Multilayer Flame-Retardant Coating for Flexible Foam Substrates
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Solution Overview
Problem
Current flame retardant materials, such as halogenated compounds and nanoparticles, face issues like environmental toxicity, durability concerns, and inadequate flame suppression, while existing methods for coating substrates with fire-resistant materials do not significantly enhance flame resistance beyond the substrate itself.
Innovation Solution
A multilayer thin film coating method involving alternately depositing positive and negative charged layers on substrates, using cationic and anionic solutions containing polymers and nanoparticles, to create a bilayer coating that enhances flame resistance in materials like foam and fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogenated flame retardant materials are used, then flame resistance is improved, but environmental toxicity and harmful effects increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing halogenated compounds with phosphorus-containing flame retardants and incorporating metal hydroxides (aluminum, magnesium, zinc). This parameter substitution maintains flame resistance while eliminating toxic environmental effects associated with halogenated materials.
Solution Approach 2:
The invention uses composite materials combining multiple flame retardant components: phosphorus-containing compounds, metal hydroxides (Al(OH)3, Mg(OH)2, Zn(OH)2), and nitrogen-containing additives. This composite approach achieves effective flame suppression without the environmental toxicity of single-component halogenated systems.
2Reliability
If brominated flame retardant compounds are used, then flame resistance is improved, but durability decreases
Solution Approach 1:
The patent changes the chemical stability parameters by using phosphorus-containing compounds and metal hydroxides that form stable, durable coatings on substrates. These materials provide long-lasting flame protection without the degradation issues associated with brominated compounds.
Solution Approach 2:
The invention employs readily available, cost-effective flame retardant materials (phosphorus compounds, common metal hydroxides) that can be easily applied and provide sustained protection, replacing expensive and less durable brominated alternatives.
3Reliability
If nanoparticles are used for flame retardancy, then flame suppression is improved, but processing viscosity and modulus increase
Solution Approach 1:
The patent applies flame retardant materials locally as surface coatings rather than incorporating nanoparticles throughout the bulk material. This localized application provides effective flame suppression at the surface level while avoiding the increased viscosity and processing difficulties associated with nanoparticle dispersion in the bulk polymer.
Solution Approach 2:
The invention uses binding agents and coating formulations as intermediaries to apply flame retardant materials to substrate surfaces. This intermediary approach enables effective flame protection without directly incorporating nanoparticles into the base material, thereby avoiding viscosity increases.
4Reliability
If nanoparticles are used for flame retardancy, then flame suppression is improved, but melt-dripping resistance is inadequate
Solution Approach 1:
The patent uses composite materials containing phosphorus-containing compounds combined with metal hydroxides and nitrogen-containing additives. This composite formulation promotes char formation and melt-dripping resistance while maintaining flame suppression, overcoming the inadequate melt-dripping protection observed with nanoparticle-only systems.
Solution Approach 2:
The invention utilizes phase transition mechanisms where phosphorus-containing compounds and metal hydroxides promote char formation and foaming during combustion. This phase change approach creates a protective barrier that prevents melt-dripping while maintaining effective flame suppression.
5Reliability
If plasma polymerization is used to coat substrates with fire retardant materials, then flame resistance is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex plasma polymerization equipment and processes with simpler dip-coating or spray-coating methods. The flame retardant coating is applied using conventional, easily implementable techniques while maintaining effective flame resistance, thereby reducing device and process complexity.
Solution Approach 2:
The invention uses simple, readily available coating formulations that can be applied with basic equipment rather than requiring complex plasma polymerization systems. This approach provides effective flame protection through economical, low-complexity application methods.
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 method effectively increases the flame resistance of substrates by producing a significant char residue during burning, reducing after-flame times, and preserving the fabric structure, while maintaining the physical properties and flexibility of the materials.
Implementation Method 1
a method for coating a substrate to provide a flame resistant substrate. The method includes exposing the substrate to a cationic solution to produce a cationic layer deposited on the substrate... exposing the cationic layer to an anionic solution to produce an anionic layer deposited on the cationic layer
Data Source
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AI summary
A method includes coating a substrate to provide a flame resistant substrate. In an embodiment, the method includes exposing the substrate to a cationic solution to produce a cationic layer deposited on the substrate- The cationic solution includes cationic materials. The cationic materials include polymers, nanoparticles, or any combinations thereof. The method further includes exposing the cationic layer to an anionic solution to produce an anionic layer deposited on the cationic layer to produce a bilayer. The bilayer is the anionic layer and the cationic layer. The anionic solution includes layerable materials.