PVA Resin Composition Using Acid Radicals for Stable Melt Molding
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Solution Overview
Problem
Polyvinyl alcohol (PVA)-based resins face challenges in maintaining gas barrier properties, thermal stability, and molding stability due to crystallinity disruption and viscosity changes during melt molding, especially when plasticizers or other monomers are introduced.
Innovation Solution
A resin composition containing specific amounts of formic acid radicals 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 composition for melt molding, then molding processability is improved, but gas barrier properties deteriorate due to crystallinity disturbance
Solution Approach 1:
The patent introduces formic acid radicals and acetic acid radicals as chemical modifications to the PVA resin structure. These radicals change the chemical parameters of the resin, enabling melt molding without requiring plasticizers that would compromise gas barrier properties. The formic acid radicals (4-500 ppm) and acetic acid radicals (10000-100000 ppm) modify the resin's thermal and rheological properties to facilitate processing while preserving crystallinity.
Solution Approach 2:
The patent creates a composite resin composition by incorporating formic acid radicals and acetic acid radicals into the PVA-based resin matrix. This composite structure combines the gas barrier properties of crystalline PVA with the melt-processability enabled by the acid radicals, achieving both improved molding processability and maintained gas barrier performance.
2Productivity
If melt molding of PVA-based resin is performed continuously for a long period, then productivity is improved, but molding stability deteriorates due to viscosity change and thickening
Solution Approach 1:
The formic acid radicals and acetic acid radicals modify the resin's rheological parameters, stabilizing viscosity during continuous melt molding. The acid radicals act as internal stabilizers that prevent excessive thickening over time, enabling long-duration continuous processing without loss of molding stability.
3Ease of manufacture
If melt molding of PVA-based resin is performed at high temperature, then molding processability is improved, but thermal stability deteriorates due to heat degradation
Solution Approach 1:
The introduction of formic acid radicals and acetic acid radicals changes the thermal parameters of the PVA resin. These radicals raise the effective processing temperature range and reduce heat degradation, allowing melt molding at higher temperatures without compromising thermal stability or causing deterioration.
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 during melt molding, maintaining excellent gas barrier properties.
Implementation Method 1
improves thermal stability and molding stability by suppressing oxidative degradation
Data Source
AI summary
A resin composition contains a PVA-based resin, formic acid radicals, and an acetic acid radical. A content of the formic acid radicals in the resin composition is from 4 to 500 ppm. A content ratio of the formic acid radicals to the acetic acid radicals (formic acid radicals/acetic acid radicals) is from 0.001 to 0.200.