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Long-acting high-voltage direct-current breakdown resistant polyethylene resin as well as preparation method and application thereof

A polyethylene resin, DC breakdown technology, applied in the field of polyethylene resin, can solve the problems of easy migration and precipitation of voltage-resistant monomers, low breakdown field strength, etc.

Pending Publication Date: 2021-05-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the inherently low breakdown field strength of polyethylene insulating materials in the prior art, and the problem of easy migration and precipitation of voltage-resistant monomers, the present invention provides a long-term high-voltage DC breakdown polyethylene resin and its Preparation method and application

Method used

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  • Long-acting high-voltage direct-current breakdown resistant polyethylene resin as well as preparation method and application thereof
  • Long-acting high-voltage direct-current breakdown resistant polyethylene resin as well as preparation method and application thereof
  • Long-acting high-voltage direct-current breakdown resistant polyethylene resin as well as preparation method and application thereof

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preparation example Construction

[0035] The present invention provides a preparation method of a voltage-resistant monomer with a structure of formula (1), but is not limited thereto: dissolving p-hydroxyacetophenone in 2-butanone, then adding triethylamine, under the protection of an inert atmosphere (preferably Nitrogen), stirring at 0-4°C (stirring speed is not particularly limited, usually 115r / min) while adding the ether solution of methacryloyl chloride dropwise, the drop rate is preferably 5-7ml / min, after the dropwise addition is completed, the reaction 3 -4h, the obtained reaction solution was first washed with ether, then the filtrate was washed successively with 5wt% sodium hydroxide solution and deionized water, and finally the upper layer filtrate was separated, and the solvent was evaporated with a rotary vacuum evaporator, and the product obtained was heated at 60° C. Dry in a vacuum drying oven until constant weight to obtain a voltage-resistant monomer of formula (1) structure;

[0036] Where...

Embodiment 1

[0047] At normal temperature, normal pressure, under air atmosphere, the ethylene-1-butene copolymer resin (weight-average molecular weight 108000) that butene mass percent content is 6.7% carries out pre-irradiation with the beta ray of electron accelerator, pre-irradiation The dose is 20kGy.

[0048] Dissolve 0.2 mol of p-hydroxyacetophenone in 349 mL of 2-butanone, then add 0.2 mol of triethylamine, blow in nitrogen, keep stirring, and keep the reaction temperature at 0°C. Subsequently, 0.2 mol of methacryloyl chloride was dissolved in 149.5 mL of ether, and was added dropwise to the above mixed solution with a dropping funnel for 30 minutes. After the dropwise addition was completed, the reaction was continued for 3 hours. The reaction solution is filtered, washed with ether first, the filtrate is collected, then the filtrate containing the product is washed with 5wt% sodium hydroxide solution, and the filtrate containing the product is washed with deionized water, and fin...

Embodiment 2

[0058] At normal temperature, under normal pressure, under air atmosphere, the ethylene-1-octene copolymer resin (weight average molecular weight 136000) that octene mass percent content is 8.7% carries out pre-irradiation with the beta ray of electron accelerator, pre-irradiation The dose is 30kGy.

[0059] Dissolve 0.3 mol of p-hydroxyacetophenone in 340 mL of 2-butanone, then add 0.36 mol of triethylamine, blow in nitrogen, keep stirring, and keep the reaction temperature at 4°C. Subsequently, 0.44 mol of methacryloyl chloride was dissolved in 174.5 mL of ether, and was added dropwise to the above mixed solution with a dropping funnel for 25 minutes. After the dropwise addition was completed, the reaction was carried out for 4 hours. The reaction solution was filtered, first washed with ether, the filtrate was collected, then the filtrate containing the product was washed with 5wt% sodium hydroxide solution, and the filtrate containing the product was washed with deionized ...

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Abstract

The invention relates to long-acting high-voltage direct-current breakdown resistant polyethylene resin as well as a preparation method and application thereof, and belongs to the technical field of polyethylene resin. The problems that the existing polyethylene insulating material has inherent low breakdown field strength, and a voltage-resistant monomer is easy to migrate and separate out are solved. The long-acting high-voltage direct-current breakdown resistant polyethylene resin is prepared from the following raw materials in 100 parts by weight: 88.0-92.9 parts by weight of pre-irradiated polyethylene resin, 5-10 parts by weight of polyethylene grafted styrene polymer resin and 0.1-2.0 parts by weight of voltage-resistant monomer. The polyethylene resin voltage-resistant monomer is bonded to a polyethylene resin molecular chain, so migration and precipitation are limited, and the polyethylene resin voltage-resistant monomer has long-acting breakdown resistance; through a high-voltage direct-current breakdown experiment, the direct-current breakdown field strength is 397.8-497.6 kV / mm, and the direct-current breakdown field strength is 392.1-460.5 kV / mm after accelerated migration is carried out for 288 h at the temperature of 75 DEG C.

Description

technical field [0001] The invention belongs to the technical field of polyethylene resins, and in particular relates to a long-acting high-voltage DC breakdown-resistant polyethylene resin and its preparation method and application, in particular to the application of the polyethylene resin as an insulating material for high-voltage direct current transmission cables. Background technique [0002] Insulation materials for HVDC transmission cables are an important part of high-voltage transmission systems. At present, the low breakdown field strength of insulation materials is a key factor limiting the development of HVDC transmission systems. Improving the breakdown field strength of the insulating material can reduce the thickness of the insulating layer on the one hand, facilitate heat transfer in the cable, reduce the probability of thermal breakdown of the insulating material, and reduce the cost of the insulating cable; on the other hand, it can ensure a higher The tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06
CPCC08L51/06C08L2203/20C08L2205/025
Inventor 姚占海孙晓鹏杨方鸿
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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