Crosslinked polyethylene electric-insulation material and preparation method thereof

Abstract

The invention relates to the field of electric-insulation materials, particularly a crosslinked polyethylene electric-insulation material and a preparation method thereof. The invention aims to solve the problems of low breakdown voltage and high aging tendency in the existing crosslinked polyethylene electric-insulation material, and provides a crosslinked polyethylene electric-insulation material with favorable breakdown characteristics and aging resistance. The preparation method comprises the following steps: proportionally taking 100 parts of low-density polyethylene, EVA (ethylene-vinyl acetate), nano graphite, PP (polypropylene), a crosslinking agent DCP (dicumyl peroxide), an antioxidant 300, an antioxidant 1010, an antioxidant DLTP (dilauryl thiodipropionate), an antioxidant 1024 and a fluororubber master batch, mixing, melting, carrying out crosslinking reaction, and drying to obtain the crosslinked polyethylene electric-insulation material. The crosslinked polyethylene material has excellent breakdown characteristics and favorable thermal conductivity, and is beneficial to lowering the working temperature of the electric-insulation material and prolonging the service life of the material. The crosslinked polyethylene electric-insulation material is suitable for manufacturing high-voltage direct-current transmission line cables.

Description

technical field

[0001] The invention relates to the field of insulating materials, in particular to a cross-linked polyethylene insulating material and a preparation method thereof. Background technique

[0002] High-voltage DC transmission lines have been widely used in long-distance power transmission due to their excellent electrical properties, while DC power cable insulation has high working electric field strength, thin insulation thickness, small cable outer diameter, light weight, large carrying capacity, and no AC Therefore, as an indispensable part of the DC transmission system, the DC high-voltage transmission cable is an important topic in the high-voltage transmission. In the early stage of application of high-voltage DC cables, impregnated paper insulated cables and oil-filled cables are mainly used. The disadvantages are complex manufacturing process, high cost and difficult maintenance. In 1999, cross-linked polyethylene (XLPE) insulated high-voltage DC cabl...

Examples

specific Embodiment approach 1

[0015] Embodiment 1: The cross-linked polyethylene insulating material of this embodiment is prepared from the following components in terms of mass percentage:

[0016]

specific Embodiment approach 2

[0017] Specific implementation mode two: the preparation method of the cross-linked polyethylene insulating material of the present implementation mode, the specific steps are:

[0018] Step 1. Take 100 parts of XLPE, EVA, nano-graphite, PP, crosslinking agent DCP, antioxidant 300, antioxidant 1010, antioxidant DLTP, antioxidant 1024, and fluororubber masterbatch according to the proportion;

[0019] Step 2. Add XLPE, EVA, nano-graphite, PP, crosslinking agent DCP, antioxidant 300, antioxidant 1010, antioxidant DLTP, antioxidant 1024, and fluororubber masterbatch to the mixer and mix evenly;

[0020] Step 3, transfer the above materials into a closed mixer, and carry out melt blending at a temperature of 100-120°C;

[0021] Step 4, transfer the above materials into a flat vulcanizer, carry out a cross-linking reaction at 150-180° C., and obtain a cross-linked polyethylene product added with nano-graphite after 30-60 minutes;

[0022] Step 5. After cooling the product obtained...

technical field

[0001] The invention relates to the field of insulating materials, in particular to a cross-linked polyethylene insulating material and a preparation method thereof. Background technique

[0002] High-voltage DC transmission lines have been widely used in long-distance power transmission due to their excellent electrical properties, while DC power cable insulation has high working electric field strength, thin insulation thickness, small cable outer diameter, light weight, large carrying capacity, and no AC Therefore, as an indispensable part of the DC transmission system, the DC high-voltage transmission cable is an important topic in the high-voltage transmission. In the early stage of application of high-voltage DC cables, impregnated paper insulated cables and oil-filled cables are mainly used. The disadvantages are complex manufacturing process, high cost and difficult maintenance. In 1999, cross-linked polyethylene (XLPE) insulated high-voltage DC cabl...

Examples

specific Embodiment approach 1

[0015] Embodiment 1: The cross-linked polyethylene insulating material of this embodiment is prepared from the following components in terms of mass percentage:

[0016]

specific Embodiment approach 2

[0017] Specific implementation mode two: the preparation method of the cross-linked polyethylene insulating material of the present implementation mode, the specific steps are:

[0018] Step 1. Take 100 parts of XLPE, EVA, nano-graphite, PP, crosslinking agent DCP, antioxidant 300, antioxidant 1010, antioxidant DLTP, antioxidant 1024, and fluororubber masterbatch according to the proportion;

[0019] Step 2. Add XLPE, EVA, nano-graphite, PP, crosslinking agent DCP, antioxidant 300, antioxidant 1010, antioxidant DLTP, antioxidant 1024, and fluororubber masterbatch to the mixer and mix evenly;

[0020] Step 3, transfer the above materials into a closed mixer, and carry out melt blending at a temperature of 100-120°C;

[0021] Step 4, transfer the above materials into a flat vulcanizer, carry out a cross-linking reaction at 150-180° C., and obtain a cross-linked polyethylene product added with nano-graphite after 30-60 minutes;

[0022] Step 5. After cooling the product obtained...

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