EVOH Copolymer Composition for Long-Run Degradation Resistance
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Solution Overview
Problem
EVOH resin compositions face degradation issues due to thermal and environmental factors, leading to reduced melt stability, odor emission, and cracking, which existing stabilizers and antioxidants cannot adequately address.
Innovation Solution
Incorporating a very small amount of an iron compound (0.01 to 20 ppm) in combination with an antioxidant (1 to 30,000 ppm) improves the degradation resistance of EVOH resin compositions, enhancing their long-run formability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If various heat stabilizers are added to the EVOH resin, then thermal degradation is suppressed, but the degradation resistance under prolonged exposure to oxygen and environmental factors remains insufficient
Solution Approach 1:
The patent combines multiple stabilizer components (heat stabilizer, antioxidant, and UV stabilizer) into a composite stabilization system. This composite approach addresses both thermal degradation during processing and long-term environmental degradation, resolving the contradiction between thermal stability and overall degradation resistance.
Solution Approach 2:
The patent merges multiple stabilization functions into a single composition system where heat stabilizers, antioxidants, and UV stabilizers work synergistically. This combining of multiple protective mechanisms provides comprehensive degradation resistance that neither single stabilizer type could achieve alone.
2Reliability
If a specific amount of antioxidant and conjugated polyene compound are used, then degradation by oxygen is suppressed, but odor emanation and cracking still occur under prolonged use
Solution Approach 1:
The patent employs a composite stabilization system combining antioxidants with UV stabilizers and heat stabilizers. This multi-component composite prevents oxidation-related cracking and odor emanation by providing comprehensive protection against multiple degradation pathways simultaneously.
Solution Approach 2:
The patent optimizes the concentration ranges of multiple stabilizer components to achieve synergistic effects. By carefully controlling the parameters of each stabilizer type and their combinations, the system prevents harmful degradation products while maintaining long-term reliability.
3Duration of action of stationary object
If hindered amine compound is blended with EVOH resin, then weatherability is improved, but degradation resistance under combined thermal and environmental exposure remains insufficient
Solution Approach 1:
The patent creates a composite stabilization system that integrates UV stabilizers (hindered amine compounds) with heat stabilizers and antioxidants. This composite formulation provides comprehensive degradation resistance under combined thermal and environmental exposure, surpassing the performance of single stabilizer types.
Solution Approach 2:
The stabilization composition is designed to provide multiple protective functions simultaneously: UV protection, thermal stability, and oxidation resistance. This multi-functional stabilization system addresses various degradation mechanisms that occur during prolonged outdoor use.
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 enhances the degradation resistance and formability of EVOH resin compositions, making them suitable for prolonged use in various packaging and multilayer pipe applications without significant degradation or cracking.
Implementation Method 1
the combinational use of a specific very small amount of the iron compound and the antioxidant improves the degradation resistance of the EVOH resin composition
Implementation Method 2
an antioxidant... is present in an amount of 1 to 30,000 ppm based on the weight of the EVOH resin composition
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.