Household Article Comprising A Sol-Gel Non-Stick Coating With A Finish Layer Free Of Silica And Of Colloidal Metal Oxide
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Solution Overview
Problem
Sol-gel non-stick coatings deteriorate over time due to the addition of colloidal silica, leading to a decrease in non-stick properties and mechanical durability, especially when exposed to boiling water.
Innovation Solution
A finish layer for sol-gel non-stick coatings is developed without silica or colloidal metal oxide, maintaining non-stick characteristics and mechanical properties through the use of a sol-gel composition with specific metal alkoxide precursors and catalysts, ensuring optical transparency and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If colloidal silica is added to sol-gel coating formulations to obtain high mechanical resistance and crack-free coating, then mechanical strength is improved, but non-stick durability deteriorates due to hydrolysis of sol-gel network when exposed to boiling water
Solution Approach 1:
The invention removes colloidal silica from the finish layer formulation while maintaining it in the base layer. This extraction from the critical finish layer prevents hydrolysis-induced non-stick property degradation during boiling water exposure, while the base layer still provides mechanical support and crack resistance.
Solution Approach 2:
The coating is divided into two distinct layers with different compositions: a base layer containing colloidal silica for mechanical strength, and a finish layer without colloidal silica for non-stick durability. This segmentation allows each layer to optimize its specific function without compromising the other.
2Duration of action of stationary object
If colloidal silica is added to achieve coating thickness of several microns without cracks, then mechanical durability is improved, but non-stick properties decrease over time especially after prolonged contact with boiling water
Solution Approach 1:
The coating system is segmented into a thick base layer (several microns) containing colloidal silica that provides crack resistance and durability, and a thin finish layer without colloidal silica that maintains non-stick properties. The base layer's durability prevents cracks from propagating through the coating, while the finish layer's silica-free composition prevents hydrolysis and non-stick degradation.
Solution Approach 2:
Colloidal silica is extracted from the finish layer formulation to eliminate the source of hydrolysis that causes non-stick property deterioration during boiling water exposure, while the base layer retains colloidal silica for structural integrity and long-term durability.
3Reliability
If silicone oil is added to compensate for decrease in non-stick properties, then non-stick performance is temporarily improved, but overall durability remains limited and unsatisfactory
Solution Approach 1:
The invention takes out colloidal silica from the finish layer to eliminate the root cause of non-stick property deterioration (hydrolysis), providing long-term durability without relying on temporary silicone oil additions. This addresses both non-stick performance and overall durability simultaneously.
Solution Approach 2:
The finish layer is formulated without colloidal silica from the beginning to prevent hydrolysis and non-stick property degradation before it occurs, rather than attempting to compensate for deterioration after it happens with silicone oil additions.
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 retains superior non-stick properties and mechanical durability, extending the lifespan of household articles and providing enhanced user satisfaction with improved resistance to abrasion and thermal stress.
Implementation Method 1
the addition of colloidal or micronic silica is unfavorable for the durability of the non-stick coating, in particular after prolonged contact with boiling water of the household article, by promoting the hydrolysis of part of the sol-gel network
Data Source
AI summary
The present invention therefore relates to a sol-gel finish layer of a non-stick coating of a household article, said layer forming a cooking surface and being free of silica and of colloidal metal oxide.