Benzil Voltage Stabilizer for Polyolefin Cable Insulation
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Solution Overview
Problem
Current polyolefin compositions used in medium/high/extra high voltage cables lack sufficient electrical breakdown strength, and existing voltage stabilizers either increase costs or have compatibility issues with cross-linking agents and other components, limiting their effectiveness.
Innovation Solution
A polyolefin composition incorporating a specific benzil derivative with a particular structural unit, which acts as a voltage stabilizer, enhancing electrical breakdown strength by improving electrical tree initiation and maintaining compatibility with cross-linking agents and other components, thereby reducing costs and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing voltage stabilizers are used to increase electrical breakdown strength, then electrical tree initiation is improved, but compatibility with cross-linking agents deteriorates
Solution Approach 1:
The patent modifies the chemical structure of benzil derivatives by changing substituents (R1-R10 groups) to achieve optimal balance between electrical breakdown strength and compatibility with cross-linking agents. Specific parameter changes include adding electron-withdrawing groups to reduce ionisation potential while maintaining structural compatibility with peroxide cross-linking systems.
Solution Approach 2:
The invention creates a composite voltage stabilizer system combining benzil derivative with specific polyolefin matrix and cross-linking agents. The composite formulation ensures synergistic effects where the benzil derivative enhances electrical properties without compromising the cross-linking process, achieving both improved breakdown strength and process compatibility.
2Reliability
If voltage stabilizer concentration is increased to improve electrical breakdown strength, then electrical tree initiation is enhanced, but migration tendency increases
Solution Approach 1:
The patent optimizes the concentration parameter of voltage stabilizer within specific ranges (0.01-5 wt%) and modifies the chemical structure to reduce migration. Structural parameters such as molecular weight and substituent groups are adjusted to enhance compatibility with the polyolefin matrix, thereby reducing migration tendency while maintaining effective electrical breakdown strength.
3Reliability
If voltage stabilizer is added to enhance electrical breakdown strength, then electrical tree initiation is improved, but cost increases
Solution Approach 1:
The patent achieves cost reduction by optimizing the concentration parameter of benzil derivative to minimal effective levels (0.01-5 wt%) and modifying the chemical structure to enhance stabilizer efficiency. The structural modifications allow lower dosages to achieve the same electrical breakdown strength, thereby reducing material costs.
4Reliability
If voltage stabilizer is introduced to improve electrical breakdown strength, then electrical tree initiation is enhanced, but compatibility with other composition components deteriorates
Solution Approach 1:
The patent systematically modifies multiple structural parameters of the benzil derivative including substituents at positions R1-R10 to achieve broad compatibility. Specific changes include adding groups that enhance compatibility with polyolefin matrices, cross-linking agents, and other cable insulation components while preserving the electrical stabilizer function.
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 benzil derivative-based polyolefin composition significantly enhances electrical breakdown strength, maintains low migration tendency, and ensures compatibility with cross-linking agents, resulting in improved reliability and reduced costs for medium/high/extra high voltage cable insulation.
Implementation Method 1
the voltage stabiliser provides a significant improvement on electrical tree initiation, has preferably also a good solubility in the polyolefin matrix and a low migration tendency... voltage stabilisers which improve the electrical breakdown strength of polyolefin compositions... should usually have a low ionisation potential to decrease the energy of high energy electrons
Data Source
AI summary
The present invention relates to a polyolefin composition comprising (A) a polyolefin, (B) a benzil derivative comprising, preferably consisting of, the structural unit according to the following formula (I) wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 independently from each other are hydrogen, or a hydrocarbyl group which may contain heteroatoms or at least two of said R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 together with the ring atoms of the ring system of formula (I) they are attached to, form a further aromatic or non-aromatic ring fused to the ring system of formula (I) and at least R1 or R2 is an ester group. The invention also relates to a wire or cable, in particular a medium, high or extra high voltage cable, comprising such a composition, and to the use of such a composition for the production of a wire or cable, in particular a medium, high or extra high voltage cable.