CN115322471B - High-heat-conductivity cooling pipe material for liquid-cooled cable and preparation method thereof - Google Patents
High-heat-conductivity cooling pipe material for liquid-cooled cable and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 238000001816 cooling Methods 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims abstract description 35
- -1 polyethylene Polymers 0.000 claims abstract description 35
- 229920000573 polyethylene Polymers 0.000 claims abstract description 35
- 229920001577 copolymer Polymers 0.000 claims abstract description 30
- 239000000110 cooling liquid Substances 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 17
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 17
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 15
- 239000004711 α-olefin Substances 0.000 claims abstract description 15
- XEKOWRVHYACXOJ-UHFFFAOYSA-N ethyl acetate Substances CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 239000000314 lubricant Substances 0.000 claims abstract description 13
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- 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 claims description 6
- 229920001903 high density polyethylene Polymers 0.000 claims description 6
- 239000004700 high-density polyethylene Substances 0.000 claims description 6
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- HCILJBJJZALOAL-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)-n'-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 HCILJBJJZALOAL-UHFFFAOYSA-N 0.000 claims description 3
- 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 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N ethyl ethylene Natural products CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 7
- 239000002904 solvent Substances 0.000 abstract description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 239000002861 polymer material Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 2
- 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 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002048 multi walled nanotube Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002109 single walled nanotube Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- 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
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The application relates to a high-heat-conductivity cooling pipe material for a liquid-cooled cable and a preparation method thereof, wherein the material comprises the following components in parts by weight: 30-70 parts of a lubricant; ethylene-alpha-olefin copolymer: 5-20 parts; ethylene-ethyl acetate copolymer: 3-10 parts; polyethylene compatilizer: 3-10 parts; and (3) a heat conducting filler: 60-120 parts; and (3) a lubricant: 1-2 parts; an antioxidant: 0.6-2.5 parts; crosslinking agent: 1.5-3.5 parts; the high heat conduction cooling pipe material for the cold cable uses polyethylene as a base material, ethylene-alpha-olefin copolymer and ethylene-ethyl acetate copolymer are added to increase the tensile strength and elongation at break performance of the base material, aluminum oxide/carbon nano tube composite material is used as a heat conduction filler, and specific parts of corresponding materials are mixed, so that the obtained material has excellent heat conduction performance, excellent temperature resistant range, short-term heat aging resistance, short-term and long-term cooling liquid solvent resistance, and the cooling pipe material can meet the performance requirements of the liquid cooling cable, so that the cable can be used under the conditions of long-term bending, moving and the like.
Description
Technical Field
The application relates to a high-heat-conductivity cooling pipe material for a liquid-cooled cable and a preparation method thereof, and belongs to the technical field of high polymer materials.
Background
In recent years, with rapid development of new energy electric vehicles, more stringent requirements are put on high transmission capacity density, light weight, small volume, low heating temperature, high reliability, high safety and the like of cables for power transmission and distribution on charging key equipment. The liquid cooling charging pile cable is cooled by circulating cooling liquid, so that the cable can be ensured to be continuously used at a lower temperature under the condition of large current flowing through a small section. The liquid cooling charging pile cable is not only beneficial to protecting sensitive electronic components around the liquid cooling cable, but also greatly improves the current carrying capacity of the cable, reduces the section and weight of the cable, omits huge lifting and pressing equipment, reduces the equipment space and the use and maintenance cost, and provides a new solution for realizing miniaturized high-power transmission.
The existing liquid cooling charging pile cable has low cooling efficiency, the cooling liquid circulates in the cooling pipe of the cable for a week, the temperature rise is very limited, namely, the cooling liquid takes away the heat from the whole cable, so that the temperature of the whole cable is very high, the whole cable cannot continuously work under the condition of high current, the main reason is that the heat conductivity coefficient of the polymer material of the cooling pipe suitable for the charging pile cable is very low, the heat conductivity coefficient of the conventional polymer material is only 0.2-0.5 w/(m.k), and the heat generated by heating of the cable cannot quickly and effectively pass through the cooling pipe material to enter the cooling liquid. Although the heat conduction coefficient of the heat conduction silicon rubber material is slightly high, the hardness of the heat conduction silicon rubber material is too soft, and the cooling pipe is easy to collapse when the cable is bent, so that cooling liquid is blocked; and other properties of the improved high polymer material with increased heat conduction performance, such as bursting pressure, mechanical strength, aging performance, cooling liquid resistance and the like, are difficult to meet the requirements. Therefore, the research and development of the high-heat-conductivity cooling tube material for the liquid-cooled charging pile cable is urgent, the heat transmission efficiency of the cable can be improved, and the performance of the cooling tube material in other aspects can not be affected.
Disclosure of Invention
The application aims to provide a high-heat-conductivity cooling pipe material for a liquid cooling cable, which has excellent heat conduction performance, temperature resistance range, short-term heat aging resistance and short-term and long-term cooling liquid solvent resistance.
In order to achieve the above purpose, the present application provides the following technical solutions: the high-heat-conductivity cooling pipe material for the liquid-cooled cable comprises the following components in parts by weight:
polyethylene: 30-70 parts of a lubricant;
ethylene-alpha-olefin copolymer: 5-20 parts;
ethylene-ethyl acetate copolymer: 3-10 parts;
polyethylene compatilizer: 3-10 parts;
and (3) a heat conducting filler: 60-120 parts;
and (3) a lubricant: 1-2 parts;
an antioxidant: 0.6-2.5 parts;
crosslinking agent: 1.5-3.5 parts;
wherein the heat conducting material is an alumina/carbon nano tube composite material.
Further, the heat conductivity coefficient of the high heat conductivity cooling pipe material for the liquid cooling cable is 1.0-1.2 w/(m.k); the temperature resistance range is-40 ℃ to 150 ℃; heating at 175 deg.c for 168 hr to obtain tensile strength and elongation at break in the rate of less than or equal to + -30%; immersing in cooling liquid and heating at 120deg.C for 168h, with tensile strength and elongation at break change rate of less than or equal to + -25%; immersing in cooling liquid and heating at 120deg.C for 1000 hr, the change rate of tensile strength and elongation at break is less than or equal to + -40%;
further, the specific composition of the alumina/carbon nano tube composite material is 3 parts of alumina and 7 parts of carbon nano tube in parts by weight.
Further, the polyethylene is a single linear low density polyethylene having a melt flow rate of 1.0 to 10.0g/min, or a mixture of two or more linear low density polyethylenes having different melt flow rates in an arbitrary weight ratio, having a melt flow rate of 1.0 to 10.0 g/min.
Further, the ethylene-alpha-olefin copolymer is one or more of ethylene-alpha-propylene copolymer, ethylene-alpha-butene copolymer, ethylene-alpha-hexene copolymer, ethylene-alpha-octene copolymer, and the mixture is mixed according to any weight ratio.
Further, the lubricant is polyethylene wax, ethylene bis stearamide, stearic acid or paraffin wax.
Further, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 626, antioxidant 300 and antioxidant 1024.
Further, the polyethylene compatilizer is maleic anhydride grafted modified high-density polyethylene.
The application also provides a preparation method of the high-heat-conductivity cooling pipe material for the liquid-cooled cable, which comprises the following steps: adding 30-70 parts of polyethylene, 5-20 parts of ethylene-alpha-olefin copolymer, 3-10 parts of ethylene-ethyl acetate copolymer, 3-10 parts of polyethylene compatilizer, 60-120 parts of heat conducting filler, 1-2 parts of lubricant, 0.6-2.5 parts of antioxidant and 1.5-3.5 parts of cross-linking agent into a high-speed mixer, fully stirring, and then melting, extruding, drawing and granulating by a double-screw extruder to obtain the product.
The application has the beneficial effects that: the high-heat-conductivity cooling pipe material for the cold cable uses polyethylene as a base material, ethylene-alpha-olefin copolymer and ethylene-ethyl acetate copolymer are added to increase the tensile strength and breaking elongation performance of the base material, polyethylene compatilizer is added to increase the compatibility of the material, aluminum oxide/carbon nano-tube composite material is used as a heat-conducting filler, and specific parts of the corresponding materials are mixed, so that the obtained material has excellent heat-conducting performance, the heat-conducting coefficient is 1.0-1.2 w/(m.k), and the heat-conducting coefficient is improved by 2-3 times compared with that of the conventional high-polymer material, and the heat-generating efficiency of the cooling liquid absorption cable can be effectively improved; the alloy has an excellent temperature resistant range, the low temperature resistance is minus 40 ℃, and the high temperature resistance can reach 150 ℃; the material has short-term heat aging resistance, namely the material lasts for 168 hours at the temperature of 175 ℃ in an oven, and the change rate of the tensile strength and the elongation at break is less than or equal to +/-30 percent; has short-term coolant solvent resistance: immersing the material into cooling liquid and continuously heating the material at the temperature of 120 ℃ for 168 hours, wherein the change rate of the tensile strength and the elongation at break is less than or equal to +/-25%; has long-term coolant solvent resistance: immersing the material into cooling liquid and continuing for 1000 hours at the temperature of 120 ℃ of an oven, wherein the change rate of the tensile strength and the elongation at break is less than or equal to +/-40%; and the cooling tube made of this material can withstand 3 times the claimed maximum working pressure (5 bar) at normal temperature and the tightness needs to be kept intact; the cooling tube made of this material needs to withstand 1.5 times the claimed maximum operating pressure (5 bar) at high temperatures of 90 ℃ and the tightness needs to remain intact; the cooling pipe material can meet the performance requirements of the liquid cooling cable, so that the cable can be used under the conditions of long-term bending, moving and the like.
The foregoing description is only an overview of the present application, and is intended to provide a more thorough understanding of the present application, and is to be accorded the full scope of the present application.
Detailed Description
The following description of the present application will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
The high-heat-conductivity cooling pipe material for the liquid-cooled cable comprises the following components in parts by weight:
polyethylene: 30-70 parts of a lubricant;
ethylene-alpha-olefin copolymer: 5-20 parts;
ethylene-ethyl acetate copolymer: 3-10 parts;
polyethylene compatilizer: 3-10 parts;
and (3) a heat conducting filler: 60-120 parts;
and (3) a lubricant: 1-2 parts;
an antioxidant: 0.6-2.5 parts;
crosslinking agent: 1.5-3.5 parts;
wherein the heat conducting material is an alumina/carbon nano tube composite material. The specific composition of the alumina/carbon nano tube composite material is 3 parts of alumina and 7 parts of carbon nano tube by weight.
The preparation process of the alumina/carbon nano tube composite material mainly comprises the following key steps: 1. surface treatment: firstly, adding the heat-conducting filler and the surface modification auxiliary agent into a high-speed mixer according to a proportion, mixing and post-treating according to a set temperature and time to obtain the heat-conducting filler after surface modification, wherein the aim of surface modification is to generally improve the compatibility of the heat-conducting filler and a polyethylene base material, and the heat-conducting filler has great help to improve the performance of a finished product; 2. pre-dispersing: mixing the surface modified heat conducting filler with part of base materials according to a proportion, extruding and granulating to obtain heat conducting filler master batches, wherein the aim of pre-dispersing is also to improve the uniformity of filler dispersion in a finished product and improve the performance of the finished product. The choice of surface-modifying auxiliary is not particularly limited here.
The carbon nanotubes may be single-walled carbon nanotubes or multi-walled carbon nanotubes, and are not particularly limited herein.
The aluminum oxide/carbon nano tube composite material can effectively improve the heat conduction effect of aluminum oxide, further reduce the use amount of aluminum oxide, maintain the processing performance and mechanical performance of the material on the premise of ensuring the heat conduction performance of the material, and expand the application range of the material.
The polyethylene is a single linear low density polyethylene having a melt flow rate of 1.0 to 10.0g/min, or a mixture of two or more linear low density polyethylenes having different melt flow rates in an arbitrary weight ratio in a melt flow rate range of 1.0 to 10.0 g/min.
The ethylene-alpha-olefin copolymer is one or more of ethylene-alpha-propylene copolymer, ethylene-alpha-butene copolymer, ethylene-alpha-hexene copolymer and ethylene-alpha-octene copolymer, and the ethylene-alpha-olefin copolymer and the ethylene-alpha-butene copolymer are mixed according to any weight ratio.
The addition of ethylene-alpha-olefin copolymer and ethylene-ethyl acetate copolymer to polyethylene increases the tensile strength and elongation at break properties of the substrate.
The lubricant is polyethylene wax, ethylene bis stearamide, stearic acid or paraffin wax.
The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 626, antioxidant 300 and antioxidant 1024.
The polyethylene compatilizer is maleic anhydride grafted modified high-density polyethylene, the model is SZ11, and the polyethylene compatilizer is purchased from Huang Shanbei Notech Co. The polyethylene compatibilizer increases the compatibility properties of the polyethylene, the ethylene-alpha-olefin copolymer, and the ethylene-ethyl acetate copolymer.
The cross-linking agent may be TAIC or TMPTMA or a mixture of TAIC and TMPTMA. The cross-linking agent has the functions of improving the cross-linking efficiency and reducing the irradiation dosage in the irradiation cross-linking process, so that the material is changed into a three-dimensional network structure from a linear structure, and the performances of heat resistance, tensile strength and the like are improved.
The obtained material has excellent heat conduction performance, the heat conduction coefficient is 1.0-1.2 w/(m.k), and the heat conduction coefficient is improved by 2-3 times compared with that of the conventional high polymer material, so that the efficiency of absorbing heat generated by the cable by the cooling liquid can be effectively improved; the alloy has an excellent temperature resistant range, the temperature resistant range is-40 ℃ to 150 ℃, the low temperature resistant range is minus 40 ℃ and the high temperature resistant range can reach 150 ℃; the material has short-term heat aging resistance, namely the material lasts for 168 hours at the temperature of 175 ℃ in an oven, and the change rate of the tensile strength and the elongation at break is less than or equal to +/-30 percent; has short-term coolant solvent resistance: immersing the material into cooling liquid and continuously heating the material at the temperature of 120 ℃ for 168 hours, wherein the change rate of the tensile strength and the elongation at break is less than or equal to +/-25%; has long-term coolant solvent resistance: immersing the material into cooling liquid and continuing for 1000 hours at the temperature of 120 ℃ of an oven, wherein the change rate of the tensile strength and the elongation at break is less than or equal to +/-40%; and the cooling tube made of this material can withstand 3 times the claimed maximum working pressure (5 bar) at normal temperature and the tightness needs to be kept intact; the cooling tube made of this material needs to withstand 1.5 times the claimed maximum operating pressure (5 bar) at high temperatures of 90 ℃ and the tightness needs to remain intact; the cooling pipe material can meet the performance requirements of the liquid cooling cable, so that the cable can be used under the conditions of long-term bending, moving and the like.
The application also provides a preparation method of the high-heat-conductivity cooling pipe material for the liquid-cooled cable, which comprises the following steps: adding 30-70 parts of polyethylene, 5-20 parts of ethylene-alpha-olefin copolymer, 3-10 parts of ethylene-ethyl acetate copolymer, 3-10 parts of polyethylene compatilizer, 60-120 parts of heat conducting filler, 1-2 parts of lubricant, 0.6-2.5 parts of antioxidant and 1.5-3.5 parts of cross-linking agent into a high-speed mixer, fully stirring, and then melting, extruding, drawing and granulating by a double-screw extruder to obtain the product. The purpose of mixing in a high-speed mixer is mainly to improve the uniformity of the dispersion of the filler in the polyethylene base material, and has a certain effect on improving the performances of the finished product in all aspects.
Wherein, 60-120 parts of heat conducting filler and surface modification auxiliary agent are added into a high-speed mixer according to the proportion to obtain heat conducting filler after surface modification, then the heat conducting filler after surface modification is mixed with part of base materials according to the proportion, extruded and granulated to obtain heat conducting filler master batches, and finally the heat conducting filler master batches, the rest parts of polyethylene and the rest materials are added into the high-speed mixer to be mixed.
The specific time length for stirring in the high-speed mixer is set according to actual needs, so long as the materials are uniformly mixed. The melting, extrusion, drawing and pelletizing operations of twin screw extruders are prior art and are not described in detail herein.
Further description of specific embodiments follows.
Example 1
The high-heat-conductivity cooling pipe material for the liquid-cooled cable comprises the following components in parts by weight:
polyethylene: 60 parts;
ethylene-alpha-propylene copolymer: 10 parts;
ethylene-ethyl acetate copolymer: 6 parts;
maleic anhydride graft modified high density polyethylene: 8 parts;
alumina/carbon nanotube composite: 80 parts;
stearic acid: 1 part;
antioxidant 1010:1.5 parts;
crosslinking agent: 2.5 parts.
The thermal conductivity of the material obtained was 1.1 w/(m.k). The material lasts for 168 hours at the temperature of 175 ℃ in an oven, the tensile strength change rate of the material is-15%, and the elongation at break change rate is-20%.
The material was immersed in a cooling liquid and continued for 168 hours at an oven temperature of 120 c with a tensile strength change of-10% and an elongation at break change of-15%. The material was immersed in a cooling liquid and continued for 1000 hours at an oven temperature of 120 c with a tensile strength change of-30% and an elongation at break change of-30%.
The thermal conductivity coefficient of the material is 1.0-1.2 w/(m.k); the short-term aging resistance change rate is less than or equal to +/-30 percent; the performance change rate of the short-term cooling liquid is less than or equal to +/-25 percent; the performance change rate of the short-term cooling liquid is less than or equal to +/-40 percent.
Comparative example 1
The high-heat-conductivity cooling pipe material for the liquid-cooled cable comprises the following components in parts by weight:
polyethylene: 20 parts;
ethylene-alpha-propylene copolymer: 3 parts;
ethylene-ethyl acetate copolymer: 2 parts;
maleic anhydride graft modified high density polyethylene: 8 parts;
alumina/carbon nanotube composite: 10 parts;
stearic acid: 1 part;
antioxidant 1010:1.5 parts;
crosslinking agent: 2.5 parts.
The thermal conductivity of the resulting material was 0.8 w/(m.k). The material lasts for 168 hours at the temperature of 175 ℃ in an oven, the tensile strength change rate of the material is-40%, and the elongation at break change rate is-55%.
The material was immersed in a cooling liquid and continued for 168 hours at an oven temperature of 120 c with a tensile strength change of-35% and an elongation at break change of-45%.
The thermal conductivity coefficient of the material does not meet the requirement of 1.0-1.2 w/(m.k); the short-term aging performance change rate is more than less than or equal to +/-30 percent; the performance change rate of the short-term cooling liquid is more than or equal to +/-25 percent.
Comparative example 2
The high-heat-conductivity cooling pipe material for the liquid-cooled cable comprises the following components in parts by weight:
polyethylene: 80 parts;
ethylene-alpha-propylene copolymer: 25 parts;
ethylene-ethyl acetate copolymer: 15 parts;
maleic anhydride graft modified high density polyethylene: 8 parts;
alumina/carbon nanotube composite: 130 parts;
stearic acid: 1 part;
antioxidant 1010:1.5 parts;
crosslinking agent: 2.5 parts.
The thermal conductivity of the resulting material was 1.5 w/(m.k). The material lasts for 168 hours at the temperature of 175 ℃ in an oven, the tensile strength change rate of the material is-60%, and the elongation at break change rate is-60%.
The material was immersed in a cooling liquid and continued for 168 hours at an oven temperature of 120 c with a tensile strength change of-45% and an elongation at break change of-55%.
The thermal conductivity coefficient of the material does not meet the requirement of 1.0-1.2 w/(m.k); the short-term aging performance change rate is more than less than or equal to +/-30 percent; the performance change rate of the short-term cooling liquid is more than or equal to +/-25 percent.
It is apparent from examples 1 and comparative examples 1 and 2 that the weight ratio of the components greatly affects the properties of the final material, and that materials obtained at a proper weight ratio are required to be suitable for preparing a high heat conductive cooling tube for liquid cooled cables.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (9)
1. The high-heat-conductivity cooling pipe material for the liquid-cooled cable is characterized by comprising the following components in parts by weight:
polyethylene: 60 parts;
ethylene-alpha-olefin copolymer: 10 parts;
ethylene-ethyl acetate copolymer: 6 parts;
polyethylene compatilizer: 8 parts;
and (3) a heat conducting filler: 80 parts;
and (3) a lubricant: 1 part;
an antioxidant: 1.5 parts;
crosslinking agent: 2.5 parts;
wherein the heat conducting filler is an alumina/carbon nano tube composite material.
2. The high heat conduction cooling tube material for liquid cooling cables according to claim 1, wherein the high heat conduction cooling tube material for liquid cooling cables has a heat conductivity coefficient of 1.0 to 1.2 w/(m.k); the temperature resistance range is-40 ℃ to 150 ℃; heating at 175 deg.c for 168 hr to obtain tensile strength and elongation at break in the rate of less than or equal to + -30%; immersing in cooling liquid and heating at 120deg.C for 168h, with tensile strength and elongation at break change rate of less than or equal to + -25%; immersing in cooling liquid and heating at 120 deg.C for 1000 hr, and the change rate of tensile strength and elongation at break is less than or equal to + -40%.
3. The high heat conduction cooling tube material for liquid cooling cables according to claim 1, wherein the specific composition of the alumina/carbon nano tube composite material is 3 parts of alumina and 7 parts of carbon nano tubes in parts by weight.
4. The high heat conductive cooling tube material for liquid cooled cables according to claim 1, wherein the polyethylene is a single linear low density polyethylene having a melt flow rate of 1.0 to 10.0g/min, or a mixture of two or more linear low density polyethylenes having different melt flow rates in an arbitrary weight ratio in a melt flow rate range of 1.0 to 10.0 g/min.
5. The high heat conductive cooling pipe material for liquid cooled cables according to claim 1, wherein the ethylene- α -olefin copolymer is a mixture of one or more of ethylene- α -propylene copolymer, ethylene- α -butene copolymer, ethylene- α -hexene copolymer, and ethylene- α -octene copolymer, which are mixed in any weight ratio.
6. The high heat conductive cooling tube material for liquid cooled cables according to claim 1, wherein the lubricant is polyethylene wax, ethylene bis stearamide, stearic acid or paraffin wax.
7. The high thermal conductivity cooling tube material for liquid cooled cables according to claim 1, wherein the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 626, antioxidant 300, and antioxidant 1024.
8. The high thermal conductivity cooling tube material for liquid cooled cables according to claim 1, wherein said polyethylene compatibiliser is maleic anhydride graft modified high density polyethylene.
9. The method for producing a high heat conduction cooling tube material for liquid cooled cables according to any one of claims 1 to 8, comprising the steps of: 60 parts of polyethylene, 10 parts of ethylene-alpha-olefin copolymer, 6 parts of ethylene-ethyl acetate copolymer, 8 parts of polyethylene compatilizer, 80 parts of heat conducting filler, 1 part of lubricant, 1.5 parts of antioxidant and 2.5 parts of cross-linking agent are added into a high-speed mixer to be fully stirred, and then melted, extruded, pulled and pelletized by a double-screw extruder to obtain the product.
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