Tertiary Amine Epoxy Adhesive Rapid Curing
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Solution Overview
Problem
Epoxy-based two-component systems for adhesive applications in construction, such as chemical dowels, face challenges with slow curing times, insufficient hardness, and low failure loads, which hinder rapid solid anchoring in materials like concrete and wood.
Innovation Solution
A two-component system comprising component (A) with an epoxide and component (B) containing a tertiary amine, without primary or secondary amines, in a non-stoichiometric ratio, where the tertiary amine is present in excess, allowing for rapid curing and achieving high hardness and failure loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional two-component epoxy systems are used, then adhesive bonding is achieved, but curing time is excessive and hardness development is slow
Solution Approach 1:
The patent changes the chemical parameters by using a tertiary amine with specific structural features (aromatic ring with electron-donating groups) instead of conventional primary or secondary amines. This parameter change in the hardener component accelerates the curing reaction kinetics while maintaining complete epoxy conversion, thereby reducing curing time without compromising bond strength
Solution Approach 2:
The patent creates a composite curing system by combining the tertiary amine hardener with the epoxy resin in a specific formulation. This composite material system exhibits synergistic effects where the tertiary amine catalyzes rapid curing while the epoxy network develops high hardness and strength, resolving the contradiction between fast curing and reliable bonding
2Productivity
If rapid curing is achieved through exothermic reaction, then curing speed increases, but temperature control becomes difficult and may cause defects
Solution Approach 1:
The patent modifies the reaction parameters by selecting a tertiary amine with specific molecular structure (aromatic ring with electron-donating substituents) that provides optimal catalytic activity. This parameter optimization enables rapid curing at lower temperatures, achieving high productivity while controlling the exothermic temperature rise to prevent defects
3Strength
If high hardness is achieved quickly, then anchoring performance improves, but the system may become too rigid and brittle
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific tertiary amine structure that enables rapid crosslinking while maintaining network flexibility. The electron-donating groups on the aromatic ring provide both rapid reactivity for quick hardness development and structural flexibility that prevents excessive brittleness, achieving high ShoreD hardness while maintaining material stability
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 system achieves quick curing, high ShoreD hardness, and high failure loads, making it suitable for rapid anchoring in construction materials within short times, such as ≤ 10 minutes for temperature increase and ≤ 24 hours for ShoreD hardness ≥ 70, and reference bond stress ≥ 10 N/mm².
Implementation Method 1
The curing of epoxides using tertiary amines via a catalytic curing mechanism is basically known. However, the tertiary amines are regularly only used as a catalyst and only in combination with at least one primary or secondary amine.
Implementation Method 2
The reaction between components (A) and (B) that leads to hardening is regularly exothermic and therefore results in an increase in temperature.
Data Source
AI summary
A two-component system for adhesive applications is described, comprising one component (A) comprising an epoxy with two or more epoxy groups, and one component (B) comprising a tertiary amine, wherein the two-component system does not include a primary or secondary amine.