Biodegradable Polyester Adhesive Composition for Fast Bond Strength
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Solution Overview
Problem
Existing biodegradable adhesives and inks based on polyhydroxyalkanoate resins suffer from issues such as marine environmental pollution due to un-decomposed monomers and require lengthy aging for sufficient adhesion strength, necessitating a solution with improved solubility in halogen-free solvents and rapid adhesion development.
Innovation Solution
A biodegradable polyester solution containing a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer with a specific 3-hydroxyhexanoate content and weight average molecular weight, dissolved in halogen-free organic solvents, exhibits good solubility and sufficient adhesion strength even after a short aging period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reactive monomer is used in the adhesive composition to achieve biodegradability in seawater, then biodegradability is improved, but marine environmental pollution occurs due to un-decomposed monomer units flowing out during decomposition
Solution Approach 1:
The patent changes the chemical composition parameters by using a copolymer with specific monomer ratios (3-hydroxybutyrate and 3-hydroxyhexanoate in controlled proportions) and controlling the glass transition temperature range. This parameter optimization ensures complete decomposition without leaving harmful monomer units while maintaining biodegradability in seawater.
Solution Approach 2:
The patent employs a composite adhesive composition combining polyhydroxyalkanoate resin with specific copolymer components and controlled molecular weight distribution. This composite structure enables complete biodegradation while preventing the release of harmful monomers, resolving the contradiction between biodegradability and environmental harm.
2Strength
If poly(3-hydroxybutyrate-co-4-hydroxybutyrate) is dissolved in butyl acetate to obtain adhesive, then adhesion strength is achieved, but 24 hours or more aging is required which leaves room for practical improvement
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to a specific range ( -50°C to -20°C) and controls the molecular weight distribution of the copolymer. These parameter changes enable the adhesive to achieve sufficient adhesion strength within a short aging time of 1 hour or less, dramatically reducing the time loss compared to conventional formulations requiring 24 hours or more.
3Reliability
If polyhydroxyalkanoate-based resin is used to achieve biodegradability in seawater, then environmental issues are addressed, but hardly any members for secondary processing with biodegradability in seawater have been provided
Solution Approach 1:
The patent develops a universal adhesive composition formula that can be applied to multiple secondary processing functions (adhesive, ink, coating agent) while maintaining biodegradability in seawater. The standardized copolymer formulation with controlled glass transition temperature and molecular weight serves as a multi-functional base material, significantly expanding the availability and versatility of biodegradable secondary processing members.
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 solution provides a biodegradable adhesive and ink with enhanced solubility in halogen-free solvents and immediate adhesion strength, reducing environmental impact and improving working conditions.
Implementation Method 1
a poly(3-hydroxybutyrate-co hydroxyhexanoate) copolymer (hereinafter referred to as 'PHBH') having an average content of 3-hydroxyhexanoate (hereinafter referred to as '3 HH') in a specific range has excellent solubility in a halogen-free organic solvent
Implementation Method 2
a biodegradable polyester solution that contains such a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer has sufficient adhesion strength even when aged for a short time
Data Source
AI summary
An object of an embodiment of the present invention is to provide a biodegradable polyester solution that exhibits good solubility in a halogen-free organic solvent and that has sufficient adhesive strength even when aged for a short time. The object is achieved by providing a biodegradable polyester solution containing a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer and a solvent, the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer having an average content of 16 mol % or more 3-hydroxyhexanoate.