Polycarbonate Composite Flame Retardancy via Additive Coupling
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Solution Overview
Problem
Polycarbonate-based compositions used as matrix materials in fibre composite materials face challenges in achieving good flame retardancy and mechanical properties due to inadequate fibre coupling, leading to brittleness and poor wear resistance, which affects their suitability for applications requiring UL 94 V-0 certification.
Innovation Solution
A fibre composite material comprising aromatic polycarbonate with talc, cyclic phosphazene, and a phosphorus compound, along with optional stabilizers, is developed to enhance fibre-matrix coupling and improve mechanical and flame retardancy properties, specifically designed for multilayer composite materials suitable for electronic device housings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polycarbonate compositions are used as matrix material in fibre composite materials, then the material can be processed relatively easily, but the fibre coupling is inadequate leading to brittleness and poor mechanical properties
Solution Approach 1:
The patent modifies the chemical composition parameters of the polycarbonate matrix by incorporating specific additives (cyclic phosphazenes with 7-15 wt%, phosphorus compounds with 2-10 wt%, and talc with 1-14 wt%) to enhance fibre-matrix coupling. These compositional changes improve interfacial adhesion between fibres and matrix, thereby enhancing mechanical properties and reducing brittleness while maintaining processability
Solution Approach 2:
The patent creates a composite matrix system by combining polycarbonate with multiple functional additives (cyclic phosphazenes, phosphorus compounds, and talc). This composite approach leverages the synergistic effects of different components: cyclic phosphazenes provide flame retardancy and improve fibre coupling, phosphorus compounds enhance adhesion, and talc improves mechanical properties, collectively resolving the contradiction between ease of manufacture and mechanical strength
2Ease of manufacture
If conventional polycarbonate compositions are used as matrix material, then production costs are lower, but flame retardancy is insufficient to meet UL 94 V-0 certification requirements
Solution Approach 1:
The patent adjusts the compositional parameters by incorporating cyclic phosphazenes (7-15 wt%) and phosphorus compounds (2-10 wt%), which are known flame retardant agents. These additives modify the fire resistance properties of the polycarbonate matrix, enabling the material to achieve UL 94 V-0 certification while maintaining cost-effectiveness through optimized dosage ranges
Solution Approach 2:
The patent uses cyclic phosphazenes and phosphorus compounds as intermediary substances that serve dual functions: they act as flame retardants to achieve UL 94 V-0 certification and simultaneously improve fibre-matrix coupling. These intermediaries bridge the gap between cost-effective polycarbonate processing and high flame retardancy requirements
3Ease of manufacture
If conventional polycarbonate compositions are used, then simple processing is possible, but wear resistance is poor leading to elevated dust formation
Solution Approach 1:
The patent modifies the matrix composition by adding talc (1-14 wt%) and phosphorus compounds (2-10 wt%), which enhance the wear resistance of the composite material. These additives reinforce the matrix structure and improve fibre-matrix coupling, reducing fibre pull-out and wear during use, thereby decreasing dust formation while maintaining processing simplicity
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 enhanced mechanical properties and flame retardancy, meeting the UL 94 V-0 requirement, making the material suitable for lightweight, cost-effective production of housing components with improved durability and safety.
Implementation Method 1
enhance fibre coupling
Implementation Method 2
flame retardancy, meeting the UL 94 V-0 requirement
Data Source
AI summary
Multilayer composite material comprising specific polycarbonate compositions as matrix material The present invention relates to a composite material comprising one or more fibre layers composed of a fibre material and an aromatic polycarbonate-based matrix material. The fibre layer(s) is/are embedded in the matrix material. The present invention further relates to a process for producing these fibre composite materials, to multilayer composite materials comprising several layers of fibre composite material, and to the use of the composite materials for production of components or housing components or housings, and to the components, housing components or housings themselves.