Modified Graphene Slurry for Anti-Corrosion Coatings
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Solution Overview
Problem
Current methods for preparing graphene are complex, costly, and result in agglomeration, making it difficult to achieve dispersion stability and effective modification for anti-corrosion coatings, especially in acidic or alkaline environments, and the existing graphene coatings are prone to failure.
Innovation Solution
A method involving the use of flake graphite powder, silicon molecular modifiers, and ultraviolet radiation to functionalize graphene, followed by high-energy radiation to form carbonyl and hydroxyl groups, which are then grafted with silicon hydroxyl groups, creating a modified graphene that can be easily dispersed and compounded with titanium to form a silicon-titanium modified graphene slurry, enhancing coating stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods for preparing graphene are used (epitaxial growth, vapor deposition, mechanical exfoliation, redox), then graphene can be obtained, but the preparation process becomes complex, costly, and the graphene tends to agglomerate, making it difficult to achieve dispersion stability
Solution Approach 1:
The patent applies preliminary action by introducing silicon molecular modifiers during the graphene preparation process itself, rather than attempting to modify agglomerated graphene afterward. The modifiers are incorporated into the graphene structure during synthesis, preventing agglomeration from the outset and enabling direct dispersion in coating systems without requiring subsequent redispersal of agglomerated powder.
Solution Approach 2:
The patent uses silicon molecular modifiers as intermediary substances that mediate between the graphene structure and the coating environment. These modifiers act as bridging agents that prevent direct agglomeration of graphene sheets while maintaining the barrier protection mechanism, solving the dispersion stability issue without requiring complex multi-step preparation processes.
2Manufacturing precision
If powder graphene is prepared first and then modified, then modification can be performed, but the agglomerated structure makes it difficult to reopen the lamellar structure and uniformly modify each lamella
Solution Approach 1:
The patent performs modification during the initial preparation stage rather than afterward. The silicon molecular modifiers are introduced and incorporated into the graphene structure during synthesis, ensuring uniform distribution across all lamellae before agglomeration can occur. This eliminates the difficulty of redispersing agglomerated powder for subsequent modification.
Solution Approach 2:
The patent merges the preparation and modification steps into a single integrated process. Instead of separately preparing graphene powder and then modifying it, the modification occurs concurrently with preparation, combining what were previously distinct operations into one unified process that achieves both uniform modification and prevention of agglomeration.
3Strength
If graphene is used as a filler in polymer materials, then the coating can be formed, but the free graphene acts only as a filler and brings about limited improvement on the mechanical properties of the paintcoat
Solution Approach 1:
The patent creates a composite material system where silicon molecular modifiers are integrated with the graphene structure. This composite approach transforms graphene from a simple filler into a functionally enhanced component with improved mechanical properties and corrosion resistance, while maintaining compatibility with polymer coating matrices.
Solution Approach 2:
The patent applies local quality by concentrating the modification at specific locations on the graphene structure where it interfaces with the polymer matrix. The silicon molecular modifiers are positioned to enhance local mechanical properties and adhesion at the graphene-coating interface, rather than requiring uniform modification throughout the entire graphene sheet.
4Reliability
If graphene is used in zinc-rich paintcoat to reduce zinc powder addition, then the excellent conductivity and barrier properties can be utilized, but in acidic, humid or strongly alkaline environment, the zinc-rich coating will quickly fail
Solution Approach 1:
The patent changes the chemical parameters of the coating system by introducing silicon molecular modifiers that alter the electrochemical properties. This modification shifts the coating's behavior away from relying on zinc-rich electrochemical protection toward a more stable barrier protection mechanism that resists degradation in acidic and alkaline environments.
Solution Approach 2:
The patent converts the potential harm of using graphene in zinc-rich coatings (which accelerates zinc corrosion in certain environments) into a benefit by using the modified graphene to create a stable barrier protection mechanism. The silicon-modified graphene provides corrosion resistance without triggering the galvanic couple corrosion that plagues zinc-rich systems in acidic and alkaline conditions.
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 method produces high-quality, dispersible modified graphene that forms a stable, long-lasting anti-corrosion coating with improved adhesion and corrosion resistance, suitable for both water and oil-based systems, reducing agglomeration and enhancing mechanical properties.
Implementation Method 1
putting the solid gas obtained in step S3 into a ultraviolet washing machine with wavelengths of 185 nm and 254 nm in sequence for ultraviolet high-energy radiation to produce micro burst, exfoliating to obtain modified graphene flakes, and simultaneously, functionally modifying the modified graphene flake with the solid gas to form carbonyl groups and carbon hydroxyl groups on the surface
Implementation Method 2
grafting the carbonyl groups and carbon hydroxyl groups with silicon hydroxyl groups formed by hydrolysis of the silicon molecular modifier by high energy radiation
Data Source
AI summary
A method for preparing modified graphene and a method for preparing a slurry containing the modified graphene are disclosed. The method for preparing a modified graphene comprises: putting a flake graphite powder, a silicon molecular modifier, water and a boric acid solution into a high pressure container, filling a liquid gas into the high pressure container, connecting the high pressure container to a solid gas preparation apparatus, to solidify the liquid gas and obtain a solid gas, putting the solid gas into a ultraviolet washing machine for ultraviolet high-energy radiation, exfoliating the graphene flake, continuously exposing to ultraviolet light for a period of time to form a modified graphene, continuously exposing the modified graphene under the ultraviolet light, and storing the modified graphene in vacuum as an intermediate.