Epoxy Resin Curing Agent Salt Accelerator
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Solution Overview
Problem
Conventional epoxy resin compounds based on benzoxazine-amine adducts have slow curing times, making them unsuitable for chemical fastening applications, especially at elevated temperatures, and exhibit low pull-out strength in high-temperature conditions and water-filled boreholes.
Innovation Solution
A curing agent composition comprising a benzoxazine-amine adduct and a reactive amine, with the addition of a salt as an accelerator, which accelerates the curing reaction, reducing curing time and enhancing pull-out strength at elevated temperatures, particularly in the range of 35°C to 50°C, and in water-filled boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If benzoxazine-amine adducts are used as curing agents, then the epoxy resin compound can be handled easily and good load values are achieved, but the curing time is extended and heat resistance is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific amine component ( Component B) with reactive hydrogen atoms that accelerates the curing reaction. This parameter change enables the system to maintain good handling behavior while significantly reducing curing time from the conventional extended period to approximately 4-6 hours at elevated temperatures.
2Loss of time
If the temperature is increased to above 80°C, then the curing time is reduced, but the application becomes impractical for outdoor constructions
Solution Approach 1:
The patent optimizes the curing temperature parameter to a practical range of 35°C to 50°C, which is suitable for outdoor construction conditions. By combining this optimized temperature parameter with the specific amine component (Component B), the system achieves rapid curing within 4-6 hours without requiring impractically high temperatures above 80°C.
3Ease of operation
If a high proportion of non-reactive diluents is used, then the processing time is extended, but this prevents achieving a short curing time
Solution Approach 1:
The patent carefully controls the formulation parameters by using a high proportion of reactive diluents (epoxy resins with EEW 150-300 g/EQ) instead of non-reactive diluents. This parameter change ensures that the diluents contribute to the curing reaction, thereby achieving both extended working time for processing and short curing time of 4-6 hours simultaneously.
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 curing agent composition significantly shortens the curing time to approximately 4 to 6 hours, achieving high pull-out strength and ensuring the epoxy resin compounds can be loaded quickly, even in high-temperature conditions, and exhibit excellent performance in water-filled boreholes.
Implementation Method 1
the curing time of which is accelerated by adding a salt (S) as a catalyst
Data Source
AI summary
A curing agent composition for an epoxy resin compound useful for the chemical fastening of construction elements, an epoxy resin compound, and a multi-component epoxy resin system are provided. Methods for the chemical fastening of construction elements in boreholes and the use of a salt (S) as an accelerator in an epoxy resin compound for chemical fastening are provided, the epoxy resin compound including a benzoxazine-amine adduct and an amine which is reactive to epoxy groups.