Biodegradable Polyester Resin Composition for Transparent PVA Blends
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Solution Overview
Problem
The compatibility between biodegradable polyester and polyvinyl alcohol resin is low, leading to poor dispersion and impaired transparency in molded products.
Innovation Solution
A resin composition comprising a polyester resin derived from an aliphatic diol, polyvinyl alcohol resin, and an ester group-containing acid-modified resin, with specific acid value relationships to enhance compatibility and dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyvinyl alcohol resin is mixed with biodegradable polyester by melt extrusion or kneading, then the polyvinyl alcohol resin can be dispersed in the matrix, but the compatibility is low resulting in poor dispersion and impaired transparency
Solution Approach 1:
The patent introduces a specific ester group-containing acid-modified resin as an intermediary substance that facilitates compatibility between polyvinyl alcohol resin and biodegradable polyester. This intermediary resin has specific acid value characteristics (2.0-10.0 mg KOH/g) that enable it to act as a compatibilizer, improving dispersion quality while maintaining transparency through appropriate interfacial interactions.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the acid value of the ester group-containing acid-modified resin within a specific range (2.0-10.0 mg KOH/g) and adjusting the blending ratios of all components. This parameter optimization enhances compatibility and dispersion while preserving optical properties, directly resolving the transparency issue.
2Adaptability or versatility
If polyvinyl alcohol resin is dispersed in biodegradable polyester matrix, then gas barrier properties are improved, but compatibility issues result in coarse dispersion and reduced transparency
Solution Approach 1:
The ester group-containing acid-modified resin serves as a compatibilizer that enables uniform dispersion of polyvinyl alcohol resin throughout the biodegradable polyester matrix. Its specific acid value (2.0-10.0 mg KOH/g) allows it to mediate between the incompatible polymers, achieving both gas barrier improvement and dispersion uniformity simultaneously.
Solution Approach 2:
The patent creates a composite resin composition system comprising three components: biodegradable polyester, polyvinyl alcohol resin, and ester group-containing acid-modified resin. This composite approach leverages the complementary properties of each component to achieve both gas barrier enhancement and uniform dispersion, overcoming the limitations of binary mixtures.
Data Source
AI summary
The present invention provides a resin composition which contains a biodegradable polyester and a polyvinyl alcohol resin, and which exhibits excellent transparency. A resin composition according to the present invention contains (A) a polyester resin which contains at least one constituent unit derived from an aliphatic diol (provided that an ester group-containing acid-modified resin is excluded), (B) a polyvinyl alcohol resin, and (C) an ester group-containing acid modified resin.