Epoxy Resin Curable Composition for Rapid Curing and Color Stability
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Solution Overview
Problem
Existing epoxy resin curable compositions face challenges in achieving rapid curing, high hardness, strong adhesive strength, and an excellent color tone, particularly in applications requiring rapid curing and colorlessness, such as adhesives for glass and decorative items.
Innovation Solution
An epoxy resin curable composition comprising an epoxy resin with two or more epoxy groups, a thiol compound with two or more thiol groups, an amine compound A with primary and/or secondary amino groups, and an amine compound B with tertiary amino groups, optimized in specific molar ratios to ensure quick curing, high hardness, and excellent color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a thiol compound and amine compound are used as curing agents and accelerators for epoxy resin, then rapid curing and high adhesive strength are achieved, but the cured product turns yellow and is colored
Solution Approach 1:
The invention changes the chemical composition parameters by introducing a specific amine compound with both primary/secondary amino groups and tertiary amino groups in defined molar ratios. This compositional parameter change enables the system to achieve rapid curing while maintaining colorlessness, resolving the contradiction between curing speed and coloration.
Solution Approach 2:
The invention uses a composite amine compound system containing multiple types of amino groups (primary, secondary, and tertiary) in specific proportions. This composite approach combines the rapid curing effect of tertiary amines with the color stability of primary/secondary amines, achieving both fast curing and excellent color tone.
2Object-affected harmful factors
If an epoxy resin curable composition is designed to be colorless, then excellent color tone is achieved, but curing speed decreases and hardness and adhesive strength are insufficient
Solution Approach 1:
The invention optimizes the molar ratio parameters of different amino groups within a specific range (M1+2/Me: 0.05-0.5, M3/Me: 0.005-0.1) to achieve the dual objective of colorlessness and rapid curing. This precise parameter control allows the composition to cure quickly while maintaining excellent color tone.
Solution Approach 2:
The invention employs a composite amine compound system that integrates primary, secondary, and tertiary amino groups in optimized proportions. This composite structure provides both the color stability of aromatic amines and the rapid curing capability of aliphatic tertiary amines, simultaneously achieving excellent color tone and fast curing speed.
3Strength
If conventional curing agents are used to achieve rapid curing, then high adhesive strength is obtained, but the cured product has insufficient hardness
Solution Approach 1:
The invention changes the chemical structure parameters of the curing agent by selecting an amine compound with a specific combination of primary/secondary and tertiary amino groups. This structural parameter change produces a cured product with optimized crosslinking density that simultaneously achieves high adhesive strength and high hardness.
Data Source
AI summary
An epoxy resin curable composition cures quickly, has high hardness after curing, and an excellent color tone. An epoxy resin curable composition contains an epoxy resin containing two or more epoxy groups in one molecule, a thiol compound containing two or more thiol groups in one molecule, an amine compound A containing a primary amino group and/or a secondary amino group, and an amine compound B containing a tertiary amino group, in which a molar ratio M1+2/Me is 0.11 to 0.5 and a molar ratio M3/Me is 0.005 to 0.1, in which Me is the number of moles of the epoxy groups contained in the epoxy resin curable composition, M1+2 is the total number of moles of the primary amino group and the secondary amino group, and M3 is the number of moles of the tertiary amino group.