Bio-Based Adhesive Composition Using Lysine and Citric Acid
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Solution Overview
Problem
Conventional adhesives derived from petroleum-based monomers pose environmental and health concerns due to endocrine-disrupting chemicals, toxicity, and difficulty in natural decomposition, requiring high-temperature and alkaline conditions for removal, which leads to secondary environmental pollution.
Innovation Solution
An adhesive composition comprising lysine and citric acid in an aqueous solution, with a specific molar ratio, that forms an ionic hydrogen bond, maintaining adhesion without precipitating, allowing for reversible attachment and detachment, and easy water-based removal without harming the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional petroleum-based adhesives are used to achieve strong adhesion, then adhesive strength is improved, but environmental pollution and health hazards worsen
Solution Approach 1:
The patent changes the chemical composition parameters by replacing petroleum-based monomers with bio-based monomers (lysin e and citric acid), transforming the adhesive from harmful to environmentally friendly while maintaining adhesion performance
Solution Approach 2:
The patent uses biodegradable bio-based monomers that can be naturally decomposed, replacing persistent petroleum-based polymers. This allows the adhesive to serve its function and then break down harmlessly, eliminating long-term environmental pollution
2Ease of operation
If conventional water-removable adhesives are used to enable easy removal, then removal ease is improved, but high energy consumption and secondary pollution worsen
Solution Approach 1:
The patent replaces the mechanical/thermal removal system (high-temperature and alkaline conditions) with a chemical-biological system where water alone can remove the adhesive. The bio-based monomers are designed to be water-soluble, eliminating the need for energy-intensive removal processes
Solution Approach 2:
The adhesive composition is designed to be self-removable by water without requiring additional energy input or complex removal systems. The bio-based monomers naturally dissolve in water, allowing the adhesive to remove itself passively
3Reliability
If petroleum-based monomers are used to achieve good adhesion, then adhesive performance is improved, but production limitations and toxicity worsen
Solution Approach 1:
The patent fundamentally changes the chemical identity of the monomers from petroleum-derived to bio-derived (lysin e and citric acid), altering the molecular structure to eliminate toxic properties while preserving adhesive functionality
Solution Approach 2:
The patent adopts biodegradable bio-based monomers that are naturally decomposable, replacing persistent petroleum-based polymers. This allows the adhesive to serve its function and then break down harmlessly, eliminating long-term environmental pollution
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 composition exhibits excellent adhesion, storage stability, and environmental friendliness, with the ability to be easily removed from substrates using water, reducing environmental impact and improving workability compared to conventional organic solvent-type adhesives.
Implementation Method 1
An adhesive composition comprising lysine and citric acid in an aqueous solution, with a specific molar ratio, that forms an ionic hydrogen bond, maintaining adhesion without precipitating
Data Source
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Figure 3A~3D
Figure 4A~4D
AI summary
Provided is an adhesive composition including lysine, citric acid, and water, wherein the lysine and the citric acid are present in the form of an aqueous solution of a salt such that precipitates are not formed in the aqueous solution. In addition, provided is a method of preparing an adhesive composition including mixing lysine, citric acid, and water to thereby form a mixture of the lysine, the citric acid, and the water, and stirring the mixture at a temperature of 80 °C or less, wherein amounts of the lysine, the citric acid, and the water are adjusted such that precipitates of the lysine and the citric acid do not form in the adhesive composition.