Thermochromic Sol-Gel Coating for Cookware Temperature Indication
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Solution Overview
Problem
Existing sol-gel coatings for cookware and other articles lack a functional indicator to guide users in their use, despite offering high temperature resistance and non-stick properties.
Innovation Solution
A sol-gel coating with a functional decoration comprising a continuous film of a metal polyalkoxylate matrix and colloidal metal oxide, topped with a thermally stable or thermochromic optically non-transparent chemical substance, providing a visible indicator that changes color or gloss with temperature, enhancing user guidance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sol-gel coating is applied to provide non-stick and high temperature resistance, then the coating durability and temperature resistance are improved, but the user lacks visual guidance on temperature and usage conditions
Solution Approach 1:
The patent incorporates thermochromic pigments into the sol-gel coating that change color in response to temperature variations. This allows the coating to provide visual feedback to users about the current temperature state, solving the information loss problem while maintaining the coating's protective functions.
Solution Approach 2:
The sol-gel coating is designed to perform multiple functions simultaneously: it provides non-stick properties, abrasion resistance, high temperature resistance, and visual temperature indication through thermochromic effects. This multi-functionality resolves the contradiction by integrating the information provision function directly into the protective coating.
2Ease of operation
If a functional decoration is added to provide temperature indication, then user guidance and safety are improved, but the coating structure becomes more complex
Solution Approach 1:
The patent merges the functional decoration (temperature indication) with the protective sol-gel coating into a single integrated layer. The thermochromic pigments are incorporated directly into the coating matrix, eliminating the need for separate indication layers or components and thus reducing overall structural complexity.
Solution Approach 2:
The coating is designed as a multi-functional single structure that simultaneously provides protection (non-stick, abrasion resistance) and information display (temperature indication). This universal design approach avoids the complexity that would arise from adding separate functional layers or components.
3Temperature
If the coating is made entirely mineral for high temperature resistance, then temperature resistance above 300°C is improved, but the coating loses flexibility and may become more brittle
Solution Approach 1:
The patent employs a hybrid sol-gel coating system that combines organic and inorganic components. The organic-modified silane precursors create a composite network structure that maintains the high temperature resistance of mineral components while incorporating organic groups that provide flexibility and reduce brittleness.
Solution Approach 2:
The coating composition is optimized by adjusting the ratio of organic to inorganic precursors, controlling the crosslinking density, and selecting appropriate alkoxide ratios. These parameter changes allow the coating to achieve both high temperature stability and adequate flexibility for practical 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 solution provides improved user guidance and safety by offering a non-stick, abrasion-resistant coating with a visible temperature indicator, enhancing cooking performance and preventing overheating or burns.
Implementation Method 1
a coating synthesized by the sol-gel route from a solution based on precursors in the liquid phase, which is transformed into a solid by a set of chemical reactions (hydrolysis and condensation), at low temperature
Implementation Method 2
a coating synthesized by the sol-gel route from a solution based on precursors in the liquid phase, which is transformed into a solid by a set of chemical reactions (hydrolysis and condensation), at low temperature
Implementation Method 3
a functional decoration which is in the form of at least one discontinuous layer comprising at least one optically non-transparent chemical substance... providing a visible indicator that changes color or gloss with temperature
Data Source
Figure 1~5
AI summary
The article e.g. frying pan (1), has a substrate i.e. hollow shell, provided with an inner face (21) and an outer face, and a sol-gel coating (3) covering one of the faces. The coating is in the form of a continuous film made of material including a matrix formed by metal polyalkoxylate and 5 weight percentage of metal oxide dispersed in the matrix, with respect to total weight of the coating. The coating is coated with a transparent functional design comprising thermostable binder, where the design is in the form of discontinuous layer containing optically non-transparent chemical substance. The optically non-transparent chemical substance is selected from a group comprising thermostable pigment, flake and/or semiconducting thermochromic pigment whose composition comprises an envelope of composite pigment grains i.e. silica shell, and a transparent and continuous solid envelope of inorganic material or hybrid organomineral material. The substrate is made of material selected from a group comprising wood, glass, ceramics and plastic material. An independent claim is also included for a method for producing an article.