Phenolic Fatty Acid Epoxy Curing Agents for Antimicrobial Coatings
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Solution Overview
Problem
Conventional antimicrobial agents face issues with residual toxicity, volatility, and environmental impact, while existing antimicrobial epoxy polymers lack water resistance and are often derived from petroleum-based materials, necessitating the development of bio-based, non-volatile, and effective antimicrobial solutions.
Innovation Solution
The synthesis of phenolic-branched chain fatty acid (PBC-FA) based epoxy curing agents by reacting PBC-FA methyl ester with polyamines, such as ethylenediamine, to create antimicrobial epoxy polymers that can be used in coatings, providing both antimicrobial activity and environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antimicrobial agents are used, then antimicrobial activity is achieved, but residual toxicity and environmental harm occur
Solution Approach 1:
The patent changes the molecular weight parameter of antimicrobial agents by incorporating them into polymeric structures. This transformation maintains antimicrobial activity while eliminating residual toxicity issues associated with low molecular weight biocides, as the polymeric form prevents leaching and residual contamination.
Solution Approach 2:
The patent creates composite antimicrobial polymers by combining antimicrobial moieties with polymeric backbones. This composite structure integrates the antimicrobial function into the polymer matrix, providing sustained activity without the harmful residual effects of conventional small-molecule biocides.
2Reliability
If low molecular weight biocides are used, then antimicrobial effect is achieved, but volatility and chemical instability occur
Solution Approach 1:
The patent changes the physical state and molecular weight parameters by converting small-molecule biocides into polymeric forms. This eliminates volatility while maintaining antimicrobial effectiveness, as the polymeric structure prevents evaporation and enhances chemical stability.
Solution Approach 2:
The patent segments the antimicrobial function from the carrier by incorporating antimicrobial moieties into polymeric chains. This segmentation allows the antimicrobial activity to be distributed throughout the polymer structure, providing stable, non-volatile protection.
3Reliability
If quaternary ammonium salt-functional epoxy compounds are used, then antimicrobial activity is achieved, but water resistance is lost
Solution Approach 1:
The patent applies local quality by incorporating hydrophobic phenolic-branched chain fatty acid structures into the polymer backbone at specific locations. This local hydrophobicity compensates for the hydrophilic nature of curing agents, maintaining overall water resistance while providing antimicrobial activity through the phenolic groups.
4Reliability
If petroleum-based antimicrobial polymers are used, then antimicrobial performance is achieved, but environmental sustainability is reduced
Solution Approach 1:
The patent changes the origin parameter of the polymer materials by replacing petroleum-based feedstocks with renewable plant-derived resources. This substitution maintains antimicrobial performance while improving environmental sustainability through biodegradability and reduced fossil fuel dependency.
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 resulting PBC-FA-based epoxy polymers demonstrate significant antimicrobial activity against both Gram-positive and Gram-negative bacteria, with the phenolic group playing a crucial role in bacterial inactivation, and exhibit improved stability and water resistance, making them suitable for various applications.
Implementation Method 1
The resulting PBC-FA-based epoxy polymers demonstrate significant antimicrobial activity against both Gram-positive and Gram-negative bacteria, with the phenolic group playing a crucial role in bacterial inactivation
Implementation Method 2
The synthesis of phenolic-branched chain fatty acid (PBC-FA) based epoxy curing agents by reacting PBC-FA methyl ester with polyamines
Data Source
AI summary
Compositions containing at least one compound of formula Iwhere R1 is a phenolic compound (e.g., simple phenol, creosote, thymol, or carvacrol), and where R2 is a polyamine (e.g., ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), hexamethylenediamine (HDA)); and optionally a carrier; the compositions may additionally contain at least one epoxy resin. Methods for killing microorganisms involving contacting the microorganisms with an effective microorganism killing amount of the above composition. Compositions containing at least one compound produced by a method involving reacting phenolic-branched chain fatty acid methyl ester with at least one polyamine.