Graphene-Coated Inflatable Fabric for High-Pressure Weight Reduction
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Solution Overview
Problem
Conventional inflatable aircraft evacuation slides are heavy due to the weight of their fabric, which limits their weight reduction efforts, as increasing inflation pressure to reduce size increases stress on the fabric, and current materials do not effectively balance strength and weight.
Innovation Solution
A lightweight, high-strength inflatable structure using a flexible fabric coated with a polyurethane resin containing graphene nanoplatelets and a phosphorus-based flame retardant, which improves tensile and gas barrier properties without additional dispersants, reducing the need for heavier gauge materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the physical size of structural members is reduced by increasing inflation pressure, then the size of the evacuation slide is reduced, but the stress on the slide fabric increases requiring heavier gauge material
Solution Approach 1:
The patent applies composite materials by combining ultra-high-tenacity nylon fibers with advanced polyurethane coatings and nanocomposite additives. This creates a fabric with superior strength-to-weight ratio, allowing the use of lighter gauge material that can withstand high inflation pressures without increasing stress beyond safe limits. The composite structure enables reduced fabric weight while maintaining structural integrity under increased pressure conditions.
Solution Approach 2:
The patent changes the physical and chemical parameters of the fabric material by using ultra-high-tenacity fibers with specific denier ratings and advanced coating formulations. These parameter changes include fiber strength, coating thickness, and material composition, which collectively enable the fabric to withstand higher stresses from increased inflation pressure while maintaining lighter weight.
2Strength
If heavier gauge slide fabric is used to withstand increased inflation pressure, then the fabric strength is improved, but the overall weight of the evacuation slide increases
Solution Approach 1:
The patent uses composite materials consisting of ultra-high-tenacity nylon fibers combined with advanced polyurethane coatings and nanocomposite reinforcements. This composite structure achieves superior strength properties without proportionally increasing weight, as the high-performance fibers and coatings provide enhanced strength-to-weight ratio compared to conventional single-material fabrics.
Solution Approach 2:
The patent applies local quality by using ultra-high-tenacity fibers specifically in critical load-bearing areas and applying varied coating thicknesses in different regions of the fabric. This targeted approach ensures maximum strength where needed while minimizing material usage and weight in less critical areas, optimizing the overall strength-to-weight ratio of the evacuation slide.
3Reliability
If multiple layers of coating are applied to the base cloth, then the air-impervious and heat-resistant properties are improved, but the areal weight of the fabric increases
Solution Approach 1:
The patent changes the parameters of the coating layers by using advanced polyurethane formulations with optimized thickness and composition. The coatings are applied at controlled thicknesses that provide sufficient air-impervious and heat-resistant properties while minimizing weight addition. The nanocomposite additives enhance protective properties at lower coating thicknesses, further reducing weight.
Solution Approach 2:
The patent uses composite material systems where multiple functional layers are combined: the base fabric provides structural strength, while thin layers of polyurethane coating provide air-impervious and heat-resistant properties. The nanocomposite additives within the coatings enhance protective functions at minimal thickness, achieving high reliability with minimal weight penalty.
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 achieves a 25% weight savings while maintaining or exceeding the strength of previous slide fabrics, providing a more efficient and safer evacuation solution with reduced material usage.
Implementation Method 1
a polyurethane resin containing graphene nanoplatelets and a phosphorus-based flame retardant, which improves tensile and gas barrier properties
Implementation Method 2
graphene nanoplatelets
Implementation Method 3
a phosphorus-based flame retardant
Implementation Method 4
resistance to radiant heat, flammability
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A high- strength, lightweight inflatable structure (10) is formed of at least one flexible fabric member (24, 26) that, in an inflated condition, forms a self-supporting structure. The flexible fabric member (24, 26) is formed from a bare fabric (62) having an areal weight of less than 4.5 oz/yd2. The fabric is coated with air-impervious resin coating (64) comprising a polyurethane resin having a mixture of graphene nanoplatelets and a phosphorus-based flame retardant added thereto. The thermally exfoliated graphene nanoplatelets contain residual graphene oxide. Graphene oxide, which is a polar molecule, has an affinity for the polar molecules that make up the phosphorus based flame retardant. Accordingly, in addition to its inherent flame -retardant properties, the phosphorus based flame retardant acts as a dispersant to improve the uniform dispersion of the graphene nanoplatelets within the matrix, thus reducing or eliminating the need to use additional dispersants.