Anti-freezing power cable

Abstract

The 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, and the outer sheath is prepared from the following raw materials in parts by weight: 30-40 parts of butadiene styrene rubber, 25-35 parts of silicone rubber, 15-25 parts of filler, 20-25 parts of a flame retardant, 2-3 parts of a lubricant, 1-2 parts of a vulcanizing agent and 1-3 parts of a plasticizer; the filler is obtained by modifying illite powder through a modifier, and the modifier comprises an amino silane coupling agent and a phenyl-containing compound. According to the technical scheme, the problems of poor mechanical property and low temperature resistance of the power cable in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to an antifreeze power cable. Background Art

[0002] In recent years, with the continuous growth of electricity demand and the improvement of power supply reliability requirements, power cable technology has developed rapidly. Power cables are an indispensable part of the power system, used to transmit the electricity generated by power plants to substations and distribution stations, and then distributed to various places. With the continuous advancement of energy development, more and more energy projects are built in cold areas. For example, wind farms, oil and gas extraction facilities, etc. are often located in cold areas. These energy facilities require a reliable power supply, but in cold areas, especially in extremely low temperatures in winter, traditional power cables face many problems. Low temperatures can make the insulation material of the cable hard and brittle, and cracking may occur, leading to safety hazards such as 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 invention provides an antifreeze power cable, which solves the problem of poor mechanical properties and low temperature resistance of the power cable in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides an antifreeze power cable, which comprises, from inside to outside, a conductor, an insulating layer, an inner lining layer, an armor layer, and an outer sheath, wherein the outer sheath comprises the following raw materials in parts by weight: 30 to 40 parts of styrene-butadiene rubber, 25 to 35 parts of silicone rubber, 15 to 25 parts of fillers, 20 to 25 parts of flame retardants, 2 to 3 parts of lubricants, 1 to 2 parts of vulcanizers, and 1 to 3 parts of plasticizers; the filler is illite powder modified by a modifier, and the modifier comprises an aminosilane coupling agent and a phenyl-containing compound.

[0005] As a further technical solution, the conductor is copper wire, and the raw material of the insulating layer is polyethylene; the lining layer is polyvinyl chloride tape, and the armor layer is steel tape.

[0006] As a further technical solution, the number of phenyl groups in the phenyl-containing compound is ≤2.

[0007] In the present invention, by limiting the number of phenyl groups in the phenyl-containing compound to ≤2, the low temperature resistance and mechanical properties of the antifreeze power cable are further improved.

[0008] As a further technical solution, the phenyl-containing compound includes one or two of 5-phenylvaleric acid and 1,6-bis(p-carboxyphenoxy)hexane.

[0009] As a further technical solution, the aminosilane coupling agent includes one or both of γ-aminopropylmethyldiethoxysilane and γ-aminopropyltriethoxysilane, preferably γ-aminopropyltriethoxysilane.

[0010] As a further technical solution, the phenyl-containing compound is 1,6-bis(p-carboxyphenoxy)hexane.

[0011] As a further technical solution, the amount of the modifier added is 2% to 4% of the mass of the illite powder.

[0012] As a further technical solution, the mass ratio of the phenyl-containing compound to the aminosilane coupling agent is 1:3~6.

[0013] In the present invention, by limiting the mass ratio of the phenyl-containing compound to the aminosilane coupling agent to 1:3-6, the low temperature resistance and mechanical properties of the antifreeze power cable are further improved.

[0014] As a further technical solution, the mass ratio of the phenyl-containing compound to the aminosilane coupling agent is 1:5.

[0015] 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.

[0016] As a further technical solution, the volume ratio of ethanol to water in the ethanol aqueous solution is 4:1.

[0017] As a further technical solution, the modification temperature is 50-60° C., and the modification time is 6-8 hours.

[0018] 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%, or 35% or more, preferably 5% to 10%.

[0019] As a further technical solution, the styrene-butadiene rubber is composed 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%.

[0020] In the present invention, the mechanical properties of the power cable are further improved by limiting the styrene mass content of the first styrene butadiene rubber to 23.5% and the styrene mass content of the second styrene butadiene rubber to 68%.

[0021] As a further technical solution, the mass ratio of the first styrene butadiene rubber to the second styrene butadiene rubber is 5-9:1.

[0022] In the present invention, the mechanical properties of the power cable are further improved by limiting the mass ratio of the first styrene butadiene rubber to the second styrene butadiene rubber to 5-9:1.

[0023] As a further technical solution, the flame retardant includes one or more of ammonium polyphosphate, triphenol phosphate, and antimony trioxide.

[0024] As a further technical solution, the lubricant includes one or both of erucamide and polyethylene wax.

[0025] As a further technical solution, the vulcanizing agent includes one or more of N,N'-m-phenylene bismaleimide, 1,1-dithiodicaprolactam, and sulfur.

[0026] As a further technical solution, the plasticizer includes one or more of epoxidized soybean oil, dioctyl terephthalate, and butoxytriglycol adipate.

[0027] The present invention also provides a method for preparing an antifreeze power cable, comprising the following steps: S1. Extruding an insulating material on the outside of the copper wire to form an insulating layer, wrapping an inner lining layer on the outside of the insulating layer, and wrapping an armor layer on the outside of the inner lining layer to obtain a semi-finished power cable; S2. The raw materials of the outer sheath are mixed and then extruded onto the outside of the semi-finished power cable to obtain an antifreeze power cable.

[0028] The working principle and beneficial effects of the present invention are: In the present invention, by adding styrene-butadiene rubber and silicone rubber into the outer sheath, the low-temperature resistance of the power cable is improved, and by adding illite powder modified by an aminosilane coupling agent and a phenyl-containing compound, the low-temperature resistance and mechanical properties of the outer sheath are further improved, thereby solving the problem that the power cable is prone to becoming brittle and cracking at low temperatures. DETAILED DESCRIPTION

[0029] 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.

[0030] In the following embodiments and comparative examples: Styrene-butadiene rubber model SBR1502, styrene base mass content: 23.5%; Styrene-butadiene rubber model SBR-HS860, styrene base mass content: 68%; Phenyl silicone rubber, model: SE6660, phenyl content is 5%~10%; Illite powder, particle size: 600 mesh.

[0031] Example 1 A method for preparing an antifreeze power cable comprises the following steps: S1. Extruding a polyethylene material on the outside of a copper wire to form an insulating layer, wrapping a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wrapping a steel tape on the outside of the inner lining layer to form an armor layer to obtain a semi-finished power cable; S2. Evenly 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 erucamide and 1 part of epoxy soybean oil, and then add 1 part of N,N'-m-phenylene bismaleimide for vulcanization, and then extrude it on the outside of the semi-finished power cable to obtain an antifreeze power cable.

[0032] The preparation method of the filler comprises the following steps: dissolving 0.42 g of γ-aminopropyltriethoxysilane and 0.42 g of tetrakis(4-carboxyphenyl)methane in an ethanol aqueous solution (the volume ratio of ethanol to water is 4:1), adding 42 g of illite powder and dispersing them evenly, heating to 50° C., stirring at the temperature for 8 hours, and drying to obtain the filler.

[0033] Example 2 A method for preparing an antifreeze power cable comprises the following steps: S1. Extruding a polyethylene material on the outside of a copper wire to form an insulating layer, wrapping a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wrapping a steel tape on the outside of the inner lining layer to form an armor layer to obtain a semi-finished power cable; S2. Evenly mix 35 parts of SBR-HS860 styrene-butadiene rubber, 30 parts of phenyl silicone rubber, 20 parts of filler, 22 parts of triphenol phosphate, 2 parts of polyethylene wax and 2 parts of dioctyl terephthalate, and then add 1 part of 1,1-dithiodicaprolactam for vulcanization, and then extrude and wrap it on the outside of the semi-finished power cable to obtain an antifreeze power cable.

[0034] The preparation method of the filler comprises the following steps: dissolving 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), adding 42 g of illite powder and dispersing them evenly, heating to 55° C., stirring at the temperature for 7 hours, and drying to obtain the filler.

[0035] Example 3 A method for preparing an antifreeze power cable comprises the following steps: S1. Extruding a polyethylene material on the outside of a copper wire to form an insulating layer, wrapping a polyvinyl chloride tape on the outside of the insulating layer to form an inner lining layer, and wrapping a steel tape on the outside of the inner lining layer to form an armor layer to obtain a semi-finished power cable; S2. Evenly 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, and then add 2 parts of sulfur for vulcanization. Then, extrude and wrap the mixture on the outside of the semi-finished power cable to obtain an antifreeze power cable.

[0036] The preparation method of the filler comprises the following steps: dissolving 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), adding 42 g of illite powder and dispersing them evenly, heating to 60° C., stirring at the temperature for 6 hours, and drying to obtain the filler.

[0037] Example 4 The only difference between this embodiment and embodiment 1 is that tetrakis(4-carboxyphenyl)methane is replaced by an equal amount of 5-phenylpentanoic acid.

[0038] Example 5 The only difference between this embodiment and embodiment 1 is that tetrakis(4-carboxyphenyl)methane is replaced by an equal amount of 1,6-bis(p-carboxyphenoxy)hexane.

[0039] Example 6 The only difference between this embodiment and embodiment 5 is that the added amount of γ-aminopropyltriethoxysilane is 0.76 g, and the added amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.08 g.

[0040] Example 7 The only difference between this embodiment and embodiment 5 is that the added amount of γ-aminopropyltriethoxysilane is 0.63 g, and the added amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.21 g.

[0041] Example 8 The only difference between this embodiment and embodiment 5 is that the added amount of γ-aminopropyltriethoxysilane is 0.7 g, and the added amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.14 g.

[0042] Example 9 The only difference between this embodiment and embodiment 5 is that the added amount of γ-aminopropyltriethoxysilane is 0.72 g, and the added amount of 1,6-bis(p-carboxyphenoxy)hexane is 0.12 g.

[0043] Example 10 The only difference between this embodiment and embodiment 8 is that the SBR-HS860 styrene butadiene rubber is replaced by an equal amount of SBR1502 styrene butadiene rubber.

[0044] Embodiment 11 The only difference between this embodiment and embodiment 8 is that the SBR-HS860 styrene butadiene rubber is replaced by equal amounts of SBR1502 styrene butadiene rubber and SBR-HS860 styrene butadiene rubber in a mass ratio of 3:1.

[0045] Example 12 The only difference between this embodiment and Embodiment 11 is that the mass ratio of SBR1502 styrene butadiene rubber to SBR-HS860 styrene butadiene rubber is 10:1.

[0046] Example 13 The only difference between this embodiment and Embodiment 11 is that the mass ratio of SBR1502 styrene butadiene rubber to SBR-HS860 styrene butadiene rubber is 5:1.

[0047] Embodiment 14 The only difference between this embodiment and Embodiment 11 is that the mass ratio of SBR1502 styrene butadiene rubber to SBR-HS860 styrene butadiene rubber is 9:1.

[0048] Comparative Example 1 The only difference between this comparative example and Example 1 is that the filler is illite powder.

[0049] Comparative Example 2 The only difference between this comparative example and Example 1 is that tetrakis(4-carboxyphenyl)methane is replaced by an equal amount of γ-aminopropyltriethoxysilane.

[0050] Comparative Example 3 The only difference between this comparative example and Example 1 is that tetrakis(4-carboxyphenyl)methane is replaced by an equal amount of adipic acid.

[0051] The power cable outer sheath materials prepared in Examples 1 to 14 and Comparative Examples 1 to 3 were respectively tested for tensile strength of the power cable outer sheath at room temperature and tensile strength retention of the power cable outer sheath after being placed at -50°C for 100 hours according to the test method in GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; Tensile strength retention rate = tensile strength after low temperature treatment / tensile strength before low temperature treatment × 100 (%); The test results are shown in Table 1.

[0052] Table 1 Power cable performance test results

[0053] Compared with Example 1, unmodified illite powder is added in Comparative Example 1, only γ-aminopropyltriethoxysilane is used to modify the illite powder in Comparative Example 2, and γ-aminopropyltriethoxysilane and adipic acid are used to modify the illite powder in Comparative Example 3. As a result, the tensile strength of the power cables prepared in Comparative Examples 1 to 3 and the tensile strength retention rate after low-temperature treatment are lower than those in Example 1, indicating that when the illite powder is modified by aminosilane coupling agent and phenyl-containing compounds, the mechanical properties and low-temperature resistance of the power cable can be improved.

[0054] Compared with Example 1, Examples 4 to 5 change the number of phenyl groups in the phenyl-containing compound. As a result, the tensile strength of the power cable prepared in Example 5 and the tensile strength retention rate after low-temperature treatment are 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.

[0055] Compared with Example 5, the mass ratio of γ-aminopropyltriethoxysilane and 1,6-bis(p-carboxyphenoxy)hexane was changed in Examples 6 to 9. As a result, the tensile strength of the power cables prepared in Examples 7 to 9 and the retention rate of tensile strength after low-temperature treatment were higher than those in Example 5 and Example 6, indicating that when the mass ratio of the aminosilane coupling agent to 1,6-bis(p-carboxyphenoxy)hexane was 3 to 6:1, the mechanical properties and low-temperature resistance of the power cable could 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 tensile strength after low-temperature treatment were higher than those in Example 7 and Example 9, indicating that when the mass ratio of the aminosilane coupling agent to 1,6-bis(p-carboxyphenoxy)hexane was 5:1, the mechanical properties and low-temperature resistance of the prepared power cable were the best.

[0056] Compared with Example 8, Examples 10 to 14 change the composition of the styrene-butadiene rubber. As a result, the tensile strength of the power cables prepared in Examples 11 to 14 is higher than that in Examples 8 and 10, indicating that when the styrene-butadiene rubber consists of styrene-butadiene rubber with a styrene-based mass content of 68% and styrene-butadiene rubber with a styrene-based mass content of 23.5%, the mechanical properties of the power cable can be further improved; by comparing Examples 11 to 14, it is found that the tensile strength of the power cables in Examples 13 to 14 is higher than that in Examples 11 to 12, indicating that when the mass ratio of styrene-butadiene rubber with a styrene-based mass content of 23.5% to styrene-butadiene rubber with a styrene-based mass content of 68% is 5 to 9:1, the mechanical properties of the power cable can be further improved.

[0057] 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 freeze-proof power cable, characterized in that: From inside to outside, there are conductor, insulation layer, inner lining layer, armor layer and outer sheath. The outer sheath includes 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 includes an aminosilane coupling agent and a phenyl-containing compound.

2. The antifreeze power cable according to claim 1, characterized in that: The number of phenyl groups in the phenyl-containing compound is ≤2.

3. The antifreeze power cable according to claim 2, characterized in that: The phenyl-containing compound includes one or both of 5-phenylvaleric acid and 1,6-bis(p-carboxyphenoxy)hexane.

4. 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.

5. 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.

6. 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.

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

8. The antifreeze power cable according to claim 7, characterized in that: The mole fraction of phenyl chain segments in the phenyl silicone rubber is 5% to 10%.

9. 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%.

10. The antifreeze power cable according to claim 9, 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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