Polyolefin Cable Coating With High-MW HALS for Wet Insulation
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Solution Overview
Problem
Conventional moisture-curable compositions for wire and cable insulation exhibit unacceptably low wet electrical insulation resistance and inferior retained dielectric strength after glancing impact, particularly when using halogen-free flame retardants and hindered amine light stabilizers.
Innovation Solution
A composition comprising a silane-functionalized polyolefin, a halogen-free flame retardant, and a hindered amine light stabilizer (HALS) with a weight average molecular weight greater than 5,000 Dalton, which provides improved wet electrical insulation resistance and retained dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hindered amine light stabilizers are used in moisture curable compositions with halogen-free flame retardants, then UV light stabilization is improved, but wet electrical insulation resistance deteriorates over time at elevated temperatures
Solution Approach 1:
The patent changes the molecular weight parameter of the HALS from conventional low molecular weight to high molecular weight (greater than 5,000 Dalton), which fundamentally alters the stabilizer's behavior in the composition. This parameter change allows the HALS to provide UV stabilization without the harmful migration and degradation that causes insulation resistance deterioration over time.
Solution Approach 2:
The patent creates a composite coating composition system that integrates silane-functionalized polyolefin, halogen-free flame retardant, and high molecular weight HALS. This composite material approach ensures compatible interactions between components, where the high molecular weight HALS works synergistically with the other additives to maintain both UV stabilization and electrical insulation properties without compromise.
2Object-affected harmful factors
If conventional hindered amine light stabilizers are used in moisture curable compositions with flame retardants, then UV light stabilization is improved, but retained dielectric strength after glancing impact deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the HALS to high molecular weight (greater than 5,000 Dalton), which prevents the stabilizer from migrating to the surface or interface during impact events. This parameter change ensures that the HALS remains distributed within the bulk of the coating, maintaining dielectric strength integrity even after mechanical stress from glancing impact.
Solution Approach 2:
The patent develops a composite material system where high molecular weight HALS is integrated with silane-functionalized polyolefin and flame retardants. This composite structure ensures that the HALS is embedded within the matrix, providing UV protection without compromising the mechanical and dielectric strength properties of the coating after impact.
3Object-affected harmful factors
If halogen-free flame retardants are used in moisture curable compositions, then environmental safety is improved, but wet electrical insulation resistance deteriorates when combined with conventional light stabilizers
Solution Approach 1:
The patent changes the molecular weight parameter of the HALS to high molecular weight (greater than 5,000 Dalton), which eliminates the compatibility issue between halogen-free flame retardants and light stabilizers. This parameter change prevents the formation of degradation products that would otherwise compromise electrical insulation resistance, allowing halogen-free formulations to maintain both environmental safety and electrical performance.
Data Source
AI summary
The present disclosure provides a composition. The composition includes a silane functionalized polyolefin; a flame retardant; and a hindered amine light stabilizer (HALS) having a Mw greater than 5,000 Dalton. The present disclosure also provides a coated conductor. The coated conductor includes a conductor and a coating on the conductor, the coating including a composition. The coating composition includes a silane functionalized polyolefin; a flame retardant; and a hindered amine light stabilizer (HALS) having a Mw greater than 5,000 Dalton.