A method for preparing a sound-driven resonantly interlocked anticorrosion coating

Abstract

The application discloses a preparation method of an acoustic driving resonance interlocking anticorrosive coating, and specifically comprises the following steps: step 1, preparing resonance composite nanofibers; step 2, obtaining acoustic driving resonance composite nanofibers by screening the resonance composite nanofibers obtained in step 1 through screens with different aperture and fixing the length; step 3, dispersing the acoustic driving resonance composite nanofibers obtained in step 2 into a prepared coating, uniformly mixing and stirring to obtain acoustic driving resonance interlocking anticorrosive coating; and step 4, immersing a metal shielding layer after surface treatment into the acoustic driving resonance interlocking anticorrosive coating obtained in step 3, and obtaining the acoustic driving resonance interlocking anticorrosive coating after curing treatment. The preparation method can be used for preparing the surface anticorrosive coating of the metal shielding layer of a cable, can improve the mechanical properties, solves the problem that the metal shielding layer is unstable when being wound on a large scale, and has a wide prospect in the power cable industry.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion coating technology, specifically relating to a method for preparing an anti-corrosion coating with acoustically driven resonant interlocking. Background Technology

[0002] Corrosion of metallic materials is a common problem in industry and daily life. my country has a vast territory, and the cable laying conditions and service environments vary significantly across regions. Diurnal temperature differences, soil moisture, pH levels, and industrial environments all contribute to severe cable corrosion. The metallic shielding layer in the cable structure is an indispensable component of medium-voltage cross-linked polyethylene insulated power cables. It effectively reduces interference from external electromagnetic fields, ensures reliable grounding of electrical equipment, and enables short-circuit conduction in case of faults. Damage to the shielding layer can have serious consequences, even leading to catastrophic accidents.

[0003] Applying an anti-corrosion coating to the surface of the metal shielding layer is a common method to solve this problem. However, the metal shielding layer usually needs to be wrapped around the cable. To improve the shielding effect, there are overlapping layers between the metal shielding layers. If the wrapping is not tight, or if the shielding layer cracks or shifts between layers, these minor issues can have irreparable and serious consequences for the cable quality. Therefore, improving the stability of the anti-corrosion coating in the overlapping areas between the metal shielding layers is particularly important.

[0004] Chinese patent "An Environmentally Friendly Nylon Sheathed Special Cable and Extrusion Process" (Application No.: 202410522674.1, Publication No.: CN118173313 A, Publication Date: 2024.06.11) discloses an environmentally friendly nylon sheathed special cable and extrusion process. In this cable, the copper tape shielding layer is wrapped tightly around the copper wire loosely wound layer in a single-layer overlapping wrapping method. This wrapping method has a good electromagnetic shielding effect, but the shielding layer is not treated with anti-corrosion, and it will corrode in humid or corrosive gas environments. Furthermore, improper wrapping process can cause the copper wire to cut into or embed into the inner insulation material, resulting in a decrease in electromagnetic shielding effect.

[0005] Chinese patent "A Special Cable for Power Connection in Air Force Radar System Assembly" (Application No.: 202410434449.2, Publication No.: CN118039242A, Publication Date: 2024.05.14) discloses a special cable for power connection in Air Force radar system assembly. The shielding layer is formed by spirally overlapping aluminum foil strips, with an overlap rate greater than 25%, resulting in good shielding performance. However, aluminum foil has poor corrosion resistance in humid environments, and the overlapping wrapping can lead to interlayer movement during cable use, affecting the long-term stability and reliability of the cable.

[0006] Chinese patent "A Novel 10KV Medium-Voltage Coal Mining Machine Frequency Converter Cable" (Application No.: 202410331776.5, Publication No.: CN117936183A, Publication Date: 2024.04.26) discloses a novel 10KV medium-voltage coal mining machine frequency converter cable. In this cable, the shielding layer forms a columnar spiral structure by spirally wrapping around the outside of the cable core in a spiral manner, which enhances the shielding function and forms a reinforcing layer structure on the outside of the cable core to improve the tensile strength of the cable. However, the shielding layer is not treated with anti-corrosion, and the interlayer bonding of the shielding layer is poor.

[0007] Chinese patent "A Corrosion-Resistant and Fire-Resistant Cable" (Application No.: 202322913358.0, Authorization No.: CN221125589U, Publication Date: 2024.06.11) discloses a corrosion-resistant and fire-resistant cable, wherein the shielding layer is made of tin-plated copper braided and wrapped around a wrapping tape, a waterproof layer is provided outside the shielding layer, and a corrosion-resistant layer is provided outside the waterproof layer, giving the cable a certain degree of corrosion resistance. However, the tin-plated copper shielding layer is unstable at high temperatures, and the difference in its thermal expansion coefficient can cause the shielding layer to deform or delaminate, affecting the overall performance of the cable. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preparing an anti-corrosion coating with acoustically driven resonant interlocking, which solves the problem of instability of metal shielding layers during large-scale wrapping in the prior art.

[0009] The technical solution adopted in this invention is:

[0010] A method for preparing an acoustically driven resonant interlocking anti-corrosion coating is specifically implemented according to the following steps:

[0011] Step 1: Preparation of resonant composite nanofibers

[0012] Organic polymers, deionized water, tetraethyl orthosilicate, and phosphoric acid are mixed evenly to obtain a spinning solution. The spinning solution is electrospun to obtain a silica nanofiber membrane. The silica nanofiber membrane is placed in a zinc oxide precursor solution for hydrothermal reaction and dried to obtain resonant composite nanofibers.

[0013] Step 2: Obtain acoustically driven resonant composite nanofibers with a fixed length.

[0014] The resonant composite nanofibers obtained in step 1 were passed through sieves of different pore sizes and processed to a fixed length to obtain acoustically driven resonant composite nanofibers.

[0015] Step 3: Prepare acoustically driven resonant interlocking anti-corrosion coating

[0016] The acoustically driven resonant composite nanofibers obtained in step 2 are dispersed into the pre-made coating and mixed evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0017] Step 4: Dip-coating the acoustically driven resonant interlocking anti-corrosion coating

[0018] The surface-treated metal shielding layer is immersed in the acoustically driven resonant interlocking anti-corrosion coating obtained in step 3, and after curing, an acoustically driven resonant interlocking anti-corrosion coating is obtained.

[0019] Further, the spinning solution in step 1 is composed of the following substances by mass percentage: 3.9%-10.8% organic polymer, 65%-70% deionized water, 24%-26% tetraethyl orthosilicate, and 0.1%-0.2% phosphoric acid, with the total mass of the above components being 100%. The organic polymer is any one of polyvinyl alcohol, polyvinylpyrrolidone, and polyethylene oxide.

[0020] Furthermore, the electrospinning parameters in step 1 are as follows: spinning voltage is 20-26kV, receiving distance is 10-15cm, and feed speed is 0.1-0.2ml / h.

[0021] Further, the precursor solution in step 1 is composed of the following substances by mass percentage: 1-3% zinc nitrate, 0.4-0.8% hexamethylenetetramine, 0.2-0.6% ammonia, and 96-98% deionized water, with the total mass of the above components being 100%. The hydrothermal reaction parameters are: hydrothermal temperature 95-105℃, hydrothermal time 16-20h, drying temperature 70-90℃, and drying time 12h-24h.

[0022] Furthermore, in step 2, the sieves with different pore sizes are any combination of two of the following: 75μm, 106μm, 150μm, and 180μm. The fixed length treatment is performed by passing the resonant composite nanofibers through sieves with pore sizes decreasing from large to small, and selecting the resonant composite nanofibers left on the small-pore sieves.

[0023] Furthermore, in step 3, the acoustically driven resonant interlocking anti-corrosion coating is composed of the following substances by mass percentage: 15%-30% acoustically driven resonant composite nanofibers and 70%-85% pre-formed coating, with the total mass of the above components being 100%.

[0024] Further, the pre-coating described in step 3 is composed of the following substances by mass percentage: 35%-45% organic polymer, 18%-50% inorganic ceramic powder, 10%-30% solvent, 3%-4% curing agent, and 2%-3% dispersant, with the total mass of the above components being 100%.

[0025] Further, the organic polymer mentioned in step 3 is any one of epoxy resin, polyester, polyurethane and polyvinyl chloride; the inorganic ceramic powder is any one of silicon oxide, alumina and zirconium oxide; the solvent is any one of methanol, isopropanol, dimethylformamide and tetrahydrofuran; the curing agent is any one of diisocyanate and triisocyanate; and the dispersant is any one of sodium dodecyl sulfate, polyacrylate and polyvinyl ester.

[0026] Further, the specific steps for surface treatment in step 4 are as follows: cleaning and polishing the surface of the metal shielding layer; immersion is performed by completely immersing the metal shielding layer in the acoustically driven interlocking anti-corrosion coating for 24-36 hours; and curing is performed by removing the metal shielding layer from the acoustically driven interlocking anti-corrosion coating, tilting and rotating it to remove excess coating, and then curing it at room temperature for 72-96 hours.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention provides a method for preparing an acoustically driven resonant interlocking anti-corrosion coating. This method enhances the interlayer bonding force in the superimposed region of the metal shielding layer by adding resonant composite nanofibers to the anti-corrosion coating. By using meshes of different apertures to fix the length of the resonant composite nanofibers, their natural frequency can be matched with the output frequency of commercially available ultrasonic equipment, thereby achieving resonant deformation interlocking. Simultaneously, zinc oxide nanoneedles grown on the surface of the resonant composite nanofibers increase the degree of freedom of resonant deformation, enhancing the interlocking stability of the superimposed region of the metal shielding layer. This method can be used to prepare anti-corrosion coatings on the surface of cable metal shielding layers, solving the problem of instability in large-scale wrapping of metal shielding layers, and has broad prospects in the power cable industry. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an anti-corrosion coating with acoustically driven resonant interlocking prepared according to the present invention;

[0030] In the attached diagram, 1-metal shielding layer, 2-acoustic driven resonance interlocking anti-corrosion coating. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] A method for preparing an acoustically driven resonant interlocking anti-corrosion coating is specifically implemented according to the following steps:

[0033] Step 1: Preparation of resonant composite nanofibers

[0034] An organic polymer, deionized water, tetraethyl orthosilicate, and phosphoric acid are mixed uniformly to obtain a spinning solution. The spinning solution is then electrospun to obtain a silica nanofiber membrane. The silica nanofiber membrane is placed in a zinc oxide precursor solution and reacted hydrothermally at 95-105℃ for 16-20 hours. The hydrothermally reacted silica nanofiber membrane is then dried at 70-90℃ for 12-24 hours to obtain resonant composite nanofibers. The organic polymer content is 3.9%-10.8%, deionized water is 65%-70%, and tetraethyl orthosilicate is 24%-25%. The composition includes 6% zinc nitrate, 0.1%-0.2% phosphoric acid, and the total mass of the above components is 100%; the organic polymer is any one of polyvinyl alcohol, polyvinylpyrrolidone, and polyethylene oxide; the electrospinning parameters are: spinning voltage of 20-26kV, receiving distance of 10-15cm, and feed speed of 0.1-0.2ml / h; the precursor solution includes 1-3% zinc nitrate, 0.4-0.8% hexamethylenetetramine, 0.2-0.6% ammonia, and 96-98% deionized water, and the total mass of the above components is 100%.

[0035] Step 2: Obtain acoustically driven resonant composite nanofibers with a fixed length.

[0036] The resonant composite nanofibers obtained in step 1 are passed through sieves of different pore sizes and processed to a fixed length to obtain acoustically driven resonant composite nanofibers. The sieves of different pore sizes are any combination of two of 75μm, 106μm, 150μm, and 180μm. The fixed length processing is performed by passing the resonant composite nanofibers through sieves of decreasing pore size and selecting the resonant composite nanofibers left on the sieves with smaller pore sizes.

[0037] Step 3: Prepare acoustically driven resonant interlocking anti-corrosion coating

[0038] The acoustically driven resonant composite nanofibers obtained in step 2 are dispersed into a pre-formed coating and mixed evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating. The acoustically driven resonant composite nanofibers comprise 15%-30%, the pre-formed coating comprises 70%-85%, and the total mass of these components is 100%. The pre-formed coating contains 35%-45% organic polymer, 18%-50% inorganic ceramic powder, 10%-30% solvent, 3%-4% curing agent, and 2%-3% dispersant, with the total mass of these components being 100%. The organic polymer is any one of epoxy resin, polyester, polyurethane, and polyvinyl chloride; the inorganic ceramic powder is any one of silicon dioxide, alumina, and zirconium oxide; the solvent is any one of methanol, isopropanol, dimethylformamide, and tetrahydrofuran; the curing agent is any one of diisocyanate and triisocyanate; and the dispersant is any one of sodium dodecyl sulfate, polyacrylate, and polyvinyl acetate.

[0039] Step 4: Dip-coating the acoustically driven resonant interlocking anti-corrosion coating

[0040] After cleaning and polishing the surface of the metal shielding layer, immerse it in the acoustically driven resonant interlocking anti-corrosion coating obtained in step 3 for 24-36 hours. After removing the metal shielding layer from the acoustically driven interlocking anti-corrosion coating, tilt and rotate it to remove excess acoustically driven interlocking anti-corrosion coating, and then cure it at room temperature for 72-96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0041] Figure 1 This is a schematic diagram of an anti-corrosion coating with acoustically driven resonant interlocking prepared according to the present invention. Figure 1 As can be seen, the acoustically driven resonant interlocking anti-corrosion coating 2 is coated on the metal shielding layer 1. The resonant composite nanofibers in the acoustically driven anti-corrosion coating can resonate under the sound waves generated by the commercially available ultrasonic generator, thereby causing the anti-corrosion coating in the superimposed area of ​​the metal shielding layer to interlock and provide interlayer bonding force.

[0042] This invention constructs zinc oxide nanoneedles on the surface of silica fibers by controlling the hydrothermal temperature within the range of 95-105℃ and the hydrothermal time within the range of 16-20h, thus obtaining resonant composite nanofibers. By selecting a sieve with any combination of two of the following sizes (75μm, 106μm, 150μm, 180μm), the natural frequency of the resonant composite nanofibers is controlled within the range of 20-40kHz, facilitating matching with the generating frequency of commercially available ultrasonic instruments. The distribution of the acoustically driven resonant composite nanofibers in the anti-corrosion coating is controlled by controlling the percentage of these nanofibers in the anti-corrosion coating. The uniformity and integrity of the acoustically driven anti-corrosion coating growth are controlled by controlling the time for the metal shielding layer to be completely immersed in the anti-corrosion coating to be 24-36h. Excess acoustically driven interlocking anti-corrosion coating is removed by tilting and rotating before room temperature curing, and the curing time is controlled to be 72-96h, thus ensuring that the resonant composite nanofibers in the acoustically driven anti-corrosion coating have deformable space.

[0043] The zinc oxide nanoneedles grown on the surface of the resonant composite nanofibers in the acoustically driven anti-corrosion coating provide a higher degree of freedom for resonant deformation. This allows the coating to better adapt to and resist deformation under external mechanical stress or environmental factors, thereby improving the interlocking stability of the superimposed metal shielding layer area. This anti-corrosion coating not only provides effective corrosion protection but also enhances the overall mechanical properties of the coating and solves problems such as coating loosening and poor interlayer bonding in large-scale metal shielding wrapping. This invention has broad application prospects in the power cable industry.

[0044] Example 1

[0045] A spinning solution was prepared by uniformly mixing 6.8% polyvinyl alcohol, 68% deionized water, 25% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 96% deionized water, and subjected to hydrothermal reaction at 105 °C for 16 h. The membrane was then dried at 90 °C for 12 h to obtain resonant composite nanofibers.

[0046] Resonant composite nanofibers were sequentially passed through 180μm and 150μm sieves, and the fibers on the 150μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate were mixed evenly to obtain a pre-coating. Subsequently, 30% of the acoustically driven resonant composite nanofibers and 70% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0047] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0048] Example 2

[0049] A spinning solution was prepared by uniformly mixing 5.9% polyvinylpyrrolidone, 70% deionized water, 24% tetraethyl orthosilicate, and 0.1% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 26 kV, a receiving distance of 10 cm, and a feed rate of 0.15 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 2% zinc nitrate, 0.6% hexamethylenetetramine, 0.4% ammonia, and 97% deionized water, and subjected to hydrothermal reaction at 95 °C for 20 h. The membrane was then dried at 70 °C for 24 h to obtain resonant composite nanofibers.

[0050] Resonant composite nanofibers were sequentially passed through 150μm and 106μm sieves, and the fibers on the 106μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 37% polyurethane, 40% alumina, 18% dimethylamide, 3% triisocyanate, and 2% polyacrylate were mixed evenly to obtain a pre-coating. Subsequently, 15% of the acoustically driven resonant composite nanofibers and 85% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0051] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 24 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 72 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0052] Example 3

[0053] A spinning solution was prepared by uniformly mixing 3.9% polyethylene oxide, 70% deionized water, 26% tetraethyl orthosilicate, and 0.1% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 1% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 98% deionized water, and subjected to hydrothermal reaction at 105 °C for 20 h. The membrane was then dried at 70 °C for 24 h to obtain resonant composite nanofibers.

[0054] Resonant composite nanofibers were sequentially passed through 106μm and 75μm sieves, and the fibers on the 75μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 45% polyvinyl chloride, 20% zirconium oxide, 30% tetrahydrofuran, 3% diisocyanate, and 2% polyvinyl ester were mixed evenly to obtain a pre-coating. Subsequently, 25% of the acoustically driven resonant composite nanofibers and 75% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0055] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 30 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 80 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0056] Example 4

[0057] A spinning solution was prepared by uniformly mixing 10.8% polyvinyl alcohol, 65% deionized water, 24% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 20 kV, a receiving distance of 12 cm, and a feed rate of 0.2 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.8% hexamethylenetetramine, 0.2% ammonia, and 96% deionized water, and subjected to hydrothermal reaction at 100°C for 18 h. The membrane was then dried at 80°C for 18 h to obtain resonant composite nanofibers.

[0058] Resonant composite nanofibers were sequentially passed through 180μm and 106μm sieves, and the fibers on the 106μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 35% polyester, 50% alumina, 10% methanol, 3% isocyanate, and 2% polyacrylate were mixed evenly to obtain a pre-coating. Subsequently, 20% of the acoustically driven resonant composite nanofibers and 80% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0059] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0060] Comparative Example 1

[0061] A spinning solution was prepared by uniformly mixing 6.8% polyvinyl alcohol, 68% deionized water, 25% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 96% deionized water, and dried at 90°C for 12 h to obtain resonant composite nanofibers.

[0062] Resonant composite nanofibers were sequentially passed through 180μm and 150μm sieves, and the fibers on the 150μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate were mixed evenly to obtain a pre-coating. Subsequently, 30% of the acoustically driven resonant composite nanofibers and 70% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0063] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0064] The difference between Comparative Example 1 and Example 1 is that the resonant composite nanofibers in step 1 were not subjected to hydrothermal treatment.

[0065] Comparative Example 2

[0066] A spinning solution was prepared by uniformly mixing 6.8% polyvinyl alcohol, 68% deionized water, 25% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 96% deionized water, and subjected to hydrothermal reaction at 105 °C for 16 h. The membrane was then dried at 90 °C for 12 h to obtain resonant composite nanofibers.

[0067] A pre-coating was prepared by uniformly mixing 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate. Subsequently, 30% resonant composite nanofibers and 70% of the pre-coating were mixed and stirred uniformly to obtain a resonant interlocking anti-corrosion coating.

[0068] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the resonant interlocking anti-corrosion coating, the excess resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the resonant interlocking anti-corrosion coating.

[0069] The difference between Comparative Example 2 and Example 1 is that step 2 was not performed, and the resonant composite nanofibers obtained in step 1 were directly added during the mixing and stirring in step 3.

[0070] Comparative Example 3

[0071] A spinning solution was prepared by uniformly mixing 6.8% polyvinyl alcohol, 68% deionized water, 25% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 96% deionized water, and subjected to hydrothermal reaction at 105 °C for 16 h. The membrane was then dried at 90 °C for 12 h to obtain resonant composite nanofibers.

[0072] Resonant composite nanofibers were passed through a 150μm sieve, and the fibers on the 150μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate were mixed evenly to obtain a pre-coating. Subsequently, 30% acoustically driven resonant composite nanofibers and 70% pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0073] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the acoustically driven resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0074] The difference between Comparative Example 3 and Example 1 is that the fixed length processing in step 2 only passes through a screen with a single aperture.

[0075] Comparative Example 4

[0076] An anti-corrosion coating is obtained by uniformly mixing 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate.

[0077] After cleaning and polishing the surface of the metal shielding layer, it was immersed in the anti-corrosion coating for 36 hours. After removing the metal shielding layer from the anti-corrosion coating, the excess anti-corrosion coating was removed by tilting and rotating it. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0078] The difference between Comparative Example 4 and Example 1 is that the acoustically driven resonant interlocking anti-corrosion coating in step 3 does not contain acoustically driven resonant composite nanofibers.

[0079] Comparative Example 5

[0080] A spinning solution was prepared by uniformly mixing 6.8% polyvinyl alcohol, 68% deionized water, 25% tetraethyl orthosilicate, and 0.2% phosphoric acid. The spinning solution was electrospun under the conditions of a spinning voltage of 22 kV, a receiving distance of 15 cm, and a feed rate of 0.1 ml / h to obtain a silica fiber membrane. The silica fiber membrane was placed in a precursor solution of 3% zinc nitrate, 0.4% hexamethylenetetramine, 0.6% ammonia, and 96% deionized water, and subjected to hydrothermal reaction at 105 °C for 16 h. The membrane was then dried at 90 °C for 12 h to obtain resonant composite nanofibers.

[0081] Resonant composite nanofibers were sequentially passed through 180μm and 150μm sieves, and the fibers on the 150μm sieve were collected to obtain acoustically driven resonant composite nanofibers. 45% epoxy resin, 18% silica, 30% isopropanol, 4% diisocyanate, and 3% sodium dodecyl sulfate were mixed evenly to obtain a pre-coating. Subsequently, 30% of the acoustically driven resonant composite nanofibers and 70% of the pre-coating were mixed and stirred evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating.

[0082] After cleaning and polishing the surface of the metal shielding layer, it was not completely immersed in the acoustically driven resonant interlocking anti-corrosion coating for 36 hours. After removing the metal shielding layer from the acoustically driven resonant interlocking anti-corrosion coating, the excess acoustically driven resonant interlocking anti-corrosion coating was removed by tilting and rotating. The coating was then cured at room temperature for 96 hours to obtain the acoustically driven resonant interlocking anti-corrosion coating.

[0083] The difference between Comparative Example 5 and Example 1 is that the metal shielding layer in step 4 was not completely immersed in the acoustically driven resonant interlocking anti-corrosion coating.

[0084] Table 1 compares the tensile strength and average corrosion rate over 240 hours of Example 1 with those of Comparative Examples 1-5.

[0085] Table 1

[0086]

[0087] As shown in Table 1, the resonant composite nanofibers in Example 1 passed through 180 μm and 150 μm sieves sequentially, with their length fixed between 150-180 μm. When the acoustic frequency and the natural frequency of the acoustically driven composite nanofibers in the anti-corrosion coating were close, resonant deformation occurred, thereby changing the degrees of freedom of the composite fibers on the film surface. This resulted in interlocking connections in the overlapping areas of the shielding strips, increasing the interlayer bonding force. Furthermore, the addition of silica-zinc oxide composite nanofibers also inhibited bacterial growth and corrosion. Therefore, Example 1 exhibited excellent tensile strength and a very low corrosion rate. Compared to Comparative Example 1, the resonant composite nanofibers were not hydrothermally treated. Therefore, the resulting anti-corrosion coating contained only silica fibers, and its surface lacked hydrothermally grown zinc oxide nanoneedles. When the acoustic frequency and the natural frequency of the silica nanofibers in the anti-corrosion coating were close, resonant deformation only occurred in the direction parallel to the coating, reducing the stability of the interlocking. Furthermore, the lack of zinc oxide also reduced the release of zinc ions to inhibit bacterial growth, resulting in a lower average corrosion rate. Compared to Comparative Example 2, the resonant nanofibers were not treated to a fixed length. During mixing with the pre-formulated coating, the fiber length was randomly distributed, reducing the probability of nanofiber resonance in the anti-corrosion coating and lowering the tensile strength of the metal shielding layer. Compared to Comparative Example 3, the resonant nanofibers only passed through a sieve with a single aperture, resulting in the fiber length being smaller than that aperture. This higher randomness in fiber length further reduced the probability of nanofiber resonance in the anti-corrosion coating and lowered the tensile strength of the metal shielding layer. Compared to Comparative Example 4, the anti-corrosion coating did not contain acoustically driven resonant nanofibers. The metal shielding layer coated with the anti-corrosion coating could not respond to the sound wave frequency, reducing the tensile strength of the metal shielding layer. Furthermore, the lack of titanium dioxide and zinc oxide also increased the average corrosion rate. Compared to Comparative Example 5, the metal shielding layer was not completely immersed in the acoustically driven resonant interlocking anti-corrosion coating. The uneven growth of the anti-corrosion coating significantly reduced the tensile strength and average corrosion rate of the shielding layer.

[0088] The above description of the present invention represents only some embodiments, but the present invention is not limited to the above embodiments. The above embodiments are illustrative and not restrictive. All specific extensions using the materials and methods of the present invention, without departing from the spirit and scope of the claims, are within the protection scope of the present invention.

Claims

1. A method for preparing an anti-corrosion coating with acoustically driven resonant interlocking, characterized in that, The specific steps are as follows: Step 1: Preparation of resonant composite nanofibers Organic polymers, deionized water, tetraethyl orthosilicate, and phosphoric acid are mixed evenly to obtain a spinning solution. The spinning solution is electrospun to obtain a silica nanofiber membrane. The silica nanofiber membrane is placed in a zinc oxide precursor solution for hydrothermal reaction and dried to obtain resonant composite nanofibers. Step 2: Obtain acoustically driven resonant composite nanofibers with a fixed length. The resonant composite nanofibers obtained in step 1 are passed through sieves of different pore sizes and processed to a fixed length to obtain acoustically driven resonant composite nanofibers. The sieves of different pore sizes are any combination of two of 75μm, 106μm, 150μm, and 180μm. The fixed length processing method is as follows: the resonant composite nanofibers are passed through sieves of decreasing pore size, and the resonant composite nanofibers left on the sieve with the smaller pore size are selected. Step 3: Prepare acoustically driven resonant interlocking anti-corrosion coating The acoustically driven resonant composite nanofibers obtained in step 2 are dispersed into the pre-made coating and mixed evenly to obtain an acoustically driven resonant interlocking anti-corrosion coating. Step 4: Dip-coating the acoustically driven resonant interlocking anti-corrosion coating The surface-treated metal shielding layer is immersed in the acoustically driven resonant interlocking anti-corrosion coating obtained in step 3, and after curing, an acoustically driven resonant interlocking anti-corrosion coating is obtained.

2. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 1, characterized in that, The spinning solution described in step 1 is composed of the following substances by mass percentage: 3.9%-10.8% organic polymer, 65%-70% deionized water, 24%-26% tetraethyl orthosilicate, and 0.1%-0.2% phosphoric acid. The total mass of the above components is 100%. The organic polymer is any one of polyvinyl alcohol, polyvinylpyrrolidone, and polyethylene oxide.

3. A method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to any one of claims 1 or 2, characterized in that, The electrospinning parameters mentioned in step 1 are: spinning voltage of 20-26kV, receiving distance of 10-15cm, and feed speed of 0.1-0.2ml / h.

4. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 1, characterized in that, The precursor solution in step 1 is composed of the following substances by mass percentage: 1-3% zinc nitrate, 0.4-0.8% hexamethylenetetramine, 0.2-0.6% ammonia, and 96-98% deionized water. The total mass of the above components is 100%. The hydrothermal reaction parameters are: hydrothermal temperature 95-105℃, hydrothermal time 16-20h, drying temperature 70-90℃, and drying time 12h-24h.

5. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 1, characterized in that, In step 3, the acoustically driven resonant interlocking anti-corrosion coating is composed of the following substances by mass percentage: 15%-30% acoustically driven resonant composite nanofibers and 70%-85% pre-formed coating, with the total mass of the above components being 100%.

6. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 5, characterized in that, The pre-coating described in step 3 is composed of the following substances by mass percentage: 35%-45% organic polymer, 18%-50% inorganic ceramic powder, 10%-30% solvent, 3%-4% curing agent, and 2%-3% dispersant, with the total mass of the above components being 100%.

7. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 6, characterized in that, The organic polymer mentioned in step 3 is epoxy resin; the inorganic ceramic powder is any one of silicon dioxide, aluminum oxide, and zirconium oxide; the solvent is any one of methanol, isopropanol, dimethylformamide, and tetrahydrofuran; the curing agent is any one of diisocyanate and triisocyanate; and the dispersant is any one of sodium dodecyl sulfate, polyacrylate, and polyvinyl ester.

8. The method for preparing an anti-corrosion coating with acoustically driven resonant interlocking according to claim 1, characterized in that, The specific steps for surface treatment in step 4 are as follows: cleaning and polishing the surface of the metal shielding layer; immersion: completely immersing the metal shielding layer in the acoustically driven interlocking anti-corrosion coating for 24-36 hours; curing: after removing the metal shielding layer from the acoustically driven interlocking anti-corrosion coating, tilting and rotating to remove excess acoustically driven interlocking anti-corrosion coating, and then curing at room temperature for 72-96 hours.

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