Polyester Resin Gas Barrier Enhancement via Composite Additives
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Solution Overview
Problem
Conventional polyester resin production methods for beverage containers face challenges in achieving adequate gas barrier resistance, leading to issues like carbon dioxide escape from carbonated beverages and oxygen ingress, which complicates the manufacturing process and increases costs due to the need for multi-layer containers.
Innovation Solution
A method involving direct melt-phase esterification/polycondensation of polyester resins without solid-state polymerization, combined with the use of additives like organo-clay and co-polyamide co-barrier resins, to enhance gas barrier properties and mechanical characteristics, resulting in a single-layer container with improved resistance to gas permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional melt-phase esterification/polycondensation is used to produce polyester resins, then the manufacturing process is simple and cost-effective, but the gas barrier resistance is inadequate leading to carbon dioxide escape and oxygen ingress
Solution Approach 1:
The patent applies composite materials by combining polyester resin with nucleating agents and colorants to create a multi-component composition that achieves both adequate gas barrier resistance and manufacturability. The composite formulation includes specific ratios of polyester resin (90-99 wt%), nucleating agents (0.1-5 wt%), and colorants (0.1-5 wt%), creating a material that maintains the simplicity of melt-phase processing while improving functional performance through material composition rather than process complexity
2Reliability
If multi-layer containers are used to improve gas barrier properties, then gas barrier resistance is enhanced, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent applies local quality by incorporating nucleating agents and colorants at specific local concentrations within the polyester resin matrix. The nucleating agents are distributed at 0.1-5 wt% to create localized crystallization nuclei that enhance gas barrier properties, while colorants are added at 0.1-5 wt% for specific functional requirements. This localized enhancement of material properties allows single-layer containers to achieve gas barrier performance previously requiring multi-layer structures
3Strength
If solid-state polymerization is employed to increase intrinsic viscosity, then mechanical properties improve, but the process time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by incorporating nucleating agents during the initial melt-phase esterification and polycondensation steps, before the resin is formed. This preliminary incorporation of nucleating agents (0.1-5 wt%) ensures that crystallization enhancement is built into the material structure during resin production, eliminating the need for subsequent solid-state polymerization steps to achieve the desired mechanical properties and intrinsic viscosity
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 approach significantly improves gas barrier resistance by up to 100% for carbon dioxide and oxygen, allowing for the production of single-layer containers that maintain beverage quality and reduce manufacturing complexity and costs.
Implementation Method 1
improved resistance to gas permeation
Data Source
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AI summary
A process for producing compositions having improved gas barrier properties, and compositions containing a polyester resin and one or more of another thermoplastic resin and a filler, and may be used to form containers that exhibit improved resistance to gas permeation.