Bisphenol A-Free Primer and Topcoat for Water Systems
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Solution Overview
Problem
Existing epoxy-based coatings containing bisphenol A pose a health risk in applications involving potable water and lack sufficient corrosion resistance and adhesion, necessitating a bisphenol A-free alternative with enhanced protective properties.
Innovation Solution
A coating system comprising a primer and a topcoat, where the primer is made from a resinous binder derived from ethylenically-unsaturated monomers, epoxidized polyolefin, and polyamide, and the topcoat from polyamide monomers, providing improved corrosion resistance and adhesion without bisphenol A.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy-based coatings containing bisphenol A are used, then good corrosion resistance and adhesion are achieved, but health safety deteriorates due to estrogenic properties
Solution Approach 1:
The patent removes the harmful bisphenol A component from the coating system while maintaining the protective functionality through alternative polymer compositions (polyester, vinyl, acrylic resins) combined with specific metal powders and curing agents that achieve comparable or superior corrosion resistance without the estrogenic health risks
Solution Approach 2:
The invention creates a composite coating system combining multiple polymer types (polyester, vinyl, acrylic), metal powders (aluminum, zinc, magnesium, silicon dioxide), and curing agents (polyisocyanates, polyamines) to achieve the desired balance of corrosion protection, adhesion, and health safety without relying on bisphenol A
2Reliability
If conventional coating systems are used, then application simplicity is maintained, but corrosion resistance and adhesion are insufficient
Solution Approach 1:
The coating system is divided into distinct functional components: polymer resin base, metal powder additives, and curing agents, allowing each component to be optimized independently for corrosion resistance and adhesion while maintaining overall system manageability and application feasibility
Solution Approach 2:
The patent modifies key coating parameters by substituting traditional epoxy resins with alternative polymers (polyester, vinyl, acrylic), adjusting metal powder compositions and ratios, and optimizing curing agent selections to enhance corrosion resistance and adhesion properties while maintaining coating applicability
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 system offers superior corrosion resistance and adhesion to metal substrates, particularly in water-treatment and transportation systems, while being free from harmful bisphenol A derivatives.
Implementation Method 1
better adhesion to the metal substrate
Implementation Method 2
higher corrosion resistance
Data Source
AI summary
The invention relates to the field of coatings for protecting varions articles against corrosion, especially parts of a water-treatment or water transportation system. More particularly, the invention relates to a coating comprising a primer and a topcoat, to a coated article comprising this coating, and to a process for manufacturing the same.