Silane-Epoxy Adhesive Composition for Strength and Elongation
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Solution Overview
Problem
Existing adhesives and coatings based on polyurethanes or epoxy resins face limitations in strength, elongation, and resistance to corrosive environments, particularly in bonding battery boxes in electric vehicles and exposure to saltwater or glycol/water mixtures.
Innovation Solution
A composition combining a silane-containing polymer with a silicon content of 0.6 to 2 wt%, derived from the reaction of an isocyanate-containing polymer and aminosilane, mercaptosilane, or hydroxysilane, with an epoxy resin and polyamine, which cures quickly at room temperature and exhibits high strength, elongation, and resistance to corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyurethane-based materials are used, then high elongation is achieved, but strength and resistance to glycol/water mixtures are limited
Solution Approach 1:
The invention uses a composite material system combining polyol with both isocyanate and silane groups, creating a hybrid polymer structure that integrates the elongation benefits of polyurethane with the strength and chemical resistance of silane crosslinked networks. This composite approach allows simultaneous achievement of high elongation and high strength properties.
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating silane groups into the polymer structure and controlling the silicon content within a specific range (0.6-2 wt%). This parameter optimization enables the material to achieve both high elongation and high strength while maintaining resistance to glycol/water mixtures.
2Strength
If epoxy-based materials are used, then very high strength and adhesion are achieved, but elongation is limited
Solution Approach 1:
The invention creates a composite material system that combines epoxy resin with silane-functional polyol and isocyanate components. This composite structure integrates the high strength and adhesion of epoxy with the flexibility and elongation of polyol-based segments, achieving both properties simultaneously.
Solution Approach 2:
The invention introduces local quality variations by incorporating silane groups at specific positions within the polymer chain and controlling their distribution. This allows different regions of the material to exhibit different properties - high strength from epoxy crosslinking and high elongation from flexible polyol segments.
3Strength
If MS polymers are combined with epoxy resins, then strength is improved, but only very limited strengths can be achieved
Solution Approach 1:
The invention changes the chemical parameters by incorporating both isocyanate and silane groups into the polyol structure, creating a more densely crosslinked network with optimized silicon content (0.6-2 wt%). This parameter optimization significantly enhances both strength and resistance to glycol/water mixtures compared to conventional MS polymer-epoxy combinations.
Solution Approach 2:
The invention uses a composite material approach combining epoxy resin with silane-functional polyol that contains both isocyanate and silane groups. This creates a multi-functional crosslinked network that simultaneously achieves high strength and excellent resistance to glycol/water mixtures through synergistic interactions between different crosslinking mechanisms.
4Reliability
If silane-functional polymers with low silicon content are used, then adhesion to aluminum under corrosive conditions is achieved, but significantly higher strengths are required
Solution Approach 1:
The invention optimizes the silicon content parameter within a specific range (0.6-2 wt%) to achieve the right balance between adhesion and strength. This controlled silicon content ensures sufficient adhesion to aluminum under corrosive conditions while simultaneously achieving significantly higher strength values through enhanced crosslinking density from the dual isocyanate-silane functionality.
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 forms tough-elastic adhesives and coatings with high adhesive strength, tear resistance, and resistance to glycol/water mixtures, even on wet or damp substrates, protecting metals from corrosion without pretreatment and allowing for durable repairs on surfaces like concrete, asphalt, or bitumen.
Implementation Method 1
A composition comprising at least one silane group-containing polymer with a silicon content in the range of 0.6 to 2 wt%, obtained from the reaction of at least one isocyanate group-containing polymer and at least one amino-, mercapto- or hydroxysilane, at least one epoxy liquid resin and at least one polyamine with at least three amine hydrogens reactive towards epoxy groups
Implementation Method 2
which cures quickly at room temperature and exhibits high strength, elongation, and resistance to corrosion
Data Source
AI summary
The invention relates to a composition comprising: – at least one silane group-containing polymer with a silicon content ranging from 0.6 to 2 wt.%, obtained by reacting at least one isocyanate group-containing polymer and at least one amino-, mercapto-, or hydroxysilane, – at least one liquid epoxy resin, and – at least one polyamine with at least three amine hydrogens which are reactive towards epoxy groups. The composition facilitates adhesives, coatings, or sealing compounds with a good storage stability, a fast curing time, even in the event of moisture or humidity, a surprisingly high degree of strength while having a high degree of elasticity, a high degree of resistance against further tearing, a high degree of resistance in particular against glycol/water mixtures, and a high degree of adhesion to many substrates. When used on metals such as steel or aluminum, the composition protects same against corrosion.