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High-performance polypropylene cable

A polypropylene, high-performance technology, applied in the field of high-performance polypropylene cables, can solve the problems that cable products cannot meet the requirements of stable operation, and achieve the effects of small weight, high volume resistivity, and wide application range

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 this invention is to overcome the problem that existing cable products cannot meet the requirements of stable operation under high temperature and high field strength, and provide a high-performance polypropylene cable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] 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 a solution of 1.3g of dibenzoyl peroxide, 10g of maleic anhydride and 40g of styrene, stir and mix for 30min, swell at 40°C for 2 hours, heat up to 90°C, and react for 4 hours. After the reaction, the temperature was...

Embodiment 2

[0180] 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 a solution of 0.6g dibenzoyl peroxide, 5g maleic anhydride and 22g styrene, stir and mix for 30min, swell at 40°C for 3 hours, raise the temperature to 95°C, and react for 4 hours. After the reaction was completed, n...

Embodiment 3

[0183] 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 4g / 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 a solution of 2.6g of dibenzoyl peroxide, 12g of maleic anhydride and 88g of styrene, stir and mix for 30min, swell at 40°C for 2 hours, heat up to 90°C, and react for 4 hours. After the reaction was completed, nitrogen was...

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Abstract

The invention belongs to the electrical field, and relates to a high-performance polypropylene cable. 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 polypropylene graft containing anhydride groups; the polypropylene graft containing the anhydride group comprises a structural unit derived from co-polypropylene, a structural unit derived from an anhydride monomer and a structural unit derived from an alkenyl-containing polymeric monomer. 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 high-performance polypropylene cable. 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 has reach...

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 李琦邵清袁浩何金良胡军宋文波周垚张琦王宇韬
Owner CHINA PETROLEUM & CHEM CORP
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