Photocurable Composition for Bonding Opaque Materials
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Solution Overview
Problem
Anaerobic curable compositions face issues with low storage stability and increased viscosity during storage, limiting their effectiveness in bonding opaque materials.
Innovation Solution
A photocurable composition containing a compound with an unsaturated double bond, a specific copper-based organometal compound, and a sensitizer, which maintains adhesion capability after light irradiation and under anaerobic conditions, ensuring excellent storage stability and rapid curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anaerobic curable composition is used for bonding opaque materials, then curing can proceed without light irradiation, but storage stability deteriorates and viscosity increases significantly during storage
Solution Approach 1:
The patent changes the chemical parameters of the composition by replacing traditional peroxide-based initiators with a photo-initiator system that can be activated by light. This allows the composition to remain stable during storage (no spontaneous curing) while enabling controlled curing when exposed to light, thus improving storage stability without completely eliminating the ability to bond opaque materials.
Solution Approach 2:
The patent creates a composite adhesive system combining photo-initiator, sensitizer, and specific monomer/oligomer components. This composite formulation achieves both storage stability (through the photo-initiation mechanism) and bonding capability for opaque materials (through the anaerobic curing mechanism), resolving the contradiction between these two requirements.
2Productivity
If photocurable resin is used for rapid curing, then mixing processing is not required and storage stability is favorable, but adhesion in shaded portions and slit portions does not proceed
Solution Approach 1:
The patent merges two curing mechanisms into a single adhesive system: photo-curing (for rapid curing where light reaches) and anaerobic curing (for curing in shaded portions and slits). This combination allows the adhesive to cure rapidly in exposed areas while also curing in areas where light cannot penetrate, thus resolving the contradiction between curing speed and adhesion capability in shaded portions.
Solution Approach 2:
The adhesive composition is designed to perform multiple functions: it can be rapidly cured by light irradiation in exposed areas, and it can also cure in the absence of light through anaerobic polymerization. This multi-functionality allows the single composition to address both rapid curing requirements and adhesion in shaded portions, eliminating the need for separate adhesive systems.
3Adaptability or versatility
If anaerobic curable composition is used to avoid light irradiation requirements, then bonding of opaque materials is enabled, but the composition gels for a long period and storage stability is low
Solution Approach 1:
The patent changes the initiation mechanism from purely chemical (anaerobic) to a dual system (photo-initiated and anaerobic). By introducing photo-initiators and sensitizers, the composition can be controlled to remain stable during storage (no spontaneous gelation) while maintaining the ability to cure in opaque material bonding applications through the anaerobic mechanism.
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 provides excellent storage stability and rapid curing in bonding opaque materials, eliminating the need for continuous light irradiation and improving workability in adhesion processes.
Implementation Method 1
a photocurable resin which is polymerized and cured immediately by irradiation with light such as ultraviolet light
Implementation Method 2
the anaerobic curable composition contains a (meth)acrylate ester monomer as a main component, and has properties that the anaerobic curable composition does not gel for a long period of time under contact with air or oxygen
Data Source
AI summary
Provided are a photocurable composition which has excellent storage stability and is cured rapidly in bonding an opaque material, and a product. The photocurable composition contains (A) a compound having an unsaturated double bond, (B) at least one compound selected from the group consisting of compounds represented by the general formulae (1), (2), and (3), and (C) a sensitizer. In the general formulae (1), (2), and (3), R1 to R3 are each independently a substituent containing at least one group selected from the group consisting of a nitro group, a cyano group, a hydroxy group, an acetyl group, a carbonyl group, a substituted or unsubstituted allyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, a heterocyclic ring structure-containing group, and a group having a plurality of rings. At least two groups selected from the group consisting of R1 to R3 may be bonded to each other to form a cyclic structure with carbon atoms to which the groups are bonded.