Ester-Free Thiols for Epoxy Fire Coatings
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Solution Overview
Problem
Compositions based on epoxy resins containing thiol compounds and amine compounds have limited storage stability, leading to undesirable reactions and decomposition, which affects handling, application, and curing properties, particularly in fire protection coatings where thiol compounds with ester groups exacerbate these issues.
Innovation Solution
The use of ester group-free thiol compounds in epoxy-based compositions improves storage stability by preventing unwanted reactions with amine compounds, allowing for longer storage without viscosity changes or curing behavior disruptions, enabling the formulation of two-component systems with enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thiol compounds with ester groups are used in epoxy-based compositions, then the compositions can be formulated with curing agents, but the storage stability deteriorates due to unwanted reactions and decomposition
Solution Approach 1:
The invention changes the chemical structure parameter of the thiol compound by removing ester groups from the molecule. This structural modification fundamentally alters the reactivity profile, preventing unwanted reactions during storage while maintaining curing functionality when activated.
Solution Approach 2:
The invention extracts or removes the problematic ester group functionality from the thiol compound structure. By eliminating this specific functional group, the composition loses its unwanted reactivity during storage while retaining the essential thiol curing capability.
2Adaptability or versatility
If thiol compounds are stored with amine compounds, then the compositions can be applied as two-component systems, but the viscosity changes and handling properties deteriorate
Solution Approach 1:
The invention modifies the chemical parameters of the thiol compound by eliminating ester groups, which changes its interaction profile with amine compounds during storage. This prevents unwanted reactions that would otherwise cause viscosity changes, maintaining stable handling properties.
3Duration of action of stationary object
If thiol compounds undergo decomposition during storage, then the compositions can be stored for extended periods, but the curing properties and processing time deteriorate
Solution Approach 1:
The invention removes the decomposition pathway by eliminating ester groups from the thiol compound structure. This prevents the decomposition reactions that would otherwise occur during storage, ensuring that the curing properties and processing characteristics remain reliable and consistent over time.
4Ease of manufacture
If ester group-containing thiol compounds are used, then the compositions can be formulated, but volatile products are formed leading to unpleasant odors
Solution Approach 1:
The invention extracts or removes the ester group functionality that is responsible for generating volatile products during decomposition. By eliminating this functional group, the composition no longer produces unpleasant odors while maintaining its formulation capabilities.
Data Source
AI summary
A composition that forms an insulating layer contains an epoxy-thiol-based binder. Because the expansion rate of the composition is relatively high, coatings having the layer thickness required for the relevant fire resistance duration can be applied in a simple and rapid manner, and it is possible to reduce the layer thickness to a minimum while still achieving a good insulating effect. The composition is particularly suitable for fire-protection, in particular as a coating for metal and non-metal substrates, e.g., steel components such as supports, beams, and truss members, to increase the fire resistance duration thereof.