2K Modified Epoxy Composition for Catalyst-Free Durable Curing
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Solution Overview
Problem
Epoxy resin systems suffer from diminished fracture resistance, low thermal stability, poor flexibility, and hydrophobicity, with fast curing blended systems leading to gelation, viscosity issues, and material failure under abrasive conditions.
Innovation Solution
A two-component (2K) composition comprising epoxy resins and an alkoxy-containing aminofunctional silicone resin curative, curing without catalysts, achieving a highly cross-linked system with controlled molar ratios and dual cure mechanism for improved stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If siloxane is added as a modifier to epoxy resins through physical blending, then flexibility and hydrophobicity are improved, but viscosity increases and phase separation occurs
Solution Approach 1:
The patent combines siloxane modification and epoxy functionality into a single integrated molecule (alkoxy-containing aminofunctional silicone resin) rather than physically blending separate components. This molecular-level merging prevents phase separation and viscosity issues while maintaining the desired flexibility and hydrophobicity properties.
Solution Approach 2:
The invention creates a composite material at the molecular level by incorporating siloxane segments with amine and alkoxy functional groups into the epoxy resin structure. This composite approach allows the material to exhibit both the flexibility and hydrophobicity of siloxanes while maintaining the structural integrity and reactivity of epoxy systems.
2Productivity
If catalyzed curing is used in blended epoxy-siloxane systems, then curing speed is improved, but gelation occurs and molecular motion is restricted
Solution Approach 1:
The alkoxy-containing aminofunctional silicone resin acts as both the modifier and the curing agent, eliminating the need for separate catalysts. The system cures through self-service mechanisms where the embedded amine groups react with epoxy groups without external catalysis, avoiding gelation while maintaining controlled curing.
Solution Approach 2:
The patent extracts the catalyst from the system entirely, relying instead on the intrinsic reactivity of the alkoxy-containing aminofunctional silicone resin. This removal of the catalyst eliminates the harmful gelation effect while the dual cure mechanism (alkoxy groups and amine groups) ensures complete curing.
3Productivity
If fast curing is achieved in blended systems, then productivity is improved, but material failure occurs under abrasive conditions
Solution Approach 1:
The patent changes the chemical parameters of the curing system by using alkoxy-containing aminofunctional silicone resin with controlled molar ratios of epoxide-reactive groups. This parameter optimization allows for complete cross-linking without gelation, achieving both adequate curing time and superior abrasion resistance in the cured product.
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 composition provides enhanced abrasion and corrosion resistance, maintaining physical properties and stability during curing, while avoiding gelation and viscosity issues, resulting in a robust and durable cured product.
Implementation Method 1
the reaction of the two components of said composition provides a cured product exhibiting abrasion and corrosion resistance
Implementation Method 2
achieving a highly cross-linked system with controlled molar ratios and dual cure mechanism for improved stability and performance
Implementation Method 3
comprising at least one alkoxy-containing aminofunctional silicone resin
Implementation Method 4
dual cure mechanism
Data Source
AI summary
The present invention is directed to a two component (2K) composition comprising: (A) a first component comprising: a) at least one epoxy resin different from said resin b); and, b) at least one elastomer modified epoxy resin; (B) a second component comprising: c) a curative which consists of at least one compound possessing at least two epoxide reactive groups per molecule, said curative being characterized by comprising at least one alkoxy-containing aminofunctional silicone resin, wherein said composition is characterized in that it is free of catalysts.