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Crosslinked polyethylene cable insulating material and preparation method thereof

A cross-linked polyethylene and cable insulation technology, which is applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problems of reducing the effect of voltage stabilizers, changes in the electrical conductivity of cable insulation, and changes in the structure of insulating materials. Achieve the effect of improving partial discharge resistance and electric tree branching ability, good electric resistance performance and high insulation resistance

Inactive Publication Date: 2020-02-14
宋晓明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese Patent Publication No. CN108623877 discloses an insulating material for high-voltage DC cables and a preparation method thereof. The insulating material includes the following components in parts by mass: polyethylene resin, antioxidant, crosslinking agent and crosslinking assistant Compared with the traditional XLPE insulating material, the prepared insulating material is added with a cross-linking agent, which reduces the content of the cross-linking agent while maintaining the same degree of cross-linking, prolongs the plasticizing time, and improves the insulation performance of the cable. However, the high-voltage DC cable The temperature gradient generated during operation will lead to a change in the electrical conductivity of the cable insulation, which in turn will lead to an "reversal" of the electric field inside the cable insulation layer, causing changes in the internal structure of the insulation material and accelerating the aging of the insulation material
Chinese Patent Publication No. CN109096572 discloses a polyolefin nanocomposite insulating material with high DC breakdown strength and its preparation method, wherein the modified nanoparticle filler is a nanoparticle surface-modified voltage stabilizer molecule, and the nanoparticle surface is grafted with a voltage stabilizer It can not only reduce the electrical breakdown caused by the collision between electrons and polymers, but also improve the compatibility between inorganic nanoparticles and polyolefins. However, the voltage stabilizers currently used are generally polycyclic compounds and benzophenone derivatives. And phenolic compounds, such substances are easy to degrade and react with additives during the extrusion and crosslinking of cable materials, thereby reducing the effect of voltage stabilizers

Method used

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  • Crosslinked polyethylene cable insulating material and preparation method thereof
  • Crosslinked polyethylene cable insulating material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of modified nano-alumina comprises the following steps:

[0032] Mix ethanol and water at a volume ratio of 1:0.2 to obtain a mixed solvent, add vinyl silane coupling agent KH-171 into the mixed solvent and stir to dissolve, the mass ratio of vinyl silane coupling agent KH-171 to the mixed solvent is 1:60, adjust the pH of the system to 5.2, raise the temperature to 55°C, stir and hydrolyze for 40 minutes to obtain a vinyl silane coupling agent solution, add nano-alumina to the vinyl silane coupling agent solution, nano-alumina and vinyl silane coupling The mass ratio of the joint agent KH-171 is 1:3, stirred at 45°C for 2 hours, filtered, washed with alcohol, and dried in an oven at 55°C for 1 hour to obtain modified nano-alumina.

[0033] The preparation method of high pressure stabilizer composite particle comprises the following steps:

[0034] Get chitosan according to mass volume ratio 1g / 80mL, add mass concentration in the acetic acid aque...

Embodiment 2

[0042] The preparation method of modified nano-alumina comprises the following steps:

[0043] Mix ethanol and water at a volume ratio of 1:0.1 to obtain a mixed solvent, add vinyl silane coupling agent KH-171 into the mixed solvent and stir to dissolve, the mass ratio of vinyl silane coupling agent KH-171 to the mixed solvent is 1:60, adjust the pH of the system to 5.2, raise the temperature to 55°C, stir and hydrolyze for 40 minutes to obtain a vinyl silane coupling agent solution, add nano-alumina to the vinyl silane coupling agent solution, nano-alumina and vinyl silane coupling The mass ratio of the joint agent KH-171 is 1:1, stirred and reacted at a constant temperature of 50°C for 1h, filtered, washed with alcohol, and dried in an oven at 55°C for 1h to obtain modified nano-alumina.

[0044] The preparation method of high pressure stabilizer composite particle comprises the following steps:

[0045] Get chitosan according to mass volume ratio 1g / 80mL, add mass concentr...

Embodiment 3

[0053] The preparation method of modified nano-alumina comprises the following steps:

[0054] Mix ethanol and water at a volume ratio of 1:0.1 to obtain a mixed solvent, add vinyl silane coupling agent KH-171 into the mixed solvent and stir to dissolve, the mass ratio of vinyl silane coupling agent KH-171 to the mixed solvent is 1:60, adjust the pH of the system to 5.5, raise the temperature to 60°C, stir and hydrolyze for 30 minutes to obtain a vinyl silane coupling agent solution, add nano-alumina to the vinyl silane coupling agent solution, and nano-alumina and vinyl silane couple The mass ratio of the joint agent KH-171 is 1:2, stirred and reacted at 48°C for 1.5h, filtered, washed with alcohol, and dried in an oven at 55°C for 1h to obtain modified nano-alumina.

[0055] The preparation method of high pressure stabilizer composite particle comprises the following steps:

[0056] Get chitosan according to mass volume ratio 1g / 80mL, add mass concentration in the acetic ac...

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Abstract

The invention relates to the technical field of cables, and discloses a crosslinked polyethylene cable insulating material and a preparation method thereof. The crosslinked polyethylene cable insulating material is prepared from the following components in parts by weight: 80-90 parts of low-density polyethylene, 2-3 parts of dicumyl peroxide, 0.5-1.5 parts of modified nanometer aluminum oxide, and 1-2 parts of high-voltage stabilizer composite particles. The prepared crosslinked polyethylene cable insulating material has the excellent conductivity temperature characteristic, 'inversion' of anelectric field does not occur in a cable insulating layer, in addition, a voltage stabilizer is not degraded and does not reach with an auxiliary in the cable material extruding and crosslinking processes, thus the action effect of the voltage stabilizer is improved, the local discharge and electric tree capacity of the polyethylene insulating material is improved, and thus the direct-current breakdown strength of the material is improved.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a cross-linked polyethylene cable insulating material and a preparation method thereof. Background technique [0002] The development of electric energy is related to the national economy, the people's livelihood and national security. With the continuous and rapid development of my country's economy and society, the demand for electric power has also entered a period of rapid growth. Due to the reverse distribution of energy bases and power load centers in my country, higher requirements are put forward for the construction of power systems. It is necessary to develop ultra-high voltage, long-distance, large-capacity, and low-loss ionization networks to hinder national development plans. HVDC transmission technology is an effective way to solve this problem. As an important part of high-voltage direct current transmission, high-voltage direct current cable transmission has the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L5/08C08K13/06C08K9/06C08K3/22C08K5/13H01B3/44
CPCC08K2003/2227C08K2201/011C08L23/06C08L2203/202C08L2207/066C08L2312/00H01B3/441C08L5/08C08K13/06C08K9/06C08K3/22C08K5/13
Inventor 宋晓明
Owner 宋晓明
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