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Polypropylene-based thermoplastic shielding material for cable, and preparation method thereof

A polypropylene-based, thermoplastic technology, which is applied in the field of polypropylene-based thermoplastic cable shielding materials and its preparation, can solve the problems of decreased mechanical properties and surface smoothness, difficulty in recycling, and great environmental hazards, and achieves improved electrical conductivity and mechanical properties. Performance, avoiding the decline of mechanical properties, and improving the effect of mechanical properties

Pending Publication Date: 2021-01-29
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the medium and high voltage cables widely used are cross-linked polyethylene (XLPE) cables, which are made by cross-linking process, and many harmful cross-linking by-products are produced in the manufacturing process. It is difficult to recycle and can only be disposed of by landfill and incineration, which is more harmful to the environment. The development of thermoplastic non-crosslinked cables requires green development. Polypropylene (PP) materials have excellent electrical properties and heat resistance. Polypropylene ( PP) as the matrix resin, thermoplastic cables currently have the potential to replace XLPE cables. At present, there are many researches on thermoplastic polypropylene cable insulation materials. Domestic companies have developed polypropylene insulation materials, and the matching semi-conductive shielding materials are currently researched more. Usually shielding material needs to be filled with more than 30wt% conductive carbon black in order to achieve semi-conductive effect and obtain a lower positive temperature coefficient of resistivity. However, polypropylene material is non-polar, with high processing viscosity and high crystallinity. It has poor compatibility with conductive filler carbon black, and high carbon black filling will reduce the processing performance, mechanical properties and surface smoothness. Therefore, how to balance the conductivity, mechanical properties and processing properties of non-crosslinked cable shielding materials becomes a problem. The main problems in shielding materials for non-cross-linked cables at present

Method used

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  • Polypropylene-based thermoplastic shielding material for cable, and preparation method thereof
  • Polypropylene-based thermoplastic shielding material for cable, and preparation method thereof

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Embodiment 1

[0029] As a shielding compound for polypropylene-based thermoplastic cables according to an embodiment of the present invention, the shielding compound for polypropylene-based thermoplastic cables includes the following components in parts by weight: 100 parts of ethylene propylene block copolymerized polypropylene, 5 parts of conductive Carbon black, 1 part of highly conductive graphene, 1 part of coupling agent A172 (vinyl tri(β-methoxyethoxy) silane), 0.5 part of antioxidant 300, 1 part of lubricant silicone oil, 1 part of anti-adhesive agent ethylene bis stearamide (EBS), the ethylene segment mass fraction in the ethylene propylene block copolymerized polypropylene is 20%, and the average particle diameter of the conductive carbon black is 20~80nm, so The BET specific surface area of ​​the conductive carbon black is 150-500m 2 / g, the number of layers of the highly conductive graphene is 1 to 6 layers, the average layer thickness of the highly conductive graphene is 1 to 5...

Embodiment 2

[0035] As a shielding compound for polypropylene-based thermoplastic cables according to an embodiment of the present invention, the shielding compound for polypropylene-based thermoplastic cables includes the following components in parts by weight: 100 parts of ethylene propylene block copolymerized polypropylene, 7.5 parts of conductive Carbon black, 0.5 parts of highly conductive graphene, 1 part of coupling agent KH550 (γ-aminopropyltriethoxysilane), 0.5 parts of antioxidant 1010, 1 part of lubricant liquid paraffin, 1 part of Anti-adhesive barium stearate, the ethylene segment mass fraction in the ethylene propylene block copolymerized polypropylene is 20%, the average particle diameter of the conductive carbon black is 20-80nm, and the BET specific surface area of ​​the conductive carbon black is 150-500m 2 / g, the number of layers of the highly conductive graphene is 1 to 6 layers, the average layer thickness of the highly conductive graphene is 1 to 5 nm, and the BET ...

Embodiment 3

[0037] As a shielding compound for polypropylene-based thermoplastic cables according to an embodiment of the present invention, the shielding compound for polypropylene-based thermoplastic cables includes the following components in parts by weight: 100 parts of ethylene propylene block copolymerized polypropylene, 10 parts of conductive Carbon black, 0.5 parts of highly conductive graphene, 1 part of coupling agent KH550 (γ-aminopropyltriethoxysilane), 0.5 parts of antioxidant 1010, 1 part of lubricant liquid paraffin, 1 part of Anti-adhesive barium stearate, the ethylene segment mass fraction in the ethylene propylene block copolymerized polypropylene is 20%, the average particle diameter of the conductive carbon black is 20-80nm, and the BET specific surface area of ​​the conductive carbon black is 150-500m 2 / g, the number of layers of the highly conductive graphene is 1 to 6 layers, the average layer thickness of the highly conductive graphene is 1 to 5 nm, and the BET s...

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Abstract

The invention provides a polypropylene-based thermoplastic shielding material for a cable and a preparation method of the shielding material. The shielding material comprises the following componentsin parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 3-20 parts of conductive carbon black, 0.5-1.5 parts of high-conductivity graphene, 0.5-1.5 parts of a coupling agentand 1.4-4.5 parts of an auxiliary agent, wherein the auxiliary agent comprises an antioxidant, a lubricant and an anti-bonding agent; and the mass fraction of ethylene fragments in the ethylene-propylene block copolymer polypropylene is 5%-30%. According to the shielding material in the invention, the problem that mechanical properties are reduced due to the fact that high-content conductive carbon black needs to be added for improving the conductivity of a conventional polypropylene-based thermoplastic shielding material for the cable is solved, and the polypropylene-based thermoplastic shielding material for the cable in the invention has excellent conductivity and mechanical properties, and still has excellent conductivity and mechanical properties under a high-temperature condition through cooperation among the ethylene-propylene block copolymer polypropylene, the conductive carbon black and the high-conductivity graphene.

Description

technical field [0001] The invention relates to the field of cable protective materials, in particular to a polypropylene-based thermoplastic cable shielding material and a preparation method thereof. Background technique [0002] At present, the medium and high voltage cables widely used are cross-linked polyethylene (XLPE) cables, which are made by cross-linking process, and many harmful cross-linking by-products are produced in the manufacturing process. It is difficult to recycle, and it can only be disposed of by landfill and incineration. The environmental hazards are relatively large. The development of thermoplastic non-crosslinked cables requires green development. Polypropylene (PP) materials have excellent electrical properties and heat resistance. Polypropylene ( PP) as the matrix resin, thermoplastic cables currently have the potential to replace XLPE cables. At present, there are many researches on thermoplastic polypropylene cable insulation materials. Domesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08L83/04C08K13/02C08K3/04C08K5/20C08K5/098
CPCC08L53/00C08L2203/202C08K2201/017C08K2201/001C08K2201/005C08L83/04C08K13/02C08K3/04C08K3/042C08K5/20C08L91/06C08K5/098
Inventor 侯帅傅明利黎小林惠宝军朱闻博薛志刚徐曼陈俊黄慧红顾乐张逸凡冯宾
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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