Water-Based Epoxy Resin Composition with Optimized Curing Agent
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Solution Overview
Problem
Water-based epoxy resin compositions face challenges with high viscosity, poor workability, and inadequate chemical resistance, particularly salt water corrosion resistance, which affects their adhesiveness and durability in applications like corrosion-resistant paints.
Innovation Solution
A water-based epoxy resin composition is developed by blending a water-based epoxy resin with a curing agent composition containing a reaction product of epichlorohydrin and an amine compound, optimized in a specific ratio to achieve low viscosity, good workability, and enhanced chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water-based epoxy resin composition is used to reduce environmental impact and improve safety, then the composition becomes more environmentally friendly, but the viscosity increases and workability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific curing agent (reaction product of polyamine and epichlorohydrin) and optimizing the epoxy resin to water ratio. This parameter change allows the composition to maintain low viscosity and good workability while remaining water-based and environmentally friendly.
Solution Approach 2:
The patent creates a composite system by combining water-based epoxy resin with a specifically designed curing agent composition. This composite approach allows the formulation to achieve both environmental compatibility and operational performance by leveraging the complementary properties of the components.
2Object-affected harmful factors
If a water-based epoxy resin composition is used to improve safety, then safety is enhanced, but chemical resistance particularly salt water corrosion resistance becomes insufficient
Solution Approach 1:
The patent optimizes the chemical composition parameters, specifically the ratio of epoxy groups to active hydrogen atoms (within 0.5-2.0), and selects specific curing agents with proven chemical resistance. This parameter optimization enables the water-based composition to achieve salt water corrosion resistance comparable to solvent-based systems while maintaining safety advantages.
3Ease of manufacture
If pigment is added to impart coloring properties, then coloring properties are improved, but adhesiveness of the coating film deteriorates
Solution Approach 1:
The patent applies local quality by optimizing the curing agent distribution and reaction characteristics in different regions of the coating formulation. The specific curing agent composition ensures that adhesion is maintained at the substrate-coating interface even when pigments are present in the coating body, allowing coloring without sacrificing bonding strength.
4Ease of operation
If the composition is formulated to reduce viscosity, then workability is improved, but chemical resistance may be compromised
Solution Approach 1:
The patent carefully balances viscosity-reducing parameters (water content, molecular weight of components) with chemical resistance parameters (curing agent selection, epoxy-to-amine ratio). By optimizing these parameters within specific ranges, the formulation achieves both low viscosity for good workability and sufficient crosslinking density for chemical resistance.
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 resulting composition exhibits improved workability, excellent adhesiveness, and superior chemical resistance, including outstanding salt water corrosion resistance, making it suitable for various applications such as corrosion-resistant paints, adhesives, and coatings.
Implementation Method 1
a compound obtained by subjecting a polyamine and an alkenyl compound, an epoxy compound, or the like to addition reaction
Implementation Method 2
the water-based epoxy resin composition having a content ratio of the component (A) and the component (B) defined as [number of epoxy groups in component (A)/number of active amine hydrogens in component (B)]
Implementation Method 3
blending a water-based epoxy resin (A) and a curing agent composition (B) containing a reaction product (b1) of epichlorohydrin and an amine compound
Implementation Method 4
a coating film thereof being excellent in adhesiveness and having excellent chemical resistance
Data Source
AI summary
Provided is a water-based epoxy resin composition and a cured product thereof, the water-based epoxy resin composition obtained by blending a water-based epoxy resin (A) and a curing agent composition (B) containing a reaction product (b1) of epichlorohydrin and an amine compound represented by the following formula (1), the water-based epoxy resin composition having a content ratio of the component (A) and the component (B) defined as [number of epoxy groups in component (A)/number of active amine hydrogens in component (B)] of 1/1.1 to 1/0.3:H2N—CH2—A—CH2—NH2 (1)wherein A is a 1,2-phenylene group, a 1,3-phenylene group, or a 1,4-phenylene group.