Thermoplastic Polypropylene Cable Insulation for Heat Dissipation
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Solution Overview
Problem
Medium and high voltage energy cables face limitations with existing insulating materials, such as crosslinked polyethylene (XLPE) which are not easily recyclable and have production speed restrictions, and polypropylene which lacks thermal conductivity, leading to inefficiencies in energy transport and potential overheating.
Innovation Solution
A thermoplastic polymer material with a continuous polypropylene matrix obtained by Ziegler-Natta type polymerization, dispersed with high density polyethylene, providing improved thermal conductivity and mechanical properties, allowing for recyclability and high-temperature performance without crosslinking agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If crosslinked polyethylene (XLPE) is used for insulating layers, then thermal conductivity and temperature resistance are improved, but recyclability deteriorates and manufacturing speed is restricted
Solution Approach 1:
The patent changes the fundamental parameter of polymer crosslinking state from crosslinked (XLPE) to thermoplastic (non-crosslinked), enabling both high-temperature resistance and fast manufacturing. The thermoplastic material achieves temperature resistance through its inherent thermal stability rather than crosslinking, allowing extrusion at high speeds without crosslinking tunnel constraints.
Solution Approach 2:
The patent uses a composite material system combining thermoplastic polymer base resin with specific inorganic fillers (such as aluminum trihydrate, magnesium hydroxide, or titanium dioxide) to achieve both high-temperature resistance and thermal conductivity without requiring crosslinking, thus maintaining recyclability and enabling fast manufacturing.
2Ease of manufacture
If polypropylene is used for insulating layers, then recyclability and ease of manufacture are improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent creates a composite material by combining thermoplastic polymer (such as polypropylene) with inorganic fillers having high thermal conductivity (such as aluminum trihydrate, magnesium hydroxide, or titanium dioxide). This composite structure maintains the ease of manufacture and recyclability of thermoplastics while achieving the required thermal conductivity through the filler material.
Solution Approach 2:
The patent applies local quality enhancement by incorporating inorganic fillers specifically to improve thermal conductivity in regions where heat dissipation is critical, while maintaining the overall thermoplastic matrix structure that provides ease of manufacture and recyclability.
3Temperature
If crosslinking process is applied to polyethylene, then temperature resistance is improved, but manufacturing complexity and production time increase
Solution Approach 1:
The patent fundamentally changes the manufacturing parameter from crosslinking process to thermoplastic extrusion process. This eliminates the need for complex crosslinking tunnels and multi-step manufacturing, reducing production complexity while maintaining temperature resistance through the thermoplastic material's inherent properties and inorganic filler reinforcement.
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 solution enhances thermal conductivity, mechanical properties, and recyclability of insulating layers in medium and high voltage cables, enabling efficient energy transport and extended operational temperatures without the drawbacks of existing materials.
Implementation Method 1
the material constituting the insulating layer can be recycled, obtained without burning out at speeds of high extrusion and also having good thermal conductivity properties
Data Source
Figure 1~2
AI summary
The invention relates to a medium-or high-voltage power cable comprising an elongate, electrically conductive element, a first semiconductor layer, an electrically insulating layer, and a second semiconductor layer. According to the invention, the electrically insulating layer comprises at least a layer of a thermoplastic polymer material including a continuous matrix of polypropylene with polyethylene dispersed therein. The invention also relates to a method for producing such a cable.