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Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application thereof

A technology for polyethylene insulation and power cables, applied to plastic/resin/wax insulators, insulated conductors, insulated cables, etc., can solve the problems of increased pre-crosslinking hazards, poor lubricity in materials, high processing temperature, etc. Potential for cross-linking, improved anti-water tree performance, and less generation of low-molecular gas

Active Publication Date: 2009-06-03
上海新上化高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current chemically cross-linked polyethylene insulating plastics used for anti-water tree power cables, such as Dow's HFDB-4202 NT EC material, have the following defects: the material has poor internal lubricity, requires high processing temperature, and increases The hidden danger of pre-crosslinking causes more defects and voids inside the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] formula:

[0028] Polyethylene resin 100 parts

[0029] Ethylene-acrylate copolymer 4 parts

[0030] Peroxide 1.0 parts

[0031] Compound antioxidant 2 parts

[0032] Nucleating agent 0.1 parts

[0033] Siloxane 0.1 part

[0034] The density of polyethylene resin is 0.900g / cm 3 , the melt index is 1g / 10min;

[0035] The ethylene-acrylate copolymer is a copolymer of ethylene and acrylate X ester, wherein X ester is methyl ester and the weight content of acrylate is 10%;

[0036] The impurity content: no impurity particles with a particle size greater than 250um are allowed to be detected on a 1kg strip-shaped resin sample with a thickness of 1mm.

[0037] The peroxide is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane;

[0038] The antioxidant is tetrakis[3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionic acid]pentaerythritol ester (code 1101) and the antioxidant is 4,4'-thiobis- (6-tert-butyl-3-methylphenol), the weight ratio is 1:0.9;

[0039] The nucleating agen...

Embodiment 2

[0045] formula:

[0046] Polyethylene resin 100 parts

[0047] Ethylene-acrylate copolymer 0.5 parts

[0048] Peroxide 3.0 parts

[0049] Compound antioxidant 0.02 parts

[0050] Nucleating agent 0.5 parts

[0051] 1 part silicone

[0052] The density of polyethylene resin is 0.950g / cm 3 , the melt index is 10g / 10min;

[0053] Ethylene-acrylic acid ester copolymer is the copolymer of ethylene and acrylate X ester, wherein X ester is butyl ester, and wherein the weight content of acrylate is 50%;

[0054] The impurity content: no impurity particles with a particle size greater than 250um are allowed to be detected on a 1kg strip-shaped resin sample with a thickness of 1mm.

[0055] The peroxide is benzoyl peroxide and n-butyl 4,4-bis(tert-butylperoxy)valerate, the weight ratio is 1:1;

[0056]The antioxidants are tetrakis[3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionic acid]pentaerythritol ester (code 1101) and 4,4'-thiobis(6-tert-butyl m-cresol), the weight ratio is...

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PUM

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Abstract

The invention discloses a chemical crosslink polyethylene insulating plastic used for a water tree resistant power cable and application thereof. The insulating plastic comprises the components based on the parts by weight: 100 parts of polyethylene resin, 0.5-4 parts of ethylene-acrylic ester multipolymer, 1.0-3.0 parts of peroxide, 0.02-2 parts of compound antioxidizer, 0.1-0.5 parts of nucleating agent and 0.1-1 part of siloxane. The chemical crosslink polyethylene insulating plastic used for the medium-low pressure water tree resistant power cable has good extrudability and cable forming property, less impurity content, excellent water tree resistant performance, improved internal lubricity and good surface performance; under the same current, the extruded velocity of the cable is high, the processing temperature is reduced, less low molecular gas is generated, the impurities and defects inside the material get less, the degree of crystallinity and the water tree resistant performance are improved, the production energy consumption is reduced, and the production efficiency is improved. Therefore, the invention can be used for an insulating layer or a restrictive coating of medium-low pressure power cable.

Description

technical field [0001] The invention relates to a chemically cross-linkable polyethylene insulating plastic for water-tree-resistant power cables under medium and low voltages and its application. Background technique [0002] Water trees are the main cause of insulation failure of medium and high voltage XLPE cables. Therefore, the study of XLPE cable materials resistant to water branches has important economic value for improving the quality of XLPE cable insulation in my country. [0003] The place where water trees are produced is accompanied by the presence of space charges. The space charge effect of XLPE insulation is the main factor restricting the dielectric strength of power cable insulation. Many researchers have found that adding a small amount of polar groups to polyolefin compounds can greatly reduce the space charge accumulation in the insulation, and can also significantly reduce the probability of electrical tree formation. The copolymer of ethylene and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L83/04C08K5/00C08K5/053H01B3/44H01B7/17
Inventor 沈彬华徐永卫穆肖斌肖明宇
Owner 上海新上化高分子材料有限公司
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