Can Inner Surface Coating Material for Flavor Preservation
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Solution Overview
Problem
Existing can inner surface coatings for food and beverage cans fail to prevent flavor deterioration and exhibit inadequate processability, leading to degradation of contents and corrosion issues, especially with high-alcohol or acidic contents.
Innovation Solution
A can inner surface coating material comprising a polymer with carboxy groups, a compound with functional groups capable of reacting with carboxy groups, and a liquid medium, where the number of functional groups is less than the number of carboxy groups, forming a polymer emulsion with improved adhesion and durability, suppressing component leaching and enhancing processing conformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a coating film is formed on the can inner surface to prevent contact between contents and can surface, then flavor deterioration is prevented, but components may leach from the coating film and degrade content quality
Solution Approach 1:
The coating film uses a composite material system consisting of a polymer matrix with carboxy groups and a metal complexing agent. This composite structure prevents component leaching by chemically binding metal ions through coordination chemistry, while still providing effective isolation between the can surface and contents to prevent flavor deterioration.
Solution Approach 2:
The coating film acts as an intermediary layer between the can inner surface and the contents. It not only provides physical isolation but also actively manages metal ion interactions through the metal complexing agent, preventing both direct contact corrosion and unwanted leaching into contents.
2Reliability
If a coating film is formed on the can inner surface, then corrosion prevention is improved, but processing conformability deteriorates
Solution Approach 1:
The coating composition parameters are optimized to achieve appropriate viscosity and drying characteristics. The specific formulation including polymer type, molecular weight, and metal complexing agent concentration is adjusted to ensure the coating remains workable during processing while providing adequate corrosion protection.
3Adaptability or versatility
If high-alcohol or acidic contents are stored in the can, then product variety is improved, but coating film corrosion resistance deteriorates
Solution Approach 1:
The coating film serves as a chemically active intermediary that neutralizes corrosive effects. The metal complexing agent specifically targets and binds metal ions released during corrosion, while the polymer matrix provides chemical resistance to high-alcohol and acidic environments, enabling storage of diverse products.
Solution Approach 2:
The coating formulation converts potential harmful interactions with high-alcohol and acidic contents into beneficial effects. The metal complexing agent utilizes the presence of metal ions from can corrosion to form stable complexes, effectively preventing corrosion propagation while the polymer matrix withstands the harsh chemical environment.
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 material effectively prevents flavor deterioration and improves the processability of the coating film, maintaining uniformity and durability, even under processing stress, while reducing leaching and corrosion risks.
Implementation Method 1
a polymer (A) having carboxy groups, a compound (D) having no ethylenic unsaturated bond and having one functional group (f) capable of reacting with a carboxy group
Data Source
AI summary
The disclosure provides a can inner surface coating material for forming a coating film formed on a can inner surface, wherein the coating material suppresses degradation of the contents caused by the coating film, and improves the processability of the coating film. Specifically provided is a can inner surface coating material including a polymer (A) having carboxy groups, a compound (D) having no ethylenic unsaturated bond and having one functional group (f) capable of reacting with a carboxy group, and a liquid medium, wherein the number of functional groups (f) is less than the number of carboxy groups contained in the polymer (A).