CN111560089A - Preparation method of antioxidant graft modification-based crosslinked polyethylene insulating material - Google Patents
Preparation method of antioxidant graft modification-based crosslinked polyethylene insulating material Download PDFInfo
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- CN111560089A CN111560089A CN202010275824.5A CN202010275824A CN111560089A CN 111560089 A CN111560089 A CN 111560089A CN 202010275824 A CN202010275824 A CN 202010275824A CN 111560089 A CN111560089 A CN 111560089A
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- 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
- C08F8/00—Chemical modification by after-treatment
Abstract
The invention discloses a preparation method of a crosslinked polyethylene insulating material based on antioxidant graft modification, wherein a crosslinked polyethylene base material, DCP and an antioxidant are melted and blended at a high temperature, and the three are fully mixed by the shear stress of a double-roller machine to form an insulating sample which is uniformly blended. (1) And (3) drying: placing the crosslinked polyethylene base material, the DCP and the antioxidant in a drying box; (2) preheating: placing the granular cross-linked polyethylene base material, the DCP and the antioxidant on a double-roller machine, and fully heating until the raw materials are fully melted; (3) blending: opening a mechanical rotating device of the double-roller machine, fully extruding and dispersing the blend through the shearing stress between the double rollers, and fully melting and blending; (4) cooling and recovering: after the blend was cooled, the blend was carefully scooped out with a spatula and placed in a sample bag for additional experimental testing.
Description
Technical Field
The invention belongs to the field of modified polymer materials in high-voltage cable equipment manufacturing and preparation thereof, and relates to a preparation method of a crosslinked polyethylene insulating material based on antioxidant graft modification.
Background
The high-voltage direct-current cable is used as key equipment of a direct-current power transmission technology and plays an irreplaceable role in the aspects of island power transmission, urban power supply and new energy grid connection. Crosslinked Polyethylene (XLPE) insulated cables are widely used and developed in high-voltage power transmission engineering due to their advantages of light weight, high operating temperature, large transmission power, etc. With the further improvement of the DC transmission voltage class and the transmission power, the consumption of the XLPE cable in each voltage class is greatly increased.
Currently, XLPE insulation still has some problems that are difficult to overcome. In the long-term operation process of the direct-current cable, due to the long-term effects of electricity, heat and light, the insulating property of XLPE insulation is gradually degraded, and the XLPE insulation poses a potential threat to power transmission. The selection of proper antioxidant is an important method for inhibiting XLPE insulation aging and improving insulation performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and introduces a preparation method of a crosslinked polyethylene insulating material based on antioxidant graft modification. Dicumyl Peroxide (DCP) is adopted to carry out grafting reaction on an antioxidant and polyethylene insulation, so that the oxidation resistance of a polyethylene molecular chain is improved, and the antioxidant-modified crosslinked polyethylene insulation material with different properties from the original material is obtained.
In order to overcome the defects of the existing crosslinked polyethylene, the invention aims to provide a preparation method of a crosslinked polyethylene insulating material based on antioxidant graft modification.
The technical scheme adopted by the invention is a preparation method of the antioxidant graft modification-based crosslinked polyethylene insulating material, wherein the antioxidant is subjected to a grafting reaction with a polyethylene molecular chain through peroxide;
the crosslinked polyethylene base material, the DCP and the antioxidant are melted and blended at high temperature, and the three are fully mixed by the shearing stress of a double-roller machine to form an insulating sample which is blended uniformly.
The method specifically comprises the following steps:
(1) and (3) drying: placing the crosslinked polyethylene base material, the DCP and the antioxidant in a drying box;
(2) preheating: placing the granular cross-linked polyethylene base material, the DCP and the antioxidant on a double-roller machine, and fully heating until the raw materials are fully melted;
the raw materials are formed by mixing crosslinked polyethylene, DCP and an antioxidant, wherein the mass ratio of the crosslinked polyethylene to the DCP is 40:1-50:1, and the content of the antioxidant accounts for 0.3-0.5% of the total mass of the crosslinked polyethylene and the DCP;
(3) blending: opening a mechanical rotating device of the double-roller machine, fully extruding and dispersing the blend through the shearing stress between the double rollers, and fully melting and blending;
(4) cooling and recovering: after the blend was cooled, the blend was carefully scooped out with a spatula and placed in a sample bag for additional experimental testing.
The crosslinked polyethylene in the step (1) comprises a crosslinked polyethylene finished product prepared by irradiation crosslinking, peroxide crosslinking or silane crosslinking:
DCP is bis (1-methyl-1-phenylethyl) peroxide, and the antioxidant comprises antioxidant 1010, antioxidant 1076, antioxidant 618, antioxidant 626, antioxidant 300, antioxidant 1035 and mixtures thereof.
And (4) the rotating speed of the double-roller machine in the step (3) is 70-90 r/min.
Compared with the prior art, the invention has the following advantages:
(1) dicumyl Peroxide (DCP) is adopted to carry out grafting reaction on the antioxidant and polyethylene insulation, so that the oxidation resistance of a polyethylene molecular chain is improved, the insulation performance of crosslinked polyethylene is improved, and the service life of the crosslinked polyethylene is prolonged.
(2) The blend can be fully mixed by the shear stress at high temperature, and the electric field distortion caused by uneven distribution of the antioxidant and the DCP is avoided.
(3) The DCP is used as a grafting reaction initiator and can initiate a grafting reaction between the antioxidant and a crosslinked polyethylene matrix, so that the dispersibility of the antioxidant is improved, and the physical action between the antioxidant and a molecular chain is enhanced.
Advantageous effects
The antioxidant and the DCP are mixed into the crosslinked polyethylene base material through a melt blending process, so that the insulation strength and the aging life of the crosslinked polyethylene are hopefully improved, and the insulation reliability of the crosslinked polyethylene of the high-voltage direct-current cable is improved.
Detailed description of the preferred embodiments
The present invention will be further described below with reference to the accompanying drawings.
Example 1
(1) 50g of crosslinked polyethylene (manufactured by Yanshan petrochemical Co., Ltd.), 0.25g of antioxidant 1010 (manufactured by BASF in Germany) and 1g of DCP (manufactured by Astrazu blue Co., Ltd.) were placed in paper bowls, and dried in an oven at 160 ℃ for 24 hours to remove residual moisture in the test specimens.
(2) Placing the three dried solid raw materials on a clean double-roller machine, turning on a heating switch to enable the temperature of the double rollers to reach 160 ℃, and keeping for a period of time to enable the raw materials to be fully melted.
(3) And opening a mechanical motion switch of the double-roller machine, and setting the rotating speed to be 70r/min, so that the blended insulating material is fully extruded and mixed through the shearing stress between the double rollers. And continuously shoveling and stacking the edge blending insulating material at the center of the double-roller machine by using a shovel so that the insulating material is fully extruded and mixed. This step was repeated for 15 minutes.
(4) And (4) closing the heating device and the mechanical movement device of the double-roller machine, naturally cooling the sample to room temperature, shoveling the insulating material part out by a shovel, filling the insulating material part into a sample bag, and storing for further experiments in the future.
Example 2
(1) 50g of polyethylene (manufactured by Yanshan petrochemical Co., Ltd.), 0.25g of antioxidant 1010 (manufactured by BASF in Germany) and 1.25g of DCP (manufactured by Astrazu orchidaceae Co., Ltd.) were placed in paper bowls, and dried in an oven at 160 ℃ for 24 hours to remove residual moisture in the test specimens.
(2) Placing the three dried solid raw materials on a clean double-roller machine, turning on a heating switch to enable the temperature of the double rollers to reach 160 ℃, and keeping for a period of time to enable the raw materials to be fully melted.
(3) And opening a mechanical motion switch of the double-roller machine, and setting the rotating speed to be 90r/min, so that the blended insulating material is fully extruded and mixed through the shearing stress between the double rollers. And continuously shoveling and stacking the edge blending insulating material at the center of the double-roller machine by using a shovel so that the insulating material is fully extruded and mixed. This step was repeated for 15 minutes.
(4) And (4) closing the heating device and the mechanical movement device of the double-roller machine, naturally cooling the sample to room temperature, shoveling the insulating material part out by a shovel, filling the insulating material part into a sample bag, and storing for further experiments in the future.
The antioxidant may also be antioxidant 1076, antioxidant 618, antioxidant 626, antioxidant 300, antioxidant 1035, and mixtures thereof.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. The preparation method of the antioxidant graft modification-based crosslinked polyethylene insulating material is characterized in that the antioxidant is subjected to graft reaction with a polyethylene molecular chain through peroxide;
the crosslinked polyethylene base material, the DCP and the antioxidant are melted and blended at high temperature, and the three are fully mixed by the shearing stress of a double-roller machine to form an insulating sample which is blended uniformly.
2. The preparation method of the antioxidant graft modification-based crosslinked polyethylene insulation material as claimed in claim 1, which is characterized by comprising the following steps:
(1) and (3) drying: placing the crosslinked polyethylene base material, the DCP and the antioxidant in a drying box;
(2) preheating: placing the granular cross-linked polyethylene base material, the DCP and the antioxidant on a double-roller machine, and fully heating until the raw materials are fully melted;
the raw materials are formed by mixing crosslinked polyethylene, DCP and an antioxidant, wherein the mass ratio of the crosslinked polyethylene to the DCP is 40:1-50:1, and the content of the antioxidant accounts for 0.3-0.5% of the total mass of the crosslinked polyethylene and the DCP;
(3) blending: opening a mechanical rotating device of the double-roller machine, fully extruding and dispersing the blend through the shearing stress between the double rollers, and fully melting and blending;
(4) cooling and recovering: after the blend was cooled, the blend was carefully scooped out with a spatula and placed in a sample bag for additional experimental testing.
3. The method for preparing the antioxidant graft modification-based crosslinked polyethylene insulation material as claimed in claim 2, wherein the crosslinked polyethylene in the step (1) comprises a finished crosslinked polyethylene product prepared by irradiation crosslinking, peroxide crosslinking or silane crosslinking:
DCP is bis (1-methyl-1-phenylethyl) peroxide, and the antioxidant comprises antioxidant 1010, antioxidant 1076, antioxidant 618, antioxidant 626, antioxidant 300, antioxidant 1035 and mixtures thereof.
4. The method for preparing the antioxidant graft modification-based crosslinked polyethylene insulation material as claimed in claim 2, wherein the rotation speed of the twin-roll machine in the step (3) is 70-90 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010275824.5A CN111560089A (en) | 2020-04-09 | 2020-04-09 | Preparation method of antioxidant graft modification-based crosslinked polyethylene insulating material |
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| CN202010275824.5A CN111560089A (en) | 2020-04-09 | 2020-04-09 | Preparation method of antioxidant graft modification-based crosslinked polyethylene insulating material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115044103A (en) * | 2022-06-16 | 2022-09-13 | 濮阳市中原石化实业有限公司 | Special polyethylene composite additive for high-altitude areas |
| CN116178824A (en) * | 2023-03-14 | 2023-05-30 | 哈尔滨理工大学 | Crosslinked polyethylene insulating material and preparation method and application thereof |
-
2020
- 2020-04-09 CN CN202010275824.5A patent/CN111560089A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 张书华、刘伟军: "《高性能电缆材料及其应用技术》", 30 November 2015 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115044103A (en) * | 2022-06-16 | 2022-09-13 | 濮阳市中原石化实业有限公司 | Special polyethylene composite additive for high-altitude areas |
| CN115044103B (en) * | 2022-06-16 | 2023-09-19 | 濮阳市中原石化实业有限公司 | Polyethylene composite auxiliary agent special for high altitude area |
| CN116178824A (en) * | 2023-03-14 | 2023-05-30 | 哈尔滨理工大学 | Crosslinked polyethylene insulating material and preparation method and application thereof |
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Application publication date: 20200821 |