Deacetylated Chitosan Adhesive Composition for Structural Bonding
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Solution Overview
Problem
Current structural adhesives, primarily of synthetic origin, pose health and environmental risks due to volatile organic compounds (VOCs) and have limitations in shear stress resistance, with deacetylated chitosan-based adhesives only able to withstand up to 2.5 MPa, which is insufficient for many industrial applications.
Innovation Solution
An adhesive composition comprising 3-10% deacetylated chitosan with a deacetylation degree of 75% or higher, combined with 0.5-5% organic or inorganic acid, 0.001-8% polyanionic compounds, 0.001-2% polyols, and an aqueous support, along with a polysaccharide filler, to enhance bonding strength and antimicrobial properties while reducing withdrawal issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If deacetylated chitosan is used as adhesive base, then health and environmental safety is improved, but shear stress resistance deteriorates (only 2-2.5 MPa)
Solution Approach 1:
The patent creates a composite adhesive system by combining deacetylated chitosan (natural polymer) with synthetic polyacrylic acid and crosslinking agents. This composite approach allows the adhesive to maintain the environmental benefits of natural polymers while achieving structural-grade shear strength (≥7 MPa) through synergistic interactions between components.
Solution Approach 2:
The patent modifies the chemical parameters of chitosan by controlling deacetylation degree (≥75%) and using crosslinking agents to alter molecular weight and network structure. These parameter changes transform chitosan from a low-strength natural adhesive to a high-strength structural adhesive capable of withstanding ≥7 MPa shear stress.
2Strength
If synthetic adhesives are used, then shear stress resistance is improved (>7 MPa), but health and environmental safety deteriorates (VOCs and toxic compounds)
Solution Approach 1:
The patent changes the chemical composition parameters by replacing synthetic polymer bases with natural deacetylated chitosan, while maintaining structural performance through controlled deacetylation degree (≥75%) and crosslinking. This eliminates VOCs and toxic compounds while achieving ≥7 MPa shear strength.
Solution Approach 2:
The patent copies the functional structure of synthetic adhesives using natural polymers. By mimicking the crosslinked network structure and molecular weight characteristics of synthetic structural adhesives through chitosan modification, the patent achieves comparable mechanical performance without the harmful chemical components.
3Ease of manufacture
If simple chitosan solutions are used, then formulation simplicity is improved, but adhesive strength deteriorates (≤2.5 MPa)
Solution Approach 1:
The patent performs preliminary deacetylation of chitosan to achieve ≥75% deacetylation degree before adhesive formulation. This pre-modification step creates a more reactive and soluble polymer base that subsequently forms stronger adhesive bonds, transforming simple chitosan into a high-performance adhesive precursor.
Solution Approach 2:
The patent introduces polyacrylic acid and crosslinking agents as intermediary substances that mediate between the natural chitosan polymer and the final adhesive network. These intermediaries facilitate crosslinking and enhance adhesion strength while maintaining relative formulation simplicity through well-defined addition steps.
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 composition achieves shear strengths ranging from 7 to 100 MPa, comparable to synthetic adhesives, while minimizing environmental impact and health risks, with improved adhesive properties and reduced application volume requirements.
Implementation Method 1
adhesive compositions comprising deacetylated chitosan solubilized in a solution of acetic acid
Implementation Method 2
Structural adhesive bonding is a technology currently used for joining up all types of materials
Data Source
AI summary
The present invention relates to an adhesive composition comprising at least one deacetylated chitosan, an acid and an additional compound.