Curable Silane Composition for Adhesion and Flexibility
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Solution Overview
Problem
Curable compositions with high concentrations of silanes are brittle and have unfavorable mechanical properties, such as high modulus of elasticity, which affects their longevity and adhesion to various substrates.
Innovation Solution
A curable composition with a water content of 400 ppm to 1000 ppm, containing a primary silane C and a secondary or tertiary silane D, where the silane C has higher reactivity than silane D, and the polymer includes hydrolyzable organyl-oxy-silyl groups, improving adhesion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher concentrations of silanes are used to improve adhesion, then adhesion to substrates is improved, but the elastic modulus becomes unfavorably high and the cured product becomes brittle
Solution Approach 1:
The patent changes the chemical parameters of the silane system by introducing a multifunctional silane with amino groups that reacts differently with the polymer and water compared to conventional silanes. This parameter change allows achieving adhesion promotion without the high elastic modulus associated with traditional high-concentration silane systems
Solution Approach 2:
The patent creates a composite curing system where the multifunctional silane works synergistically with the polymer containing hydrolyzable organyl oxysilyl groups. This composite approach produces a cured product with combined properties: good adhesion from the silane and acceptable mechanical properties from the polymer matrix
2Reliability
If higher concentrations of silanes are used to improve adhesion, then adhesion to substrates is improved, but the cured product becomes brittle which negatively impacts durability
Solution Approach 1:
The introduction of amino groups in the silane structure changes the chemical reactivity parameters, enabling the silane to form flexible bonds with the polymer while maintaining strong adhesion. This parameter modification prevents brittleness and improves long-term durability
Solution Approach 2:
The multifunctional silane acts as an intermediary between the substrate and the polymer matrix, providing both adhesion promotion and flexibility. The amino groups in the silane serve as mediators that can interact with both the substrate and the polymer, preventing the brittleness that would otherwise result from high silane concentration
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 low modulus of elasticity, high elastic resilience, and excellent adhesion to substrates, ensuring longevity and problem-free processing with stable mechanical properties over time.
Implementation Method 1
In the presence of atmospheric moisture, these polymers condense together, releasing their organyl oxy groups
Implementation Method 2
silane C and/or silane D act as a drying agent, binding or removing water from the curable composition through reaction
Data Source
AI summary
Curable composition based on at least one polymer, which polymer has at least one hydrolyzable organyl-oxy-silyl group, wherein the composition has at least one silane C with a formula selected from the group "R1R2N-(CH2)a-(CR3R4)b-(CH2)c-SiR53-d(OR6)d, R1R2N-(CH2)a-(CR3R4)b-(CH2)c-SiR5(OR6)(OR6'), R1R2N-(CH2)a-(CR3R4)b-(CH2)c-Si(OR6)(OR6")(OR6")". The substituent R6 and/or R6' and/or R6" of the silane C is selected from the group "alkyl group of the formula -CnH2n+1, alkoxyalkyl group of the formula -CnH2n-O-CnH2n+1, alkoxyalkyl group of the formula -CnH2n-O-Cn+1H2n+3".The composition includes at least one silane D different from silane C, with a formula selected from the group "R7R8N-(CH2)f-(CR9R10)g-(CH2)h-SiR113-i(OR12)i, R7R8N-(CH2)f-(CR9R10)g-(CH2)h-SiR11(OR12)(OR12'), R7R8N-(CH2)f-(CR9R10)g-(CH2)h-Si(OR12)(OR12')(OR12")", wherein silane C is a primary (1°) and silane D is a secondary (2°) or tertiary (3°) amine, and/or wherein the index d is greater than or equal to the index i, or that the substituent R12 and/or R12' and/or R12" of silane D is each from the group "alkyl group of the formula -Cn+1H2n+3, alkyl alkoxy residue with the formula -Cn+1H2n+2-O-CnH2n+1, alkoxyalkyl residue with the formula -Cn+1H2n+2-O-Cn+1H2n+3, alkoxyalkyl residue with the formula -CnH2n-O-Cn+2H2n+5" is selected.