Composite Panel Noncombustible Polymer Core
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Solution Overview
Problem
Current composite panels used in building cladding and siding, despite having flame retardant properties, face challenges in meeting stringent noncombustibility standards due to the deterioration of mechanical properties when high amounts of flame retardant additives are used, leading to manufacturing difficulties and concerns about their ability to pass tests for noncombustibility, especially in tall buildings.
Innovation Solution
A composite panel structure featuring a polymer matrix sandwiched between metal layers, comprising 1-30 wt % fluoropolymer and 70-99 wt % flame retardant mineral, which satisfies noncombustibility standards by using a combination of polyvinylidene fluoride and aluminum hydroxide, ensuring compliance with ASTM E136 and CAN/ULC S114 standards through optimized composition and manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of flame retardant additives are used to improve flame retardancy, then flame resistance is improved, but mechanical properties deteriorate and manufacturing becomes difficult
Solution Approach 1:
The invention changes the chemical composition parameters by using fluoropolymer (with inherently high flame resistance due to carbon-fluorine bonds) as the base polymer instead of conventional thermoplastics, allowing achievement of noncombustibility with lower flame retardant additive content (5-50 wt%) compared to conventional compositions requiring 75-90 wt% additives
Solution Approach 2:
The invention creates a composite material system combining fluoropolymer with flame retardant minerals (aluminum hydroxide, magnesium hydroxide, or vermiculite) in optimized proportions, where the fluoropolymer matrix provides structural integrity and the mineral additives provide flame retardancy, achieving both mechanical strength and fire resistance
2Reliability
If high amounts of flame retardant additives are used to meet noncombustibility standards, then flame resistance is improved, but manufacturing precision deteriorates
Solution Approach 1:
The invention changes the polymer base from conventional thermoplastics to fluoropolymer, which has inherent flame-resistant properties, thereby reducing the required concentration of flame retardant additives from 75-90 wt% to 5-50 wt%, which significantly improves manufacturability while still achieving noncombustibility
Solution Approach 2:
The invention uses conventional, well-established manufacturing processes (extrusion, calendering) that are already widely available in the industry, avoiding the need for specialized or complex manufacturing equipment, thereby maintaining ease of manufacture despite the specialized polymer composition
3Ease of manufacture
If MCM panels are used for building cladding, then ease of manufacture is improved, but fire safety deteriorates due to inability to meet noncombustibility standards
Solution Approach 1:
The invention changes the chemical composition by using fluoropolymer as the base material, which has inherently high flame resistance due to the strength of carbon-fluorine bonds, enabling the panel to achieve noncombustibility classification while maintaining the sandwich structure and conventional manufacturing processes
Solution Approach 2:
The invention creates a composite polymer matrix combining fluoropolymer with flame retardant minerals (aluminum hydroxide, magnesium hydroxide, or vermiculite) in optimized proportions (5-50 wt% fluoropolymer, 50-95 wt% mineral), where the synergistic combination achieves noncombustibility (meeting ASTM E136 and CAN/ULC S114 standards) while maintaining structural integrity and manufacturability
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 proposed composite panel structure achieves noncombustibility while maintaining favorable mechanical properties, allowing for easy fabrication and meeting stringent fire resistance standards, thus addressing the limitations of existing materials.
Implementation Method 1
The polymer matrix comprises 1-30 wt % of a fluoropolymer and 70-99 wt % of a flame retardant mineral... achieves noncombustibility while maintaining favorable mechanical properties... meeting stringent fire resistance standards
Implementation Method 2
Important characteristics for the flame retardant intermediate layer are high flame resistance, heat insulation, and favorable mechanical properties for manufacturing
Data Source
AI summary
A composite panel structure of a polymer matrix core sandwiched by metal layers is described. The polymer matrix comprises 1-30 wt % fluoropolymer and 70-99 wt % of a flame retardant mineral. The fluoropolymer may be polyvinylidene fluoride (PVDF) with a high limiting oxygen index, which confers fire resistance properties to the polymer matrix and the composite panel structure. The composite panel structure may be used on the exterior of buildings and may fulfill building code requirements for the polymer matrix core being noncombustible as determined by ASTM E136 and CAN/ULC S114 compliance.