Crosslinked Semiconducting Layer for Thermoplastic Cable Insulation
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Solution Overview
Problem
Existing electrical cables with thermoplastic insulation systems face issues such as deformation and damage to the inner semiconducting layer during the reconstruction of the electrically insulating layer, leading to detrimental effects on electrical properties and reliability, particularly in flexible joints.
Innovation Solution
Incorporating a semiconducting layer that is at least partially crosslinked, preferably without peroxides or other free radical initiators, to improve the interface with the thermoplastic electrically insulating layer, ensuring better adhesion and reducing deformation during reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermoplastic electrically insulating layer is reconstructed during cable accessory manufacturing, then the insulation system is restored, but the inner semiconducting layer suffers deformation and damage
Solution Approach 1:
The patent changes the physical-chemical state of the semiconducting layer from thermoplastic to crosslinked, fundamentally altering its thermal and mechanical properties to prevent deformation during subsequent processing steps
Solution Approach 2:
The semiconducting layer is crosslinked in advance before the electrically insulating layer is applied or reconstructed, so that when the insulating layer work is performed, the semiconducting layer is already stabilized and resistant to deformation
2Strength
If crosslinked polyethylene is used to improve electrical and mechanical properties, then dimensional stability and chemical resistance are enhanced, but unwanted by-products are entrapped within the polymer layer
Solution Approach 1:
The patent changes the crosslinking chemistry from peroxide-based to silane-based crosslinking, which fundamentally alters the chemical reaction pathway and eliminates the formation of harmful by-products like acetophenone and cumyl alcohol while still achieving the desired crosslinked network structure
Solution Approach 2:
The patent employs moisture-cured silane crosslinking which utilizes water (a mild oxidizing environment) to trigger the crosslinking reaction, avoiding the need for aggressive peroxide initiators and their associated by-products
3Stability of the object's composition
If peroxide crosslinking is used to achieve crosslinked semiconducting layer, then crosslinking is accomplished, but harmful by-products affect electrical properties
Solution Approach 1:
The patent substitutes the crosslinking mechanism from free-radical peroxide crosslinking to moisture-cured silane crosslinking, changing the chemical parameters of the crosslinking reaction to eliminate by-product formation while maintaining crosslink density and stability
Solution Approach 2:
The patent converts the typically harmful moisture (water) from a potential contaminant into a beneficial curing agent that triggers the silane crosslinking reaction, eliminating the need for peroxide and its harmful by-products while achieving the desired crosslinked structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The crosslinked semiconducting layer significantly enhances the electrical properties and reliability of the cable accessories by minimizing interface damage and improving adhesion, resulting in improved electrical performance and reliability.
Implementation Method 1
the semiconducting layer is at least partially crosslinked
Data Source
AI summary
An electrical cable or electrical cable accessory includes at least one semiconductor layer, and at least one electrically insulating layer, at least partially in direct contact with the semiconductor layer. The electrically insulating layer is obtained from an insulating polymer composition having a thermoplastic polymer material, and the semiconductor layer is at least partially crosslinked.