Cable Insulator Resin Composition for Impedance and Permittivity Control
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Solution Overview
Problem
Existing communication cables for automotive applications face challenges in controlling the permittivity of insulator materials to achieve the required characteristic impedance for high-speed communication, as permittivity is an inherent property of the material composition, making it difficult to adjust while meeting reliability standards.
Innovation Solution
A resin composition comprising 51 to 85 parts by mass of polyolefin resin, 15 to 49 parts by mass of flexible resin, 10 to 80 parts by mass of halogenated flame retardant, and at least one of titanium oxide or metal hydroxide, with a permittivity of 2.5 to 3.5, is used as an insulator material to control the characteristic impedance and ensure reliability in communication cables and wire harnesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional insulator materials are used, then material reliability is ensured, but permittivity cannot be adjusted to achieve required characteristic impedance
Solution Approach 1:
The patent uses a composite material system consisting of polyolefin resin as the base material, flexible resin for permittivity adjustment, halogenated flame retardant for safety, and inorganic fillers (titanium oxide or metal hydroxide) for additional permittivity control. This multi-component composite allows independent optimization of each property: the polyolefin provides structural reliability, while the flexible resin and inorganic fillers enable precise permittivity tuning to achieve the required 90-110Ω characteristic impedance range.
Solution Approach 2:
The patent systematically adjusts the composition ratios of flexible resin (15-49 parts by mass) and inorganic fillers (10-80 parts by mass) to control the permittivity of the insulator material. By varying these parameters within specified ranges, the permittivity can be tuned to achieve the target characteristic impedance while maintaining all other required properties such as flame retardancy, low-temperature resistance, and abrasion resistance.
2Manufacturing precision
If permittivity is adjusted to control characteristic impedance, then communication characteristics are improved, but material reliability may be compromised
Solution Approach 1:
The composite material design allows decoupling of conflicting requirements: polyolefin resin (51-85 parts by mass) provides the reliable base material with proven automotive-grade performance, while flexible resin and inorganic fillers are added in controlled amounts to adjust permittivity without compromising the fundamental reliability provided by the polyolefin matrix. The halogenated flame retardant (10-80 parts by mass) ensures safety standards are met.
Solution Approach 2:
Different components of the composite material serve specialized functions: the polyolefin resin provides structural integrity and baseline reliability, the flexible resin locally adjusts permittivity properties, the inorganic fillers provide additional permittivity control and flame retardancy, and the halogenated flame retardant ensures fire safety. This functional differentiation allows each component to optimize its specific property without negatively affecting overall material reliability.
3Manufacturing precision
If multiple additives are used to adjust permittivity, then characteristic impedance is controlled, but manufacturing complexity increases
Solution Approach 1:
The patent employs a standardized composite material framework with four well-defined components and specified mass ratio ranges. This structured approach simplifies manufacturing by providing clear formulation guidelines: polyolefin resin (51-85 parts), flexible resin (15-49 parts), halogenated flame retardant (10-80 parts), and inorganic fillers. The defined ranges allow manufacturers to adjust permittivity within specifications without needing to develop entirely new material systems, reducing overall manufacturing complexity.
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 resin composition effectively adjusts permittivity to meet the required characteristic impedance range of 90 to 110Ω, enhancing the reliability and durability of automotive electric wires while maintaining low-temperature resistance and abrasion resistance, thus satisfying the standards for automotive communication cables.
Implementation Method 1
it is necessary to adjust the permittivity of the insulator material to an appropriate value... the resin composition having a permittivity of 2.5 to 3.5
Data Source
AI summary
A communication cable includes 51 to 85 parts by mass of a polyolefin resin, 15 to 49 parts by mass of a flexible resin, 10 to 80 parts by mass of a halogenated flame retardant per 100 parts by mass of a total of the polyolefin resin and the flexible resin, and at least one of titanium oxide or metal hydroxide, the resin composition having a permittivity of 2.5 to 3.5.