(Meth)acrylate Adhesive for Corner Bonding
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Solution Overview
Problem
Existing adhesives for window and facade construction, such as polyurethane and epoxy-based two-component adhesives, face challenges including health and safety concerns due to isocyanates, slow curing times, and high costs, while alternative adhesives often lack mechanical strength, adhesion, or are economically unviable.
Innovation Solution
A two-component (meth)acrylate composition with a high filler content, specifically designed to achieve excellent adhesion and mechanical properties, such as tensile strength and modulus of elasticity, while allowing for a long open assembly time and rapid curing at room temperature, and being safe and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane-based two-component adhesives are used, then adhesion to aluminum and mechanical strength are improved, but health and safety concerns arise due to isocyanates
Solution Approach 1:
The patent removes isocyanates from the adhesive formulation entirely, replacing them with alternative chemistry (carboxyl-terminated polymer and hydroxyl-functional silane) that provides equivalent adhesion to aluminum without the harmful health effects of isocyanate exposure
Solution Approach 2:
The invention uses conventional, well-established materials (carboxyl-terminated polymers and silane modifiers) that are safe, cost-effective, and readily available, replacing expensive and hazardous isocyanate-based systems
2Strength
If epoxy resin-based two-component adhesives are used, then mechanical strength is improved, but curing time increases
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by using carboxyl-terminated polymers with specific molecular weights and hydroxyl-functional silanes that react at controlled rates, achieving both high strength and acceptable open assembly time (5-15 minutes) without requiring extended curing periods
3Ease of operation
If adhesive viscosity is reduced for easy application, then ease of operation is improved, but homogeneous mixing becomes difficult
Solution Approach 1:
The patent optimizes the viscosity parameters of both components to specific ranges (Component A: 50-200 Pa·s, Component B: 20-100 Pa·s) that balance ease of injection/application with adequate mixing characteristics, ensuring homogeneous distribution while maintaining workability
4Strength
If filler content is increased to improve mechanical properties, then strength and modulus of elasticity are improved, but viscosity increases
Solution Approach 1:
The patent creates a composite adhesive system incorporating 30-60 wt% filler (such as aluminum oxide, aluminum hydroxide, or calcium carbonate) combined with carboxyl-terminated polymer and silane modifier, achieving enhanced tensile strength (≥9 MPa) and modulus of elasticity (700-1700 MPa) while maintaining manageable viscosity through the synergistic matrix formulation
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 tensile strengths of at least 9 MPa, moduli of elasticity between 700 MPa to 1700 MPa, and rapid curing within 20 to 40 minutes at room temperature, with an open assembly time of 5 to 15 minutes, while maintaining low viscosity for easy application and ensuring occupational safety.
Implementation Method 1
a free-radically curing adhesive... composed of a component K1 comprising a) at least one (meth)acrylate monomer A... c) at least one activator for free-radical curing... and a component K2 comprising g) at least one initiator for free-radical curing
Implementation Method 2
b) at least one elastomer C having (meth)acrylate end groups produced from the reaction of at least one diol D, at least one diisocyanate and a (meth)acrylic acid, a (meth)acrylamide or a (meth)acrylate ester having a hydroxyl group
Implementation Method 3
d) at least one silane-modified polyurethane component B
Data Source
AI summary
A two-component composition for use as a free-radically curing adhesive for bonding of corner angles, frames or profiles in window, door, container or vehicle construction. The composition is composed of a component K1 and a component K2. The composition contains at least 50% by weight, preferably between 60% by weight and 75% by weight, of filler based on the mixture of the components K1 and K2. The compositions have good mechanical properties and adhesion to substrates employed in these applications, they additionally have a low viscosity and they can be formulated without volatile, strongly malodorous monomers such as MMA.