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Cable insulation compositions comprising a phosphorus-containing antioxidant

An anti-oxidant and composition technology, applied in the direction of insulators, insulated conductors, insulated cables, etc., can solve the problems of filter fouling, reduced running length, and reduced yield of EHV grades, etc.

Active Publication Date: 2018-03-06
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in reduced run lengths and lower EHV grade yields as longer runs are required to achieve high EHV yields
This filter fouling phenomenon is not known in the prior art

Method used

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  • Cable insulation compositions comprising a phosphorus-containing antioxidant
  • Cable insulation compositions comprising a phosphorus-containing antioxidant
  • Cable insulation compositions comprising a phosphorus-containing antioxidant

Examples

Experimental program
Comparison scheme
Effect test

example

[0071] testing method

[0072] According to ASTM D1238, Condition 190°C / 2.16 kilogram (kg) weight (formerly known as "Condition E" and also known as I 2 ) for polyethylene melt index (MI) measurements and are reported in grams dissolved per 10 minutes. Melt index is inversely proportional to the molecular weight of the polymer. Thus, the higher the molecular weight, the lower the melt index, although the relationship is not linear.

[0073] Density was measured by the procedure of ASTM D792, Method B. Report results in grams (g) per cubic centimeter or g / cc.

[0074] MH (Maximum Torque) was measured on a Moving Die Rheometer (MDR) according to ASTM D-5289.

[0075] To evaluate the long-term heat aging performance, the cross-linked samples were aged at 150°C in air for 10 days and 21 days, and the INSTRON TM Tensile strength and ultimate elongation were analyzed on a 4201 machine.

[0076] Initial tensile strength (psi) was measured by ASTM D638.

[0077] Initial ultima...

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Abstract

The process for making extra high voltage cable insulation is improved by using a composition comprising in weight percent based on the weight of the composition: (A) 95 to 99.9% of an ethylene-basedpolymer; (B) 0.2 to 2.5% peroxide; (C) 0.01 to 0.5% of a sulfur-containing first antioxidant having at least one -S(CH2)2CO2R group, wherein R is a C6 to C20 alkyl; (D) 0.001 to 0.009%) of a phosphorus-containing second antioxidant that does not contain a -S(CH2)2C02R group, wherein R is a C6 to C20 alkyl; (E) Optionally, an organic nitrogenous base; and (F) Optionally, a phenolic third antioxidant that does not contain a -S(CH2)2C02R group, wherein R is a C6 to C20 alkyl.

Description

technical field [0001] The present invention relates to cable insulation compositions. In one aspect the invention relates to a cable insulation composition comprising a sulfur-containing antioxidant, while in another aspect the invention relates to a cable insulation composition comprising a sulfur-containing antioxidant and a phosphorus-containing antioxidant. In a further aspect the invention relates to a cable comprising a sheath prepared from said composition. Background technique [0002] Peroxide-crosslinkable insulating compounds for extra-high voltage (EHV) cable applications must be melt-filtered through fine screens during extrusion. USP 6,187,847 and 6,187,858 describe insulation formulations which, apart from being subjected to peroxidative instability during storage and exhibiting a higher water content during crosslinking, have excellent properties. USP 6,656,986 teaches that certain amine bases, if included in the composition during extrusion, can alleviate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K5/00C08K5/14
CPCC08K5/005C08K5/14C08L2207/066C08L23/06H01B3/441H01B7/295C08L23/04C08F2/01C08F10/02C08K5/16C08K5/36C08K5/49H01B3/307C08L2203/206C08K5/3435C08K5/372C08L2201/08
Inventor J·M·柯吉恩M·塔尔雷雅T·J·珀森R·罗伊T·H·彼得森J·德拉兹巴N·W·邓丘斯G·赫罗特-恩泽英克
Owner DOW GLOBAL TECH LLC
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