Fire-Retardant Thermoplastic Composite Panel
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Solution Overview
Problem
Current fire-retardant materials for aircraft propulsion system nacelles, such as thermoset composites, offer low fire resistivity and are heavy, costly, and complex, while metallic structures provide better fire resistivity but at the expense of weight and manufacturing complexity.
Innovation Solution
A method involving the formation of fire-retardant thermoplastic composite panels by mixing a thermoplastic polymer like PEEK with borax or red phosphorus as additives, alternating layers of the polymer composition with carbon-fiber fabric, and compression molding at controlled temperatures and pressures to create a lightweight, fire-resistant panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoset composites are used as fire-retardant materials, then fire resistivity is improved, but weight increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the material parameters by using thermoplastic polymers instead of thermoset composites, and by adjusting the composition ratio of fire-retardant additives (borax and red phosphorus) to achieve both fire resistivity and reduced weight. The specific parameter change involves using 5-15% borax and 5-15% red phosphorus by weight in the polymer matrix.
Solution Approach 2:
The patent creates a composite material system combining thermoplastic polymer matrix with dual fire-retardant additives (borax and red phosphorus). This composite approach allows the material to achieve fire resistivity through the synergistic effect of both additives while maintaining the lightweight and manufacturability advantages of thermoplastics.
2Reliability
If thermoset composites are used as fire-retardant materials, then fire resistivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies manufacturing by changing from thermoset to thermoplastic processing, which allows for easier molding, joining, and fabrication. The parameter change in polymer type enables standard thermoplastic processing techniques to be used, reducing the specialized manufacturing complexity associated with thermoset composites.
Solution Approach 2:
The patent extracts the fire-retardant functionality from complex thermoset composite systems and integrates it into simpler thermoplastic matrices through the addition of specific chemical compounds (borax and red phosphorus), thereby separating the fire protection function from the structural material complexity.
3Reliability
If metallic structures are used, then fire resistivity is improved, but weight increases
Solution Approach 1:
The patent uses a composite material approach combining lightweight thermoplastic polymer with fire-retardant additives to achieve fire resistivity comparable to metallic structures while maintaining the weight advantages of polymer-based materials. The composite structure provides both structural integrity and fire protection.
Solution Approach 2:
The patent changes the material category from metallic to polymer-based by adjusting the chemical composition parameters of the polymer matrix and fire-retardant additive ratios, thereby achieving fire resistivity without the inherent weight penalty of metals.
4Reliability
If conventional fire-retardant materials are used, then fire resistivity is achieved, but cost increases
Solution Approach 1:
The patent reduces cost by optimizing the concentration parameters of fire-retardant additives within the range of 5-15% by weight, avoiding the need for expensive high-concentration or specialized fire-retardant materials while still achieving the required fire resistivity performance.
Solution Approach 2:
The patent uses cost-effective thermoplastic polymers and common fire-retardant chemicals (borax and red phosphorus) instead of expensive specialized fire-retardant materials, achieving fire protection through readily available materials that can be easily processed and manufactured.
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 improved fire retardance, structural strength, and reduced weight for aerospace structures, while also simplifying manufacturing processes compared to conventional thermosetting composites.
Implementation Method 1
mixing a thermoplastic polymer with a fire-retardant additive to form a fire-retardant polymer composition
Implementation Method 2
compression molding the composite layup to form the fire-retardant thermoplastic composite panel
Implementation Method 3
compression molding the composite layup to form the fire-retardant thermoplastic composite panel
Implementation Method 4
each second layer including a carbon-fiber fabric
Data Source
AI summary
A method for forming a fire-retardant thermoplastic composite panel includes mixing a thermoplastic polymer with a fire-retardant additive to form a fire-retardant polymer composition and assembling a composite layup of a plurality of first layers and a plurality of second layers by alternatingly positioning the plurality of first layers and the plurality of second layers with each first layer including a fire-retardant polymer composition film of the fire-retardant polymer composition and each second layer including a carbon-fiber fabric. The method further includes compression molding the composite layup to form the fire-retardant thermoplastic composite panel.