Bio-based PTT Polycarbonate Polymer Composition for Fire Retardant Injection Molding
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Solution Overview
Problem
Current materials for slim, high-definition imaging devices and portable wireless terminals face challenges in maintaining stiffness, moldability, and eco-friendliness, with recycled materials experiencing supply instability and property degradation, and biomaterials undergoing crystallization issues in injection-molded products.
Innovation Solution
A polymer composition combining bio-based polytrimethylene terephthalate (bio-PTT) with a thermoplastic resin containing polycarbonate and a core-shell type elastomer, along with glass fibers, to create a fire-retardant and impact-resistant material suitable for injection-molding, ensuring eco-friendliness and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If recycled materials (PCM or PCR) are used to achieve eco-friendliness, then environmental sustainability is improved, but supply stability and impact strength properties deteriorate
Solution Approach 1:
The patent uses a composite material system combining PTT (polytrimethylene terephthalate) as the base resin with PC (polycarbonate) as a modifier. This composite approach allows achieving both eco-friendliness through bio-based PTT and improved mechanical properties including impact strength and supply stability through the PC component, resolving the contradiction between environmental sustainability and material reliability
Solution Approach 2:
The patent specifies precise compositional parameters: PTT content of 85-99.99 wt%, PC content of 0.01-15 wt%, and controlled melt flow rate (1-50 g/10min at 280°C). By controlling these parameters, the invention achieves optimal balance between eco-friendliness, supply stability, and mechanical properties including impact strength
2Object-affected harmful factors
If biomaterials are used to achieve eco-friendliness, then environmental sustainability is improved, but crystallization causes property changes in injection-molded products
Solution Approach 1:
The patent introduces PC (polycarbonate) as an intermediary material that modifies the crystallization behavior of bio-based PTT. The PC component acts as a mediator that suppresses excessive crystallization during injection molding, thereby maintaining property stability while preserving the eco-friendly characteristics of the bio-based resin
Solution Approach 2:
The patent controls the PC content within 0.01-15 wt% and adjusts the melt flow rate to 1-50 g/10min at 280°C. These parameter controls optimize the balance between suppressing crystallization-induced property changes and maintaining the eco-friendly nature of the bio-based PTT material
3Strength
If material composition is optimized for stiffness and flowability, then mechanical properties are improved, but fire retardancy and impact strength may deteriorate
Solution Approach 1:
The patent employs a composite material system where PTT provides base mechanical properties, PC enhances stiffness and fire retardancy, and impact modifiers (such as core-shell elastomers) improve impact strength. This multi-component composite approach allows simultaneous optimization of stiffness, flowability, fire retardancy, and impact resistance without compromising any single property
Solution Approach 2:
The patent incorporates impact modifiers and flame retardant additives at specific locations and concentrations within the material composition. The impact modifiers are added in controlled amounts (0.1-10 wt%) to provide localized impact strength enhancement without affecting the overall stiffness and flowability of the PTT-PC matrix
Data Source
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AI summary
An eco-friendly fire-retardant polymer composition, a molded article made from the composition, and a method of manufacturing the molded article. The composition includes: a thermoplastic resin containing polycarbonate; a bio-based resin containing polytrimethylene terephthalate extracted from a biomaterial; and an impact modifier containing a core-shell type elastomer.