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Preparation method of low-temperature conductance coefficient crosslinked polyethylene insulating material

A technology of cross-linked polyethylene and low-density polyethylene, applied in the direction of organic insulators, plastic/resin/wax insulators, etc., can solve the problems of difficult industrial application of nanocomposite insulating materials and difficulty in ensuring the dispersion of nanoparticles, and achieve improvement Electric field distribution, improvement of conductance-temperature characteristics, effects of reducing by-products and impurities

Inactive Publication Date: 2019-05-21
TIANJIN UNIV
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Problems solved by technology

However, due to the difficulty in ensuring the dispersion of nanoparticles in XLPE insulation, it is difficult to realize the industrial application of nanocomposite insulation materials.

Method used

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  • Preparation method of low-temperature conductance coefficient crosslinked polyethylene insulating material
  • Preparation method of low-temperature conductance coefficient crosslinked polyethylene insulating material

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Embodiment Construction

[0016] The present invention will be further described below through specific embodiments and accompanying drawings. The embodiments of the present invention are for better understanding of the present invention by those skilled in the art, and do not limit the present invention in any way.

[0017] First, put the low-density polyethylene (LDPE) in a drying oven, set the temperature at 80°C, and dry for 48 hours to remove the moisture that may exist in the LDPE and ensure that the LDPE is clean and dry.

[0018] Next, add 0.1g of antioxidant 1010, 2g of dicumyl peroxide (DCP) and 0.3g of 4,4'-bisdimethylaminobenzil into a three-necked bottle, add xylene solvent, and stir ultrasonically for 30min to make it Fully dissolve and disperse; add 100g LDPE particles to the mixed solution, and stir in an oil bath at 110°C for 3 hours to obtain a LDPE mixed solution; pour the mixed solution into a glass mold, and dry it in an oven at a temperature of 70°C to remove xylene to obtain a L...

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Abstract

The invention discloses a preparation method of a low-temperature conductance coefficient crosslinked polyethylene insulating material. The preparation method comprises the following steps: firstly, drying low-density polyethylene for 48 hours to guarantee the LDPE to be clean and dry; secondly, adding the dry low-density polyethylene, an antioxidant, a crosslinking agent and 4,4'-bisdimethylaminobibenzoyl into a three-necked flask according to a mass ratio of 100:0.1:2:0.3, adding a dimethylbenzene solvent, and stirring in an oil bath with the temperature of 110 DEG C for 3 h to remove dimethylbenzene to obtain an LDPE mixture; and finally, pressing a test sample, and performing vacuum drying for 48 hours to completely discharge impurities generated in the crosslinking process of the testsample. By the preparation method, the temperature conductance characteristic of XLPE is significantly improved, which is of an important significance for the XLPE for high-voltage DC cables.

Description

technical field [0001] The invention relates to a preparation method of a cross-linked polyethylene insulating material for high-voltage direct current cables, in particular to a preparation method of a cross-linked polyethylene insulating material with low temperature conductivity. Background technique [0002] With the development of HVDC transmission technology, HVDC cables are more and more widely used in power systems. Cross-linked polyethylene (XLPE) materials are widely used as high-voltage DC cable insulation materials due to their excellent mechanical properties and insulation properties. However, during the operation of the high-voltage DC cable, due to the heating of the conductor, the temperature in the cable insulation layer is distributed in a gradient from the inside to the outside. The temperature inside the insulation layer is higher, and the temperature outside the insulation layer is lower. Under DC conditions, the electric field distribution in the cable...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/18C08K5/134C08J3/24H01B3/44
Inventor 杜伯学韩晨磊侯兆豪李进张庆超姜惠兰
Owner TIANJIN UNIV
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