Two-Part Epoxy Coatings for BPA-Free Storage Tank Adhesion
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Solution Overview
Problem
Existing coatings for storage articles, particularly those used in potable water and food contact applications, face challenges such as leaching of compounds like BPA and BADGE, which can migrate into the contents, and lack performance in harsh environments while maintaining film integrity and adhesion.
Innovation Solution
A two-part epoxy coating composition free of BPA and BADGE, utilizing a polyepoxide with sterically hindered phenylene ether segments and a curing agent, forming a polyether polymer under ambient conditions, providing superior adhesion and resistance to blistering, discoloration, and chemical attack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BPA-based epoxy coatings are used to achieve good adhesion and durability, then coating performance is improved, but health safety deteriorates due to BPA leaching into food products
Solution Approach 1:
The patent extracts and removes the harmful BPA component from the epoxy coating formulation while retaining the essential performance characteristics. The invention uses alternative epoxy compounds that do not contain BPA or compounds that can leach into food, thereby eliminating the harmful effect while preserving adhesion and durability.
Solution Approach 2:
The patent changes the chemical composition parameters of the epoxy coating by substituting BPA-based compounds with alternative epoxy resins. This parameter change maintains the functional performance (adhesion, durability) while altering the chemical safety profile to eliminate BPA leaching.
2Object-affected harmful factors
If alternative compounds to BPA are used to eliminate leaching, then health safety is improved, but coating performance deteriorates due to inadequate adhesion and film integrity
Solution Approach 1:
The patent employs composite material formulation by combining alternative epoxy compounds with specific curing agents and additives to achieve the desired performance. The composite formulation compensates for any performance deficits of individual alternative compounds, restoring adhesion and film integrity while maintaining BPA-free composition.
3Reliability
If polyvinyl chloride-based coatings are used to achieve protective properties, then coating functionality is improved, but environmental sustainability deteriorates due to recycling difficulties
Solution Approach 1:
The patent removes polyvinyl chloride from the coating formulation and replaces it with epoxy-based alternatives. This extraction eliminates the recycling problem associated with halide-containing polymers while maintaining the protective functionality of the coating.
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 coating composition achieves improved adhesion, chemical resistance, and stability in harsh conditions, reducing estrogenic agonist activity and maintaining film integrity, suitable for large storage tanks and food contact applications.
Implementation Method 1
a second liquid comprising a curing agent configured to react with the polyepoxide under ambient curing conditions. Once cured, the reacted polyepoxide and curing agent form a polyether polymer
Data Source
AI summary
A two-part epoxy coating composition for producing an adherent coating for articles such as large liquid storage tanks. The two-part epoxy coating composition includes a first liquid comprising a polyepoxide having a described formula and having an estrogenic agonist activity less than that of bisphenol S, and a second liquid comprising a curing agent configured to react with the polyepoxide under ambient conditions.