Sulfonated Copolymer Coating for Long-Term Antimicrobial Protection
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Solution Overview
Problem
Current materials used in healthcare settings, such as wound dressings and HVAC systems, lack continuous and long-term antimicrobial properties, leading to increased hospital-acquired infections due to microbial growth in warm, dark, and humid environments.
Innovation Solution
A substrate with an antimicrobial coating comprising sulfonated copolymer powder embedded in entangled fibers with void spaces, where the powder is fused into the fibers at a temperature below 120°C, providing effective antimicrobial protection against a wide range of microbes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in healthcare settings, then the materials are easy to manufacture and use, but they lack continuous and long-term antimicrobial properties leading to microbial growth
Solution Approach 1:
The sulfonated copolymer powder is pre-deposited onto the substrate surface and embedded into the fiber void spaces before the substrate is put into service. This preliminary incorporation ensures that antimicrobial protection is present from the outset and continues over time as the polymer slowly releases or acts on microbes contacting the surface.
Solution Approach 2:
The substrate is designed with entangled fibers having void spaces that can accommodate and hold the sulfonated copolymer powder. This porous structure allows the antimicrobial agent to be integrated within the material matrix, providing sustained release and long-term protection rather than surface-only application.
2Reliability
If sulfonated copolymer powder is deposited into void spaces and heated to fuse, then antimicrobial coating is formed, but additional processing steps and energy are required
Solution Approach 1:
The thermoplastic polymer fibers in the substrate undergo a phase transition from solid to molten state when heated to temperatures above their melting point (but below 120°C). This melting allows the sulfonated copolymer powder to be fused and entrapped within the fiber matrix, creating a stable integrated coating. Upon cooling, the polymer re-solidifies, locking the antimicrobial powder in place.
Solution Approach 2:
The substrate's thermal properties are specifically selected - using thermoplastic polymers with melting points below 120°C - to enable the fusion process at controlled temperatures. This parameter selection allows the coating to be applied and stabilized through moderate heating without requiring extreme conditions or complex equipment.
3Ease of manufacture
If thermoplastic polymer with melting point below 120°C is used, then powder can be entrapped by heating, but the substrate has limited temperature resistance
Solution Approach 1:
The substrate structure is designed with a functional gradient: the outer surface layer uses thermoplastic polymer with low melting point to enable easy powder entrapment and coating formation, while the bulk interior material maintains structural integrity. This local differentiation allows the surface to be easily manufactured with antimicrobial coating while the overall substrate can withstand higher temperatures in service conditions.
Solution Approach 2:
The substrate is constructed as a composite material system combining thermoplastic polymer fibers (for low-temperature processing and powder entrapment) with potentially other materials or structural configurations that provide high-temperature resistance. This composite approach allows the material to exhibit both ease of coating application and adequate temperature resistance in different contexts.
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 substrate achieves a significant reduction in microbial concentration, effectively killing over 90% of microbes within minutes of contact, maintaining antimicrobial efficacy for extended periods, and can be applied to various healthcare and non-medical applications.
Implementation Method 1
the outer layer is heated to a temperature of less than 120° C. for the powder to be entrapped in the void spaces forming the antimicrobial coating
Implementation Method 2
the fibers comprise a thermoplastic polymer having a melting point of less than 120° C. After deposition of the powder into the void spaces, the outer layer is heated to a temperature of less than 120° C. for the powder to be fusion-bonded into the void spaces
Data Source
AI summary
A method for forming an antimicrobial coating on a substrate is provided. The method comprises dissipating and entrapping (embedding) sulfonated copolymer particles in void spaces or interstices of fibers of a fabric forming an outer layer of a substrate. The sulfonated copolymer is selected from the group of perfluorosulfonic acid polymers such as sulfonated tetrafluoroethylene, polystyrene sulfonates, sulfonated block copolymers, polysulfones such as polyether sulfone, polyketones such as polyether ketone, sulfonated poly(arylene ether), and mixtures thereof. The fibers comprise a thermoplastic polymer having a melting point of less than 120° C., or 45-110° C., or 45-80° C. The sulfonated copolymer forms an antimicrobial coating layer for killing at least 90% microbes in the air within 30 minutes of contact with the coating.