Semi-Aromatic Polyamide Barrier Layer for Fire Suppressant Retention
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Solution Overview
Problem
Current fire extinguishing devices for vehicles and domestic appliances face challenges due to high permeability of thermoplastic materials to fire extinguishing agents, leading to reduced effectiveness and environmental concerns.
Innovation Solution
The use of a semi-aromatic polyamide as a barrier layer in fire extinguishing devices significantly reduces permeability, improving the long-term efficiency and reliability of the devices, while also enhancing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic materials (e.g., polyamide 12, EVOH) are used as barrier layers in fire extinguishing devices, then the device structure is simple and easy to manufacture, but the permeability to fire extinguishing agents is high, reducing long-term storage effectiveness
Solution Approach 1:
The patent applies composite materials by combining semi-aromatic polyamide with other materials to create a multilayer barrier structure. This composite approach leverages the low permeability of semi-aromatic polyamide to fire extinguishing agents while maintaining manufacturability, directly resolving the contradiction between ease of manufacture and storage effectiveness.
Solution Approach 2:
The patent changes the material parameter from conventional thermoplastic materials to semi-aromatic polyamide, which has fundamentally different permeability characteristics. This parameter change transforms the barrier layer's ability to retain fire extinguishing agents, improving long-term storage effectiveness without compromising manufacturing feasibility.
2Device complexity
If conventional thermoplastic materials are used in fire extinguishing devices, then the device complexity is low, but the permeability to extinguishing agents increases over time, negatively impacting effectiveness
Solution Approach 1:
The use of semi-aromatic polyamide as a barrier layer creates a composite structure that maintains relatively simple device architecture while significantly improving effectiveness. The composite material approach allows the barrier layer to provide superior agent retention without adding substantial complexity to the overall device design.
3Weight of moving object
If simple extinguishing hoses with thermoplastic materials are used, then the overall dimension and weight are reduced compared to storage containers, but the permeability to fire extinguishing agents is not satisfactory, limiting long-term storage capability
Solution Approach 1:
The patent changes the material parameter of the barrier layer to semi-aromatic polyamide, which fundamentally improves the long-term storage capability of fire extinguishing agents. This parameter change allows the hose to maintain its lightweight design while achieving satisfactory agent retention over extended periods.
Solution Approach 2:
The semi-aromatic polyamide barrier layer creates a composite hose structure that maintains low weight comparable to conventional thermoplastic hoses while dramatically improving long-term storage capability through the superior barrier properties of the semi-aromatic polyamide 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 semi-aromatic polyamide barrier layer effectively reduces the permeability of fire extinguishing agents, enhancing the storage and release of extinguishing fluids, thereby improving the efficiency and reliability of fire extinguishing devices and minimizing environmental impact.
Implementation Method 1
the permeability of these thermoplastic materials to fire extinguishing agents is not satisfactory and does not allow the fire extinguishing agent to be stored over the long term
Data Source
AI summary
A fire extinguishing device is for a motor vehicle. The fire extinguishing device includes an internal cavity containing a pressurized fire extinguishing fluid. The cavity is delimited by a wall, the wall having at least one barrier layer (b) containing a semi-aromatic polyamide composition (B).