Bio-Based Hot-Melt Adhesive With Re-Bondable Wood Bond Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hot-melt adhesives rely on petroleum-based resins, which are environmentally unsustainable and may be depleted, necessitating a shift to more sustainable raw materials without compromising adhesiveness.
Innovation Solution
A hot-melt adhesive using a β-1,3-glucan derivative, derived from naturally occurring Euglena, with specific acyl group substitutions and molecular characteristics, achieving compressive shear bond strengths of 1.0 N/mm² or more and a softening temperature of 90 °C or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-based resins are used as raw materials for hot-melt adhesives, then excellent adhesiveness and processability are achieved, but environmental sustainability deteriorates and resource depletion risk increases
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by replacing petroleum-based resins with bio-based polymers (polyhydroxyalkanoates and polyesters). This substitution maintains the thermoplastic properties and adhesiveness while improving environmental sustainability and reducing dependence on fossil resources
Solution Approach 2:
The patent creates a composite adhesive system combining bio-based polymers (PHA and polyester) with specific functional additives. This composite approach ensures that the sustainable raw materials achieve the necessary adhesive performance, processability, and bonding strength comparable to petroleum-based alternatives
2Object-affected harmful factors
If bio-based polymers are used to replace petroleum resins, then environmental sustainability improves, but adhesiveness and bond strength may deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameters of the bio-based polymers (PHA with Mn 50,000-500,000 and polyester with Mn 10,000-500,000) to ensure adequate bond strength. By controlling these physical parameters, the adhesive achieves compressive shear bond strengths of 1.0 N/mm² or more while maintaining sustainability
Solution Approach 2:
The patent formulates a composite system combining PHA and polyester with specific weight ratios (PHA 20-80 wt%, polyester 20-80 wt%). This composite structure synergistically enhances the bond strength and thermal properties of the bio-based adhesive, ensuring it meets performance requirements while maintaining environmental benefits
3Reliability
If the softening temperature is increased to 90°C or higher, then re-bonding capability is improved, but the adhesive may become difficult to process
Solution Approach 1:
The patent carefully controls the softening temperature parameter within the range of 90-200°C by selecting appropriate bio-based polymer types and their combinations. This optimized temperature range enables re-bonding capability (maintaining adhesiveness after heating and re-bonding) while remaining processable with standard hot-melt adhesive equipment
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 β-1,3-glucan derivative adhesive provides high sustainability and excellent adhesiveness, suitable for bonding various materials, including ligneous materials, with maintained adhesiveness even after re-bonding, reducing environmental impact and resource consumption.
Implementation Method 1
hot-melt adhesives that use highly sustainable raw materials instead of petroleum-based resins
Implementation Method 2
bonding various materials by utilizing a heating and melting-cooling and solidifying cycle
Data Source
AI summary
Provided is a hot-melt adhesive that has high sustainability and excellent adhesiveness. The hot-melt adhesive comprises a β-1,3-glucan derivative and has a compressive shear bond strength in a specific range for a piece of wood.