Benzophenone Voltage Stabilizer for Polyolefin Cable Insulation
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Solution Overview
Problem
Current polyolefin compositions used in medium, high, and extra high voltage cables face limitations in electrical breakdown strength, despite the use of clean 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 benzophenone derivative with amine groups as substituents is used as a voltage stabilizer, enhancing the electrical breakdown strength of polyolefin compositions by improving solubility and compatibility with cross-linking agents, while maintaining low migration tendency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If super clean materials are used for insulation, 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 the electrical breakdown strength of the insulation material. These compounds act as mediators between the base polyolefin material and the electrical stress, providing protection without requiring ultra-clean material processing. The voltage stabilizers absorb and dissipate electrical energy, preventing breakdown while being cost-effective compared to super clean material production.
Solution Approach 2:
The patent changes the chemical composition parameters of the insulation material by incorporating specific voltage stabilizer compounds (polyhalopolyphenyls, nitro-group containing aromatics, or benzophenone derivatives) into the polyolefin matrix. This parameter change transforms the electrical properties of the material, significantly improving breakdown strength through chemical enhancement rather than relying solely on physical purity.
2Reliability
If active voltage stabiliser additives are used, then electrical breakdown strength is improved, but compatibility with cross-linking agents may be compromised
Solution Approach 1:
The patent applies local quality by selecting voltage stabilizer compounds with specific local chemical characteristics (functional groups such as polyhalo, nitro, or benzophenone structures) that are compatible with cross-linking agents at the molecular level. These locally optimized chemical structures ensure that the stabilizers do not interfere with the cross-linking process while still providing electrical breakdown protection.
Solution Approach 2:
The patent creates a composite material system where voltage stabilizer compounds are integrated into the polyolefin matrix in a way that maintains compatibility with cross-linking agents. The composite structure allows multiple functions to coexist: the base polymer provides structural integrity, the voltage stabilizers provide electrical protection, and the cross-linking agents provide thermal and mechanical stability, all working together without mutual interference.
3Reliability
If voltage stabiliser compounds with low ionisation potential are used, then electrical breakdown strength is improved, but migration tendency may increase
Solution Approach 1:
The patent extracts or selects voltage stabilizer compounds with specific molecular weight ranges and structural characteristics that balance low ionization potential with low migration tendency. By carefully selecting compounds that are neither too small (which would migrate easily) nor too large (which would not effectively stabilize), the patent achieves optimal performance. The structural complexity of the selected compounds (multiple rings, functional groups) provides sufficient molecular size to reduce migration while maintaining electrical stability.
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 benzophenone derivative significantly improves the electrical breakdown strength of polyolefin compositions, as evidenced by high molar field stability values, and is compatible with other components, including cross-linking agents, thereby enhancing the reliability of cable insulation.
Implementation Method 1
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 (i) a polyolefin (A), (ii) a benzophenone derivative (B) comprising the, preferably consisting of 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, such as N, in which case the respective residue R1, R2, R3, R4, R5, R6, R7, R8, R9 or R10 is not present; 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 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 wherein the ring system of formula (I) with said at least one fused further ring may further bear one to eight substituents, R1′ to R8′ each of which are independently selected from said same groups as R1 to R10; and n=1 to 10; with the proviso that (i) at least one of said R1, R2, R3, R4, R5, R6, R7, R8, R9 or R10, or if present, at least one of said R1′ to R8′, is a hydrocarbyl group which may contain heteroatoms and which contains an amine group.