PVA Resin Composition for Stable Melt Molding and Gas Barrier Retention
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Solution Overview
Problem
PVA-based resins face issues with reduced gas barrier properties and poor thermal and molding stability due to crystallinity disruption from plasticizers or monomer copolymerization, leading to viscosity changes and thermal degradation during long-term melt molding.
Innovation Solution
A resin composition containing specific amounts of formic acid and acetic acid radicals, along with a PVA-based resin, improves thermal and molding stability by suppressing oxidative degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plasticizer is added to a PVA-based resin to enable melt molding, then molding stability is improved, but gas barrier properties are reduced due to crystallinity disturbance
Solution Approach 1:
The invention changes the chemical composition parameters by introducing formic acid radicals and controlling acetic acid radical content in the PVA-based resin. This chemical modification allows the resin to achieve melt molding capability while preserving gas barrier properties, resolving the contradiction between ease of manufacture and reliability.
2Productivity
If a PVA-based resin is used for long-term continuous melt molding, then productivity is improved, but molding stability deteriorates due to great viscosity change and thickening
Solution Approach 1:
The invention modifies the resin composition parameters by incorporating formic acid radicals and limiting acetic acid radical content, which fundamentally changes the resin's thermal and rheological properties. This enables long-term continuous melt molding with stable viscosity and consistent molding quality, resolving the contradiction between productivity and composition stability.
3Productivity
If a PVA-based resin is subjected to prolonged heat exposure during melt molding, then processing time is reduced, but thermal stability deteriorates due to heat degradation
Solution Approach 1:
The invention changes the chemical structure parameters by introducing formic acid radicals and controlling acetic acid radical content, which enhances the resin's thermal stability. This allows prolonged heat exposure during melt molding without degradation, enabling efficient processing while maintaining product quality, thus resolving the contradiction between productivity and thermal stability.
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 resin composition achieves enhanced thermal stability and molding stability, maintaining gas barrier properties and facilitating stable melt molding processes.
Implementation Method 1
a resin composition containing a polyvinyl alcohol-based resin, formic acid radicals, and acetic acid radicals... improved thermal stability... suppressing oxidative degradation
Implementation Method 2
polyvinyl alcohol (PVA) has high crystallinity due to hydrogen bonding of hydroxy groups and excellent gas barrier properties based on the high crystallinity
Data Source
AI summary
The present invention pertains to a resin composition containing a PVA-based resin, formic acid root, and acetic acid root, wherein the content of the formic acid root in the resin composition is 4-500 ppm, and the content ratio of the formic acid root to the acetic acid root (formic acid root/acetic acid root) is 0.001-0.200.