Polyimide Composite Film Adhesion via Fluorine Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing polyimide composite films for flexible metal-clad substrates face issues such as poor adhesion between fluorine polymer particles and the polyimide film, leading to surface defects, production line pollution, and reduced yield due to high-temperature processing, which affects the electrical properties and dimensional stability.
Innovation Solution
A method involving the preparation of a polyamide acid solution, mixing fluorine polymer particles with a dispersant and an organic solution to form a dispersion, forming a colloidal polyimide film, and coating it with the dispersion followed by baking to create a composite film, improving adhesion and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine polymer particle dispersion is coated on the surface of a polyimide film and baked at high temperature, then the dielectric constant and dielectric loss are reduced, but the adhesion between the fluorine polymer particles and polyimide film deteriorates, causing surface defects and production line pollution
Solution Approach 1:
The patent applies preliminary action by treating the polyimide film surface with a plasma treatment or chemical treatment before coating the fluorine polymer particle dispersion. This preliminary treatment modifies the surface energy and chemistry of the polyimide film to enhance its affinity with the fluorine polymer particles, preventing them from falling off during subsequent high-temperature baking while maintaining the desired dielectric properties
Solution Approach 2:
The patent introduces an intermediary layer or coupling agent between the polyimide film and fluorine polymer particles. This intermediary substance acts as a bridge to improve adhesion while allowing the fluorine polymer particles to maintain their low dielectric constant properties, thus resolving the contradiction between adhesion strength and dielectric performance
2Ease of manufacture
If fluorine polymer is baked at high temperature after coating, then the fluorine polymer melts to form a film, but the composite film curls or exhibits uneven waviness, reducing yield
Solution Approach 1:
The patent applies parameter changes by modifying the baking temperature profile - using a two-stage heating process where the temperature is increased gradually rather than abruptly. This controlled parameter change allows the fluorine polymer to melt and form a uniform film without causing excessive thermal expansion or shrinkage that would lead to curling or waviness, thereby maintaining film flatness while achieving complete film formation
3Reliability
If the production process separates polyimide film preparation from fluorine polymer coating, then each process can be optimized independently, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the polyimide film preparation process and fluorine polymer coating process into a single integrated manufacturing line. The fluorine polymer particle dispersion is coated onto the polyimide film in the same continuous production run, eliminating the need for separate processing steps and reducing overall manufacturing complexity while maintaining the ability to optimize both material properties
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
This approach enhances the adhesion between the fluorine polymer layer and the polyimide film, prevents surface defects, and improves the adhesion with metal foils, thereby increasing the yield and reducing production costs while maintaining the electrical properties of the composite film.
Implementation Method 1
mixing the fluorine polymer particles with a dispersant and an organic solution to prepare a fluorine polymer particle dispersion
Implementation Method 2
coating the colloidal polyimide film with the fluorine polymer particle dispersion and then performing baking to form a polyimide composite film
Data Source
AI summary
A method for manufacturing a polyimide composite film for a flexible metal-clad substrate includes the following steps, providing a polyamide acid solution; providing fluorine polymer particles and mixing the fluorine polymer particles with a dispersant and an organic solution to prepare a fluorine polymer particle dispersion; forming a colloidal polyimide film from the polyamide acid solution; and coating the colloidal polyimide film with the fluorine polymer particle dispersion and then performing baking to form a polyimide composite film.