Ionic Adhesive Compositions for Corrosion-Resistant Bonding
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Solution Overview
Problem
Certain adhesive compositions used on electrically conductive surfaces can cause corrosive effects, leading to undesired reactions and degradation of the substrates, particularly under conditions of high humidity and temperature.
Innovation Solution
The development of ionic compositions comprising cationic imidazolium compounds and anionic sulfonyl imide compounds, which are used as adhesive materials that minimize corrosion by forming a stable bond between substrates, allowing for selective de-bonding upon application of an electric potential, thus preventing corrosive degradation of electrically conductive surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions are used on electrically conductive surfaces, then adhesion is achieved, but corrosive effects occur leading to substrate degradation
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using ionic liquids with specific cations (imidazolium, pyridinium, ammonium) and anions (BF4-, PF6-, CF3SO3-). This chemical parameter change eliminates corrosive effects while maintaining adhesion strength, as evidenced by no perforation in aluminum foil tests after 1000 hours at 85°C/85% RH
Solution Approach 2:
The patent creates a composite adhesive system combining ionic liquid components with specific functional groups. The composite nature of the ionic liquid (cation + anion combination) provides both adhesion properties and corrosion resistance, achieving dual functionality that conventional single-material adhesives cannot provide
2Strength
If adhesive coatings are applied to electrically conductive surfaces, then substrates are joined, but pitting and dissolution occur under high humidity and temperature
Solution Approach 1:
The patent modifies environmental stability parameters by selecting ionic liquid components with specific molecular structures (R1-C1-C8 alkyl, R2-H or C1-C3 alkyl, R3-C1-C8 alkyl/alkenyl/alkoxyalkyl/arylalkyl). These structural parameters provide thermodynamic stability that prevents substrate degradation under harsh conditions of high humidity and temperature
Solution Approach 2:
The patent uses simple ionic liquid molecules with straightforward cation-anion structures that are chemically inert and stable. These molecular building blocks resist degradation themselves, thereby protecting the substrate from corrosion even in demanding environmental conditions
3Object-affected harmful factors
If ionic compositions are used as adhesive material, then corrosion is reduced, but selective de-bonding capability must be maintained
Solution Approach 1:
The patent replaces mechanical adhesion (which would require forceful separation) with electrostatic adhesion. The ionic liquid forms an electrically conductive bond that can be selectively de-bonded by applying an electric potential, substituting mechanical separation with an electrical control mechanism that is both easy to operate and maintains corrosion resistance
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 ionic compositions effectively reduce corrosion on electrically conductive surfaces, maintaining a stable bond under high humidity and temperature conditions for extended periods without causing pitting or dissolution, as demonstrated by the lack of perforation in aluminum foil tests and maintaining adhesion during accelerated aging tests.
Implementation Method 1
ionic compositions that include a cationic imidazolium compound and an anionic compound such as a sulfonyl imide compound
Implementation Method 2
Upon the application of an electric potential, the adhesive coating is de-bonded from one or both of the first and second substrates
Data Source
AI summary
The present disclosure generally relates to ionic compositions which may be used in or as an adhesive material for selectively adhering two items together. More particularly, but not exclusively, the present disclosure relates to ionic compositions that include a cationic imidazolium compound and an anionic compound such as a sulfonyl imide compound.