Nitrile-Silane Resin Compositions for Wet Adhesion
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Solution Overview
Problem
Conventional silanes, such as aminosilanes, provide insufficient wet adhesion of curable resin compositions to substrates like polymeric materials and zinc or zinc alloys, and solvent-based compositions, while moving away from environmental concerns.
Innovation Solution
Incorporating a nitrile silane, specifically cyanoalkylalkoxysilane, into curable resin compositions enhances adhesion, particularly wet adhesion, to polymeric and zinc-containing substrates, without using solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silanes such as aminosilanes are used to enhance adhesion, then dry adhesion is improved, but wet adhesion remains insufficient
Solution Approach 1:
The patent changes the chemical parameter of the silane additive by introducing a nitrile functional group (cyano group) to the silane structure. This specific chemical modification enables the silane to provide both dry adhesion enhancement and wet adhesion improvement, resolving the contradiction where conventional silanes only provide dry adhesion but fail to maintain adhesion after water immersion.
2Strength
If solvent-based compositions are used to improve adhesion, then adhesion performance is enhanced, but environmental concerns increase
Solution Approach 1:
The patent extracts and removes the solvent component from the composition entirely, developing a 100% solids formulation. This extraction eliminates the environmental harm associated with volatile organic compounds while maintaining adhesion performance through the optimized resin and silane additive system.
Solution Approach 2:
The patent creates a composite material system combining specific resin components with nitrile functionalized silane additives in a solvent-free formulation. This composite approach enables the composition to achieve effective adhesion without requiring volatile solvents, thus resolving the contradiction between adhesion performance and environmental impact.
3Strength
If conventional silanes are used for inorganic substrates, then adhesion to metals like aluminum is improved, but adhesion to zinc-containing substrates is ineffective
Solution Approach 1:
The patent develops a silane additive with nitrile functionality that provides universal adhesion enhancement across multiple substrate types including polymeric substrates, inorganic substrates, and specifically zinc-containing substrates. This multi-functional silane compound resolves the limitation where conventional silanes work for aluminum but fail on zinc-containing substrates.
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 nitrile silane additives significantly improve adhesion strength, achieving wet peel strengths up to 350% greater than conventional compositions on polyethylene terephthalate and Aluzinc substrates after immersion in water.
Implementation Method 1
the curable compositions with a nitrile silane provide enhanced adhesion, and particularly enhanced wet adhesion, to polymeric substrates and substrates that include zinc or zinc alloys
Implementation Method 2
a curable resin comprising a polymer that is reactive with water
Data Source
AI summary
A curable composition and substrate having adhered thereto a cured material formed from such compositions is shown and described herein. The curable composition comprises a curable resin and a nitrile silane. The inclusion of the nitrile silane in the curable composition has been found to enhance adhesion of curable compositions to substrates including to substrates that can be difficult to adhere to such as, for example, polymeric substrates and those that include zinc or zinc alloys.