Reversible Crosslinked Conductor Coating for Recyclable Insulation
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Solution Overview
Problem
Crosslinked polyethylene (XLPE) is energy-intensive to produce and lacks recyclability, failing to meet mechanical and insulative performance in power cables, while non-crosslinked alternatives do not provide sufficient thermomechanical integrity.
Innovation Solution
A crosslinked ethylene-based polymer coating using 2,2,6,6-tetramethyl-4-piperidyl methacrylate disulfide (BiTEMPS) methacrylate forms a reversible crosslinking network, allowing reprocessing and recyclability without compromising mechanical and insulative properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peroxide-initiated crosslinking is used to produce XLPE, then thermomechanical integrity and insulative performance are improved, but energy consumption and equipment complexity increase
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by replacing peroxide initiators with transition metal catalysts (such as cobalt, nickel, or copper salts) and using silane or vinyl-functional polymers instead of conventional crosslinkable groups. This parameter change enables crosslinking to occur at lower temperatures and reduces the energy-intensive post-extrusion processing required by peroxide systems.
Solution Approach 2:
The patent substitutes the thermal-mechanical post-extrusion processing equipment (heating zones, cooling zones, degassing equipment) with a chemical catalysis system that operates at lower temperatures. The transition metal catalysts enable crosslinking to proceed under milder conditions, reducing or eliminating the need for complex post-extrusion thermal processing equipment.
2Reliability
If peroxide-initiated crosslinking is used to produce XLPE, then thermomechanical integrity is improved, but device complexity increases
Solution Approach 1:
The patent replaces the complex mechanical and thermal processing equipment (multiple heating zones, cooling systems, degassing equipment) with a simpler chemical catalysis system. The transition metal catalysts enable crosslinking to occur during or immediately after extrusion at lower temperatures, eliminating the need for extensive post-extrusion processing equipment.
Solution Approach 2:
The patent extracts and removes the energy-intensive post-extrusion processing steps (heating to high crosslinking temperatures, extended cooling zones, degassing equipment) from the manufacturing line. By using transition metal-catalyzed crosslinking that proceeds at lower temperatures, these complex equipment components become unnecessary.
3Ease of manufacture
If non-crosslinked polyethylene is used to reduce equipment costs, then manufacturing simplicity is improved, but mechanical strength and thermomechanical integrity deteriorate
Solution Approach 1:
The patent changes the molecular structure parameters by introducing crosslinks through transition metal-catalyzed reactions between silane or vinyl-functional groups on polymer chains. This creates a three-dimensional network structure that provides the mechanical strength and thermomechanical integrity normally associated with highly crosslinked systems, while maintaining manufacturing simplicity.
Solution Approach 2:
The patent creates a composite structure at the molecular level by forming crosslinked networks within the polyethylene matrix using transition metal catalysts. The combination of the polyethylene base material with the crosslinked network structure produces a composite material that exhibits both the ease of processing of thermoplastics and the mechanical strength of crosslinked systems.
4Reliability
If conventional crosslinked polyethylene is used, then insulative performance is improved, but recyclability deteriorates
Solution Approach 1:
The patent introduces dynamic and reversible crosslinking mechanisms that allow the crosslinked network to be reconfigured or broken down under specific conditions (such as presence of chelating agents or at elevated temperatures). This dynamic character enables the material to be recycled or reprocessed, unlike conventional permanently crosslinked XLPE while maintaining insulative performance through the crosslinked structure during service.
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 coating provides thermomechanical integrity and recyclability, reducing production costs and energy consumption by enabling reprocessing and reuse of the ethylene-based polymer composition.
Implementation Method 1
a crosslinked composition formed from starting materials comprising an ethylene-based polymer, and 2,2,6,6-tetramethyl-4-piperidyl methacrylate disulfide (BiTEMPS) methacrylate
Implementation Method 2
linkages having a Structure (2) below
Implementation Method 3
heating the coating to a reprocessing temperature, and forming, at the reprocessing temperature, the coating into a re-processable ethylene-based polymer composition
Implementation Method 4
cooling the re-processed pre-form to below the reprocessing temperature and forming a second article composed of a re-crosslinked ethylene-based polymer composition
Data Source
AI summary
The present disclosure is directed to a coated conductor. In an embodiment, the coated conductor includes a conductor and a coating on the conductor. The coating is composed of a crosslinked composition formed from starting materials comprising an ethylene-based polymer, and 2,2,6,6-tetramethyl-4-piperidyl methacrylate disulfide (BiTEMPS) methacrylate. This yields a coating that is composed of a crosslinked composition comprising (i) an ethylene-based polymer, and linkages having a Structure (2).