Corrosion-resistant aerial insulated cable and method of manufacturing the same

Abstract

The application relates to the technical field of cables, and discloses a corrosion-resistant overhead insulated cable and a manufacturing method thereof. The corrosion-resistant overhead insulated cable comprises, from inside to outside, a conductor, a shielding layer and an insulation layer. The insulation layer comprises the following components by weight: 65-75 parts of high-density polyethylene, 5-7 parts of modified kaolin, 13-17 parts of ethylene-tetrafluoroethylene copolymer, 0.5-2 parts of an antioxidant, 1-3 parts of a plasticizer, 8-10 parts of a flame retardant and 0.5-1.5 parts of a lubricant. The modified kaolin is first modified by ethenyl triethoxysilane to obtain silanized kaolin, and then modified by laurylamine dipropylenediamine and gamma-glycidyl ether oxyethyl trimethoxysilane. The technical scheme can solve the problem of poor corrosion resistance of the overhead insulated cable in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a kind of corrosion-resistant overhead insulated cable and manufacturing method thereof. BACKGROUND

[0002] With the acceleration of industrial modernization process and the continuous advancement of infrastructure construction, the application scenarios of overhead insulated cable have gradually expanded from traditional areas to high corrosive and harsh fields such as ocean and coastal environment, chemical and metallurgical industry, which puts forward higher requirements for the corrosion resistance of overhead insulated cable. However, the mainstream overhead insulated cable on the current market generally has the problem of insufficient corrosion resistance. In high corrosive application scenarios, the cable will be gradually corroded and damaged, thereby causing safety accidents such as electric leakage and short circuit. This not only greatly shortens the service life of the cable, leading to a sharp rise in maintenance cost in the later period, but also poses a serious threat to industrial production safety and power system operation reliability.

[0003] To improve this problem, the existing technology often adds fillers with corrosion resistance such as kaolin to the cable insulation layer material to improve the corrosion resistance of overhead insulated cable. However, due to the high surface energy of kaolin, it is prone to particle agglomeration, which leads to uneven dispersion in the insulation layer, ultimately making the corrosion resistance improvement effect of overhead insulated cable not as expected. Therefore, it has become a key problem to be solved in the current industry to develop a kind of corrosion-resistant overhead insulated cable and manufacturing method thereof. SUMMARY

[0004] The present application provides a kind of corrosion-resistant overhead insulated cable and manufacturing method thereof, solve the problem of poor corrosion resistance of overhead insulated cable in the related art.

[0005] The technical scheme of the present application is as follows:

[0006] The present application provides a kind of corrosion-resistant overhead insulated cable, which includes conductor, shielding layer and insulation layer from inside to outside. The insulation layer includes the following components by weight: high density polyethylene 65-75 parts, modified kaolin 5-7 parts, ethylene-tetrafluoroethylene copolymer 13-17 parts, antioxidant 0.5-2 parts, plasticizer 1-3 parts, flame retardant 8-10 parts, lubricant 0.5-1.5 parts. The modified kaolin is first modified by vinyltriethoxysilane and then modified by laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane.

[0007] As a further technical solution, the mass ratio of laurylamine dipropylene diamine to γ-glycidyl ether oxyethyl trimethoxysilane is 1.2-1.5:1, preferably 1.3:1.

[0008] As a further technical solution, the mass ratio of the vinyltriethoxysilane and the kaolin is 1-3:5, preferably 2:5.

[0009] As a further technical solution, the preparation method of the modified kaolin comprises the following steps:

[0010] D1, dispersing the kaolin in xylene, adding vinyltriethoxysilane, mixing, and drying to obtain silanized kaolin;

[0011] D2, dispersing laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane in N,N-dimethylformamide, mixing to obtain a modifier;

[0012] D3, dispersing the silanized kaolin in a solvent, adding the modifier, mixing, and drying to obtain the modified kaolin.

[0013] As a further technical solution, the mass of the modifier is 13%-17% of the mass of the silanized kaolin, preferably 15%.

[0014] As a further technical solution, in step D1, the mass ratio of the kaolin and xylene is 4:35, and the mixing is carried out at 120-130°C for 7-9h.

[0015] As a further technical solution, in step D2, the mass ratio of laurylamine dipropylene diamine and N,N-dimethylformamide is 1:10, and the mixing is carried out at 45-55°C for 25-30h.

[0016] As a further technical solution, in step D3, the mass-volume ratio of the silanized kaolin and the solvent is 1g:9mL, the solvent is a sodium hydroxide aqueous solution with pH=12, the mixing is carried out at 25-35°C for 22-26h, and the drying is carried out at 90-110°C for 10-14h.

[0017] As a further technical solution, the raw materials of the flame retardant include methyl vinyl phenyl silicone rubber and pretreated expanded graphite; the pretreated expanded graphite is obtained by treating expanded graphite with 2-bromobenzyl alcohol.

[0018] As a further technical solution, the preparation method of the flame retardant comprises the following steps:

[0019] A1, dispersing 2-bromobenzyl alcohol in anhydrous ethanol, then adding expanded graphite, mixing, and drying to obtain pretreated expanded graphite;

[0020] A2, uniformly mixing the pretreated expanded graphite with methyl vinyl phenyl silicone rubber, melting, extruding and granulating to obtain the flame retardant.

[0021] In the corrosion-resistant overhead insulated cable, the expanded graphite is pretreated with 2-bromobenzyl alcohol, which can further improve the flame retardant performance of the flame retardant: on the one hand, as an organic modifier, the hydroxyl group in the molecular structure of 2-bromobenzyl alcohol can be combined with the hydroxyl group on the surface of the expanded graphite through hydrogen bonding, reducing the surface polarity of the graphite and imparting certain organic compatibility, thereby solving the problem of uneven dispersion of the expanded graphite in the methyl vinyl phenyl silicone rubber due to its strong surface polarity and easy agglomeration, and avoiding the failure of the flame retardant due to uneven dispersion; on the other hand, the 2-bromobenzyl alcohol molecule contains bromine element, and the bromine element adheres to the surface of the expanded graphite after pretreatment, which can play a flame-retardant role in the combustion process, forming a synergistic effect with the physical flame-retardant effect of the expanded graphite itself, and further improving the flame-retardant efficiency of the overall flame retardant.

[0022] At the same time, the silicon-oxygen bond in the methyl vinyl phenyl silicone rubber molecule can form a dense siloxane carbon layer during combustion, further enhancing the flame-retardant effect; when it is compounded with the pretreated expanded graphite, it not only can greatly improve the overall flame-retardant efficiency through the multi-component synergy of silicon element, bromine element and expanded graphite carbon layer, but also can improve the compatibility of the overall flame retardant with the high-density polyethylene matrix by virtue of the compatibility advantage of the organic silicon skeleton, thereby further improving the flame retardancy of the corrosion-resistant overhead insulated cable.

[0023] As a further technical solution, in step A1, the mixing is carried out at 50-60℃ for 4-6h.

[0024] As a further technical solution, the mass of the 2-bromobenzyl alcohol is 4%-6% of the mass of the expanded graphite, preferably 5%.

[0025] As a further technical solution, the mass ratio of the pretreated expanded graphite and the methyl vinyl phenyl silicone rubber is 4-7:5, preferably 6:5.

[0026] As a further technical solution, the expansion degree of the expanded graphite is 150-200 times.

[0027] As a further technical solution, the phenyl molar content in the methyl vinyl phenyl silicone rubber is 25%-35%, and the vinyl molar content is 0.2%-0.6%.

[0028] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1024 and antioxidant 168.

[0029] As a further technical solution, the lubricant includes one or both of paraffin and stearic acid.

[0030] As a further technical solution, the plasticizer includes one or both of dioctyl sebacate and trioctyl phosphate.

[0031] The application further provides a manufacturing method of the corrosion-resistant overhead insulated cable.

[0032] S1, coating the shielding layer on the outside of the conductor to obtain a semi-finished product;

[0033] S2, mixing raw materials of the insulation layer uniformly and extruding the semi-finished product to obtain the corrosion-resistant overhead insulated cable.

[0034] As a further technical solution, the conductor is a copper wire.

[0035] As a further technical solution, the shielding layer material is galvanized braided copper wire.

[0036] The working principle and advantages of the application are as follows:

[0037] In the corrosion-resistant overhead insulated cable, the addition of modified kaolin in the insulation layer significantly improves the corrosion resistance of the overhead insulated cable. When kaolin is added as a filler to the cable insulation layer, it is prone to agglomeration due to its high surface energy. In order to reduce the adverse effects of such agglomeration on the corrosion resistance of the cable insulation layer, the application first treats the kaolin with vinyl triethoxysilane to obtain silanized kaolin, and then modifies the silanized kaolin with laurylamine dipropylene diamine and gamma-glycidoxyethyl trimethoxysilane to obtain modified kaolin. The modified kaolin surface can form a large network-like wrapping layer, improving the hydrophobicity of the kaolin surface, thereby improving the uniformity of the kaolin in the overhead insulated cable insulation layer, and effectively improving the corrosion resistance of the corrosion-resistant overhead insulated cable. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0039] In the following examples and comparative examples, the high-density polyethylene is model DMDA-8907, the kaolin has a particle size of 45 μm, the ethylene-tetrafluoroethylene copolymer is model HT-2202, the methyl vinyl phenyl silicone rubber has a phenyl molar content of 30% and a vinyl molar content of 0.4%, the expanded graphite has an expansion degree of 180 times, and the paraffin wax is model 58# semi-refined paraffin wax.

[0040] Embodiment 1

[0041] A kind of corrosion-resistant overhead insulated cable, from inside to outside successively includes conductor, shielding layer, insulating layer, insulating layer includes the following weight parts components raw materials: high density polyethylene 65 parts, modified kaolin 5 parts, ethylene-tetrafluoroethylene copolymer 13 parts, antioxidant 1010 0.5 parts, dioctyl sebacate 1 part, flame retardant 8 parts, paraffin 0.5 parts;Wherein, flame retardant is methyl vinyl phenyl silicone rubber;

[0042] The preparation method of modified kaolin includes the following steps:

[0043] D1, kaolin is dispersed in o-xylene, vinyltriethoxysilane is added, after mixing at 125 DEG C for 8h, after drying, silanized kaolin is obtained;Wherein, the mass ratio of vinyltriethoxysilane and kaolin is 2:5;The mass ratio of kaolin and dimethylbenzene is 4:35;

[0044] D2, laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane with mass ratio of 1.2:1 are dispersed in N,N-dimethylformamide, mixed at 50 DEG C for 25h, to obtain a modifier;Wherein, the mass ratio of laurylamine dipropylene diamine and N,N-dimethylformamide is 1:10;

[0045] D3, silanized kaolin is dispersed in sodium hydroxide aqueous solution with pH=12, the modifier is added, mixed at 30 DEG C for 24h, dried at 100 DEG C for 12h to obtain modified kaolin;Wherein, the mass of the modifier is 15% of the mass of silanized kaolin, and the mass-volume ratio of silanized kaolin and solvent is 1g:9ml;

[0046] A kind of corrosion-resistant overhead insulated cable manufacturing method, comprising the following steps:

[0047] S1, galvanized braided copper wire is coated on the outer side of copper wire to obtain a semi-finished product;

[0048] S2, the raw materials of the insulating layer are mixed uniformly, and then extruded on the outer side of the semi-finished product to obtain a corrosion-resistant overhead insulated cable.

[0049] Embodiment 2

[0050] Compared with embodiment 1, the difference of embodiment 2 is only that the insulating layer of a kind of corrosion-resistant overhead insulated cable in this embodiment includes the following weight parts components raw materials: high density polyethylene 70 parts, modified kaolin 6 parts, ethylene-tetrafluoroethylene copolymer 15 parts, antioxidant 168 1.2 parts, dioctyl sebacate 1 part, tri-octyl phosphate 1 part, flame retardant 9 parts, paraffin 1 part;Wherein, flame retardant is methyl vinyl phenyl silicone rubber.

[0051] Example 3

[0052] Compared with Example 1, the difference of Example 3 is only that the insulating layer of the corrosion-resistant aerial insulated cable in the example comprises raw materials in the following weight parts: high-density polyethylene 75 parts, modified kaolin 7 parts, ethylene-tetrafluoroethylene copolymer 17 parts, antioxidant 1024 2 parts, tricresyl phosphate 3 parts, flame retardant 10 parts, and stearic acid 1.5 parts; wherein the flame retardant is methyl vinyl phenyl silicone rubber.

[0053] Example 4

[0054] Compared with Example 1, the difference of Example 4 is only that in the preparation method of the modified kaolin in the example, the mass ratio of laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane is 1.3:1.

[0055] Example 5

[0056] Compared with Example 1, the difference of Example 5 is only that in the preparation method of the modified kaolin in the example, the mass ratio of laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane is 1.5:1.

[0057] Example 6

[0058] Compared with Example 1, the difference of Example 6 is only that in the preparation method of the flame retardant in the example, the following steps are included:

[0059] A1, dispersing 2-bromobenzyl alcohol in anhydrous ethanol, then adding expanded graphite, mixing at 55°C for 5h, and drying to obtain pretreated expanded graphite; wherein the mass of 2-bromobenzyl alcohol is 4% of the mass of expanded graphite; the mass-volume ratio of expanded graphite to anhydrous ethanol is 1g:12mL;

[0060] A2, mixing the pretreated expanded graphite and methyl vinyl phenyl silicone rubber in a mass ratio of 6:5 uniformly, melting, and extruding and granulating to obtain the flame retardant.

[0061] Example 7

[0062] Compared with Example 6, the difference of Example 7 is only that in the preparation method of the flame retardant in the example, the mass of 2-bromobenzyl alcohol is 5% of the mass of expanded graphite.

[0063] Example 8

[0064] Compared with Example 6, the difference of Example 8 is only that in the preparation method of the flame retardant in the example, the mass of 2-bromobenzyl alcohol is 6% of the mass of expanded graphite.

[0065] Example 9

[0066] The difference between Example 9 and Example 6 is only that the preparation method of the flame retardant in the present example comprises the following steps: mixing expandable graphite and methylvinylphenyl silicone rubber in a mass ratio of 6:5, melting, extruding and granulating to obtain the flame retardant.

[0067] Comparative Example 1

[0068] The difference between Comparative Example 1 and Example 1 is only that the modified kaolin in the present comparative example is replaced by an equal amount of kaolin.

[0069] Comparative Example 2

[0070] The difference between Comparative Example 2 and Example 1 is only that the preparation method of the modified kaolin in the present comparative example comprises the following steps: dispersing kaolin in o-xylene, adding vinyltriethoxysilane, mixing at 125°C for 8h, and then drying to obtain the modified kaolin; wherein the mass ratio of vinyltriethoxysilane to kaolin is 2:5, and the mass ratio of kaolin to dimethylbenzene is 4:35.

[0071] Comparative Example 3

[0072] The difference between Comparative Example 3 and Example 1 is only that the preparation method of the modified kaolin in the present comparative example comprises the following steps: dispersing laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane in a mass ratio of 1.2:1 in N,N-dimethylformamide, mixing at 50°C for 25h to obtain the modifier; wherein the mass ratio of laurylamine dipropylene diamine to N,N-dimethylformamide is 1:10.

[0073] Dispersing kaolin in a sodium hydroxide aqueous solution with pH=12, adding the modifier, mixing at 30°C for 24h, and then drying at 100°C for 12h to obtain the modified kaolin; wherein the mass of the modifier is 15% of the mass of the kaolin, and the mass-volume ratio of the kaolin to the solvent is 1g:9mL.

[0074] Comparative Example 4

[0075] The difference between Comparative Example 4 and Example 1 is only that the γ-glycidyl ether oxyethyl trimethoxysilane in the present comparative example is replaced by an equal amount of silane coupling agent KH560.

[0076] The insulation layer of the corrosion-resistant aerial insulated cable prepared in Examples 1-9 and Comparative Examples 1-4 is tested according to the following method:

[0077] 1. Corrosion resistance test: the insulation layer of the corrosion resistant overhead insulated cable is immersed in 45g / L oxalic acid aqueous solution, and the tensile strength of the insulation layer of the corrosion resistant overhead insulated cable before immersion and the tensile strength of the insulation layer of the corrosion resistant overhead insulated cable after immersion for 3d at 23±2℃ are determined according to the determination method in GB / T2951.11-2008 "General test methods for cable and optical cable insulation and sheath materials"; the sample for determination is a dumbbell type with a thickness of 1.5mm, and the moving speed of the chuck is 20mm / min.

[0078] 2. Flame retardant performance test: the oxygen index of the insulation layer of the corrosion resistant overhead insulated cable is tested according to the test method specified in GB / T2406.2-2009 "Determination of flammability of plastics - Part 2: test method at room temperature", wherein the sample type is I, and the ignition method is A.

[0079] The test results are shown in Tables 1-2:

[0080] Table 1: Test results of the corrosion resistance of the insulation layer of the corrosion resistant overhead insulated cable

[0081]

[0082] From the data in Table 1, it can be seen that Examples 1-5 and Comparative Example 1 show that the addition of the modified kaolin of the present application can further improve the corrosion resistance of the corrosion resistant overhead insulated cable.

[0083] Table 2: Test results of the flame retardant performance of the insulation layer of the corrosion resistant overhead insulated cable

[0084]

[0085] From the data in Table 2, it can be seen that Examples 1, 6-9 show that when the flame retardant is composed of methylvinylphenyl silicone rubber and 2-bromobenzyl alcohol pretreated expanded graphite, the flame retardant performance of the corrosion resistant overhead insulated cable can be further improved.

[0086] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A corrosion resistant aerial insulated electrical cable, characterized in that, From inside to outside in turn includes conductor, shielding layer, insulating layer, the insulating layer includes the following weight parts components raw materials: high density polyethylene 65~75 parts, modified kaolin 5~7 parts, ethylene-tetrafluoroethylene copolymer 13~17 parts, antioxidant 0.5~2 parts, plasticizer 1~3 parts, flame retardant 8~10 parts, lubricant 0.5~1.5 parts;The modified kaolin is that kaolin is first modified by ethenyl triethoxy silane to obtain silanized kaolin, and then is secondly modified by laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane to obtain; The mass ratio of the ethenyl triethoxy silane and kaolin is 1~3:5; The mass of the laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane is 13%~17% of the mass of the silanized kaolin; The mass ratio of the laurylamine dipropylene diamine and the γ-glycidyl ether oxyethyl trimethoxysilane is 1.2~1.5:

1.

2. The corrosion resistant aerial bundled conductor cable of claim 1, wherein, The preparation method of the modified kaolin includes the following steps: D1, disperse kaolin in xylene, add ethenyl triethoxy silane, mix and dry to obtain silanized kaolin; D2, disperse laurylamine dipropylene diamine and γ-glycidyl ether oxyethyl trimethoxysilane in N,N-dimethylformamide, mix to obtain a modifier; D3, disperse the silanized kaolin in a solvent, add the modifier, mix and dry to obtain modified kaolin.

3. The corrosion resistant aerial bundled conductor cable of claim 1, wherein, The raw materials of the flame retardant include methyl vinyl phenyl silicone rubber and pretreated expanded graphite;The pretreated expanded graphite is obtained by treating expanded graphite with 2-bromobenzyl alcohol.

4. The corrosion resistant aerial bundle conductor of claim 3, wherein, The preparation method of the flame retardant includes the following steps: A1, disperse 2-bromobenzyl alcohol in anhydrous ethanol, then add expanded graphite, mix and dry to obtain pretreated expanded graphite; A2, mix the pretreated expanded graphite and methyl vinyl phenyl silicone rubber uniformly, melt, extrude and granulate to obtain a flame retardant.

5. A corrosion resistant aerial bundle conductor cable according to claim 4, wherein, The mass of the 2-bromobenzyl alcohol is 4%~6% of the mass of the expanded graphite.

6. The corrosion resistant aerial bundle conductor cable of claim 3, wherein, The phenyl molar content in the methyl vinyl phenyl silicone rubber is 25%~35%, and the vinyl molar content is 0.2%~0.6%.

7. A method of manufacturing a corrosion resistant overhead insulated cable for manufacturing a corrosion resistant overhead insulated cable as claimed in any one of claims 1 to 6, characterized in that, The method includes the following steps: S1, coat the shielding layer on the outer side of the conductor to obtain a semi-finished product; S2, mix the raw materials of the insulating layer uniformly, extrude and coat on the outer side of the semi-finished product to obtain a corrosion-resistant aerial insulated cable.

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