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Thermoplastic cable with modified polypropylene insulating layer

A polypropylene and insulating layer technology, applied in the electrical field, can solve the problem that cable products cannot meet the requirements of stable operation, and achieve the effect of small weight, wide application range and thin thickness

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 requirements of stable operation under high temperature and high field strength, and provide a thermoplastic cable with a modified polypropylene insulation layer

Method used

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  • Thermoplastic cable with modified polypropylene insulating layer
  • Thermoplastic cable with modified polypropylene insulating layer
  • Thermoplastic cable with modified polypropylene insulating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] 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 2.5g of lauroyl peroxide and 50g of vinyltriethoxysilane, stir and mix for 30min, swell at 40°C for 1 hour, raise the temperature to 90°C, and react for 4 hours. After the reaction was completed, nitrogen was purged,...

Embodiment 2

[0162] 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 0.9g of dibenzoyl peroxide and 20g of vinyltriethoxysilane, stir and mix for 60min, raise the temperature to 90°C, and react for 4 hours. After the reaction, purging with nitrogen gas and cooling down, the polypropyl...

Embodiment 3

[0165] 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 6.0g of lauroyl peroxide and 100g of vinyltriethoxysilane, stir and mix for 60min, swell at 60°C for 1 hour, raise the temperature to 90°C, and react for 4 hours. After the reaction, purging with nitrogen gas and cooling do...

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Abstract

The invention belongs to the electrical field, and relates to a thermoplastic cable with a modified polypropylene insulating layer. The cable comprises at least one conductor and at least one electrical insulation layer surrounding the conductor, wherein the electrical insulation layer is made of at least one silane grafted modified polypropylene material; the silane grafted modified polypropylene material comprises a structural unit derived from co-polypropylene and a structural unit derived from an alkenyl-containing silane monomer; and on the basis of the weight of the silane grafted modified polypropylene material, the content of a structural unit which is derived from an alkenyl-containing silane monomer and is in a grafted state in the silane grafted modified polypropylene material is 0.2-6 wt%. 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 thermoplastic cable with a modified polypropylene 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/44H01B7/02H01B7/17H01B7/22H01B7/28H01B7/295H01B7/42
CPCH01B3/441H01B7/02H01B7/17H01B7/295H01B7/2813H01B7/226H01B7/421Y02A30/14
Inventor 李琦袁浩宋文波何金良王宇韬胡军邵清周垚
Owner CHINA PETROLEUM & CHEM CORP
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