Insulating composition and manufacturing method therefor

The insulating composition for DC XLPE cables addresses space charge accumulation and surface migration issues by using a balanced blend of LDPE, EVA, and ethylene-alkyl (meth)acrylate copolymer with controlled crosslinking agents, achieving superior insulation and heat resistance for HVDC cables.

WO2026127407A1 Publication Date: 2026-06-18HANWHA SOLUTIONS CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HANWHA SOLUTIONS CORP
Filing Date
2025-11-13
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

DC XLPE insulators in HVDC cables face issues with space charge accumulation, leading to decreased DC breakdown voltage and thermal runaway due to crosslinking by-products like cumyl alcohol and acetophenone, and TAIC's poor fusion with LDPE causes surface migration and stickiness, affecting cable performance.

⚗Method used

An insulating composition comprising LDPE, EVA, and ethylene-alkyl (meth)acrylate copolymer with controlled amounts of peroxide-based crosslinking agents and crosslinking aids, along with antioxidants, to minimize by-product generation and prevent surface migration, enhancing volume resistivity and moldability.

🎯Benefits of technology

The composition achieves improved insulation breakdown prevention, reduced space charge accumulation, and enhanced heat resistance, ensuring stable production and performance in DC transmission cables.

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Abstract

The present invention relates to an insulating composition and a manufacturing method therefor. In one embodiment, the insulating composition comprises 100 parts by weight of a base resin, 0.1 to 5 parts by weight of a peroxide-based crosslinking agent, and 0.1 to 3 parts by weight of a crosslinking coagent, wherein the base resin comprises low-density polyethylene (LDPE), and at least one of ethylene vinyl acetate (EVA) and an ethylene-alkyl (meth)acrylate copolymer.
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