An anti-freeze power cable

Abstract

The present invention relates to the technical field of power cables, and provides an anti-freezing power cable, which sequentially comprises a conductor, an insulating layer, a lining layer, an armor layer, and an outer sheath from inside to outside. The outer sheath comprises raw materials with the following parts by weight: 30-40 parts of styrene-butadiene rubber, 25-35 parts of silicone rubber, 15-25 parts of filler, 20-25 parts of flame retardant, 2-3 parts of lubricant, 1-2 parts of vulcanizing agent, and 1-3 parts of plasticizer; the filler is obtained by modifying illite powder with a modifier, and the modifier comprises an amino-silane coupling agent and a phenyl-containing compound. Through the above technical solution, the problems of poor mechanical properties and low temperature resistance of power cables in the related art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and more specifically, to an anti-freezing power cable. Background Art

[0002] In recent years, with the continuous growth of power demand and the improvement of the requirements for power supply reliability, the power cable technology has developed rapidly. Power cables are an essential part of the power system and are used to transmit the electric energy generated by power plants to substations and distribution stations and then distribute it to various places. With the continuous advancement of energy development, more and more energy projects are being built in cold regions. For example, wind farms, oil and gas extraction facilities, etc. are often located in cold regions. These energy facilities require reliable power supply. However, in cold regions, especially in an environment with extremely low winter temperatures, traditional power cables face many problems. Low temperature will make the insulating material of the cable hard and brittle, and cracking may occur, leading to potential safety hazards such as electric leakage and short circuit. Therefore, it is necessary to develop a low-temperature resistant power cable to ensure the safe transmission of electricity. Summary of the Invention

[0003] The present invention provides an anti-freezing power cable, which solves the problems of poor mechanical properties and low-temperature resistance of power cables in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides an anti-freezing power cable, which from inside to outside in sequence comprises a conductor, an insulating layer, a lining layer, an armor layer, and an outer sheath. The outer sheath comprises raw materials in the following parts by weight: 30-40 parts of styrene-butadiene rubber, 25-35 parts of silicone rubber, 15-25 parts of filler, 20-25 parts of flame retardant, 2-3 parts of lubricant, 1-2 parts of vulcanizing agent, and 1-3 parts of plasticizer; the filler is obtained by modifying illite powder with a modifier, and the modifier comprises an amino-silane coupling agent and a phenyl-containing compound.

[0006] As a further technical solution, the conductor is copper wire, and the raw material of the insulating layer is polyethylene; the lining layer is a polyvinyl chloride tape, and the armor layer is a steel strip.

[0007] As a further technical solution, the number of phenyl groups in the phenyl-containing compound ≤ 2.

[0008] In the present invention, by limiting the number of phenyl groups in the phenyl-containing compound ≤ 2, the low-temperature resistance and mechanical properties of the anti-freezing power cable are further improved.

[0009] As a further technical solution, the phenyl-containing compound comprises one or two of 5-phenylvaleric acid and 1,6-bis(p-carboxyphenoxy)hexane.

[0010] As a further technical solution, the amino-silane coupling agent includes one or two of γ-aminopropylmethyldiethoxysilane and γ-aminopropyltriethoxysilane, preferably γ-aminopropyltriethoxysilane.

[0011] As a further technical solution, the phenyl-containing compound is 1,6-bis(p-carboxyphenoxy)hexane.

[0012] As a further technical solution, the addition amount of the modifier is 2% to 4% of the mass of illite powder.

[0013] As a further technical solution, the mass ratio of the phenyl-containing compound to the amino-silane coupling agent is 1:3 to 6.

[0014] In the present invention, by defining the mass ratio of the phenyl-containing compound to the amino-silane coupling agent as 1:3 to 6, the low-temperature resistance and mechanical properties of the anti-freezing power cable are further improved.

[0015] As a further technical solution, the mass ratio of the phenyl-containing compound to the amino-silane coupling agent is 1:5.

[0016] As a further technical solution, the preparation method of the filler includes the following steps: dissolving the modifier in an ethanol aqueous solution, adding illite powder for modification, and obtaining the filler after drying.

[0017] As a further technical solution, the volume ratio of ethanol to water in the ethanol aqueous solution is 4:1.

[0018] As a further technical solution, the modification temperature is 50 to 60 °C, and the modification time is 6 to 8 h.

[0019] As a further technical solution, the silicone rubber is phenyl silicone rubber, and the molar fraction of phenyl chain segments in the phenyl silicone rubber can be 5% to 10%, 10% to 25%, more than 35%, preferably 5% to 10%.

[0020] As a further technical solution, the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber. The mass content of styryl groups in the first styrene-butadiene rubber is 23.5%, and the mass content of styryl groups in the second styrene-butadiene rubber is 68%.

[0021] In the present invention, by defining the mass content of styryl groups in the first styrene-butadiene rubber as 23.5% and the mass content of styryl groups in the second styrene-butadiene rubber as 68%, the mechanical properties of the power cable are further improved.

[0022] As a further technical solution, the mass ratio of the first styrene-butadiene rubber to the second styrene-butadiene rubber is 5 to 9:1.

[0023] In the present invention, by defining the mass ratio of the first styrene-butadiene rubber to the second styrene-butadiene rubber as 5-9:1, the mechanical properties of the power cable are further improved.

[0024] As a further technical solution, the flame retardant includes one or more of ammonium polyphosphate, triphenyl phosphate, and antimony trioxide.

[0025] As a further technical solution, the lubricant includes one or two of erucamide and polyethylene wax.

[0026] As a further technical solution, the vulcanizing agent includes one or more of N,N'-m-phenylene bismaleimide, 1,1-dithiodihexanolactam, and sulfur.

[0027] As a further technical solution, the plasticizer includes one or more of epoxy soybean oil, dioctyl terephthalate, and butoxytriglycol adipate.

[0028] The present invention also provides a method for preparing an antifreeze power cable, comprising the following steps:

[0029] S1. Extrude the insulating material on the outside of the copper wire to form an insulating layer, wrap an inner lining layer on the outside of the insulating layer, and wrap an armor layer on the outside of the inner lining layer to obtain a semi-finished power cable;

[0030] S2. Mix the raw materials of the outer sheath and extrude them on the outside of the semi-finished power cable to obtain an antifreeze power cable.

[0031] The working principle and beneficial effects of the present invention are as follows:

[0032] In the present invention, by adding styrene-butadiene rubber and silicone rubber to the outer sheath, the low-temperature resistance of the power cable is improved. Adding illite powder modified by an amino silane coupling agent and a phenyl-containing compound further improves the low-temperature resistance and mechanical properties of the outer sheath, and solves the problem that the power cable is prone to becoming brittle and cracking at low temperatures. Specific Embodiments

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0034] In the following examples and comparative examples:

[0035] Styrene-butadiene rubber of model SBR1502, mass content of styryl group: 23.5%;

[0036] Styrene-butadiene rubber with model number SBR-HS860, mass content of styryl group: 68%;

[0037] Phenyl silicone rubber, model: SE6660, phenyl content: 5% - 10%;

[0038] Illite powder, particle size: 600 mesh.

[0039] Example 1

[0040] A preparation method of an anti-freezing power cable, comprising the following steps:

[0041] S1. Extrude polyethylene material on the outside of the copper wire to form an insulating layer, wrap a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wrap a steel tape on the outside of the inner lining layer to form an armored layer, obtaining a semi-finished power cable;

[0042] S2. Mix 30 parts of SBR-HS860 styrene-butadiene rubber, 25 parts of phenyl silicone rubber, 15 parts of filler, 20 parts of ammonium polyphosphate, 2 parts of erucic acid amide, and 1 part of epoxidized soybean oil evenly, then carry out mixing and kneading, then add 1 part of N,N'-m-phenylene bismaleimide for vulcanization, and then extrude and wrap it on the outside of the semi-finished power cable to obtain an anti-freezing power cable.

[0043] A preparation method of the filler, comprising the following steps: Dissolve 0.42 g of γ-aminopropyltriethoxysilane and 0.42 g of tetrakis(4-carboxyphenyl)methane in an ethanol aqueous solution (volume ratio of ethanol to water is 4:1), add 42 g of illite powder and disperse evenly, heat to 50 °C, then keep stirring for 8 h, and obtain the filler through drying.

[0044] Example 2

[0045] A preparation method of an anti-freezing power cable, comprising the following steps:

[0046] S1. Extrude polyethylene material on the outside of the copper wire to form an insulating layer, wrap a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wrap a steel tape on the outside of the inner lining layer to form an armored layer, obtaining a semi-finished power cable;

[0047] S2. Mix 35 parts of SBR-HS860 styrene-butadiene rubber, 30 parts of phenyl silicone rubber, 20 parts of filler, 22 parts of triphenyl phosphate, 2 parts of polyethylene wax, and 2 parts of dioctyl terephthalate evenly, then carry out mixing and kneading, then add 1 part of 1,1-dithiobis(hexanamide) for vulcanization, and then extrude and wrap it on the outside of the semi-finished power cable to obtain an anti-freezing power cable.

[0048] The preparation method of the filler includes the following steps: Dissolve 0.63 g of γ-aminopropyltriethoxysilane and 0.63 g of tetrakis(4-carboxyphenyl)methane in an ethanol aqueous solution (the volume ratio of ethanol to water is 4:1), add 42 g of illite powder and disperse evenly. After heating to 55 °C, keep stirring for 7 h and obtain the filler through drying.

[0049] Example 3

[0050] The preparation method of an anti-freezing power cable includes the following steps:

[0051] S1. Extrude polyethylene material on the outside of the copper wire to form an insulating layer, wind a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wind a steel tape on the outside of the inner lining layer to form an armored layer, obtaining a semi-finished power cable;

[0052] S2. Mix 40 parts of SBR-HS860 styrene-butadiene rubber, 35 parts of phenyl silicone rubber, 25 parts of filler, 25 parts of antimony trioxide, 3 parts of polyethylene wax, and 3 parts of butoxytriglycol adipate evenly, then carry out mixing and kneading, then add 2 parts of sulfur for vulcanization, and then extrude and wrap it on the outside of the semi-finished power cable to obtain the anti-freezing power cable.

[0053] The preparation method of the filler includes the following steps: Dissolve 0.84 g of γ-aminopropyltriethoxysilane and 0.84 g of tetrakis(4-carboxyphenyl)methane in an ethanol aqueous solution (the volume ratio of ethanol to water is 4:1), add 42 g of illite powder and disperse evenly. After heating to 60 °C, keep stirring for 6 h and obtain the filler through drying.

[0054] Example 4

[0055] Compared with Example 1, the difference in this example is only that tetrakis(4-carboxyphenyl)methane is replaced with an equal amount of 5-phenylvaleric acid.

[0056] Example 5

[0057] Compared with Example 1, the difference in this example is only that tetrakis(4-carboxyphenyl)methane is replaced with an equal amount of 1,6-bis(p-carboxyphenoxy)hexane.

[0058] Example 6

[0059] Compared with Example 5, the difference in this example is only that the addition amount of γ-aminopropyltriethoxysilane is 0.76 g and the addition amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.08 g.

[0060] Example 7

[0061] This example is only different from Example 5 in that the addition amount of γ-aminopropyltriethoxysilane is 0.63 g and the addition amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.21 g.

[0062] Example 8

[0063] This example is only different from Example 5 in that the addition amount of γ-aminopropyltriethoxysilane is 0.7 g and the addition amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.14 g.

[0064] Example 9

[0065] This example is only different from Example 5 in that the addition amount of γ-aminopropyltriethoxysilane is 0.72 g and the addition amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.12 g.

[0066] Example 10

[0067] This example is only different from Example 8 in that the SBR-HS860 styrene-butadiene rubber is replaced with an equal amount of SBR1502 styrene-butadiene rubber.

[0068] Example 11

[0069] This example is only different from Example 8 in that the SBR-HS860 styrene-butadiene rubber is replaced with an equal amount of a mixture of SBR1502 styrene-butadiene rubber and SBR-HS860 styrene-butadiene rubber with a mass ratio of 3:1.

[0070] Example 12

[0071] This example is only different from Example 11 in that the mass ratio of SBR1502 styrene-butadiene rubber to SBR-HS860 styrene-butadiene rubber is 10:1.

[0072] Example 13

[0073] This example is only different from Example 11 in that the mass ratio of SBR1502 styrene-butadiene rubber to SBR-HS860 styrene-butadiene rubber is 5:1.

[0074] Example 14

[0075] This example is only different from Example 11 in that the mass ratio of SBR1502 styrene-butadiene rubber to SBR-HS860 styrene-butadiene rubber is 9:1.

[0076] Comparative Example 1

[0077] This comparative example is only different from Example 1 in that the filler is illite powder.

[0078] Comparative Example 2

[0079] This comparative example is different from Example 1 only in that tetrakis(4-carboxyphenyl)methane is replaced with an equal amount of γ-aminopropyltriethoxysilane.

[0080] Comparative Example 3

[0081] This comparative example is different from Example 1 only in that tetrakis(4-carboxyphenyl)methane is replaced with an equal amount of adipic acid.

[0082] The power cable outer sheath materials prepared in Examples 1 to 14 and Comparative Examples 1 to 3 were respectively tested for the tensile strength of the power cable outer sheath at room temperature and the tensile strength retention rate of the power cable outer sheath after being placed at -50°C for 100 h according to the test method in GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0083] Tensile strength retention rate = tensile strength after low-temperature treatment / tensile strength before low-temperature treatment × 100 (%).

[0084] The test results are shown in Table 1.

[0085] Table 1 Test results of power cable performance

[0086]

[0087] Compared with Example 1, unmodified illite powder was added in Comparative Example 1, only γ-aminopropyltriethoxysilane was used to modify illite powder in Comparative Example 2, and γ-aminopropyltriethoxysilane and adipic acid were used to modify illite powder in Comparative Example 3. As a result, the tensile strength of the power cable and the tensile strength retention rate after low-temperature treatment prepared in Comparative Examples 1 to 3 were lower than those in Example 1, indicating that when using an amino silane coupling agent and a phenyl-containing compound to modify illite powder, the mechanical properties and low-temperature resistance of the power cable can be improved.

[0088] Compared with Example 1, the number of phenyl groups in the phenyl-containing compound was changed in Examples 4 to 5. As a result, the tensile strength of the power cable and the tensile strength retention rate after low-temperature treatment prepared in Example 5 were higher than those in Example 1 and Example 4, indicating that when the number of phenyl groups in the phenyl-containing compound is 2, the mechanical properties and low-temperature resistance of the power cable can be further improved.

[0089] Compared with Example 5, in Examples 6 to 9, the mass ratio of γ-aminopropyltriethoxysilane and 1,6-bis(p-carboxyphenoxy)hexane was changed. As a result, the tensile strength of the power cables prepared in Examples 7 to 9 and the retention rate of the tensile strength after low-temperature treatment were higher than those in Example 5 and Example 6, indicating that when the mass ratio of the amino silane coupling agent to 1,6-bis(p-carboxyphenoxy)hexane is 3 to 6:1, the mechanical properties and low-temperature resistance of the power cable can be further improved. By comparing Examples 7 to 9, it was found that the tensile strength of the power cable prepared in Example 8 and the retention rate of the tensile strength after low-temperature treatment were higher than those in Example 7 and Example 9, indicating that when the mass ratio of the amino silane coupling agent to 1,6-bis(p-carboxyphenoxy)hexane is 5:1, the mechanical properties and low-temperature resistance of the prepared power cable are the best.

[0090] Compared with Example 8, in Examples 10 to 14, the composition of the styrene-butadiene rubber was changed. As a result, the tensile strength of the power cables prepared in Examples 11 to 14 was higher than that in Example 8 and Example 10, indicating that when the styrene-butadiene rubber is composed of styrene-butadiene rubber with a styrene group mass content of 68% and styrene-butadiene rubber with a styrene group mass content of 23.5%, the mechanical properties of the power cable can be further improved. By comparing Examples 11 to 14, it was found that the tensile strength of the power cables in Examples 13 to 14 was higher than that in Examples 11 to 12, indicating that when the mass ratio of the styrene-butadiene rubber with a styrene group mass content of 23.5% to the styrene-butadiene rubber with a styrene group mass content of 68% is 5 to 9:1, the mechanical properties of the power cable can be further improved.

[0091] 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 freeze-proof power cable, characterized in that: From inside to outside, the conductor, the insulating layer, the inner lining layer, the armor layer, and the outer sheath are arranged in order. The outer sheath comprises the following raw materials in parts by weight: 30-40 parts of styrene-butadiene rubber, 25-35 parts of silicone rubber, 15-25 parts of filler, 20-25 parts of flame retardant, 2-3 parts of lubricant, 1-2 parts of vulcanizer, and 1-3 parts of plasticizer; the filler is illite powder modified by a modifier, and the modifier comprises an aminosilane coupling agent and a phenyl-containing compound; The phenyl-containing compound includes one or both of 5-phenylvaleric acid and 1,6-bis(p-carboxyphenoxy)hexane.

2. The antifreeze power cable according to claim 1, characterized in that: The amount of the modifier added is 2% to 4% of the mass of the illite powder.

3. The antifreeze power cable according to claim 1, characterized in that: The mass ratio of the phenyl-containing compound to the aminosilane coupling agent is 1:3-6.

4. The antifreeze power cable according to claim 1, characterized in that: The preparation method of the filler comprises the following steps: dissolving a modifier in an ethanol aqueous solution, adding illite powder for modification, and obtaining the filler after drying.

5. The antifreeze power cable according to claim 1, characterized in that: The silicone rubber is phenyl silicone rubber.

6. The antifreeze power cable according to claim 5, characterized in that: The mole fraction of phenyl chain segments in the phenyl silicone rubber is 5% to 10%.

7. The antifreeze power cable according to claim 1, characterized in that: The styrene-butadiene rubber consists of a first styrene-butadiene rubber and a second styrene-butadiene rubber. The first styrene-butadiene rubber has a styrene-based mass content of 23.5%, and the second styrene-butadiene rubber has a styrene-based mass content of 68%.

8. The antifreeze power cable according to claim 7, characterized in that: The mass ratio of the first styrene butadiene rubber to the second styrene butadiene rubber is 5-9:1.

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