Expandable Graphite Textile Composite for Burn Protection
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Solution Overview
Problem
Traditional flame-resistant protective garments for hazardous environments are often expensive, difficult to dye or print, lack abrasion resistance, and provide inadequate tactile comfort, while also being impractical for occasional flash fire exposure due to high water absorption and unsatisfactory breathability.
Innovation Solution
A lightweight, breathable, and waterproof textile composite is developed using a meltable outer textile layer combined with a thermally stable convective barrier and a heat reactive material comprising a polymer resin-expandable graphite mixture, which reduces afterflame time and char length, and enhances burn protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inherently flame resistant fibers (aramids, PBI, PBO) are used for protective garments, then burn protection is improved, but cost increases significantly and tactile comfort deteriorates
Solution Approach 1:
The patent uses a composite structure combining a meltable outer textile layer (nylon or polyester) with a heat reactive material layer (polymer resin-expandable graphite mixture) to achieve flame resistance. This composite approach allows the use of comfortable, breathable fabrics while adding burn protection through the heat reactive layer that expands to form an insulating barrier when exposed to flame.
Solution Approach 2:
The patent changes the physical and chemical parameters of the textile by treating it with a heat reactive material comprising polymer resin and expandable graphite. The expandable graphite particles expand when heated, changing the material's density, volume, and thermal properties to provide flame resistance without requiring inherently flame resistant fibers.
2Reliability
If inherently flame resistant fibers are used, then burn protection is improved, but ease of manufacture deteriorates due to difficulty in dyeing and printing
Solution Approach 1:
The heat reactive material is applied to the outer textile layer in advance, before the garment needs to be dyed or printed. This preliminary treatment allows subsequent dyeing and printing operations to be performed on the base textile without interfering with the flame protective properties, as the heat reactive material is applied as a coating rather than being an integral part of the fiber structure.
3Reliability
If inherently flame resistant fibers are used, then burn protection is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent creates a composite where the outer textile layer can be made from durable, abrasion-resistant materials like nylon or polyester, while the heat reactive material layer provides the burn protection. This separates the functions of abrasion resistance (handled by the base textile) and flame resistance (handled by the heat reactive coating).
4Reliability
If traditional flame resistant textiles are used, then burn protection is improved, but productivity deteriorates due to high water absorption and poor breathability
Solution Approach 1:
The patent changes the thermal and moisture parameters of the protective garment by using a heat reactive coating instead of inherently flame resistant fibers. The base textile can be selected for optimal breathability and moisture management, while the heat reactive layer provides flame protection without significantly impeding these properties under normal conditions.
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 textile composite achieves a significant reduction in afterflame time and char length, improved comfort, and enhanced burn protection while maintaining breathability and affordability, making it suitable for hazardous environments.
Implementation Method 1
the expandable graphite has an expansion of at least 900 μm upon heating to 280° C.
Implementation Method 2
an endotherm greater than 100 J/g
Implementation Method 3
the heat reactive material comprises a polymer resin-expandable graphite mixture, and wherein the expandable graphite has an expansion greater than 9 cc/g and an endotherm greater than 100 J/g
Data Source
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.