Water-tree-retardant crosslinked polyethylene cable material and cable prepared from same

Abstract

The invention belongs to the technical field of materials and wire cables, and relates to a water-tree-retardant crosslinked polyethylene cable material. The invention is characterized in that the cable material is prepared from linear low-density polyethylene, styrene, polyurethane thermoplastic elastomer, polyethyleneglycol, ethylene-ethyl acetate copolymer, polyethylene wax or paraffin, commercially available nucleator 4030 for wire cable plastics, di-tert-butyl peroxide, benzoperoxide, commercially available antioxidant 300 for plastics or commercially available antioxidant 1010 for plastics or commercially available antioxidant 168 for plastics, and carbon black, wherein the weight ratio of the linear low-density polyethylene to the styrene is 8-10. The invention also relates to a preparation method of the cable material and a water-tree-retardant cable using the cable material. The cable has the advantages of favorable waterproofing effect, simple structure, more stable electric / mechanical / environmental properties, higher reliability and the like, is easy to produce and does not generate water trees.

Description

technical field

[0001] The invention belongs to the technical field of materials and cables, and in particular relates to a water-tree-resistant cross-linked polyethylene cable material and a cable using the material. Background technique

[0002] At present, medium-voltage power cables are mostly insulated with XLPE. Ordinary XLPE insulated cables are damaged by mechanical stress or external force during laying and operation, or the cables are operated for a long time in a humid and watery environment, which will cause External moisture penetrates into the cable, and the chance of forming water trees under the action of the electric field is greatly increased. The water trees are transformed into permanent electric trees under the action of the electric field, which leads to insulation breakdown in a short period of time. Once the outer sheath of the cable is damaged and the cable enters water, the steel strip and copper strip will be corroded, the insulation performance w...

Examples

Embodiment 1

[0050] Implementation example 1 is an embodiment of the water-tree-resistant crosslinked polyethylene cable material of the present invention, and implementation examples 2-6 are implementation examples of using water-tree-resistant cables.

[0051] Implementation example 1

[0052] A water-tree-resistant XLPE cable material is characterized in that it is composed of the following raw materials in parts by weight:

[0053] Linear low-density polyethylene: 60-80 parts;

[0054] Styrene: 6-10 parts;

[0055] Polyurethane thermoplastic elastomer: 3 to 8 parts;

[0056] Polyethylene glycol: 3 to 6 parts;

[0057] Ethylene-ethyl acetate copolymer: 5-8 parts;

[0058] Polyethylene wax or paraffin: 3 to 5 parts;

[0059] Commercially available model 4030 nucleating agent for cable plastics: 0.2 to 0.8 parts;

[0060] Di-tert-butyl peroxide: 0.5 to 1 part;

[0061] Benzoyl peroxide: 0.2 to 1 part;

[0062] Antioxidant of type 300 for commercially available plastics or an...

Embodiment 2

[0102] please see figure 1 , a water tree resistant cross-linked polyethylene cable 10, comprising a conductor 1, an insulating layer 2 coated on the conductor 1 by extrusion and extrusion, and a cross-linked polyethylene sheath layer 5 outside the insulating layer. It is characterized in that there is a composite water-blocking layer 3 outside the insulating layer, an armor layer 4 is outside the composite water-blocking layer, and the cross-linked polyethylene sheath layer is extruded and coated on the outside of the armor layer; the composite water-blocking layer is composed of a first water-blocking film layer 32 and baseband layer 31, the baseband layer is close to the insulating layer; the first water-blocking film layer is bonded on the baseband layer; the material of the cross-linked polyethylene sheath layer is the anti-water tree in the prior art XLPE cable material or the anti-water tree XLPE cable material described in Example 1.

Embodiment 3

[0104] please see figure 2 , a water tree resistant cross-linked polyethylene cable 10, comprising a conductor 1, an insulating layer 2 coated on the conductor 1 by extrusion and extrusion, and a cross-linked polyethylene sheath layer 5 outside the insulating layer. It is characterized in that there is a composite water-blocking layer 3 outside the insulating layer, an armor layer 4 is outside the composite water-blocking layer, and the cross-linked polyethylene sheath layer is extruded and coated on the outside of the armor layer; the composite water-blocking layer is composed of a first water-blocking film Layer 32, baseband layer 31, and second water-blocking film layer 30, the second water-blocking film layer is close to the insulating layer; the first water-blocking film layer and the first water-blocking film layer are respectively bonded to the two sides of the baseband layer The material of the cross-linked polyethylene sheath layer is the water-tree-resistant cross-l...

technical field

[0001] The invention belongs to the technical field of materials and cables, and in particular relates to a water-tree-resistant cross-linked polyethylene cable material and a cable using the material. Background technique

[0002] At present, medium-voltage power cables are mostly insulated with XLPE. Ordinary XLPE insulated cables are damaged by mechanical stress or external force during laying and operation, or the cables are operated for a long time in a humid and watery environment, which will cause External moisture penetrates into the cable, and the chance of forming water trees under the action of the electric field is greatly increased. The water trees are transformed into permanent electric trees under the action of the electric field, which leads to insulation breakdown in a short period of time. Once the outer sheath of the cable is damaged and the cable enters water, the steel strip and copper strip will be corroded, the insulation performance w...

Examples

Embodiment 1

[0050] Implementation example 1 is an embodiment of the water-tree-resistant crosslinked polyethylene cable material of the present invention, and implementation examples 2-6 are implementation examples of using water-tree-resistant cables.

[0051] Implementation example 1

[0052] A water-tree-resistant XLPE cable material is characterized in that it is composed of the following raw materials in parts by weight:

[0053] Linear low-density polyethylene: 60-80 parts;

[0054] Styrene: 6-10 parts;

[0055] Polyurethane thermoplastic elastomer: 3 to 8 parts;

[0056] Polyethylene glycol: 3 to 6 parts;

[0057] Ethylene-ethyl acetate copolymer: 5-8 parts;

[0058] Polyethylene wax or paraffin: 3 to 5 parts;

[0059] Commercially available model 4030 nucleating agent for cable plastics: 0.2 to 0.8 parts;

[0060] Di-tert-butyl peroxide: 0.5 to 1 part;

[0061] Benzoyl peroxide: 0.2 to 1 part;

[0062] Antioxidant of type 300 for commercially available plastics or an...

Embodiment 2

[0102] please see figure 1 , a water tree resistant cross-linked polyethylene cable 10, comprising a conductor 1, an insulating layer 2 coated on the conductor 1 by extrusion and extrusion, and a cross-linked polyethylene sheath layer 5 outside the insulating layer. It is characterized in that there is a composite water-blocking layer 3 outside the insulating layer, an armor layer 4 is outside the composite water-blocking layer, and the cross-linked polyethylene sheath layer is extruded and coated on the outside of the armor layer; the composite water-blocking layer is composed of a first water-blocking film layer 32 and baseband layer 31, the baseband layer is close to the insulating layer; the first water-blocking film layer is bonded on the baseband layer; the material of the cross-linked polyethylene sheath layer is the anti-water tree in the prior art XLPE cable material or the anti-water tree XLPE cable material described in Example 1.

Embodiment 3

[0104] please see figure 2 , a water tree resistant cross-linked polyethylene cable 10, comprising a conductor 1, an insulating layer 2 coated on the conductor 1 by extrusion and extrusion, and a cross-linked polyethylene sheath layer 5 outside the insulating layer. It is characterized in that there is a composite water-blocking layer 3 outside the insulating layer, an armor layer 4 is outside the composite water-blocking layer, and the cross-linked polyethylene sheath layer is extruded and coated on the outside of the armor layer; the composite water-blocking layer is composed of a first water-blocking film Layer 32, baseband layer 31, and second water-blocking film layer 30, the second water-blocking film layer is close to the insulating layer; the first water-blocking film layer and the first water-blocking film layer are respectively bonded to the two sides of the baseband layer The material of the cross-linked polyethylene sheath layer is the water-tree-resistant cross-l...

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