of 7 g / 10 min. The first polypropylene has a higher melt flow rate and better fluidity, which can significantly improve the processing and molding performance of the material and ensure that the components are uniformly mixed and form a continuous and dense matrix. The second polypropylene has a lower melt flow rate and a relatively higher molecular weight, which enhances the interaction and entanglement density between molecular chains. The compounding of the first and second polypropylenes not only ensures good processing and molding performance, but also strengthens the structural integrity, thereby improving the mechanical properties of the protective layer.

[0018] As a further technical solution, the mass ratio of the first polypropylene and the second polypropylene is 4:5~7, preferably 2:3.

[0019] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168.

[0020] As a further technical solution, the lubricant includes one or more of calcium stearate, microcrystalline wax, and pentaerythritol stearate.

[0021] As a further technical solution, the vulcanizing agent includes dicumyl peroxide.

[0022] As a further technical solution, the crosslinking aid includes triallyl isocyanurate.

[0023] The working principle and beneficial effects of this invention are as follows: This invention provides an anti-aging overhead insulated conductor, which consists of a conductor core, a shielding layer, and a protective layer arranged sequentially from the inside out, forming a multi-layered protective structure. The conductor core is made of multiple strands of aluminum alloy wire, which improves the flexibility and mechanical strength of the core, ensuring stable power transmission. This, combined with the insulation layer, provides insulation protection and ensures stable power transmission. The shielding layer eliminates electric field concentration, resists electromagnetic interference, and prevents external signals from affecting transmission. The protective layer has excellent anti-aging properties, extending the conductor's service life. All layers work together to achieve both anti-aging properties and reliable transmission performance. Detailed Implementation

[0024] 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.

[0025] In the following embodiments: Ethylene propylene diene monomer (EPDM) rubber, model: 4725P; manufacturer: Dow Chemical Company, USA; The first polypropylene melt flow rate was 18 g / 10 min, the test conditions were 230℃ and 2.16 kg, model: J-560M, manufacturer: Lotte Chemical Co., Ltd. of South Korea. The melt flow rate of the second polypropylene was 7 g / 10 min, and the test conditions were 230℃ and 2.16 kg. The model was FC-750R and the manufacturer was Lotte Chemical Co., Ltd. of South Korea. Titanium dioxide, average particle size: 0.4μm.

[0026] Example 1 An anti-aging overhead insulated conductor comprises, from the inside out, a conductor core, a shielding layer, and a protective layer; wherein the raw materials of the protective layer include the following components by weight: 100 parts EPDM rubber, 20 parts polypropylene, 3 parts zinc oxide, 2 parts antioxidant 1010, 15 parts modified titanium dioxide, 4 parts calcium stearate, 4 parts dicumyl peroxide, and 1 part triallyl isocyanurate, wherein the polypropylene is the first polypropylene; The modified titanium dioxide is prepared as follows: 4-aminomethylbenzoate hydrochloride is evenly dispersed in water, titanium dioxide is added and mixed at 60℃ for 3 hours, and then filtered and dried to obtain modified titanium dioxide. The mass-volume ratio of titanium dioxide to water is 1g:10mL, and the mass ratio of titanium dioxide to 4-aminomethylbenzoate hydrochloride is 20:1. A method for preparing an anti-aging overhead insulated conductor includes the following steps: S1. Extruding cross-linked polyethylene material onto the outside of a conductor made of 14 stranded aluminum alloy wires to form an insulation layer, thus obtaining the wire core; S2. Braid the copper wire material onto the outside of the core to form a copper wire braided shielding layer; S3. After the raw materials for the protective layer are mixed evenly, they are extruded onto the outside of the shielding layer and vulcanized to form a protective layer, thus obtaining an anti-aging overhead insulated conductor.

[0027] Example 2 An anti-aging overhead insulated conductor comprises, from the inside out, a conductor core, a shielding layer, and a protective layer; wherein the protective layer is made of the following components by weight: 100 parts EPDM rubber, 25 parts polypropylene, 4 parts zinc oxide, 4 parts antioxidant 1010, 20 parts modified titanium dioxide, 5 parts calcium stearate, 5 parts dicumyl peroxide, and 2 parts triallyl isocyanurate, wherein the polypropylene is the first polypropylene; The modified titanium dioxide is prepared as follows: 4-aminomethylbenzoate hydrochloride is dispersed evenly in water, titanium dioxide is added and mixed at 70℃ for 2 hours, and then filtered and dried to obtain modified titanium dioxide. The mass-volume ratio of titanium dioxide to water is 1g:10mL, and the mass ratio of titanium dioxide to 4-aminomethylbenzoate hydrochloride is 20:1. A method for preparing an anti-aging overhead insulated conductor includes the following steps: S1. Extruding cross-linked polyethylene material onto the outside of a conductor made of 14 stranded aluminum alloy wires to form an insulation layer, thus obtaining the wire core; S2. Braid the copper wire material onto the outside of the core to form a copper wire braided shielding layer; S3. After the raw materials for the protective layer are mixed evenly, they are extruded onto the outside of the shielding layer and vulcanized to form a protective layer, thus obtaining an anti-aging overhead insulated conductor.

[0028] Example 3 An anti-aging overhead insulated conductor comprises, from the inside out, a conductor core, a shielding layer, and a protective layer; wherein the raw materials of the protective layer include the following components by weight: 100 parts EPDM rubber, 30 parts polypropylene, 5 parts zinc oxide, 5 parts antioxidant 1010, 25 parts modified titanium dioxide, 6 parts calcium stearate, 6 parts dicumyl peroxide, and 3 parts triallyl isocyanurate, wherein the polypropylene is the first polypropylene; The modified titanium dioxide is prepared as follows: 4-aminomethylbenzoate hydrochloride is dispersed evenly in water, titanium dioxide is added and mixed at 80℃ for 1 hour, and then filtered and dried to obtain modified titanium dioxide. The mass-volume ratio of titanium dioxide to water is 1g:10mL, and the mass ratio of titanium dioxide to 4-aminomethylbenzoate hydrochloride is 20:1. A method for preparing an anti-aging overhead insulated conductor includes the following steps: S1. Extruding cross-linked polyethylene material onto the outside of a conductor made of 14 stranded aluminum alloy wires to form an insulation layer, thus obtaining the wire core; S2. Braid the copper wire material onto the outside of the core to form a copper wire braided shielding layer; S3. After the raw materials for the protective layer are mixed evenly, they are extruded onto the outside of the shielding layer and vulcanized to form a protective layer, thus obtaining an anti-aging overhead insulated conductor.

[0029] Example 4 The only difference between this embodiment and Embodiment 2 is that the mass ratio of titanium dioxide to methyl 4-aminomethylbenzoate hydrochloride in this embodiment is 50:3.

[0030] Example 5 The only difference between this embodiment and Embodiment 2 is that the mass ratio of titanium dioxide to methyl 4-aminomethylbenzoate hydrochloride in this embodiment is 100:7.

[0031] Example 6 The only difference between this embodiment and Embodiment 2 is that the polypropylene in this embodiment is a second type of polypropylene.

[0032] Example 7 The only difference between this embodiment and Embodiment 2 is that in this embodiment, the polypropylene is composed of a first polypropylene and a second polypropylene with a mass ratio of 4:5.

[0033] Example 8 The only difference between this embodiment and Embodiment 2 is that in this embodiment, the polypropylene is composed of a first polypropylene and a second polypropylene with a mass ratio of 2:3.

[0034] Example 9 The only difference between this embodiment and Embodiment 2 is that in this embodiment, the polypropylene is composed of a first polypropylene and a second polypropylene with a mass ratio of 4:7.

[0035] Example 10 The only difference between this embodiment and Embodiment 1 is that the modified titanium dioxide is replaced with an equal amount of titanium dioxide in this embodiment.

[0036] Example 11 The only difference between this embodiment and Embodiment 1 is that methyl 4-aminomethylbenzoate hydrochloride is replaced with an equal amount of silane coupling agent KH-550 in this embodiment.

[0037] Test case The protective layers of the anti-aging overhead insulated conductors obtained in Examples 1-11 were tested in the following manner: Mechanical properties: Tensile strength was tested according to GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Cables - Part 11: General Test Methods - Thickness and Dimensional Measurements - Mechanical Properties Tests". The test specimen was a dumbbell specimen with a thickness of 1.5 mm and a moving speed of 25 mm / min. Then, ultraviolet aging test was conducted according to GB / T 16585-1996 "Artificial Weathering (Fluorescent Ultraviolet Lamp) Test Method for Vulcanized Rubber". A UV-B lamp was used, and the ultraviolet light exposure time was 7 days. Tensile strength was measured again after ultraviolet lamp aging. The test results are shown in Tables 1 and 2 below.

[0038] Table 1 Performance test results of Examples 1-5 and Examples 10-11

[0039] The tensile strength of the protective layer in Examples 1-5 is higher than that in Examples 10-11. The tensile strength of the protective layer after UV aging in Examples 1-5 is higher than that in Examples 10-11. This indicates that the present invention improves the aging resistance of the protective layer of overhead insulated conductors by adding titanium dioxide modified with methyl 4-aminomethylbenzoate hydrochloride to the protective layer.

[0040] Table 2 Performance test results of Examples 2 and 6-9

[0041] The tensile strength of Examples 7-9 is higher than that of Examples 2 and 6, indicating that the present invention improves the tensile strength of the anti-aging overhead insulated conductor protective layer by adding a first polypropylene with a melt flow rate of 18 g / 10 min and a second polypropylene with a melt flow rate of 7 g / 10 min.

[0042] 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. An anti-aging overhead insulated conductor, characterized in that, From the inside out, the components are: wire core, shielding layer, and protective layer. The wire core consists of a conductor and an insulating layer covering the outside of the conductor. The conductor is made of multiple strands of aluminum alloy wire.

2. The anti-aging overhead insulated conductor according to claim 1, characterized in that, The insulation layer is a cross-linked polyethylene insulation layer.

3. The anti-aging overhead insulated conductor according to claim 1, characterized in that, The shielding layer is a metal shielding layer.

4. The anti-aging overhead insulated conductor according to claim 3, characterized in that, The metal shielding layer is a copper wire braided shielding layer.

5. The anti-aging overhead insulated conductor according to claim 1, characterized in that, The raw materials of the protective layer include the following components by weight: 100 parts of EPDM rubber, 20-30 parts of polypropylene, 3-5 parts of zinc oxide, 2-5 parts of antioxidant, 15-25 parts of modified titanium dioxide, 4-6 parts of lubricant, 4-6 parts of vulcanizing agent, and 1-3 parts of crosslinking aid. The modified titanium dioxide is obtained by modifying titanium dioxide with methyl 4-aminomethylbenzoate hydrochloride.

6. The anti-aging overhead insulated conductor according to claim 5, characterized in that, The mass ratio of titanium dioxide to methyl 4-aminomethylbenzoate hydrochloride is 100:5~7.

7. The anti-aging overhead insulated conductor according to claim 5, characterized in that, The modified titanium dioxide is prepared as follows: 4-aminomethylbenzoate hydrochloride is dispersed evenly in a solvent, then added to the titanium dioxide and mixed. After filtration and drying, the modified titanium dioxide is obtained.

8. The anti-aging overhead insulated conductor according to claim 7, characterized in that, The mixing temperature is 60~80℃, and the mixing time is 1~3h.

9. The anti-aging overhead insulated conductor according to claim 5, characterized in that, The polypropylene is composed of a first polypropylene and a second polypropylene, wherein the first polypropylene and the second polypropylene have different melt mass flow rates.

10. The anti-aging overhead insulated conductor according to claim 9, characterized in that, The melt flow rate of the first polypropylene was 18 g / 10 min, and the test conditions were 230 °C and 2.16 kg; the melt flow rate of the second polypropylene was 7 g / 10 min, and the test conditions were 230 °C and 2.16 kg.

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