CN115512887A - Crosslinked polyethylene heat-resistant insulated cable - Google Patents
Crosslinked polyethylene heat-resistant insulated cable Download PDFInfo
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- CN115512887A CN115512887A CN202211222008.3A CN202211222008A CN115512887A CN 115512887 A CN115512887 A CN 115512887A CN 202211222008 A CN202211222008 A CN 202211222008A CN 115512887 A CN115512887 A CN 115512887A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/40—Insulated conductors or cables characterised by their form with arrangements for facilitating mounting or securing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention relates to the technical field of cables, in particular to a crosslinked polyethylene heat-resistant insulated cable which comprises an outer sheath and a plurality of cable cores, wherein each cable core comprises a polyethylene inner sheath and a conductor; the outer sheath is prepared from the following raw materials: 100-120 parts of silane cross-linked polyethylene, 20-30 parts of low-density polyethylene, 30-40 parts of polyolefin elastomer, 20-30 parts of polyamide polysiloxane block copolymer, 10-15 parts of DOPO modified epoxy resin, 30-50 parts of carbon black, 25-40 parts of nano calcium carbonate, 3-5 parts of di-n-octyl adipate, 1-2 parts of polyol benzoate, 0.5-1 part of cross-linking agent BIBP and 0-5 parts of other auxiliary agents.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a crosslinked polyethylene heat-resistant insulated cable.
Background
The cross-linked polyethylene insulated cable is a widely used cable, has simple structure, light weight, strong load capacity, difficult melting, chemical corrosion resistance and high mechanical strength, and has incomparable advantages compared with the polyvinyl chloride insulated cable.
Although cross-linked polyethylene (XLPE) has many outstanding advantages as an insulating material, the working temperature of the cross-linked polyethylene (XLPE) can only reach 90 ℃ at most, the Vicat softening temperature is 120-130 ℃, the working temperature of the existing polyvinyl chloride insulated cable can reach 105 ℃, the Vicat softening temperature is more than or equal to 130 ℃, and how to improve the heat resistance of the cross-linked polyethylene cable becomes the focus of current research.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problem, the invention provides a crosslinked polyethylene heat-resistant insulated cable.
The adopted technical scheme is as follows:
a cross-linked polyethylene heat-resistant insulated cable comprises an outer sheath and a plurality of cable cores, wherein each cable core comprises a polyethylene inner sheath and a conductor;
the outer sheath is prepared from the following raw materials in parts by weight:
further, the outer sheath is prepared from the following raw materials in parts by weight:
further, the density of the silane crosslinked polyethylene is 0.960-0.980g/cm 3 The melt index is 4.5-5g/10min, and the test condition of the melt index is 190 ℃/2.16kg;
the linear low density polyethylene has a density of 0.910 to 0.925g/cm 3 The melt index is 1-2g/10min, and the test condition of the melt index is 190 ℃/2.16kg.
Further, the preparation method of the polyamide-type polysiloxane block copolymer is as follows:
under the protection of nitrogen, 4' -diaminodiphenyl ether, pyromellitic dianhydride and DMF are uniformly mixed, aminopropyl terminated polydimethylsiloxane is added, the mixture reacts for 1 to 2 hours at room temperature, the temperature is raised to 80 to 100 ℃ for reaction for 5 to 7 hours, the small molecular components are removed by reduced pressure distillation, and the vacuum heat preservation is carried out for 18 to 24 hours at the temperature of 40 to 60 ℃.
Further, the molar ratio of the 4,4' -diaminodiphenyl ether to the pyromellitic dianhydride is 1:1.015-1.020;
the using amount of the aminopropyl terminated polydimethylsiloxane is 10-45 percent of the total mass of the 4,4' -diaminodiphenyl ether and the pyromellitic dianhydride, and the preferred using amount is 15 percent.
Further, the preparation method of the DOPO modified epoxy resin comprises the following steps:
heating the epoxy resin to 75-90 ℃, adding DOPO and triphenylphosphine, uniformly stirring, heating to 150-160 ℃, and reacting for 6-10 h.
Further, the other auxiliary agents comprise any one or more of a lubricant, an antioxidant, a flex crack inhibitor, a light stabilizer, a harmful metal inhibitor, an anti-aging agent, a termite preventing agent, a rat bite preventing agent and a mildew preventing agent.
Further, the rest auxiliary agents comprise a lubricant, an antioxidant and a light stabilizer;
the lubricant is stearate, preferably calcium stearate;
the antioxidant is an antioxidant 1010 and an antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1-2, the mass ratio of the antioxidant 1010 to the antioxidant 168 is preferably 1:1;
the light stabilizer is a hindered amine light stabilizer, preferably light stabilizer 622.
Further, still include mica around band, steel band armor, metallic shield layer and PP packing rope.
Furthermore, the mica wrapping tape is used for fixedly wrapping the plurality of cable cores and the PP filling ropes, a metal shielding layer is wrapped outside the mica wrapping tape, a steel strip armoring layer is wrapped outside the metal shielding layer, and an outer sheath is wrapped outside the steel strip armoring layer.
The invention has the beneficial effects that:
the invention provides a cross-linked polyethylene heat-resistant insulated cable, wherein after polyethylene is cross-linked by silane, macromolecules are converted into a three-dimensional net structure from a linear structure, a multiphase system with a crystalline structure, an amorphous structure and a cross-linked structure is formed, the cable has higher strength, rigidity, compactness and barrier property, a polyolefin elastomer has excellent flow property, after the addition of the polyolefin elastomer, the impact resistance and heat resistance of an outer sheath can be improved, polyimide has excellent high-temperature resistance, but the structural rigidity of the polyimide is poorer, the processing property of the polyimide is improved, the flow property is improved, and the heat resistance and aging resistance are improved, DOPO modified epoxy resin can improve the heat resistance, the introduction of a phosphaphenanthrene group and the flame resistance are also improved.
Drawings
FIG. 1 is a schematic structural view of a heat-resistant insulated crosslinked polyethylene cable according to the present invention;
in the figure:
1-outer sheath, 2-steel strip armor layer, 3-metal shielding layer, 4-mica lapping tape, 5-PP filling rope, 6-conductor and 7-polyethylene inner sheath.
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The prior art is referred to in the art for techniques not mentioned in the present invention.
Example 1:
referring to fig. 1, a cross-linked polyethylene heat-resistant insulated cable comprises an outer sheath (1) and a plurality of cable cores, wherein each cable core comprises a polyethylene inner sheath (7) and a conductor (6), a mica wrapping tape (4) wraps and fixes the plurality of cable cores and a PP (polypropylene) filling rope (5), a metal shielding layer (3) made of a tinned copper wire is coated outside the mica wrapping tape (4), a steel strip armoring layer (2) is coated outside the metal shielding layer (3), and the outer sheath (1) is coated outside the steel strip armoring layer (2);
the outer sheath (1) is prepared from the following raw materials in parts by weight:
silane crosslinked polyethylene (Germany Bayer, density 0.960g/cm 3 The melt index is 4.5g/10min, the test condition of the melt index is 190 ℃/2.16 kg) 110 parts of low density polyethylene (super Rong plastics raw materials Co., ltd., dongguan, china petrochemical, density is 0.918g/cm 3 The melt index is 1.9g/10min, and the test conditions of the melt index are 190 ℃/2.16 kg) 25 parts, 30 parts of polyolefin elastomer, 20 parts of polyamide polysiloxane block copolymer (self-made), 12 parts of DOPO modified epoxy resin (self-made), 40 parts of carbon black N330 (Henan Ruibo chemical Co., ltd.), 40 parts of nano calcium carbonate (Jinxin powder science and technology Co., ltd., dongguan city), and di-N-octyl adipate (Hubei Shuangyan, CAS: 123-79-5), 3 parts of polyol benzoate (wuhan eosin, CAS: 120-55-8), a crosslinking agent BIBP (Novarrieb New Material Co., ltd., CAS: 025155-25-3) 0.8 parts of calcium stearate (a new material from Nostoc Flagelliforme)Department, CAS: 1592-23-0), antioxidant 1010 (Shandong Xuxiang chemical Co., ltd.), antioxidant 168 (Shandong Xuxiang chemical Co., ltd.), and light stabilizer 622 (Shandong Xuxiang chemical Co., ltd.) in an amount of 0.5 parts.
The preparation method of the polyamide-type polysiloxane block copolymer comprises the following steps:
introducing nitrogen into a reaction kettle provided with a thermometer and a condenser tube for protection, adding 200.24g of 4,4' -diaminodiphenyl ether, 222.48g of pyromellitic dianhydride and 1.5L of DMF, stirring and mixing uniformly, adding 63.41g of aminopropyl terminated polydimethylsiloxane, reacting at room temperature for 1.5h, heating to 100 ℃ for reaction for 6h, distilling under reduced pressure to remove small molecular components, and carrying out vacuum heat preservation at 60 ℃ for 24 h.
The preparation method of the DOPO modified epoxy resin comprises the following steps:
introducing nitrogen into a reaction kettle provided with a thermometer and a condenser tube for protection, adding 160g of E-20 epoxy resin, stirring and heating to 90 ℃, adding 20g of DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and 17g of triphenylphosphine, stirring uniformly, heating to 160 ℃, reacting for 8 hours, and cooling to room temperature.
The outer sheath (1) is prepared by the following method:
uniformly mixing silane crosslinked polyethylene, low-density polyethylene, polyolefin elastomer, polyamide polysiloxane block copolymer, DOPO modified epoxy resin, carbon black, nano calcium carbonate, di-n-octyl adipate, polyol benzoate, a crosslinking agent BIBP, calcium stearate, an antioxidant 1010, an antioxidant 168 and a light stabilizer 622, putting the mixture into a charging barrel of a double-screw extruder, extruding and plasticizing the mixture by the double-screw extruder, cooling and granulating the mixture, and drying the obtained granules in a dryer at 80 ℃ to constant weight to obtain a cable sheath material; wherein the temperature of each zone of the double-screw extruder is set as follows: a first barrel area: 155 + -5 ℃, barrel two zone: 160 +/-5 ℃, three zones of a machine barrel: 165 ± 5 ℃, barrel four zones: 170 + -5 deg.C, barrel five zones: 175 ± 5 ℃, six zones of the machine barrel: 180 +/-5 ℃, seven zones of a machine barrel: 180 +/-5 ℃, eight zones of a machine barrel: 190 ± 5 ℃, nine zones of the machine barrel: 195 ± 5 ℃, head: 200 +/-5 ℃.
The main performance of the heat-resistant insulated cable prepared by the embodiment is detected, and all performance indexes meet the preset design requirements, specifically as follows:
example 2:
essentially the same as in example 1, with the difference that the outer sheath (1) is prepared from the following raw materials:
silane crosslinked polyethylene (Bayer, germany, density 0.960g/cm 3 The melt index is 4.5g/10min, the test condition of the melt index is 190 ℃/2.16 kg) 120 parts of low density polyethylene (super Rong plastics raw materials Co., ltd., dongguan, china petrochemical, density is 0.918g/cm 3 The melt index is 1.9g/10min, and the test conditions of the melt index are 190 ℃/2.16 kg) 30 parts, 40 parts of polyolefin elastomer, 30 parts of polyamide polysiloxane block copolymer (self-made), 15 parts of DOPO modified epoxy resin (self-made), 50 parts of carbon black N330 (Henan Ruibo chemical Co., ltd.), 40 parts of nano calcium carbonate (Jinxin powder science and technology Co., ltd., dongguan city), and di-N-octyl adipate (Hubei Shuangyan, CAS: 123-79-5), 5 parts of polyol benzoate (wuhan eosin, CAS: 120-55-8), a crosslinking agent BIBP (Novarrieb New Material Co., ltd., CAS: 025155-25-3), 1 part of calcium stearate (Novarriemo new materials Co., ltd., CAS: 1592-23-0), antioxidant 1010 (Shandong Xuxiang chemical Co., ltd.), antioxidant 168 (Shandong Xuxiang chemical Co., ltd.), and light stabilizer 622 (Shandong Xuxiang chemical Co., ltd.) in an amount of 0.5 parts.
The main performance of the heat-resistant insulated cable prepared by the embodiment is detected, and all performance indexes reach the preset design requirements
Example 3:
essentially the same as in example 1, with the difference that the outer sheath (1) is prepared from the following raw materials:
silane crosslinked polyethylene (Germany Bayer, density 0.960g/cm 3 100 portions of low density polyethylene (super plastic of Dongguan city) with the melt index of 4.5g/10min and the test condition of the melt index of 190 ℃/2.16kgCollagen Limited, mesopetrochemical, having a density of 0.918g/cm 3 The melt index is 1.9g/10min, and the test conditions of the melt index are 190 ℃/2.16 kg) 20 parts, polyolefin elastomer 30 parts, polyamide type polysiloxane block copolymer (self-made) 20 parts, DOPO modified epoxy resin (self-made) 10 parts, carbon black N330 (henbane chemical limited) 30 parts, nano calcium carbonate (jinxin powder science and technology limited, tokuan) 25 parts, di-N-octyl adipate (CAS: 123-79-5), 3 parts of polyol benzoate (wuhan eosin, CAS: 120-55-8), a crosslinking agent BIBP (Noveltrione New materials Co., ltd., CAS: 025155-25-3), 0.5 parts of calcium stearate (Novo Mimo materials Co., ltd., CAS: 1592-23-0), antioxidant 1010 (Shandong Xuxiang chemical Co., ltd.), antioxidant 168 (Shandong Xuxiang chemical Co., ltd.), and light stabilizer 622 (Shandong Xuxiang chemical Co., ltd.) in an amount of 0.5 parts.
The main performance of the heat-resistant insulated cable prepared by the embodiment is detected, and all performance indexes reach the preset design requirements
Example 4:
essentially the same as in example 1, with the difference that the outer sheath (1) is prepared from the following raw materials:
silane crosslinked polyethylene (Germany Bayer, density 0.960g/cm 3 The melt index is 4.5g/10min, the test condition of the melt index is 190 ℃/2.16 kg) 120 parts of low-density polyethylene (super Rong plastics materials Co., ltd., dongguan city, china petrochemical, density is 0.918g/cm 3 The melt index is 1.9g/10min, and the test conditions of the melt index are 190 ℃/2.16 kg) 20 parts, 40 parts of polyolefin elastomer, 20 parts of polyamide polysiloxane block copolymer (self-made), 15 parts of DOPO modified epoxy resin (self-made), 30 parts of carbon black N330 (Henan Rahbo chemical Co., ltd.), 40 parts of nano calcium carbonate (Kingxin powder science and technology Co., ltd.) 40 parts, and di-N-octyl adipate (Hubei Shuangyan, CAS: 123-79-5), 3 parts of polyol benzoate (wuhan eosin, CAS: 120-55-8), a crosslinking agent BIBP (novelties new materials, inc, CAS: 025155-25-3), 0.5 parts of calcium stearate (Novo Mimo materials Co., ltd., CAS: 1592-23-0), 1.5 parts of antioxidant 1010 (Shandong Xuxiang chemical industry)Limited company) 0.5 parts, antioxidant 168 (Shandong Xuxiang chemical Co., ltd.) 0.5 parts, and light stabilizer 622 (Shandong Xuxiang chemical Co., ltd.) 0.5 parts.
The main performance of the heat-resistant insulated cable prepared by the embodiment is detected, and all performance indexes reach the preset design requirements
Example 5:
essentially the same as in example 1, with the difference that the outer sheath (1) is prepared from the following raw materials:
silane crosslinked polyethylene (Germany Bayer, density 0.960g/cm 3 The melt index is 4.5g/10min, the test condition of the melt index is 190 ℃/2.16 kg) 100 parts of low density polyethylene (super Rong plastics materials Co., ltd., dongguan city, china petrochemical, density is 0.918g/cm 3 The melt index is 1.9g/10min, and the test conditions of the melt index are 190 ℃/2.16 kg) 30 parts, 30 parts of polyolefin elastomer, 30 parts of polyamide polysiloxane block copolymer (self-made), 10 parts of DOPO modified epoxy resin (self-made), 50 parts of carbon black N330 (Henan Ruibo chemical Co., ltd.), 25 parts of nano calcium carbonate (Jinxin powder science and technology Co., ltd., dongguan city), and di-N-octyl adipate (Hubei Shuangyan, CAS: 123-79-5), 5 parts of polyol benzoate (wuhan eosin, CAS: 120-55-8), a crosslinking agent BIBP (Novarrieb New Material Co., ltd., CAS: 025155-25-3), 1 part of calcium stearate (Novarriemo new materials Co., ltd., CAS: 1592-23-0), antioxidant 1010 (Shandong Xuxiang chemical Co., ltd.), antioxidant 168 (Shandong Xuxiang chemical Co., ltd.), and light stabilizer 622 (Shandong Xuxiang chemical Co., ltd.) in an amount of 0.5 parts.
The main performance of the heat-resistant insulated cable prepared by the embodiment is detected, and all performance indexes reach the preset design requirements
Comparative example 1:
substantially the same as in example 1, except that the DOPO-modified epoxy resin was not added.
Comparative example 2:
essentially the same as in example 1, except that no polyamide-type polysiloxane block copolymer was added.
Comparative example 3:
essentially the same as in example 1, except that di-n-octyl adipate was not added.
Comparative example 4:
essentially the same as example 1, except that no polyol benzoate was added.
And (3) performance testing:
(1) the oversheath (1) prepared in the examples 1 to 5 and the comparative examples 1 to 4 of the invention is used as a sample for performance test;
and (3) testing tensile property: testing the tensile strength and the elongation at break of the material by adopting an electronic material universal testing machine according to the GB/T1040-92 standard;
testing the notch impact strength of the cantilever beam: according to GB/T16420-1998 standard;
the Vicat Softening Temperature (VST) is tested according to GB/T1633-2000;
the test results are shown in table 1 below:
table 1:
as can be seen from the above table 1, the cable outer sheath prepared by the invention has excellent mechanical properties, can effectively protect the normal operation of the cable core from mechanical damage, has a Vicat softening temperature which is one of indexes for evaluating heat resistance and reflecting the physical and mechanical properties of a product under a heated condition, has a Vicat softening temperature of more than or equal to 140 ℃, and has good heat resistance.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cross-linked polyethylene heat-resistant insulated cable is characterized by comprising an outer sheath and a plurality of cable cores, wherein each cable core comprises a polyethylene inner sheath and a conductor;
the outer sheath is prepared from the following raw materials in parts by weight:
2. the crosslinked polyethylene heat-resistant insulated cable according to claim 1, wherein the outer sheath is prepared from the following raw materials in parts by weight:
3. the crosslinked polyethylene heat-resistant insulated cable according to claim 1, wherein the silane crosslinked polyethylene has a density of 0.960-0.980g/cm 3 The melt index is 4.5-5g/10min, and the test condition of the melt index is 190 ℃/2.16kg;
the linear low density polyethylene has a density of 0.910 to 0.925g/cm 3 The melt index is 1-2g/10min, and the test condition of the melt index is 190 ℃/2.16kg.
4. The crosslinked polyethylene heat-resistant insulated cable according to claim 1, wherein the polyamide-type polysiloxane block copolymer is prepared by the following method:
under the protection of nitrogen, 4' -diaminodiphenyl ether, pyromellitic dianhydride and DMF are uniformly mixed, aminopropyl terminated polydimethylsiloxane is added, the mixture reacts for 1 to 2 hours at room temperature, the temperature is raised to 80 to 100 ℃ for reaction for 5 to 7 hours, the small molecular components are removed by reduced pressure distillation, and the vacuum heat preservation is carried out for 18 to 24 hours at the temperature of 40 to 60 ℃.
5. The crosslinked polyethylene heat-resistant insulated cable according to claim 4, wherein the molar ratio of 4,4' -diaminodiphenyl ether to pyromellitic dianhydride is 1:1.015-1.020;
the using amount of the aminopropyl terminated polydimethylsiloxane is 10-45 percent of the total mass of the 4,4' -diaminodiphenyl ether and the pyromellitic dianhydride, and the preferred using amount is 15 percent.
6. The crosslinked polyethylene heat-resistant insulated cable according to claim 1, wherein the DOPO-modified epoxy resin is prepared by the following method:
heating the epoxy resin to 75-90 ℃, adding DOPO and triphenylphosphine, uniformly stirring, heating to 150-160 ℃, and reacting for 6-10 h.
7. The crosslinked polyethylene heat-resistant insulated cable according to claim 1, wherein the remaining additives comprise any one or more of a lubricant, an antioxidant, a flex crack inhibitor, a light stabilizer, a harmful metal inhibitor, an anti-aging agent, a termite inhibitor, a rat bite inhibitor, and a mold inhibitor.
8. The crosslinked polyethylene heat resistant insulated cable according to claim 7, wherein the remaining additives comprise lubricants, antioxidants, light stabilizers;
the lubricant is stearate, preferably calcium stearate;
the antioxidant is an antioxidant 1010 and an antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1-2, the mass ratio of the antioxidant 1010 to the antioxidant 168 is preferably 1:1;
the light stabilizer is a hindered amine light stabilizer, preferably light stabilizer 622.
9. The crosslinked polyethylene heat-resistant insulated cable according to claim 1, further comprising a mica wrapping tape, a steel tape armoring layer, a metal shielding layer and a PP filling cord.
10. The heat-resistant insulated cable of cross-linked polyethylene according to claim 9, wherein the mica tape wraps and fixes the plurality of cable cores and the PP filler ropes, the mica tape is wrapped with a metal shielding layer, the metal shielding layer is wrapped with a steel tape armoring layer, and the steel tape armoring layer is wrapped with the outer sheath.
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