Antimicrobial Plastic Surface Embedding for Safe Packaging
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Solution Overview
Problem
Existing moldable, extrudable, or thermoformable plastics with antimicrobial properties face challenges due to the toxicity of leachable agents and the difficulty in incorporating non-leaching agents that require direct microbial contact, making them unsuitable for food or healthcare packaging.
Innovation Solution
A method involving plasma treatment of plastic surfaces followed by application and hot pressing of non-leachable antimicrobial agents, such as Mg(OH)2 and MgO, to embed these agents within the plastic, ensuring effective antimicrobial properties without direct microbial contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leachable antimicrobial agents like CuCl2·2H2O are incorporated into moldable plastics, then antimicrobial activity is achieved, but toxicity to human cells occurs making them unsuitable for food or healthcare packaging
Solution Approach 1:
The patent uses a polymer matrix as an intermediary carrier to deliver antimicrobial agents. The polymer acts as a mediator that controls the release of antimicrobial agents, preventing direct leaching into food or contact with human cells while maintaining antimicrobial efficacy against microbes. This resolves the contradiction by introducing a controlling intermediate layer between the toxic agent and the human body.
Solution Approach 2:
The patent changes the physical and chemical parameters of antimicrobial agents by incorporating them into a polymer matrix at specific concentrations and configurations. This modification alters their release behavior, transforming them from immediately leachable (toxic) forms to controlled-release forms that maintain antimicrobial activity while reducing toxicity to human cells.
2Object-affected harmful factors
If non-leaching antimicrobial agents like Mg(OH)2 are used, then safety for food or healthcare packaging is achieved, but difficulty in incorporating them into moldable, extrudable, or thermoformable plastics occurs
Solution Approach 1:
The patent merges non-leaching antimicrobial agents with moldable plastics by incorporating them into a polymer matrix. This combination allows the antimicrobial agents to be integrated into the plastic structure while maintaining the plastic's moldability, extrudability, and thermoformability characteristics, thus resolving the manufacturing difficulty.
Solution Approach 2:
The patent creates composite materials by combining non-leaching antimicrobial agents with moldable plastics. This composite approach allows the beneficial properties of both materials to coexist: the safety and non-toxicity of Mg(OH)2 combined with the processability of moldable plastics, enabling easy incorporation while maintaining safety for food or healthcare packaging.
3Reliability
If cationic polymers like poly(ethylene imine) are engineered with antimicrobial properties, then antimicrobial characteristics are achieved, but water solubility or water swelling occurs making them unsuitable for structural uses
Solution Approach 1:
The patent applies local quality by incorporating antimicrobial agents specifically into the surface or specific regions of the moldable plastic rather than making the entire polymer water-soluble. This localized approach provides antimicrobial characteristics where needed while maintaining the overall structural integrity and water resistance of the plastic material.
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 method produces plastics with embedded antimicrobial agents that provide continuous protection against microbes, suitable for food and healthcare packaging, while maintaining safety and effectiveness.
Implementation Method 1
the pre-treating of the surface of the plastic article includes a plasma treatment
Implementation Method 2
hot pressing the precursor assembly to embed the non-leachable antimicrobial agents within the surface of the plastic article
Implementation Method 3
applying pressure greater than or equal to about 0.5 bars to less than or equal to about 5 bars
Data Source
AI summary
A method for preparing the antimicrobial plastic includes contacting a non-leachable antimicrobial agent to a surface of a plastic article to form the antimicrobial plastic. In certain variations, the contacting includes applying a precursor antimicrobial layer including non-leachable antimicrobial agents to a surface of a plastic article to form a precursor assembly and hot pressing the precursor assembly to embed the non-leachable antimicrobial agents within the surface of the plastic article to form the antimicrobial plastic. In other variations, the contacting includes preparing an antimicrobial layer including a non-leachable antimicrobial agent on a foil and transferring the antimicrobial layer from the foil to the surface of the plastic article to form the antimicrobial plastic, where the transferring includes contacting the antimicrobial layer and the surface of the plastic article and applying a transfer temperature that is greater than a softening temperature of the plastic article.