Aromatic Film-Forming Composition for Metal-Resin Adhesion
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Solution Overview
Problem
Conventional coating film-forming compositions using silane coupling agents for improving metal-resin adhesion suffer from poor film formability and adhesion durability, especially against acids like hydrochloric acid, and require surface roughening or additional metal layers.
Innovation Solution
A coating film-forming composition containing a specific aromatic compound with an amino group and aromatic ring, combined with a polybasic acid and halide ions, which forms a stable film on metal surfaces without surface roughening, enhancing adhesion to resins and providing durability against acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional silane coupling agent compositions are used to form coating films on metal surfaces, then the process can be simplified by avoiding surface roughening, but the film formability and adhesion to resin are poor
Solution Approach 1:
The patent changes the chemical composition parameters of the coating film by incorporating specific aromatic compounds (such as melamine, triazine, or pyrimidine derivatives) alongside silane coupling agents. This compositional parameter change enables the film to form properly on metal surfaces while maintaining the simplified process advantage of avoiding roughening treatments.
2Ease of manufacture
If conventional silane coupling agent compositions are used to form coating films, then surface roughening can be avoided, but the adhesion durability against acids is insufficient
Solution Approach 1:
The patent creates a composite coating film system combining silane coupling agents with aromatic compounds (melamine, triazine, or pyrimidine derivatives). This composite material approach provides both the process simplicity of avoiding roughening and the enhanced adhesion durability against acids, as the aromatic compounds contribute to chemical stability and corrosion resistance.
3Reliability
If additional metal layers (e.g., tin-plated layer) are disposed to improve adhesion, then metal-resin adhesion can be enhanced, but the process complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for additional metal layers (such as tin-plated layers) by developing a coating film composition that directly provides sufficient adhesion between metal and resin. The aromatic compound-based coating film serves the adhesion function that would otherwise require separate metal layers, thereby reducing process complexity.
4Reliability
If surface roughening treatment is applied to metal, then adhesion can be improved, but the process complexity and time increase
Solution Approach 1:
The patent removes the surface roughening treatment step from the process by developing a coating film composition that achieves strong adhesion on as-received metal surfaces. The aromatic compound-based film forms a robust interface between metal and resin without requiring prior surface modification, thereby eliminating the time-consuming roughening process.
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 composition achieves excellent adhesion and durability between metals and resins, specifically copper or copper alloys, even in acidic environments, simplifying the joining process and improving the stability of metal-resin composites.
Implementation Method 1
a composition containing a specific aromatic compound has excellent film formability on a metal surface
Implementation Method 2
adhesion durability against acids, such as hydrochloric acid
Data Source
Figure 1~2
AI summary
The coating film-forming composition is a solution of pH 6 to 9 and includes an aromatic compound having an amino group and an aromatic ring in one molecule, a polybasic acid having two or more carboxy groups, and a halide ion. The content of polybasic acid in the coating film-forming composition is 0.05 to 10 times the content of aromatic compound, and the halide ion concentration is 5 to 600 mM. A coating film with excellent adhesion to a resin can be formed on a surface of a metal member by bringing the coating film-forming composition into contact with the surface of the metal member.