Multilayer Container Polyamide Layer Yellowing Inhibitor
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Solution Overview
Problem
The challenge is to create a multilayer container that effectively suppresses yellowing while maintaining high oxygen barrier properties, particularly when recycled, as existing polyester containers tend to yellow due to oxidation when materials that absorb oxygen are used.
Innovation Solution
A multilayer container comprising a polyester layer and a polyamide layer with a specific yellowing inhibitor and oxidation accelerator, where the polyamide layer contains a polyamide resin, a yellowing inhibitor, and an oxidation accelerator, enhancing oxygen absorption and preventing yellowing during recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide layer is added to improve oxygen barrier properties, then oxygen barrier performance is improved, but yellowing occurs due to thermal history during recycling
Solution Approach 1:
A yellowing inhibitor compound acts as an intermediary substance between the polyamide layer and the recycling process. This compound specifically prevents the harmful yellowing reaction that occurs when polyamide undergoes thermal history during recycling, while allowing the polyamide layer to maintain its oxygen barrier function. The yellowing inhibitor mediates the interaction between the polyamide resin and recycling conditions, eliminating the harmful effect without compromising the beneficial oxygen barrier property.
2Reliability
If materials that absorb oxygen are used to improve oxygen barrier, then oxygen barrier property is improved, but yellowing is exacerbated during recycling
Solution Approach 1:
The invention converts the harmful yellowing effect into a beneficial outcome by introducing a yellowing inhibitor compound. This compound transforms the harmful thermal history reaction into a controlled process where the yellowing is prevented while maintaining the oxygen absorption and barrier functions. The harmful yellowing tendency is converted into a stable, non-yellowing recycled material that retains its protective oxygen barrier properties.
3Reliability
If polyxylylene adipamide is used to improve gas barrier properties, then gas barrier performance is improved, but yellowing occurs during recycling process
Solution Approach 1:
The invention changes the chemical parameters of the polyamide layer by incorporating a yellowing inhibitor compound. This parameter change modifies the chemical composition to prevent yellowing during recycling while preserving the gas barrier properties. The addition of the yellowing inhibitor alters the chemical stability parameters of the polyamide, enabling it to withstand recycling conditions without yellowing while maintaining its oxygen and gas barrier functions.
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 solution achieves both excellent oxygen barrier properties and suppressed yellowing of recycled polyester, ensuring the container's longevity and performance.
Implementation Method 1
a polyamide layer containing a polyamide resin, a yellowing inhibitor and an oxidation accelerator
Implementation Method 2
a yellowing inhibitor (A), and the content of the yellowing inhibitor (A) is from 1 to 30 ppm relative to the total amount of all polyamide layers and all polyester layers
Data Source
AI summary
Provided is a multilayer container including a polyester layer containing a polyester resin (X), and a polyamide layer containing a polyamide resin (Y), a yellowing inhibitor (A), and an oxidation accelerator (B). The content of the polyamide resin (Y) is from 0.05 to 7.0 mass% relative to the total amount of all polyamide layers and all polyester layers. The yellowing inhibitor (A) is a dye, and the content of the yellowing inhibitor (A) is from 1 to 30 ppm relative to the total amount of all polyamide layers and all polyester layers.