Cold-Curing Epoxy Primer Resolving Toxic Phenol and Viscosity Trade-offs
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Solution Overview
Problem
Existing epoxy resin primers face challenges with high viscosity, slow curing at cold temperatures, and the presence of toxic phenolic substances, which affect their performance and safety for use on porous mineral substrates and construction sites.
Innovation Solution
A novel epoxy resin composition is developed, using a reaction product from the reaction of a specific amine with a carbonyl compound, which is free from toxic phenols and has a low viscosity, allowing rapid curing even at cold temperatures, and is suitable for use as a primer or adhesive on porous mineral substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Mannich bases are used as hardeners to achieve rapid curing at cold temperatures, then curing speed is improved, but toxic phenolic substances are present in the composition
Solution Approach 1:
The patent extracts and removes the toxic phenolic substances from the hardener system while retaining the rapid curing capability. This is achieved by using alternative hardeners such as modified polyamines and amine alcohols that do not contain phenolic groups, thereby eliminating the harmful effect while preserving the beneficial curing speed at cold temperatures.
Solution Approach 2:
The patent employs hardeners with shorter pot lives that cure rapidly without requiring phenolic substances. These alternative hardeners are designed to provide sufficient working time for application while ensuring complete curing even at low temperatures, replacing the need for toxic phenol-containing Mannich bases.
2Ease of operation
If the epoxy resin composition has low viscosity for good wetting and penetration, then ease of application is improved, but mechanical strength after curing deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the epoxy resin system by incorporating specific low-viscosity modifiers and reactive diluents that maintain adequate flow properties for wetting and penetration. Simultaneously, the formulation includes high-performance hardeners and crosslinking agents that ensure the cured composite achieves high mechanical strength, thus resolving the contradiction between low viscosity and high strength.
3Object-affected harmful factors
If phenol-free replacement hardeners are used to eliminate toxic substances, then safety is improved, but viscosity increases and curing speed decreases
Solution Approach 1:
The patent creates a composite hardener system combining multiple phenol-free components with complementary properties. This includes mixing modified polyamines, amine alcohols, and other non-phenolic hardeners in specific ratios to achieve both low viscosity and rapid curing performance, thereby eliminating toxic phenols while maintaining or improving curing speed.
Solution Approach 2:
The patent formulates a dynamic hardener system where the combination of different phenol-free hardeners provides initial rapid reaction for quick curing while maintaining fluidity for adequate wetting. The synergistic interaction between hardener components ensures fast curing kinetics without the need for toxic phenolic substances.
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 rapid curing, high mechanical strength, and low viscosity, making it ideal for construction applications, while being free from toxic phenols, ensuring safety and environmental compatibility.
Implementation Method 1
the reaction of at least one amine of the formula (I) with at least one carbonyl compound of the formula (II) and hydrogen
Implementation Method 2
the phenolic group of the reaction product is chemically bound into the resulting epoxy polymer during curing
Implementation Method 3
the composition hardens quickly, even in the cold
Implementation Method 4
the phenolic group of the reaction product is chemically bound into the resulting epoxy polymer during curing
Data Source
AI summary
The invention relates to the use of an epoxy resin composition, containing at least one reaction product from the reaction of at least one amine of formula (I) with at least one carbonyl compound of formula (II) and hydrogen, as a cold curing primer or adhesive. Primers or adhesives of this type cure rapidly and trouble-free at ambient temperature, even at cold temperatures such as 10 or 5 °C, suffer remarkably little yellowing and are free from toxic phenol compounds such as phenol, tert-butylphenol or nonylphenol. The primer has a particularly low viscosity and is particularly suitable for priming porous mineral substrates.