Silane-Modified Poly(Meth)Acrylate Adhesive for Isocyanate-Free Bonding
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Solution Overview
Problem
Conventional polyurethane-based adhesives exhibit health and safety concerns due to residual isocyanates, UV instability, and require a priming step, while silane-modified polymers lack comparable bond strength and elongation.
Innovation Solution
A curable composition comprising silane-modified poly(meth)acrylate, surface-treated calcium carbonate, aminosilane, and optional silane-modified polyether, with a catalyst and plasticizer, offering excellent mechanical properties, UV stability, and no priming requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurethane-based adhesives are used, then excellent mechanical properties and reliability are achieved, but health and safety concerns arise due to residual isocyanates and UV stability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by using silane-modified poly(meth)acrylate instead of polyurethane, eliminating isocyanates while maintaining mechanical properties through silane crosslinking chemistry that provides similar bond strength and flexibility
Solution Approach 2:
The invention creates a composite adhesive system combining silane-modified poly(meth)acrylate with inorganic fillers (calcium carbonate, silica) and aminosilane coupling agents, achieving both excellent mechanical properties and UV stability through the synergistic combination of organic polymer matrix and inorganic reinforcement
2Object-affected harmful factors
If silane-modified polymers are used, then health safety improves by eliminating isocyanates and UV stability increases, but bond strength and elongation are insufficient
Solution Approach 1:
The invention enhances the inherently weak mechanical properties of silane-modified polymers by incorporating inorganic fillers (calcium carbonate, silica) that provide reinforcement, and aminosilane coupling agents that improve interfacial adhesion between the polymer matrix and fillers, achieving bond strength comparable to polyurethane
Solution Approach 2:
The invention applies local quality enhancement by using surface-treated calcium carbonate and silica particles with specific surface treatments that create localized reinforcement zones, improving overall mechanical strength and elongation of the adhesive system
3Reliability
If polyurethane-based adhesives are used, then mechanical reliability is achieved, but additional processing steps are required including priming
Solution Approach 1:
The invention changes the surface interaction parameters by incorporating aminosilane coupling agents that provide inherent adhesion promotion, eliminating the need for separate priming steps while maintaining excellent bond strength through the reactive amino groups that form strong bonds with 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 composition achieves high bond strength, elongation, and UV tolerance, with a safe and efficient curing process, suitable for bonding and sealing applications in industries like rail and automotive.
Implementation Method 1
at least one aminosilane
Implementation Method 2
at least one aminosilane
Implementation Method 3
silane-modified poly(meth)acrylate
Implementation Method 4
at least one catalyst
Data Source
AI summary
The invention relates to a curable composition comprisingI. at least one silane-modified poly(meth)acrylate,II. surface treated calcium carbonate,III. at least one aminosilane,IV. optionally at least one silane-modified polyetherV. optionally surface treated silica,VI. optionally, at least one catalyst,VII at least one plasticizer having a molecular weight of less than 350 g/mol, preferably of less than 300 g/mol, more preferably of less than 250 g/mol, in particular of less than 200 g/mol.The invention also relates to adhesive, sealant, and/or coating materials comprising said composition and the use of said composition.