Siloxane Glucoside Surfactant Foam for Fire Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fluorine-free firefighting foams fail to meet the stringent U.S. Military Specification (MilSpec) requirements for fire extinguishing, as they lack the low surface tension necessary for effective aqueous film formation, leading to reduced fire suppression performance compared to fluorocarbon-based AFFF formulations.
Innovation Solution
A fluorine-free surfactant composition comprising a combination of poly(oxyethylene)-trisiloxane and poly(glucoside)-alkane surfactants, which form a foam layer that effectively suppresses fuel vapors and extinguishes hydrocarbon pool fires with a smaller amount of solution, leveraging synergistic interactions to enhance fuel vapor resistance and foam stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorine-free surfactants are used to eliminate environmental hazards, then environmental safety is improved, but fire suppression performance deteriorates due to inability to achieve extremely low surface tension
Solution Approach 1:
The patent combines fluorine-free surfactants with viscosity modifying additives and hydrocarbon surfactants to create a composite formulation that achieves both environmental safety and adequate fire suppression performance through synergistic interactions between components
Solution Approach 2:
The patent modifies physical parameters of the foam formulation by adjusting viscosity through viscosity modifying additives to compensate for the loss of aqueous film formation, thereby maintaining foam stability and fire suppression effectiveness without fluorocarbons
2Stability of the object's composition
If viscosity modifying additives are used to reduce drainage and hold more water in foam layer, then foam stability is improved, but fire suppression performance deteriorates due to excess solution requirement
Solution Approach 1:
The patent optimizes the viscosity parameter within specific ranges to achieve adequate foam stability without excessive viscosity that would require excess solution, balancing foam hold time with application efficiency
Solution Approach 2:
The patent replicates the functional effects of fluorocarbon surfactants using combinations of fluorine-free surfactants and viscosity modifiers that mimic the low surface tension and foam stability characteristics without requiring excessive solution volumes
3Object-affected harmful factors
If hydrocarbon surfactants are used to replace fluorocarbon surfactants, then environmental safety is improved, but fuel resistance deteriorates leading to reduced fire suppression effectiveness
Solution Approach 1:
The patent creates a composite surfactant system combining hydrocarbon surfactants with fluorine-free surfactants and viscosity modifying additives to achieve synergistic fuel resistance that exceeds the performance of individual components
Solution Approach 2:
The patent assigns different functional roles to different surfactant components in the formulation, with hydrocarbon surfactants providing bulk foam stability and fluorine-free surfactants contributing to surface tension reduction and fuel vapor resistance at the foam-fuel interface
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 surfactant formulation achieves fire suppression performance comparable to AFFF, with improved fuel vapor resistance and reduced foam degradation, allowing for faster fire extinguishment using less solution, while adhering to environmental regulations by eliminating fluorocarbons.
Implementation Method 1
fluorocarbon surfactants reduce the surface tension to an extremely low value
Implementation Method 2
form a foam layer that effectively suppresses fuel vapors
Implementation Method 3
the aqueous film under the foam layer that seals off fuel vapors emerging from the pool surface
Data Source
AI summary
Disclosed is a firefighting composition of the surfactants below and water. The values of m, n, x, and y are independently selected positive integers. R is an organic group. R′ is a siloxane group.