Biodegradable Polyester–Polyvinyl Alcohol Adhesive for Laminate Bonding
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Solution Overview
Problem
Conventional biodegradable laminates exhibit insufficient adhesive strength between polyvinyl alcohol resin and biodegradable resin layers.
Innovation Solution
An adhesive resin composition comprising a biodegradable polyester resin and polyvinyl alcohol resin, with a specific parameter (Y/X) ranging from 0.30 to 0.99, where X is the mass of polyvinyl alcohol resin in a film and Y is the mass extracted in hot water, forming a co-continuous structure that enhances adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions are used in biodegradable laminates, then the laminate structure can be formed, but the adhesive strength between polyvinyl alcohol resin layer and biodegradable resin layer is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating both polyvinyl alcohol resin and biodegradable polyester resin in specific proportions. This parameter change enables the adhesive layer to simultaneously achieve strong bonding to both polyvinyl alcohol resin layers and biodegradable resin layers, resolving the insufficient adhesive strength problem while maintaining biodegradability.
Solution Approach 2:
The patent creates a composite adhesive material combining polyvinyl alcohol resin and biodegradable polyester resin. This composite approach allows the adhesive layer to exhibit dual compatibility - bonding effectively to both polar polyvinyl alcohol surfaces and non-polar biodegradable resin surfaces - thereby achieving reliable bonding strength that conventional single-material adhesives cannot provide.
2Object-affected harmful factors
If biodegradable resins are used to prevent environmental pollution, then environmental friendliness is improved, but adhesive strength in laminate structures deteriorates
Solution Approach 1:
The biodegradable polyester resin in the adhesive layer serves multiple functions: it provides bonding capability to biodegradable resin layers, maintains adhesive performance in moisture environments, and ensures overall laminate integrity. This multi-functionality allows the adhesive to achieve reliable strength while maintaining the biodegradable and environmentally friendly characteristics of the entire laminate structure.
Solution Approach 2:
The biodegradable polyester resin acts as an intermediary component in the adhesive layer, mediating between the polar polyvinyl alcohol resin layers and non-polar biodegradable resin layers. This intermediary material bridges the compatibility gap between different resin types, enabling effective bonding throughout the laminate while preserving biodegradability and environmental friendliness.
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to an adhesive resin composition including a biodegradable polyester resin (A) and a polyvinyl alcohol resin (B). In the adhesive resin composition, Expression (1): 0.30 < Y/X < 0.99 (1) [in which X represents the mass of the polyvinyl alcohol resin (B) included in a film including the adhesive resin composition and having a thickness of 300 µm, and Y represents the mass of the polyvinyl alcohol resin (B) extracted in hot water in immersion of the film in pure water at 80°C for 1 hour] is satisfied.