Open Cell Polyurea Foam Fire Retardancy
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Solution Overview
Problem
Modern building codes require spray foams to pass stringent fire tests such as ASTM E-84 and Appendix X, which existing spray foams often fail to meet without the use of costly and complex intumescent coatings, necessitating the development of fire-retardant formulations that enhance fire performance without increasing installation complexity.
Innovation Solution
An open cell spray polyurea foam formulation incorporating a saccharide fire retardant, such as sucrose, as an unreacted filler, combined with additional fire retardants like ammonium polyphosphate, to achieve fire retardancy sufficient for passing ASTM E-84 and Appendix X tests, while maintaining excellent insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intumescent coatings are applied to spray foam insulation, then fire retardancy is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines fire retardant functionality directly into the spray foam formulation by incorporating unreacted saccharide filler and fire retardant chemicals (such as ammonium polyphosphate and brominated compounds). This integration eliminates the need for separate intumescent coating applications, thereby maintaining fire retardancy while reducing installation complexity and cost.
Solution Approach 2:
The spray foam formulation is designed to be self-retardant through the inclusion of unreacted saccharide filler and fire retardant chemicals that inherently provide fire protection. The foam itself serves the fire retardancy function without requiring external coatings or additional protective measures, thereby simplifying the overall system.
2Reliability
If fire retardants are added to foam formulation, then fire performance is improved, but manufacturing cost increases
Solution Approach 1:
The unreacted saccharide filler serves multiple functions: it acts as a fire retardant, provides insulation, and maintains the foam's structural properties. This multi-functionality reduces the need for additional specialized fire retardant additives, thereby controlling formulation cost while achieving required fire performance.
Solution Approach 2:
The patent utilizes common, cost-effective fire retardant chemicals such as ammonium polyphosphate and brominated compounds at optimized concentrations. By carefully selecting and dosing these materials, the formulation achieves necessary fire performance ratings while minimizing the impact on overall manufacturing cost.
3Reliability
If unreacted filler is used as fire retardant, then fire retardancy is achieved, but foam density increases
Solution Approach 1:
The unreacted saccharide filler is distributed throughout the foam matrix, providing fire retardancy locally at multiple points. This distributed approach allows the foam to maintain its overall lightweight structure while achieving effective fire protection through the cumulative effect of numerous small fire-retardant sites throughout the material.
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 formulation effectively passes fire tests by utilizing unreacted saccharides and additional fire retardants, providing enhanced fire retardancy without the need for intumescent coatings, thus simplifying installation and reducing costs while maintaining high insulation values.
Implementation Method 1
The polyurea may be a reaction product of an isocyanate compound and water
Implementation Method 2
The majority of the filler may exist in the spray foam formulation may be unreacted and may function as a first fire retardant
Data Source
AI summary
An open cell spray polyurea foam for use in an insulation layer in a wall structure may include a polyurea. The polyurea may be a reaction product of an isocyanate compound and water. The open spray polyurea foam may also include a filler. The majority of the filler may exist in the spray foam formulation as an unreacted first fire retardant. The spray foam formulation may further comprise a second fire retardant, and the insulation layer may exhibit a fire retardancy sufficient to pass Appendix X and/or ASTM E-84.