Multilayer Flame-Retardant Coating for Flexible Foam and Fabric
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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, necessitating a more effective and sustainable solution for fire-resistant coatings on foam and fabric substrates.
Innovation Solution
A multilayer thin film coating method involving alternately deposited cationic and anionic layers on substrates, using polymers, colloidal particles, and nitrogen-rich molecules to create a fire-resistant barrier that maintains the substrate's integrity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogenated materials are used as flame retardants, then flame suppression capability is improved, but environmental toxicity and harmful effects increase
Solution Approach 1:
The invention changes the chemical composition parameters by replacing halogenated compounds with phosphorus-containing compounds and nitrogen-rich compounds. This parameter change maintains flame suppression capability while eliminating environmental toxicity associated with halogenated materials.
Solution Approach 2:
The invention uses composite materials combining phosphorus-containing compounds with nitrogen-rich compounds in a multilayer coating system. This composite approach provides effective flame retardancy through synergistic interactions between different chemical components, replacing harmful halogenated materials.
2Reliability
If brominated compounds are used as flame retardants, then flame resistance is improved, but durability decreases
Solution Approach 1:
The invention segments the flame retardant system into multiple functional layers: a primer layer for substrate bonding, intermediate layers for flame retardancy, and a top layer for durability. This segmentation allows each layer to optimize for its specific function, with the top layer providing enhanced durability protection.
Solution Approach 2:
The invention changes the chemical composition to use phosphorus-containing compounds and nitrogen-rich compounds that provide both flame resistance and improved durability compared to brominated compounds. The multilayer structure further enhances durability through protective top layers.
3Productivity
If nanoparticles are used as flame retardants, then processing viscosity increases, but flame suppression capability is inadequate
Solution Approach 1:
The invention changes from using nanoparticles to using molecular-level phosphorus-containing compounds and nitrogen-rich compounds. This parameter change reduces processing viscosity while maintaining or improving flame suppression capability through chemical mechanisms rather than physical barrier effects.
Solution Approach 2:
The invention uses composite chemical systems combining phosphorus-containing compounds with nitrogen-rich compounds that provide synergistic flame suppression. This composite chemical approach achieves effective flame retardancy without the viscosity problems associated with nanoparticle suspensions.
4Reliability
If multilayer coating is applied to substrate, then flame resistance is improved, but substrate flexibility may be affected
Solution Approach 1:
The invention uses thin film multilayer coatings that are designed to be flexible and conform to the substrate. The thin film structure provides flame protection while maintaining substrate flexibility, unlike thick rigid coatings that would stiffen the substrate.
Solution Approach 2:
The invention segments the coating into multiple thin layers rather than one thick layer. This segmentation allows each thin layer to remain flexible while collectively providing robust flame protection, maintaining the substrate's original flexibility.
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 enhances flame retardancy while preserving the substrate's physical properties, such as flexibility and structure, with significant char formation and reduced combustible volatile release, demonstrating improved fire resistance and durability.
Implementation Method 1
A multilayer thin film coating method is disclosed which provides a substrate with a fire retardant coating by alternately depositing positive and negative charged layers on the substrate
Data Source
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 comprises cationic materials. The cationic materials comprise a polymer, a colloidal particle, a nanoparticle, a nitrogen-rich molecule, 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 layer comprising the anionic layer and the cationic layer. The anionic solution comprises a layerable material.