Polyolefin nano composite insulation material with high direct-current breakdown strength and preparation method thereof

A technology of breakdown strength and nanocomposite, applied in the field of high-voltage electrical insulating material preparation, can solve problems such as reducing the breakdown strength of polymers, and achieve the effects of improving the DC breakdown strength, improving the interface bonding force, and improving the compatibility.

Inactive Publication Date: 2018-12-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the large amount of Joule heat generated by DC current can significantly reduce the breakdown strength of polymers

Method used

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  • Polyolefin nano composite insulation material with high direct-current breakdown strength and preparation method thereof
  • Polyolefin nano composite insulation material with high direct-current breakdown strength and preparation method thereof
  • Polyolefin nano composite insulation material with high direct-current breakdown strength and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] This embodiment relates to a polyolefin nanocomposite insulating material with high DC breakdown strength, the composite material is made of 98% by mass fraction of low-density polyethylene as a matrix and 2% by mass fraction of voltage stabilizer functionalized nanoparticles as Filling composition. The preparation process of the nanoparticles functionalized by the voltage stabilizer is as follows: figure 1 shown, prepared by the following steps:

[0051] A. Activation of the voltage stabilizer: select p-methoxydiphenyl ethanedione to disperse in hydrobromic acid and acetic acid solution (the volume ratio of hydrobromic acid to acetic acid is 5:1) for reaction, and the solid-to-liquid ratio is 1:20. Reflux reaction for 48h. Then the obtained hydroxylated voltage stabilizer was dissolved in dichloromethane, the solid-to-liquid ratio was 1:10, and the feeding ratio with methacryloyl chloride was 1:1, and reacted in an ice bath under nitrogen protection for 4 hours. The...

Embodiment 2

[0059] This embodiment relates to a polyolefin nanocomposite insulation material with high DC breakdown strength, the composite material is made of 99% mass fraction of isotactic polypropylene as a matrix and 1% mass fraction of voltage stabilizer functionalized nanoparticles as Filling composition. The preparation process of the nanoparticles functionalized by the voltage stabilizer is as follows: figure 1 shown, prepared by the following steps:

[0060] A. Activation of voltage stabilizer: Select 2-hydroxy-4-methoxy-9-thioxanthone to disperse in hydrobromic acid and acetic acid solution (hydrobromic acid-acetic acid volume ratio is 2.5:1) for reaction, solid-liquid ratio For 1:30, reflux reaction for 36h. Then the obtained hydroxylated voltage stabilizer was dissolved in dichloromethane, the solid-to-liquid ratio was 1:15, and the feeding ratio with methacryloyl chloride was 1:1, and reacted in an ice bath under nitrogen protection for 2 hours. The obtained product is dis...

Embodiment 3

[0068] This embodiment relates to a polyolefin nanocomposite insulating material with high DC breakdown strength, the composite material is made of 99.75% mass fraction of ethylene-propylene copolymer as a matrix and 0.25% mass fraction of voltage stabilizer functionalized nanoparticles as Filling composition. The preparation process of the nanoparticles functionalized by the voltage stabilizer is as follows: figure 1 shown, prepared by the following steps:

[0069] A. Activation of voltage stabilizer: Select 2-amino-4-methoxy-9-thioxanthone to disperse in hydrobromic acid and acetic acid solution (hydrobromic acid-acetic acid volume ratio is 2:1) for reaction, the solid-to-liquid ratio For 1:25, reflux reaction for 24h. Then the obtained hydroxylated voltage stabilizer was dissolved in dichloromethane, the solid-to-liquid ratio was 1:15, and the feeding ratio with methacryloyl chloride was 1:1, and reacted in an ice bath under nitrogen protection for 2 hours. The obtained ...

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Abstract

The invention discloses a polyolefin nano composite insulation material with high direct-current breakdown strength and a preparation method thereof. The material comprises 96-99.75% polyolefin dielectric substrate and 0.25-4% modified nano particle filler; the modified nano particle filler is voltage stabilizer functionalized nano particles. By clicking grafting voltage stabilizer which is formedon the surfaces of the nano particles as the filler, the direct-current breakdown strength of the composite material can be improved, wherein the voltage stabilizer can capture high energy electronsto consume the energy of the electrons to reduce electrical breakdown caused by the collision of the electrons and polymers, and the compatibility of the nano particles and polyolefin can be improved.The nano particles has the advantages of inhibiting the accumulation and injection of the migration of the voltage stabilizer and spatial charges. The obtained composite material has the advantages of high direct-current breakdown strength and high thermal stability, and the composite material is applied to the field of high voltage direct current cable insulation.

Description

technical field [0001] The invention belongs to the field of preparation of high-voltage electrical insulating materials, and relates to electrical insulating polyolefin dielectrics, in particular to a polyolefin nanocomposite insulating material with high DC breakdown strength and a preparation method thereof. Background technique [0002] Polyolefin dielectrics have low dielectric constant, low dielectric loss, high resistivity, high DC breakdown strength, excellent thermodynamic properties and excellent chemical resistance, and are widely used in the field of high-voltage electrical insulation. Under high DC electric field, high-energy electrons collide with polymer molecular chains to cause severe electrical aging. In addition, the large amount of Joule heating generated by DC current can significantly reduce the breakdown strength of polymers. Therefore, there is a need to improve the DC breakdown strength and thermal stability of polyolefin dielectrics, thereby increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/12C08L23/16C08K9/10C08K3/22C08K3/36
Inventor 黄兴溢高雅涵江平开
Owner SHANGHAI JIAO TONG UNIV
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