(Meth)acrylate Monomer Composition for Oxygen-Inhibited Surface Curing
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Solution Overview
Problem
Existing acrylic compositions face issues with oxygen inhibition at the surface, leading to slow polymerization and tacky surfaces, which hinder productivity in fields like electronics and construction.
Innovation Solution
A two-component crosslinkable composition comprising a reducing agent, metal salt, (meth)acrylate monomer, oxidizing agent, and radical photoinitiator, which can be polymerized under electromagnetic radiation to overcome oxygen inhibition and achieve rapid deep polymerization with non-tacky surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If radical polymerization is initiated by a redox system in acrylic compositions, then polymerization can occur, but oxygen inhibition prevents rapid surface polymerization and leaves surfaces tacky
Solution Approach 1:
The invention segments the polymerization initiation into two distinct systems: a redox system for bulk polymerization and a photoinitiator system for surface polymerization. This segmentation allows each system to operate optimally in its respective zone, with the photoinitiator specifically addressing oxygen inhibition at the surface by generating radicals upon light exposure, thereby enabling rapid surface polymerization without tackiness.
Solution Approach 2:
The photoinitiator acts as an intermediary that bridges the gap between atmospheric oxygen and the polymerization process. By absorbing light energy and generating radicals at the surface, it overcomes the oxygen barrier that normally prevents surface polymerization. The photoinitiator mediates the conversion of light energy into chemical activity that penetrates through the oxygen layer to initiate polymerization at the surface.
2Strength
If two-component systems are used with reducing and oxidizing agents, then crosslinking can occur, but the process is slow and productivity is reduced
Solution Approach 1:
The invention merges two polymerization mechanisms into a single composition system: redox-initiated bulk polymerization and photoinitiator-induced surface polymerization. This combination allows simultaneous development of cohesion in the bulk (via redox crosslinking) and rapid surface setting (via photopolymerization), thereby achieving both high strength and high productivity without requiring separate processing steps.
Solution Approach 2:
The dual-initiation system ensures continuous useful action throughout the composition. While the redox system continuously generates radicals for bulk polymerization and cohesion development, the photoinitiator simultaneously and continuously generates surface radicals upon light exposure, maintaining uninterrupted polymerization at the surface. This continuity eliminates idle time and maximizes both strength development and productivity.
3Stability of the object's composition
If surfaces are exposed to atmospheric oxygen, then polymerization can occur in the bulk, but surface polymerization is inhibited and surfaces remain tacky
Solution Approach 1:
The invention applies local quality by using different initiation mechanisms for different zones of the composition. The redox system operates specifically in the bulk where oxygen access is limited, providing stable bulk polymerization and crosslinking. The photoinitiator is localized to the surface region where it absorbs light and generates radicals to overcome oxygen inhibition, ensuring high-quality non-tacky surfaces. Each zone receives the type of polymerization initiation most suitable for its specific conditions.
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 enables rapid cohesion increase, providing non-tacky surfaces and improved mechanical performance, enhancing productivity in industrial processes.
Implementation Method 1
said composition being characterized in that it comprises at least one radical photoinitiator in component A and/or B
Implementation Method 2
Radical polymerization is typically initiated by a redox system which, by means of an oxidation-reduction reaction, results in the production of radicals
Data Source
AI summary
The present invention relates to a two-component crosslinkable composition comprising:a component A comprising:a reducing agent;a metal salt chosen from the group consisting of metal salts of (meth)acrylic acid, metal salts of itaconic acid, and mixtures thereof;at least one (meth)acrylate monomer M1;a component B comprising an oxidizing agent; said composition being characterized in that it comprises at least one radical photoinitiator in component A and/or B; and also uses thereof.