Stabilized cross-linked polyolefin compositions

A composition and polyolefin technology, applied in the field of low-density polyolefin compositions, can solve the problems of insufficient scorch resistance, poor long-term stability of cables, etc.

Inactive Publication Date: 2008-03-12
ADDIVANT SWITZERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This stabilizer system overcomes the blooming problem (requirement 4), but has insufficient scorch resistance and provides poor long-term cable stability
Therefore, this stabilizer system does not match requirements 1 and 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0131] Sample Preparation

[0132] In a high-speed mixer, mix Exxon LD100MED powdered low-density polyethylene (PE) (d=0.923g / cm 3 ) was mixed with antioxidant and peroxide (2%) to give a good predispersion of antioxidant. This mixture was then carefully extruded through a single screw extruder at 130°C (below the decomposition temperature of the peroxide) to melt compound the additives. The extrudate was used for further testing. For TBM-6, the masterbatch without peroxide was first prepared at higher temperature (190°C) before compounding on the single screw extruder in order to melt blend the additives and obtain a good dispersion .

[0133] Measuring Scorch Resistance

[0134] Scorch resistance was measured by weighing 42 g of each compound (prepared above) and stirring to melt on a laboratory Brabender kneader at 135° C. initial mass temperature and 10 rpm. The test was performed to simulate the extrusion conditions of the cable. The material was kneaded for 30 minu...

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PUM

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Abstract

A composition is disclosed that includes at least one polyolefin, at least one organic peroxide, and an antioxidant mixture of a composition of at least one polyolefin, at least one organic peroxide, and an antioxidant mixture. The antioxidant mixture has at least one fast radical scavenger selected from the group consisting of low hindered phenols, low hindered thiophenols, low hindered thiobisphenols, aliphatic amines, aromatic amines, NOR HALS, hydroxylamines, and mixtures thereof, and at least one long term stabilizer selected from the group consisting of low hindered phenols, highly hindered phenols, thiosynergists, aliphatic amines, aromatic amines, HALS, hydroxylamines, and mixtures thereof. The preferred polyolefin is a homopolymer of ethylene or a copolymer of ethylene and the compositions are useful in insulating media for medium and high voltage wire and cable applications.

Description

1. Technical field [0001] The present invention relates to stable crosslinked polyolefin compositions. More particularly, the present invention relates to stable peroxide crosslinked low density polyolefin compositions useful in the preparation of insulating and semiconducting layers of electrical cables, preferably high or medium voltage electrical cables. 2. Background technology [0002] Insulation compositions, especially for neutral and high voltage cables, generally comprise polyethylene and additives. These additives often include peroxide crosslinkers, antioxidants, and optionally various other additives such as lubricity additives, anti-water-dendritic additives, and cure co-accelerators. Cross-linking auxiliary polymers meet mechanical and physical requirements such as improved heat aging and reduced pressure set. However, polymers containing peroxides are prone to scorch, ie premature crosslinking during the polymer extrusion process. Scorching causes the forma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08L23/06
CPCC08K5/14C08K5/005C08L23/06C08L2666/78C08L23/00C08J3/20
Inventor A-M·普林斯K·凯克-安托万J·S·希尔J·拜尔B·W·约翰逊
Owner ADDIVANT SWITZERLAND
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