A high-temperature resistant aerial cable

Abstract

The present invention relates to the technical field of cables, and provides a high-temperature resistant overhead cable. The overhead cable sequentially includes 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 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. Through the above technical solution, the problems of poor tensile strength and poor high-temperature resistance of the protective layer of the overhead cable in the related art are solved.

Description

Technical Field

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

[0002] An overhead cable is a wiring method that transmits electricity or signals by suspending the cable at a certain height above the ground through supports such as utility poles, and is an overhead conductor equipped with an insulating layer and a protective layer. Overhead cables are widely used in power transmission, especially suitable for long-distance and large-capacity power transmission. In areas with complex terrains, 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 a power network.

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

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

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a high-temperature resistant overhead cable, which sequentially includes a cable core, an insulating layer and a protective layer from inside to outside. The protective layer includes the following components in parts by weight:

[0007] 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 the first antioxidant, 1 - 3 parts of the first plasticizer, 1 - 2 parts of lubricant, 1 - 5 parts of compatibilizer.

[0008] 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.

[0009] The PBO fibers are modified with polyvinyl acetate, so that while the PBO fibers are evenly dispersed in the protective layer mixing system, the interaction between the PBO fibers and other components can be strengthened, thereby further improving the tensile strength and high-temperature resistance of the overhead cable protective layer.

[0010] As a further technical solution, the weight ratio of the PBO fibers to the polyvinyl acetate is 7 to 23:1.

[0011] When the weight ratio of the PBO fibers to the polyvinyl acetate is 7 to 23:1, the tensile strength and high-temperature resistance of the overhead cable protective layer can be further improved.

[0012] As a further technical solution, the preparation method of the modified PBO fibers includes the following steps: dissolving the polyvinyl acetate in acetone to obtain a polyvinyl acetate solution, adding the PBO fibers to the polyvinyl acetate solution, dispersing evenly, and drying to obtain the modified PBO fibers.

[0013] As a further technical solution, the mass fraction of the polyvinyl acetate solution is 4% to 10%.

[0014] As a further technical solution, the raw materials of the modified PBO fibers further include p-aminobenzamide.

[0015] The inventor found that during the modification of the PBO fibers, by adding p-aminobenzamide and simultaneously modifying the surface of the PBO fibers with p-aminobenzamide and polyvinyl acetate, the tensile strength and high-temperature resistance of the overhead cable protective layer can be further improved. It is speculated that the reason may be that the addition of p-aminobenzamide can further increase the binding of the PBO fibers to other components, thereby making the internal structure of the insulating layer more compact, and further improving the tensile strength and high-temperature resistance of the overhead cable protective layer.

[0016] As a further technical solution, the weight ratio of the PBO fibers, p-aminobenzamide and polyvinyl acetate is 14 to 22:1:1.

[0017] When the weight ratio of the PBO fibers, 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.

[0018] As a further technical solution, the preparation method of the modified PBO fibers includes the following steps: dissolving the polyvinyl acetate and the p-aminobenzamide in acetone to obtain a mixed solution, adding the PBO fibers to the mixed solution, dispersing evenly, and drying to obtain the modified PBO fibers.

[0019] As a further technical solution, the mass fraction of the mixed solution is 5% - 12%.

[0020] As a further technical solution, the insulating layer comprises the following components in parts by weight:

[0021] 65 parts of polyethylene, 15 - 25 parts of acrylonitrile - styrene - acrylate copolymer, 10 - 15 parts of ethylene - propylene - diene monomer rubber, 1 - 3 parts of the second antioxidant, and 1 - 3 parts of the second plasticizer.

[0022] As a further technical solution, the material of the cable core is aluminum alloy or copper alloy.

[0023] As a further technical solution, the first antioxidant and the second antioxidant are each independently one or more of antioxidant 1010, antioxidant 300, and antioxidant 1076.

[0024] As a further technical solution, the first plasticizer and the second plasticizer are each independently one or more of dicyclohexyl phthalate, diisodecyl phthalate, and dibutyl phthalate.

[0025] As a further technical solution, the lubricant is one or both of polyethylene wax and sodium stearate.

[0026] As a further technical solution, the compatibilizer is one or both of HDPE - g - MAH and ABS - g - MAH.

[0027] As a further technical solution, the flame retardant is one or both of magnesium hydroxide and aluminum hydroxide.

[0028] The present invention also provides a preparation method of the above - mentioned high - temperature resistant overhead cable, comprising the following steps:

[0029] S1. Blend the components of the protective layer in the above - mentioned parts by weight, and extrude to obtain a protective layer mixture;

[0030] S2. Blend the components of the insulating layer in the above - mentioned parts by weight, and extrude to obtain an insulating layer mixture;

[0031] S3. Coat the insulating layer mixture on the surface of the cable core to obtain a cable core with an insulating layer on the outer layer;

[0032] S4. Coat the protective layer mixture on the surface of the cable core with an insulating layer on the outer layer to obtain an overhead cable.

[0033] As a further technical solution, in step S1, during the extrusion, the temperature is 170 - 190 °C; in step S2, during the extrusion, the temperature is 170 - 190 °C.

[0034] The working principle and beneficial effects of the present invention are as follows:

[0035] In the present invention, PBO fibers are introduced into the protective layer of the aerial cable. Through the combined use of PBO fibers and other components, the protective layer of the aerial 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 aerial cable. Specific embodiments

[0036] The following will combine 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 a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0037] In the following examples and comparative examples, the polyethylene is high-density polyethylene with the model number M80064; the acrylonitrile-styrene-acrylate copolymer has the model number XC-500A; the epoxy resin has the model number CYD-012; the PBO fibers have a length of 3 mm, the product number is TD240814, and the manufacturer is Hubei Tengdi New Materials Co., Ltd.; the serpentine has a particle size of 400 mesh; the polyvinyl acetate has the model number XH-018; the compatibilizer is HDPE-g-MAH with the model number TY1352; the ethylene propylene diene monomer has the model number J-3092E; the cable core is made of aluminum alloy with the material AA8030.

[0038] Example 1

[0039] A high-temperature resistant aerial cable includes, from inside to outside, a cable core, an insulating layer, and a protective layer. The protective layer includes the following components in parts by weight:

[0040] 65 parts of polyethylene, 15 parts of acrylonitrile-styrene-acrylate copolymer, 8 parts of epoxy resin, 20 parts of PBO fibers, 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;

[0041] The insulating layer includes the following components in parts by weight:

[0042] 65 parts of polyethylene, 15 parts of acrylonitrile-styrene-acrylate copolymer, 10 parts of ethylene propylene diene monomer, 1 part of antioxidant 1076, 1 part of diisodecyl phthalate;

[0043] Its preparation method includes the following steps:

[0044] S1. Blend the components in parts by weight of the protective layer and extrude to obtain a protective layer mixture;

[0045] During extrusion, the extrusion temperature in Zone 1 is 170 °C, the extrusion temperature in Zone 2 is 190 °C, and the extrusion temperature in Zone 3 is 180 °C;

[0046] S2. Blend the components in parts by weight of the insulating layer and extrude to obtain an insulating layer mixture;

[0047] During extrusion, the extrusion temperature in Zone 1 is 170 °C, the extrusion temperature in Zone 2 is 190 °C, and the extrusion temperature in Zone 3 is 180 °C;

[0048] S3. Coat the insulating layer mixture on the surface of the cable core to obtain a cable core with an insulating layer on the outer layer;

[0049] S4. Coat the protective layer mixture on the surface of the cable core with an insulating layer on the outer layer to obtain an aerial cable.

[0050] Example 2

[0051] A high-temperature resistant aerial cable, which sequentially includes a cable core, an insulating layer and a protective layer from inside to outside. The protective layer includes the following components in parts by weight:

[0052] 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;

[0053] The insulating layer includes the following components in parts by weight:

[0054] 65 parts of polyethylene, 20 parts of acrylonitrile-styrene-acrylate copolymer, 13 parts of ethylene propylene diene monomer rubber, 2 parts of antioxidant 1076, 2 parts of diisodecyl phthalate;

[0055] Its preparation method includes the following steps:

[0056] S1. Blend the components in parts by weight of the protective layer and extrude to obtain a protective layer mixture;

[0057] During extrusion, the extrusion temperature in Zone 1 is 170 °C, the extrusion temperature in Zone 2 is 190 °C, and the extrusion temperature in Zone 3 is 180 °C;

[0058] S2. Blend the components in parts by weight of the insulating layer and extrude to obtain an insulating layer mixture;

[0059] During extrusion, the extrusion temperature in Zone 1 is 170 °C, the extrusion temperature in Zone 2 is 190 °C, and the extrusion temperature in Zone 3 is 180 °C;

[0060] S3. Coat the insulating layer mixture on the surface of the cable core to obtain a cable core with an insulating layer on the outer layer;

[0061] S4. Wrap the protective layer mixture around the surface of the cable core with an insulating layer on the outer layer to obtain an aerial cable.

[0062] Example 3

[0063] A high-temperature resistant aerial cable includes, from inside to outside in sequence, a cable core, an insulating layer, and a protective layer. The protective layer includes the following components in parts by weight:

[0064] 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;

[0065] The insulating layer includes the following components in parts by weight:

[0066] 65 parts of polyethylene, 25 parts of acrylonitrile-styrene-acrylate copolymer, 15 parts of ethylene-propylene-diene monomer rubber, 3 parts of antioxidant 1076, 3 parts of diisodecyl phthalate;

[0067] Its preparation method includes the following steps:

[0068] S1. Blend the components of the protective layer in parts by weight, and extrude to obtain a protective layer mixture;

[0069] When extruding, the extrusion temperature in zone 1 is 170 °C, the extrusion temperature in zone 2 is 190 °C, and the extrusion temperature in zone 3 is 180 °C;

[0070] S2. Blend the components of the insulating layer in parts by weight, and extrude to obtain an insulating layer mixture;

[0071] When extruding, the extrusion temperature in zone 1 is 170 °C, the extrusion temperature in zone 2 is 190 °C, and the extrusion temperature in zone 3 is 180 °C;

[0072] S3. Wrap the insulating layer mixture around the surface of the cable core to obtain a cable core with an insulating layer on the outer layer;

[0073] S4. Wrap the protective layer mixture around the surface of the cable core with an insulating layer on the outer layer to obtain an aerial cable.

[0074] Example 4

[0075] The difference between this embodiment and Embodiment 2 is only 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. The preparation method of the modified PBO fiber comprises the following steps: Dissolve 4 parts of polyvinyl acetate in acetone to obtain a polyvinyl acetate solution with a mass fraction of 4%. Add 20 parts of PBO fiber to the polyvinyl acetate solution with a mass fraction of 4%, disperse evenly, and dry to obtain the modified PBO fiber.

[0076] Example 5

[0077] The difference between this embodiment and Embodiment 4 is only that, in this embodiment, the added PBO fiber is 23.5 parts, and the added polyvinyl acetate is 0.5 part.

[0078] Example 6

[0079] The difference between this embodiment and Embodiment 4 is only that, in this embodiment, the added PBO fiber is 21 parts, and the added polyvinyl acetate is 3 parts.

[0080] Example 7

[0081] The difference between this embodiment and Embodiment 4 is only that, in this embodiment, the added PBO fiber is 23 parts, and the added polyvinyl acetate is 1 part.

[0082] Example 8

[0083] The difference between this embodiment and Embodiment 7 is only that, in this embodiment, the raw materials of the modified PBO fiber include PBO fiber and p-aminobenzamide. The preparation method of the modified PBO fiber comprises the following steps: Dissolve 1 part of p-aminobenzamide in acetone to obtain a p-aminobenzamide solution with a mass fraction of 4%. Add 23 parts of PBO fiber to the p-aminobenzamide solution with a mass fraction of 4%, disperse evenly, and dry to obtain the modified PBO fiber.

[0084] Example 9

[0085] The difference between this embodiment and Embodiment 7 is only that, in this embodiment, the raw materials of the modified PBO fiber include PBO fiber, p-aminobenzamide and polyvinyl acetate. The preparation method of the modified PBO fiber comprises the following steps: Dissolve 0.5 part of polyvinyl acetate and 0.5 part of p-aminobenzamide in acetone to obtain a mixed solution with a mass fraction of 6%. Add 23 parts of PBO fiber to the mixed solution with a mass fraction of 6%, disperse evenly, and dry to obtain the modified PBO fiber.

[0086] Example 10

[0087] The difference between this example and Example 9 is only that, in this example, 20 parts of PBO fiber, 2 parts of p-aminobenzamide, and 2 parts of polyvinyl acetate are added.

[0088] Example 11

[0089] The difference between this example and Example 9 is only that, in this example, 21 parts of PBO fiber, 1.5 parts of p-aminobenzamide, and 1.5 parts of polyvinyl acetate are added.

[0090] Example 12

[0091] The difference between this example and Example 9 is only that, in this example, 22 parts of PBO fiber, 1 part of p-aminobenzamide, and 1 part of polyvinyl acetate are added.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is only that, in this comparative example, PBO fiber is not added.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 1 is only that, in this comparative example, serpentine is not added.

[0096] The protective layer mixtures of the aerial cables prepared in Examples 1 to 12 and Comparative Examples 1 to 2 were subjected to the following performance tests:

[0097] ① The tensile strength of the protective layer mixture specimen was tested according to the test method in GB / T 1040.1-2018 Plastics - Determination of tensile properties - Part 1: General principles. Among them, the test speed was 300 mm / min, and the test result was the average value of 5 specimens;

[0098] ② The protective layer mixture specimen was subjected to a thermal aging test according to the method in GB / T 7141-2008 Plastics - Methods of thermal aging test. Then, the tensile strength test after the thermal aging test was carried out according to the above-mentioned tensile strength test method. The thermal aging tensile strength retention rate was calculated according to the following formula: Thermal aging tensile strength retention rate = Tensile strength after thermal aging test / Tensile strength before thermal aging test × 100%, and the result was reserved to 1 decimal place; Among them, when conducting the thermal aging test, Method B was adopted, the test temperature was 80 °C, and the time was 128 h. The test result was the average value of 5 specimens;

[0099] The test results are shown in Table 1 below:

[0100] Table 1 Performance test results of Examples 1 to 12 and Comparative Examples 1 to 2

[0101]

[0102] Compared with Comparative Example 1, the tensile strength and the retention rate of tensile strength after heat aging of Example 1 are significantly improved, indicating that when PBO fibers are added to the protective layer of the aerial cable, through the combined use of PBO fibers and other components, the tensile strength and high temperature resistance of the protective layer of the aerial cable can be improved. Compared with Comparative Example 2, the tensile strength and the retention rate of tensile strength after heat aging of Example 1 are significantly improved, indicating that when serpentine is added to the protective layer of the aerial cable, the tensile strength and high temperature resistance of the protective layer of the aerial cable can also be improved.

[0103] Compared with Example 2, the tensile strength and the retention rate of tensile strength after heat aging of Examples 4 to 7 are improved, indicating that the modification of PBO fibers with polyvinyl acetate can further improve the tensile strength and high temperature resistance of the protective layer of the aerial cable. In addition, compared with Examples 4 to 5, the tensile strength and the retention rate of tensile strength after heat aging of Examples 6 to 7 are improved, indicating that when the weight ratio of PBO fibers to polyvinyl acetate is 7 to 23:1, the tensile strength and high temperature resistance of the protective layer of the aerial cable can be further improved.

[0104] Compared with Examples 7 to 8, the tensile strength and the retention rate of tensile strength after heat aging of Example 9 are improved, indicating that the surface modification of PBO fibers with p-aminobenzamide and polyvinyl acetate simultaneously can further improve the tensile strength and high temperature resistance of the protective layer of the aerial cable. Compared with Examples 9 to 10, the tensile strength and the retention rate of tensile strength after heat aging of Examples 11 to 12 are improved, indicating that when the weight ratio of PBO fibers, p-aminobenzamide and polyvinyl acetate is 14 to 22:1:1, the tensile strength and high temperature resistance of the protective layer of the aerial cable can be further improved.

[0105] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall 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, 1-5 parts of compatibilizer; The PBO fiber is a modified PBO fiber, and the raw materials of the modified PBO fiber include PBO fiber and polyvinyl acetate; 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.

2. A high temperature resistant overhead cable according to claim 1, characterized in that: The weight ratio of the PBO fiber to polyvinyl acetate is 7-23:

1.

3. A high temperature resistant overhead cable according to claim 1, characterized in that: The raw material of the modified PBO fiber also includes p-aminobenzamide.

4. A high temperature resistant overhead cable according to claim 3, characterized in that: The weight ratio of the PBO fiber, p-aminobenzamide and polyvinyl acetate is 14-22:1:

1.

5. 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.

6. A high temperature resistant overhead cable according to claim 5, 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 .

7. A high temperature resistant overhead cable according to claim 5, characterized in that: The first plasticizer and the second plasticizer are each independently one or more of dicyclohexyl phthalate, diisodecyl phthalate, and dibutyl phthalate.

8. 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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