Biodegradable Adhesive Resin Composition for Stronger 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) in the range of 0.3 to 0.99, where X is the mass of polyvinyl alcohol resin in a 300 μm film and Y is the mass extracted in hot water at 80°C for 1 hour, forming a co-continuous structure that enhances adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional adhesive layer is used in biodegradable laminate, then the laminate structure is simple, but the adhesive strength to both polyvinyl alcohol resin layer and biodegradable resin layer is insufficient
Solution Approach 1:
The adhesive layer uses a composite resin composition comprising both biodegradable polyester resin and polyvinyl alcohol resin. This composite structure enables the adhesive to bond effectively to both the biodegradable resin layer and the polyvinyl alcohol resin layer simultaneously, resolving the insufficient adhesive strength problem while maintaining biodegradability and functional compatibility.
2Reliability
If polyvinyl alcohol resin is highly soluble in water, then the biodegradability is improved, but the adhesive strength and structural integrity are reduced
Solution Approach 1:
The invention controls the solubility parameter of the polyvinyl alcohol resin by specifying that the mass extraction in hot water (Y) should be 5% or more but less than 50% of the total polyvinyl alcohol resin mass (X). This parameter optimization balances the biodegradability requirement (sufficient solubility) with the adhesive strength requirement (excessive solubility would compromise structural integrity).
Solution Approach 2:
By combining biodegradable polyester resin with controlled-solubility polyvinyl alcohol resin, the composite adhesive layer achieves both biodegradability and adequate adhesive strength. The biodegradable polyester resin provides structural framework and bonding capability, while the controlled-solubility polyvinyl alcohol resin ensures biodegradability without excessive dissolution that would weaken the adhesive structure.
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 adhesive resin composition achieves excellent adhesive strength to both polyvinyl alcohol and biodegradable resin layers, suitable for food packaging and agricultural films.
Implementation Method 1
Y represents a mass of the polyvinyl alcohol resin (B) extracted in hot water in extraction treatment of a soluble element by immersing the film in pure water at 80° C. for 1 hour
Data Source
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.