Water-Based Epoxy Curing Agent for Salt Water Corrosion Resistance
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Solution Overview
Problem
Water-based epoxy resin compositions often lack sufficient curing rate, hardness, and chemical resistance, particularly in salt water environments, making them unsuitable for corrosion-resistant coatings without compromising appearance or safety.
Innovation Solution
A curing agent for water-based epoxy resin comprising a combination of polyamide amine-based curing agents, reaction products of polyamine and polyepoxy compounds, and Mannich reaction products, along with reaction products of styrene and amine compounds, and epichlorohydrin with amine compounds, optimized in specific mass ratios to enhance curing performance and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a highly hydrophilic curing agent is combined with water-based epoxy resin, then the composition is suitable for water-based production and environmental safety, but the curing rate and coating film hardness and chemical resistance are insufficient
Solution Approach 1:
The patent uses a composite curing agent system combining polyamide amine-based curing agent (a1) with reaction products (a2, a3) and Mannich reaction products (b1, b2). This composite approach creates synergistic effects where each component contributes different properties: polyamide amine provides water compatibility and basic curing function, while the reaction products and Mannich bases enhance curing rate, crosslinking density, and chemical resistance. The multi-component system resolves the contradiction by integrating environmental safety (water-based) with high performance (improved curing rate and chemical resistance).
Solution Approach 2:
The patent optimizes the mass ratio parameters of the curing agent components (a1):(a2)+(a3):(b1)+(b2) within specific ranges (99:1 to 70:30, with preferred ranges of 95:5 to 90:10). By adjusting these compositional parameters, the formulation achieves balanced performance with sufficient curing rate, adequate hardness, and excellent salt water corrosion resistance while maintaining water-based environmental compatibility.
2Loss of substance
If conventional water-based epoxy resin composition is used, then solvent-free formulation is achieved, but salt water corrosion resistance and appearance stability are compromised
Solution Approach 1:
The patent employs a composite curing agent system that includes polyamide amine-based curing agent (a1), reaction products (a2, a3), and Mannich reaction products (b1, b2). This composite approach creates a densely crosslinked coating film structure that provides excellent barrier properties against salt water penetration. The multiple curing mechanisms and crosslinking pathways generate a more robust and chemically resistant network compared to single-component systems, thereby achieving superior salt water corrosion resistance without requiring organic solvents.
Solution Approach 2:
The patent specifies optimized mass ratio parameters for the curing agent components to achieve the desired balance between solvent-free formulation and corrosion resistance. The ratio ranges (a1):(a2)+(a3):(b1)+(b2) = 99:1 to 70:30, particularly 95:5 to 90:10, are determined to produce optimal crosslinking density and film integrity that resists salt water degradation while maintaining a solvent-free composition.
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 solution provides a water-based epoxy resin composition with improved curability, hardness, chemical resistance, and salt water corrosion resistance, suitable for various applications including corrosion-resistant paints and coatings without using solvents, ensuring environmental and safety standards.
Implementation Method 1
A curing agent for a water-based epoxy resin, which contains the following component (A) and component (B): (A) at least one selected from the group consisting of a polyamide amine-based curing agent (a1), a reaction product (a2) of a polyamine compound and a polyepoxy compound, and a Mannich reaction product (a3) of a polyamine compound, a phenol compound, and an aldehyde compound
Data Source
AI summary
Provided is a curing agent for a water-based epoxy resin, which contains the following component (A) and component (B): (A): at least one selected from the group consisting of a polyamide amine-based curing agent (a1), a reaction product (a2) of a polyamine compound and a polyepoxy compound, and a Mannich reaction product (a3) of a polyamine compound, a phenol compound, and an aldehyde compound; (B): at least one selected from the group consisting of a reaction product (b1) of styrene and an amine compound represented by the following formula (1), and a reaction product (b2) of epichlorohydrin and an amine compound represented by the following formula (1): 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.