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Double-modified prepared medium-voltage water-tree-retardant polyethylene insulating material

A polyethylene insulating material, double modification technology, applied in the direction of plastic/resin/wax insulators, organic insulators, etc., can solve the problems of shortened service life of cables, and achieve the effect of accelerating the crystallization speed, inhibiting the growth process, and inhibiting the initiation process

Inactive Publication Date: 2013-04-17
ORIGIANL DOW ADVANCED COMPOUNDS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the acceleration of the country's urbanization process and strong support for various industries, the demand for corresponding cable products is also showing an increasing trend. In the field of medium and high voltage wires and cables, cross-linked polyethylene materials are dominant The insulating material still occupies a dominant position, but in the use of polyethylene materials, it is found that the polyethylene material will deteriorate internally under the dual effects of a humid environment and an electric field, which will significantly shorten the service life of the cable. This deterioration phenomenon is called for "Water Tree"

Method used

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  • Double-modified prepared medium-voltage water-tree-retardant polyethylene insulating material

Examples

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Effect test

Embodiment 1

[0038] The composite reagent for inhibiting water tree initiation and growth of the present embodiment is made up of the following components in parts by weight:

[0039] Dibenzylidene sorbitol 0.3 parts,

[0040] Ethylene-vinyl acetate copolymer 3 parts,

[0041] 10 parts of metallocene elastomer;

[0042] 100 parts by weight of low-density polyethylene (preferably having a melt index of 2.0 to 3.0 g / 10min), 0.1 parts by weight of antioxidant 300, 0.1 parts by weight of antioxidant 168, 2.5 parts by weight of DCP and the above compounding The reagents are fed into the reciprocating single-screw extruder and the single-screw extruder by using a high-precision weight-loss feeding system, and are mixed, sheared, and plasticized at 100-110°C in the reciprocating single-screw extruder. Then extrude in a single-screw extruder, granulate with spray granulation, after cooling, centrifugal dehydration, boiling drying, and realize automatic packaging by an automatic weighing and pack...

Embodiment 2

[0045] The composite reagent for inhibiting water tree initiation and growth of the present embodiment is made up of the following components in parts by weight:

[0046] 0.2 parts of sorbitol,

[0047] 3 parts of maleic anhydride grafted ethylene vinyl acetate copolymer,

[0048] Metallocene polyethylene 5 parts;

[0049] 100 parts by weight of low-density polyethylene (preferably having a melt index of 2.0 to 3.0 g / 10min), 0.2 parts by weight of antioxidant 1010, 0.2 parts by weight of antioxidant DLTP, 2.5 parts by weight of DCP and the above compounding The reagents are fed into the reciprocating single-screw extruder and the single-screw extruder by using a high-precision weight-loss feeding system, and are mixed, sheared, and plasticized at 100-110°C in the reciprocating single-screw extruder. Then extrude in a single-screw extruder, granulate with spray granulation, after cooling, centrifugal dehydration, boiling drying, and realize automatic packaging by an automatic w...

Embodiment 3

[0052] The composite reagent for inhibiting water tree initiation and growth of the present embodiment is made up of the following components in parts by weight:

[0053] 1,3: 0.3 parts of 2,4-bis(3,4-dimethylbenzylidene)sorbitol

[0054] 1 part of medium density polyethylene graft,

[0055] 10 parts of metallocene elastomer;

[0056] 100 parts by weight of low-density polyethylene (preferably having a melt index of 2.0 to 3.0 g / 10min), 0.1 parts by weight of antioxidant 300, 0.3 parts by weight of antioxidant DLTP, 2.5 parts by weight of BPO and the above-mentioned compounding The reagents are fed into the reciprocating single-screw extruder and the single-screw extruder by using a high-precision weight-loss feeding system, and are mixed, sheared, and plasticized at 100-110°C in the reciprocating single-screw extruder. Then extrude in a single-screw extruder, granulate with spray granulation, after cooling, centrifugal dehydration, boiling drying, and realize automatic pack...

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Abstract

The invention discloses a double-modified prepared medium-voltage water-tree-retardant polyethylene insulating material which comprises the following ingredients by weight: 100 parts of low-density polyethylene, 0.1-0.5 part of sorbitol acetal nucleating agent, 1-10 parts of ethylene vinyl acetate monomer modified polymer, 3-15 parts of metallocene polymer, 0.2-0.5 part of antioxygen and 1-3 parts of cross-linking agent. A compound reagent for suppressing a water-tree to trigger and grow is composed of the sorbitol acetal nucleating agent, the ethylene vinyl acetate monomer modified polymer and the metallocene polymer according to the weight part. The property of the double-modified prepared medium-voltage water-tree-retardant polyethylene insulating material provided by the invention completely meets the standard and requirements in JB / T10437-2004 Cross-Linkable Polyethylene Insulating Material Used for Wires and Cables, and the water-tree length is reduced by about 20% when compared with that of a conventional water-tree retardant cable material; an aging test on the water-tree is carried out by using a cup-shaped testing device recommended in the IEC / TS61956 standard, and the rest result shows that the material has excellent water-tree-retardant property.

Description

technical field [0001] The invention relates to the field of medium-voltage cross-linked polyethylene insulating cable materials, in particular to a medium-voltage water-tree-resistant polyethylene insulating material prepared by double modification. Background technique [0002] With the acceleration of the country's urbanization process and strong support for various industries, the demand for corresponding cable products is also showing an increasing trend. In the field of medium and high voltage wires and cables, cross-linked polyethylene materials are dominant The insulating material still occupies a dominant position, but in the use of polyethylene materials, it is found that the polyethylene material will deteriorate internally under the dual effects of a humid environment and an electric field, which will significantly shorten the service life of the cable. This deterioration phenomenon is called For "water tree". In order to reduce the occurrence of cable accidents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L51/06C08K5/14C08K5/053H01B3/44
Inventor 怀宝祥侯海良翁文彪程金星
Owner ORIGIANL DOW ADVANCED COMPOUNDS SHANGHAI
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