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Nanocomposite cross-linked polyethylene insulating material with high DC breakdown field strength and preparation method thereof

A cross-linked polyethylene and nano-composite technology is applied in the field of insulating materials for DC cables, which can solve the problems of DC breakdown field strength of cross-linked polyethylene insulating materials for DC cables that have not yet been seen, and achieve the improvement of DC breakdown field strength, Effect of high DC breakdown field strength

Active Publication Date: 2019-10-11
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the use of nano-boron nitride to improve the DC breakdown field strength of XLPE insulation materials for DC cables

Method used

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  • Nanocomposite cross-linked polyethylene insulating material with high DC breakdown field strength and preparation method thereof
  • Nanocomposite cross-linked polyethylene insulating material with high DC breakdown field strength and preparation method thereof
  • Nanocomposite cross-linked polyethylene insulating material with high DC breakdown field strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Weigh 100 parts of nano-boron nitride (for example, hexagonal boron nitride) particles by mass and dissolve them in acetone, then add 3 parts of hexadecyltrimethoxysilane (silane coupling agent), and vibrate ultrasonically at 60°C 20min. Then, put the solution in an oven at 80° C. to evaporate and dry the particles to obtain nano boron nitride particles (average particle diameter: 50 nm) whose surface has been modified by a silane coupling agent. Among them, the ultrasonic oscillation method can prevent the aggregation of nanoparticles.

[0028] Step 2, take by weighing 100 parts of low-density polyethylene, 0.3 parts of thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (antioxidant) and 0.5 parts nanoparticles. The nano-particles are nano boron nitride particles whose surface has been modified by a silane coupling agent. The density of the low density polyethylene is 0.900-0.925g / cm 3 .

[0029] Step 3. Add the low-density polyethylene we...

Embodiment 2

[0033] Step 1. Dissolve 100 parts of nano-boron nitride particles in acetone by weight, then add 1.5 parts of γ-methacryloxypropyltrimethoxysilane (silane coupling agent), and vibrate ultrasonically at 60° C. for 10 minutes. Then, put the solution in an oven at 75° C. to evaporate and dry the particles to obtain nano boron nitride particles (average particle diameter: 50 nm) whose surface has been modified by a silane coupling agent. Among them, the ultrasonic oscillation method can prevent the aggregation of nanoparticles.

[0034] Step 2. Weigh 100 parts of low-density polyethylene, 0.5 parts of 4,4'-thiobis(6-tert-butyl-3-methylphenol) (antioxidant) and 1.5 parts of nanoparticles according to the mass. The nano-particles are nano boron nitride particles whose surface has been modified by a silane coupling agent. The density of the low density polyethylene is 0.900-0.925g / cm 3 .

[0035] Step 3. Add the low-density polyethylene weighed in step 2 into a twin-screw kneader ...

Embodiment 3

[0039] Step 1. Weigh 100 parts of nano-boron nitride particles and dissolve them in acetone, then add 3 parts of n-octyltrimethoxysilane (silane coupling agent), and vibrate ultrasonically at 20°C for 20 minutes. Then, put the solution in an oven at 70° C. to evaporate and dry the particles to obtain nano boron nitride particles (average particle diameter: 50 nm) whose surface has been modified by a silane coupling agent. Among them, the ultrasonic oscillation method can prevent the aggregation of nanoparticles.

[0040] Step 2, take by weighing 100 parts of low-density polyethylene, 0.5 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester (antioxidant) and 2 parts of nano particle. The nano-particles are nano boron nitride particles whose surface has been modified by a silane coupling agent. The density of the low density polyethylene is 0.900-0.925g / cm 3 .

[0041] Step 3. Add the low-density polyethylene weighed in step 2 into a twin-...

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Abstract

The invention provides a nano composite crosslinked polyethylene insulating material with high direct current breakdown field strength and a preparation method of the nano composite crosslinked polyethylene insulating material. The insulating material is prepared from the following components in parts by mass: 100 parts of low density polyethylene, 0.1 to 3 parts of nano boron nitride particles, 1 to 2.5 parts of a crosslinking agent and 0.1 to 0.5 part of an antioxidant. The insulating material prepared based on the preparation method can be used as an insulating material for a direct current cable; compared with crosslinked polyethylene without the nano boron nitride particles, the nano composite crosslinked polyethylene insulating material has the advantage that the direct current breakdown field strength is obviously improved; at 20 DEG C, 70 DEG C and 90 DEG C, the direct current breakdown field strength is improved by 27.5 percent, 14.2 percent and 26.5 percent respectively; the nano composite crosslinked polyethylene insulating material is relatively high in direct current breakdown field strength.

Description

technical field [0001] The invention relates to an insulating material for DC cables, in particular to a nano-boron nitride-doped cross-linked polyethylene composite material with high DC breakdown field strength and a preparation method thereof. Background technique [0002] In recent years, DC transmission has developed rapidly, and many ±800kV UHV, ±660kV and ±500kV EHV overhead transmission lines have been constructed using conventional DC transmission technology. Cables, etc. are used as transmission lines, which require huge investment and have a great impact on the environment. Flexible DC transmission technology generally uses XLPE insulated cables, which have excellent electrical properties, high operating temperature, and no risk of oil leakage. However, the space charge accumulation problem of XLPE cables under DC field is a key technical problem restricting its application to high-voltage DC. The existence of space charge will lead to local field strength disto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K13/06C08K9/06C08K3/38C08K5/14C08J3/24
Inventor 王诗航陈铮铮陈培星李建英赵健康蒙绍新欧阳本红
Owner XI AN JIAOTONG UNIV