Rubber composition with high dielectric constant and electric cable member

Abstract

The present invention provides one kind o high-dielectric constant rubber composition with raised dielectric constant and no-degraded insulation characteristic and power cable member. Into 100 weight portions of base material M10, over 300 weight portions, over 400 weight portions or over 500 weight portions of barium titanate material powder M11 is added to prepare high-dielectric constant rubber composition with dielectric constant over 10, 15 or 20. peroxide cross-linked high-dielectric constant rubber is heat treated to eliminate decomposed peroxide residue. Industrial level barium titanate material powder BT4 is washed with deionized water to eliminate deionized impurity and further inhibit the degradation in dielectric loss factor, insulation destroying voltage, insulation resistance and other insulation performance.

Description

technical field [0001] The present invention relates to high dielectric constant rubber composition and power cable components. technical background [0002] CV cables, which are widely used as power cables, have positions that require insulation at their connecting parts or ends, such as internal electrode processing parts, external semiconducting layer processing parts, stress cone fronts, or interface parts between cable cores and connecting parts. Therefore, for example, the insulating layer is formed by using rubber mold inlay, rubber tape winding, injecting epoxy resin, etc., but many of them are carried out by hand. [0003] The insulating layer formed by manual operation is prone to produce discontinuous special points such as tiny protrusions, foreign objects, pores, etc., on its interface. Since the electric field gradient in the insulating layer becomes extremely large near such special points, it is necessary to Effectively preventing insulation breakdown requir...

AI Technical Summary

Problems solved by technology

[0005] However, once the conductive filler is filled, conductive particle chains will be formed, and the high dielectric constant rubber polymer has a large polarity, and the dielectric loss factor decreases, resulting in a decrease in insulation breakdown voltage or insulation resistance, so there is a problem in either case The problem of significantly reduced insulation

[0006] And although some people try to fill the rubber composition with fillers with higher dielectric constants such as barium titanate or titanium oxide, in this case, only the filling amount of the filler is increased. Once the dielectric constant of the rubber composition is increased, the There will be a problem that the insulation will be significantly reduced

Images