Water-borne epoxy resin formulation for low VOC and high hardness
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Solution Overview
Problem
Existing epoxy resin coatings have high volatile organic compounds (VOC) content, which is environmentally harmful, and they lack enhanced impact resistance and hardness compared to solvent-based systems.
Innovation Solution
A water-borne epoxy resin composition is developed, comprising a reaction product of a monomer or oligomer with multiple epoxide groups, a polyether monoamine, and an epoxidized oil, which forms a stable aqueous dispersion with low VOCs, high adhesion, and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If solvent-based epoxy resin systems are used, then excellent adhesion and chemical resistance are achieved, but high volatile organic compounds (VOC) content is produced
Solution Approach 1:
The patent changes the fundamental parameter of the resin system from solvent-based to water-borne, formulating epoxy coatings where water replaces organic solvents as the continuous phase. This parameter change reduces VOC content while maintaining protective performance through careful selection of water-compatible epoxy resins, curing agents, and additives that ensure proper adhesion and chemical resistance in the aqueous system
Solution Approach 2:
The patent creates a composite water-borne epoxy coating system that integrates multiple components: epoxy resins, water, curing agents, and various functional additives. This composite approach allows the formulation to achieve both low VOC content and excellent performance by combining materials with complementary properties, where each component contributes specific functions to overcome the limitations of water-based systems
2Object-affected harmful factors
If water-borne epoxy resin formulations are used, then low VOC content is achieved, but impact resistance and hardness are reduced
Solution Approach 1:
The patent modifies key formulation parameters including resin molecular weight, crosslink density, and additive composition to optimize mechanical properties. By adjusting these parameters within the water-borne system, the coating achieves enhanced impact resistance and hardness while maintaining low VOC content, overcoming the typical performance limitations of aqueous epoxy formulations
Solution Approach 2:
The patent employs a composite formulation strategy combining water-borne epoxy resins with specific curing agents and performance-enhancing additives. This composite approach allows the coating to achieve superior mechanical properties including impact resistance and hardness while maintaining the environmental benefits of low VOC content, as each component contributes specific functional properties that compensate for the inherent limitations of water-based systems
Data Source
AI summary
The present invention provides an epoxy resin comprising: a polymer having a structure of a reaction product of a monomer of epoxy having at least two epoxide groups per molecule, a polyether monoamine, and an epoxidized oil. The present invention also provides an aqueous dispersion and a water-borne epoxy coating composition which comprise the epoxy resin. The present inventions are low in volatile organic compounds and have enhanced properties such as high hardness, high adhesion strength, high impact resistance and high corrosion resistance.