Propylene Resin Cable Insulation for Void-Resistant Bending
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Solution Overview
Problem
Propylene-based resins used in insulating layers of power cables face challenges in maintaining insulation integrity when subjected to external stress, such as bending, due to the formation of voids which degrade the insulation performance.
Innovation Solution
Incorporating a resistance-imparting agent with a phenol skeleton and specific molecular weight and melting point into the resin composition to fill voids and enhance the insulating layer's resistance to stress-induced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If propylene-based resin is used in insulating layer, then recyclability and handling are improved, but insulation performance degrades under external stress
Solution Approach 1:
The patent creates a composite material system by combining propylene-based resin with specific additives (antioxidants and processing aids) to achieve both recyclability and maintained insulation performance. The composite formulation allows the insulating layer to retain its protective properties even after bending or external stress application.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the propylene-based resin system by controlling antioxidant content (0.1-5 wt%), processing aid content (0.1-5 wt%), and molecular weight distribution. These parameter adjustments enable the material to maintain insulation performance while preserving recyclability and handling characteristics.
2Reliability
If cross-linked polyethylene is used for insulating layer, then insulation performance is improved, but recyclability is lost
Solution Approach 1:
Instead of using cross-linked polyethylene which provides good insulation but poor recyclability, the patent inverts the approach by using non-cross-linked propylene-based resin with carefully selected additives. This alternative formulation achieves acceptable insulation performance while maintaining recyclability, effectively reversing the traditional material selection logic.
Solution Approach 2:
The patent changes the fundamental parameter of polymer cross-linking status from cross-linked to non-cross-linked, while compensating for potential performance losses through additive selection. This parameter change enables the material to be both recyclable and sufficiently insulating for cable applications.
3Ease of operation
If insulating layer is bent or subjected to external stress, then flexibility is improved, but voids form and insulation degrades
Solution Approach 1:
The patent applies beforehand cushioning by incorporating antioxidants and processing aids into the propylene-based resin formulation before the insulating layer is manufactured. These additives pre-condition the material to resist degradation when voids form during bending, thereby cushioning against insulation performance loss before stress is applied.
Solution Approach 2:
The patent converts the harmful effect of void formation during bending into a beneficial outcome by using additives that prevent void-related degradation. The voids that would normally cause insulation failure instead become acceptable features because the antioxidant system prevents degradation at void interfaces, turning a potential defect into a tolerated characteristic.
Data Source
AI summary
A resin composition, including a resin component containing propylene units, and a resistance-imparting agent, wherein the resistance-imparting agent is a monomer having a phenol skeleton with hydrogen or an alkyl group having 1 to 3 carbon atoms, bonded to at least one of ortho positions to the hydroxyl group of the phenol skeleton, and has a melting point of 145° C. or less and a molecular weight of 200 or more and 500 or less, and a content of the resistance-imparting agent is 0.4 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component.