Fast Curing Epoxy Systems Using Metal Triflate Catalysts
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Solution Overview
Problem
Epoxy resin systems often harden too slowly or require high temperatures, which can hinder productivity and pose challenges in cold environments where quick surface hardening is necessary for applications like corrosion protection on ships or pipelines.
Innovation Solution
Compositions containing a maximum of 10% by weight of alkylphenol, at least one epoxy resin, a cyclic amine with two secondary amino groups within an organic ring system, and a salt of a Brönsted acid with a pKa value less than or equal to 2, along with amines that do not have secondary amino groups, to enhance curing speed and reduce environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional epoxy resin systems are used, then good chemical resistance and adhesion are achieved, but the curing speed is slow and requires high temperatures
Solution Approach 1:
The patent changes the chemical parameters of the curing system by introducing a specific catalyst system (metal triflate combined with imidazole or imidazoline) and optimizing the amine hardener composition. This enables the curing reaction to proceed at lower temperatures with significantly increased speed, resolving the contradiction between curing speed and temperature requirements
Solution Approach 2:
The patent uses metal triflates (such as aluminum triflate, boron trifluoride etherate) as intermediary catalysts that facilitate the curing reaction between epoxy resin and amine hardener. These catalysts act as mediators that lower the activation energy required for the reaction, enabling fast curing at reduced temperatures without compromising the final product quality
2Speed
If high concentrations of alkylphenol are used as catalyst, then curing acceleration is achieved, but environmental impact increases
Solution Approach 1:
The patent changes the type and concentration of catalytic substances used. Instead of relying on high concentrations of alkylphenol (which has environmental drawbacks), the invention uses metal triflates in combination with imidazoles at optimized, lower concentrations. This maintains fast curing speed while significantly reducing environmental harm
Solution Approach 2:
The patent employs catalysts that are highly effective at very low concentrations and do not require persistent presence in the environment. The metal triflate-imidazole catalyst system achieves its catalytic function efficiently and can be used in environmentally friendly formulations with minimal residual impact
3Productivity
If epoxy systems are designed for fast curing, then productivity increases, but formulation complexity increases
Solution Approach 1:
The patent develops a universal catalyst system (metal triflate combined with imidazole or imidazoline) that can be applied across different epoxy resin types and application scenarios. This multi-functional approach allows fast curing to be achieved without requiring separate complex formulations for each specific application, thereby increasing productivity while controlling formulation complexity
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 described compositions cure significantly faster than previous formulations, even at temperatures below room temperature, and have a reduced environmental impact due to lower alkylphenol content, making them more suitable for quick processing in various applications.
Implementation Method 1
at least one salt of a Brönstedt acid with a pKa value less than or equal to 2 with a counterion selected from metal ions, metal-containing ions, phosphonium ions and ammonium ions
Data Source
AI summary
The present invention relates to an alkylphenol-poor composition comprising a) at least one epoxy resin, b) at least one amine with at least two secondary amino groups, both of which are part of an organic ring system, and c) at least one salt of a strong Brønsted acid with a counterion selected from metal ions, metal-containing ions, phosphonium ions and ammonium ions, a process for its preparation and its use.