Polycarbonate Resin Composition Flame Retardancy Mechanical Properties
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Solution Overview
Problem
Polycarbonate resin compositions containing post-consumer recycled materials face challenges in achieving high flame retardancy, impact resistance, and heat resistance, which limits their application in industries like electronics and automotive due to inferior mechanical properties compared to conventional plastics.
Innovation Solution
A polycarbonate resin composition is developed, comprising 8-25% non-recycled polycarbonate, 45-77% post-consumer recycled polycarbonate, 8-25% polysiloxane-polycarbonate copolymer, 4.5-9% room-temperature liquid phosphorus-based flame retardant, and 1.5-5.5% phosphazene compound, optimized to enhance flame retardancy, impact resistance, and heat resistance while maintaining a high recycled content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flame retardant is added to polycarbonate to improve flame retardancy, then flame retardancy is improved, but mechanical properties such as impact resistance and heat resistance are deteriorated
Solution Approach 1:
The patent changes the chemical structure parameters of the flame retardant by using phosphazene compounds with specific cyclic structures (6-membered or 5-membered rings) and particular substituent groups. This structural parameter change allows the flame retardant to provide effective flame protection while maintaining compatibility with polycarbonate's mechanical properties, resolving the contradiction between flame retardancy and mechanical strength
Solution Approach 2:
The patent creates a composite system by combining phosphazene flame retardants with polycarbonate in specific formulations. This composite approach allows the flame retardant to function effectively while the polycarbonate matrix maintains its mechanical integrity, achieving both flame retardancy and preserved mechanical properties through material composition
2Ease of repair
If post-consumer recycled polycarbonate is included in thermoplastic resin composition to improve recyclability, then recyclability is improved, but impact resistance and heat resistance are further deteriorated
Solution Approach 1:
The patent applies parameter changes by carefully controlling the content ratio of recycled polycarbonate within specific ranges and adjusting molecular weight parameters. This allows maximizing the use of recycled material for sustainability while maintaining sufficient mechanical performance through optimized compositional parameters
Solution Approach 2:
The patent applies local quality by using different polycarbonate sources (virgin and recycled) in specific proportions and combinations. This localized differentiation in material quality within the composition allows the recycled portion to contribute to recyclability while the overall formulation maintains necessary mechanical properties
3Object-generated harmful factors
If high content of post-consumer recycled polycarbonate is used to improve environmental friendliness, then environmental friendliness is improved, but flame retardancy and mechanical properties are insufficient
Solution Approach 1:
The patent creates a composite formulation combining recycled polycarbonate with phosphazene flame retardants. This composite material approach enables high recycled content for environmental benefit while the phosphazene component provides the necessary flame protection that recycled materials alone cannot achieve
Data Source
AI summary
The present disclosure relates to a polycarbonate resin composition including 8 to 25% by weight of a polycarbonate (A) having a melt index (300° C., 1.2 kg) of 5 to 15 g/10 min; 45 to 77% by weight of a polycarbonate (B) having a melt index (300° C., 1.2 kg) of greater than 15 g/10 min and 25 g/10 min or less; 8 to 25% by weight of a polysiloxane-polycarbonate copolymer (C); 4.5 to 9% by weight of a room-temperature liquid phosphorus-based flame retardant (D); and 1.5 to 5.5% by weight of a phosphazene compound (E), a method of preparing the polycarbonate resin composition, and a molded article including the polycarbonate resin composition.