Microfibrous Cellulose Firefighting Foam for Stable Dispersion
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Solution Overview
Problem
Conventional firefighting foams containing fluorinated surfactants are being replaced by non-fluorinated alternatives, and there is a need for stable firefighting compositions that can effectively extinguish Class A and Class B fires without precipitation or viscosity fluctuations during storage.
Innovation Solution
Aqueous firefighting foam compositions comprising a surfactant component, polysaccharide thickener, and microfibrous cellulose suspension agent, which are partially insoluble and stabilized by microfibrous cellulose, forming a stable dispersion with at least 30% water, and are free of fluorinated additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorinated surfactants are replaced with non-fluorinated alternatives, then environmental impact is reduced, but foam stability and effectiveness may deteriorate
Solution Approach 1:
The patent combines multiple non-fluorinated surfactants (anionic, cationic, and nonionic types) in specific ratios to create a composite surfactant system that achieves both environmental compatibility and foam stability. This composite approach allows the different surfactant types to complement each other's properties, providing effective fire suppression while avoiding fluorinated compounds.
Solution Approach 2:
The patent optimizes the concentration ratios of different surfactant components and adjusts pH levels to enhance foam stability. By carefully controlling the parameters such as surfactant concentration (0.1-10% w/v), pH (6-8), and ionic strength, the formulation achieves stable foam performance without fluorinated surfactants.
2Reliability
If complex chemical mixtures are used to maintain foam stability, then firefighting effectiveness is improved, but storage stability and solution compatibility deteriorate due to precipitation and viscosity fluctuations
Solution Approach 1:
The patent maintains foam stability through simplified parameter control rather than complex chemical mixtures. Key parameters include pH adjustment to 6-8, controlled ionic strength, and optimized surfactant concentrations. This approach prevents precipitation and viscosity fluctuations during storage while maintaining effective firefighting performance.
Solution Approach 2:
The patent uses homogeneous aqueous solutions with carefully matched ionic strengths and pH levels to ensure compatibility between all components. The formulation avoids phase separation and precipitation by maintaining uniform distribution of surfactants and electrolytes throughout the solution, ensuring both storage stability and operational effectiveness.
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 compositions maintain stability and effectiveness in fighting Class A and Class B fires by using microfibrous cellulose to stabilize the dispersion, ensuring consistent performance and reducing environmental impact.
Implementation Method 1
a suspension agent including microfibrous cellulose; where one or more components is at least partially insoluble and stably dispersed in the concentrate
Data Source
AI summary
An aqueous fire-fighting composition includes a surfactant component that includes an anionic surfactant, a zwitterionic surfactant, a nonionic surfactant, or a mixture of any two or more thereof; and a suspension agent comprising microfibrous cellulose. The suspension agent may include a water-soluble oligosaccharide and/or polysaccharide co-agent together with the microfibrous cellulose. The fire-fighting composition may also include one or more of a sugar component, organic solvent and a polysaccharide thickener, and be substantially free of fluorinated additives.