Amine Accelerator for Epoxy Resins Curing
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Solution Overview
Problem
Existing epoxy resin curing accelerators often cause odor issues, increase viscosity, and do not integrate well into the polymer network, leading to suboptimal curing speeds and surface quality.
Innovation Solution
A novel amine compound, produced through reductive alkylation of dimethylamine with benzonitrile and hydrogen, which acts as a low-odor, low-viscosity accelerator that integrates into the polymer network, enabling fast and efficient curing of epoxy resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional accelerators like nonylphenol or tert-butylphenol are used, then curing acceleration is achieved, but toxicity, emissions, and discoloration occur
Solution Approach 1:
The patent changes the chemical structure parameters of the accelerator by using phenolic compounds with specific substituents (alkyl groups with 1-12 carbon atoms, particularly tert-butyl groups) to achieve both rapid curing and reduced toxicity. The modified phenolic structures maintain accelerator functionality while eliminating the harmful properties of conventional accelerators.
Solution Approach 2:
The patent employs composite phenolic structures combining aromatic rings with specific alkyl substituents to create accelerators that integrate beneficial properties: the phenolic core provides accelerator activity while the alkyl groups reduce polarity and improve compatibility, resulting in a composite molecular structure that achieves both rapid curing and low emissions.
2Productivity
If 2,4,6-tris(dimethylaminomethyl)phenol is used as accelerator, then curing acceleration is maximized, but strong amine odor is emitted
Solution Approach 1:
The patent modifies the molecular structure by replacing amine groups with phenolic hydroxyl groups and alkyl substituents, fundamentally changing the functional groups responsible for odor while maintaining the accelerator mechanism through phenolic chemistry.
Solution Approach 2:
The patent converts the harmful amine functionality into beneficial phenolic functionality, where the phenolic hydroxyl group serves as the active accelerator site while the aromatic structure and alkyl groups provide low-odor properties, effectively transforming a harmful chemical characteristic into a beneficial one.
3Productivity
If amine hardeners like DMAPA, DMAPAPA, or 2,4,6-tris((2-dimethylaminopropyl)aminomethyl)phenol are used, then accelerator function is achieved, but significant blushing effects occur at cool temperatures and large areas
Solution Approach 1:
The patent changes the chemical parameters by using phenolic compounds with specific alkyl substituents that have different steric and electronic properties compared to amine hardeners, resulting in altered curing behavior that eliminates blushing while maintaining accelerator effectiveness.
Solution Approach 2:
The patent introduces local structural features through specific alkyl substituents (particularly tert-butyl groups) at strategic positions on the phenolic ring, creating localized steric and electronic effects that prevent the blushing phenomenon while preserving the accelerator function.
4Object-generated harmful factors
If acids like salicylic acid are used as accelerators, then odor is minimized, but viscosity increases significantly and accelerating effect is insufficient
Solution Approach 1:
The patent creates composite phenolic structures that combine the low-odor advantage of carboxylic acid-free phenolics with enhanced accelerator activity through specific substituent patterns, achieving both low odor and strong accelerating effect simultaneously.
Solution Approach 2:
The patent optimizes molecular parameters including substituent position, alkyl group size, and phenolic hydroxyl availability to enhance accelerator activity while maintaining low viscosity and odor properties, achieving superior performance compared to conventional acid-based accelerators.
5Productivity
If existing accelerators are used, then some curing acceleration is achieved, but they are not incorporated into the polymer network, leading to contamination and discoloration
Solution Approach 1:
The patent designs phenolic accelerators that serve multiple functions: they act as curing accelerators through their hydroxyl groups and simultaneously become integral parts of the polymer network through covalent bonding, eliminating the need for separate accelerator incorporation steps and preventing free accelerator contamination.
Solution Approach 2:
The patent merges the accelerator function with polymer network formation by designing phenolic compounds that participate in both acceleration and crosslinking reactions, combining two previously separate functions into a single multi-functional molecule.
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 amine compound achieves rapid and complete hardening of epoxy resins, even at cold temperatures, while maintaining a smooth, high-gloss surface and avoiding viscosity increases.
Implementation Method 1
The amine of formula (I) can be prepared in a simple process by reductive alkylation of a dimethylamine with a benzonitrile bearing a formyl or acetyl group and hydrogen
Implementation Method 2
Accelerators are often used to accelerate curing, particularly in cold-curing systems
Data Source
AI summary
The invention relates to the use of an amine of formula (I) for curing epoxy resins. The amine of formula (I) cures surprisingly fast, and in a trouble-free manner, provides a high final hardnesses, and produces beautiful, defect-free surfaces with high gloss even when applied over large areas and at cold temperatures. It is suitable as a hardener, co-hardener and/or installable accelerator for epoxy resin products such as, in particular, coatings, adhesives, potting compounds or mouldings.