Polyolefin Cable Insulation Voltage Stabilizer Composition
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Solution Overview
Problem
Current polyolefin compositions used in medium, high, and extra high voltage cables lack sufficient electrical breakdown strength, despite the use of clean insulation materials and active additives, necessitating the development of voltage stabilizers with low ionization potential, good solubility, low migration tendency, and compatibility with cross-linking agents.
Innovation Solution
A polyolefin composition incorporating a specific voltage stabilizer compound with a structural unit of formula (I), which enhances electrical breakdown strength, solubility, and compatibility with cross-linking agents, while minimizing migration and maintaining low ionization potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If super clean materials are used for insulation to reduce contaminants, then electrical breakdown strength is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent introduces voltage stabilizer compounds as intermediary substances that actively enhance electrical breakdown strength through chemical mechanisms. These compounds interact with high-energy electrons and electrical trees to increase initiation fields, providing a chemical solution rather than relying solely on physical purification of materials. This mediator approach allows achieving high reliability without the prohibitive costs of super clean material production.
2Reliability
If active additives (voltage stabilisers) are used to increase electrical breakdown strength, then electrical tree initiation field is improved, but solubility and migration tendency become critical issues
Solution Approach 1:
The patent systematically optimizes molecular parameters of voltage stabilizer compounds, including ionization potential, molecular weight, and structural characteristics. By adjusting these parameters, the invention achieves compounds with low ionization potential (for high electrical performance) while simultaneously ensuring adequate solubility in polyolefin and low migration tendency. This parameter optimization allows balancing electrical performance with compositional stability.
Solution Approach 2:
The patent introduces specific structural features at local positions within the voltage stabilizer molecules, such as aromatic rings, heteroatoms, and hydrocarbyl groups in defined configurations. These local structural qualities enhance electrical breakdown strength through electron interaction while the overall molecular design maintains solubility and minimizes migration. The local quality modifications allow fine-tuning of both electrical and physical properties.
3Reliability
If voltage stabiliser compounds with low ionisation potential are used to decrease electron energy, then electrical breakdown strength is improved, but compatibility with cross-linking agents may be compromised
Solution Approach 1:
The patent optimizes the molecular structure parameters of voltage stabilizers to achieve low ionization potential while maintaining chemical compatibility. By carefully selecting molecular weight, structural configuration, and functional groups, the invention ensures that compounds with desired electrical properties do not interfere with peroxide cross-linking mechanisms or decompose under cross-linking conditions, thus maintaining versatility with common cross-linking agents.
Solution Approach 2:
The patent addresses potential negative interactions between voltage stabilizers and cross-linking agents by designing compounds that can withstand cross-linking conditions without degradation. The structural features that provide low ionization potential for electrical performance are configured to resist decomposition during cross-linking, effectively converting a potential compatibility problem into a robust multi-functional compound that serves both electrical and processing requirements.
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 composition significantly improves electrical breakdown strength, maintains stability over time, and is compatible with other components, making it suitable for high voltage cable insulation.
Implementation Method 1
the voltage stabiliser must have a low ionisation potential to decrease the energy of high energy electrons and hence increase the electrical breakdown strength efficiently
Data Source
Figure 1~3
Figure 4
AI summary
The present invention relates to a polyolefin composition comprising (A) a polyolefin, (B) a compound comprising, preferably consisting of, the structural unit according to the following formula (I) wherein R is C or N; is hydrogen, a heteroatom or a hydrocarbyl group which may contain heteroatoms; R2, R3, R4, R5, R6, R7, R8 and R9 independently are hydrogen, or a hydrocarbyl group which may contain heteroatoms; or at least two of said R2, R3, R4, R5, R6, R7, R8 and R9 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); also 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.