A graphene film covering a ship bottom and a film coating method thereof

Abstract

This invention discloses a graphene film for covering the bottom of a ship and its coating method. The graphene film of this invention is a multilayer graphene film, comprising Cu and multilayer graphene grown on a copper foil, denoted as nGr / Cu; GO is functionalized and ClO is grafted onto it. ‑ Ions, yielding GO-ClO ‑ GO-ClO is directly adsorbed onto nGr / Cu with a positive charge. ‑ Cu / nGr / GO-ClO was obtained. ‑ Compared to simply applying a toxic anti-adsorption bio-coating, followed by removing the adsorbed shellfish and repainting (a process that requires significant time and expense), replacing the bio-adsorption with positive and negative charges allows for faster updates, saving time. Furthermore, it utilizes the enrichment of heavy metal ions already present in seawater to kill plankton.

Description

Technical Field

[0001] This invention discloses a graphene film for covering the bottom of a ship and its coating method, relating to the field of ship coating technology. Background Technology

[0002] The adsorption of shellfish on the hull of ocean-going vessels has always been a challenging problem. Over time, the increase in shellfish on the hull increases drag, leading to higher fuel consumption and ultimately affecting navigation. Therefore, ocean-going vessels require hull maintenance every one to two years, involving the removal of the adsorbed shellfish and repainting – a time-consuming and costly process. Theoretically, shellfish are less likely to adsorb during high-speed navigation; adsorption typically occurs under stationary or low-speed conditions. Therefore, environmental control of the water surface adjacent to the hull under stationary or low-speed conditions is an effective method to mitigate shellfish adsorption.

[0003] Currently, to prevent marine organisms from adhering to parts of ships, seabed structures, and other surfaces in contact with seawater, highly toxic inorganic or organic agents are added to antifouling coatings. These agents slowly dissolve into the seawater, directly or indirectly killing the adsorbed organisms. However, because the dissolution rate of the agents cannot be effectively adjusted in real time, it is impossible to achieve efficient antifouling based on environmental factors such as seasons, ocean currents, and water quality changes. Moreover, adding highly toxic agents to prevent adsorption is itself a form of pollution to the marine environment.

[0004] In the prior art, CN110294083A discloses a method for antifouling underwater parts of a ship's hull. This method involves electrifying the coating, using an electrolytic method to ensure the coating is covered with hypochlorite ions, thus preventing the attachment of marine organisms to the hull. However, this method uses graphene to coat the hull surface, and the conductive coating may be subject to physical wear or chemical corrosion during use, leading to a gradual decline in its performance. Furthermore, the coating in the prior art cannot self-repair or renew itself, requiring regular maintenance and replacement. Additionally, the sodium hypochlorite produced after electrolysis still causes significant environmental pollution. Summary of the Invention

[0005] The purpose of this invention is to provide a graphene film for covering the bottom of a ship and its coating method, which solves the problems of existing ship coatings that cannot be repaired regularly and that some electrolytic-based coatings cause pollution to the ocean.

[0006] To achieve the above-mentioned technical objectives and effects, the invention is implemented through the following technical solution:

[0007] A graphene film covering the bottom of a ship is a multilayer graphene film comprising Cu and multilayer graphene grown on a copper foil, denoted as nGr / Cu.

[0008] Functionalizing GO by grafting ClO - Ions, yielding GO-ClO - GO-ClO is directly adsorbed onto nGr / Cu with a positive charge. - Cu / nGr / GO-ClO was obtained. - .

[0009] Furthermore, the following steps are included:

[0010] S1, Preparation of Cu / nGr / GO-ClO - ;

[0011] S2, Cu / nGr / GO-ClO - It is fixed to the steel structure on the bottom of the ship.

[0012] Furthermore, S1 specifically includes:

[0013] S101. Multilayer graphene films are grown on copper foil using chemical vapor deposition (CVD) to obtain nGr / Cu.

[0014] S102, Combine GO with ClO-rich - The reaction of sodium hypochlorite solution with ions yields GO-ClO. - ;

[0015] S103, Positively charged adsorption of GO-ClO onto nGr / Cu - To obtain Cu / nGr / GO-ClO - film.

[0016] Furthermore, S2 specifically includes:

[0017] The prepared Cu / nGr / GO-ClO - The film is applied laterally starting from the ridge of the ship, and to prevent it from falling off, Cu / nGr / GO-ClO is applied. - The thin film is bolted to the stainless steel structure of the hull bottom because Cu / nGr / GO-ClO - The copper foil in the film is a copper foil with a certain thickness (4.5-50μm), so it can be fixed to the stainless steel structure at the bottom of the ship with bolts.

[0018] Furthermore, the film is periodically maintained, and the maintenance process includes:

[0019] First to Cu / nGr / GO-ClO -A continuous flow of positive charge causes GO to be adsorbed. However, as seawater washes over the GO, the amount of GO adsorbed gradually decreases. Once the adsorption amount decreases to a certain level, the flow of positive charge to Cu / nGr is stopped, and negative charge is introduced instead. The negative charge repels GO, causing the old GO-ClO adsorbed on Cu / nGr to be released. - It peels off and becomes a Cu / nGr film.

[0020] Furthermore, the Cu / nGr / GO-ClO - The thin film is updated as follows:

[0021] Submerge the bottom of the ship until it contains GO-ClO. - In water bodies, Cu / nGr is re-introduced with a positive charge to adsorb GO-ClO. - This will yield a new Cu / nGr / GO-ClO - The structure of GO-ClO is completed. - Update.

[0022] Furthermore, when GO-ClO - After complete loss, a negative charge is introduced into the remaining Cu / nGr structure, causing heavy metal ions from seawater to accumulate around the Cu / nGr structure.

[0023] Beneficial effects:

[0024] Compared to simple anti-adsorption bio-coating with toxic agents, the two-stage anti-adsorption method can double the anti-adsorption effect.

[0025] Compared to simply applying a toxic anti-adsorption bio-coating, followed by removing the adsorbed shellfish and repainting (a repair process that requires a lot of time and money), replacing the bio-adsorption with positive and negative charges can complete the replacement in a shorter time, saving time.

[0026] Applying a bio-adsorption-resistant coating containing toxic agents directly to the bottom of the ship, utilizing the attraction of positive and negative charges, will have a greater resistance to peeling off, thus extending the time of bio-adsorption resistance.

[0027] By enriching the heavy metal ions already present in seawater (avoiding the inflow of toxic agents), the method can kill plankton. Furthermore, by assessing environmental factors such as seasonality, ocean currents, and water quality changes, the enrichment level of heavy metal ions can be adjusted to efficiently kill plankton, ultimately reducing the amount of organisms adsorbed by shellfish.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] Figure 1This is a flowchart of the graphene film coating method for covering the bottom of a ship according to an embodiment of the present invention;

[0030] Figure 2 The preparation of Cu / nGr / GO-ClO as described in the embodiments of the present invention - flow chart;

[0031] Figure 3 The Cu / nGr / GO-ClO described in the embodiments of the present invention - Structural diagram; Detailed Implementation

[0032] To more clearly illustrate the technical solution of the present invention, the present invention will be described in detail below with reference to embodiments.

[0033] like Figure 1-3 As shown

[0034] Example 1

[0035] In this embodiment, a multilayer graphene film with a thickness of 4.5–50 μm was grown on a copper foil using chemical vapor deposition (CVD) to obtain nGr / Cu; 2. Commercially available GO was functionalized, mainly by grafting ClO. - The grafting process involves the reaction of GO with a sodium hypochlorite solution rich in ClO- ions. Since ClO- ions are the active ingredient in bactericides, GO-ClO- is obtained, giving it the ability to kill adsorbed or planktonic organisms. Alternatively, GO-ClO- can be directly adsorbed onto nGr / Cu using a positive charge (GO carries a negative charge), resulting in Cu / nGr / GO-ClO-. - 4. Finally, Cu / nGr / GO-ClO - It is fixed to the steel structure of the ship.

[0036] The Cu / nGr / GO-ClO - The structure's operation is divided into two cycles: the first cycle is the process of converting Cu / nGr / GO-ClO. - A continuous flow of positive charge is introduced into the structure to allow GO to adhere efficiently to the Cu / nGr surface, at which point ClO on the GO... - Ions can continuously kill adsorbed organisms or plankton, but because the impact of seawater during navigation is unavoidable, the amount of GO adsorbed will gradually decrease over time until it disappears. Periodic maintenance can be achieved by suddenly stopping the introduction of positive charges into Cu / nGr and switching to negative charges in a specific scenario. At this point, the old GO-ClO- adsorbed on Cu / nGr will suddenly detach, and new GO-ClO- can then be injected into the water. - Furthermore, by reintroducing a positive charge into Cu / nGr, a new Cu / nGr / GO-ClO can be obtained.- The structure allows for the completion of GO-ClO in a relatively short time. - Update;

[0037] The second cycle is if GO-ClO cannot be performed for some reason. - The update can be achieved by introducing a negative charge into the remaining Cu / nGr structure. At this time, based on the mutual attraction between positive and negative ions, heavy metal ions such as cadmium and lead can be adsorbed by controlling the input potential. Since the content of heavy metal ions in seawater is already relatively high, the heavy metal ions enriched around the Cu / nGr structure can kill adsorbed organisms or plankton. Moreover, the raw material source is seawater. Furthermore, the enrichment degree of heavy metal ions can be adjusted by judging environmental factors such as season, ocean currents, and water quality changes to effectively exert the function of preventing adsorption of organisms.

[0038] Example 2

[0039] Cu / nGr / GO-ClO - The specific steps involved in fixing the vessel to the bottom steel structure are as follows:

[0040] The prepared Cu / nGr / GO-ClO - The film is applied laterally, starting from the ridge of the ship. This process requires precise control to ensure the film is evenly applied to the steel structure of the hull. In some cases, bolts are used to secure the film to the stainless steel structure of the hull during application to prevent it from detaching during ship operation.

[0041] In this embodiment, the selection of bolts needs to consider their compatibility with the Cu / nGr / GO-ClO- film and their stability in a marine environment. Furthermore, the bolt placement and density must ensure that the film adheres evenly to the hull bottom while also resisting the effects of the marine environment.

[0042] In this embodiment, the copper foil in the Cu / nGr / GO-ClO- film is a copper foil with a certain thickness (4.5-50 μm). The thickness of this copper foil needs to be precisely controlled to ensure that it can be stably fixed on the steel structure of the ship's bottom, while also ensuring its electrical conductivity and corrosion resistance.

[0043] In addition, factors such as the ship's operating environment, the shape and size of the hull, and the materials used in the hull's steel structure can all affect the fixation effect and service life of the Cu / nGr / GO-ClO- film. A comprehensive consideration is required for optimal implementation.

[0044] The above are merely some of the embodiments of this application and are not intended to limit the application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments shall still fall within the scope of protection of the technical solution of this application.

Claims

1. A method for coating a graphene film onto the bottom of a ship, characterized in that, Includes the following steps: S1, Preparation of Cu / nGr / GO-ClO - ; S2, Cu / nGr / GO-ClO - The coating is applied by fixing it to the steel structure at the bottom of the ship. The graphene film covering the bottom of the ship is a multilayer graphene film, including Cu and multilayer graphene grown on copper foil, denoted as nGr / Cu; GO is functionalized by grafting ClO. - Ions, yielding GO-ClO - GO-ClO is directly adsorbed onto nGr / Cu with a positive charge. - Cu / nGr / GO-ClO was obtained. - .

2. The method for coating a graphene film covering the bottom of a ship according to claim 1, characterized in that, S1 specifically includes: S101. Multilayer graphene films are grown on copper foil using chemical vapor deposition (CVD) to obtain nGr / Cu. S102, Combine GO with ClO-rich - The reaction of sodium hypochlorite solution with ions yields GO-ClO. - ; S103, Positively charged adsorption of GO-ClO onto nGr / Cu - To obtain Cu / nGr / GO-ClO - film.

3. The method for coating a graphene film covering the bottom of a ship according to claim 1, characterized in that, S2 specifically includes: The prepared Cu / nGr / GO-ClO - The thin film is applied laterally starting from the ridge of the ship, and Cu / nGr / GO-ClO is then applied. - The membrane is bolted to the stainless steel structure of the ship's bottom.

4. The method for coating a graphene film covering the bottom of a ship according to claim 2 or 3, characterized in that, The film undergoes periodic maintenance, the maintenance process including: First to Cu / nGr / GO-ClO - A continuous flow of positive charge causes GO to be adsorbed. However, as seawater washes over the GO, the amount of GO adsorbed gradually decreases. Once the adsorption amount decreases to a certain level, the flow of positive charge to Cu / nGr is stopped, and negative charge is introduced instead. The negative charge repels GO, causing the old GO-ClO adsorbed on Cu / nGr to be released. - It peels off and becomes a Cu / nGr film.

5. The method for coating a graphene film covering the bottom of a ship according to claim 4, characterized in that, The Cu / nGr / GO-ClO - The thin film is updated as follows: Submerge the bottom of the ship until it contains GO-ClO. - In water bodies, Cu / nGr is re-introduced with a positive charge to adsorb GO-ClO. - This will yield a new Cu / nGr / GO-ClO - The structure of GO-ClO is completed. - Update.

6. The method for coating a graphene film covering the bottom of a ship according to claim 2 or 3, characterized in that, When GO-ClO - After complete loss, a negative charge is introduced into the remaining Cu / nGr structure, causing heavy metal ions from seawater to accumulate around the Cu / nGr structure.

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