CN113736203A - Cross-linked polyethylene cable insulating material containing high-voltage-resistant performance compounding agent and preparation method thereof - Google Patents
Cross-linked polyethylene cable insulating material containing high-voltage-resistant performance compounding agent and preparation method thereof Download PDFInfo
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- CN113736203A CN113736203A CN202010474311.7A CN202010474311A CN113736203A CN 113736203 A CN113736203 A CN 113736203A CN 202010474311 A CN202010474311 A CN 202010474311A CN 113736203 A CN113736203 A CN 113736203A
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- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 71
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 71
- 239000011810 insulating material Substances 0.000 title claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 19
- 238000013329 compounding Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 103
- 229920001684 low density polyethylene Polymers 0.000 claims description 64
- 239000004702 low-density polyethylene Substances 0.000 claims description 64
- -1 aromatic ketone compound Chemical class 0.000 claims description 54
- 239000013522 chelant Substances 0.000 claims description 54
- 239000003963 antioxidant agent Substances 0.000 claims description 50
- 230000003078 antioxidant effect Effects 0.000 claims description 50
- 238000002156 mixing Methods 0.000 claims description 42
- 238000004132 cross linking Methods 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 239000003431 cross linking reagent Substances 0.000 claims description 23
- 229920003023 plastic Polymers 0.000 claims description 22
- 239000004033 plastic Substances 0.000 claims description 22
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical group C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 21
- 239000000654 additive Substances 0.000 claims description 21
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- IMNBHNRXUAJVQE-UHFFFAOYSA-N (4-benzoyl-3-hydroxyphenyl) 2-methylprop-2-enoate Chemical compound OC1=CC(OC(=O)C(=C)C)=CC=C1C(=O)C1=CC=CC=C1 IMNBHNRXUAJVQE-UHFFFAOYSA-N 0.000 claims description 6
- 238000009757 thermoplastic moulding Methods 0.000 claims description 6
- 239000003999 initiator Substances 0.000 claims description 5
- SFWAHIDOQPMACG-UHFFFAOYSA-N (2-hydroxy-4-prop-1-enoxyphenyl)-phenylmethanone Chemical compound OC1=C(C(=O)C2=CC=CC=C2)C=CC(=C1)OC=CC SFWAHIDOQPMACG-UHFFFAOYSA-N 0.000 claims description 4
- 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 4
- AETKQQBRKSELEL-UHFFFAOYSA-N (2E)-1-(2-hydroxyphenyl)-3-phenylprop-2-en-1-one Natural products OC1=CC=CC=C1C(=O)C=CC1=CC=CC=C1 AETKQQBRKSELEL-UHFFFAOYSA-N 0.000 claims description 3
- AETKQQBRKSELEL-ZHACJKMWSA-N 2'-hydroxychalcone Chemical compound OC1=CC=CC=C1C(=O)\C=C\C1=CC=CC=C1 AETKQQBRKSELEL-ZHACJKMWSA-N 0.000 claims description 3
- 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 3
- KCAOMDCOQNGMPG-UHFFFAOYSA-N 1-(2-hydroxy-3-prop-1-enylphenyl)-3-phenylprop-2-en-1-one Chemical compound CC=CC1=CC=CC(C(=O)C=CC=2C=CC=CC=2)=C1O KCAOMDCOQNGMPG-UHFFFAOYSA-N 0.000 claims description 2
- TUMVUERZMHEXMC-UHFFFAOYSA-N CC=CC(C(O)=C(C=C1C(C2=CC=CC=C2)=O)C(C2=CC=CC=C2)=O)=C1O Chemical compound CC=CC(C(O)=C(C=C1C(C2=CC=CC=C2)=O)C(C2=CC=CC=C2)=O)=C1O TUMVUERZMHEXMC-UHFFFAOYSA-N 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 abstract description 61
- 239000000463 material Substances 0.000 abstract description 40
- 230000015556 catabolic process Effects 0.000 abstract description 35
- 229920000642 polymer Polymers 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 7
- 230000007774 longterm Effects 0.000 abstract description 7
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 abstract description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 3
- 229920002554 vinyl polymer Polymers 0.000 abstract description 3
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 2
- 235000006708 antioxidants Nutrition 0.000 description 29
- 230000000977 initiatory effect Effects 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 12
- 150000003254 radicals Chemical class 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 210000001787 dendrite Anatomy 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 150000008365 aromatic ketones Chemical class 0.000 description 10
- 239000004698 Polyethylene Substances 0.000 description 9
- 229920000573 polyethylene Polymers 0.000 description 9
- 239000004020 conductor Substances 0.000 description 7
- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
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- 125000000217 alkyl group Chemical group 0.000 description 4
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- QFQKJEXAGQXTHR-UHFFFAOYSA-N 1-(4-ethenoxyphenyl)ethanone Chemical compound CC(=O)C1=CC=C(OC=C)C=C1 QFQKJEXAGQXTHR-UHFFFAOYSA-N 0.000 description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 3
- 239000012965 benzophenone Substances 0.000 description 3
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- JRZMSOAHAJSDFK-UHFFFAOYSA-N (2-dodecoxyphenyl)-phenylmethanone Chemical compound CCCCCCCCCCCCOC1=CC=CC=C1C(=O)C1=CC=CC=C1 JRZMSOAHAJSDFK-UHFFFAOYSA-N 0.000 description 1
- LJWQJECMFUGUDV-UHFFFAOYSA-N (4-benzoyl-3-hydroxyphenyl) prop-2-enoate Chemical compound OC1=CC(OC(=O)C=C)=CC=C1C(=O)C1=CC=CC=C1 LJWQJECMFUGUDV-UHFFFAOYSA-N 0.000 description 1
- DQFBYFPFKXHELB-UHFFFAOYSA-N Chalcone Natural products C=1C=CC=CC=1C(=O)C=CC1=CC=CC=C1 DQFBYFPFKXHELB-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
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- 238000001291 vacuum drying Methods 0.000 description 1
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/375—Thiols containing six-membered aromatic rings
-
- 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
- H01B3/307—Other macromolecular compounds
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- 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
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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
- 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
- C08L2312/00—Crosslinking
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Abstract
The invention discloses a crosslinked polyethylene cable insulating material containing a high-voltage-resistant performance compounding agent and a preparation method thereof, belonging to the technical field of electrical materials. The invention solves the problems that the existing voltage stabilizer can not give consideration to the wide temperature range high efficiency and long-term compatibility of the voltage stabilizer when improving the voltage resistance of the crosslinked polyethylene insulating material, and can comprehensively improve the branch resistance and the breakdown performance of the crosslinked polyethylene at different temperatures. The voltage stabilizer used in the invention comprises a six-membered chelating ring structure formed by hydroxyl, carbonyl and benzene ring, and the vinyl grafting reaction ensures the uniform and stable dispersion of the voltage stabilizer, and simultaneously, the larger molecular structure and the electron conjugated surface ensure that the voltage stabilizer forms a uniform and dense electron action space in the polymer, so that the action of electron energy consumed by the chelating ring is fully exerted, and the dendritic resistance and the breakdown strength of the material in the whole use temperature range of the cable insulation layer are obviously improved.
Description
Technical Field
The invention relates to a crosslinked polyethylene cable insulating material containing a high-voltage-resistant performance compounding agent and a preparation method thereof, belonging to the technical field of electrical materials.
Background
The electric resistance of the crosslinked polyethylene mainly comprises three aspects of electric branch resistance, electric aging resistance and breakdown strength. The two most commonly used methods for improving the electrical strength of crosslinked polyethylene insulation are: firstly, improving the purity of the material; secondly, modifying the material. Improving the purity of the insulating layer can greatly reduce the negative effect of impurities in the insulating layer on the electric strength, but the current purification process for manufacturing cable materials and cables has been developed greatly, and the electric strength of the crosslinked polyethylene is limited. Therefore, the working voltage grade and the operation stability of the cable insulation layer are difficult to further improve by relying on the improvement of the purity, and the electric resistance of the crosslinked polyethylene insulation material is greatly improved by relying on a material modification technology.
The voltage stabilizer is an effective and easily-realized method for improving the power resistance of the crosslinked polyethylene insulating material, but the existing voltage stabilizer has poor compatibility with the polymer, small molecules of the voltage stabilizer are easy to migrate and precipitate from macromolecules of the polymer, the modification effect of the voltage stabilizer is finally lost, and even the working life and the power resistance of the cable insulating layer are obviously reduced after the voltage stabilizer migrates and precipitates. In contrast, Jarvid M, et al, in the document "Tailored Side-Chain Architecture for Enhanced Dielectric semiconductor devices" of Cross-Linked Polyethylene [ J ]. Journal of Polymer Part B Polymer Physics, proposed that the compatibility of the Voltage stabilizer with the Polymer insulation material can be Enhanced to some extent by connecting one or more long alkyl Side chains to the core molecular structure of the Voltage stabilizer, however, the effect of the Voltage stabilizer on enhancing the branch resistance of the crosslinked Polyethylene can be weakened to some extent by connecting long alkyl Side chains to the core molecular structure of the Voltage stabilizer. In addition, research results of wurana in article "BPH influences the XLPE electric resistance and related mechanism research" show that the problem of migration precipitation of benzophenone after long alkyl side chains are connected to the benzophenone voltage stabilizer is not fundamentally solved, and once additive molecules migrate out, the additive molecules even have a significant negative influence on the breakdown strength of the polymer insulating material. The compatibility problem of the voltage stabilizer is shown in that the voltage stabilizer is easy to migrate and separate out on one hand, and on the other hand, the voltage stabilizer is added to easily inhibit the crosslinking reaction of the crosslinked polyethylene material and reduce the crosslinking degree of the material, so that the material cannot be put into practical application due to insufficient crosslinking degree.
In addition, when the crosslinked polyethylene insulating material is used as a cable insulating layer, the cable insulating layer not only bears ultrahigh voltage, at the same time, the high temperature generated by the heating of the conductor wire core is borne, the long-term working temperature range of the cable insulation layer is up to 90 ℃, however, the effect of the voltage stabilizer reported in the prior art is very limited, and most of the voltage stabilizers can only improve only one single performance of the electrical dendritic performance or the breakdown strength of the crosslinked polyethylene material at normal temperature, the insulation layer of the extra-high voltage power cable requires that the material not only has long-term stable voltage resistance, but also can reliably resist high voltage when the cable insulation layer works at high temperature, therefore, the voltage resistance of the cable insulation layer material at high temperature, such as branch resistance, breakdown strength, and electrical aging resistance, is required to be effectively improved, otherwise, the extra-high voltage power cable still faces unpredictable risks when working in a high-temperature working state with full current load.
In summary, the prior art for improving the voltage resistance of the crosslinked polyethylene insulating material by using the voltage stabilizer cannot give consideration to the wide temperature range high efficiency of the voltage stabilizer and the long-term compatibility of the voltage stabilizer with the polymer, and particularly, an effective means is lacked in the aspect of comprehensively improving the branch resistance and the breakdown performance of the crosslinked polyethylene at different temperatures. Therefore, it is necessary to provide a crosslinked polyethylene cable insulation material containing a high-voltage resistant compounding agent and a preparation method thereof.
Disclosure of Invention
The invention provides a crosslinked polyethylene cable insulating material containing a high-voltage-resistance compounding agent and a preparation method thereof, aiming at solving the problems that the existing voltage stabilizer cannot give consideration to the wide-temperature-range high efficiency of the voltage stabilizer and the long-term compatibility of the voltage stabilizer with a polymer when the voltage resistance of the crosslinked polyethylene insulating material is improved, and the branch resistance and the breakdown performance of crosslinked polyethylene at different temperatures are comprehensively improved.
The technical scheme of the invention is as follows:
the insulating material comprises, by mass, 100 parts of low-density polyethylene, 0.1-0.5 part of an antioxidant, 0.2-2.5 parts of an initiator and 0.01-1.2 parts of a graftable aromatic ketone compound containing a six-membered chelate ring.
Further, the graftable aromatic ketone compound having a six-membered chelate ring is one or more of 2' -hydroxychalcone, 2' -hydroxy-3 ' -propenylchalcone, 4-propenyloxy-2-hydroxybenzophenone, 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate, 2-hydroxy-4-propenyloxybenzophenone, 2-hydroxy-4- (methacryloyloxy) benzophenone and 2-propenyl-4, 6-bibenzoylresorcinol, which are mixed in an arbitrary ratio.
Further, the antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 300 and antioxidant 1035, which are mixed according to any proportion.
Further defined, the initiator is dicumyl peroxide.
The preparation method of the crosslinked polyethylene cable insulating material containing the high-voltage-resistant performance compounding agent comprises the following steps:
mixing and granulating low-density polyethylene, an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring to obtain plastic particles mixed with an additive;
and step two, performing thermoplastic molding and crosslinking treatment on the plastic particles mixed with the additive in sequence to obtain the high-electric-resistance crosslinked polyethylene insulating material.
Further limiting, the thermoplastic molding in the step two is finished by using a cable insulation extruder or a flat vulcanizing machine, and the thermoplastic molding temperature is 110-120 ℃;
and the crosslinking reaction in the second step is finished by using a cable crosslinking pipeline or a flat vulcanizing machine, and the crosslinking reaction conditions are as follows: the temperature is 145-270 ℃, the time is 5-60 min, and the pressure is 0.7-15 MPa.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: melting and mixing low-density polyethylene particles, an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain plastic particles mixed with additives.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: fully mixing an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring, heating to completely melt, uniformly stirring with low-density polyethylene particles, and soaking at 60-100 ℃ for 2-24 hours until all liquid is absorbed by the low-density polyethylene particles and no liquid remains on the surfaces of the low-density polyethylene particles, thereby obtaining the plastic particles mixed with the additive.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: melting and mixing the low-density polyethylene particles and the antioxidant at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant; and then fully mixing the cross-linking agent and the graftable aromatic ketone compound containing the six-membered chelate ring, heating the mixture until the mixture is completely melted, uniformly stirring the mixture with the antioxidant-mixed low-density polyethylene particles, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: melting and mixing low-density polyethylene particles, an antioxidant and a graftable aromatic ketone compound containing a six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring; and then heating the crosslinking agent to be completely melted, stirring the melted crosslinking agent and low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: heating the graftable aromatic ketone compound containing the six-membered chelate ring to be completely melted, stirring the graftable aromatic ketone compound with low-density polyethylene particles, and soaking the graftable aromatic ketone compound and the low-density polyethylene particles for 2 to 24 hours at the temperature of 60 to 100 ℃ until all liquid is absorbed by the particles; adding an antioxidant, melting and mixing at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with a graftable aromatic ketone compound containing a six-membered chelate ring and the antioxidant; and then heating the cross-linking agent to be completely melted, stirring the cross-linking agent and low-density polyethylene particles mixed with the graftable aromatic ketone compound containing the six-membered chelate ring and the antioxidant, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
Further limiting, the specific operation process of the mixing granulation in the step one is as follows: mixing the six-membered chelate ring-containing graftable aromatic ketone compound and the antioxidant, heating to completely melt the mixture, stirring the mixture with low-density polyethylene particles, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain plastic particles mixed with the antioxidant and the six-membered chelate ring-containing graftable aromatic ketone compound; then melting and mixing the antioxidant and plastic particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring; and then heating the cross-linking agent to be completely melted, stirring the cross-linking agent and low-density polyethylene particles mixed with the graftable aromatic ketone compound containing the six-membered chelate ring and the antioxidant, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
The invention has the following beneficial effects: the stabilizer used for preparing the high-power-resistance crosslinked polyethylene insulating material contains vinyl, carbon-oxygen double bonds and a polyphenyl ring structure, has a larger electron conjugate plane, and increases the probability of collision with high-energy electrons. The method has the following advantages:
(1) the aromatic ketone voltage stabilizer with the carbon-carbon double bond structure can generate free radicals under the decomposition action of dicumyl peroxide, and is bonded on a crosslinked polyethylene macromolecular chain through free radical addition reaction in the crosslinking process of crosslinked polyethylene, so that the problem that the voltage stabilizer molecules are incompatible with a polymer matrix is solved, and the voltage stabilizer has excellent stable uniform dispersibility and excellent long-term migration resistance. And because the free radical addition reaction can not consume the number of free radicals generated by dicumyl peroxide, the voltage stabilizer can not seriously affect the crosslinking degree of polyethylene, namely the voltage stabilizer used by the invention can not affect the crosslinking degree of materials, and simultaneously ensure the dispersibility, the migration resistance and the long-term effectiveness of the voltage stabilizer molecules.
(2) The voltage stabilizer used in the invention comprises a hexahydric chelate ring structure consisting of hydroxyl, carbonyl, benzene ring and intramolecular hydrogen bonds, so that the electron cloud action space range of the voltage stabilizer molecules is further enlarged, and meanwhile, the voltage stabilizer can more quickly and efficiently consume the energy of high-energy electrons through the proton resonance effect on the intramolecular hydrogen bonds in the chelate ring, and the impact damage effect of the high-energy electrons on polymer molecular chains is avoided. The voltage stabilizer molecule has obvious effect, can play a role at normal temperature, can comprehensively and effectively improve the performance of branch resistance, alternating current breakdown strength, direct current breakdown strength and the like of the crosslinked polyethylene at high temperature, is beneficial to forming a larger electronic conjugated structure by the voltage stabilizer molecule and obtaining a stable and compact electron-withdrawing space action range after the molecule is uniformly grafted, and also has the key effect of quickly and efficiently absorbing and consuming high-energy electronic energy by virtue of a proton resonance effect generated by intramolecular hydrogen bonds by a six-membered chelate ring in the voltage stabilizer molecule.
(3) The voltage stabilizer used in the invention ensures the uniform and stable dispersion of the voltage stabilizer due to the grafting reaction on the vinyl, and simultaneously, the larger molecular structure and the larger electronic conjugated surface ensure that the voltage stabilizer forms a uniform and dense electronic action space in the polymer, so that the function of the chelate ring for consuming electronic energy is fully exerted, the function of hydrogen bond consumption high-energy electrons in the chelate ring molecule is not influenced by the grafting reaction, and the proton resonance effect on the hydrogen bond in the chelate ring is non-destructive, therefore, the voltage stabilizer has no consumable property any more, and the action effect of the voltage stabilizer cannot be weakened along with the extension of the working time.
(4) The stabilizing agent used in the invention can fully play the synergistic effect of each group contained in the voltage stabilizing agent molecule, so that the capability of the voltage stabilizing agent in improving the electrical dendritic, electrical aging and breakdown strength of the crosslinked polyethylene insulating material at different working temperatures is enhanced, and the effect of the voltage stabilizing agent is comprehensively improved.
(5) The additives adopted by the crosslinked polyethylene insulating material are all non-nano additives, the melting temperature is low, the uniform mixing can be completed in the existing production process of the cable, the production can be realized by adopting the existing high-voltage cable material, cable production equipment and production process, and the capital investment of the manufacturing equipment of the ultrahigh-voltage cable and the cable material thereof is reduced.
Drawings
Fig. 1 is a reaction schematic diagram of a preparation process of the high-power-resistance crosslinked polyethylene insulation material of the present invention.
Detailed Description
The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.
Example 1:
adding 40g of low-density polyethylene into an internal mixer, melting at 110 ℃, wherein the rotating speed is 50r/min, adding 0.32g of 4-propylene-oxy-2-hydroxybenzophenone after melting, mixing for 5min at the same temperature and rotating speed, adding 0.8g of dicumyl peroxide and 0.12g of antioxidant 1035, continuously mixing for 3min at the same temperature and rotating speed, carrying out melt blending to obtain a blend, putting the blend into a mold, carrying out hot press molding in a flat vulcanizing machine at 110 ℃ and 15MPa, and then carrying out crosslinking for 30min in a flat vulcanizing machine at 175 ℃ and 15MPa to complete the crosslinking reaction of crosslinked polyethylene and the grafting reaction of a compound containing chelate ring aromatic ketone, thereby obtaining the chelate ring aromatic ketone grafted crosslinked polyethylene insulating material. The specific process is shown in figure 1, dicumyl peroxide as an initiator is decomposed at high temperature to generate a primary free radical, the primary free radical and hydrogen atoms in a polyethylene molecular chain generate a polyethylene macromolecular chain free radical, then the macromolecular chain free radical and a graftable aromatic ketone compound 4-propylene oxy-2-hydroxybenzophenone molecule containing a six-membered chelate ring are subjected to a free radical addition reaction on the vinyl group to generate a graft free radical, and finally the graft free radical can be subjected to a chain termination reaction with the primary free radical to generate a chelate ring aromatic ketone grafted crosslinked polyethylene insulating material, and the crosslinking degree of the material is tested by adopting a gel content method according to JB/T10437-.
An alternating current high voltage or a direct current high voltage which linearly increases was applied to the insulating material (film samples of 100 μm) at different temperatures until the samples broke down, and an average alternating current breakdown field strength and an average direct current breakdown field strength were obtained for 10 samples, respectively, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| AC breakdown field strength | 118kV/mm | 114kV/mm | 103kV/mm | 89kV/mm |
| DC breakdown field strength | 440kV/mm | 375kV/mm | 350kV/mm | 250kV/mm |
The pin-plate electrode structure is adopted to carry out the electrical tree initiation voltage test on the material at different temperatures, the pin-plate distance is 3mm, the curvature radius of the pin point is 5 mu m, the voltage boosting mode is linear voltage boosting, the average electrical tree initiation voltage of 10 samples is obtained at each temperature, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| Average electrical branch initiation voltage | 14.3kV | 8.5kV | 5.0kV | 4.5kV |
Example 2:
adding 10kg of low-density polyethylene into a double-cone rotary vacuum dryer, setting the temperature inside the dryer to be 90 ℃, setting the rotating speed to be 50r/min, preheating low-density polyethylene particles for 10min, uniformly stirring 30g of antioxidant 1076, 40g of 4-propylene oxy-2-hydroxybenzophenone and 180g of dicumyl peroxide, heating to 90 ℃ until the three powders are completely melted into a solution, uniformly stirring the solution, spraying the solution into the double-cone rotary vacuum dryer, rotatably heating and soaking for 4h under the vacuum of-0.1 MPa, adding the soaked particles into a parallel double-screw extruder, extruding and granulating at the temperature of 110 ℃, putting the obtained particles into a die, carrying out hot press molding in a flat vulcanizing machine at the temperature of 110 ℃ and the pressure of 15MPa, then carrying out cross-linking in the flat vulcanizing machine at the temperature of 175 ℃ and the pressure of 15MPa for 30min, finishing the cross-linking reaction of the cross-linked polyethylene and the grafting reaction of the chelate ring aromatic ketone compound, obtaining the chelate ring aromatic ketone grafted crosslinked polyethylene insulating material.
Example 3:
adding 100kg of low-density polyethylene into a double-cone rotary vacuum dryer, setting the temperature inside the dryer to be 80 ℃, setting the rotating speed to be 50r/min, preheating low-density polyethylene particles for 10min, uniformly stirring 300g of antioxidant 1035, 200g of 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate, 200g of 2-propenyl-4, 6-dibenzoylresorcinol and 1800g of dicumyl peroxide, heating to 90 ℃ until the three powders are completely melted into a solution, uniformly stirring the solution, spraying the solution into the double-cone rotary vacuum dryer, rotationally heating and soaking for 8h under the vacuum of-0.1 MPa, adding the soaked particles into a single-screw extruder, extruding and granulating at 110 ℃, extruding and covering the obtained particles serving as insulating material particles on a cable conductor core by using a three-layer co-extruder, and preparing an insulating fiber core containing an inner shielding layer and an outer shielding layer, then drawing the insulating fiber core into a high-temperature high-pressure nitrogen crosslinking pipeline for crosslinking, setting the temperature of the pipeline to be 350 ℃ (the actual temperature of the surface of the insulating layer is less than 270 ℃) and setting the air pressure to be 1MPa, and thus obtaining the insulating layer of the high-voltage power cable made of the chelating ring aromatic ketone grafted crosslinking polyethylene insulating material.
Example 4:
melting and blending 100kg of low-density polyethylene and 300g of antioxidant 300 at 120 ℃ by adopting a double-screw extruder, extruding and granulating, adding the prepared low-density polyethylene particles containing the antioxidant 300 into a double-cone rotary vacuum dryer, setting the temperature inside the dryer to be 80 ℃, the rotating speed to be 60r/min, preheating the low-density polyethylene particles for 10min, uniformly stirring 2000g of dicumyl peroxide, 100g of 2' -hydroxy chalcone, 100g of 2' -hydroxy-3 ' -propenyl chalcone and 200g of 2-hydroxy-4- (methacryloyloxy) benzophenone, heating to 90 ℃ until the four powders are completely melted into a solution, spraying the solution into the double-cone rotary vacuum dryer after uniformly stirring, carrying out rotary heating and soaking under the vacuum of-0.1 MPa for 8h, adding the soaked particles into the single-screw extruder, and (2) extruding and granulating at 110 ℃, taking the obtained particles as insulating material particles, extruding the insulating material particles by using a three-layer co-extrusion extruder to cover the particles on the conductor wire core of the cable conductor to prepare an insulating wire core containing an inner shielding layer and an outer shielding layer, then drawing the insulating wire core into a high-temperature high-pressure nitrogen crosslinking pipeline for crosslinking, setting the temperature of the pipeline to be 350 ℃ (the actual temperature of the surface of the insulating layer is less than 270 ℃) and setting the air pressure to be 1MPa, and thus obtaining the insulating layer of the high-voltage power cable made of the chelating ring aromatic ketone grafted crosslinked polyethylene insulating material.
Example 5:
melting and blending 300g of antioxidant 300, 800g of 2-hydroxy-4-acryloyloxy benzophenone and 100kg of low-density polyethylene at 120 ℃ by adopting a double-screw extruder, extruding and granulating, then adding the prepared low-density polyethylene particles into a double-cone rotary vacuum dryer, setting the temperature in the dryer to be 80 ℃, setting the rotating speed to be 60r/min, preheating the low-density polyethylene particles for 10min, heating 2000g of dicumyl peroxide to 90 ℃ until the four powders are completely melted into a solution, spraying the solution into the double-cone rotary vacuum dryer, rotating and heating and soaking for 2h under the vacuum of-0.1 MPa, adding the soaked particles into a single-screw extruder, extruding and granulating at 110 ℃, extruding and covering the obtained particles serving as insulating material particles on a cable conductor wire core by using a three-layer co-extruder to prepare an insulating wire core containing an inner shielding layer and an outer shielding layer, and then, the insulated wire core is pulled to enter a high-temperature high-pressure nitrogen crosslinking pipeline for crosslinking, the temperature of the pipeline is set to be 350 ℃ (the actual temperature of the surface of the insulated layer is less than 270 ℃), and the air pressure is set to be 1MPa, so that the insulated layer of the high-voltage power cable made of the chelate ring aromatic ketone grafted crosslinked polyethylene insulated material can be obtained.
Example 6:
heating 600g of 2-hydroxy-4- (methacryloyloxy) benzophenone to 90 ℃ until the 2-hydroxy-4- (methacryloyloxy) benzophenone is completely melted, adding 100kg of low-density polyethylene into a double-cone rotary vacuum dryer, setting the temperature inside the dryer to be 80 ℃, rotating at the speed of 60r/min, preheating low-density polyethylene particles for 10min, spraying 2-hydroxy-4- (methacryloyloxy) benzophenone liquid onto the low-density polyethylene particles by using a peristaltic pump, rotationally heating and soaking the low-density polyethylene particles for 4h under atmospheric pressure, adding the soaked particles and 300g of antioxidant 1010 into a reciprocating mixing extruder according to a ratio to extrude and granulate, gradually raising the temperature along the length direction from a feed inlet of the mixing extruder to the extruder head and setting the temperature to be within the range of 100-120 ℃, putting the obtained plastic particles into the double-cone rotary vacuum dryer again, setting the temperature inside the dryer to be 80 ℃, the rotating speed is 60r/min, after low-density polyethylene particles are preheated for 10min, 2200g of dicumyl peroxide is heated to 90 ℃ until the dicumyl peroxide is completely melted, a peristaltic pump is adopted to spray the dicumyl peroxide into a double-cone rotary vacuum drying machine, the dicumyl peroxide is rotationally heated and soaked for 2h under atmospheric pressure, the obtained particles are taken as insulating material particles, a three-layer co-extrusion extruder is used for extruding and covering the insulating material particles on cable conductor wire cores to prepare insulating wire cores containing inner and outer shielding layers, then the insulating wire cores are pulled into a high-temperature high-pressure nitrogen crosslinking pipeline for crosslinking, the temperature of the pipeline is set to be 320 ℃ (the actual temperature of the surface of the insulating layer is less than 250 ℃), and the air pressure is set to be 1MPa, so that the high-voltage power cable insulating layer made of the chelate ring aromatic ketone grafted crosslinked polyethylene insulating material can be obtained.
Example 7:
uniformly stirring 300g of 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate and 100g of antioxidant 1076, heating to 90 ℃ until the powder is completely melted into a solution, adding 100kg of low-density polyethylene particles into a double-cone rotary vacuum dryer, setting the temperature inside the dryer to be 80 ℃ and the rotating speed to be 60r/min, preheating the low-density polyethylene particles for 15min, adding an additive solution onto the sprayed low-density polyethylene particles by using a peristaltic pump, rotationally heating and soaking for 12h under atmospheric pressure, adding the soaked particles and 300g of antioxidant 1035 into a single-screw extruder according to a ratio, carrying out melt blending, extruding and granulating, setting the temperature of the extruder head to be 115 ℃, then putting the obtained plastic particles into the double-cone rotary vacuum dryer again, setting the temperature inside the dryer to be 80 ℃, the rotating speed is 60r/min, after low-density polyethylene particles are preheated for 10min, 2200g of dicumyl peroxide is heated to 90 ℃ until the dicumyl peroxide is completely melted, a peristaltic pump is adopted to spray the dicumyl peroxide into a double-cone rotary vacuum drier, the dicumyl peroxide is rotated, heated and soaked for 2h under atmospheric pressure, the obtained particles are taken as insulating material particles, a three-layer co-extrusion extruder is used for extruding and covering the insulating material particles on cable conductor wire cores to prepare insulating wire cores containing inner and outer shielding layers, then the insulating wire cores are pulled into a high-temperature high-pressure nitrogen crosslinking pipeline for crosslinking, the temperature of the pipeline is set to be 360 ℃ (the actual temperature of the surface of the insulating layer is about 270 ℃), and the air pressure is set to be 1MPa, so that the high-voltage power cable insulating layer made of the chelate ring aromatic ketone grafted crosslinked polyethylene insulating material can be obtained.
Comparative example 1: without addition of voltage stabilizers
Adding 40g of low-density polyethylene into an internal mixer, melting at 110 ℃ at the rotating speed of 50r/min, adding 0.8g of dicumyl peroxide and 0.12g of antioxidant 1035 after melting, and mixing for 5min at the same temperature and rotating speed to obtain the low-density polyethylene material containing the antioxidant and the crosslinking agent. After the blend is obtained, putting the blend into a die to be hot-pressed and molded in a flat vulcanizing machine with the temperature of 110 ℃ and the pressure of 15MPa, and then crosslinking the blend in a flat vulcanizing machine with the temperature of 175 ℃ and the pressure of 15MPa for 30min to finish the crosslinking reaction of the crosslinked polyethylene, thus obtaining the crosslinked polyethylene insulating material. The crosslinking degree of the material is tested by adopting a gel content method according to the JB/T10437-2004 standard, and the gel content of the material is measured to be 87.9%.
The cross-linked polyethylene material (100 μm film samples) was subjected to linearly increasing ac or dc high voltages at different temperatures until the samples broke down, and the average ac breakdown field strength and the average dc breakdown field strength of 10 samples were obtained, respectively, and the results are shown in the following table.
The pin-plate electrode structure is adopted to carry out the electrical tree initiation voltage test on the material at different temperatures, the pin-plate distance is 3mm, the curvature radius of the pin point is 5 mu m, the voltage boosting mode is linear voltage boosting, the average electrical tree initiation voltage of 10 samples is obtained at each temperature, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| Average electrical branch initiation voltage | 6.3kV | 5.5kV | 3.6kV | 4.0kV |
Comparative example 2: the voltage stabilizer has no grafting property and does not contain a six-membered chelate ring structure
Adding 40g of low-density polyethylene into an internal mixer, melting at 110 ℃, wherein the rotating speed is 50r/min, adding 0.8g of dicumyl peroxide and 0.16g of dodecyloxy benzophenone after melting, and mixing for 5min at the same temperature and rotating speed to obtain the low-density polyethylene material containing the long-alkyl side chain voltage stabilizer and the cross-linking agent. After the blend is obtained, putting the blend into a die to be hot-pressed and molded in a flat vulcanizing machine with the temperature of 110 ℃ and the pressure of 15MPa, and then crosslinking the blend in a flat vulcanizing machine with the temperature of 175 ℃ and the pressure of 15MPa for 30min to finish the crosslinking reaction of the crosslinked polyethylene, thus obtaining the crosslinked polyethylene insulating material.
This material (100 μm thin film sample) was applied with linearly increasing ac high voltage or dc high voltage at room temperature until the sample broke down, and the average ac breakdown field strength and the average dc breakdown field strength of 10 samples were obtained, respectively, and the results are shown in the following table.
| Test temperature | At room temperature |
| AC breakdown field strength | 109kV/mm |
| DC breakdown field strength | 424kV/mm |
The pin-plate electrode structure is adopted to carry out the electrical tree initiation voltage test on the material at different temperatures, the pin-plate distance is 3mm, the curvature radius of the pin point is 5 mu m, the voltage boosting mode is linear voltage boosting, the average electrical tree initiation voltage of 10 samples is obtained at each temperature, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| Average electrical branch initiation voltage | 6.8kV | 5.5kV | 3.2kV | 2.8kV |
Comparative example 3: the voltage stabilizer does not contain a six-membered chelate ring structure
Adding 40g of low-density polyethylene into an internal mixer, melting at 110 ℃, wherein the rotating speed is 50r/min, adding 0.8g of dicumyl peroxide and 0.16g of p-vinyloxyacetophenone after melting, and mixing for 5min at the same temperature and rotating speed to obtain the low-density polyethylene material containing the p-vinyloxyacetophenone and a cross-linking agent. After the blend is obtained, putting the blend into a die to be hot-pressed and molded in a flat vulcanizing machine with the temperature of 110 ℃ and the pressure of 15MPa, and then crosslinking the blend in a flat vulcanizing machine with the temperature of 175 ℃ and the pressure of 15MPa for 30min to finish the crosslinking reaction of the crosslinked polyethylene, thus obtaining the crosslinked polyethylene insulating material.
The cross-linked polyethylene material 100 μm film samples were subjected to linearly increasing ac high voltage or dc high voltage at different temperatures until the samples broke down, and the average ac breakdown field strength and the average dc breakdown field strength of 10 samples were obtained, respectively, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| AC breakdown field strength | 112kV/mm | 107kV/mm | 95kV/mm | 80kV/mm |
| DC breakdown field strength | 410kV/mm | 330kV/mm | 275kV/mm | 230kV/mm |
The pin-plate electrode structure is adopted to carry out the electrical tree initiation voltage test on the material at different temperatures, the pin-plate distance is 3mm, the curvature radius of the pin point is 5 mu m, the voltage boosting mode is linear voltage boosting, the average electrical tree initiation voltage of 10 samples is obtained at each temperature, and the results are shown in the following table.
| Test temperature | At room temperature | 50℃ | 70℃ | 90℃ |
| Average electrical branch initiation voltage | 7.8kV | 5.8kV | 3.5kV | 3.1kV |
The test results are compared and analyzed, and the results are as follows:
(1) comparing the alternating current breakdown field strength, the direct current breakdown field strength and the electrical dendrite initiation voltage of the two polyethylene insulating materials prepared in the example 1 and the comparative example 1 at different temperatures, it can be seen that the alternating current breakdown strength, the direct current breakdown strength and the electrical dendrite initiation voltage of the material prepared in the example 1 at each temperature are higher than those of the comparative example 1 in the temperature range in which the cable normally works, which is mainly because the comparative example 1 is a conventional crosslinked polyethylene insulating material without a voltage stabilizer, which shows that the voltage stabilizer graft-modified crosslinked polyethylene used in the invention can effectively improve the alternating current breakdown strength and the direct current breakdown strength and improve the resistance of the material to electrical dendrite aging in the temperature range in which the cable insulating layer works.
(2) Comparing the gel contents of the two polyethylene insulation materials prepared in example 1 and comparative example 1, it can be seen that the gel content of the material prepared in example 1 is higher than that of comparative example 1, indicating that the crosslinking reaction process of the voltage stabilizer graft-modified crosslinked polyethylene material used in the present application is not inhibited or affected by the inventive graftable aromatic ketone compound having a six-membered chelate ring.
(3) Comparative example 2 is a cross-linked polyethylene material prepared using benzophenone having a long alkyl side chain as a voltage stabilizer, and the voltage stabilizer used in comparative example 2 has a molecular structure similar to those of the various compounds of the present invention, but does not have graftability and does not have a six-membered chelate ring structure of the present invention. Comparing the alternating current breakdown field strength, the direct current breakdown field strength and the electrical dendrite initiation voltage at different temperatures of the polyethylene insulation materials prepared in the example 1, the comparative example 1 and the comparative example 2 respectively, it can be seen that the material obtained in the example 1 is superior to the comparative example 2, and the polyethylene insulation material obtained in the comparative example 2 can only improve the electrical dendrite initiation voltage at normal temperature, can not only improve the electrical dendrite initiation voltage of crosslinked polyethylene at high temperature, and can even reduce the electrical dendrite initiation voltage of crosslinked polyethylene at high temperature.
(4) Comparative example 3 is a crosslinked polyethylene material prepared using p-vinyloxyacetophenone having a graftable molecular group as a voltage stabilizer, and the voltage stabilizer used in comparative example 3 contains a graftable molecular group, but the voltage stabilizer molecule contains only one benzene ring, and the voltage stabilizer molecule does not contain a six-membered chelate ring structure according to the present invention. Comparing the alternating current breakdown field strength, the direct current breakdown field strength and the electrical dendrite initiation voltage at different temperatures of the polyethylene insulation materials prepared in the example 1, the comparative example 1 and the comparative example 3 respectively, it can be seen that the material obtained in the example 1 is superior to the comparative example 3, the material obtained in the comparative example 3 can only improve the electrical dendrite initiation voltage at normal temperature, can not only improve the electrical dendrite initiation voltage of crosslinked polyethylene at high temperature, and can even reduce the electrical dendrite initiation voltage of crosslinked polyethylene at high temperature.
Claims (12)
1. The crosslinked polyethylene cable insulating material containing the high-power-resistance performance compounding agent is characterized by comprising 100 parts by mass of low-density polyethylene, 0.1-0.5 part by mass of an antioxidant, 0.2-2.5 parts by mass of an initiator and 0.01-1.2 parts by mass of a graftable aromatic ketone compound containing a six-membered chelate ring.
2. The crosslinked polyethylene cable insulation material containing a highly durable performance compounding agent according to claim 1, wherein the graftable aromatic ketone compound having a six-membered chelate ring is one or more selected from the group consisting of 2' -hydroxychalcone, 2' -hydroxy-3 ' propenylchalcone, 4-propenyloxy-2-hydroxybenzophenone, 2- (4-benzoyl-3-hydroxyphenoxy) ethyl 2-acrylate, 2-hydroxy-4-propenyloxybenzophenone, 2-hydroxy-4- (methacryloyloxy) benzophenone and 2-propenyl-4, 6-dibenzoylresorcinol, in any ratio.
3. The crosslinked polyethylene cable insulation material containing high-voltage resistant performance compounding agent as claimed in claim 1, wherein the antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 300 and antioxidant 1035, and is mixed in any proportion.
4. The crosslinked polyethylene cable insulation material containing a high electric resistance compounding agent as claimed in claim 1, wherein said initiator is dicumyl peroxide.
5. The process for preparing a crosslinked polyethylene cable insulation material containing a high-withstand-performance compounding agent according to claim 1, comprising the steps of:
mixing and granulating low-density polyethylene, an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring to obtain plastic particles mixed with an additive;
and step two, performing thermoplastic molding and crosslinking treatment on the plastic particles mixed with the additive in sequence to obtain the high-electric-resistance crosslinked polyethylene insulating material.
6. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent according to claim 5, wherein the thermoplastic molding in the second step is performed by using a cable insulation extruder or a flat vulcanizing machine, and the thermoplastic molding temperature is 110-120 ℃;
and the crosslinking reaction in the second step is finished by using a cable crosslinking pipeline or a flat vulcanizing machine, and the crosslinking reaction conditions are as follows: the temperature is 145-270 ℃, the time is 5-60 min, and the pressure is 0.7-15 MPa.
7. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: melting and mixing low-density polyethylene particles, an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain plastic particles mixed with additives.
8. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: fully mixing an antioxidant, a cross-linking agent and a graftable aromatic ketone compound containing a six-membered chelate ring, heating to completely melt, uniformly stirring with low-density polyethylene particles, and soaking at 60-100 ℃ for 2-24 hours until all liquid is absorbed by the low-density polyethylene particles and no liquid remains on the surfaces of the low-density polyethylene particles, thereby obtaining the plastic particles mixed with the additive.
9. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: melting and mixing the low-density polyethylene particles and the antioxidant at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant; and then fully mixing the cross-linking agent and the graftable aromatic ketone compound containing the six-membered chelate ring, heating the mixture until the mixture is completely melted, uniformly stirring the mixture with the antioxidant-mixed low-density polyethylene particles, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
10. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: melting and mixing low-density polyethylene particles, an antioxidant and a graftable aromatic ketone compound containing a six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring; and then heating the crosslinking agent to be completely melted, stirring the melted crosslinking agent and low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
11. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: heating the graftable aromatic ketone compound containing the six-membered chelate ring to be completely melted, stirring the graftable aromatic ketone compound with low-density polyethylene particles, and soaking the graftable aromatic ketone compound and the low-density polyethylene particles for 2 to 24 hours at the temperature of 60 to 100 ℃ until all liquid is absorbed by the particles; adding an antioxidant, melting and mixing at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with a graftable aromatic ketone compound containing a six-membered chelate ring and the antioxidant; and then heating the cross-linking agent to be completely melted, stirring the cross-linking agent and low-density polyethylene particles mixed with the graftable aromatic ketone compound containing the six-membered chelate ring and the antioxidant, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
12. The method for preparing the crosslinked polyethylene cable insulation material containing the high-voltage resistant performance compounding agent as claimed in claim 5, wherein the specific operation process of the mixing and granulating of the first step is as follows: mixing the six-membered chelate ring-containing graftable aromatic ketone compound and the antioxidant, heating to completely melt the mixture, stirring the mixture with low-density polyethylene particles, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain plastic particles mixed with the antioxidant and the six-membered chelate ring-containing graftable aromatic ketone compound; then melting and mixing the antioxidant and plastic particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring at 105-170 ℃, and then extruding and granulating to obtain low-density polyethylene particles mixed with the antioxidant and the graftable aromatic ketone compound containing the six-membered chelate ring; and then heating the cross-linking agent to be completely melted, stirring the cross-linking agent and low-density polyethylene particles mixed with the graftable aromatic ketone compound containing the six-membered chelate ring and the antioxidant, and soaking the mixture for 2 to 24 hours at the temperature of between 60 and 100 ℃ until all liquid is absorbed by the particles to obtain the plastic particles mixed with the additive.
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Cited By (5)
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| CN114479240A (en) * | 2022-01-26 | 2022-05-13 | 国网江苏省电力有限公司南京供电分公司 | Insulating material for high-voltage alternating-current cable and preparation method thereof |
| CN114621512A (en) * | 2022-05-17 | 2022-06-14 | 浙江大学杭州国际科创中心 | Cable insulation material and preparation method thereof |
| CN115028775A (en) * | 2022-06-23 | 2022-09-09 | 哈尔滨理工大学 | Graft modified crosslinked polyethylene insulating layer and preparation method and application thereof |
| CN115709555A (en) * | 2022-11-11 | 2023-02-24 | 宏岳塑胶集团股份有限公司 | Production process of crosslinked polyethylene PE-Xa (polyethylene-Xa) pipe and high-speed raw material mixer |
| CN117264418A (en) * | 2023-11-17 | 2023-12-22 | 河南华佳新材料技术有限公司 | Metallized film for flexible direct current power transmission and transformation converter capacitor and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114479240A (en) * | 2022-01-26 | 2022-05-13 | 国网江苏省电力有限公司南京供电分公司 | Insulating material for high-voltage alternating-current cable and preparation method thereof |
| CN114621512A (en) * | 2022-05-17 | 2022-06-14 | 浙江大学杭州国际科创中心 | Cable insulation material and preparation method thereof |
| CN114621512B (en) * | 2022-05-17 | 2022-08-05 | 浙江大学杭州国际科创中心 | Cable insulation material and preparation method thereof |
| CN115028775A (en) * | 2022-06-23 | 2022-09-09 | 哈尔滨理工大学 | Graft modified crosslinked polyethylene insulating layer and preparation method and application thereof |
| CN115709555A (en) * | 2022-11-11 | 2023-02-24 | 宏岳塑胶集团股份有限公司 | Production process of crosslinked polyethylene PE-Xa (polyethylene-Xa) pipe and high-speed raw material mixer |
| CN117264418A (en) * | 2023-11-17 | 2023-12-22 | 河南华佳新材料技术有限公司 | Metallized film for flexible direct current power transmission and transformation converter capacitor and preparation method thereof |
| CN117264418B (en) * | 2023-11-17 | 2024-01-26 | 河南华佳新材料技术有限公司 | Metallized film for flexible direct current power transmission and transformation converter capacitor and preparation method thereof |
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Application publication date: 20211203 |