High-voltage cable insulating material and preparation method and application thereof

Abstract

The invention provides a high-voltage cable insulating material and a preparation method and application thereof. The high-voltage cable insulating material comprises the components in parts by weight: 100 parts of low density polyethylene; 0.1 to 0.3 part, preferably 0.15 to 0.20 part, of an antioxidant; 1.0 to 2.0 parts, preferably 1.0 to 1.5 parts, of a cross-linking agent; 0.5 to 5.0 parts, preferably 0.5 to 2.0 parts, of a polybutadiene auxiliary agent; and 0.5-10.0 parts, preferably 0.5-5.0 parts, of a high polymer material additive. The high-voltage cable insulating material disclosed by the invention is excellent in comprehensive insulating property; the high-voltage cable insulating material disclosed by the invention has excellent breakdown strength stability, and meanwhile, an excellent water-tree-resistant effect is obtained, so that the long-term use stability of the material can be obviously improved. Furthermore, the preparation method of the high-voltage cable insulating material can greatly reduce the use amount of the cross-linking agent, has lower processing energy consumption, effectively reduces the cost, is suitable for industrial long-time stable production,and indirectly shortens the degassing time.

Description

technical field [0001] The invention relates to a high-voltage cable insulating material and a preparation method and application thereof, belonging to the technical field of insulating material processing. Background technique [0002] Most of the existing domestic insulation materials for power cables use low-density polyethylene (LDPE) as the base material, adding certain antioxidants and crosslinking agents. The temperature resistance level of non-cross-linked polyethylene is low, which cannot meet the long-term use requirements of high-voltage power cables at high temperatures for a long time. By adding a cross-linking agent to change the cross-linking of LDPE into cross-linked polyethylene (XLPE) to improve its Temperature rating. [0003] However, the commonly used insulating materials for high-voltage power cables have the following problems: the degassing time of cross-linked polyethylene is too long, and if the degassing is insufficient, small molecule precipitate...

AI Technical Summary

Problems solved by technology

The temperature resistance level of non-cross-linked polyethylene is low, which cannot meet the long-term use requirements of high-voltage power cables at high temperatures for a long time. By adding a cross-linking agent to change the cross-linking of LDPE into cross-linked polyethylene (XLPE) to improve its Temperature class

[0003] However, the insulation materials of high-voltage power cables commonly used at present have the following problems: the degassing time of cross-linked polyethylene is too long.

At the same time, cross-linked polyethylene has poor water tree resistance, and the long-term service life of the cable is short

[0004] Patent document CN108623877A discloses an insulating material for high-voltage DC cables with low cross-linking agent content and high cross-linking degree. The method of reducing the content of cross-linking agent by adding a cross-linking agent effectively reduces thermal elongation, but it only The thermal elongation performance of the material is analyzed, other dielectric properties and conventional mechanical properties are not described

Images