Gas-Barrier Coating Composition for Colorless Oxygen and Vapor Barriers
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Solution Overview
Problem
Existing gas-barrier coating compositions using amine compounds and carboxylic acids form yellowing coating films and require high temperatures and long times for film formation, while not adequately addressing oxygen and water vapor barrier properties.
Innovation Solution
A coating composition containing metal alkoxides, hydrolysates of metal alkoxides, metal hydroxides, and phosphoric acid compounds forms a uniform, dense crosslinked structure without yellowing, using zirconium oxide for stability and improved barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an amine compound and carboxylic acid are used as additives in the coating composition, then the coating film shows good adhesion and barrier properties, but the coating film discolors yellow due to the reaction between the amine compound and carboxylic acid
Solution Approach 1:
The invention extracts and removes the amine compound from the coating composition, eliminating the source of yellowing while maintaining the essential barrier properties through alternative additives (metal oxide, phosphoric acid compound, and carboxylic acid without amine)
Solution Approach 2:
The invention converts the potentially harmful yellowing reaction into a beneficial process by using the reaction between carboxylic acid and metal oxide to form a stable, colorless coating structure that provides both adhesion and barrier properties without discoloration
2Reliability
If the coating composition contains amine compound and carboxylic acid, then the coating film forms with good barrier properties, but high temperature and long time are required for film formation
Solution Approach 1:
The invention changes the chemical parameters of the coating composition by replacing amine compounds with metal oxides and phosphoric acid compounds, which enables the coating film to form at lower temperatures and in shorter times while maintaining excellent barrier properties against oxygen and water vapor
3Ease of manufacture
If conventional coating compositions are used, then the coating process is simple, but the oxygen barrier properties and water vapor barrier properties are not satisfactory
Solution Approach 1:
The invention uses a composite coating composition containing metal oxide particles, phosphoric acid compound, and carboxylic acid, which combines the simplicity of a liquid coating application process with superior oxygen and water vapor barrier properties through the synergistic interaction of its components
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 composition efficiently forms a colorless and transparent gas-barrier coating film with enhanced oxygen and water vapor barrier properties, suitable for retort sterilization, and can be produced at lower temperatures and in shorter times.
Implementation Method 1
containing: at least one selected from a metal alkoxide, a hydrolysate of the metal alkoxide, and a metal hydroxide
Implementation Method 2
a reaction product formed by a reaction at least between a metal oxide (A) and a phosphorus compound (B)
Data Source
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Figure 2
AI summary
The present invention relates to a gas-barrier coating composition containing a metal oxide and a phosphoric acid compound, and can provide a coating composition capable of efficiently forming a colorless and transparent gas-barrier coating film having more excellent oxygen barrier properties and water vapor barrier properties, by further blending at least one selected from a metal alkoxide, a hydrolysate of the metal alkoxide, and a metal hydroxide; and a gas-barrier laminate provided with the gas-barrier coating film (gas-barrier layer).