Acid-Modified Polyester Resin Laminate Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing laminates with polylactic acid and polyvinyl alcohol resin layers face challenges in achieving high transparency and practical interlayer adhesiveness due to poor surface properties, and existing adhesive layers often result in appearance defects and insufficient adhesion strength.
Innovation Solution
A biodegradable acid-modified polyester resin with an acid value between 2.0 mg·KOH/g and 6.5 mg·KOH/g, formed by graft polymerization of α,β-unsaturated carboxylic acid or anhydride, is used as an adhesive layer, ensuring high transparency and adhesiveness between the PVA resin and biodegradable resin layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a laminate is formed by directly laminating polylactic acid resin layer and polyvinyl alcohol resin layer, then the structure is simple, but the interlayer adhesion strength is insufficient due to poor surface properties
Solution Approach 1:
An adhesive layer comprising acid-modified polyester resin is introduced between the polylactic acid resin layer and polyvinyl alcohol resin layer. This intermediary layer improves interlayer adhesion strength by chemically or physically bonding to both adjacent layers, resolving the adhesion problem without requiring complex surface treatments or changing the basic laminate structure.
2Strength
If an adhesive layer is added between polylactic acid resin layer and polyvinyl alcohol resin layer, then the interlayer adhesion strength is improved, but the laminate structure becomes more complex
Solution Approach 1:
The adhesive layer uses acid-modified polyester resin with specific parameters: acid value of 15-40 mg KOH/g, and specific compositional ratios (aliphatic dicarboxylic acid 30-70 mol%, aromatic dicarboxylic acid 10-40 mol%, diol 10-30 mol%). By optimizing these parameters, the adhesive layer achieves sufficient adhesion strength while keeping the layer thin, thus minimizing the increase in overall laminate complexity.
3Strength
If existing adhesive layers are used, then interlayer adhesion is improved, but appearance defects occur and transparency is reduced
Solution Approach 1:
The adhesive layer uses acid-modified polyester resin with controlled acid value (15-40 mg KOH/g) and specific compositional parameters that balance adhesion and transparency. The resin formulation and processing conditions are optimized to achieve uniform, thin adhesive layers without rough interfaces or appearance defects, maintaining high transparency while providing sufficient adhesion strength.
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 biodegradable acid-modified polyester resin achieves a laminate with high transparency and excellent adhesiveness, preventing appearance defects and ensuring sufficient interlayer adhesion strength, while maintaining biodegradability.
Implementation Method 1
a biodegradable acid-modified polyester resin formed by graft polymerization of an α,β-unsaturated carboxylic acid or an anhydride thereof to a biodegradable polyester resin
Data Source
AI summary
An object of the present invention is to provide a biodegradable acid-modified polyester resin, from which a laminate including a polyvinyl alcohol resin layer and a biodegradable resin layer, having little roughness at an adhesive layer interface between the two layers, and excellent in both appearance and adhesiveness can be obtained. The present invention relates to a biodegradable acid-modified polyester resin having an acid value of 2.0 mg·KOH/g to 6.5 mg·KOH/g.