Expandable Graphite Textile Composite for Flash Fire Protection
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Solution Overview
Problem
Traditional flame-resistant protective garments for hazardous environments are expensive, difficult to dye and print, lack abrasion resistance, and provide unsatisfactory tactile comfort, while being impractical for occasional flash fire exposure due to high water absorption and cost constraints.
Innovation Solution
A flame-resistant textile composite comprising a meltable outer textile with a heat reactive material of polymer resin and expandable graphite, which expands upon heating, and a thermally stable convective barrier, enhancing break-open time and reducing afterflame, while being breathable, waterproof, and comfortable to wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional inherently flame resistant fibers (aramids, PBI, PBO) are used, then flame resistance is improved, but cost increases significantly
Solution Approach 1:
The patent combines conventional textile fibers with expandable graphite particles to create a composite material that achieves flame resistance without using expensive inherently flame resistant fibers. The expandable graphite provides thermal protection when exposed to fire, while the base fabric can be made from cost-effective materials like cotton or synthetic blends.
Solution Approach 2:
The patent changes the thermal response parameters of the fabric by incorporating expandable graphite, which undergoes a phase change at elevated temperatures. The graphite expands rapidly when heated, creating an insulating barrier that protects the wearer, thereby achieving flame resistance through parameter modification rather than using inherently flame resistant fibers.
2Reliability
If traditional flame resistant fibers are used, then flame resistance is improved, but tactile comfort deteriorates due to higher water absorption
Solution Approach 1:
By creating a composite of conventional fibers and expandable graphite, the patent maintains the hygroscopic properties of natural or synthetic fibers (which provide comfort) while adding flame protective capabilities. The expandable graphite particles are distributed within the fabric structure to provide thermal protection without interfering with the moisture management properties of the base fabric.
3Reliability
If traditional flame resistant fibers are used, then flame resistance is improved, but ease of dyeing and printing deteriorates
Solution Approach 1:
The composite structure allows the base fabric to retain its original dyeing and printing characteristics while the expandable graphite provides flame resistance. Conventional fibers in the composite can be dyed and printed using standard textile processes, unlike inherently flame resistant fibers that have limited colorfastness and printing options.
4Reliability
If traditional flame resistant fibers are used, then flame resistance is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent creates a composite where the structural integrity and mechanical properties are maintained by the base fabric, while flame protection is provided by the expandable graphite. This allows selection of base fabrics with good abrasion resistance, unlike some inherently flame resistant fibers that may be more fragile.
5Reliability
If expandable graphite heat reactive material is added to meltable outer textile, then break-open time is improved, but device complexity increases
Solution Approach 1:
The patent modifies the thermal parameters of the outer textile by incorporating expandable graphite, which changes its physical state at elevated temperatures. This parameter change extends the time before the material fails under fire exposure, achieving improved break-open time through material property modification rather than adding complex structural elements.
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 solution provides a lightweight, breathable, and affordable flame-resistant garment with improved break-open time and reduced afterflame, offering enhanced protection and comfort for workers in hazardous environments.
Implementation Method 1
an expandable graphite that expands at least 900 μm upon heating to 280°C
Implementation Method 2
a heat reactive material comprising a polymer resin and an expandable graphite that expands at least 900 μm upon heating to 280°C
Data Source
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AI summary
A method is described for reducing the afterflame of a flammable, meltable material. A textile composite is described comprising an outer textile comprising a flammable, meltable material, and a heat reactive material comprising a polymer resin-expandable graphite mixture.