Improved Non-Stick Coating
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Solution Overview
Problem
Non-stick coatings for household articles, particularly cookware, experience color change issues during high-temperature manufacturing processes due to degradation of fluoropolymer-based coatings, leading to visible yellowing, especially when light-colored decorations are applied.
Innovation Solution
Incorporating (Bi1-xAx)(V1-yMy)O4 compounds, such as bismuth vanadate, into the coating layers to prevent color change by acting as a protective agent, where x and y vary within specified ranges, and A and M are chosen from specific metal groups, allowing the compound to be present in various forms and concentrations within the coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymer-based coatings with bonding resins and additives are used during high-temperature manufacturing, then the non-stick properties and adhesion are improved, but the coating undergoes degradation and yellowing occurs
Solution Approach 1:
The patent introduces (Bi1-xAx)(V1-yMy)O4 compounds as intermediary substances that act as protective agents between the bonding resins/additives and the decorative coat. This intermediary layer prevents the degradation by-products from reaching and yellowing the light-colored decoration, while still allowing the bonding resins to perform their adhesion function.
Solution Approach 2:
The patent converts the harmful high-temperature degradation process into a beneficial protective mechanism. The (Bi1-xAx)(V1-yMy)O4 compound undergoes thermal degradation itself to form a protective barrier that prevents the degradation by-products from affecting the decorative coat, thereby transforming the harmful thermal effect into a protective action.
2Strength
If bonding resins and organic additives are incorporated into the coating, then adhesion and coating integrity are improved, but degradation by-products are generated during sintering
Solution Approach 1:
The (Bi1-xAx)(V1-yMy)O4 compound serves as an intermediary barrier that separates the bonding resins from the decorative coat. It allows the bonding resins to maintain their adhesion function while preventing their degradation by-products from migrating to and affecting the decorative layer.
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific ratios of (Bi1-xAx)(V1-yMy)O4 compounds. By adjusting the values of x and y within specified ranges, the compound's thermal stability and protective efficiency are optimized to prevent by-product formation while maintaining adhesion.
3Ease of manufacture
If light-colored decoration is applied between primer coats and finish coat, then aesthetic appearance is improved, but yellowing becomes more visible during manufacturing
Solution Approach 1:
The (Bi1-xAx)(V1-yMy)O4 compound is positioned as an intermediary protective layer between the bonding coat and the light-colored decorative coat. This intermediary layer specifically protects the aesthetic appearance of light-colored decorations by blocking the degradation by-products that would otherwise cause visible yellowing.
Solution Approach 2:
The patent applies the (Bi1-xAx)(V1-yMy)O4 compound specifically in the bonding coat layer where it is most needed - between the primer and decorative coats. This localized application provides targeted protection to the light-colored decoration without affecting other properties of the overall coating system.
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 use of (Bi1-xAx)(V1-yMy)O4 effectively reduces or prevents visible color change during the manufacturing process, protecting the initial color of the coating and any superposed coatings, maintaining the appearance of the non-stick coatings.
Implementation Method 1
BiVO4 can be used to completely break down methylbenzene by combining a temperature reaction and under light irradiation. Nevertheless, it is not mentioned that BiVO4 allows only a thermal degradation of methylbenzene
Implementation Method 2
The compound BiVO4 is currently known as a photocatalyst making it possible to degrade organic compounds and therefore remove pollution from the atmosphere. However, to be active, this catalyst requires light.
Implementation Method 3
The inventors have actually observed that a yellow decoration can be obtained by adding BiVO4 without degrading the initial colour. BiVO4 therefore protects the colour of the coat in which it is added.
Data Source
AI summary
The purpose of the present invention is the use of (Bi1-xAx)(V1-yMy)04 in a non-stick coating for a household article so as to reduce or prevent the color change of said coating during the manufacturing process thereof, characterised in that: —x is equal to 0 or x is from 0.001 to 0.999; —y is equal to 0 or y is from 0.001 to 0.999; —A and Mare selected from the group consisting of nitrogen, phosphorus, an alkali metal, an alkaline earth metal, a transition metal, a poor metal, a metalloid or a lanthanide; —A and M are different from each other.