Aqueous Aromatic Polymer Non-Stick Coating to Reduce Solvent Toxicity
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Solution Overview
Problem
Existing non-stick coating compositions for cooking tools and household appliances face challenges with adhesion, stability, corrosion resistance, high temperature resistance, abrasion resistance, and yellowing, particularly due to the use of toxic polar aprotic solvents which are harmful to the environment and health.
Innovation Solution
Development of aqueous semi-finished and primary non-stick coating compositions using aromatic polymers and heterocyclic polymers in powder form with controlled particle sizes and reduced polar aprotic solvent content, along with the addition of non-toxic solvents, to enhance adhesion, stability, and resistance to corrosion and abrasion while minimizing yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aromatic polymers are used in combination with PTFE colloidal dispersions with high proportion of polar aprotic solvent, then adhesion is improved, but the composition becomes toxic and harmful to environment and health
Solution Approach 1:
The patent changes the solvent content parameter from high proportion (conventional) to low proportion (less than 25% by weight), transforming the composition from toxic to non-toxic while maintaining adhesion performance through optimized aromatic polymer particle characteristics
Solution Approach 2:
The patent creates a composite aqueous composition combining aromatic polymer particles with PTFE colloidal dispersion, where the aromatic polymer particles (5-20 μm) serve as adhesive co-resin in a water-based system, replacing toxic solvents while maintaining bonding functionality
2Stability of the object's composition
If aromatic polymers are used in powder form with controlled particle size, then stability and film formation are improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the particle size parameter of aromatic polymers to 5-20 μm, which provides sufficient surface area for adhesion while ensuring stable suspension and uniform film formation, balancing performance improvement with manufacturability
Solution Approach 2:
The patent uses powder form aromatic polymers that can be easily incorporated into the aqueous composition, allowing for simple mixing and processing while achieving stable, repeatable results through controlled particle characteristics
3Object-affected harmful factors
If polar aprotic solvent content is reduced, then toxicity is reduced, but adhesion performance may deteriorate
Solution Approach 1:
The patent changes multiple parameters simultaneously: reduces solvent content to less than 25%, optimizes particle size to 5-20 μm, and selects specific aromatic polymer types, achieving non-toxic composition while maintaining adhesion through the optimized physical and chemical characteristics of the polymer particles
Solution Approach 2:
The aromatic polymer particles act as intermediary adhesive co-resin between the PTFE colloidal dispersion and the substrate, providing bonding functionality without requiring high concentrations of toxic polar aprotic solvents
Data Source
AI summary
Provided is an aqueous amine-free coating composition including at least one aromatic polymer, wherein the aromatic polymer is in the form of powder having a d90 less than or equal to 20 μm and in that the aqueous coating composition further includes polar aprotic solvent at a content greater than 0% by weight and less than or equal to 25% by weight. Also provided is an aqueous amine-free non-stick coating composition including such an aqueous composition for a coating, and the respective methods for producing same. Further provided is a method for producing an item on one of the faces of a metal substrate, from at least one layer of the coating composition or one layer of the non-stick coating composition.