CN113004613A - Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer - Google Patents
Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer Download PDFInfo
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- CN113004613A CN113004613A CN202110253418.3A CN202110253418A CN113004613A CN 113004613 A CN113004613 A CN 113004613A CN 202110253418 A CN202110253418 A CN 202110253418A CN 113004613 A CN113004613 A CN 113004613A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 60
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 60
- -1 polypropylene Polymers 0.000 title claims abstract description 58
- 230000036961 partial effect Effects 0.000 title claims abstract description 40
- 229920001971 elastomer Polymers 0.000 title claims abstract description 37
- 239000000806 elastomer Substances 0.000 title claims abstract description 37
- 239000011810 insulating material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims abstract description 23
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000005977 Ethylene Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 6
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000010893 electron trap Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention relates to a preparation method of a polypropylene insulating material with high partial discharge tolerance based on an elastomer, which is characterized in that the elasticity modulus of the polypropylene insulating material is reduced by adding an octene ethylene elastomer, the polypropylene insulating material is easy to deform under the bombardment of high-energy particles with partial discharge, the energy of charged particles is relieved, and the partial discharge tolerance of polypropylene is improved; the added octene ethylene elastomer has better ultraviolet radiation tolerance, and can relieve the accompanying ultraviolet radiation degradation phenomenon in the partial discharge process, thereby improving the partial discharge tolerance of the polypropylene; the trap depth of the polypropylene insulating material added with the octene ethylene elastomer is reduced, the dissipation of charges accumulated on the surface of polypropylene is accelerated, the proportion of charged particles directly bombarding the surface of the polypropylene material is weakened, and the partial discharge tolerance of polypropylene is improved.
Description
Technical Field
The invention belongs to the field of research and development of cable insulating materials, relates to a recyclable power cable main insulating polypropylene material, and particularly relates to a preparation method of an elastomer-based high partial discharge tolerance polypropylene insulating material.
Background
The development of an ultra/extra-high voltage alternating current transmission system puts higher requirements on the operation reliability of electrical equipment, a high-voltage cable is used as key power equipment of the transmission system, and the design level of a main insulating material is related to the safe and reliable operation of the power cable. Crosslinked polyethylene (XLPE) is widely used as a main cable insulation material due to its excellent electrical and mechanical properties, but its melting point is low, crosslinking process is complex, impurities are easily doped, and it is not recoverable, which has accelerated the research on new generation cable insulation materials. Compared with XLPE, polypropylene (PP) has higher melting point, can bear higher operating temperature, belongs to thermoplastic materials, and has the excellent characteristics of environmental protection and recyclability, thereby having wide application prospect.
However, during the actual operation of the power cable, the electric field distortion caused by the defects inside the material can generate partial discharge, gradually erode the insulating material, cause irreversible damage, reduce the insulating property of the polymer material and seriously threaten the operation safety of the cable.
At present, few reports are reported at home and abroad for the partial discharge tolerance of polypropylene insulating materials, and no related patent for improving the partial discharge tolerance is available. From the viewpoint of prolonging the service life of the power cable and improving the long-term operation reliability, a method for effectively improving the partial discharge tolerance of the polypropylene material is urgent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a polypropylene insulating material with high partial discharge tolerance based on an elastomer.
The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of an elastomer-based polypropylene insulating material with high partial discharge tolerance is characterized by comprising the following steps: the method comprises the following steps:
1) selecting isotactic polypropylene as a main material, taking an octene ethylene elastomer as a filler, cleaning the main material and the filler by using absolute ethyl alcohol, and drying in a vacuum drying oven at 40-60 ℃ for 24 hours;
2) uniformly mixing 18-22% of octene ethylene elastomer and isotactic polypropylene, placing the mixture in a double-roller stirrer at the temperature of 180 ℃ and the rotating speed of 30r/min for melt blending for 5min, and then extruding, cooling and drying to obtain polypropylene-based blend master batches;
3) and (3) performing compression treatment on the obtained master batch by using a high-temperature tablet press at 190 ℃ under the action of 16MPa for 5min to obtain a toughened and modified polypropylene film, so as to prepare the insulating material with partial discharge tolerance.
In the step 1), the isotactic degree of the isotactic polypropylene is 96% or more.
And in the step 1), the content of the octene in the octene ethylene elastomer is more than 50%, and the content of the ethylene monomer is more than 20%.
And in the step 3), during the compression treatment, the master batch needs to be cooled to the room temperature at the speed of 10-15 ℃/min.
The invention has the advantages and beneficial effects that:
1. according to the preparation method of the elastomer-based high partial discharge tolerance polypropylene insulating material, disclosed by the invention, the elasticity modulus of the polypropylene insulating material added with the octene ethylene elastomer is reduced, the polypropylene insulating material is easy to deform under the bombardment of high-energy particles in partial discharge, the energy of charged particles is relieved, and the partial discharge tolerance of polypropylene is improved.
2. According to the preparation method of the elastomer-based high partial discharge tolerance polypropylene insulating material, the added octene ethylene elastomer has better ultraviolet radiation tolerance and can relieve the accompanying ultraviolet radiation degradation phenomenon in the partial discharge process, so that the partial discharge tolerance of polypropylene is improved.
3. According to the preparation method of the elastomer-based high partial discharge tolerance polypropylene insulating material, the trap depth of the polypropylene insulating material added with the octene ethylene elastomer is reduced, the charge dissipation accumulated on the surface of polypropylene is accelerated, the proportion of charged particles directly bombarding the surface of the polypropylene material is weakened, the partial discharge tolerance of the polypropylene is improved, and the partial discharge erosion tolerance capacity can be improved by 62.5%.
Drawings
FIG. 1 is a graph of film elongation at break and tensile strength for various octene ethylene elastomer addition levels in accordance with the present invention;
FIG. 2 is a graph of the electron trap levels of thin films of the present invention at various levels of octenylethylene elastomer addition;
FIG. 3 is a block diagram of a partial discharge system for a pin-plate electrode of the present invention;
FIG. 4 is a graph of film erosion depth for different octene ethylene elastomer addition levels in accordance with the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A preparation method of an elastomer-based polypropylene insulating material with high partial discharge tolerance is characterized by comprising the following steps: the method comprises the following steps:
1) selecting isotactic polypropylene with isotacticity of more than or equal to 96% as a main material, using an octene ethylene elastomer as a filler, copolymerizing octene with content of more than 50% and ethylene monomer with content of more than 20%, cleaning the main material and the filler by using absolute ethyl alcohol, and drying in a vacuum drying oven at 40-60 ℃ for 24 hours;
2) uniformly mixing 18-22% of octene ethylene elastomer and isotactic polypropylene, placing the mixture in a double-roller stirrer at the temperature of 180 ℃ and the rotating speed of 30r/min for melt blending for 5min, and then extruding, cooling and drying to obtain polypropylene-based blend master batches;
3) and (3) performing compression treatment on the obtained master batch by using a high-temperature tablet press at 190 ℃ under the action of 16MPa for 5min, and cooling the master batch to room temperature at the speed of 10-15 ℃/min to obtain a toughened and modified polypropylene film, so as to prepare the insulating material with partial discharge tolerance.
The elongation at break and tensile strength of polypropylene blended insulation at different octene ethylene elastomer addition levels are shown in figure 1. With the increase of the adding content, the tensile strength of the polypropylene insulating material is continuously reduced, the elongation at break is continuously increased, the elastic modulus of the polypropylene insulating material added with the octene ethylene elastomer is reduced, the polypropylene insulating material has excellent mechanical properties, and the requirement of cable insulation is met.
The isothermal surface potential decay method is adopted to measure the electron trap energy levels of the thin film under different addition contents of the octene ethylene elastomer, and is shown in figure 2. As can be seen, as the elastomer content increases from 0 wt% to 30 wt%, the electron trap level decreases from 0.961eV to 0.914 eV. The shallow trap energy level is beneficial to the dissipation of charges along the surface and is beneficial to the improvement of the partial discharge tolerance of the polypropylene insulating material.
Fig. 3 is a structural diagram of a partial discharge erosion system, in which the erosion state of the surface of a film after a 2-hour needle-plate electrode partial discharge experiment on a polypropylene insulating material is measured by a 3D surface profiler, and an erosion depth value under a unit discharge amount is calculated, which effectively represents the strength of the polypropylene material partial discharge tolerance, and the result is shown in fig. 4. The change trend of the erosion depth of the polypropylene blending material after the partial discharge erosion shows a trend of decreasing firstly and then increasing, and reaches the lowest under the addition content of 20wt percent. This shows that the partial discharge tolerance of the polypropylene material added with the octene ethylene elastomer is superior to that of pure PP, and when the content of the added elastomer reaches 20 wt%, the partial discharge tolerance of the polypropylene material is effectively improved by 62.5%.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (4)
1. A preparation method of an elastomer-based polypropylene insulating material with high partial discharge tolerance is characterized by comprising the following steps: the method comprises the following steps:
1) selecting isotactic polypropylene as a main material, taking an octene ethylene elastomer as a filler, cleaning the main material and the filler by using absolute ethyl alcohol, and drying in a vacuum drying oven at 40-60 ℃ for 24 hours;
2) uniformly mixing 18-22% of octene ethylene elastomer and isotactic polypropylene, placing the mixture in a double-roller stirrer at the temperature of 180 ℃ and the rotating speed of 30r/min for melt blending for 5min, and then extruding, cooling and drying to obtain polypropylene-based blend master batches;
3) and (3) performing compression treatment on the obtained master batch by using a high-temperature tablet press at 190 ℃ under the action of 16MPa for 5min to obtain a toughened and modified polypropylene film, so as to prepare the insulating material with partial discharge tolerance.
2. The method for preparing an elastomer-based polypropylene insulation with high partial discharge resistance according to claim 1, wherein: the isotacticity of the isotactic polypropylene in the step 1) is more than or equal to 96 percent.
3. The method for preparing an elastomer-based polypropylene insulation with high partial discharge resistance according to claim 1, wherein: the content of octene in the octene ethylene elastomer in the step 1) is more than 50%, and the content of ethylene monomer is more than 20%.
4. The method for preparing an elastomer-based polypropylene insulation with high partial discharge resistance according to claim 1, wherein: and 3) during the compression treatment, cooling the master batch to room temperature at a speed of 10-15 ℃/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253418.3A CN113004613A (en) | 2021-03-08 | 2021-03-08 | Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer |
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| CN202110253418.3A CN113004613A (en) | 2021-03-08 | 2021-03-08 | Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110003567A (en) * | 2019-03-19 | 2019-07-12 | 天津大学 | Isotactic polypropylene cable insulation toughening modifying method based on high-compatibility principle |
| AU2020102278A4 (en) * | 2020-09-15 | 2020-11-12 | Tsinghua University | Preparation method of recyclable thermoplastic high-voltage direct-current cable nano composite insulating material |
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2021
- 2021-03-08 CN CN202110253418.3A patent/CN113004613A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110003567A (en) * | 2019-03-19 | 2019-07-12 | 天津大学 | Isotactic polypropylene cable insulation toughening modifying method based on high-compatibility principle |
| AU2020102278A4 (en) * | 2020-09-15 | 2020-11-12 | Tsinghua University | Preparation method of recyclable thermoplastic high-voltage direct-current cable nano composite insulating material |
Non-Patent Citations (4)
| Title |
|---|
| YU GAO ET: "Trap Distribution and Dielectric Breakdown of Isotactic Polypropylene/Propylene Based Elastomer With Improved Flexibility for DC Cable Insulation", 《IEEE ACCESS》 * |
| 徐航: "基于聚丙烯的高压直流电缆绝缘改性与空间电荷特性研究" * |
| 徐航等: "聚丙烯/弹性体复合材料机械与空间电荷特性", 《高电压技术》 * |
| 袁鑫: "弹性体与塑性体改性聚丙烯力学及介电性能研究" * |
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Application publication date: 20210622 |
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