Dual-Curing Structural Adhesive Precursors for Wide Gaps
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Solution Overview
Problem
Existing structural adhesives face challenges in bonding metal parts with complex three-dimensional configurations or wide gaps, lacking elasticity, tackiness, and insufficient adhesive strength, while also requiring additional materials for sealing and corrosion resistance.
Innovation Solution
A process involving a dual curing system with a cationically self-polymerizable monomer and a curable monomer, initiated at different temperatures, is used to create a curable precursor that is extruded and partially cured before application, allowing near-net shape bonding with excellent elasticity, tackiness, and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural adhesive films are used for bonding metal panels, then bonding strength is improved, but elasticity and tackiness are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the adhesive by using a two-component system ( Component A with cationically self-polymerizable monomer and Component B with curable monomer) that can be mixed in controlled ratios. This allows adjustment of viscosity, elasticity, and tackiness parameters while maintaining bonding strength, resolving the contradiction between strength and adaptability.
Solution Approach 2:
The patent creates a composite adhesive system combining two different monomer types (cationically self-polymerizable and curable monomers) that work synergistically. Component A provides initial tackiness and elasticity, while Component B enhances final bonding strength and durability, achieving both requirements simultaneously.
2Strength
If conventional joining techniques like screws and bolts are used, then mechanical strength is achieved, but corrosion resistance and sealing are insufficient
Solution Approach 1:
The patent merges multiple functions into a single adhesive system: structural bonding, sealing, and corrosion protection. The adhesive forms a continuous protective film that seals joints against moisture and corrosive agents while providing mechanical strength, eliminating the need for separate sealing materials and improving corrosion resistance compared to mechanical fastening alone.
3Object-affected harmful factors
If additional sealing materials are used for corrosion resistance, then protection is improved, but device complexity increases
Solution Approach 1:
The adhesive is designed as a multi-functional material that simultaneously provides bonding, sealing, and corrosion protection. This universal solution eliminates the need for multiple separate materials (adhesive plus sealant plus primer), reducing material complexity and application steps while maintaining comprehensive protection.
4Adaptability or versatility
If structural adhesives are used for complex three-dimensional configurations, then bonding capability is improved, but manufacturing precision and gap filling are insufficient
Solution Approach 1:
The adhesive exhibits dynamic rheological properties during application and curing. The two-component system allows the adhesive to remain workable and flow into complex geometries and gaps during the open time period, then progressively cures to achieve precise bonding in three-dimensional configurations, resolving the contradiction between adaptability and manufacturing precision.
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 process enables high-performance bonding with excellent adhesion to complex geometries and wide gaps, providing superior adhesive strength, flexibility, and corrosion resistance without additional sealing materials.
Implementation Method 1
a cationically self-polymerizable monomer; a polymerization initiator of the cationically self-polymerizable monomer which is initiated at a temperature T1
Implementation Method 2
a curable monomer which is different from the cationically self-polymerizable monomer; a curing initiator of the curable monomer which is initiated at a temperature T2
Implementation Method 3
pressing the extrudable composition of step c) through the extrusion die, thereby forming an extrudate
Data Source
AI summary
The present disclosure relates to a process of manufacturing curable precursor of a structural adhesive composition. According to another aspect, the present disclosure is directed to method of bonding two parts.