Water-Repellent Primer Layer with Nanodiamond Adhesion
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Solution Overview
Problem
Existing techniques face challenges in forming a water/oil-repellent layer with excellent abrasion resistance on various substrates, particularly due to difficulties in adhesion and the need for high-temperature or vacuum processes, which limits their applicability and productivity.
Innovation Solution
A water/oil-repellent member is created by forming a primer layer with an organosilicon compound having multiple silanol groups and nanodiamond, followed by a water/oil-repellent layer using a hydrolyzable fluorine-containing compound, applied through a wet or dry method at room temperature, enabling stable and easy application on diverse substrates without requiring vacuum or high-temperature processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorooxyalkylene group-containing polymer composition is used as a treatment agent, then water/oil-repellent property is improved, but adhesion to metals, metal oxides, and resins deteriorates
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the substrate (metal, metal oxide, or resin) and the fluorooxyalkylene group-containing polymer. The silane coupling agent contains both hydrolyzable groups that bond to the substrate and organic groups that are compatible with the fluoropolymer, thereby mediating the adhesion interface and enabling strong bonding between the substrate and the water/oil-repellent coating
Solution Approach 2:
The patent creates a composite treatment agent system comprising the fluorooxyalkylene group-containing polymer, silane coupling agent, and solvent. This composite formulation integrates the water/oil-repellent properties of the fluoropolymer with the adhesion-promoting characteristics of the silane coupling agent, achieving both excellent repellency and strong adhesion simultaneously
2Strength
If a SiO2 layer is provided by a dry method (vapor deposition or sputtering), then adhesion is improved, but device complexity and production cost increase due to vacuum processing requirements
Solution Approach 1:
The patent replaces the mechanical vacuum deposition process (sputtering or vapor deposition) with a chemical solution-based approach. Instead of using complex vacuum equipment to deposit SiO2 layers, the invention uses a silane coupling agent solution that can be applied by simple coating methods, allowing the silane to hydrolyze and form adhesive bonds at ambient or mild heating conditions, thereby eliminating the need for vacuum processing equipment
Solution Approach 2:
The patent changes the processing parameters from high-vacuum conditions to ambient or mild heating conditions. The silane coupling agent undergoes hydrolysis and condensation reactions at relatively low temperatures (or even at room temperature over time), transforming the adhesion mechanism from physical vapor deposition to chemical bonding under simplified thermal conditions
3Device complexity
If polysilazane solution is applied by a wet method, then device complexity is reduced, but long-time high temperature heating and humidification are required, reducing productivity
Solution Approach 1:
The patent modifies the reaction parameters by using silane coupling agents that can hydrolyze and condense at lower temperatures and shorter times compared to polysilazane. The silane system achieves adequate adhesion strength with reduced heating time and lower temperature requirements, thereby improving productivity while maintaining simple processing equipment
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 solution provides a water/oil-repellent film with excellent abrasion resistance and adhesion, suitable for various substrates, including metals, resins, and ceramics, and can be applied using common coating methods, enhancing the durability and ease of production.
Implementation Method 1
an organosilicon compound having a plurality of silanol groups in a molecule
Implementation Method 2
an organosilicon compound having a plurality of silanol groups in a molecule
Implementation Method 3
a hydrolyzable fluorine-containing compound
Data Source
AI summary
The invention provides a water- and oil-repelling member having a primer layer as a first layer on at least one surface of a base material and further having a water- and oil-repelling layer as a second layer on the outer surface of the primer layer. The primer layer comprises a layer containing nano-diamonds and having a film thickness of 0.5 to 500 nm, the main component being an organic silicon compound having a plurality of silanol groups within a molecule. The water- and oil-repelling layer comprises a layer having a film thickness of 0.5 to 30 nm, the main component being a cured product of a hydrolysable fluorine-containing compound. The water- and oil-repelling member can stably and simply impart a water- and oil-repelling coat having excellent abrasion resistance to various base materials. In addition, the primer layer and the water- and oil-repelling layer can be coated even in a room-temperature (25° C.) process.