High-temperature-resistant aerial cable

Abstract

The invention relates to the technical field of cables, and provides a high-temperature-resistant aerial cable which sequentially comprises a cable core, an insulating layer and a protective layer from inside to outside. The protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 15-25 parts of an acrylonitrile-styrene-acrylate copolymer, 8-18 parts of epoxy resin, 20-30 parts of PBO fibers, 15-25 parts of serpentine, 30-40 parts of a flame retardant, 1-3 parts of a first antioxidant, 1-3 parts of a first plasticizer, 1-2 parts of a lubricant and 1-5 parts of a compatilizer. According to the technical scheme, the problems of poor tensile strength and poor high-temperature resistance of an overhead cable protection layer in the prior art are solved.

Description

Technical Field

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

[0002] Overhead cables are a wiring method that uses supports such as poles to erect cables at a certain height above the ground for power or signal transmission. They are overhead wires equipped with insulation and protective layers. Overhead cables are widely used in power transmission, especially for long-distance, large-capacity power transmission. In areas with complex terrain, such as mountains and hills, overhead cables can cross obstacles such as valleys and rivers to provide power supply to remote areas, and are a key part of building power networks.

[0003] Overhead cables are operated in the external environment and will be affected by various factors such as wind and external gravity for a long time. In order to ensure the normal operation of overhead cables, the market has strict requirements on the tensile strength of the overhead cable protective layer. In addition, in some special areas, such as deserts and tropical areas, long-term high temperature environments will cause overhead cables to be in a high temperature state for a long time. At present, the high temperature resistance and tensile strength of the overhead cable protective layer are poor, which is difficult to meet the needs of long-term operation. Therefore, improving the tensile strength and high temperature resistance of the overhead cable protective layer is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The invention provides a high temperature resistant overhead cable, which solves the problems of poor tensile strength and poor high temperature resistance of the protective layer of the overhead cable in the related art.

[0005] The technical solution of the present invention is as follows: The present invention provides a high temperature resistant overhead cable, which comprises a cable core, an insulating layer and a protective layer from the inside to the outside, wherein the protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 15-25 parts of acrylonitrile-styrene-acrylate copolymer, 8-18 parts of epoxy resin, 20-30 parts of PBO fiber, 15-25 parts of serpentine, 30-40 parts of flame retardant, 1-3 parts of first antioxidant, 1-3 parts of first plasticizer, 1-2 parts of lubricant, and 1-5 parts of compatibilizer.

[0006] As a further technical solution, the PBO fiber is a modified PBO fiber, and the raw materials of the modified PBO fiber include PBO fiber and polyvinyl acetate.

[0007] By modifying the PBO fiber with polyvinyl acetate, the PBO fiber is evenly dispersed in the protective layer mixing system, and the interaction between the PBO fiber and other components is strengthened, thereby further improving the tensile strength and high temperature resistance of the overhead cable protective layer.

[0008] As a further technical solution, the weight ratio of the PBO fiber to polyvinyl acetate is 7-23:1.

[0009] When the weight ratio of PBO fiber to polyvinyl acetate is 7~23:1, the tensile strength and high temperature resistance of the overhead cable protective layer can be further improved.

[0010] As a further technical solution, the preparation method of the modified PBO fiber includes the following steps: dissolving the polyvinyl acetate in acetone to obtain a polyvinyl acetate solution, adding the PBO fiber to the polyvinyl acetate solution, dispersing it evenly, and drying it to obtain the modified PBO fiber.

[0011] As a further technical solution, the mass fraction of the polyvinyl acetate solution is 4% to 10%.

[0012] As a further technical solution, the raw material of the modified PBO fiber also includes p-aminobenzamide.

[0013] The inventors found that in the process of modifying PBO fiber, adding p-aminobenzamide and using p-aminobenzamide and polyvinyl acetate to simultaneously modify the surface of PBO fiber can further improve the tensile strength and high temperature resistance of the protective layer of the overhead cable. The reason may be that the addition of p-aminobenzamide can further increase the combination of PBO fiber and other components, thereby making the internal structure of the insulation layer more compact, thereby further improving the tensile strength and high temperature resistance of the protective layer of the overhead cable.

[0014] As a further technical solution, the weight ratio of the PBO fiber, p-aminobenzamide and polyvinyl acetate is 14-22:1:1.

[0015] When the weight ratio of PBO fiber, p-aminobenzamide and polyvinyl acetate is 14~22:1:1, the tensile strength and high temperature resistance of the overhead cable protective layer can be further improved.

[0016] As a further technical solution, the preparation method of the modified PBO fiber includes the following steps: dissolving the polyvinyl acetate and the p-aminobenzamide in acetone to obtain a mixed solution, adding the PBO fiber to the mixed solution, dispersing evenly, and drying to obtain the modified PBO fiber.

[0017] As a further technical solution, the mass fraction of the mixed solution is 5% to 12%.

[0018] As a further technical solution, the insulating layer comprises the following components in parts by weight: 65 parts of polyethylene, 15-25 parts of acrylonitrile-styrene-acrylate copolymer, 10-15 parts of EPDM rubber, 1-3 parts of a second antioxidant, and 1-3 parts of a second plasticizer.

[0019] As a further technical solution, the cable core is made of aluminum alloy or copper alloy.

[0020] As a further technical solution, the first antioxidant and the second antioxidant are independently one or more of antioxidant 1010, antioxidant 300, and antioxidant 1076.

[0021] As a further technical solution, the first plasticizer and the second plasticizer are independently one or more of dicyclohexyl phthalate, diisodecyl phthalate, and dibutyl phthalate.

[0022] As a further technical solution, the lubricant is one or both of polyethylene wax and sodium stearate.

[0023] As a further technical solution, the compatibilizer is one or two of HDPE-g-MAH and ABS-g-MAH.

[0024] As a further technical solution, the flame retardant is one or both of magnesium hydroxide and aluminum hydroxide.

[0025] The present invention also provides a method for preparing the high temperature resistant overhead cable, comprising the following steps: S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer mixture; S2, blending the components of the insulating layer in parts by weight, and extruding to obtain an insulating layer mixture; S3, coating the insulating layer mixture on the surface of the cable core to obtain a cable core with an outer insulating layer; S4, coating the protective layer mixture on the surface of the cable core containing the outer insulating layer to obtain an overhead cable.

[0026] As a further technical solution, in step S1, the temperature during extrusion is 170-190°C; in step S2, the temperature during extrusion is 170-190°C.

[0027] The working principle and beneficial effects of the present invention are: In the present invention, PBO fiber is introduced into the protective layer of the overhead cable. The PBO fiber and other components are used in combination, so that the protective layer of the overhead cable has good tensile strength and can also improve its high temperature resistance. In addition, the addition of serpentine can also improve the tensile strength and high temperature resistance of the protective layer of the overhead cable. DETAILED DESCRIPTION

[0028] 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.

[0029] In the following embodiments and comparative examples, polyethylene is high-density polyethylene, model M80064; the model of acrylonitrile-styrene-acrylate copolymer is XC-500A; the model of epoxy resin is CYD-012; the length of PBO fiber is 3 mm, the article number is TD240814, and the manufacturer is Hubei Tengdi New Materials Co., Ltd.; the particle size of serpentine is 400 mesh; the model of polyvinyl acetate is XH-018; the compatibilizer is HDPE-g-MAH, model TY1352; the model of EPDM rubber is J-3092E; the cable core is aluminum alloy and the material is AA8030.

[0030] Example 1 A high temperature resistant overhead cable comprises a cable core, an insulating layer and a protective layer from the inside to the outside, wherein the protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 15 parts of acrylonitrile-styrene-acrylate copolymer, 8 parts of epoxy resin, 20 parts of PBO fiber, 15 parts of serpentine, 30 parts of magnesium hydroxide, 1 part of antioxidant 1076, 1 part of diisodecyl phthalate, 1 part of sodium stearate, 1 part of HDPE-g-MAH; The insulating layer includes the following components in parts by weight: 65 parts of polyethylene, 15 parts of acrylonitrile-styrene-acrylate copolymer, 10 parts of EPDM rubber, 1 part of antioxidant 1076, 1 part of diisodecyl phthalate; The preparation method thereof comprises the following steps: S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S2, blending and extruding the components of the insulating layer in parts by weight to obtain an insulating layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S3, coating the insulating layer mixture on the surface of the cable core to obtain a cable core with an outer insulating layer; S4. Coat the protective layer mixture on the surface of the cable core having an outer insulating layer to obtain an overhead cable.

[0031] Example 2 A high temperature resistant overhead cable comprises a cable core, an insulating layer and a protective layer from the inside to the outside, wherein the protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 20 parts of acrylonitrile-styrene-acrylate copolymer, 13 parts of epoxy resin, 24 parts of PBO fiber, 20 parts of serpentine, 35 parts of aluminum hydroxide, 2 parts of antioxidant 1076, 2 parts of diisodecyl phthalate, 1.5 parts of sodium stearate, 3 parts of HDPE-g-MAH; The insulating layer includes the following components in parts by weight: 65 parts of polyethylene, 20 parts of acrylonitrile-styrene-acrylate copolymer, 13 parts of EPDM rubber, 2 parts of antioxidant 1076, 2 parts of diisodecyl phthalate; The preparation method thereof comprises the following steps: S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S2, blending and extruding the components of the insulating layer in parts by weight to obtain an insulating layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S3, coating the insulating layer mixture on the surface of the cable core to obtain a cable core with an outer insulating layer; S4. Coat the protective layer mixture on the surface of the cable core having an outer insulating layer to obtain an overhead cable.

[0032] Example 3 A high temperature resistant overhead cable comprises a cable core, an insulating layer and a protective layer from the inside to the outside, wherein the protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 25 parts of acrylonitrile-styrene-acrylate copolymer, 18 parts of epoxy resin, 30 parts of PBO fiber, 25 parts of serpentine, 40 parts of magnesium hydroxide, 3 parts of antioxidant 1076, 3 parts of diisodecyl phthalate, 2 parts of sodium stearate, 5 parts of HDPE-g-MAH; The insulating layer includes the following components in parts by weight: 65 parts of polyethylene, 25 parts of acrylonitrile-styrene-acrylate copolymer, 15 parts of EPDM rubber, 3 parts of antioxidant 1076, 3 parts of diisodecyl phthalate; The preparation method thereof comprises the following steps: S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S2, blending and extruding the components of the insulating layer in parts by weight to obtain an insulating layer mixture; During extrusion, the extrusion temperature of zone 1 is 170°C, the extrusion temperature of zone 2 is 190°C, and the extrusion temperature of zone 3 is 180°C; S3, coating the insulating layer mixture on the surface of the cable core to obtain a cable core with an outer insulating layer; S4. Coat the protective layer mixture on the surface of the cable core having an outer insulating layer to obtain an overhead cable.

[0033] Example 4 The only difference between this embodiment and embodiment 2 is that in this embodiment, the PBO fiber is a modified PBO fiber, the raw materials of the modified PBO fiber include PBO fiber and polyvinyl acetate, and the preparation method of the modified PBO fiber includes the following steps: dissolving 4 parts of polyvinyl acetate in acetone to obtain a polyvinyl acetate solution with a mass fraction of 4%, adding 20 parts of PBO fiber to the polyvinyl acetate solution with a mass fraction of 4%, dispersing evenly, and drying to obtain the modified PBO fiber.

[0034] Example 5 The only difference between this embodiment and embodiment 4 is that in this embodiment, 23.5 parts of PBO fiber and 0.5 parts of polyvinyl acetate are added.

[0035] Example 6 The only difference between this embodiment and embodiment 4 is that in this embodiment, 21 parts of PBO fiber and 3 parts of polyvinyl acetate are added.

[0036] Example 7 The only difference between this embodiment and embodiment 4 is that in this embodiment, 23 parts of PBO fiber and 1 part of polyvinyl acetate are added.

[0037] Example 8 The only difference between this embodiment and Embodiment 7 is that in this embodiment, the raw materials of the modified PBO fiber include PBO fiber and p-aminobenzamide, and the preparation method of the modified PBO fiber includes the following steps: dissolving 1 part of p-aminobenzamide in acetone to obtain a p-aminobenzamide solution with a mass fraction of 4%, adding 23 parts of PBO fiber to the p-aminobenzamide solution with a mass fraction of 4%, dispersing evenly, and drying to obtain the modified PBO fiber.

[0038] Example 9 The only difference between this embodiment and Embodiment 7 is that in this embodiment, the raw materials of the modified PBO fiber include PBO fiber, p-aminobenzamide and polyvinyl acetate, and the preparation method of the modified PBO fiber includes the following steps: dissolving 0.5 parts of polyvinyl acetate and 0.5 parts of p-aminobenzamide in acetone to obtain a mixed solution with a mass fraction of 6%, adding 23 parts of PBO fiber to the mixed solution with a mass fraction of 6%, dispersing evenly, and drying to obtain modified PBO fiber.

[0039] Example 10 The only difference between this embodiment and embodiment 9 is that in this embodiment, 20 parts of PBO fiber, 2 parts of p-aminobenzamide and 2 parts of polyvinyl acetate are added.

[0040] Embodiment 11 The only difference between this embodiment and embodiment 9 is that in this embodiment, 21 parts of PBO fiber, 1.5 parts of p-aminobenzamide and 1.5 parts of polyvinyl acetate are added.

[0041] Example 12 The only difference between this embodiment and embodiment 9 is that in this embodiment, 22 parts of PBO fiber, 1 part of p-aminobenzamide and 1 part of polyvinyl acetate are added.

[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, PBO fiber is not added.

[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that in this comparative example, serpentine is not added.

[0044] The protective layer mixtures of the overhead cables prepared in Examples 1 to 12 and Comparative Examples 1 to 2 were subjected to the following performance tests: ① The tensile strength of the protective layer mixture sample was tested according to the test method in GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General", where the test speed was 300 mm / min and the test result was the average value of 5 samples; ② Carry out heat aging test on the protective layer mixture sample according to the method in GB / T 7141-2008 "Test Method for Heat Aging of Plastics", and then carry out tensile strength test after heat aging test according to the above tensile strength test method, and calculate heat aging tensile strength retention rate according to the following formula: heat aging tensile strength retention rate = tensile strength after heat aging test / tensile strength before heat aging test × 100%, and keep one decimal place for the result; in the heat aging test, method B is adopted, the test temperature is 80℃, the test time is 128h, and the test result is the average value of 5 samples; The test results are shown in Table 1 below: Table 1 Performance test results of Examples 1 to 12 and Comparative Examples 1 to 2

[0045] Compared with Comparative Example 1, the tensile strength and heat aging tensile strength retention rate of Example 1 are significantly improved, indicating that when PBO fiber is added to the protective layer of the overhead cable, the tensile strength and high temperature resistance of the overhead cable protective layer can be improved by the coordinated use of PBO fiber and other components. Compared with Comparative Example 2, the tensile strength and heat aging tensile strength retention rate of Example 1 are significantly improved, indicating that when serpentine is added to the protective layer of the overhead cable, the tensile strength and high temperature resistance of the overhead cable protective layer can also be improved.

[0046] Compared with Example 2, the tensile strength and heat aging tensile strength retention rates of Examples 4 to 7 are improved, indicating that the use of polyvinyl acetate to modify the PBO fiber can further improve the tensile strength and high temperature resistance of the overhead cable protective layer. In addition, compared with Examples 4 to 5, the tensile strength and heat aging tensile strength retention rates of Examples 6 to 7 are improved, indicating that when the weight ratio of PBO fiber to polyvinyl acetate is 7 to 23:1, the tensile strength and high temperature resistance of the overhead cable protective layer can be further improved.

[0047] Compared with Examples 7 and 8, the tensile strength and heat aging tensile strength retention rate of Example 9 are improved, indicating that the tensile strength and high temperature resistance of the overhead cable protective layer can be further improved by using p-aminobenzamide and polyvinyl acetate to simultaneously modify the surface of PBO fiber. Compared with Examples 9 and 10, the tensile strength and heat aging tensile strength retention rate of Examples 11 and 12 are improved, indicating that when the weight ratio of PBO fiber, p-aminobenzamide and polyvinyl acetate is 14 to 22:1:1, the tensile strength and high temperature resistance of the overhead cable protective layer can be further improved.

[0048] 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 high temperature resistant overhead cable, characterized in that: The cable comprises a cable core, an insulating layer and a protective layer from the inside to the outside, wherein the protective layer comprises the following components in parts by weight: 65 parts of polyethylene, 15-25 parts of acrylonitrile-styrene-acrylate copolymer, 8-18 parts of epoxy resin, 20-30 parts of PBO fiber, 15-25 parts of serpentine, 30-40 parts of flame retardant, 1-3 parts of first antioxidant, 1-3 parts of first plasticizer, 1-2 parts of lubricant, and 1-5 parts of compatibilizer.

2. A high temperature resistant overhead cable according to claim 1, characterized in that: The PBO fiber is a modified PBO fiber, and the raw materials of the modified PBO fiber include PBO fiber and polyvinyl acetate.

3. A high temperature resistant overhead cable according to claim 2, characterized in that: The weight ratio of the PBO fiber to polyvinyl acetate is 7-23:

1.

4. A high temperature resistant overhead cable according to claim 2, characterized in that: The preparation method of the modified PBO fiber comprises the following steps: dissolving the polyvinyl acetate in acetone to obtain a polyvinyl acetate solution, adding the PBO fiber into the polyvinyl acetate solution, dispersing the PBO fiber uniformly, and drying the polyvinyl acetate solution to obtain the modified PBO fiber.

5. A high temperature resistant overhead cable according to claim 2, characterized in that: The raw material of the modified PBO fiber also includes p-aminobenzamide.

6. A high temperature resistant overhead cable according to claim 5, characterized in that: The weight ratio of the PBO fiber, p-aminobenzamide and polyvinyl acetate is 14-22:1:

1.

7. A high temperature resistant overhead cable according to claim 1, characterized in that: The insulating layer comprises the following components in parts by weight: 65 parts of polyethylene, 15-25 parts of acrylonitrile-styrene-acrylate copolymer, 10-15 parts of EPDM rubber, 1-3 parts of a second antioxidant, and 1-3 parts of a second plasticizer.

8. A high temperature resistant overhead cable according to claim 7, characterized in that: The first antioxidant and the second antioxidant are each independently one or more of the antioxidant 1010 , the antioxidant 300 , and the antioxidant 1076 .

9. A high temperature resistant overhead cable according to claim 7, characterized in that: The first plasticizer and the second plasticizer are each independently one or more of dicyclohexyl phthalate, diisodecyl phthalate, and dibutyl phthalate.

10. A high temperature resistant overhead cable according to claim 1, characterized in that: The lubricant is one or both of polyethylene wax and sodium stearate; the compatibilizer is one or both of HDPE-g-MAH and ABS-g-MAH; and the flame retardant is one or both of magnesium hydroxide and aluminum hydroxide.

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