Recycled PET Polyester Resin Composition for Stable Injection Molding
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Solution Overview
Problem
Current polyester resin compositions, particularly those using PBT, face challenges in achieving excellent mechanical properties, injection properties, and heat resistance while being eco-friendly, especially when using inexpensive materials and recycled PET from waste mineral water bottles, which also have poor moldability and dimensional stability.
Innovation Solution
A composition comprising 26.7 to 54% polybutylene terephthalate resin, 10 to 37.5% polyethylene terephthalate resin, and 10 to 43% glass fiber, with calcium oxide content in the glass fiber ranging from 35.6 to 60% or 13 to 24%, processed through flake processing and chip molding of waste mineral water bottles, to create a recycled resin with improved mechanical and injection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If PET is added to improve eco-friendliness by using waste mineral water bottles, then environmental sustainability is improved, but moldability and dimensional stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the resin blend by incorporating specific ratios of PBT (26.7-54 wt%), PET (10-37.5 wt%), and glass fiber (10-43 wt%). This parameter adjustment allows the use of recycled PET while maintaining dimensional stability through the balancing effect of PBT and glass fiber components.
Solution Approach 2:
The patent creates a composite material system combining PBT, PET, and glass fiber in specific proportions. The glass fiber component (10-43 wt%) provides structural reinforcement that compensates for the poor dimensional stability of recycled PET, while the PBT matrix ensures good moldability. This composite approach allows eco-friendly PET utilization without sacrificing manufacturing precision.
2Strength
If inorganic filler such as glass fiber is added in large amount to improve mechanical properties and heat resistance, then strength and heat resistance are improved, but mass increases due to high specific gravity
Solution Approach 1:
The patent optimizes the glass fiber content parameter to a specific range (10-43 wt%) rather than using excessive amounts. This parameter control ensures that mechanical properties and heat resistance are improved while minimizing the weight increase. The balanced composition with PBT and PET further optimizes the strength-to-weight ratio.
3Object-affected harmful factors
If recycled PET from waste mineral water bottles is used to promote eco-friendliness, then environmental sustainability is improved, but injection properties and mechanical properties deteriorate
Solution Approach 1:
The patent adjusts the composition parameters by limiting recycled PET content to 10-37.5 wt% and supplementing with virgin PBT (26.7-54 wt%) and glass fiber (10-43 wt%). This parameter optimization ensures that the recycled content provides eco-friendliness while the virgin PBT and glass fiber maintain injection properties and mechanical performance.
Solution Approach 2:
The patent creates a composite system where recycled PET is combined with virgin PBT and glass fiber. The virgin PBT component ensures good injection moldability, while the glass fiber provides mechanical reinforcement. This composite structure allows the recycled PET to contribute to environmental sustainability without compromising ease of manufacture.
Data Source
AI summary
Provided is a polyester resin composition and a molded article manufactured using the same. The polyester resin composition can provide mechanical properties, particularly injection properties, similar to those of inexpensive PBT materials and satisfy both eco-friendliness and heat resistance. Due to these advantages, the polyester resin composition can be applied to a motor insulator part used inside a refrigerator that requires excellent dimensional stability, heat resistance, and injection properties.