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Polymer composition for wire and cable applications with advantageous thermomechanical behaviour and electrical properties

A composition and polymer technology, applied in electrical components, conductor/cable insulation, circuits, etc., can solve the problems of strong temperature and electric field dependence affecting electric field, low conductivity, etc.

Pending Publication Date: 2019-02-12
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the strong temperature and electric field dependence of this property will affect the electric field
The second problem is the fact that heat is generated inside the insulator by leakage currents flowing between the inner and outer semiconducting layers
[0017] WO2011 / 113686 reported low electrical conductivity of blends of LDPE and HDPE compared to pure LDPE

Method used

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  • Polymer composition for wire and cable applications with advantageous thermomechanical behaviour and electrical properties
  • Polymer composition for wire and cable applications with advantageous thermomechanical behaviour and electrical properties
  • Polymer composition for wire and cable applications with advantageous thermomechanical behaviour and electrical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0247] Several mixtures were prepared by melt mixing in a Haake miniature twin-screw extruder at 210 °C for 10 min, followed by hot pressing of 40 mm × 100 mm area samples at 220 °C and 100 kN pressure. Spacers with a thickness of 1 mm were used to control the thickness. Additional heat treatment was applied to one sample by remelting the pressed sample on a hot plate preheated to 250 °C for 3 min, followed by slow cooling by turning the hot plate. The samples were taken out when the temperature reached 200°C, and then finally cooled at room temperature. Composition studies are shown in Table 2.

[0248] Table 2: Polymer compositions according to the invention and reference compositions:

[0249] components

Composition of the present invention 1

Comparative Composition 1

Comparative Composition 2

LDPE, wt%

98

100

98

P3HT, wt%

2

-

-

HDPE, wt%

-

-

2

[0250] Creep measurement

[0251] exist figure 1...

Embodiment 2

[0257] Several mixtures were prepared by melt mixing the components in a Haake miniature twin-screw extruder at 160°C for 10 minutes, followed by hot pressing a 40 mm x 100 mm area sample at 250°C and 100 kN pressure. Spacers with a thickness of 0.1 mm were used to control the thickness. Conductivity results are shown in Table 2 and figure 1 middle.

[0258] Table 3: Polymer compositions according to the invention and reference compositions and conductivity results:

[0259]

[0260]As can be seen from Table 3, the polymer compositions of Examples 2-5 of the present invention exhibit excellent low DC conductivity. Furthermore, when pure LDPE was enhanced with P3HT, the DC conductivity decreased by about 2 orders of magnitude. The polymer composition of the invention is particularly suitable for use in DC power cables, preferably in HV DC power cables.

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Abstract

The invention provides a polymer composition comprising a) a low density polyethylene (LDPE); and b) a conjugated aromatic polymer. The invention also relates to cables comprising said polymer composition and the use of the polymer composition in the manufacture of an insulation layer of cable.

Description

technical field [0001] The present invention relates to a polymer composition useful for the production of insulation layers for electric cables, such as direct current (DC) power cables. In particular, the present invention relates to a polymer composition, which is a blend of LDPE and a conjugated aromatic polymer, with surprisingly high thermomechanical resistance and low electrical conductivity. In one embodiment, the polymer compositions of the present invention are used in uncrosslinked form, thus avoiding the need for the presence of crosslinking agents and avoiding the need for post-crosslinking and degassing procedures to remove crosslinker by-products . In another embodiment, the polymer composition is optionally crosslinkable and thus can be subsequently crosslinked. [0002] The invention also relates to a cable and a process for the production of such a cable, such as a direct current (DC) power cable, comprising a polymer composition in at least an insulating l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04H01L51/00
CPCC08L23/04H01B3/301H01B3/441H01B13/14C08L65/00C08L25/18C08L23/06C08L2203/202C08L2207/066
Inventor 佩尔奥拉·哈格斯特兰德T·库尔木派斯A·吉特萨斯M·安德森C·米勒
Owner BOREALIS AG
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