Polyolefin composition for cable insulation

By preparing a polyolefin composition with a specific composition, the problem of unstable performance of medium-voltage, high-voltage, and ultra-high-voltage cable insulation materials at high temperatures was solved, achieving a balance between high electrical breakdown strength and mechanical properties of cable insulation materials, suitable for medium-voltage, high-voltage, and ultra-high-voltage cables.

CN121909244APending Publication Date: 2026-04-21BOREALIS AG
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Patent Information

Application Number
CN202480061294.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-09-28
Filing Date
2024-03-28
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The insulation materials of existing medium-voltage, high-voltage, and ultra-high-voltage cables have unstable performance and insufficient flexibility at high temperatures, and traditional materials have large losses at high voltages, making it difficult to meet the high-performance requirements of cables.

Method used

Polyolefin compositions prepared by the crystallization extraction (CRYSTEX) method contain specific ranges of ethylene and propylene content, melt flow rate, crystal fraction, and soluble fraction, and possess good flexibility, mechanical properties, and electrical breakdown strength, making them suitable for cable insulation.

Benefits of technology

It achieves a good balance of performance over a wide temperature range, including high electrical breakdown strength, mechanical properties and thermal conductivity, and is suitable for insulation materials of medium voltage, high voltage and ultra-high voltage cables.

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Abstract

The present invention relates to a polyolefin composition, to an article comprising said polyolefin composition, preferably to a cable comprising an insulating layer comprising said polyolefin composition, and to the use of said polyolefin composition as cable insulation for medium and high voltage cables, the polyolefin composition having a total ethylene content of from 20.0 to 32.5 wt% based on the total weight of the polyolefin composition and determined by Crystallization Extraction (CRYSTEX) by FT-IR spectroscopy calibrated by Quantitative 13C-NMR spectroscopy; a melt flow rate MFR2, determined according to ISO 1133 at 230 DEG C and 2.16 kg, of greater than 2.5 to 6.0 g / 10 min; a crystalline fraction (CF) content determined by crystallization extraction (CRYSTEX) in an amount, based on the total weight of the polyolefin composition, in the range of 75.0 to 95.0 wt%, said crystalline fraction (CF) having an ethylene content (C2 (CF)) determined by FT-IR spectroscopy calibrated by quantitative 13C-NMR spectroscopy in the range of 18.0 to 32.5 wt%, based on the total amount of monomer units in the crystalline fraction (CF), and a soluble fraction (SF) content, determined by crystallization extraction (CRYSTEX), in an amount, based on the total weight of the polyolefin composition, in the range of 5.0 to 25.0 wt%, said soluble fraction (SF) having an intrinsic viscosity (iV (SF)), determined according to ISO 1628-3, in the range of 90 to 200 cm3 / g.
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