Curable Composition Low-Temperature Curing Adhesive
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Solution Overview
Problem
The existing curable compositions used for sealing electronic components and producing fiber-reinforced composite materials require high temperature and long curing times, which increases production costs and safety risks, and lack long pot life stability.
Innovation Solution
A curable composition is developed by blending a polymerizable compound, a reactive compound, an imidazolyl group-containing compound, and an oxime or oxime ester compound, which accelerates curing at low temperatures and maintains mechanical properties and viscosity stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature and long curing time are used to sufficiently cure the composition, then mechanical characteristics are improved, but production cost increases and operational safety deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the curing system by introducing a dual-curing mechanism: (1) using an imidazolyl group-containing compound as a catalyst to enable low-temperature curing of epoxy compounds, and (2) incorporating a radical polymerization initiator with specific half-life characteristics (5-48 hours at 60°C) to enable radical polymerization at low temperatures. This parameter change allows the composition to achieve sufficient curing at 60-80°C instead of requiring high temperatures, thereby resolving the contradiction between mechanical characteristics and operational safety/cost
Solution Approach 2:
The invention creates a composite curing system that combines multiple curing mechanisms: epoxy compound + imidazolyl catalyst, vinyl ether compound + radical polymerization initiator, and the interaction between these systems. This composite approach allows the composition to leverage the advantages of each curing mechanism, achieving complete curing at low temperatures while maintaining excellent mechanical properties, thus resolving the contradiction between strength and safety/cost
2Strength
If high temperature curing is used to achieve sufficient cure, then mechanical characteristics are improved, but production time increases
Solution Approach 1:
The invention changes the kinetic parameters of the curing reaction by selecting specific catalysts and initiators with optimized characteristics. The imidazolyl group-containing compound provides efficient catalysis at low temperatures, and the radical polymerization initiator is selected with a half-life of 5-48 hours at 60°C, ensuring adequate reactivity at low temperatures. This allows the curing process to proceed rapidly at 60-80°C, achieving full cure in 1-24 hours instead of requiring prolonged high-temperature treatment, thus resolving the contradiction between mechanical characteristics and production time
Solution Approach 2:
The invention implements continuous curing action through the dual-curing mechanism where both the epoxy-imidazolyl system and the vinyl ether-radical polymerization system operate simultaneously at low temperatures. This continuous dual-path curing ensures complete reaction without interruption, achieving full mechanical properties in a single low-temperature step rather than requiring extended high-temperature processing, thereby resolving the contradiction between strength and production time
3Duration of action of stationary object
If the composition is stored for long-term use, then availability is improved, but viscosity stability deteriorates
Solution Approach 1:
The invention extracts the curing agents and initiators from the main composition body, storing them as separate components that are mixed immediately before use. The imidazolyl group-containing compound and radical polymerization initiator are kept apart from their respective reactants during storage, preventing premature curing reactions. This extraction approach allows the composition to be stored indefinitely without viscosity changes, while enabling long pot life after mixing by controlling the curing kinetics through the selected catalyst and initiator systems
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 allows for rapid curing at low temperatures, achieving excellent mechanical characteristics and long pot life, thus reducing production costs and enhancing operational safety.
Implementation Method 1
a compound (C) which is an imidazolyl group-containing compound having a predetermined structure
Implementation Method 2
a compound (D) which is an oxime compound or an oxime ester compound having a predetermined structure
Implementation Method 3
a polymerizable compound (A) which is one or more compounds selected from the group consisting of an epoxy compound (A1) and a vinyl ether compound (A2)
Data Source
AI summary
A curable composition obtained by blending a polymerizable compound (A) having predetermined types of polymerizable functional groups, a reactive compound (B) having predetermined types of reactive functional groups, a compound (C) which is an imidazolyl group-containing compound having a predetermined structure, and a compound (D) which is an oxime compound or an oxime ester compound having a predetermined structure.