Product with reversible water-repellent or super water-repellent properties for coating porous textile and ceramic materials
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Solution Overview
Problem
Existing surface treatments lack the ability to dynamically and reversibly switch between hydrophobic and hydrophilic states in response to external stimuli, such as pH variations or ion exchange, while also providing effective oil repellency and reducing bioreceptivity.
Innovation Solution
A sol-based coating comprising aminoalkyl alkoxysilane, silicon dioxide nanoparticles, and a non-ionic surfactant, which can be applied to porous materials, altering surface properties through protonation-deprotonation or metal ion complexation, inducing reversible hydrophilia and oil repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface treatments are applied to provide hydrophobic properties, then water repellency is improved, but the ability to dynamically switch between hydrophobic and hydrophilic states is lost
Solution Approach 1:
The coating incorporates amino groups that can dynamically change their protonation state in response to pH variations, enabling the surface to reversibly switch between hydrophobic and hydrophilic states. This dynamic behavior allows the material to adapt its wetting properties based on environmental conditions while maintaining effective water repellency in its hydrophobic state.
Solution Approach 2:
The invention utilizes changes in pH as a control parameter to trigger the protonation-deprotonation equilibrium of amino groups within the coating. By adjusting the pH, the surface properties can be switched between hydrophobic and hydrophilic states, providing adaptability without compromising the fundamental water repellent capability of the coating system.
2Adaptability or versatility
If functionalized nanoparticles are used to achieve reversible wetting properties, then adaptability is improved, but treatment time and complexity increase
Solution Approach 1:
The invention employs a sol-gel process that leverages pH parameter changes to control the protonation state of amino groups, achieving reversible wetting properties without requiring complex nanoparticle functionalization. This approach significantly reduces treatment time and process complexity compared to nanoparticle-based methods while maintaining the desired adaptability.
Solution Approach 2:
The invention extracts and utilizes the essential functional component (amino groups with pH-responsive protonation behavior) from complex nanoparticle systems. By using simple aminoalkyl alkoxysilane compounds instead of fully functionalized nanoparticles, the treatment process becomes faster and less complex while retaining the reversible wetting capability.
3Adaptability or versatility
If aminoalkyl alkoxysilane coating is applied to provide reversible hydrophilia, then adaptability is improved, but oil repellency in water immersion is reduced
Solution Approach 1:
The coating is designed with a specific composition ratio where hydrophobic alkoxysilane components dominate the bulk structure, ensuring oil repellency under water immersion. The amino groups are distributed within this hydrophobic matrix, providing localized pH-responsive hydrophilic regions that enable reversible wetting switching without compromising the overall oil-repellent performance.
Solution Approach 2:
The invention creates a composite coating system combining hydrophobic alkoxysilane components with amino-functionalized regions. This composite structure allows the hydrophobic matrix to provide oil repellency under water while the amino groups provide pH-responsive reversible hydrophilic behavior, achieving both properties simultaneously through synergistic material design.
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 surfaces with reversible hydrophobic and oil-repellent properties, enhancing stain removal and maintaining protection against water and water-soluble agents, while reducing bioreceptivity and microbial load.
Implementation Method 1
amino groups, which, by protonation and deprotonation, can establish pH balances and modify the influence of an organically modified silica hydrophobic matrix
Implementation Method 2
these functional groups are capable of complexing metal cations, such as: copper, silver or zinc which, in addition to modifying the wetting properties of the surface in a reversible manner by means of a metallic complex formation equilibrium
Implementation Method 3
modify the influence of an organically modified silica hydrophobic matrix, based on alkoxysilanes
Data Source
AI summary
A product specifically designed to coat porous textile and ceramic materials, which provides the material with a combination of hydrophobic properties and which can also be reversed, in response to variations in pH or the presence of transition metal cations, by a mechanism of induced hydrophilia that generates oil repellence upon contact with water, hereby facilitating the removal of any stain deposited on the surface of the material, while maintaining a protective effect against water and water-soluble agents. The product is also designed to reduce bioreceptivity by subsequent treatment with metal cations with proven biocidal effect, and to be used in other potential applications such as the generation of filtering fabrics for the separation of water/oil mixtures.