PTFE Composite with Low Surface Energy Fillers
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Solution Overview
Problem
Electronic circuit boards with high porosity or filled with a large amount of filler materials are prone to permeation by treatment liquids, leading to appearance failures and changes in characteristics, especially when exposed to high permeability liquids.
Innovation Solution
A plate-like composite material comprising polytetrafluoroethylene and porous inorganic fine particle aggregates with a critical liquid-repellent tension of 34.0 mN/m or less, achieved through specific surface modification and structure formation, ensuring the material's mechanical strength and low dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the porosity of the composite material is increased to reduce the dielectric constant, then the low-frequency signal loss is reduced, but the material becomes more permeable to treatment liquids causing appearance failures and characteristic changes
Solution Approach 1:
The invention changes the surface energy parameter of the filler particles by selecting specific inorganic materials (silicon oxide, aluminum oxide, titanium oxide, zirconium oxide) with inherent low surface energy. This parameter change creates liquid-repellent properties that prevent treatment liquid permeation while maintaining the high porosity (35-80%) needed for low signal loss.
Solution Approach 2:
The invention creates a composite material system combining polytetrafluoroethylene matrix with specific inorganic filler particles. The composite structure leverages the nonpolar nature of PTFE and the low surface energy inorganic fillers to achieve both high porosity for electrical performance and liquid repellency for chemical resistance.
2Strength
If a large amount of filler is added to improve dimensional stability and strength, then the mechanical properties are enhanced, but the material becomes more susceptible to treatment liquid permeation
Solution Approach 1:
The invention changes the surface energy parameter of the filler particles by selecting specific inorganic materials (silicon oxide, aluminum oxide, titanium oxide, zirconium oxide) with inherent low surface energy. This parameter change creates liquid-repellent properties that prevent treatment liquid permeation while maintaining the high porosity (35-80%) needed for low signal loss.
Solution Approach 2:
The invention converts the typically harmful effect of high filler content (increased permeability) into a beneficial property by selecting inorganic fillers with inherently low surface energy. The same high filler content that would normally increase permeability instead creates liquid-repellent properties when using these specific materials.
3Reliability
If the critical liquid-repellent tension is reduced to prevent treatment liquid permeation, then the resistance to liquid penetration is improved, but the material composition becomes more complex
Solution Approach 1:
The invention changes the surface energy parameter of the filler particles by selecting specific inorganic materials (silicon oxide, aluminum oxide, titanium oxide, zirconium oxide) with inherent low surface energy. This parameter change creates liquid-repellent properties that prevent treatment liquid permeation while maintaining the high porosity (35-80%) needed for low signal loss.
Solution Approach 2:
The invention achieves homogeneous distribution of the inorganic filler particles within the polytetrafluoroethylene matrix. The uniform dispersion ensures consistent liquid-repellent properties throughout the material without requiring complex multi-layer structures or surface treatments.
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 composite material effectively prevents permeation by treatment liquids, maintaining its characteristics and mechanical strength, making it suitable for electronic circuit boards, especially in high-frequency applications.
Implementation Method 1
the composite material has a critical liquid-repellent tension determined by the following wetting tension test of 34.0 mN/m or less
Implementation Method 2
the composite material has a porosity of 35% or more
Data Source
AI summary
Provided is a composite material that shows a low specific dielectric constant, and that hardly causes an appearance failure or changes in characteristics when exposed to, for example, a treatment liquid to be used in the production of an electronic circuit board. Specifically, a plate-like composite material including polytetrafluoroethylene and a predetermined filler, and satisfying a predetermined condition serves as a composite material that shows a low specific dielectric constant, and that hardly causes an appearance failure or changes in characteristics even when exposed to, for example, a treatment liquid to be used in the production of an electronic circuit board.