Fluoropolymer-based coating comprising a temperature indicator
Solution Overview
Problem
Existing thermal indicators on cookware are difficult to understand and provide unclear temperature changes, making it hard for users to assess the temperature accurately, especially for those without specialized training.
Innovation Solution
A fluoropolymer-based coating with two distinct decorations, one containing a thermochromic (Bi1-xAx)(V1-yMy)O4 type pigment and another with a temperature reference pigment, ensuring a clear and contrasting color change over a precise temperature range, allowing easy identification of optimal usage temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal indicator is formulated in a non-stick coating, then temperature indication function is achieved, but the visibility and clarity of temperature change is poor
Solution Approach 1:
The coating is divided into multiple layers: a non-stick coating layer containing the thermochromic pigment, a clear topcoat layer for protection and enhanced visibility, and optionally a basecoat layer. This segmentation allows the thermochromic function to be preserved while improving visual detection through the transparent topcoat.
Solution Approach 2:
A clear topcoat layer is introduced as an intermediary between the thermochromic pigment and the external environment. This topcoat enhances the visibility of the color change while protecting the pigment, acting as a mediator that improves both detection clarity and durability.
2Measurement precision
If a thermostable control is incorporated separately from the non-stick coating, then relative color change control is achieved, but integration and clear visibility of temperature change is compromised
Solution Approach 1:
The thermochromic pigment is directly integrated into the non-stick coating layer itself, merging the temperature indication function with the non-stick coating. This integration ensures that the color change occurs exactly where needed and is clearly visible through the transparent topcoat, eliminating the need for separate control mechanisms.
3Loss of information
If existing thermal indicators are used, then temperature indication is provided, but readability and ease of understanding for users without specialized training is poor
Solution Approach 1:
A thermochromic pigment is selected that exhibits a strong, distinct color change at the target temperature threshold. The pigment transitions from one clearly distinguishable color to another, making it easy for users to visually detect when the optimal temperature is reached without requiring specialized knowledge.
Solution Approach 2:
The thermochromic pigment's transition temperature and color characteristics are optimized to match the specific cooking requirements. By adjusting the pigment parameters, the indicator provides clear visual feedback at the desired temperature point, enhancing user understanding and ease of operation.
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 provides improved readability and understanding of temperature changes, enabling precise temperature control during cooking and preventing overheating, with the pigments exhibiting reversible thermochromic properties and stability up to 450°C.
Implementation Method 1
a decoration comprising at least one thermochromic pigment composition in the form of particles consisting of a (Bi1-xAx)(V1-yMy)O4 type pigment
Data Source
AI summary
The present invention relates to a fluoropolymer-based coating of the surface of a household article comprising at least two decorations (a) and (b) arranged between or in its layers, wherein: (a) is a decoration comprising at least one thermochromic pigment composition in the form of particles consisting of a (Bi1-xAx) (V1-yMy)O4 type pigment, where: —x is 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 M are 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; and (b) is a decoration comprising a temperature reference pigment composition.