CN112341689B - Thermal-aging-resistant polyethylene composite material - Google Patents
Thermal-aging-resistant polyethylene composite material Download PDFInfo
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- CN112341689B CN112341689B CN202011247478.6A CN202011247478A CN112341689B CN 112341689 B CN112341689 B CN 112341689B CN 202011247478 A CN202011247478 A CN 202011247478A CN 112341689 B CN112341689 B CN 112341689B
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 92
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 92
- 239000002131 composite material Substances 0.000 title claims abstract description 91
- -1 polyethylene Polymers 0.000 title claims abstract description 91
- 238000003878 thermal aging Methods 0.000 title claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 41
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 25
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [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 claims abstract description 25
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 25
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 25
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 17
- 238000004132 cross linking Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 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 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
- 238000003825 pressing Methods 0.000 claims description 6
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 5
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 5
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 4
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-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
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 claims description 2
- YEECOJZAMZEUBB-UHFFFAOYSA-N 2,2,3,3,6,6,7,7-octamethyloctane Chemical compound CC(C)(C)C(C)(C)CCC(C)(C)C(C)(C)C YEECOJZAMZEUBB-UHFFFAOYSA-N 0.000 claims description 2
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical compound CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- DEKVAWHRMRNKMI-UHFFFAOYSA-N 1,2-bis(tert-butylperoxy)-3-propan-2-ylbenzene Chemical compound CC(C)C1=CC=CC(OOC(C)(C)C)=C1OOC(C)(C)C DEKVAWHRMRNKMI-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 4
- 239000011229 interlayer Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000005303 weighing Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- AXWJKQDGIVWVEW-UHFFFAOYSA-N 2-(dimethylamino)butanedioic acid Chemical compound CN(C)C(C(O)=O)CC(O)=O AXWJKQDGIVWVEW-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 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
- C08L23/06—Polyethene
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention provides a thermal aging resistant polyethylene composite material, which comprises the following components: polyethylene, a cross-linking agent, an antioxidant, polyethylene wax, light calcium carbonate and hydrotalcite; after the polyethylene wax is melted, a layer of wax film is formed on the surface of the material, so that the protection effect is achieved; the light calcium carbonate can fill small gaps among molecular chains; the hydrotalcite can introduce some functional object substances into interlayer gaps to support the distance of the laminates, fill the gaps among polyethylene molecular chains and enable the molecular chains to be more compact; the polyethylene composite material has excellent insulating property and long service life, is used for insulating 10-35 kV medium-voltage cables, can meet the requirement of the medium-voltage cables on the insulating property, and has the advantages of reasonable proportion of the components, cheap and easily-obtained raw materials and low production cost.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of composite materials, in particular to a thermal aging resistant polyethylene composite material.
[ background of the invention ]
The polyethylene is a thermoplastic resin prepared by polymerizing ethylene, has the performances of softening by heating and hardening by cooling, does not have chemical reaction and has high plasticity; in the insulation of cables, polyethylene is widely applied, but the long-term working temperature of the polyethylene cable is not more than 70 ℃, and the polyethylene is easy to soften or even melt under the high-temperature condition, so that the application range of the polyethylene cable is greatly limited, the cost is required to be increased in some fields with higher working temperature, and other high-temperature-resistant cables are used.
[ summary of the invention ]
Aiming at the defects in the prior art, the invention aims to provide a polyethylene composite material with strong thermal aging resistance, which has good insulating property and long service life and is suitable for insulating 10 kV-35 kV medium-voltage cables.
The invention adopts the following technical scheme: a polyethylene composite material with thermal aging resistance comprises the following raw materials in percentage by weight: 78.7 to 86.7 percent of polyethylene, 2.0 percent of cross linker, 0.3 percent of antioxidant, 3.0 to 8.0 percent of polyethylene wax, 5.0 to 8.0 percent of light calcium carbonate and 3.0 to 5.0 percent of hydrotalcite.
Preferably, the polyethylene composite material comprises the following components in percentage by weight: 81.7 percent of polyethylene, 2.0 percent of cross-linking agent, 0.3 percent of antioxidant, 8.0 percent of polyethylene wax, 5.0 percent of light calcium carbonate and 3.0 percent of hydrotalcite.
The polyethylene wax forms a layer of wax film on the surface of the material after being melted, has stable chemical property and can play a role in protection.
The light calcium carbonate has smaller particle radius, can fill small gaps among molecular chains, has stronger heat resistance and more stable chemical properties, and can improve the insulating property of the polyethylene composite material, but the breakdown field intensity is reduced due to excessive addition of the light calcium carbonate.
Hydrotalcite belongs to an anionic layered compound, and introduces some functional object substances into interlayer gaps and supports the distance of the laminates by utilizing the intercalation property and the interchangeability of interlayer ions of a layered compound main body under the action of strong polar molecules, so that the gaps among polyethylene molecular chains are filled, and the molecular chains are more compact; magnesium aluminum hydrotalcite is preferred in the present application.
Preferably, the crosslinking agent is selected from one of bis (tert-butylperoxyisopropyl) benzene (BIPB), dicumyl peroxide (DCP), benzoyl Peroxide (BPO), di-tert-butyl peroxide (DTBP), dicumyl peroxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide and vinyl triethoxysilane (A151).
Preferably, the antioxidant is selected from one of an antioxidant 1010, an antioxidant 264, an antioxidant 1076, an antioxidant 2246, an antioxidant 300 and an antioxidant 330.
The invention also provides a preparation method of the polyethylene composite material, which comprises the following steps:
(1) Plasticizing and melting polyethylene on an open mill, then sequentially adding an antioxidant, polyethylene wax, light calcium carbonate and hydrotalcite, fully mixing, adding a cross-linking agent, uniformly mixing, and taking out a composite material base material for later use;
(2) Standing the composite material base material prepared in the step (1) for 24 hours at room temperature, and eliminating test result deviation caused by different environmental conditions experienced by a sample before a test;
(3) Tabletting and molding the composite material base material prepared in the step (2) by using a flat vulcanizing machine to prepare a flaky composite material base material;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3);
(5) And (3) standing the composite material prepared in the step (4) at room temperature for 24 hours to obtain the polyethylene composite material.
Preferably, the temperature of the open mill set in step (1) is from 100 to 120 ℃, preferably 110 ℃.
Preferably, the antioxidant, the polyethylene wax, the light calcium carbonate and the hydrotalcite are sequentially added in the step (1), specifically, the components are sequentially added in a molten state, and the latter component is added after the former component is uniformly mixed; prevent the components from mixing unevenly, reduce the mixing time and prevent the crosslinking agent from decomposing in advance.
Preferably, the tabletting and forming in the step (3) is to tablet and form the composite material base material for 4.5 to 5.5min by a flat vulcanizing machine under the conditions of 115 to 125 ℃ and 9 to 11 MPa.
Preferably, the temperature of the thermal crosslinking in the step (4) is 145-155 ℃, and the linear structure is changed into a compact network structure by keeping for 14-16 min.
The invention also aims to provide the application of the thermal aging resistant polyethylene composite material in the insulation of 10-35 kV medium-voltage cables.
Compared with the prior art, the invention has the following beneficial effects:
the polyethylene composite material is based on polyethylene, a certain amount of polyethylene wax, light calcium carbonate, hydrotalcite, a cross-linking agent and an antioxidant are added into the polyethylene composite material, and the thermal stability of the polyethylene composite material is improved by utilizing the interaction of the components, so that the polyethylene composite material can work in an environment at the temperature higher than 100 ℃ for a long time, and the application field is widened;
the polyethylene composite material has the advantages of reasonable component proportion, cheap and easily-obtained raw materials, low production cost, excellent insulating property and long service life;
the polyethylene composite material is suitable for insulation of 10-35 kV medium-voltage cables, and can meet the requirement of the medium-voltage cables on the insulation performance.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described with the following embodiments, but is by no means limited thereto; the following is a description of the preferred embodiments of the present invention, and should not be taken as limiting the invention, but rather as embodying the invention in its broadest form and as indicating any variations, equivalents and modifications within the spirit and scope of the present invention.
Example 1
| Components | Mass ratio/%) |
| Polyethylene | 81.7 |
| Crosslinking agent | 2.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 8.0 |
| Light calcium carbonate | 5.0 |
| Hydrotalcite | 3.0 |
(1) Weighing the components according to the above table, setting the temperature of an open mill to be 110 ℃, placing polyethylene on the open mill for plasticizing and melting, then sequentially adding an antioxidant 1010, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), fully mixing, adding a crosslinking agent BIPB, and fully mixing to obtain a composite material base material;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material by a flat vulcanizing machine at 120 ℃ and 10MPa for 5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 150 ℃, and keeping the temperature for 15min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Example 2
| Components | Mass ratio/%) |
| Polyethylene (PE) | 86.7 |
| Crosslinking agent | 2.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 3.0 |
| Light calcium carbonate | 5.0 |
| Hydrotalcite | 3.0 |
(1) Weighing the components according to the table above respectively, setting the temperature of an open mill at 120 ℃, placing polyethylene on the open mill for plasticizing and melting, then sequentially adding antioxidant 264, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), fully mixing, then adding crosslinking agent DCP, and fully mixing to obtain a composite material base material;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material into sheets by a flat vulcanizing machine at the temperature of 120 ℃ and under the pressure of 10MPa for 5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 150 ℃, and keeping the temperature for 15min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Example 3
| Components | Mass ratio/%) |
| Polyethylene | 84.7 |
| Crosslinking agent | 2.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 3.0 |
| Light calcium carbonate | 5.0 |
| Hydrotalcite | 5.0 |
(1) Respectively weighing the components according to the above table, setting the temperature of an open mill at 100 ℃, placing polyethylene on the open mill for plasticizing and melting, then sequentially adding an antioxidant 1076, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), adding a cross-linking agent BPO after full mixing, and preparing a composite base material after full mixing;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Tabletting the composite material base material by a flat vulcanizing machine at 115 ℃ and 11MPa for 5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 155 ℃, and keeping the temperature for 15min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Example 4
| Components | Mass ratio/%) |
| Polyethylene (PE) | 78.7 |
| Crosslinking agent | 2.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 8.0 |
| Light calcium carbonate | 8.0 |
| Hydrotalcite | 3.0 |
(1) Weighing the components according to the table above, placing polyethylene on an open mill for plasticizing and melting, sequentially adding an antioxidant 1010, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), fully mixing, adding a crosslinking agent BIPB, and fully mixing to obtain a composite material base material;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material into sheets by a flat vulcanizing machine at 125 ℃ and under 10MPa for 4.5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 145 ℃, and keeping the temperature for 16min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Comparative example 1
| Components | Mass ratio/%) |
| Polyethylene | 86.7 |
| Crosslinking agent | 0.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 3.0 |
| Light calcium carbonate | 5.0 |
| Hydrotalcite | 5.0 |
(1) Weighing the components according to the table above, setting the temperature of an open mill to be 110 ℃, placing polyethylene on the open mill for plasticizing and melting, then sequentially adding an antioxidant 1010, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), fully mixing, then adding a crosslinking agent BIPB, and fully mixing to obtain a composite material base material;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material by a flat vulcanizing machine at 120 ℃ and 10MPa for 5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 150 ℃, and keeping the temperature for 15min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Comparative example 2
| Components | Mass ratio/%) |
| Polyethylene | 99.7 |
| Crosslinking agent | 0.0 |
| Antioxidant agent | 0.3 |
| Polyethylene wax | 0.0 |
| Light calcium carbonate | 0.0 |
| Hydrotalcite | 0.0 |
(1) Weighing the components according to the table above, setting the temperature of an open mill to be 110 ℃, placing polyethylene on the open mill for plasticizing and melting, then sequentially adding an antioxidant 1010, polyethylene wax, light calcium carbonate and hydrotalcite (adding the latter component after the former component is uniformly mixed), fully mixing, then adding a crosslinking agent BIPB, and fully mixing to obtain a composite material base material;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material into sheets by a flat vulcanizing machine at the temperature of 120 ℃ and under the pressure of 10MPa for 5min;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3), controlling the heating and crosslinking temperature to be 150 ℃, and keeping the temperature for 15min; so that the linear structure of the composite material becomes a net structure;
(5) And (4) standing the composite material prepared in the step (4) at room temperature for 24 hours.
Carrying out heat aging on the polyethylene composite materials prepared in the above examples 1-4 and comparative examples 1-2 by using a heat aging oven according to the standard GBT 7141-2008, wherein the heat aging condition is 135 ℃ and 168 hours; the electrical properties were then tested according to the GB/T1040-1992 test results as shown in the following table (in which the positive sign of the rate of change is an increase and the negative sign is a decrease):
TABLE 1 comparison table of electrical properties before and after aging
The criteria for evaluating the composites for heat aging resistance were: the performance of the material is basically unchanged or improved after heat aging, namely the loss tangent value and the relative dielectric constant are reduced (the change rate is negative), and the volume resistivity and the breakdown field strength are increased (the change rate is positive); however, in reality, it is impossible to improve all the above four parameters by modifying the composite material, unless the material itself is changed, as can be seen from the data in table 1, the insulation performance of the polyethylene composite materials described in examples 1 to 4 is improved after aging for 168 hours at 135 ℃, especially, the polyethylene composite materials described in example 1 are the most preferable composition, the loss tangent and the relative dielectric constant of the polyethylene composite materials are not greatly changed, the polyethylene composite materials belong to nonpolar dielectrics, the breakdown field strength is obviously improved, although the volume resistivity of the polyethylene composite materials is reduced, the improvement of 9.55% after the breakdown field strength aging of the polyethylene composite materials is a great breakthrough for medium-voltage cables of 10 to 35kV, and the influence of the volume resistivity is negligible under the condition that the breakdown field strength is improved.
The polyethylene composite materials prepared in comparative examples 1 and 2 have a large change rate, and the insulation properties are reduced, and the thermal aging resistance is poor.
In conclusion, the polyethylene composite material disclosed by the application takes polyethylene as a main material, and after a certain amount of polyethylene wax, light calcium carbonate, hydrotalcite, a cross-linking agent and an antioxidant are added for modification, the insulation performance is improved, the service life is greatly prolonged, and the requirement of 10-35 kV medium-voltage cable insulation is met.
Claims (8)
1. The polyethylene composite material with the thermal aging resistance is characterized by comprising the following raw materials in percentage by weight: 78.7 to 86.7 percent of polyethylene, 2.0 percent of cross-linking agent, 0.3 percent of antioxidant, 3.0 to 8.0 percent of polyethylene wax, 5.0 to 8.0 percent of light calcium carbonate and 3.0 to 5.0 percent of hydrotalcite; the polyethylene composite material is prepared by the following method:
(1) Plasticizing and melting polyethylene on an open mill, then sequentially adding an antioxidant, polyethylene wax, light calcium carbonate and hydrotalcite, mixing fully, and then adding a cross-linking agent to obtain a composite material base material for later use;
(2) Standing the composite material base material prepared in the step (1) at room temperature for 24 hours;
(3) Pressing the composite material base material obtained in the step (2) into sheets by using a flat vulcanizing machine to obtain a sheet-shaped composite material base material;
(4) Heating and crosslinking the flaky composite material base material prepared in the step (3) to change the linear structure into a compact reticular structure;
(5) And (4) standing the composite material heated and crosslinked in the step (4) at room temperature for 24 hours to obtain the polyethylene composite material.
2. The thermal aging resistant polyethylene composite material according to claim 1, wherein the polyethylene composite material comprises the following components in percentage by weight: 81.7 percent of polyethylene, 2.0 percent of cross-linking agent, 0.3 percent of antioxidant, 8.0 percent of polyethylene wax, 5.0 percent of light calcium carbonate and 3.0 percent of hydrotalcite.
3. The polyethylene composite material with heat aging resistance according to claim 1, characterized in that the crosslinking agent is selected from one of bis-tert-butylperoxyisopropyl benzene (BIPB), dicumyl peroxide (DCP), benzoyl Peroxide (BPO), di-tert-butyl peroxide (DTBP), dicumyl hydroperoxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, vinyltriethoxysilane (A151).
4. The heat aging resistant polyethylene composite material according to claim 1, wherein the antioxidant is one selected from the group consisting of antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, antioxidant 300, and antioxidant 330.
5. The polyethylene composite material resistant to thermal aging according to claim 1, wherein the temperature of the open mill in step (1) is set to 100 to 120 ℃.
6. The polyethylene composite material with heat aging resistance as claimed in claim 1, wherein the tabletting molding in step (3) is carried out by placing the composite material base material in a press vulcanizer at 115-125 ℃ and 9-11 MPa for 4.5-5.5 min.
7. The heat aging resistant polyethylene composite material according to claim 1, wherein the temperature of the thermal crosslinking in the step (4) is controlled to 145 to 155 ℃ for 14 to 16min.
8. Use of the thermal ageing resistant polyethylene composite material according to claim 1 for insulation of 10-35 kV medium voltage cables.
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| CN1903925A (en) * | 2006-08-07 | 2007-01-31 | 上海新上化高分子材料有限公司 | Crosslinking polyethylene insulating plastic for electric power cable |
| CN106279920A (en) * | 2016-08-30 | 2017-01-04 | 安徽滁州德威新材料有限公司 | A kind of crosslinkable polyethylene Insulation Material of the low by-product of 220kV and preparation method thereof |
| CN106633301A (en) * | 2016-12-19 | 2017-05-10 | 上海至正道化高分子材料股份有限公司 | Middle-high-voltage chemical cross linking cable material for nuclear power station and preparation method and cable thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903925A (en) * | 2006-08-07 | 2007-01-31 | 上海新上化高分子材料有限公司 | Crosslinking polyethylene insulating plastic for electric power cable |
| CN106279920A (en) * | 2016-08-30 | 2017-01-04 | 安徽滁州德威新材料有限公司 | A kind of crosslinkable polyethylene Insulation Material of the low by-product of 220kV and preparation method thereof |
| CN106633301A (en) * | 2016-12-19 | 2017-05-10 | 上海至正道化高分子材料股份有限公司 | Middle-high-voltage chemical cross linking cable material for nuclear power station and preparation method and cable thereof |
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