Recycled Polyester Thermoplastic Composition for Stronger Metal Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polybutylene terephthalate (PBT) thermoplastic polymer experiences reduced bonding strength after molding, necessitating the use of promoter additives that can adversely affect other properties, and there is a growing need for sustainable solutions due to environmental standards.
Innovation Solution
A thermoplastic composition comprising 10-80 wt% chemically recycled polyester, 10-60 wt% reinforcing filler, and 5-20 wt% polycarbonate, which enhances metal bonding strength compared to compositions using virgin polyester.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If promoter additives are added to PBT composition to improve metal bonding strength, then metal bonding strength is improved, but other properties are adversely affected
Solution Approach 1:
The invention changes the chemical composition parameters by replacing virgin PBT with chemically recycled polyester and adding specific amounts of polycarbonate (5-20 wt%) and reinforcing fillers (10-60 wt%). This parameter change achieves improved metal bonding strength (up to 30% enhancement) without relying on promoter additives that would compromise other material properties.
2Ease of manufacture
If virgin polyester is used in thermoplastic composition, then consistent processing is achieved, but environmental sustainability is poor
Solution Approach 1:
The invention recovers and reuses polyester through chemical recycling processes, converting waste polyester materials back into usable thermoplastic composition. This approach achieves environmental sustainability by reducing waste while maintaining processing consistency through controlled chemical recycling methods that produce uniform material properties.
Solution Approach 2:
The invention creates a composite material system combining chemically recycled polyester with polycarbonate components and reinforcing fillers. This composite approach compensates for any variability in the recycled polyester base material, ensuring consistent processing performance while achieving environmental sustainability goals.
3Object-affected harmful factors
If chemically recycled polyester is used instead of virgin polyester, then environmental sustainability is improved, but metal bonding strength may be reduced
Solution Approach 1:
The invention formulates a composite thermoplastic composition where chemically recycled polyester (10-80 wt%) is combined with polycarbonate (5-20 wt%) and reinforcing fillers (10-60 wt%). This composite structure compensates for any potential weaknesses in the recycled polyester and achieves superior metal bonding strength (up to 30% improvement over virgin polyester compositions) while maintaining environmental sustainability.
Solution Approach 2:
The invention enhances specific local properties of the chemically recycled polyester by incorporating reinforcing fillers and polycarbonate components. This local quality enhancement targets the metal bonding interface specifically, allowing the bulk material to remain environmentally friendly while the bonding regions achieve superior strength characteristics.
Data Source
AI summary
Thermoplastic compositions include: from about 10 wt % to about 80 wt % of a chemically recycled polyester component; from about 10 wt % to about 60 wt % of a reinforcing filler; and from about 5 wt % to about 20 wt % of a polycarbonate component. The thermoplastic composition has an improved metal bonding strength as compared to a comparative composition that includes a virgin polyester component instead of the chemically recycled polyester component. Methods for forming thermoplastic compositions are also described.