Removable Antibacterial Multilayer Coating for Low-Temperature Adhesion
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Solution Overview
Problem
Existing antibacterial and anti-COVID coatings lack effective adhesion to metal, plastic, and fabric surfaces, are not removable, and require complex, high-temperature processes, making them unsuitable for widespread application in hospital environments.
Innovation Solution
A multi-layer polymer matrix coating using graphene nanoplatelets and zinc oxide nanorods is applied by spraying, with Polycaprolactone (PCL) and Polyvinylpyrrolidone (PVP) as host polymers to ensure adhesion and distribution, utilizing eco-friendly solvents like ethanol and acetone for fast, low-temperature application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antibacterial coatings are applied to metal, plastic, and fabric surfaces, then antibacterial properties are achieved, but adhesion is insufficient and the coating cannot be removed
Solution Approach 1:
The patent applies a primer layer containing specific polymers (polyacrylic acid, polyvinyl alcohol, or carboxymethyl cellulose) before applying the antibacterial coating. This preliminary action prepares the surface to enhance both adhesion and controlled removability, resolving the contradiction by creating a bridge layer that bonds strongly to the substrate while allowing controlled removal of the top coating layer.
Solution Approach 2:
The coating system is divided into multiple layers: a primer layer for adhesion and a top coating layer containing silver nanoparticles for antibacterial activity. This segmentation allows each layer to perform its specific function - the primer ensures strong substrate bonding while the top layer provides antibacterial properties and controlled removability, thus resolving the adhesion-removability contradiction.
2Reliability
If high-temperature processes are used to apply antibacterial coatings, then coating durability is improved, but production complexity and energy consumption increase
Solution Approach 1:
The patent changes the temperature parameter from high-temperature conventional processes to low-temperature application (room temperature or mild heating). The primer layer formulation allows effective adhesion and coating formation at reduced temperatures, thereby improving process simplicity and reducing energy consumption while maintaining coating durability through the chemical composition of the primer rather than thermal processing.
Solution Approach 2:
The patent replaces thermal processing (high-temperature curing) with chemical bonding mechanisms in the primer layer. The primer polymers (polyacrylic acid, polyvinyl alcohol, or carboxymethyl cellulose) create strong adhesion through chemical interactions with the substrate, eliminating the need for high-temperature thermal processes and thereby reducing process complexity and energy requirements.
3Reliability
If complex multi-step processes are used to ensure adhesion, then adhesion strength is improved, but manufacturing ease deteriorates
Solution Approach 1:
The patent uses a pre-formulated primer layer containing specific polymers designed to provide strong adhesion in a single application step. This preliminary action consolidates multiple adhesion-enhancing steps into one coating application, maintaining strong adhesion strength while significantly simplifying the manufacturing process and improving ease of manufacture.
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 coating provides a removable, waterproof, and non-toxic barrier with high antibacterial and anti-COVID efficacy, ensuring excellent adhesion and uniform distribution of nanoparticles on various surfaces, while being easy to produce and cost-effective.
Implementation Method 1
The use of nanomaterials for creating antibacterial surface treatments can represent an innovative solution to this type of problem... graphene nanoplatelets... exhibit antimicrobial and anti-COVID activities
Implementation Method 2
graphene nanoplatelets... which are deposited by superficially spraying a continuous film... to promote the dispersion and uniform surface distribution of said nanoparticles
Implementation Method 3
Polycaprolactone (PCL)... which has excellent adhesion to resin and fabric surfaces... Polyvinylpyrrolidone (PVP) which, on the other hand, has excellent adhesion to metal surfaces
Implementation Method 4
capable of providing a removable barrier to prevent the development of bacteria and eliminate pathogens in direct contact therewith
Implementation Method 5
multi-layer polymer matrix coating with antibacterial and anti-COVID properties... high antibacterial and anti-COVID efficacy
Implementation Method 6
applied by spraying... superficially spraying a continuous film... deposited by spraying
Implementation Method 7
utilizing eco-friendly solvents like ethanol and acetone for fast, low-temperature application
Data Source
AI summary
A multi-layer coating with antibacterial and anti-COVID properties which is usable in various environments, including hospitals, and which can be easily deposited by spraying on different surfaces and capable of providing an effective removable barrier against pathogens and bacteria, which waterproof coating is characterized in that it uses graphene nanoparticles as an antibacterial and anti-COVID agent deposited by spraying a polymer material as a host layer on the surface to promote the dispersion and uniform surface distribution thereof, the polymer material being directly adhered by spraying to the surface to be coated or sprayed on a second polymer, in turn sprayed on the surface to be coated, which is used as an element to promote the adhesion of the first polymer forming the antibacterial and anti-COVID coating to the surface to be coated.