Hydrophobic and oleophobic coating, preparation method therefor, and product
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Solution Overview
Problem
Current hydrophobic and oleophobic coating technologies face challenges due to the environmental concerns associated with perfluorinated compounds, such as PFASs, which are difficult to degrade and toxic, limiting their application and development, while existing methods for applying these coatings on fabrics are cumbersome and not suitable for large-scale production.
Innovation Solution
A hydrophobic and oleophobic coating is formed on a substrate using plasma enhanced chemical vapor deposition (PECVD) with perfluoropolyether or perfluoropolyether derivatives, which are environment-friendly and do not require immersion or etching of the fabric, allowing for a simpler and more scalable process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluorinated compounds (PFASs) are used to achieve hydrophobic and oleophobic properties, then excellent thermal stability, hydrophobicity and oleophobicity are obtained, but environmental pollution and health risks increase due to refractory degradation, bioaccumulation, and high toxicity
Solution Approach 1:
The patent extracts and removes the harmful perfluorinated compounds from the coating formulation while retaining the essential hydrophobic and oleophobic functionality through alternative fluorinated compounds that do not possess the same environmental persistence and toxicity characteristics
Solution Approach 2:
The patent converts the harmful environmental properties of traditional perfluorinated compounds into beneficial characteristics by selecting fluorinated compounds that provide similar performance (hydrophobicity, oleophobicity, thermal stability) without the harmful degradation resistance and bioaccumulation properties
2Reliability
If fabric is soaked in reaction kettle and stirring tank during synthesis process, then hydrophobic and oleophobic properties are achieved, but uneven impregnation occurs and the process is not suitable for large-sized fabric products
Solution Approach 1:
The patent replaces the mechanical immersion and stirring process with a plasma-enhanced chemical vapor deposition process, where the coating is applied through vapor-phase reaction on the fabric surface, eliminating the need for soaking and stirring while ensuring uniform coverage
Solution Approach 2:
The patent changes the physical state and application parameters of the coating process by transitioning from liquid-phase immersion to vapor-phase deposition, allowing the coating material to be applied in vapor form that uniformly condenses and reacts on the fabric surface regardless of fabric size
3Reliability
If perfluorinated compounds such as perfluoroacrylates and perfluorosiloxanes are used for coating, then superhydrophobicity and superoleophobicity are achieved, but environmental limitations are imposed due to use of perfluorinated compounds
Solution Approach 1:
The patent extracts the perfluorinated compound components from the coating formulation while maintaining the superhydrophobic and superoleophobic performance through alternative fluorinated compounds that do not suffer from the same environmental restrictions
Solution Approach 2:
The patent creates a universal coating solution that can be applied to various substrates and meets both performance requirements (superhydrophobicity, superoleophobicity) and environmental regulations, expanding the adaptability and application scope of the technology
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 significantly improves the water-repellent and oil-repellent properties of fabrics without causing environmental harm, making it suitable for large-scale production and application on various fabric types, including those with high nylon or cotton content.
Implementation Method 1
A hydrophobic and oleophobic coating is formed on a substrate using plasma enhanced chemical vapor deposition (PECVD)
Data Source
AI summary
Disclosed are a hydrophobic and oleophobic coating, a preparation method therefor and a product, wherein the hydrophobic and oleophobic coating is formed by the deposition of a perfluoropolyether or perfluoropolyether derivative on the surface of a substrate by means of PECVD, such that the hydrophobic and oleophobic properties of the surface of the substrate are improved by the perfluoropolyether or perfluoropolyether derivative coating. Further disclosed are a hydrophobic and oleophobic coating, a preparation method therefor and a product, wherein the hydrophobic and oleophobic coating comprises: at least a two-layer structure, one of the layers being formed by the plasma chemical vapor deposition of one or more perfluoropolyethers or perfluoropolyether derivatives as raw materials, and the other layer being formed by the plasma chemical vapor deposition of a silane- or siloxane-containing raw material, thereby improving the hydrophobic and oleophobic properties of the surface of a substrate.