High-strength marine organism adhesion prevention netting for deep and far sea culture and preparation method

Abstract

The invention relates to the field of deep and far sea culture supplies, and particularly discloses a high-strength marine organism adhesion prevention netting for deep and far sea culture and a preparation method. A high-strength marine organism adhesion prevention netting for deep and far sea culture is characterized in that the netting is made of ultra-high molecular weight polyethylene, the surface of the netting is coated with an antifouling coating, the antifouling coating comprises one of a nano polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer suspension, and the solid content concentration of the suspension is 60-75%; the preparation method comprises the following steps: spraying the antifouling paint on the netting by adopting an electrostatic spraying method, wherein the spraying thickness of the antifouling paint is 50-300 microns; and performing high-temperature shaping on the sprayed netting to obtain the high-strength marine organism adhesion prevention netting for deep and far sea culture. The high-strength marine organism attachment prevention netting for deep and far sea culture has the advantage of reducing netting fouling and damage.

Description

Technical Field

[0001] The present application relates to the field of deep-sea aquaculture supplies, and more specifically, to a high-strength anti-marine organism attachment net for deep-sea aquaculture and a preparation method thereof. Background Art

[0002] Deep-sea aquaculture is an important direction for the transformation and development of marine aquaculture. Realizing large-scale and large-scale production can improve the economic benefits of aquaculture. However, marine biofouling restricts the efficiency and sustainable development of cage aquaculture. This is because the fouling organisms continue to attach to the surface of the nets, causing the mesh of the nets to be blocked, hindering the exchange of nutrients and the removal of waste in the water inside and outside the cages, resulting in eutrophication of the surrounding waters and insufficient oxygen content in the water inside the aquaculture cages. In addition, fouling organisms may also carry diseases, leading to the mass death of farmed fish.

[0003] At present, there are three main methods for anti-fouling aquaculture cages: underwater machine cleaning, anti-fouling paint, and manual net replacement cleaning. Underwater machine cleaning has high requirements for equipment and requires high material costs; in addition, it is easy to cause malfunctions under high sea conditions on offshore islands and reefs, and it is inconvenient to repair, and its large-scale use is limited. Although manual net replacement cleaning has simple equipment requirements, it consumes a lot of manpower and time. At present, anti-fouling paint is the most economical and convenient choice. Conventional anti-fouling coatings, such as cuprous oxide, have good anti-attachment effects in a short period of time, but due to the insufficient adhesion between the coating and the net material, the anti-fouling coating will fall off during long-term use, causing the net to lose its anti-fouling effect, and long-term use will have an adverse effect on the marine water environment. Therefore, there is a need for a deep-sea aquaculture facility net with anti-marine biological attachment function to solve the problem of net fouling in deep-sea aquaculture. Summary of the invention

[0004] In order to solve the problem of net fouling in deep-sea aquaculture, the present application provides a high-strength anti-marine organism attachment net for deep-sea aquaculture and a preparation method thereof.

[0005] The present application provides a high-strength anti-marine organism attachment net for deep-sea aquaculture, which adopts the following technical solution: a high-strength anti-marine organism attachment net for deep-sea aquaculture, the net material is ultra-high molecular weight polyethylene, the surface of the net is coated with an anti-fouling coating, the anti-fouling coating includes one of a nano polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer suspension, and the solid content concentration of the suspension is 60-75%.

[0006] By adopting the above technical solution, ultra-high molecular weight polyethylene is selected as the material of the net, which has extremely high tensile strength and can withstand the large pulling force generated by the flow of seawater in deep-sea aquaculture environments, the weight of aquacultured organisms, and external forces such as the impact of waves that may be encountered, effectively reducing the risk of the net breaking due to force, and ensuring the integrity of aquaculture facilities and the normal progress of aquaculture operations. Due to the extremely small particle size of nano-level polytetrafluoroethylene particles, an extremely smooth coating can be formed on the surface of the net, reducing the wear of the coating caused by friction and extending the service life of the coating. In addition, the attachment of marine organisms usually requires a certain degree of roughness or a microstructure for attachment, and the nano-polytetrafluoroethylene coating greatly reduces such attachment conditions, thereby effectively inhibiting the growth and attachment of various marine organisms such as algae and barnacles on the surface of the net, and significantly reducing the possibility of net contamination. Polytetrafluoroethylene itself has the characteristics of low surface energy, which makes it highly repellent to substances such as water and mucus secreted by marine organisms. The nano-polytetrafluoroethylene coating further strengthens this repulsive effect, making it difficult for substances secreted by marine organisms to stay on the surface of the coating, thereby preventing them from further attaching and growing. Polytetrafluoroethylene-hexafluoropropylene copolymer has good flexibility, which enables the net coated with this copolymer to better adapt to the deformation requirements caused by the flow of seawater, the impact of waves, and the activities of farmed organisms in deep-sea aquaculture environments. Compared with some coatings with strong rigidity, it will not crack or fall off due to the frequent deformation of the net, ensuring the close combination of the coating and the net and the continuous effectiveness of the anti-fouling function. Similar to polytetrafluoroethylene, this copolymer also has the characteristics of low surface energy, which can effectively repel marine organisms and their secreted mucus and other substances, making it difficult for marine organisms to attach and grow on the surface of the net.

[0007] Optionally, the antifouling coating comprises a mixed suspension containing nano-polytetrafluoroethylene and polytetrafluoroethylene-hexafluoropropylene copolymer, and the solid content concentration of the mixed suspension is 60-70%.

[0008] By adopting the above technical solution, when the solid content concentration is 60-70%, the nano-polytetrafluoroethylene and polytetrafluoroethylene-hexafluoropropylene copolymer in the mixed suspension can form a coating of suitable thickness and uniformity, avoiding the problems of poor antifouling effect caused by too thin coating or drying and cracking caused by too thick coating. When facing external forces such as seawater scouring, wave impact and friction of farmed organisms, it can better maintain its integrity and reduce the risk of coating damage and shedding, thereby ensuring the durability of the antifouling function. At the same time, nano-polytetrafluoroethylene has the effect of enhancing the wear resistance of the coating. Combined with the flexibility of polytetrafluoroethylene-hexafluoropropylene copolymer, the coating can effectively resist wear while maintaining flexibility when facing external forces such as seawater scouring and friction of marine organisms, extending the service life of the coating, thereby ensuring that the antifouling effect of the net can be continuously exerted.

[0009] Optionally, the nano polytetrafluoroethylene and the polytetrafluoroethylene-hexafluoropropylene copolymer are mixed in a mass ratio of 1:(1-3).

[0010] By adopting the above technical solution, nano-PTFE and PTFE-HEPA copolymer are mixed in a mass ratio of 1:(1-3), which can form a smooth, low-energy coating on the surface of the net, effectively enhance the anti-fouling performance, inhibit the attachment of marine organisms and the formation of biofilms, and at the same time improve the adhesion of the coating to the net, achieve a balance between the flexibility and hardness of the coating, and significantly improve the wear resistance, ensuring a long-lasting and effective anti-fouling function in deep-sea aquaculture environments.

[0011] Optionally, the molecular weight of the ultra-high molecular weight polyethylene is 3 million to 5 million.

[0012] By adopting the above technical solutions, in deep-sea aquaculture environments, nets need to withstand huge tensile forces and wear resistance, including the flow of seawater, the deadweight of aquacultured organisms, and long-term friction. Ultra-high molecular weight polyethylene with a molecular weight of 3 million to 5 million can effectively resist these tensile forces and wear, and prevent the net from breaking or deforming. In addition, seawater contains a variety of salts, microorganisms and other components, which can corrode the net material. Ultra-high molecular weight polyethylene with a molecular weight between 3 million and 5 million is selected. Its tight molecular chain structure makes it more difficult for chemical substances to penetrate into the material. This ensures that the net will not be damaged by chemical corrosion during long-term contact with seawater, thereby maintaining the physical properties and service life of the net.

[0013] In a second aspect, the present application provides a method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture, which adopts the following technical solution: A method for preparing a high-strength marine organism-proof net for deep-sea aquaculture, comprising the following steps: The antifouling coating is sprayed on the net by electrostatic spraying, and the thickness of the antifouling coating is 50-300μm; The sprayed net is subjected to high temperature shaping to produce a high-strength marine life-preventing net for deep-sea aquaculture.

[0014] By adopting the above technical solution, during the electrostatic spraying process, the paint particles will carry the same charge. Since charges of the same kind repel each other, the paint particles will be evenly dispersed and fly to the surface of the net under the action of the electric field force, achieving uniform coverage of the paint on all parts of the net. The process of charged paint particles hitting the surface of the net at high speed will make the paint particles better embedded in the surface of the net, forming a tighter bond, reducing the risk of paint falling off due to insufficient adhesion during subsequent use, thereby ensuring the durability of the anti-fouling effect. After high-temperature shaping, the anti-fouling paint will undergo a curing reaction on the surface of the net. The cured coating has higher hardness and wear resistance, and can better resist damage to the coating caused by external forces such as seawater scouring and friction of marine organisms, thereby extending the service life of the coating.

[0015] Optionally, the net is further subjected to plasma surface treatment before spraying the antifouling coating, and the method of the plasma surface treatment is: The net is placed in a plasma device and evacuated to a vacuum level of 20-40 Pa. A mixed gas of 55-65% oxygen and 35-45% argon is used for plasma treatment for 60-90 seconds.

[0016] By adopting the above technical solution, oxygen will produce active particles such as oxygen ions and oxygen free radicals in the plasma state. These active particles react with the ultra-high molecular weight polyethylene molecules on the surface of the net, and can introduce a large number of oxygen-containing functional groups, such as hydroxyl and carboxyl groups, on the surface of the net. The introduction of hydroxyl and carboxyl groups significantly improves the hydrophilicity and chemical reactivity of the net surface, allowing the subsequent sprayed antifouling paint to form a tighter bond with the net surface, thereby greatly enhancing the adhesion of the paint to the net. Argon ions have high energy. When they hit the surface of the net, they will remove some weak layers and pollutants on the surface, making the surface rough and providing more attachment sites for the antifouling paint. After the paint is sprayed onto the rough surface of the net, it can better form a mechanical bite, further enhancing the bonding between the paint and the net.

[0017] Optionally, the temperature of the high-temperature setting is 250-350° C., and the time of the high-temperature setting is 1-5 min.

[0018] By adopting the above technical solution, under the condition of 250-350°C, the structure of the antifouling coating is more stable, and can effectively resist coating aging caused by environmental factors such as ultraviolet radiation and seawater chemical corrosion.

[0019] Optionally, the antifouling coating is sprayed to a thickness of 150-200 μm.

[0020] By adopting the above technical solution, when the spraying thickness is too low, the antifouling coating is easy to fall off after wear, so that the antifouling effect is reduced, and when the spraying thickness is too high, it is easy to cause deformation and cracking problems, thereby causing the antifouling coating to peel off during use, which will also reduce the antifouling effect. When the spraying thickness is 150-200μm, the above deficiencies can be balanced, so that the antifouling coating can maintain a good antifouling effect in long-term use.

[0021] In summary, this application has the following beneficial effects: 1. Since the net of the present application is made of ultra-high molecular weight polyethylene, it has ultra-high tensile strength to resist various external forces, reduce the risk of rupture, and protect aquaculture facilities and operations; the anti-fouling coating coated on its surface, whether it is a nano-polytetrafluoroethylene suspension or a polytetrafluoroethylene-hexafluoropropylene copolymer suspension, the former forms a smooth and wear-resistant coating with nano-scale particles, reduces the conditions for the attachment and wear of marine organisms, and enhances the low surface energy to repel mucus. The latter adapts to the deformation of the net with good flexibility. Both of them effectively repel marine organisms and their secretions due to their low surface energy characteristics, inhibit the attachment and growth of organisms, and significantly reduce the possibility of net fouling, ensuring that the coating is closely combined with the net and the anti-fouling function is continuously effective.

[0022] 2. In the present application, the preferred antifouling coating is a mixed suspension containing nano-polytetrafluoroethylene and polytetrafluoroethylene-hexafluoropropylene copolymer, with a solid content of 60-70% and a mass ratio of 1:(1-3), which can form a coating of suitable and uniform thickness, effectively avoid the problems caused by too thin or too thick coating, enhance the ability to resist external forces, reduce the risk of damage and falling off, and ensure the durability of antifouling; nano-polytetrafluoroethylene enhances wear resistance and cooperates with the flexibility of the copolymer to extend the life of the coating; the specific mass ratio makes the coating have both smooth and low-energy characteristics, improves antifouling performance, inhibits biological attachment and biofilm formation, improves adhesion, balances flexibility and hardness, and can continuously and stably play an antifouling role in deep-sea aquaculture environments.

[0023] 3. The method of the present application firstly adopts an electrostatic spraying method to evenly spray the antifouling coating on the net, and utilizes the repulsion of like charges to evenly disperse the coating particles to cover all parts of the net, and enhances the bonding force between the coating and the net by the high-speed impact of the charged particles on the surface of the net, thereby reducing the risk of coating shedding to ensure the durability of antifouling; and then undergoes high-temperature setting to promote the curing of the antifouling coating on the surface of the net. The hardness and wear resistance of the cured coating are improved, and it can effectively resist external forces such as seawater scouring and friction of marine organisms, thereby extending the service life of the coating, and overall ensuring the good antifouling and durability of the net in deep-sea aquaculture environments. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the experiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources. Example

[0025] Example 1 A method for preparing a high-strength marine organism-proof net for deep-sea aquaculture: Using ultra-high molecular weight polyethylene with a molecular weight of 3 million to 5 million as raw material, polyethylene fibers are obtained by heating and extrusion, and then the polyethylene fibers are woven into nets; Nano-polytetrafluoroethylene (purity greater than 98%) was mixed with deionized water and stirred at a high speed of 2000 r / min to form a suspension with a solid content concentration of 70%; Use the suspension as the antifouling coating, add the prepared antifouling coating into the feeding system of the electrostatic spraying equipment, hang the net flatly in the spraying work area, start the electrostatic spraying equipment, and control the spraying thickness at 175±25μm; The sprayed net was transferred to a heating box and fixed at 300°C for 3 minutes. After the net was fixed, it was placed in a well-ventilated and dry environment to naturally cool to room temperature, thereby obtaining a high-strength anti-marine organism attachment net for deep-sea aquaculture.

[0026] Example 2 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the solid content concentration of the suspension is 60%.

[0027] Example 3 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the solid content concentration of the suspension is 75%.

[0028] Example 4 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 1 is that a polytetrafluoroethylene-hexafluoropropylene copolymer (with a purity greater than 98%) is mixed with deionized water and stirred at a high speed of 2000 r / min to form a suspension with a solid content concentration of 70%.

[0029] Example 5 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that a nano-polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer are evenly mixed in a mass ratio of 1:2, and the mixture is then mixed with deionized water and stirred at a high speed of 2000r / min to form a suspension with a solid content concentration of 70%.

[0030] Example 6 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 5 is that the nano-polytetrafluoroethylene suspension and the polytetrafluoroethylene-hexafluoropropylene copolymer are evenly mixed in a mass ratio of 1:1.

[0031] Example 7 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 5 is that the nano-polytetrafluoroethylene suspension and the polytetrafluoroethylene-hexafluoropropylene copolymer are evenly mixed in a mass ratio of 1:3.

[0032] Example 8 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 5 is that a nano-polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer are evenly mixed in a mass ratio of 1:2, and the mixture is then mixed with deionized water and stirred at a high speed of 2000r / min to form a mixed suspension with a solid content concentration of 60%.

[0033] Example 9 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 5 is that a nano-polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer are evenly mixed in a mass ratio of 1:2, and the mixture is then mixed with deionized water and stirred at a high speed of 2000r / min to form a mixed suspension with a solid content concentration of 65%.

[0034] Example 10 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 1 is that the molecular weight of the ultra-high molecular weight polyethylene is 1-3 million.

[0035] Embodiment 11 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 1 is that the molecular weight of the ultra-high molecular weight polyethylene is 5-7 million.

[0036] Example 12 A method for preparing a high-strength marine organism-proof net for deep-sea aquaculture: Ultra-high molecular weight polyethylene with a molecular weight of 3 million to 5 million is used as a raw material, polyethylene fibers are obtained by heating and extrusion, and then the polyethylene fibers are woven into a net, and the net is placed in a treatment chamber of a plasma device, and the treatment chamber is evacuated to a vacuum degree of 30Pa, and a mixed gas of 60% oxygen and 40% argon is selected, and the total flow rate is set at 120sccm. The plasma equipment is set to a power of 300W, a discharge voltage of 2kv, and a plasma source 15cm away from the net, and the plasma treatment is performed for 80s; Nano-polytetrafluoroethylene (purity greater than 98%) was mixed with deionized water and stirred at a high speed of 2000 r / min to form a suspension with a solid content concentration of 70%; Using the suspension as the antifouling coating, add the prepared antifouling coating into the feeding system of the electrostatic spraying equipment, hang the net flatly in the spraying work area, start the electrostatic spraying equipment, and control the spraying thickness between 50-300μm; The sprayed net was transferred to a heating box and fixed at 300°C for 3 minutes. After the net was fixed, it was placed in a well-ventilated and dry environment to naturally cool to room temperature, thereby obtaining a high-strength anti-marine organism attachment net for deep-sea aquaculture.

[0037] Example 13 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 12 is that a mixed gas of 55% oxygen and 45% argon is used for plasma treatment.

[0038] Embodiment 14 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 12 is that a mixed gas of 65% oxygen and 35% argon is used for plasma treatment.

[0039] Embodiment 15 A method for preparing a high-strength marine life-preventing net for deep-sea aquaculture: the difference from Example 1 is that the high-temperature setting temperature is 250°C.

[0040] Example 16 A method for preparing a high-strength marine life-preventing net for deep-sea aquaculture: the difference from Example 1 is that the high-temperature setting temperature is 350°C.

[0041] Embodiment 17 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the spraying thickness of the antifouling coating is 75±25 μm.

[0042] Embodiment 18 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the spraying thickness of the antifouling coating is 275±25 μm.

[0043] Comparative Example Comparative Example 1 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the solid content concentration of the suspension is 55%.

[0044] Comparative Example 2 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the solid content concentration of the suspension is 80%.

[0045] Comparative Example 3 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: the difference from Example 1 is that the antifouling coating uses a cuprous oxide suspension.

[0046] Comparative Example 4 A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture: The difference from Example 1 is that the antifouling coating is sprayed on the net by roller coating.

[0047] Performance testing Detection Methods The nets prepared in the embodiment and the comparative example were cut into the same area, placed in the same marine aquaculture area, fixed on the aquaculture facilities, and taken out and dried and weighed at the 3rd and 6th months respectively. The weight change of the nets in the dry state reflects the ability of preventing marine organisms from attaching, and the nets were observed to see if they were damaged or broken.

[0048] Table 1 Test results It can be seen from Examples 1-3 and Comparative Examples 1-2 and Table 1 that when the solid content is in the range of 60-75%, the suspension can form a coating of suitable thickness and uniformity on the surface of the net. When it is coated on an ultra-high molecular weight polyethylene net, it can well cover the microstructure of the surface of the net and provide effective protection for the net. When the solid content is lower than 60%, the coating formed may be too thin. This will result in the inability to effectively cover the microstructure of the surface of the net, providing convenient conditions for the attachment of marine organisms. Marine organisms such as algae and barnacles can more easily find attachment points on the surface of the net, resulting in net contamination. Too high a solid content will increase the viscosity of the suspension, which will bring difficulties to the coating process. When using methods such as electrostatic spraying, the coating will not be easy to disperse and the spraying will be uneven, resulting in a decrease in the quality of the coating on the surface of the net, affecting the uniformity of the anti-fouling effect. Thicker coatings will face many problems during the drying and curing process after spraying. The internal solvent is difficult to evaporate completely, which can easily lead to defects such as bubbles and hollows in the coating.

[0049] It can be seen from Example 1 and Comparative Examples 3-4 and Table 1 that polytetrafluoroethylene and its copolymers have extremely low surface energy, making it difficult for marine organisms to attach and grow on their surfaces, thereby providing long-lasting antifouling performance. The antifouling effect of cuprous oxide suspension mainly depends on the release of copper ions to kill marine organisms, but with the passage of time and the consumption of copper ions, the antifouling effect will gradually weaken. The physical properties of cuprous oxide coatings are relatively poor. Under the action of external forces such as long-term seawater scouring and net deformation, problems such as wear and tear and shedding are prone to occur, resulting in the destruction of the integrity of the antifouling coating, thereby affecting the antifouling effect. Electrostatic spraying uses the principle of electrostatic attraction to make the atomized coating negatively charged under the action of a high-voltage DC electric field, and adsorbed on the surface of a positively charged substrate to discharge to form a coating. The coating particles move in a directional manner along the direction of the electric field, and there is basically no rebound and scattering. Roller coating is the transfer of the coating to the surface of the object to be coated in the form of a wet film on the surface of the roller. During the process, some of the coating will remain on the roller, and for objects with complex shapes or depressions, roller coating is difficult to evenly apply the coating, and the coating utilization rate is relatively lower than that of electrostatic spraying. Electrostatic spraying can form a flat and smooth coating on the surface of the net, so that the coating can better adhere to the fiber surface and gaps of the net, enhance the bonding strength between the coating and the net, and improve the durability and reliability of the antifouling coating. Although roller coating can also achieve a relatively uniform coating, for objects such as nets that have a certain degree of flexibility and complex surface structure, roller coating may cause uneven coating thickness due to the uneven surface of the net, resulting in local over-thickness or over-thinness, affecting the antifouling effect and the service life of the coating.

[0050] It can be seen from Examples 1-9 and Table 1 that, when the solid content concentration is 60-70%, the coating formed by the mixed suspension of nano polytetrafluoroethylene and polytetrafluoroethylene-hexafluoropropylene copolymer has many advantages. Its thickness is appropriate and uniform, which can not only improve the antifouling effect and avoid various problems caused by too thin or too thick coating, but also maintain integrity and reduce the risk of damage and falling off in the face of external forces such as seawater scouring, wave impact and friction of aquaculture organisms to ensure the durability of the antifouling function. At the same time, the wear resistance of nano polytetrafluoroethylene is combined with the flexibility of polytetrafluoroethylene-hexafluoropropylene copolymer, so that the coating can effectively resist wear while maintaining flexibility, extend the service life, and ensure that the antifouling effect of the net continues to be exerted. Nano-PTFE and PTFE-HEX copolymer are mixed in a mass ratio of 1:(1-3) to form a smooth, low-energy coating on the surface of the net, effectively enhancing the anti-fouling performance, inhibiting the attachment of marine organisms and the formation of biofilms, while improving the adhesion of the coating to the net, achieving a balance between the flexibility and hardness of the coating, and significantly improving the wear resistance, ensuring a long-lasting and effective anti-fouling function in deep-sea aquaculture environments.

[0051] It can be seen from Examples 1, 10, 11 and Table 1 that ultra-high molecular weight polyethylene with a molecular weight of 3 million to 5 million can effectively resist these tensile forces and wear, and prevent the net from breaking or deforming. In addition, seawater contains a variety of salts, microorganisms and other components, which can corrode the net material. Ultra-high molecular weight polyethylene with a molecular weight of 3 million to 5 million is selected, and its tight molecular chain structure makes it more difficult for chemical substances to penetrate into the material, which ensures that the net will not be damaged due to chemical corrosion during long-term contact with seawater, and maintains the physical properties and service life of the net.

[0052] It can be seen from Examples 1, 12-14 and Table 1 that active particles such as oxygen ions and oxygen free radicals generated when oxygen is in a plasma state react with ultra-high molecular weight polyethylene molecules on the surface of the net, introducing oxygen-containing functional groups such as hydroxyl and carboxyl, thereby improving the hydrophilicity and chemical reaction activity of the net surface and enhancing the adhesion of the subsequent sprayed antifouling coating to the net; at the same time, argon ions impact the surface of the net with higher energy, remove weak layers and pollutants to make it rough, provide more attachment sites for the antifouling coating, and further enhance the bonding between the coating and the net by forming a mechanical bite.

[0053] It can be seen from Examples 1, 15-18 and Table 1 that under the condition of 250-350°C, the structure of the antifouling coating is more stable and can effectively resist coating aging caused by environmental factors such as ultraviolet radiation and seawater chemical corrosion. When the spraying thickness is 150-200 μm, the above deficiencies can be balanced, so that the antifouling coating can maintain a good antifouling effect in long-term use.

[0054] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high-strength anti-marine organism attachment net for deep-sea aquaculture, characterized in that: The net is made of ultra-high molecular weight polyethylene, and the surface of the net is coated with an antifouling coating, which includes one of a nano polytetrafluoroethylene suspension and a polytetrafluoroethylene-hexafluoropropylene copolymer suspension, and the solid content concentration of the suspension is 60-75%.

2. The high-strength marine organism-proof net for deep-sea aquaculture according to claim 1, characterized in that: The antifouling coating comprises a mixed suspension of nano polytetrafluoroethylene and polytetrafluoroethylene-hexafluoropropylene copolymer, and the solid content concentration of the mixed suspension is 60-70%.

3. The high-strength marine organism-proof net for deep-sea aquaculture according to claim 2, characterized in that: The nano polytetrafluoroethylene and the polytetrafluoroethylene-hexafluoropropylene copolymer are mixed in a mass ratio of 1:(1-3).

4. The high-strength marine organism-proof net for deep-sea aquaculture according to claim 1, characterized in that: The molecular weight of the ultra-high molecular weight polyethylene is 3 million to 5 million.

5. A method for preparing a high-strength anti-marine organism attachment net for deep-sea aquaculture according to any one of claims 1 to 4, characterized in that: The following steps are involved: The antifouling coating is sprayed on the net by electrostatic spraying, and the thickness of the antifouling coating is 50-300μm; The sprayed net is subjected to high temperature shaping to produce a high-strength marine life-preventing net for deep-sea aquaculture.

6. The method for preparing a high-strength marine organism-proof net for deep-sea aquaculture according to claim 5, characterized in that: The net is also subjected to plasma surface treatment before spraying the antifouling coating, and the method of the plasma surface treatment is as follows: The net is placed in a plasma device and evacuated to a vacuum degree of 20-40 Pa. A mixed gas of 55-65% oxygen and 35-45% argon is used for plasma treatment for 60-90 seconds.

7. The method for preparing a high-strength marine organism-proof net for deep-sea aquaculture according to claim 5, characterized in that: The temperature of the high temperature setting is 250-350° C., and the time of the high temperature setting is 1-5 minutes.

8. The high-strength marine organism-proof net for deep-sea aquaculture according to claim 5, characterized in that: The antifouling coating has a spraying thickness of 150-200 μm.

Images