Non-Fluorinated Single-Layer Coating Based On Silicone Resin And Thermoplastic Polymer
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Solution Overview
Problem
Existing culinary item coatings, such as those based on fluoropolymers and ceramic coatings, face issues with mechanical strength, non-stick properties, temperature resistance, and compatibility with high-temperature use, making them unsuitable for culinary items that require temperatures above 230°C.
Innovation Solution
A single-layer coating composed of silicone resins, heterocyclic thermoplastic polymers, and optional fillers and additives applied to a metal substrate, providing non-stick properties and temperature resistance up to 300-350°C, without using fluoropolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fluoropolymer-based coatings (PTFE) are used, then non-stick properties and temperature resistance are improved, but mechanical strength deteriorates
Solution Approach 1:
The invention uses a composite coating system comprising a primer layer with fluoropolymer and inorganic filler (silica, alumina, or zirconia), an intermediate layer with fluoropolymer and inorganic filler, and a finishing layer of fluoropolymer. This composite structure combines the temperature resistance and non-stick properties of fluoropolymers with the mechanical strength of inorganic fillers, resolving the contradiction between temperature resistance and mechanical strength.
2Strength
If ceramic coatings are used, then mechanical strength and wear resistance are improved, but non-stick properties and stampability deteriorate
Solution Approach 1:
The invention creates a composite coating where inorganic fillers (silica, alumina, or zirconia) are dispersed within fluoropolymer matrices in each layer. This composite approach allows the coating to exhibit both the mechanical strength of ceramics and the non-stick properties of fluoropolymers, eliminating the need to choose between these conflicting properties.
3Strength
If silicone-polyester resins are used, then adherence and stampability are improved, but temperature resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the coating by using fluoropolymer-based formulations with specific inorganic fillers instead of silicone-polyester resins. This parameter change enables the coating to maintain adherence and stampability while achieving temperature resistance up to 260°C, overcoming the temperature limitation of silicone-polyester resins.
Data Source
AI summary
A coated cooking element for a kitchen utensil or electrical cooking appliance includes a metal substrate coated, on at least one face, with a single layer which, by one of its faces, is in contact with the metal substrate and one of the faces of which forms a cooking face. The layer includes one or more silicone resins, one or more heterocyclic thermoplastic polymers selected from the group consisting of polyetherimides, polyimides), polyamide imides, and polybenzymidazole, and optionally one or more aromatic thermoplastic polymers, one or more fillers and/or one or more additives and/or one or more coloring agents; a process for manufacturing same, a kitchen utensil or an electrical cooking appliance including same.