EVOH Copolymer Composition With Trace Iron for Degradation Resistance
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Solution Overview
Problem
EVOH resin compositions face degradation issues due to oxygen exposure, leading to thermal instability, coloration, and gelation, which existing stabilizers and antioxidants cannot sufficiently address for long-term use in packaging and multilayer pipes.
Innovation Solution
A specific combination of a very small amount of an iron compound (0.01 to 20 ppm) and an antioxidant is used in the EVOH resin composition, enhancing degradation resistance and long-run formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If various heat stabilizers are added to the EVOH resin to prevent thermal degradation during meltforming, then thermal stability during processing is improved, but the resin composition becomes more complex and may affect product purity
Solution Approach 1:
The patent extracts and identifies a specific harmful factor (iron compound) in trace amounts that catalyzes degradation, rather than adding multiple stabilizers. By targeting and addressing this specific extracted factor, the solution simplifies the overall composition while maintaining stability.
Solution Approach 2:
The patent changes the parameter of iron compound concentration to an extremely low level (0.01-20 ppm), transforming it from a harmful contaminant into a controlled component that works synergistically with antioxidants. This parameter change resolves the contradiction by maintaining stability without requiring complex multi-stabilizer formulations.
2Reliability
If a specific amount of antioxidant and conjugated polyene compound are used to suppress degradation in multilayer pipes exposed to higher temperatures, then degradation resistance is improved, but the composition complexity increases
Solution Approach 1:
The patent merges the functions of antioxidants and iron compounds into a synergistic system where the iron compound enhances the antioxidant's effectiveness. This combination achieves superior degradation resistance while simplifying the additive system compared to using multiple separate stabilizers.
Solution Approach 2:
The patent creates a composite stabilizing system combining antioxidant and iron compound at specific ratios, where the interaction between these components produces enhanced degradation resistance that exceeds the sum of individual effects, thereby improving reliability without proportional increases in complexity.
3Duration of action of stationary object
If hindered amine compound is blended with EVOH resin to suppress degradation in agricultural materials exposed to outdoor conditions, then weatherability is improved, but the resin composition becomes more complex
Solution Approach 1:
The patent applies parameter changes by controlling iron compound concentration at trace levels (0.01-20 ppm) in conjunction with antioxidants, creating an efficient stabilizing system that extends service life without requiring complex compositions of multiple high-concentration additives.
Solution Approach 2:
The iron compound acts as an intermediary that enhances the effectiveness of antioxidants, allowing the system to achieve superior long-term stability in outdoor conditions with a simpler composition than using high concentrations of multiple stabilizers.
4Reliability
If conventional stabilizers and antioxidants are used to prevent degradation, then some protection is achieved, but sufficient degradation resistance cannot be obtained for long-term use
Solution Approach 1:
The patent merges antioxidants with trace amounts of iron compound to create a synergistic system that provides sufficient degradation resistance for long-term use. This combination overcomes the limitation of conventional single or dual stabilizer systems.
Solution Approach 2:
The patent develops a composite stabilizing formulation where antioxidant and iron compound work together at specific ratios, producing enhanced degradation resistance that ensures long-term performance durability in demanding applications.
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 combination significantly improves the degradation resistance of EVOH resin compositions, ensuring higher quality and longer-lasting performance in packaging materials and multilayer pipes, particularly in hot water circulation systems and agricultural applications.
Implementation Method 1
the formed product is liable to suffer from odor emanation and cracking due to degradation of the resin... liable to be degraded by oxygen present in air when being exposed to a higher temperature for a prolonged period
Implementation Method 2
a specific combination of a very small amount of an iron compound (0.01 to 20 ppm) and an antioxidant is used in the EVOH resin composition, enhancing degradation resistance
Data Source
AI summary
An ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer; (B) an antioxidant; and (C) an iron compound; wherein the iron compound (C) is present in an amount of 0.01 to 20 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition is excellent in degradation resistance.