Acrylic Adhesive Curing via Redox Catalyst
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Solution Overview
Problem
Current acrylic adhesives require temporary fixing jigs to prevent misalignment during bonding at room temperature, which hinders high-speed curing and reduces productivity in industries like steel plate production.
Innovation Solution
A curable composition comprising a polymerizable acrylic monomer, cumene hydroperoxide, a reducing agent containing vanadium or copper, and a basic compound with a primary, secondary, or tertiary amine structure, which allows for rapid curing at room temperature without the need for temporary fixing jigs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional acrylic adhesive uses an organic peroxide and a reducing agent (ethylene thiourea derivative) for curing, then the adhesive can cure at room temperature, but the curing speed is insufficient and temporary fixing jigs are still required
Solution Approach 1:
The patent changes the chemical parameters of the curing system by replacing the conventional reducing agent (ethylene thiourea derivative) with a peroxide-reducing catalyst system (metal salts like cobalt, manganese, iron, or copper compounds). This parameter change enables rapid curing at room temperature while maintaining bonding reliability, eliminating the need for temporary fixing jigs.
Solution Approach 2:
The patent discards the conventional reducing agent (ethylene thiourea derivative) that provided insufficient curing speed and recovers the desired rapid curing performance by introducing a peroxide-reducing catalyst system that actively decomposes cumene hydroperoxide to generate radicals at room temperature, achieving both speed and reliability.
2Productivity
If temporary fixing jigs are used to prevent misalignment during bonding, then bonding reliability is maintained, but productivity decreases and production costs increase
Solution Approach 1:
The patent implements preliminary action by designing a curing system that provides instantaneous temporary fixing effect upon contact. The peroxide-reducing catalyst system generates radicals immediately upon mixing, causing rapid polymerization that locks components in position before any misalignment can occur, eliminating the need for mechanical fixing jigs.
Solution Approach 2:
The patent replaces the mechanical system of temporary fixing jigs with a chemical system (peroxide-reducing catalyst) that provides instantaneous bonding. The chemical reaction substitutes for mechanical constraint, achieving alignment fixation through molecular-level bonding rather than physical clamping.
3Reliability
If the curing time is extended to ensure complete bonding without jigs, then bonding reliability improves, but the time required for production increases
Solution Approach 1:
The patent implements periodic action through a two-stage curing process: (1) instantaneous temporary fixing phase where rapid radical generation provides immediate bond strength to prevent misalignment, and (2) complete curing phase where the reaction continues to develop full bond strength. This periodic action achieves both reliability and time efficiency.
Solution Approach 2:
The peroxide-reducing catalyst system performs preliminary action by generating radicals immediately upon contact, initiating rapid polymerization that provides temporary fixing within seconds. This preliminary chemical action ensures bonding reliability is achieved quickly without extending the overall production time.
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 instantaneous temporary fixing and quick curing, eliminating the need for jigs and enhancing productivity by allowing for faster bonding without misalignment, thereby reducing production costs and improving line efficiency.
Implementation Method 1
component (B) is cumene hydroperoxide, component (C) is a reducing agent containing vanadium or copper or a reducing agent comprising ethylene thiourea
Implementation Method 2
an organic peroxide and a reducing agent which decomposes the organic peroxide to generate radicals, which function as a polymerization initiator
Implementation Method 3
bonding by polymerizing and curing an acrylic monomer or oligomer
Data Source
AI summary
A curable composition and an adhesive which exhibit a temporarily fixing effect very quickly and which are completely cured quickly at room temperature, and a bonding method using such a composition. The curable composition including a component (A)], which is a polymerizable acrylic liquid composition, a component (B), which is cumene hydroperoxide, a component (C), which is a reducing agent containing vanadium or copper, or a reducing agent comprising ethylene thiourea, and a component (D), which is a basic compound having a primary, secondary, or tertiary amine structure.