Thermoplastic high voltage cable insulating material and preparation method thereof

A technology for high-voltage cables and insulating materials, applied in the direction of plastic/resin/wax insulators, insulators, organic insulators, etc., can solve the problems of breakdown strength drop, space charge accumulation, cable degassing, etc., to suppress space charge injection and improve Volume resistivity, effect of improving breakdown strength

Active Publication Date: 2017-03-29
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cable has several disadvantages
One is that the XLPE insulation is difficult to recycle after the service of the cable, causing great environmental pressure; the other is that the cross-linked by-products are likely to cause space charge accumulation under the DC electric field, which seriously affects the service life of the cable, making conventional XLPE Insulated power cables cannot be used in high-voltage direct current transmission occasions; third, degassing is required in the cable production process, the process is complex and the production environment is harsh
Due to the extremely high resistivity of polyolefin insulating materials, charges are easily accumulated after injection, resulting in localized electric field concentration or distortion, resulting in a significant drop in breakdown strength
Adding inorganic nanoparticles to polyolefin insulation can suppress space charge injection, however, since most inorganic nanoparticles are incompatible with the polymer matrix, they are easily agglomerated in polyolefin, resulting in a significant decrease in the breakdown strength of the insulating material. Limiting the application of polyolefin insulation materials in high voltage cables

Method used

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  • Thermoplastic high voltage cable insulating material and preparation method thereof
  • Thermoplastic high voltage cable insulating material and preparation method thereof
  • Thermoplastic high voltage cable insulating material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment relates to a thermoplastic high-voltage cable insulation material, which is composed of 90 parts of isotactic polypropylene and 10 parts of ethylene-octene copolymer as the matrix, and 6 parts of 2-amino-3-(3,4 -Dihydroxyphenyl)propionic acid-1H,1H,2H,2H-perfluorodecyl modified barium titanate nanoparticles as filler composition. Wherein 2-amino-3-(3,4-dihydroxyphenyl)propionic acid-1H,1H,2H,2H-perfluorodecyl modified barium titanate nanoparticles were prepared by the following steps:

[0046] A. Dopamine with long-chain structure: 1H,1H,2H,2H-perfluorodecyl alcohol reacts with L-3,4-dihydroxyphenylalanine to obtain 2-amino-3-(3,4-dihydroxy phenyl)propionic acid-1H,1H,2H,2H-perfluorodecyl ester. The synthesis of this long-chain dopamine adopts the method in the literature (Manolakis, I. et al., Macromol. Rapid Commun. 2014, 35, 71-76.).

[0047] B. Dopamine-modified barium titanate nanoparticles with long-chain structure: 2-amino-3-(3,4-dihydroxyphenyl...

Embodiment 2

[0050] This embodiment relates to a thermoplastic high-voltage cable insulation material. The insulation material is made of 90 parts of isotactic polypropylene and 10 parts of propylene-ethylene copolymer as a matrix, and 5 parts of 2-amino-3-(3,4- Dihydroxyphenyl)decyl propionate modified strontium titanate nanoparticles as filler composition. The strontium titanate nanoparticles modified by decyl 2-amino-3-(3,4-dihydroxyphenyl)propionate are prepared through the following steps.

[0051] A. Dopamine with long chain structure: 1-decanol reacts with L-3,4-dihydroxyphenylalanine to obtain decyl 2-amino-3-(3,4-dihydroxyphenyl)propionate. The synthesis of this long-chain dopamine adopts the method in the literature (Manolakis, I. et al., Macromol. Rapid Commun. 2014, 35, 71-76.).

[0052] C. Dopamine-modified strontium titanate nanoparticles with long-chain structure: Dissolve decyl 2-amino-3-(3,4-dihydroxyphenyl)propionate in isopropanol, and at the same time, strontium titana...

Embodiment 3

[0055] This embodiment relates to a thermoplastic high-voltage cable insulating material, which is composed of 100 parts of isotactic polypropylene as a matrix and 4 parts of 2-amino-3-(3,4-dihydroxyphenyl)propionic acid-1H , 1H, 2H, 2H-perfluorodecyl ester modified magnesium oxide nanoparticles as filler composition. The preparation steps of magnesium oxide nanoparticles modified with decyl 2-amino-3-(3,4-dihydroxyphenyl)propionate are the same as those in Example 2, except that the nanoparticles used are magnesium oxide.

[0056] This embodiment also relates to a preparation method of a thermoplastic high-voltage cable insulating material, which comprises 100 parts of isotactic polypropylene, 4 parts of dopamine-modified magnesium oxide nanoparticles, 0.1 part of antioxidant 1010 and 0.1 part The antioxidant 168 was added to the internal mixer, and kneaded at 200°C for 8 minutes to obtain a thermoplastic high-voltage cable insulation material.

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Abstract

The invention discloses a thermoplastic high voltage cable insulating material and a preparation method thereof. The insulating material comprises the following components in parts by weight: 100 parts of polyolefin resin, 0.1 to 6 parts of dopamine modified nano particles, and 0.1 to 0.5 part of antioxidant, wherein the dopamine has been modified, and the nano particles are inorganic. Dopamine with a long chain structure is grafted on the nano particles to modify nano particles, the dispersing property of nano particles is improved by the dopamine, at the same time, the thermal stability of the thermoplastic cable insulating material is improved, and the injection of space charges is obviously inhibited. The prepared thermoplastic high voltage cable insulating material has excellent mechanical properties, thermal properties, and insulating performance, is easy to process, and can be applied to cable insulation, especially high voltage DC cable insulation.

Description

technical field [0001] The invention belongs to the technical field of cable insulating material preparation, and in particular relates to a thermoplastic high-voltage cable insulating material and a preparation method thereof. Background technique [0002] Extruded insulating plastic power cables have the advantages of small size, light weight, easy laying, and easy maintenance, and are widely used in power transmission and distribution projects. However, the vast majority of extruded insulating plastic cables currently used are XLPE insulated cables. This cable has several disadvantages. One is that the XLPE insulation is difficult to recycle after the service of the cable, causing great environmental pressure; the other is that the by-products of cross-linking are likely to cause space charge accumulation under a DC electric field, which seriously affects the service life of the cable, making conventional XLPE Insulated power cables cannot be used in high-voltage direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/08C08K9/04C08K3/24C08K3/22C08K3/36C08K3/38H01B3/44
CPCC08K3/22C08K3/36C08K9/04C08K2003/222C08K2003/2227C08K2003/2244C08K2003/385C08K2201/011C08L23/12C08L2201/08C08L2203/202H01B3/441C08L23/14C08K3/24C08L23/0815C08K2003/2296
Inventor 黄兴溢江平开
Owner SHANGHAI JIAO TONG UNIV
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