Acrylic Structural Adhesive Composition for Vertical Bonding
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Solution Overview
Problem
Structural adhesives often face challenges in achieving a balance between mechanical strength and elasticity, particularly when used on metals and composite materials, and they tend to flow excessively on vertical surfaces due to gravity, complicating applications and increasing construction time.
Innovation Solution
A composition comprising methacrylate monomers, elastomeric block copolymers, functionalized elastomers, and core-shell particles is used, which provides high elongation at break and tensile shear strength, while maintaining high viscosity to prevent flow on vertical surfaces until polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the adhesive's elasticity is increased to prevent breakage under pulling forces, then the bond becomes more flexible and resistant to deformation, but the mechanical strength (particularly shear strength) decreases
Solution Approach 1:
The adhesive uses a composite formulation combining multiple polymer components (epoxy resin, polyester resin, and flexible polymer) to achieve both high elasticity and high mechanical strength simultaneously, resolving the trade-off between flexibility and strength
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of flexible polymers and cross-linking agents, changing the material properties to achieve both high elongation at break and high shear strength
2Stability of the object's composition
If the adhesive viscosity is increased to prevent slippage on vertical surfaces, then the adhesive can be applied over long distances without running, but the application process becomes more difficult and build time increases
Solution Approach 1:
The patent optimizes the viscosity parameter within a specific range (500-5000 cP) to balance non-slippage performance on vertical surfaces with ease of application, avoiding excessive viscosity that would complicate the manufacturing process
3Strength
If the adhesive is formulated for high mechanical strength bonding, then the bond can withstand high loads, but the elongation at break decreases making the bond rigid and prone to failure under deformation
Solution Approach 1:
The adhesive employs a composite polymer system combining rigid epoxy resin for strength with flexible polyester resin and flexible polymer to maintain high elongation at break (≥80%) while achieving high tensile shear strength (≥10 MPa)
Solution Approach 2:
The patent adjusts the chemical composition parameters including the ratio of flexible to rigid polymer components to simultaneously achieve high tensile shear strength and high elongation at break, preventing the rigid-brittle behavior
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 elongation at break greater than 80% and tensile shear strength greater than 10 MPa, allowing for effective bonding on various materials with reduced flow and improved application on vertical surfaces, enhancing manufacturing efficiency and mechanical performance.
Implementation Method 1
The present invention relates to a composition usable in a structural adhesive (a) at least one methacrylate monomer, (b) at least one elastomeric block copolymer containing styrene and at least one second monomer, (c) at least one elastomer selected from polybutadiene, polyisoprene and polychloroprene, (d) particles formed of a thermoplastic shell and an elastomeric core
Data Source
AI summary
The invention relates to a composition for an acrylic structural adhesive containing a mixture of block copolymers, of elastomer and of elastomeric polymer particles.