Cable with thermoplastic insulating layer

An insulating layer, thermoplastic technology, used in insulated cables, organic insulators, plastic/resin/wax insulators, etc., can solve the problem that cable products cannot meet the requirements of stable operation, and achieve low weight, strong breakdown resistance, and thin thickness. Effect

Active Publication Date: 2021-10-29
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that existing cable products cannot meet the requirement

Method used

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  • Cable with thermoplastic insulating layer
  • Cable with thermoplastic insulating layer
  • Cable with thermoplastic insulating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] Select the basic copolymerized polypropylene powder with the following characteristics: comonomer ethylene content 18.1wt%, xylene soluble matter content 48.7wt%, soluble comonomer content 31.9wt%, soluble matter / copolymerized polypropylene The intrinsic viscosity ratio is 0.89, and the weight average molecular weight is 34.3×10 4 g / mol, at 230°C, MFR under 2.16kg load is 1.21g / 10min, Tm=143.4°C, breakdown field strength (90°C) is 236kV / mm, DC volume resistivity (90°C, 15kV / mm) It is 1.16E13Ω·m, and the fine powder smaller than 40 mesh is removed by sieving. Weigh 2.0kg of the above-mentioned basic copolymerized polypropylene powder, add it into a 10L reaction kettle with mechanical stirring, seal the reaction system, and replace oxygen with nitrogen. Add 2g of dibenzoyl peroxide and 100g of styrene, stir and mix for 60min, swell at 40°C for 4 hours, raise the temperature to 95°C, and react for 4 hours. After the reaction, the temperature was purged with nitrogen to o...

Embodiment 2

[0165] Select the basic copolymerized polypropylene powder with the following characteristics: comonomer ethylene content 14.7wt%, xylene soluble matter content 41.7wt%, soluble comonomer content 34.5wt%, soluble matter / copolymerized polypropylene The intrinsic viscosity ratio is 0.91, and the weight average molecular weight is 36.6×10 4 g / mol, at 230°C, MFR under 2.16kg load is 1.54g / 10min, Tm=164.9°C, breakdown field strength (90°C) is 248kV / mm, DC volume resistivity (90°C, 15kV / mm) It is 7.25E12Ω·m, and the fine powder smaller than 40 mesh is removed by sieving. Weigh 2.0kg of the above-mentioned basic copolymerized polypropylene powder, add it into a 10L reaction kettle with mechanical stirring, seal the reaction system, and replace oxygen with nitrogen. Add 2.8g of lauroyl peroxide and 150g of styrene, stir and mix for 60min, swell at 60°C for 2 hours, raise the temperature to 90°C, and react for 4 hours. After the reaction, the temperature was purged with nitrogen to o...

Embodiment 3

[0167] Select the basic copolymerized polypropylene powder with the following characteristics: comonomer ethylene content 20.1wt%, xylene soluble matter content 66.1wt%, soluble comonomer content 29.5wt%, soluble matter / copolymerized polypropylene The intrinsic viscosity ratio is 1.23, and the weight average molecular weight is 53.8×10 4 g / mol, MFR at 230°C, 2.16kg load is 0.51g / 10min, Tm=142.5°C, breakdown field strength (90°C) is 176kV / mm, DC volume resistivity (90°C, 15kV / mm) It is 5.63E12Ω·m, and the fine powder smaller than 40 mesh is removed by sieving. Weigh 2.0kg of the above-mentioned basic copolymerized polypropylene powder, add it into a 10L reaction kettle with mechanical stirring, seal the reaction system, and replace oxygen with nitrogen. Add 1.5g of lauroyl peroxide and 50g of styrene, stir and mix for 60min, swell at 60°C for 2 hours, raise the temperature to 85°C, and react for 4 hours. After the reaction, the temperature was purged with nitrogen to obtain t...

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Abstract

The invention belongs to the electrical field, and relates to a cable with a thermoplastic insulating layer. The cable comprises at least one conductor and at least one electric insulation layer surrounding the conductor, wherein the electrical insulation layer is made of at least one aromatic olefin grafted modified polypropylene material; the aromatic olefin grafted modified polypropylene material comprises a structural unit derived from co-polypropylene and a structural unit derived from a styrene monomer, based on the weight of the aromatic olefin grafted modified polypropylene material, the content of a structural unit which is derived from a styrene monomer and is in a grafted state in the aromatic olefin grafted modified polypropylene material is 0.5-14wt%. The cable provided by the invention has higher working temperature, and has the advantages of thinner electrical insulation layer thickness, better heat dissipation and lighter weight under the condition of ensuring the same voltage class and insulation level.

Description

technical field [0001] The invention belongs to the electrical field, and in particular relates to a cable with a thermoplastic insulating layer. Background technique [0002] At present, cross-linked polyethylene is generally used as the insulating material for high-voltage DC cables at home and abroad. The working temperature is generally 70 ° C, and the long-term working design field strength is about 12kV / mm. At present, with the further improvement of the operating voltage and transmission capacity of high-voltage DC cables, The operating environment of cable insulation has also become more stringent due to the further increase of temperature and electric field strength, which puts forward higher requirements on the performance of cable insulation materials, that is, it still has higher performance under higher temperature and electric field strength conditions. Strong insulating properties. However, the operating temperature of traditional cross-linked polyethylene ha...

Claims

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Application Information

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IPC IPC(8): H01B3/44H01B7/02H01B7/17H01B7/22H01B7/295H01B7/42
CPCH01B3/441H01B7/02H01B7/17H01B7/295H01B7/226H01B7/421Y02A30/14
Inventor 何金良袁浩宋文波李琦邵清胡军施红伟周垚
Owner CHINA PETROLEUM & CHEM CORP
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