Silane-Modified Polyamine Curing Agent for Epoxy Resin
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Solution Overview
Problem
Water-based epoxy coatings typically underperform in corrosion resistance compared to solvent-borne systems, and existing silane-modified systems lack shelf-life stability due to premature hydrolysis and interaction with pigments and fillers, leading to reduced adhesion and anticorrosion effectiveness over time.
Innovation Solution
A curable epoxy resin composition comprising a combination of epoxy resin and a curing composition that includes polyamines and silane components such as (meth)acrylamidoalkylsilanes, cyanoalkylsilanes, and (meth)acryloxyalkylsilanes with phosphine oxide compounds, which provides improved wet adhesion and corrosion resistance on metal substrates without losing anticorrosion activity after aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organofunctional silanes are incorporated into the epoxy pigment part of a coating formulation, then wet adhesion and corrosion resistance are improved, but shelf life stability deteriorates due to premature hydrolysis of the silane
Solution Approach 1:
The invention separates the silane component from the epoxy pigment part and places it in the curing agent part instead. This segmentation prevents premature interaction between silane and pigments/fillers, thereby maintaining shelf life stability while preserving the corrosion resistance benefits when the coating is applied and cured.
Solution Approach 2:
The patent uses specific silane compounds ((meth)acrylamidoalkylsilanes, cyanoalkylsilanes, and their combinations with phosphine oxide compounds) as intermediaries that bridge the epoxy resin and metal substrate. These silanes provide both adhesion promotion and corrosion protection while maintaining stability through their unique chemical structures that resist premature hydrolysis.
2Reliability
If silane is added to improve corrosion resistance, then anticorrosion activity is enhanced, but the composition loses its effectiveness after aging due to premature hydrolysis and condensation
Solution Approach 1:
The silane components are pre-formulated in the curing agent composition with specific stabilizing agents and at controlled concentrations. This preliminary preparation ensures that the silane remains stable during storage and only becomes active when needed during the curing process, maintaining anticorrosion effectiveness even after extended aging periods of 2-3 months at 50°C.
Solution Approach 2:
The patent optimizes the concentration ranges of silane components (0.1-20 wt% based on total curing composition) and controls the molecular structure and reactivity parameters of the silane compounds. By adjusting these parameters, the formulation achieves a balance between maintaining shelf life stability and ensuring long-term anticorrosion effectiveness after aging.
3Adaptability or versatility
If water-based epoxy coating is used to meet regulatory specifications, then environmental compliance is improved, but corrosion resistance performance deteriorates compared to solvent-borne systems
Solution Approach 1:
The invention creates a composite curing system that combines polyamine curing agents with organofunctional silane components. This composite approach integrates the benefits of both water-based formulation (environmental compliance) and silane chemistry (enhanced corrosion resistance), achieving performance comparable to or exceeding solvent-borne systems while meeting regulatory requirements.
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 achieves enhanced shelf-life stability and maintains improved corrosion resistance and adhesion on metal substrates, even after extended aging periods, by using a silane-modified polyamine curing agent that prevents premature hydrolysis and maintains effectiveness in water-based epoxy resin coatings.
Implementation Method 1
premature hydrolysis of the silane and its consecutive condensation
Implementation Method 2
premature hydrolysis of the silane and its consecutive condensation
Implementation Method 3
at least one photoinitiator (B); at least one acrylate monomer (C)
Data Source
AI summary
The present invention relates to a curable epoxy resin composition comprising at least one epoxy resin, at least one epoxy resin curing agent, in particular selected from polyamines, and at least one silane selected from the group consisting of (meth)acrylamidoalkylsilanes, cyanoalkyl silanes and a combination of at least one (meth)acrylalkylsilane and at least one phosphine oxide compound, improved, in particular, waterborne epoxy resin coating compositions comprising the same, a kit of an epoxy resin composition and the curing composition, cured articles articles made from the epoxy resin compositions, in particular, coatings, and the use of the epoxy resin compositions for the manufacture of various industrial goods.