Phosphorylated Soy Flour Adhesive for Formaldehyde-Free Bonding
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Solution Overview
Problem
Current adhesives used in plywood and particle board, such as urea-formaldehyde and phenol-formaldehyde, emit formaldehyde and other hazardous gases, necessitating the development of alternatives with similar performance but without toxic emissions, and these modifications often rely on petroleum-based solvents and chemicals, which may also outgas harmful vapors.
Innovation Solution
A soy flour-based adhesive is improved through chemical phosphorylation of lysine residues, enhancing its adhesive strength and water resistance without the use of petroleum-derived chemicals, utilizing oxidizing agents to form cross-linking bonds and removing excess salts to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urea-formaldehyde or phenol-formaldehyde adhesives are used, then adhesive performance and durability are improved, but formaldehyde emissions and environmental hazards increase
Solution Approach 1:
The patent changes the chemical composition parameters by using phosphorylated soy flour instead of formaldehyde-based adhesives, maintaining adhesive performance while eliminating formaldehyde emissions through a different chemical mechanism (phosphorylation cross-linking)
Solution Approach 2:
The patent creates a composite adhesive system combining phosphorylated soy flour with oxidizing agents and cross-linking agents, achieving the reliability of synthetic adhesives while using renewable biological materials to avoid harmful emissions
2Reliability
If SPI is modified with petroleum-based chemicals (phenol, thiol, maleyl, amino, hydroxyl groups), then adhesive qualities are improved, but dependence on petroleum resources and potential harmful vapors increase
Solution Approach 1:
The patent changes the modification approach from adding petroleum-based functional groups to using phosphorylation with oxidizing agents, achieving improved adhesive qualities through a green chemistry pathway that avoids petroleum derivatives
Solution Approach 2:
The patent enables soy flour to self-modify through phosphorylation reactions with oxidizing agents, eliminating the need for external petroleum-based chemical additives while achieving the desired adhesive property enhancements
3Reliability
If PAE cross-linking agent is added to SPI, then water resistance is improved, but petroleum-based chemical dependency and cost increase
Solution Approach 1:
The patent enables the soy flour itself to provide cross-linking functionality through phosphorylation with oxidizing agents, eliminating the need for external PAE cross-linking agents while achieving comparable water resistance
Solution Approach 2:
The patent changes the cross-linking mechanism from PAE-based to phosphorylation-based, achieving water resistance through a different chemical pathway that uses green oxidizing agents instead of petroleum-derived cross-linkers
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 phosphorylated soy flour adhesive achieves wet and dry adhesion strengths comparable to conventional adhesives, meeting regulatory standards for interior plywood and particle boards while being environmentally safer, with improved water resistance and reduced hazardous emissions.
Implementation Method 1
at least a portion of ε-amino moieties in lysine residues present in the soy flour are phosphorylated
Implementation Method 2
utilizing oxidizing agents to form cross-linking bonds
Data Source
AI summary
Adhesives made from phosphorylated legume and oil seed flours are described. The adhesive composition includes water and a legume and/or oil seed flour in which at least a portion of ε-amino moieties in lysine residues present in the flour are phosphorylated. An oxidizing agent may also optionally be added to the adhesive composition.