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Method for making cable evelope layer by extruded and cross-linked silane graft polymer composition and cable containing sheath

A technology of silane grafting and cable sheathing, which is applied in the direction of insulated cables, cable/conductor manufacturing, conductor/cable insulation, etc., which can solve the problems of unfavorable industrial scale production, expensive devices, huge, etc.

Inactive Publication Date: 2003-04-30
NEXANS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Since the cross-linking "in the pool" requires a series of operations on the completed cable, it requires placing the coiled cable in a large tank filled with water in order to obtain sufficient cross-linking of the manufactured sheath , therefore, this method is not conducive to its industrial-scale production
The efficiency of manufacturing cables in this way is also moderate, and at the same time the manufacturing plant requires huge and expensive installations, which is very disadvantageous in terms of industry

Method used

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  • Method for making cable evelope layer by extruded and cross-linked silane graft polymer composition and cable containing sheath

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Prepare composition A in the above-mentioned method, this composition comprises:

[0051] 100 parts of 1% EVA grafted with a silane compound (97% vinyltrimethoxysilane and 3% peroxide);

[0052] 170 parts aluminum hydroxide Al(OH) 3, as a fireproof filler;

[0053] 3 parts paraffin, as a processing agent;

[0054] · 1 part UV stabilizer; and

[0055] · 2 parts antioxidant.

[0056] The extruded sheath obtained from this mixture was placed on the cable in a bath at 70° C. for 24 hours to complete the crosslinking.

Embodiment 2

[0058] The method described above was used to compare a composition B comprising:

[0059] 100 parts of 1% EVA grafted with a silane compound (97% vinyltrimethoxysilane and 3% peroxide);

[0060] 170 parts aluminum hydroxide Al(OH) 3 , as a fireproof filler;

[0061] 3 parts paraffin, as a processing agent;

[0062] 1 part UV stabilizer;

[0063] 2 servings of antioxidants; and

[0064] • 0.5 parts of Dynasilan 1189 stabilizer, sold by the supplier DEGUSSA and constituting a compound containing a secondary amine function: N-(n-butyl)-3-aminopropyltrimethoxysilane.

[0065] The extruded sheath obtained from this composition was completely crosslinked after 5 days in ambient air.

[0066] It should be noted that the mechanical and electrical properties of the sheath obtained using composition B are similar to the sheath obtained using composition A, ie, composition B meets the requirements for use in power cables.

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Abstract

The present invention provides a method of manufacturing a cable sheath by extruding and cross-linking a composition based on a silane-grafted polymer, the method comprising the following steps: a) mixing the following compounds: i) a thermoplastic base polymer or a mixture of thermoplastic base polymers; ii) a first silane-based compound; and iii) a generator of free radicals; b) extruding said mixture onto a cable to obtain said sheath; c) cross-linking said sheath. The invention is characterised that a compound with a secondary amino group is incorporated before the mixing process and crosslinking is carried out in the ambient atmosphere.

Description

technical field [0001] The invention relates to a method for producing cable sheaths by extruding and crosslinking a composition based on silane-grafted polymers, and to a cable comprising the sheath obtained by this method. Background technique [0002] Throughout the text, the term "sheath" is used indiscriminately to denote the electrical insulation of the cable or the outer protective layer suitable for the cable. [0003] Silane grafted polymers are well known and they are used in particular for insulating and covering power cables used at low, medium, high and quite high voltages. They have the advantage of particularly favorable electrical insulation and mechanical strength properties, the crosslinking increasing the mechanical strength and the temperature stability of the polymer. [0004] It is known that the physical properties of polymers can be altered by crosslinking of polymer chains. Crosslinking by means of silanes, and more generally, the use of one or mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/24C08F255/02C08F255/06C08F265/04C08L51/00C08L51/06H01B3/44
CPCC08F255/026C08F255/06C08F265/04H01B3/441C08L51/06C08F255/02C08L51/003C08L2666/02H01B13/24
Inventor 钱泰尔·巴里奥兹
Owner NEXANS
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