CN115636999A - Nuclear-grade cable insulating material and preparation method thereof - Google Patents
Nuclear-grade cable insulating material and preparation method thereof Download PDFInfo
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- CN115636999A CN115636999A CN202211406873.3A CN202211406873A CN115636999A CN 115636999 A CN115636999 A CN 115636999A CN 202211406873 A CN202211406873 A CN 202211406873A CN 115636999 A CN115636999 A CN 115636999A
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- 239000011810 insulating material Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 53
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims abstract description 41
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims abstract description 19
- 239000006229 carbon black Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 12
- 150000002978 peroxides Chemical group 0.000 claims description 12
- 239000008096 xylene Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- CCNDOQHYOIISTA-UHFFFAOYSA-N 1,2-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1C(C)(C)OOC(C)(C)C CCNDOQHYOIISTA-UHFFFAOYSA-N 0.000 claims description 6
- 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
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical group CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 claims description 6
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 6
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 6
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 6
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 6
- FRVCGRDGKAINSV-UHFFFAOYSA-L iron(2+);octadecanoate Chemical compound [Fe+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O FRVCGRDGKAINSV-UHFFFAOYSA-L 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000000155 melt Substances 0.000 abstract description 3
- XHQSLVIGPHXVAK-UHFFFAOYSA-K iron(3+);octadecanoate Chemical compound [Fe+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XHQSLVIGPHXVAK-UHFFFAOYSA-K 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of cables and discloses a nuclear-grade cable insulating material and a preparation method thereof, wherein the nuclear-grade cable insulating material is prepared from the following raw materials in parts by mass: 60-100 parts of ultra-low density polyethylene, 1-3 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent, 10-30 parts of carbon black, 2-4 parts of antioxidant, 1-3 parts of stabilizer and 10-20 parts of solvent; the ultra-low density polyethylene adopts ULDPE with the density of 0.900 +/-0.003 g/cm < 3 > and the melt index of 1.0-3.0 g/10min as a main raw material, is soft and elastic, has small density and light weight, improves the insulativity of a cable through the auxiliary crosslinking agent, and improves the performances of the cable such as flame retardance, aging resistance, tear resistance and the like through fusing a plurality of specific compounds into an ultra-low density polyethylene base material.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a nuclear-grade cable insulating material and a preparation method thereof.
Background
There are two types of classification for nuclear power plant cables: the functional cable comprises a measuring cable, a communication cable, an instrument cable, a fireproof cable (a silicon insulation cable) and the like; the other type is divided according to the security level, the security level of the cable for the nuclear power station belongs to the IE level, the service life of the cable for the nuclear power station is more than 4O years, and the cable for the IE level nuclear power station is divided into K1, K2 and K3, namely 3 security levels.
Currently, XLPE is mostly adopted as a raw material for nuclear cables, and cables with more excellent performance are required with the continuous development of nuclear power, so a nuclear-grade cable insulating material and a preparation method thereof are provided to solve the problems in the industry.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a nuclear-grade cable insulating material and a preparation method thereof, which effectively solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
according to one aspect of the present invention, a nuclear grade cable insulation is provided.
The nuclear-grade cable insulation material is prepared from the following raw materials in parts by weight:
60-100 parts of ultra-low density polyethylene, 1-3 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent, 10-30 parts of carbon black, 2-4 parts of antioxidant, 1-3 parts of stabilizer and 10-20 parts of solvent.
Preferably, the crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butylperoxyisopropyl) benzene and dicumyl peroxide.
Preferably, the auxiliary crosslinking agent is one or two of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
Preferably, the antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
Preferably, the stabilizer is one or more of zinc petroleum sulfonate, ferric stearate and zinc stearate.
Preferably, the solvent is xylene.
According to another aspect of the invention, a method for preparing a nuclear grade cable insulation material is provided.
The preparation method of the nuclear-grade cable insulating material comprises the following steps:
s1: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
s2: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
s3: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
s4: placing the ultra-low density polyethylene mixture into a mixing mill for hot melting;
s5: making the hot-melted mixture into particles through a single-screw extruder;
s6: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by using an electron accelerator to obtain the insulating material.
Compared with the prior art, the invention has the beneficial effects that:
(1) The ultra-low density polyethylene adopts ULDPE with the density of 0.900 +/-0.003 g/cm < 3 > and the melt index of 1.0-3.0 g/10min as a main raw material, is soft and elastic, has small density and light weight, improves the insulativity of the cable through the auxiliary crosslinking agent, and improves the performances of the cable such as flame retardance, aging resistance, tear resistance and the like by fusing various specific compounds into the ultra-low density polyethylene base material.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1 is a flow chart of a nuclear grade cable insulation and a method of making the same according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
According to an embodiment of the present invention, a nuclear grade cable insulation is provided.
The nuclear-grade cable insulation material is prepared from the following raw materials in parts by weight:
60-100 parts of ultra-low density polyethylene, 1-3 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent, 10-30 parts of carbon black, 2-4 parts of antioxidant, 1-3 parts of stabilizer and 10-20 parts of solvent.
The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butyl peroxyisopropyl) benzene and dicumyl peroxide.
The auxiliary crosslinking agent is one or two of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
The antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
The stabilizer is one or more of zinc petroleum sulfonate, ferric stearate and zinc stearate.
The solvent is xylene.
In order to clearly understand the technical scheme of the invention, the technical scheme of the invention is described in detail through specific examples.
Example one
A nuclear-grade cable insulating material is prepared from the following raw materials in parts by mass:
60g of ultralow-density polyethylene, 1g of crosslinking agent, 0.5g of auxiliary crosslinking agent, 10g of carbon black, 2g of antioxidant, 1g of stabilizer and 10g of solvent.
The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butyl peroxyisopropyl) benzene and dicumyl peroxide.
The auxiliary crosslinking agent is one or two of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
The antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
The stabilizer is one or more of zinc petroleum sulfonate, ferric stearate and zinc stearate.
The solvent is xylene.
The preparation method of the nuclear-grade cable insulating material comprises the following steps:
s1: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
s2: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
s3: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
s4: placing the ultra-low density polyethylene mixture into a mixing roll for hot melting;
s5: making the hot-melted mixture into particles through a single-screw extruder;
s6: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by using an electron accelerator to obtain the insulating material.
Example two
A nuclear-grade cable insulating material is prepared from the following raw materials in parts by mass:
100g of ultra-low density polyethylene, 3g of a crosslinking agent, 1g of an auxiliary crosslinking agent, 30g of carbon black, 4g of an antioxidant, 3g of a stabilizer and 20g of a solvent.
The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butyl peroxyisopropyl) benzene and dicumyl peroxide.
The auxiliary crosslinking agent is one or two of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
The antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
The stabilizer is one or more of zinc petroleum sulfonate, ferric stearate and zinc stearate.
The solvent is xylene.
The preparation method of the nuclear-grade cable insulating material comprises the following steps:
s1: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
s2: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
s3: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
s4: placing the ultra-low density polyethylene mixture into a mixing roll for hot melting;
s5: preparing the mixture after hot melting into particles by a single-screw extruder;
s6: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by an electron accelerator to obtain the insulating material.
EXAMPLE III
A nuclear-grade cable insulating material is prepared from the following raw materials in parts by mass:
80g of ultra-low density polyethylene, 2g of a crosslinking agent, 0.8g of an auxiliary crosslinking agent, 20g of carbon black, 3g of an antioxidant, 2g of a stabilizer and 15g of a solvent.
The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butyl peroxyisopropyl) benzene and dicumyl peroxide.
The auxiliary crosslinking agent is one or two of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
The antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
The stabilizer is one or more of zinc petroleum sulfonate, ferric stearate and zinc stearate.
The solvent is xylene.
The preparation method of the nuclear-grade cable insulating material comprises the following steps:
s1: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
s2: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
s3: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
s4: placing the ultra-low density polyethylene mixture into a mixing mill for hot melting;
s5: preparing the mixture after hot melting into particles by a single-screw extruder;
s6: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by an electron accelerator to obtain the insulating material.
For the convenience of understanding the above technical solution of the present invention, the following detailed description is made on the flow of the above solution of the present invention with reference to the accompanying drawings, and specifically is as follows:
according to the embodiment of the invention, the preparation method of the nuclear-grade cable insulating material is also provided.
As shown in fig. 1, in the actual production process, the preparation of the nuclear grade cable insulation material comprises the following steps:
step S101: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
step S103: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
step S105: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
step S107: placing the ultra-low density polyethylene mixture into a mixing mill for hot melting;
step S109: making the hot-melted mixture into particles through a single-screw extruder;
step S111: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by using an electron accelerator to obtain the insulating material.
In conclusion, by means of the technical scheme, ULDPE with the density of 0.900 +/-0.003 g/cm & lt 3 & gt and the melt index of 1.0-3.0 g/10min is used as a main raw material of the ultra-low density polyethylene, the ultra-low density polyethylene is soft and elastic, has small density and light weight, improves the insulativity of a cable through an auxiliary crosslinking agent, and improves the performances of the cable, such as flame retardance, aging resistance, tear resistance and the like, through fusing a plurality of specific compounds into an ultra-low density polyethylene base material.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A nuclear-grade cable insulating material is characterized by being prepared from the following raw materials in parts by mass:
60-100 parts of ultra-low density polyethylene, 1-3 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent, 10-30 parts of carbon black, 2-4 parts of antioxidant, 1-3 parts of stabilizer and 10-20 parts of solvent.
2. The nuclear-grade cable insulation material of claim 1, wherein the crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is one or more of di-tert-butyl peroxide, di- (tert-butylperoxyisopropyl) benzene and dicumyl peroxide.
3. The core-grade cable insulation material of claim 1, wherein the co-crosslinking agent is one or both of trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
4. The nuclear-grade cable insulation of claim 1, wherein the antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol).
5. The nuclear-grade cable insulation of claim 1, wherein the stabilizer is one or more of zinc petroleum sulfonate, iron stearate, and zinc stearate.
6. The nuclear-grade cable insulation of claim 1, wherein the solvent is xylene.
7. A preparation method of a nuclear-grade cable insulating material, which is used for preparing the nuclear-grade cable insulating material of claim 1, comprises the following steps:
s1: placing the ultra-low density polyethylene in a drying box, setting the temperature to be 80 ℃, and drying for 24 hours;
s2: placing the dried ultra-low density polyethylene, an antioxidant, carbon black, a cross-linking agent, an auxiliary cross-linking agent, a stabilizer and a xylene solvent into a container to prepare a mixed solution;
s3: placing the container in a drying box for drying, and removing dimethylbenzene to obtain an ultra-low density polyethylene mixture;
s4: placing the ultra-low density polyethylene mixture into a mixing roll for hot melting;
s5: preparing the mixture after hot melting into particles by a single-screw extruder;
s6: and (3) preparing the particles into wires by a wire extruder, and performing irradiation crosslinking on the wires by an electron accelerator to obtain the insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406873.3A CN115636999A (en) | 2022-11-10 | 2022-11-10 | Nuclear-grade cable insulating material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406873.3A CN115636999A (en) | 2022-11-10 | 2022-11-10 | Nuclear-grade cable insulating material and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115636999A true CN115636999A (en) | 2023-01-24 |
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| CN202211406873.3A Pending CN115636999A (en) | 2022-11-10 | 2022-11-10 | Nuclear-grade cable insulating material and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000207961A (en) * | 1999-01-12 | 2000-07-28 | Hitachi Cable Ltd | Manufacture of cross-linked polyethylene electric wire and cable |
| CN102947384A (en) * | 2010-03-17 | 2013-02-27 | 北欧化工股份公司 | Polymer composition for w&c application with advantageous electrical properties |
| CN103694540A (en) * | 2013-12-16 | 2014-04-02 | 上海新上化高分子材料有限公司 | Soft high-mechanical-strength medium-voltage insulating material for ocean engineering cable and preparation method thereof |
| CN107204215A (en) * | 2017-03-30 | 2017-09-26 | 常州八益电缆股份有限公司 | A kind of used in nuclear power station coaxial cable |
-
2022
- 2022-11-10 CN CN202211406873.3A patent/CN115636999A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000207961A (en) * | 1999-01-12 | 2000-07-28 | Hitachi Cable Ltd | Manufacture of cross-linked polyethylene electric wire and cable |
| CN102947384A (en) * | 2010-03-17 | 2013-02-27 | 北欧化工股份公司 | Polymer composition for w&c application with advantageous electrical properties |
| CN103694540A (en) * | 2013-12-16 | 2014-04-02 | 上海新上化高分子材料有限公司 | Soft high-mechanical-strength medium-voltage insulating material for ocean engineering cable and preparation method thereof |
| CN107204215A (en) * | 2017-03-30 | 2017-09-26 | 常州八益电缆股份有限公司 | A kind of used in nuclear power station coaxial cable |
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