Two-Component Epoxy Adhesive Low-Temperature Curing Toughener
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Solution Overview
Problem
Toughened two-component epoxy adhesives require high temperatures for deblocking, which is energy and time-consuming and can cause distortion due to differential thermal expansion of adhered parts.
Innovation Solution
A two-component epoxy adhesive composition comprising Component A with a reactive toughener made by reacting a polyol and poly(butadiene)diol with a polyisocyanate, optionally chain extended with a di-phenol and end-capped with a specific molecule, mixed with Component B containing polyamines and latent epoxy curing agents, allowing curing at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature heating is applied to cause deblocking of phenol-capped isocyanate tougheners, then the toughener reacts with the epoxy matrix to form strong covalent links, but this process is energy and time-consuming and can cause distortion due to differential thermal expansion
Solution Approach 1:
The patent changes the chemical structure of the capping group from phenol to a thermally stable group that does not require deblocking at high temperatures. The new capping group maintains the toughener's reactivity at lower temperatures while providing thermal stability, thus reducing energy consumption and avoiding thermal expansion distortion.
Solution Approach 2:
The patent replaces the traditional phenol capping group with a more efficient capping system that eliminates the need for high-temperature deblocking. This substitution creates a more energy-efficient curing process that achieves the same covalent bonding function without the energy-intensive heating step.
2Strength
If high temperature heating is applied to cause deblocking of phenol-capped isocyanate tougheners, then the toughener reacts with the epoxy matrix to form strong covalent links, but this process increases curing time
Solution Approach 1:
The patent modifies the capping group chemistry to enable reaction at lower temperatures. The new thermally stable capping group allows the toughener to react with the epoxy matrix without requiring high-temperature deblocking, thus significantly reducing curing time while maintaining strong covalent bonding.
3Strength
If high temperature heating is applied to cause deblocking of phenol-capped isocyanate tougheners, then the toughener reacts with the epoxy matrix, but this can cause distortion if the adhered parts expand differentially under thermal exposure
Solution Approach 1:
The patent changes the capping group from phenol to a thermally stable alternative that eliminates the deblocking requirement. This allows the adhesive to cure at lower temperatures, preventing differential thermal expansion between adhered parts with different coefficients of thermal expansion, thus maintaining dimensional stability and avoiding distortion.
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
Significantly improves adhesive performance after heat and humidity exposure and reduces curing time and energy consumption while maintaining excellent mechanical characteristics.
Implementation Method 1
reacting at least one polyol and optionally poly(butadiene)diol with a polyisocyanate in the presence of a polyurethane catalyst
Implementation Method 2
Component B: bi) one or more polyamines; bii) optionally one or more latent epoxy curing agents; biii) one or more epoxy curing catalysts
Data Source
AI summary
Provided herein is a two-component adhesive composition showing excellent adhesive strength after heat and humidity exposure.