FDA Epoxy Coating With Benzyl Alcohol–Ethanol Cure Balance
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Solution Overview
Problem
Existing coatings used in FDA-approved applications lack improved cure profiles, flexibility, and adhesion, particularly when exposed to food and beverage products, leading to brittleness and poor performance.
Innovation Solution
A unique combination of benzyl alcohol and ethanol with a low viscosity bisphenol F-based epoxy resin, cured with isophorone diamine (IPDA) and polyamide, enhances adhesion and flexibility, while maintaining compatibility and reducing brittleness, allowing for ambient or elevated temperature curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional epoxy coatings are used in FDA-approved applications, then they provide basic protective properties, but they exhibit brittleness and poor adhesion when exposed to food and beverage products
Solution Approach 1:
The patent modifies the chemical composition parameters of the epoxy coating by incorporating specific plasticizers and adhesion promoters in controlled amounts. This changes the physical properties of the cured coating, reducing brittleness and improving adhesion to substrates exposed to food and beverage products while maintaining FDA compliance.
Solution Approach 2:
The patent creates a composite coating formulation by combining epoxy resin with multiple functional additives including plasticizers, adhesion promoters, and curing agents. This composite approach allows the coating to simultaneously achieve flexibility, adhesion, and chemical resistance required for food contact applications.
2Reliability
If the coating is made more flexible to reduce brittleness, then adhesion improves, but cure profile and hardness may be compromised
Solution Approach 1:
The patent carefully adjusts the concentration parameters of plasticizers and curing agents to achieve the optimal balance between flexibility and cure characteristics. By controlling the amount and type of plasticizer incorporated, the coating achieves improved flexibility and reduced brittleness while maintaining an acceptable cure profile and hardness for food contact applications.
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 and flexibility, with reduced brittleness, suitable for FDA-approved applications, and can be applied via airless or plural component spray, ensuring effective coating performance on various substrates.
Implementation Method 1
an epoxy resin; an amine curing agent
Implementation Method 2
The use of both benzyl alcohol and ethanol increases the cure of IPDA
Implementation Method 3
curing the epoxy resin
Data Source
AI summary
A coating composition includes an epoxy resin (e.g., a bisphenol F-based, bisphenol A-based, and/or novolac-based epoxy resin), an amine curing agent (e.g., an aromatic or cycloaliphatic amine and an amide), ethanol, and benzyl alcohol. A weight ratio of ethanol to benzyl alcohol may be in a range of about 0.28 to about 12. A coating process includes forming the coating composition, depositing the coating composition on a substrate, optionally at least partially drying the deposited coating composition, and curing the coating composition. An article includes a substrate and a coating layer formed from the coating composition.