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Crosslinked polyethylene cable insulating material containing compounding agent with high electrical resistance and preparation method thereof

A cross-linked polyethylene, cable insulation technology, applied in insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problem of long-term compatibility of high-efficiency polymers in a wide temperature range of voltage stabilizers, etc. The effect of dense electron-withdrawing space action range, improved resistance to electric tree branches, and increased action space range

Pending Publication Date: 2021-12-03
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the existing voltage stabilizer cannot take into account the wide temperature range high efficiency of the voltage stabilizer and its long-term compatibility with the polymer when improving the withstand voltage performance of the cross-linked polyethylene insulating material, and to comprehensively improve the cross-linked polyethylene difference. In order to solve the problems of electric resistance branch performance and breakdown performance at high temperature, a cross-linked polyethylene cable insulation material containing high electric resistance compounding agent and its preparation method are provided

Method used

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  • Crosslinked polyethylene cable insulating material containing compounding agent with high electrical resistance and preparation method thereof
  • Crosslinked polyethylene cable insulating material containing compounding agent with high electrical resistance and preparation method thereof
  • Crosslinked polyethylene cable insulating material containing compounding agent with high electrical resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 40g of low-density polyethylene into the internal mixer, melt at 110°C, and rotate at a speed of 50r / min, add 0.32g of 4-propenyloxy-2-hydroxybenzophenone after it melts, at the same temperature and Mix for 5 minutes at a rotating speed, then add 0.8g of dicumyl peroxide and 0.12g of antioxidant 1035, continue mixing for 3 minutes at the same temperature and rotating speed, and carry out melt blending. After obtaining the blend, put it into The mold is hot-pressed in a flat vulcanizer at 110°C and 15MPa, and then crosslinked in a flat vulcanizer at 175°C and 15MPa for 30 minutes to complete the crosslinking reaction of crosslinked polyethylene and the grafting of aromatic ketone compounds containing chelating rings. reaction to obtain a chelating ring aromatic ketone grafted cross-linked polyethylene insulating material. Specific process such as figure 1 As shown, the initiator dicumyl peroxide decomposes at high temperature to produce primary free radicals, and th...

Embodiment 2

[0038] Put 10kg of low-density polyethylene into the double-cone rotary vacuum dryer, set the internal temperature of the dryer to 90°C, and the rotation speed to 50r / min, preheat the low-density polyethylene particles for 10min, add 30g of antioxidant 1076, 40g of 4-propylene Oxy-2-hydroxybenzophenone and 180g of dicumyl peroxide are stirred evenly and heated to 90°C until the three powders are completely melted into a solution. After the solution is stirred evenly, spray it into a double-cone rotary vacuum dryer. Rotate, heat and soak for 4 hours under 0.1MPa vacuum, put the soaked granules into the parallel twin-screw extruder, extrude and granulate at 110 degrees Celsius, put the obtained granules into the mold and heat them in a flat vulcanizer at 110°C and 15MPa Compression molding, and then cross-linking in a flat vulcanizing machine at 175°C and 15MPa for 30 minutes to complete the cross-linking reaction of cross-linked polyethylene and the grafting reaction of aromatic...

Embodiment 3

[0040] Put 100kg of low-density polyethylene into the double-cone rotary vacuum dryer, set the internal temperature of the dryer to 80°C, and the rotation speed to 50r / min, preheat the low-density polyethylene particles for 10min, add 300g of antioxidant 1035, 200g of 2-acrylic acid 2-(4-benzoyl-3-hydroxyphenoxy)ethyl ester, 200g 2-propenyl-4,6-bibenzoylresorcinol, 1800g dicumyl peroxide were stirred evenly and heated to 90°C until the three powders are completely melted into a solution. Stir the solution evenly, spray it into a double-cone rotary vacuum dryer, rotate and heat it for 8 hours under a vacuum of -0.1MPa, and put the soaked particles into a single-screw extruder. Extrude and granulate at 110°C, and use the obtained granules as insulating material granules to extrude and cover the cable conductor cores with a three-layer co-extrusion extruder to make insulating cores with inner and outer shielding layers, and then the insulating cores Pull into the high-temperature...

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Abstract

The invention discloses a crosslinked polyethylene cable insulating material containing a compounding agent with high electrical resistance and a preparation method thereof, belongs to the technical field of electrical materials, and solves the problems that when an existing voltage stabilizer improves the voltage resistance of the crosslinked polyethylene insulating material, the wide-temperature-range high efficiency and long-term compatibility of the voltage stabilizer cannot be considered at the same time, and the electrical tree resistance and breakdown resistance of crosslinked polyethylene at different temperatures cannot be comprehensively improved. The voltage stabilizer used in the invention comprises a six-membered chelate ring structure composed of hydroxyl, carbonyl and a benzene ring, the grafting reaction of vinyl ensures the uniform and stable dispersion of the voltage stabilizer, and the voltage stabilizer forms a uniform and dense electron action space in a polymer due to a larger molecular structure and electron conjugate surface, and thus the electronic energy consumption effect of the chelate ring is fully exerted, and the electrical tree resistance and the breakdown strength of the material in the whole use temperature range of a cable insulation layer are remarkably improved.

Description

technical field [0001] The invention relates to a cross-linked polyethylene cable insulating material containing a compounding agent with high electrical resistance performance and a preparation method thereof, belonging to the technical field of electrical materials. Background technique [0002] The electrical resistance of cross-linked polyethylene mainly includes three aspects: electrical tree branch resistance, electrical aging resistance and breakdown strength. The two most commonly used methods to improve the electric strength of cross-linked polyethylene insulating materials are: 1. to improve the purity of the material; 2. to modify the material. Improving the purity of the insulating layer can greatly reduce the negative impact of impurities in the insulating layer on the electric strength, but the purification process of cable materials and cable manufacturing has made great progress, and the electric strength of cross-linked polyethylene has a limit . Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08K5/134C08K5/375C08F255/02C08F216/14C08F220/30C08F220/20H01B3/30H01B3/44
CPCC08K5/1345C08K5/375C08F255/02H01B3/307H01B3/441C08L2312/00C08L2203/202C08L51/06C08F216/1416C08F220/303C08F220/20
Inventor 李春阳赵洪张城城韩宝忠王暄
Owner HARBIN UNIV OF SCI & TECH
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