Post-treatment method of high-strength marine organism adhesion prevention braided wire for deep and far sea culture

Abstract

The invention relates to the field of fishing nettings, and particularly discloses a post-processing method of a high-strength marine organism adhesion prevention braided wire for deep and far sea culture. The post-processing method of the high-strength marine organism adhesion prevention braided wire for deep and far sea culture comprises the following steps: twisting ultra-high molecular weight polyethylene fibers into a wire serving as a core wire of the braided wire; twisting the polytetrafluoroethylene film split fiber to serve as a rubber-covered wire of the braided wire; processing the core wire and the rubber-covered wire through a braiding machine to obtain a braided wire semi-finished product; immersing the braided wire semi-finished product into a polytetrafluoroethylene suspension for immersion treatment; and performing high-temperature setting on the braided wire subjected to dipping treatment to obtain the marine organism adhesion prevention braided wire for fishing. The post-processing method of the high-strength braided wire for preventing marine organism adhesion for deep sea culture has the advantage of solving the problem of netting fouling in deep sea culture.

Description

Technical Field

[0001] The present application relates to the field of fishing nets, and more specifically, to a post-processing method for a high-strength marine organism-resistant braided line for deep-sea aquaculture. Background Art

[0002] With the acceleration of the development of marine resources, deep-sea aquaculture has become the core direction of the transformation and development of my country's marine aquaculture, and is rapidly advancing towards large-scale and large-scale development. This trend has extremely critical strategic value in improving the economic benefits of aquaculture and stabilizing the supply of aquatic products.

[0003] However, deep-sea aquaculture has encountered serious problems of marine biofouling in its actual development, which has become a key bottleneck restricting the efficient and sustainable development of cage aquaculture. There are extremely rich and diverse biological species in the marine environment, such as algae, shellfish, barnacles and other fouling organisms. These organisms are naturally endowed with strong attachment characteristics and will continue to attach and multiply on the surface of the cage net. With the continuous accumulation of fouling organisms, the mesh of the net will gradually be blocked. This situation directly interferes with the normal exchange process of nutrients between the water inside and outside the cage, making it difficult for the cultured organisms in the cage to obtain sufficient nutrients, thereby hindering their normal growth and development.

[0004] Traditional solutions to the problem of marine biofouling mainly include regular manual cleaning of nets and the use of chemical antifouling coatings. Manual cleaning of nets not only requires a lot of manpower, material resources and time costs, but also significantly increases the difficulty of operation in the special environment of the deep sea, making it difficult to ensure frequent cleaning operations. Although chemical antifouling coatings can inhibit the attachment of organisms to a certain extent, the harmful substances contained in them pose a risk of leakage. Once leaked, they will pollute the marine environment and disrupt the original balance of the marine ecosystem. In the context of the continuous improvement of environmental protection requirements, the application of chemical antifouling coatings has been subject to increasingly stringent restrictions.

[0005] Therefore, there is a need to develop a polytetrafluoroethylene braided fishing line with the function of preventing marine organisms from attaching to fish, so as to solve the problem of net fouling in deep-sea aquaculture. Summary of the invention

[0006] In order to solve the problem of net fouling in deep-sea aquaculture, the present application provides a post-processing method for high-strength anti-marine organism attachment braided wire for deep-sea aquaculture.

[0007] The present application provides a post-processing method for a high-strength marine organism-proof braided wire for deep-sea aquaculture using the following technical solution: A post-processing method for a high-strength marine organism-proof braided line for deep-sea aquaculture comprises the following steps: The ultra-high molecular weight polyethylene fibers are twisted into threads to serve as the core of the braided thread; Twisting the polytetrafluoroethylene film split fibers to make the skin wire of the braided wire; Processing the core wire and the skin wire through a braiding machine to obtain a braided wire semi-finished product; The semi-finished braided wire is immersed in a polytetrafluoroethylene suspension for dipping treatment; The braided line after impregnation treatment is shaped at high temperature to obtain a fishing braided line that prevents marine organisms from attaching.

[0008] By adopting the above technical solution, polytetrafluoroethylene has extremely low surface energy, and whether it is used as a braided wire skin or a coating formed by dipping, it can make the surface of the braided wire extremely hydrophobic and non-sticky. Marine organisms such as algae, shellfish, barnacles, etc. find it difficult to form stable attachment points on such a low surface energy surface during the attachment process, greatly reducing the possibility of their initial attachment.

[0009] Optionally, the braided wire semi-finished product needs to be subjected to laser pulse treatment before the impregnation treatment.

[0010] By adopting the above technical solution, laser pulse treatment is performed before the impregnation treatment, which can form specific micro-nano structures on the surface of the braided wire semi-finished product. These micro-nano structures can change the physical and chemical properties of the surface, increase the complexity of the surface roughness at the microscopic scale, and further reduce the possibility of marine organisms attaching. Compared with the braided wire that has not been treated with laser pulses, it effectively extends the cleaning and use cycle of the braided wire in the marine environment and reduces the problem of cage performance degradation caused by biological fouling.

[0011] Optionally, the laser pulse treatment is performed at a wavelength of 1064 nm, a pulse width of 30 ns, and a frequency of 120 Hz.

[0012] By adopting the above technical solution, a wavelength of 1064nm is used, which can be well absorbed by the braided wire material, so that the energy can effectively act on the surface of the material; the 30ns pulse width can accurately control the melting and recasting process of the surface material without destroying the main structure of the material to form an ideal micro-nano structure; the 120Hz frequency ensures the uniformity and efficiency of the treatment, so that every part of the braided wire surface can be properly treated, thereby steadily improving the braided wire's anti-marine organism attachment performance and controlling the loss of mechanical properties of the treated braided wire within a very small range.

[0013] Optionally, the concentration of the polytetrafluoroethylene suspension is 60%-75%.

[0014] By adopting the above technical solution, when the concentration of polytetrafluoroethylene suspension is between 60% and 75%, a coating with moderate thickness, uniformity and density can be formed on the surface of the braided wire. Too high a concentration may result in a coating that is too thick, prone to cracking, shedding and other problems, affecting the antifouling effect and the flexibility of the braided wire; too low a concentration may result in a coating that is too thin and cannot provide sufficient antifouling protection and durability.

[0015] Optionally, the braided wire is immersed in the polytetrafluoroethylene suspension for 20-40 minutes.

[0016] By adopting the above technical solution, the immersion time of 20-40 minutes can make the braided wire fully absorb the polytetrafluoroethylene suspension, ensuring that the coating completely covers the surface of the braided wire and penetrates to a certain depth to form a good combination with the braided wire material.

[0017] Optionally, the polytetrafluoroethylene suspension is a nanoscale aqueous polytetrafluoroethylene suspension.

[0018] By adopting the above technical solution, nano-scale water-based polytetrafluoroethylene suspension is used. The nano-scale particle size enables it to be more evenly dispersed in the solution, and it is easier to penetrate into the fine structure of the braided wire during the impregnation process, forming a denser, more uniform and smoother coating. The water-based system is environmentally friendly and pollution-free, meets the requirements of sustainable development of marine aquaculture, and avoids the potential harm of traditional organic solvent-based coatings to the marine environment.

[0019] Optionally, the high temperature setting temperature is 300-350° C. and the time is 15-30 minutes.

[0020] By adopting the above technical solution, the high temperature setting temperature of 300-350℃ and the time of 15-30 minutes can fully melt and solidify the polytetrafluoroethylene coating, eliminate the pores and defects in the coating, and improve the density and hardness of the coating. This not only enhances the antifouling performance of the coating, making it more difficult for marine organisms to attach and erode, but also makes the bond between the coating and the braided wire more firm, improving the overall strength and wear resistance of the braided wire.

[0021] Optionally, the high temperature setting adopts microwave curing with a power of 2-5 kW and a frequency of 2.45 GHz.

[0022] By adopting the above technical solution, microwave curing with a power of 2-5kW and a frequency of 2.45GHz is used for high-temperature shaping. Microwaves can make the polar molecules inside the polytetrafluoroethylene coating vibrate quickly and generate heat through friction, achieving rapid and uniform curing. Compared with traditional heat conduction heating methods, the microwave curing speed can be increased by 3-5 times, greatly shortening the production cycle and saving energy by about 40%-60%. Moreover, the uniformity of the microwave field can ensure that the coating on the entire surface of the braided wire has a consistent curing effect, avoiding the problem of local overheating or insufficient curing, making the performance of the braided wire more stable and reliable, effectively reducing the product quality differences caused by uneven curing, and improving the product qualification rate and stability.

[0023] In summary, this application has the following beneficial effects: 1. Since the present application uses ultra-high molecular weight polyethylene fiber as the core wire to give the braided wire high-strength support, it can withstand various mechanical stresses in deep sea environments. At the same time, the various processing links of the braided wire, such as reasonable immersion time to ensure good bonding between the coating and the braided wire, high-temperature shaping to improve the bonding firmness between the coating and the braided wire and the overall strength and wear resistance, etc., enable the braided wire to maintain and enhance its mechanical properties while having anti-fouling capabilities, and improve its stability in seawater environments, including resistance to seawater corrosion and aging, which prolongs the service life of the braided wire.

[0024] 2. In this application, it is preferred to use multiple treatment methods in synergy, laser pulse treatment to optimize the surface microstructure of the braided wire, use a specific concentration and nano-level aqueous polytetrafluoroethylene suspension for immersion treatment to form a uniform and dense coating, and high-temperature shaping to further enhance the coating performance, which significantly reduces the possibility of marine organisms attaching to the braided wire. The overall anti-fouling performance is greatly improved, which can effectively extend the clean use cycle of the braided wire in the marine environment and reduce the adverse effects of biological fouling on cage aquaculture.

[0025] 3. The method of the present application, by using a nano-scale aqueous polytetrafluoroethylene suspension, not only meets the requirements of environmental protection and pollution-free, avoids harm to the marine environment, but also forms a higher quality coating by virtue of its nano characteristics. In addition, the use of microwave curing for high-temperature shaping achieves high efficiency and energy saving, shortens the production cycle, improves product qualification rate and stability, and takes into account the efficiency and sustainability of production while ensuring product quality. DETAILED DESCRIPTION

[0026] 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

[0027] Example 1 A post-processing method for high-strength marine organism-proof braided wire for deep-sea aquaculture: Select ultra-high molecular weight polyethylene fiber with a molecular weight of 4 million and a linear density of 2000D. Place the ultra-high molecular weight polyethylene fiber bundle on the creel of the twisting device, adjust the parameters of the twisting device, and set the twist to 25 twists / m. Turn on the twisting device to twist the fiber in the twisting device according to the set twist.

[0028] A polytetrafluoroethylene fiber with a linear density of 650D is selected. The polytetrafluoroethylene fiber is made by a film splitting method and is placed on a yarn rack of another twisting device. The twist of the twisting device is adjusted to 40 twists / m, and the twisting device is started to perform a twisting operation on the polytetrafluoroethylene fiber.

[0029] Install the bobbins with the ultra-high molecular weight polyethylene core wire and the polytetrafluoroethylene sheath wire on the corresponding positions of the braiding machine, start the braiding machine, and use the twill braiding method to braid the sheath wire on the outer surface of the core wire. After the braiding is completed, remove the braided wire semi-finished product from the braiding machine.

[0030] The semi-finished braided wire is immersed in a polytetrafluoroethylene suspension for dipping treatment, the concentration of the polytetrafluoroethylene suspension is 65%, the dipping time is 30 minutes, and the polytetrafluoroethylene particle size is 10-50 microns; The braided line after the impregnation treatment is subjected to high-temperature shaping by microwave heating at 330°C, and is cured by microwaves with a power of 4kW and a frequency of 2.45GHz for 20 minutes to obtain a fishing braided line that is resistant to the attachment of marine organisms.

[0031] Example 2 A post-treatment method for high-strength marine organism-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that the concentration of the polytetrafluoroethylene suspension is 60%.

[0032] Example 3 A post-treatment method for high-strength marine organism-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that the concentration of the polytetrafluoroethylene suspension is 75%.

[0033] Example 4 A post-treatment method for a high-strength marine life-proof braided line for deep-sea aquaculture: The difference from Example 1 is that the braided line is immersed in the polytetrafluoroethylene suspension for 20 minutes.

[0034] Example 5 A post-treatment method for a high-strength marine life-proof braided line for deep-sea aquaculture: The difference from Example 1 is that the braided line is immersed in the polytetrafluoroethylene suspension for 40 minutes.

[0035] Example 6 A post-processing method for high-strength marine life-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that the particle size of the polytetrafluoroethylene is 10-50nm.

[0036] Example 7 A post-processing method for high-strength marine life-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that high-temperature shaping is performed by heating and curing with a heat pipe in a heating furnace.

[0037] Example 8 A post-processing method for high-strength marine organism-proof braided wire for deep-sea aquaculture: Select ultra-high molecular weight polyethylene fiber with a molecular weight of 4 million and a linear density of 2000D. Place the ultra-high molecular weight polyethylene fiber bundle on the creel of the twisting device, adjust the parameters of the twisting device, and set the twist to 25 twists / m. Turn on the twisting device to twist the fiber in the twisting device according to the set twist.

[0038] A polytetrafluoroethylene fiber with a linear density of 650D is selected. The polytetrafluoroethylene fiber is made by a film splitting method and is placed on a yarn rack of another twisting device. The twist of the twisting device is adjusted to 40 twists / m, and the twisting device is started to perform a twisting operation on the polytetrafluoroethylene fiber.

[0039] Install the bobbins with the ultra-high molecular weight polyethylene core wire and the polytetrafluoroethylene sheath wire on the corresponding positions of the braiding machine, start the braiding machine, and use the twill braiding method to braid the sheath wire on the outer surface of the core wire. After the braiding is completed, remove the braided wire semi-finished product from the braiding machine.

[0040] The surface of the braided wire semi-finished product was treated by using a 1064nm Nd:YAG laser with a pulse width of 30ns and a frequency of 120hz, with an energy density of 8.5J / cm 2 , spot diameter 0.5mm; The semi-finished braided wire is immersed in a polytetrafluoroethylene suspension for dipping treatment, the concentration of the polytetrafluoroethylene suspension is 65%, the dipping time is 30 minutes, and the polytetrafluoroethylene particle size is 10-50 microns; The braided line after the impregnation treatment is subjected to high-temperature shaping by microwave heating at 330°C, and is cured by microwaves with a power of 4kW and a frequency of 2.45GHz for 20 minutes to obtain a fishing braided line that is resistant to the attachment of marine organisms.

[0041] Comparative Example Comparative Example 1 A post-treatment method for high-strength marine life-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that no immersion treatment is performed.

[0042] Comparative Example 2 A post-treatment method for high-strength marine organism-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that the concentration of the polytetrafluoroethylene suspension is 50%.

[0043] Comparative Example 3 A post-treatment method for high-strength marine organism-proof braided wire for deep-sea aquaculture: The difference from Example 1 is that the concentration of the polytetrafluoroethylene suspension is 85%.

[0044] Performance testing Detection method / test method The braided wires obtained in the embodiment and the comparative example were respectively woven into nets of the same specification and effective area, placed in the same marine aquaculture area, fixed on the aquaculture facilities, taken out and dried and weighed at the 3rd and 6th months respectively, and the weight change of the nets in the dry state reflected the ability to prevent the attachment of marine organisms, and the nets were observed to see whether they were damaged or broken.

[0045] Table 1 Combining Example 1 and Comparative Examples 1-3 and Table 1, it can be seen that Example 1 was treated with a polytetrafluoroethylene suspension immersion treatment, while Comparative Example 1 was not treated. In the anti-fouling test in the marine environment, the amount of biological attachment on the surface of the braided wire of Example 1 was significantly lower than that of Comparative Example 1, which shows that the immersion treatment of Example 1 can effectively form an anti-fouling coating, greatly reduce the degree of attachment of marine organisms, and ensure the exchange of water inside and outside the cage and the living environment of farmed organisms. The concentration of polytetrafluoroethylene suspension in Comparative Example 2 is 50%, which is not within the range of 60-75% of the present application. After the same 3-6 months of marine environment testing, the amount of biological attachment on the surface of the braided wire of Comparative Example 2 was significantly higher than that of Example 1. The appropriate concentration in Example 1 of the present application can make the coating cover the surface of the braided wire more evenly and densely, effectively blocking the attachment and growth of marine organisms, further proving the superiority of the 65% polytetrafluoroethylene suspension concentration used in Example 1 for preventing the attachment of marine organisms. The concentration of the polytetrafluoroethylene suspension in Comparative Example 3 is 85%. Too high a concentration causes the coating to crack and fall off easily during the impregnation and subsequent treatment process. In the 3-6 month test, although the antifouling effect is good at the beginning, as time goes by, the integrity of the coating is destroyed and the biological attachment area gradually increases. The coating of Example 1 maintains good integrity and antifouling performance during the entire test period, indicating that the concentration of 65% in Example 1 can not only ensure the effective formation of the coating, but also maintain its long-term stability, avoiding the negative effects caused by excessive concentration.

[0046] It can be seen from Examples 1-7 and Table 1 that an immersion time of 20-40 minutes enables the braided wire to fully absorb the polytetrafluoroethylene suspension, ensuring that the coating completely covers the surface of the braided wire and penetrates to a certain depth to form a good bond with the braided wire material. Using a nano-scale aqueous polytetrafluoroethylene suspension, the nano-scale particle size enables it to be more evenly dispersed in the solution, and it is easier to penetrate into the fine structure of the braided wire during the immersion process, forming a denser, uniform and smoother coating. Compared with the traditional heat conduction heating method, the uniformity of the microwave field can ensure that the coating on the entire surface of the braided wire obtains a consistent curing effect, avoiding local overheating or insufficient curing, making the performance of the braided wire more stable and reliable, effectively reducing product quality differences caused by uneven curing, and improving product qualification rate and stability.

[0047] Combining Examples 1 and 8 with Table 1, it can be seen that the laser pulse processing step can form a specific micro-nano structure on the surface of the braided wire semi-finished product, change the physical and chemical properties of the surface, increase the roughness complexity at the microscopic scale, further reduce the possibility of marine biological attachment, effectively extend the cleaning and use cycle of the braided wire in the marine environment, and reduce the problem of biological fouling causing the performance degradation of the cage. In addition, when laser pulse processing is performed under the conditions of 1064nm wavelength, 30ns pulse width, and 120Hz frequency, the 1064nm wavelength can effectively act on the material surface, the 30ns pulse width can accurately control the melting and recasting of the surface material to form an ideal micro-nano structure, and the 120Hz frequency ensures uniform and efficient processing, which not only stably improves the anti-marine biological attachment performance of the braided wire, but also controls the loss of mechanical properties of the treated braided wire within a very small range.

[0048] 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 non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present application.

Claims

1. A post-processing method for high-strength marine organism-proof braided wire for deep-sea aquaculture, characterized in that: The following steps are involved: The ultra-high molecular weight polyethylene fibers are twisted into threads to serve as the core of the braided thread; Twisting the polytetrafluoroethylene film split fibers to make the skin wire of the braided wire; Processing the core wire and the skin wire through a braiding machine to obtain a braided wire semi-finished product; The semi-finished braided wire is immersed in a polytetrafluoroethylene suspension for dipping treatment; The braided line after impregnation treatment is shaped at high temperature to obtain a fishing braided line that prevents marine organisms from attaching.

2. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The braided wire semi-finished product needs to be subjected to laser pulse treatment before the dipping treatment.

3. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 2, characterized in that: The laser pulse treatment was performed under the conditions of 1064 nm wavelength, 30 ns pulse width and 120 Hz frequency.

4. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The concentration of the polytetrafluoroethylene suspension is 60%-75%.

5. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The braided wire is immersed in the polytetrafluoroethylene suspension for 20-40 minutes.

6. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The polytetrafluoroethylene suspension is a nano-scale aqueous polytetrafluoroethylene suspension.

7. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The high temperature setting temperature is 300-350° C. and the time is 15-30 minutes.

8. The post-processing method of the high-strength marine organism-proof braided wire for deep-sea aquaculture according to claim 1, characterized in that: The high temperature setting adopts microwave curing with a power of 2-5 kW and a frequency of 2.45 GHz.

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