Fluororesin Base Material with Siloxane Modified Layer
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Solution Overview
Problem
Conventional fluororesin base materials have poor adhesion strength due to their surface-modified state being unstable, which affects the durability of metal layers and coatings on printed wiring boards, requiring additional treatments and increasing manufacturing complexity.
Innovation Solution
A fluororesin base material with a modified layer containing siloxane bonds and hydrophilic organofunctional groups, providing a stable surface with a contact angle of 90° or less, enhancing adhesion and maintaining stability even after treatments like etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plasma treatment is applied to fluororesin base material to improve adhesion, then adhesion strength is improved, but surface-modified state stability deteriorates
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the fluororesin base material and the metal layer. The silane coupling agent forms a siloxane bond with the fluororesin surface and provides hydrophilic organofunctional groups that enhance adhesion, while the siloxane bond structure maintains long-term stability of the surface-modified state.
Solution Approach 2:
The surface of the fluororesin base material is transformed into a composite structure containing both siloxane bonds (for stability) and hydrophilic organofunctional groups (for adhesion). This composite surface layer combines the beneficial properties of both chemical structures to achieve simultaneous adhesion improvement and stability maintenance.
2Reliability
If conventional fluororesin base material is used, then chemical resistance and heat resistance are maintained, but adhesion strength to other members deteriorates
Solution Approach 1:
The fluororesin base material is modified only at its surface region while maintaining the bulk material properties. The surface is treated with a silane coupling agent to provide adhesion-promoting functional groups, while the interior fluororesin structure retains its inherent chemical and heat resistance properties.
3Strength
If additional surface treatments are performed to improve adhesion, then adhesion strength is improved, but manufacturing complexity increases
Solution Approach 1:
The surface treatment process is merged with the existing manufacturing workflow by applying the silane coupling agent during the metal layer formation process. This integration eliminates the need for separate, complex surface treatment steps while achieving improved adhesion strength.
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 modified fluororesin base material achieves higher adhesion strength and stability, reducing peeling issues and improving high-frequency characteristics by maintaining surface activity over time, thus enhancing the reliability and performance of printed wiring boards and circuit modules.
Implementation Method 1
the modified layer containing a siloxane bond and a hydrophilic organofunctional group, and a surface of the modified layer having a contact angle of 90° or less with pure water
Data Source
AI summary
A fluororesin base material containing a fluororesin as a main component includes a modified layer on at least a partial region of a surface thereof, the modified layer containing a siloxane bond and a hydrophilic organofunctional group, and a surface of the modified layer having a contact angle of 90° or less with pure water.