Amine-Guanidine Hardener Mixture for Epoxy Resin Curing
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Solution Overview
Problem
Existing epoxy resin hardener systems face challenges in achieving a balance between increasing the cure rate and maintaining low viscosity during processing, which is crucial for complete mold filling and uniform impregnation of fiber materials, especially in large component production.
Innovation Solution
A mixture comprising a polyetheramine as hardener component a1), a further amine with functionality ≥2 as hardener component a2), and a guanidine derivative as hardener component b), with a1) to a2) ratio ranging from 0.1 to 10:1 and b) present at 5% to 55% by weight, is used to cure epoxy resins, allowing for enhanced cure rates without excessive viscosity increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IPDA is added to polyetheramine to increase cure rate, then the glass transition temperature and temperature stability are improved, but the viscosity increases rapidly and processing time is reduced
Solution Approach 1:
The hardener system is segmented into three distinct components: polyetheramine (a1), IPDA (a2), and guanidine derivative (b). Each component serves a specific function - polyetheramine provides low viscosity and extended processing life, IPDA delivers high reactivity and temperature stability, while the guanidine derivative acts as a catalyst to accelerate curing. This segmentation allows optimization of each component's contribution to resolve the contradiction between cure rate and processing life.
Solution Approach 2:
The guanidine derivative serves as an intermediary substance that catalyzes the curing reaction between the epoxy resin and amine hardeners. By introducing this catalytic intermediary, the system achieves accelerated cure rates without requiring a proportional increase in the concentration of reactive amine components, thereby maintaining lower viscosity and extended processing life while still achieving high productivity.
2Reliability
If IPDA is added to increase cure rate, then the glass transition temperature is improved, but the viscosity increase prevents complete mold filling
Solution Approach 1:
The invention applies local quality by assigning different functional characteristics to different hardener components. The polyetheramine component (a1) is specifically selected to maintain low viscosity and high fluidity for excellent mold filling, while the IPDA component (a2) is optimized for high reactivity and temperature stability. The guanidine derivative (b) is distributed throughout the system as a catalyst. This localized functional assignment ensures that each component contributes its optimal property to the overall system performance.
Solution Approach 2:
The invention utilizes parameter changes by carefully controlling the ratio of hardener components a1) to a2) in the range from 0.1 to 10:1 and adjusting the content of guanidine derivative (b) at 5% to 55% by weight. By varying these parameters, the system can be tuned to achieve the desired balance between curing performance and processing characteristics, allowing complete mold filling while maintaining reliable curing.
3Duration of action of moving object
If polyetheramine is used alone to maintain low viscosity, then the processing life is extended, but the cure rate and temperature stability are insufficient
Solution Approach 1:
The invention creates a composite hardener system combining three different amine components with complementary properties. The polyetheramine (a1) provides low viscosity and extended processing life, IPDA (a2) contributes high reactivity and temperature stability, and the guanidine derivative (b) acts as a catalytic enhancer. This composite approach allows the system to achieve both extended processing life and high cure rate with improved temperature stability, as each component compensates for the limitations of the others.
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
This solution enables a comparable or improved cure rate while maintaining a longer processing life, allowing for complete mold filling and uniform impregnation, even at higher temperatures, thus improving the productivity and energy efficiency in producing large components like rotor blades.
Implementation Method 1
The invention provides a mixture comprising a hardener component a1), a hardener component a2), and a hardener component b), wherein hardener component a1) is at least one polyetheramine having a functionality ≧2, hardener component a2) is at least one further amine having a functionality ≧2, and hardener component b) is 5% to 55% by weight, based on the mixture, of a compound of the formula I
Data Source
AI summary
The present invention provides a mixture comprising at least three hardener components a1), a2), and b), the ratio of hardener component a1) to a2) being in the range from 0.1 to 10:1, and hardener component b) being present at 5% to 55% by weight, based on the mixture, a process for preparing this mixture, the use of the mixture of the invention for curing epoxy resins, the use of the mixture of the invention with epoxy resins as adhesives, and an epoxy resin cured with the mixture of the invention.