Benzil Voltage Stabilizer for Polyolefin Cable Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polyolefin compositions used in medium, high, and extra high voltage cables face challenges in achieving sufficient electrical breakdown strength, as existing voltage stabilizers either increase costs significantly or have limitations in solubility, migration tendency, and compatibility with cross-linking agents.
Innovation Solution
A polyolefin composition incorporating a benzil derivative with specific hydrocarbyl substituents is used as a voltage stabilizer, enhancing electrical breakdown strength, solubility, and compatibility with cross-linking agents, while maintaining low migration tendency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing voltage stabilizers are used to increase electrical breakdown strength, then electrical breakdown strength is improved, but cost increases significantly
Solution Approach 1:
The patent modifies the chemical structure of benzophenone-based voltage stabilizers by introducing specific hydrocarbyl substituents (alkyl, aryl, alkoxy, or aryloxy groups) at defined positions (R1-R10) with specific constraints (at least one R group must be a hydrocarbyl group). This structural parameter change optimizes the stabilizer's performance-to-cost ratio while maintaining electrical breakdown strength improvement.
Solution Approach 2:
The patent discards the need for expensive existing voltage stabilizers by recovering and optimizing the benzophenone structure with cost-effective hydrocarbyl substituents, achieving comparable or superior performance at lower cost.
2Reliability
If voltage stabilizer compounds with low ionisation potential are used to decrease energy of high energy electrons, then electrical breakdown strength is improved, but solubility in polyolefin matrix decreases
Solution Approach 1:
The patent adjusts the ionisation potential parameter of the voltage stabilizer by selecting specific hydrocarbyl substituents with appropriate electron-donating or electron-withdrawing characteristics. This balances the need for low ionisation potential (for electrical breakdown strength) with adequate solubility in the polyolefin matrix.
Solution Approach 2:
The patent creates a composite molecular structure combining the benzophenone core with hydrocarbyl substituents that are chemically compatible with polyolefin matrices, achieving a balance between electronic properties (low ionisation potential) and compatibility (solubility).
3Reliability
If voltage stabilizer compounds are used to improve electrical breakdown strength, then electrical breakdown strength is improved, but migration tendency increases
Solution Approach 1:
The patent modifies molecular weight and structural complexity parameters by introducing bulky hydrocarbyl substituents (especially aryl and long-chain alkyl groups). These structural changes reduce migration tendency while maintaining the low ionisation potential needed for electrical breakdown strength.
4Reliability
If voltage stabilizer is used in cross-linked polyolefin composition, then electrical breakdown strength is improved, but compatibility with cross-linking agents decreases
Solution Approach 1:
The patent selects hydrocarbyl substituents that are chemically inert toward common cross-linking agents (peroxides, silanes, isocyanates). This parameter selection ensures the voltage stabilizer maintains its functionality during and after the cross-linking process without degradation or unwanted side reactions.
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 composition significantly improves electrical breakdown strength, as evidenced by high molal voltage stabilization values, and is compatible with other components, making it suitable for high voltage cable insulation.
Implementation Method 1
the compounds must have a low ionisation potential to decrease the energy of high energy electrons and hence increase the electrical breakdown strength efficiently
Data Source
AI summary
Disclosed is a polyolefin composition comprising (i) a polyolefin (A), (ii) a benzil derivative (B) comprising the structural unit according to the following formula (I), wherein one or more of the carbon atoms in the phenyl rings to which residue R1, R2, R3, R4, R5, R6, R7, R8, R9 or R10 is attached may also be a heteroatom; R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 independently 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 form a further aromatic or non-aromatic ring and such system has one to eight substituents, R1′ to R8′, and n=2 to 9; with the proviso that at least one hydrocarbyl group is present.