CN117285772B - Flame-retardant power cable and production process thereof - Google Patents
Flame-retardant power cable and production process thereof Download PDFInfo
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- CN117285772B CN117285772B CN202311575431.6A CN202311575431A CN117285772B CN 117285772 B CN117285772 B CN 117285772B CN 202311575431 A CN202311575431 A CN 202311575431A CN 117285772 B CN117285772 B CN 117285772B
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- flame
- retardant
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- expandable graphite
- power cable
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 126
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 48
- 239000010439 graphite Substances 0.000 claims abstract description 48
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 46
- 239000004917 carbon fiber Substances 0.000 claims abstract description 46
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 229920000642 polymer Polymers 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000004020 conductor Substances 0.000 claims abstract description 21
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 17
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 14
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 14
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 7
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 74
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 51
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 40
- 239000004408 titanium dioxide Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 25
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 229960000583 acetic acid Drugs 0.000 claims description 15
- 235000019441 ethanol Nutrition 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 229940064002 calcium hypophosphite Drugs 0.000 claims description 10
- 229910001382 calcium hypophosphite Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 10
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 10
- CNALVHVMBXLLIY-IUCAKERBSA-N tert-butyl n-[(3s,5s)-5-methylpiperidin-3-yl]carbamate Chemical compound C[C@@H]1CNC[C@@H](NC(=O)OC(C)(C)C)C1 CNALVHVMBXLLIY-IUCAKERBSA-N 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 9
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- CGFYHILWFSGVJS-UHFFFAOYSA-N silicic acid;trioxotungsten Chemical compound O[Si](O)(O)O.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 CGFYHILWFSGVJS-UHFFFAOYSA-N 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 239000012362 glacial acetic acid Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005253 cladding Methods 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 8
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 8
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000779 smoke Substances 0.000 description 5
- 229940037312 stearamide Drugs 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 229920002554 vinyl polymer Polymers 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000009777 vacuum freeze-drying Methods 0.000 description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 3
- 239000008116 calcium stearate Substances 0.000 description 3
- 235000013539 calcium stearate Nutrition 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical class [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 description 1
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of power cables, and provides a flame-retardant power cable and a production process thereof, wherein the power cable comprises a wire core conductor, an insulating sleeve and a flame-retardant sheath, the wire core conductor is externally coated with the insulating sleeve, the insulating sleeve is externally coated with the flame-retardant sheath, and the flame-retardant sheath comprises the following raw materials in parts by weight: 100 parts of high polymer, 18-23 parts of composite flame retardant, 2.5-3.3 parts of carbon fiber, 0.2-0.3 part of silane coupling agent, 1-1.5 parts of antioxidant, 1-2 parts of lubricant and 0.6-1.1 part of cross-linking agent; the composite flame retardant consists of the following raw materials in percentage by mass: 65% -78% of modified expandable graphite and 22% -35% of carbon nano tube; the flame-retardant sheath of the power cable has high flame-retardant efficiency, good effect and excellent mechanical property.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a flame-retardant power cable and a production process thereof.
Background
The power cable is a cable for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply in industrial and mining enterprises and power transmission lines under sea water passing through the river, and is a cable product for transmitting and distributing high-power electric energy in a main line of a power system.
The polymer insulating material used for the current power cable is a combustible material, and in the power transmission process, the cable is burnt possibly due to the reasons of cable heating, cable short circuit, fire disaster and the like, and serious damage is caused to life and property, so that the polymer insulating material is required to be subjected to flame retardant modification to prepare the flame-retardant cable. For the flame-retardant cable, the flame can be controlled to spread in a specific range when the cable burns no matter the cable is a single cable or is laid in a bundle, so that a great disaster caused by cable fire is avoided, and the fire-proof level of a cable line is improved.
The flame-retardant electric cable generally adopts a method that a halogen-containing material is added into a sheath material, and the flame-retardant electric cable has good effect from the viewpoint of flame retardance, but because the halogen is contained in the material, a large amount of smoke and hydrogen halide gas are released during combustion, the visibility during fire is low, great obstruction is brought to safe evacuation and fire protection of personnel, and the personnel are easy to suffocate and kill because of toxic gas. Therefore, with the continuous improvement of the technological level, the used flame retardant has further developed from halogen-containing flame retardant to low-halogen and halogen-free flame retardant.
The domestic patent application with the application number of CN202310499358.2 discloses a flame-retardant high-voltage cable, which comprises a conductive inner core and an insulating layer coating the conductive inner core, wherein the raw materials of the insulating layer comprise the following components in weight: 100-200 parts of polymer, 25-50 parts of flame retardant, 5-10 parts of dispersing agent, 3-10 parts of stacked graphene and 1-5 parts of modified hydrotalcite, wherein: the polymer comprises one or more of low density polyethylene and ethylene-vinyl acetate copolymer; the flame retardant comprises one or more of aluminum hydroxide, magnesium hydroxide and calcium carbonate. The prepared cable has good flame retardant effect, and the cable insulating layer has good heat conduction effect. However, as a large amount of metal salt flame retardant is added into the sheath, the smoke amount is small, toxic gas is not generated, but the mechanical property of the flame retardant material is seriously affected due to the large mixing amount, so that the mechanical property of the flame retardant material is not good enough, and the service performance of the power cable is directly affected. Therefore, the development of the flame-retardant sheath with excellent flame retardant property and higher mechanical property has important significance for the development of the flame-retardant power cable.
Disclosure of Invention
The invention aims to provide a flame-retardant power cable and a production process thereof, and the flame-retardant sheath of the obtained power cable has high flame-retardant efficiency, good effect and excellent mechanical property.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the utility model provides a fire-retardant type power cable, the power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, the cladding has insulating cover outside the sinle silk conductor, insulating cover outsourcing has fire-retardant sheath, the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 18-23 parts of composite flame retardant, 2.5-3.3 parts of carbon fiber, 0.2-0.3 part of silane coupling agent, 1-1.5 parts of antioxidant, 1-2 parts of lubricant and 0.6-1.1 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65-78% of modified expandable graphite and 22-35% of carbon nano tube.
Preferably, the high molecular polymer consists of the following raw materials in percentage by mass: 70-80% of linear low-density polyethylene resin and 20-30% of ethylene-vinyl acetate copolymer.
Preferably, the preparation method of the modified expandable graphite comprises the following steps:
placing an aqueous hypophosphite solution in a reaction kettle, and then adding expandable graphite; sealing the reaction kettle, heating to 70-80 ℃ while stirring, and continuing constant-temperature stirring for 4-10h; and cooling to 50-55 ℃, then dropwise adding a silicotungstic acid aqueous solution, continuing to stir at constant temperature for 10-17h after the dropwise adding is finished, and then performing suction filtration, ethanol washing and vacuum freeze drying to obtain the modified expandable graphite.
Preferably, in the hypophosphite aqueous solution, solutes are calcium hypophosphite and ferric hypophosphite, wherein the mass fraction of the calcium hypophosphite is 10-16%, and the mass fraction of the ferric hypophosphite is 3-6%; the mass fraction of the silicotungstate in the silicotungstate aqueous solution is 8% -15%; the mass ratio of the expandable graphite to the hypophosphite aqueous solution to the silicotungstic acid aqueous solution is 5:18-30:5-9.
Preferably, the silicotungstate is sodium silicotungstate.
Preferably, the carbon fiber has a diameter of 5-10 μm and a length of 0.1-0.5mm.
Preferably, the carbon fiber is titanium dioxide coated carbon fiber.
Preferably, the preparation method of the titanium dioxide coated carbon fiber comprises the following steps of;
s1, mixing the materials with the mass ratio of 8-11: mixing tetra-n-butyl titanate and absolute ethyl alcohol of 26-33 to obtain a reaction solution, and then mixing the following components in mass ratio of 25-30:11-15:10, glacial acetic acid and distilled water to obtain an ethanol and acetic acid mixed solution, wherein the mass ratio of the distilled water to the tetra-n-butyl titanate used in the reaction solution is 1:1.9-2.2; then, keeping the temperature of the reaction solution at 28-33 ℃, dropwise adding a mixed solution of ethanol and acetic acid into the reaction solution while stirring, and continuously stirring for 1-1.5h after the dropwise adding is finished to obtain titanium dioxide sol;
s2, immersing carbon fibers into the titanium dioxide sol, continuously stirring for 1h, putting the carbon fibers loaded with the titanium dioxide sol into a spin dryer for spin-drying treatment, drying at 75-80 ℃, calcining at 470-500 ℃ for 2-2.5h under the protection of argon atmosphere, and cooling to room temperature to obtain the titanium dioxide coated carbon fibers.
Preferably, the cross-linking agent consists of the following components in percentage by mass: 2-3 of dicumyl peroxide and trimethylolpropane trimethacrylate.
In addition, the silane coupling agent is at least one of gamma-methacryloxypropyl trimethoxy silane and gamma-aminopropyl triethoxy silane, and the antioxidant is at least one of antioxidant 168 and antioxidant 1010; the lubricant is at least one of calcium stearate and vinyl bis-stearamide.
The production process of the flame-retardant power cable comprises the following steps: firstly, the insulating sleeve is coated outside the wire core conductor, then the raw materials of the flame-retardant sheath are uniformly mixed and then are melt-blended, and the flame-retardant sheath is extruded and molded and coated outside the insulating sleeve.
The invention has the technical effects that:
the flame retardant sheath of the electric cable is added with the composite flame retardant, the composite flame retardant comprises the modified expandable graphite, hypophosphite and silicotungstic acid salt are adsorbed and deposited in the expandable graphite through the specific process, the flame retardance of the expandable graphite is improved, phosphorus in the hypophosphite can generate substances such as phosphorus oxide and phosphate and react with free radicals generated by combustion to form a compound which is not easy to burn, the combustion temperature can be reduced, further flame retardance is carried out, and on the basis, the silicotungstic acid salt can promote the polymer to be solidified into carbon and can reduce the generation of combustion heat and the release of smoke. According to the invention, the hypophosphite and the silicotungstate are mixed and hybridized for modification, so that better flame retardant efficiency can be achieved compared with unmodified expandable graphite, and the dispersion performance of the expandable graphite is improved.
The composite flame retardant also comprises the carbon nano tube, wherein the carbon nano tube absorbs more heat than a polymer matrix, slows down the degradation of a high polymer, is matched with modified expandable graphite, exerts flame retardant advantage in a synergistic way, improves flame retardant effect, and can also enable the flame retardant sheath of the obtained electric cable to keep higher mechanical property level and have strong service performance.
According to the invention, the titanium dioxide coated carbon fiber is further added into the flame-retardant sheath, so that the tensile strength and the like of the flame-retardant sheath can be increased, and the possibility damage to the carbon fiber during combustion can be further reduced due to the titanium dioxide coated outside the carbon fiber, so that the flame-retardant sheath is beneficial to maintaining the mechanical property of the flame-retardant sheath and the continuous use of the power cable.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a specific embodiment of the present invention, three modified expandable graphites are prepared. Specifically, the preparation methods of the modified expandable graphite I, the modified expandable graphite II and the modified expandable graphite III are as follows:
(1) the preparation method of the modified expandable graphite I comprises the following steps:
placing 30 parts of hypophosphite aqueous solution into a reaction kettle, wherein the solute is calcium hypophosphite and iron hypophosphite, the mass fraction of the calcium hypophosphite is 15%, and the mass fraction of the iron hypophosphite is 5%; then adding 5 parts of expandable graphite (scaly expandable graphite of 130-150 meshes); sealing the reaction kettle, heating to 75 ℃ while stirring, and continuously stirring at constant temperature for 10 hours; and cooling to 55 ℃, then dropwise adding 5 parts of sodium silicotungstate aqueous solution with the mass fraction of 10%, continuously stirring at constant temperature for 10 hours after the dropwise adding is finished, and then carrying out suction filtration, ethanol washing and vacuum freeze drying to obtain the modified expandable graphite I.
(2) The preparation method of the modified expandable graphite II comprises the following steps:
placing 18 parts of hypophosphite aqueous solution into a reaction kettle, wherein the solute is calcium hypophosphite and ferric hypophosphite, the mass fraction of the calcium hypophosphite is 10%, and the mass fraction of the ferric hypophosphite is 6%; then adding 5 parts of expandable graphite (80-100 mesh scaly expandable graphite); sealing the reaction kettle, heating to 70 ℃ while stirring, and continuing constant-temperature stirring for 5 hours; and cooling to 53 ℃, then dropwise adding 9 parts of 8% sodium silicotungstate aqueous solution, continuously stirring at constant temperature for 17 hours after the dropwise adding is finished, and then carrying out suction filtration, ethanol washing and vacuum freeze drying to obtain the modified expandable graphite II.
(3) The preparation method of the modified expandable graphite III comprises the following steps:
placing 25 parts of hypophosphite aqueous solution into a reaction kettle, wherein the solute is calcium hypophosphite and ferric hypophosphite, the mass fraction of the calcium hypophosphite is 16%, and the mass fraction of the ferric hypophosphite is 3%; then adding 5 parts of expandable graphite (80-100 mesh scaly expandable graphite); sealing the reaction kettle, heating to 80 ℃ while stirring, and continuing constant-temperature stirring for 4 hours; and cooling to 50 ℃, then dropwise adding 7 parts of sodium silicotungstate aqueous solution with the mass fraction of 15%, continuously stirring at constant temperature for 13 hours after the dropwise adding is finished, and then carrying out suction filtration, ethanol washing and vacuum freeze drying to obtain the modified expandable graphite.
In the specific embodiment of the invention, three titanium dioxide coated carbon fibers are prepared, and the specific preparation methods of the titanium dioxide coated carbon fiber I, the titanium dioxide coated carbon fiber II and the titanium dioxide coated carbon fiber III are as follows:
(1) the preparation method of the titanium dioxide coated carbon fiber I comprises the following steps:
s1, the mass ratio is 10:33, and absolute ethanol, and then mixing the tetrabutyl titanate and the absolute ethanol to obtain a reaction solution, wherein the mass ratio of the reaction solution is 25:13:10, glacial acetic acid and distilled water to obtain an ethanol and acetic acid mixed solution, wherein the mass ratio of the distilled water to the tetra-n-butyl titanate used in the reaction solution is 1:2; then, keeping the temperature of the reaction solution at 30 ℃, dropwise adding a mixed solution of ethanol and acetic acid into the reaction solution while stirring, and continuously stirring for 1h after the dropwise adding is finished to obtain titanium dioxide sol;
s2, immersing carbon fiber with the diameter of 8 mu m and the length of 0.2mm into the titanium dioxide sol, continuously stirring for 1h, putting the carbon fiber loaded with the titanium dioxide sol into a spin dryer for spin drying treatment, drying at 80 ℃, calcining for 2h at 500 ℃ under the protection of argon atmosphere, and cooling to room temperature to obtain the titanium dioxide coated carbon fiber I.
(2) The preparation method of the titanium dioxide coated carbon fiber II comprises the following steps:
s1, the mass ratio is 11:30, tetra-n-butyl titanate and absolute ethyl alcohol are mixed to obtain a reaction solution, and then the mass ratio is 28:11:10, glacial acetic acid and distilled water to obtain an ethanol and acetic acid mixed solution, wherein the mass ratio of the distilled water to the tetra-n-butyl titanate used in the reaction solution is 1:2.2; then, keeping the temperature of the reaction solution at 28 ℃, dropwise adding a mixed solution of ethanol and acetic acid into the reaction solution while stirring, and continuously stirring for 1.5 hours after the dropwise adding is finished to obtain titanium dioxide sol;
s2, immersing carbon fibers with the diameter of 5 mu m and the length of 0.1mm into the titanium dioxide sol, continuously stirring for 1h, putting the carbon fibers loaded with the titanium dioxide sol into a spin dryer for spin drying treatment, drying at 75 ℃, calcining for 2h at 490 ℃ under the protection of argon atmosphere, and cooling to room temperature to obtain the titanium dioxide coated carbon fibers II.
(3) The preparation method of the titanium dioxide coated carbon fiber III comprises the following steps:
s1, the mass ratio is 8:26, tetra-n-butyl titanate and absolute ethyl alcohol are mixed to obtain a reaction solution, and then the mass ratio is 30:15:10, glacial acetic acid and distilled water to obtain an ethanol and acetic acid mixed solution, wherein the mass ratio of the distilled water to the tetra-n-butyl titanate used in the reaction solution is 1:1.9; then, keeping the temperature of the reaction solution at 33 ℃, dropwise adding a mixed solution of ethanol and acetic acid into the reaction solution while stirring, and continuously stirring for 1h after the dropwise adding is finished to obtain titanium dioxide sol;
s2, immersing carbon fibers with the diameter of 10 mu m and the length of 0.5mm into the titanium dioxide sol, continuously stirring for 1h, putting the carbon fibers loaded with the titanium dioxide sol into a spin dryer for spin drying treatment, drying at 78 ℃, calcining for 2.5h at 470 ℃ under the protection of argon atmosphere, and cooling to room temperature to obtain the titanium dioxide coated carbon fibers III.
In the following examples, a flame retardant electric cable was specifically prepared, and a linear low density polyethylene resin was used as a raw material for a flame retardant sheath, and had a density of 0.924/g/cm 3 Product model LL4004EL; the ethylene-vinyl acetate copolymer manufacturer is Exxon Mobil, the vinyl acetate content is 27.5%, and the product model is UL00728.
Example 1:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 20 parts of composite flame retardant, 3 parts of carbon fiber, 0.3 part of gamma-aminopropyl triethoxysilane, 168.2 parts of antioxidant, 1 part of calcium stearate and 1 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 70% of modified expandable graphite II and 30% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 73% of linear low-density polyethylene resin and 27% of ethylene-vinyl acetate copolymer; the diameter of the carbon fiber is 10 mu m, and the length is 0.5mm; the cross-linking agent comprises the following components in percentage by mass: 2 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant power cable comprises the following steps of: firstly, the insulating sleeve is coated outside the wire core conductor, then the raw materials of the flame-retardant sheath are uniformly mixed and then are melt-blended, and the flame-retardant sheath is extruded and molded and coated outside the insulating sleeve.
Example 2:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 22 parts of composite flame retardant, 2.5 parts of carbon fiber, 0.25 part of gamma-methacryloxypropyl trimethoxy silane, 168 parts of antioxidant, 1.5 parts of calcium stearate and 1 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 75% of modified expandable graphite III and 25% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 70% of linear low-density polyethylene resin and 30% of ethylene-vinyl acetate copolymer; the diameter of the carbon fiber is 10 mu m, and the length is 0.5mm; the cross-linking agent comprises the following components in percentage by mass: 2 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant electric cable is the same as that of the embodiment 1.
Example 3:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 23 parts of composite flame retardant, 3 parts of carbon fiber, 0.2 part of gamma-aminopropyl triethoxysilane, 1.5 parts of antioxidant 1010, 1.3 parts of vinyl bis stearamide and 0.6 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65% of modified expandable graphite I and 35% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 75% of linear low-density polyethylene resin and 25% of ethylene-vinyl acetate copolymer; the carbon fiber had a diameter of 10 μm and a length of 0.5mm. The cross-linking agent comprises the following components in percentage by mass: 3 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant electric cable is the same as that of the embodiment 1.
Example 4:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 23 parts of composite flame retardant, 3 parts of titanium dioxide coated carbon fiber I, 0.2 part of gamma-aminopropyl triethoxysilane, 1.5 parts of antioxidant 1010, 1.3 parts of vinyl bis stearamide and 0.6 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65% of modified expandable graphite I and 35% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 75% of linear low-density polyethylene resin and 25% of ethylene-vinyl acetate copolymer. The cross-linking agent comprises the following components in percentage by mass: 3 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant electric cable is the same as that of the embodiment 1.
Example 5:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 23 parts of composite flame retardant, 3 parts of titanium dioxide coated carbon fiber II, 0.2 part of gamma-aminopropyl triethoxysilane, 1.5 parts of antioxidant 1010, 1.3 parts of vinyl bis stearamide and 0.6 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65% of modified expandable graphite I and 35% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 75% of linear low-density polyethylene resin and 25% of ethylene-vinyl acetate copolymer. The cross-linking agent comprises the following components in percentage by mass: 3 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant electric cable is the same as that of the embodiment 1.
Example 6:
the utility model provides a fire-retardant type power cable, power cable includes sinle silk conductor, insulating cover and fire-retardant sheath, and the cladding has insulating cover outside the sinle silk conductor, and the cladding has fire-retardant sheath outside the insulating cover, and the raw materials of fire-retardant sheath include following components by weight: 100 parts of high polymer, 23 parts of composite flame retardant, 3 parts of titanium dioxide coated carbon fiber III, 0.2 part of gamma-aminopropyl triethoxysilane, 1.5 parts of antioxidant, 1.3 parts of vinyl bis stearamide and 0.6 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65% of modified expandable graphite I and 35% of carbon nano tube.
The high-molecular polymer consists of the following raw materials in percentage by mass: 75% of linear low-density polyethylene resin and 25% of ethylene-vinyl acetate copolymer. The cross-linking agent comprises the following components in percentage by mass: 3 and trimethylolpropane trimethacrylate.
The production process of the flame-retardant electric cable is the same as that of the embodiment 1.
Comparative example 1:
unlike example 1, the modified expandable graphite II was replaced with expandable graphite (130-150 mesh flake expandable graphite).
Comparative example 2:
unlike example 1, the carbon nanotubes were replaced with an equal amount of modified expandable graphite II.
Performance test:
1. the flame retardant performance of the flame retardant sheath in the electric cable is tested, and the limit oxygen index is tested according to GB/T2406-2009 "oxygen index method for plastics to determine combustion behavior"; the combustion performance is tested according to GB/T2408-2008 horizontal and vertical methods for testing the combustion performance of plastics; the total amount of heat released and the total amount of smoke produced were tested according to GBT31248-2014 test method for flame spread heat release and smoke production characteristics of electric or optical cables under fire conditions. The specific test results are shown in table 1.
TABLE 1 flame retardant Property test results
As can be seen from Table 1, in the composite flame retardant of the invention, when the hypophosphite and the silicotungstate are adopted to modify the expandable graphite, the composite flame retardant has good flame retardant effect on the polymer. Meanwhile, as can be seen from comparison of comparative examples 1-2 and example 1, the flame retardant property is obviously improved by modifying the expandable graphite, and the flame retardant property is further improved by using the modified expandable graphite and the carbon nano tube together as the flame retardant.
2. The mechanical property of the flame-retardant sheath in the electric cable is tested, and the mechanical property is tested according to GB/T1040.1-2018 'determination of plastic tensile property', and the tensile strength and the elongation at break are specifically determined. The specific test results are shown in table 2.
TABLE 2 mechanical test results
| Elongation at break/% | Tensile Strength/MPa | |
| Example 1 | 284 | 21.5 |
| Example 2 | 279 | 21.2 |
| Example 3 | 286 | 21.9 |
| Example 4 | 293 | 23.8 |
| Example 5 | 291 | 23.4 |
| Example 6 | 294 | 23.9 |
| Comparative example 1 | 283 | 21.3 |
| Comparative example 2 | 267 | 18.5 |
As can be seen from Table 2, the electric cables in examples 1-6 of the present invention have excellent mechanical properties, and in addition, as can be seen from comparison of examples 1 and comparative examples 1-2, the modified expandable graphite and the expandable graphite have equivalent influence on the mechanical properties of the flame retardant sheath, and the mechanical properties of the flame retardant sheath can be improved by adding the modified expandable graphite and the carbon nanotubes together as flame retardants.
In examples 1-6, the mechanical properties of the flame-retardant sheaths of examples 4-6 are higher, which means that the mechanical properties of the flame-retardant sheaths are further improved by adding the carbon fiber coated with titanium dioxide into the flame-retardant sheaths.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The flame-retardant power cable is characterized by comprising a cable core conductor, an insulating sleeve and a flame-retardant sheath, wherein the cable core conductor is externally coated with the insulating sleeve, the insulating sleeve is externally coated with the flame-retardant sheath, and the raw materials of the flame-retardant sheath comprise the following components in parts by weight: 100 parts of high polymer, 18-23 parts of composite flame retardant, 2.5-3.3 parts of carbon fiber, 0.2-0.3 part of silane coupling agent, 1-1.5 parts of antioxidant, 1-2 parts of lubricant and 0.6-1.1 part of cross-linking agent;
the composite flame retardant consists of the following raw materials in percentage by mass: 65% -78% of modified expandable graphite and 22% -35% of carbon nano tube;
the high-molecular polymer consists of the following raw materials in percentage by mass: 70-80% of linear low-density polyethylene resin and 20-30% of ethylene-vinyl acetate copolymer;
the preparation method of the modified expandable graphite comprises the following steps:
adding expandable graphite to an aqueous hypophosphite solution; heating to 70-80deg.C under stirring, and continuously stirring at constant temperature for 4-10 hr; cooling to 50-55 ℃, then dropwise adding a silicotungstic acid aqueous solution, continuing to stir at constant temperature for 10-17 hours after the dropwise adding is finished, and then carrying out suction filtration, ethanol washing and drying to obtain the modified expandable graphite;
in the hypophosphite aqueous solution, solutes are calcium hypophosphite and ferric hypophosphite, the mass fraction of the calcium hypophosphite is 10% -16%, and the mass fraction of the ferric hypophosphite is 3% -6%; the mass fraction of the silicotungstate in the silicotungstate aqueous solution is 8% -15%; the mass ratio of the expandable graphite to the hypophosphite aqueous solution to the silicotungstic acid aqueous solution is 5:18-30:5-9;
the silicon tungstate is sodium silicotungstate;
the carbon fiber is titanium dioxide coated carbon fiber;
the preparation method of the titanium dioxide coated carbon fiber comprises the following steps of;
s1, mixing the materials with the mass ratio of 8-11: mixing tetra-n-butyl titanate and absolute ethyl alcohol of 26-33 to obtain a reaction solution, and then mixing the following components in mass ratio of 25-30:11-15:10, glacial acetic acid and distilled water to obtain an ethanol and acetic acid mixed solution, wherein the mass ratio of the distilled water to the tetra-n-butyl titanate is 1:1.9-2.2; then, keeping the temperature of the reaction solution at 28-33 ℃, dropwise adding a mixed solution of ethanol and acetic acid into the reaction solution while stirring, and continuously stirring for 1-1.5h after the dropwise adding is finished to obtain titanium dioxide sol;
s2, immersing carbon fibers into the titanium dioxide sol, continuously stirring for 1h, spin-drying the carbon fibers loaded with the titanium dioxide sol, drying at 75-80 ℃, calcining at 470-500 ℃ for 2-2.5h under the protection of argon atmosphere, and cooling to room temperature to obtain the titanium dioxide coated carbon fibers.
2. The flame retardant electric power cable according to claim 1, wherein the carbon fiber has a diameter of 5-10 μm and a length of 0.1-0.5mm.
3. The flame retardant power cable of claim 1, wherein the cross-linking agent consists of the following components in mass ratio of 1:2-3 of dicumyl peroxide and trimethylolpropane trimethacrylate.
4. A process for producing a flame retardant electric power cable according to any one of claims 1-3, comprising the steps of: firstly, the insulating sleeve is coated outside the wire core conductor, then the raw materials of the flame-retardant sheath are uniformly mixed and then are melt-blended, and the flame-retardant sheath is extruded and molded and coated outside the insulating sleeve.
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| CN112646263A (en) * | 2020-12-21 | 2021-04-13 | 河北中联银杉新材料有限公司 | Cable insulation material |
| WO2023099139A1 (en) * | 2021-11-30 | 2023-06-08 | Velaworks S. R. O. | Fire retardant composition |
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| WO2000009606A1 (en) * | 1998-08-13 | 2000-02-24 | E.I. Du Pont De Nemours And Company | Fire and electrical resistant compositions |
| CN103910907A (en) * | 2013-01-05 | 2014-07-09 | 合肥杰事杰新材料股份有限公司 | Method for modifying melamine pyrophosphate fire retardant by grafting oxidized graphene |
| CN112143030A (en) * | 2019-06-28 | 2020-12-29 | 合肥杰事杰新材料股份有限公司 | Nylon flame-retardant filler and preparation method thereof |
| CN112646263A (en) * | 2020-12-21 | 2021-04-13 | 河北中联银杉新材料有限公司 | Cable insulation material |
| WO2023099139A1 (en) * | 2021-11-30 | 2023-06-08 | Velaworks S. R. O. | Fire retardant composition |
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