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Chemical crosslinked polyethylene insulating plastic for submarine cable

A technology of polyethylene insulation and chemical cross-linking, which is applied in the direction of organic insulators, plastic/resin/wax insulators, etc., can solve the problems of large fluctuations in the quality of final products, easy uneven distribution, and large molecular weight, etc., to improve the continuous running time , Improve the anti-scorch property, improve the effect of processing performance

Inactive Publication Date: 2015-04-29
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

The slighter the pre-crosslinking phenomenon, the more beneficial it is for the continuous operation of the cable. The traditional peroxide-antioxidant system has the advantages of fast crosslinking rate, good anti-thermal and oxygen aging effect, self-stable, low thermal weight loss, and anti-aging post-effect Higher advantages, but this type of system has a large molecular weight and high melting point, and it is easy to distribute unevenly inside polyethylene, resulting in large fluctuations in the quality of the final product

Method used

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  • Chemical crosslinked polyethylene insulating plastic for submarine cable
  • Chemical crosslinked polyethylene insulating plastic for submarine cable
  • Chemical crosslinked polyethylene insulating plastic for submarine cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Formula: (parts by weight)

[0024]

[0025] The peroxide adopts the chemical name of Takahashi Chemical DCP as dicumyl peroxide;

[0026] The chemical name of 300# antioxidant is 4,4'-thiobis(6-tert-butyl-3-methylphenol;

[0027] The chemical name of PS800 is dodecyl thiodipropionate;

[0028] The chemical name of 168# antioxidant is tris[2.4-di-tert-butylphenyl] phosphite;

[0029] Preparation:

[0030] After measuring each component, put them into a 300L vacuum drum preheated at 70°C, stir and mix at a speed of 5 rpm, and take a sample after 60 minutes.

[0031] Detection method:

[0032] The samples were prepared by the molding method. The sample preparation conditions were 180°C, 15min, and the pressure of the hydraulic press was greater than 15Mpa. In terms of dynamic crosslinking speed, the samples were compared and tested under the conditions of 150°C and 30 rpm in a Haka rheometer.

[0033] The prepared samples were tested using the material standards i...

Embodiment 2

[0038] Formula: (parts by weight)

[0039]

[0040] Preparation method is with embodiment 1, detection method:

[0041] The samples were prepared by the molding method. The sample preparation conditions were 180°C, 15min, and the pressure of the hydraulic press was greater than 15Mpa. In terms of dynamic crosslinking speed, the samples were compared and tested under the conditions of 150°C and 30 rpm in a Haka rheometer.

[0042] The prepared samples were tested using the material standards in GB / T12706, and the results are as follows:

[0043]

[0044] From the test data, the products made by the present invention and the process are comparable in mechanical properties and electrical properties to the products of the same raw material melt granulation method, but there is a large change in the dynamic crosslinking rate, which can delay 50% of the dynamic crosslinking rate. The rate of crosslinking can greatly reduce the frequency of downtime in the cabling process.

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Abstract

The invention provides a chemical crosslinked polyethylene insulating plastic for a submarine cable. The chemical crosslinked polyethylene insulating plastic comprises the following components in parts by weight: 100 parts of polyethylene, 1.0-3.0 parts of peroxide, 0.02-2 parts of a compound antioxidant and 0.1-2 parts of a lubricant. Appropriate peroxide and antioxidant system are adopted, so that advanced decomposition of the peroxide can be effectively prevented when a submarine cable material is processed into cables; no local high-temperature phenomenon in the processing process is ensured by addition of the lubricant; the processing property and the burning resistance of the material are improved in common; the applicability of a chemical crosslinked modified material is improved; the manifestation of traditional chemical crosslinked modified polyethylene in manufacturing of the submarine cable is changed; the pre-crosslinked phenomenon is inhibited from the source; and the continuous driving time of the submarine cable in the manufacturing process is prolonged.

Description

technical field [0001] The invention relates to a chemically cross-linkable polyethylene insulating plastic for submarine cables. Background technique [0002] Compared with ordinary polyethylene, chemically cross-linked polyethylene has greatly improved heat resistance, load capacity, heat aging resistance, and mechanical properties. At the same time, compared with polyvinyl chloride, cross-linked polyethylene has excellent electrical properties and does not burn Toxic gas, smog, no carcinogenic lead stabilizers and other characteristics, cross-linked polyethylene is widely used in the manufacture of insulated cables. In order to meet the expansion of the use of insulating cables, especially in submarine cables, higher requirements are put forward for traditional chemically cross-linked modified plastics. [0003] It is the submarine cable that is required to prolong the continuous production time as much as possible to ensure that the fixed-length cable is completed at on...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/14C08K5/372C08K5/375C08K5/526H01B3/44
CPCC08L23/0815C08L2203/202H01B3/441C08L23/06C08K5/00C08K5/14C08K5/372C08K5/375C08K5/526
Inventor 沈彬华徐晓辉
Owner 上海新上化高分子材料有限公司
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