Two-Component Acrylate Adhesive for Fast Curing Without Bubbles
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Solution Overview
Problem
Conventional structural adhesives face issues such as bubble formation due to volatile monomer evaporation during curing, inadequate mechanical strength, and difficulty in high gap-filling with short curing times, along with unsatisfactory elongation, yield strength, and T-peel strength.
Innovation Solution
A two-component system comprising specific monomers like (meth)acrylic acid, C1-6-alkyl (meth)acrylate, cycloalkyl (meth)acrylate, and hydroxy-C1-6-alkyl (meth)acrylate, combined with toughening agents and impact modifiers, which suppress bubble formation and enhance mechanical properties like elongation, yield strength, and T-peel strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional structural adhesives use high volatile monomer content for fast curing, then curing speed is improved, but bubble formation occurs due to monomer evaporation
Solution Approach 1:
The patent changes the chemical composition parameters by using specific monomer combinations (at least three of: (meth)acrylic acid, C1-6 alkyl (meth)acrylate, cycloalkyl (meth)acrylate, hydroxy-C1-6 alkyl (meth)acrylate) with controlled volatility. This parameter change allows fast curing while suppressing bubble formation through the synergistic effect of the monomer blend.
Solution Approach 2:
The patent creates a composite adhesive system combining multiple monomer types with different properties. The composite formulation includes toughening agents and impact modifiers alongside the specific monomer mix, creating a multi-component system that achieves both fast curing and bubble suppression through the combined effects of all components.
2Strength
If conventional adhesives increase monomer content for better adhesion, then bonding strength is improved, but odor increases due to volatile evaporation
Solution Approach 1:
The patent changes the volatility parameters by selecting monomers with lower vapor pressures (cycloalkyl and hydroxy-substituted alkyl (meth)acrylates) while maintaining adequate bonding strength. This parameter substitution reduces odor-generating volatiles while preserving adhesion performance.
3Ease of operation
If conventional adhesives use single-component formulation for simplicity, then ease of use is improved, but mechanical strength becomes inadequate
Solution Approach 1:
The patent segments the adhesive system into two separate components that are mixed before application. This segmentation allows each component to be optimized for specific functions (one component providing monomers and toughening agents, the other providing crosslinking agents or catalysts), resulting in superior mechanical strength while maintaining ease of use through simple mixing.
4Productivity
If conventional adhesives use short curing time for productivity, then manufacturing efficiency is improved, but elongation and yield strength become unsatisfactory
Solution Approach 1:
The patent incorporates toughening agents and impact modifiers into the adhesive formulation before application. These preliminary additions ensure that the cured adhesive possesses adequate elongation and yield strength even when curing is completed in short times, as the toughening agents are already present to provide mechanical resilience during and after the curing process.
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 system provides fast-curing adhesives suitable for high gap-filling without boiling, with improved mechanical performance, including high elongation, yield strength, and T-peel strength, while maintaining low odor and ease of extrusion.
Implementation Method 1
The second component comprises a peroxide polymerization initiator
Implementation Method 2
the reaction of the first component and the second component after mixing results in a structural adhesive
Implementation Method 3
combined with toughening agents and impact modifiers, which suppress bubble formation
Data Source
AI summary
The invention relates to a two-component structural adhesive, i.e. to a two-component system of a first component and a second component spatially separated from one another, wherein the reaction of the first component and the second component after mixing results in a structural adhesive. The first component comprises at least four of a (meth)acrylic acid, a C1-6-alkyl (meth)acrylate, a cycloalkyl (meth)acrylate, a hydroxy-C1-6-alkyl (meth)acrylate, and/or a glycolether (meth)acrylate. The second component comprises a peroxide polymerization initiator. Additionally, the first component and/or the second component comprises at least two toughening agents (a first toughening agent and a second toughening agent); the second toughening agent differing from the first toughening agent; a first impact modifier; and optionally a second impact modifier differing from the first impact modifier.