Composite fiber filler, self-repairing composite fiber anti-icing anticorrosive paint and preparation method of self-repairing composite fiber anti-icing anticorrosive paint

Abstract

The invention relates to the field of coating materials, in particular to a self-repairing composite fiber anti-icing anticorrosive coating and a preparation method thereof. According to the composite fiber filler, the microstructure of the filler comprises a fiber body and attachments, the attachments are composed of, by weight, 0.5 part of metal ion salt and 0.1-0.5 part of functional ion salt, and the fiber body comprises, by weight, 0.1 part of polymer; 0.1 to 0.2 part by weight of cobalt salt; and 0.5 part by weight of 2-methylimidazole. The coating containing the composite fiber filler provided by the invention or the self-repairing composite fiber anti-icing anticorrosive coating provided by the invention has good wear resistance, corrosion resistance and self-repairing performance, and can solve the problem of poor interface bonding in a traditional blending method. In addition, the coating has good anti-icing performance, the icing time can be delayed under the low-temperature illumination condition, and the service stability of the coating in the cold region environment is improved. The coating is not only suitable for ocean and industrial corrosion protection environments, but also has surface protection potential in an ice and snow environment, and the application scene of the coating in a low-temperature icing area is expanded.

Description

Technical Field

[0001] This invention relates to the field of coating materials, specifically to a self-healing composite fiber anti-icing and anti-corrosion coating and its preparation method. Background Technology

[0002] With the continuous advancement of industrialization, metallic materials face severe corrosion challenges in complex environments such as marine and chemical plants. Traditional anti-corrosion coatings primarily slow down the corrosion process through physical barriers, corrosion inhibitor release, or cathodic protection. However, during coating use, micro-cracks, pinholes, and other microscopic damage inevitably occur. Once corrosive media diffuse and penetrate along these defects, the coating's performance will rapidly deteriorate or even fail. To improve the long-term service life of materials, how to achieve timely self-repair of the coating after damage while maintaining highly efficient anti-corrosion functions has become a current research hotspot.

[0003] Hydrotalcite (LDH), due to its layered structure and anion exchange properties, can effectively adsorb corrosive chloride ions and release corrosion inhibitors, and is often used in the preparation of anti-corrosion coatings. Existing technologies (such as patent CN118085700A) can further enhance the dispersibility and mechanical stability of fillers in coatings and improve durability by in-situ composite of LDH with a fiber substrate. However, such methods mainly rely on the barrier properties of LDH and the ion exchange properties of LDHs to achieve chloride ion adsorption and passive release of corrosion inhibitors. They are not yet perfect for rapid healing of microcracks, and cannot trigger active repair through external stimuli (such as light) when the coating is damaged. The repair efficiency is limited by the diffusion rate of the corrosion inhibitor, affecting the long-term protective performance of the coating.

[0004] To address the aforementioned shortcomings, the concept of "self-healing coatings" has emerged in recent years. These coatings incorporate materials with external force-triggered or environmentally responsive properties into the corrosion protection system, enabling rapid healing of defects when the coating is damaged. Among these, photothermal self-healing has attracted significant attention due to its controllable response temperature and rapid repair speed: by loading functional components that efficiently convert light energy into heat energy into the coating, localized heating triggered by light exposure is achieved, promoting the flow or cross-linking of the organic matrix, thereby healing microcrack defects. However, if the photothermal material is incompatible with the coating or unevenly dispersed in the matrix, the repair efficiency will decrease, and new defect channels may form.

[0005] It is worth noting that frost deposition in extreme environments (such as polar regions, plateaus, wind power equipment, and aircraft shells) can seriously threaten the service performance of materials. The composite fiber coating provided in this application, due to its excellent photothermal conversion capability, can effectively delay the icing process under low-temperature conditions, exhibiting significant anti-icing properties and broadening the application boundaries of this type of coating in equipment used in cold regions and extreme climates.

[0006] In summary, developing an integrated functional coating system that combines photothermal self-healing, corrosion protection, corrosion-inhibiting ion release, and anti-icing properties is a key technological path to achieve long-term stable service of materials in extreme environments, and has significant engineering implications and broad application prospects. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a self-healing composite fiber anti-icing and anti-corrosion coating and its preparation method. The coating containing the composite fiber filler provided in this application, or the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application, both possess excellent anti-corrosion properties, wear resistance enhancement, anti-icing properties, and self-healing performance.

[0008] To achieve the above-mentioned technical effects, the first aspect of the present invention provides a composite fiber filler, wherein the microstructure of the filler includes a fiber body and an attachment, the attachment being composed of 0.5 parts by weight of a metal ion salt and 0.1 to 0.5 parts by weight of a functional ion salt, and the fiber body comprising the following components: 0.1 parts by weight of a polymer; 0.1 to 0.2 parts by weight of a cobalt salt and 0.5 parts by weight of 2-methylimidazole.

[0009] Furthermore, the polymer is selected from any one or more of polyacrylonitrile, cellulose acetate, polyvinylpyrrolidone, and polyvinylidene fluoride.

[0010] Furthermore, the cobalt salt is selected from any one or more of cobalt chloride, cobalt sulfate, cobalt nitrate, cobalt acetate, and cobalt carbonate.

[0011] Furthermore, the metal ion salt is selected from any one or more of ferric nitrate, copper nitrate, manganese chloride, and nickel nitrate, and the functional ion salt is selected from any one or more of sodium molybdate, sodium phosphate, and sodium tungstate.

[0012] The present invention also provides a method for preparing any of the aforementioned composite fiber fillers, comprising the following steps:

[0013] a) Cobalt salt, polymer and solvent are mixed in a weight ratio of (0.05~0.1):0.1:1, stirred at a certain temperature for a certain time, and then the spinning solution is injected into it to perform electrospinning to obtain the precursor nanofiber membrane.

[0014] b) Mix 2-methylimidazole, cobalt salt and deionized water in a weight ratio of 0.5:(0.05~0.1):35, add the precursor nanofiber membrane obtained in step a) to fully impregnate it, and obtain modified nanofibers;

[0015] c) The modified nanofibers obtained in step b) are in situ coated with metal ion salts and functional ion salts to obtain composite fiber fillers.

[0016] Furthermore, the solvent mentioned in step a) is any one or more of acetone and N,N-dimethylformamide.

[0017] Furthermore, the certain temperature mentioned in step a) is 50℃~80℃.

[0018] Furthermore, in step a), the stirring is carried out at a speed of 300-600 rpm for 4-6 hours.

[0019] Furthermore, the electrospinning described in step a) includes:

[0020] Set the spinning translation distance to 40–80 mm, the syringe capacity to 10 mL, the positive voltage to 19–25 KV, the negative voltage to 2.8–3.5 KV, the injection rate to 1 mm / min, the receiving rate to 120 rpm, the translation speed to 40 mm / min, and the receiving distance to 18 cm; the electrospinning time to 8–12 hours.

[0021] Furthermore, in step b), after impregnation, the fibers are oscillated at room temperature at a speed of 100-120 rpm for 10-15 hours. The surface-treated fibers are then removed, washed three times with deionized water, and finally dried in a vacuum drying oven at 50-70°C to obtain modified nanofibers.

[0022] Furthermore, step c) includes:

[0023] 1) Mix metal ion salt and deionized water in a weight ratio of 0.5:(100-200) until homogeneous. Then add the modified nanofibers obtained in step b) and allow them to be fully impregnated. Shake at room temperature for 10-15 hours at a speed of 60-80 rpm. Take out the surface-treated fibers and wash them with deionized water 3 times. Finally, dry them in a vacuum drying oven at 50-70℃ to obtain primary composite fibers.

[0024] 2) Mix the functional ionic salt and deionized water in a weight ratio of (0.1-0.5):10 until homogeneous. Then add the aforementioned primary composite fiber and allow it to fully impregnate. Keep it at room temperature for 2-2.5 hours in a vacuum drying oven with a relative pressure of 0.01-0.06 MPa. After removing it, wash it three times with deionized water. Finally, dry it in a vacuum drying oven at 50-70°C to obtain the composite fiber filler.

[0025] This application also provides a composite fiber filler, which is prepared by any of the foregoing preparation methods.

[0026] The second aspect of this application is a self-healing composite fiber anti-icing and anti-corrosion coating, comprising any of the aforementioned composite fiber fillers and an organic coating.

[0027] Furthermore, the weight ratio of the composite fiber filler to the organic coating is 1:(100-200).

[0028] Furthermore, the organic coating is any one of polyurethane resin, epoxy resin, and acrylic resin.

[0029] This application also provides a method for preparing the self-healing composite fiber anti-icing and anti-corrosion coating, which includes mixing and stirring the components according to the specified ratio to obtain the self-healing composite fiber anti-icing and anti-corrosion coating.

[0030] This application also provides a method for using the self-healing composite fiber anti-icing and anti-corrosion coating, which includes spraying the self-healing composite fiber anti-icing and anti-corrosion coating onto the surface of a metal substrate and drying it at 60-65°C for 100-150 hours to obtain a self-healing anti-corrosion coating.

[0031] All raw materials described in this application can be obtained commercially, and their purity content must be higher than 98%.

[0032] The equipment used in the preparation method provided in this application are all conventional laboratory or factory equipment.

[0033] Unless otherwise specified, all components used in this application are measured in parts by weight or weight percentage.

[0034] This application utilizes electrospinning technology to prepare a fiber network with a diameter of 200-500 nm, and in-situ grows photothermal hydrotalcite nanosheets on the fiber surface, intercalating functional ions between the hydrotalcite layers. The integrated fiber-hydrotalcite hierarchical structure effectively enhances the dispersibility and interfacial stability of the nanosheets. Simultaneously, the photothermal responsive components endow the coating with rapid heating capability under light irradiation, enabling local self-crosslinking of the polymer matrix within a short time, thereby filling micro-cracks or voids. Combined with the ion exchange corrosion inhibition effect of hydrotalcite, long-term corrosion protection and self-healing properties are achieved. This invention significantly surpasses existing technologies in terms of functional integration, repair efficiency, mechanical properties, and longevity, overcoming the limitations of single-function coatings and significantly improving the service life and reliability of coatings in harsh corrosive environments, providing an innovative solution for next-generation high-performance anti-corrosion materials.

[0035] When the composite fiber filler provided in this application is applied to the coatings field, other coatings containing the composite fiber filler (excluding the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application) can still have good wear resistance and self-healing properties. For example, the self-healing composite fiber anti-icing and anti-corrosion coating formed by mixing the composite fiber filler provided in this application with inorganic coatings, or with inorganic coatings and organic coatings.

[0036] The coatings made from the composite fiber fillers provided in this application, or the self-healing composite fiber anti-icing and anti-corrosion coatings provided in this application, can solve the problem of poor interfacial bonding in traditional blending methods.

[0037] The coatings made from composite fiber fillers provided in this application, or the self-healing composite fiber anti-icing and anti-corrosion coatings provided in this application, improve photothermal conversion efficiency through the dispersion and combination of photothermal materials. Under light irradiation, the coating can quickly generate heat, promoting the flow and healing of self-healing materials and accelerating the repair process. At the same time, photothermal stimulation promotes the release of functional anions, synergistically enhancing the coating performance.

[0038] The composite fiber filler provided in this application adopts a multi-level synergistic reinforcement system of fiber-metal ion salt-functional ion salt, integrating these three materials into the filler system. This not only improves the corrosion resistance and self-healing ability of the coating, but also extends its service life. It has broad industrial application potential and provides a reliable solution for metal protection in harsh corrosive environments.

[0039] This invention significantly improves the anti-icing performance of the coating surface through a photothermal composite design. This coating can be widely applied to cold-region equipment, wind turbine blades, ship hulls, communication base stations, and other areas prone to icing, significantly enhancing the structure's low-temperature adaptability.

[0040] This invention constructs a novel multifunctional coupled protection system from multiple dimensions such as material structure, functional integration, and preparation process. While improving corrosion resistance and self-healing performance, it also achieves adaptability to multiple scenarios such as photothermal anti-icing and mechanical wear resistance. It has high engineering practical value and promotion potential, and provides an innovative solution for the long-term reliable protection of metal structures in harsh environments. Attached Figure Description

[0041] Figure 1 Here is a scanning electron microscope image of the composite fiber filler synthesized in Example 1 of this invention;

[0042] Figure 2 The image shown is a transmission electron microscope (TEM) image of the composite fiber filler synthesized in Example 6 of this invention.

[0043] Figure 3 A scanning electron microscope image of the composite fiber filler prepared in Example 11 of this invention;

[0044] Figure 4 Here is a scanning electron microscope image of the composite fiber filler synthesized in Example 21 of this invention;

[0045] Figure 5 This is a scanning electron microscope image of the damaged coating repair of the coating formulation 1 (Example 1) of the present invention;

[0046] Figure 6The graphs show the photothermal properties of coatings sprayed with coating formulations 1-3, 4-5 and comparative formulations of the present invention under simulated sunlight irradiation.

[0047] Figure 7 Bode diagrams of coatings applied by the coating formulations 1-3 of this invention and the comparative formulation after long-term immersion in a 3.5 wt.% NaCl solution;

[0048] Figure 8 This is a comparison chart showing the wear resistance of coatings sprayed using coating formulations 1-3, 4-5 of this invention and comparative formulations.

[0049] Figure 9 This is a comparison chart of the anti-icing performance of coatings sprayed with coating formulations 1-3, 4-5 and comparative formulations of the present invention. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., used in this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] I. Preparation of the composite fiber filler provided in this application

[0054] The composite fiber filler was prepared using the preparation method provided in this application, as follows:

[0055] a) Cobalt salt, polymer, and solvent are mixed in a weight ratio of (0.05–0.1):0.1:1, and stirred at 300–600 rpm for 4–6 hours at 50–80°C. The spinning solution is then injected into the mixture for electrospinning to obtain a precursor nanofiber membrane. The electrospinning process includes: setting a spinning translation distance of 40–80 mm, a syringe capacity of 10 mL, a positive voltage of 19–25 KV, a negative voltage of 2.8–3.5 KV, an injection rate of 1 mm / min, a receiving rate of 120 rpm, a translation speed of 40 mm / min, and a receiving distance of 18 cm; the electrospinning time is 8–12 hours.

[0056] b) Mix 2-methylimidazole, cobalt salt and deionized water in a weight ratio of 0.5:(0.05~0.1):35, add the precursor nanofiber membrane obtained in step a) to fully impregnate it, and after impregnation, shake at room temperature at a speed of 100~120rpm for 10~15 hours. Take out the surface-treated fiber and wash it with deionized water 3 times. Finally, place it in a vacuum drying oven and dry it at 50~70℃ to obtain modified nanofibers.

[0057] c) In situ coating the surface of the modified nanofibers obtained in step b) with metal ion salts and functional ion salts to obtain a composite fiber filler; step c) includes:

[0058] 1) Mix metal ion salt and deionized water in a weight ratio of 0.5:(100-200) until homogeneous. Then add the modified nanofibers obtained in step b) and allow them to be fully impregnated. Shake at room temperature for 10-15 hours at a speed of 60-80 rpm. Take out the surface-treated fibers and wash them with deionized water 3 times. Finally, dry them in a vacuum drying oven at 50-70℃ to obtain primary composite fibers.

[0059] 2) Mix the functional ionic salt and deionized water in a weight ratio of (0.1-0.5):10 until homogeneous. Then add the aforementioned primary composite fiber and allow it to fully impregnate. Keep it at room temperature for 2-2.5 hours in a vacuum drying oven with a relative pressure of 0.01-0.06 MPa. After removing it, wash it three times with deionized water. Finally, dry it in a vacuum drying oven at 50-70°C to obtain the composite fiber filler.

[0060] Composite fiber fillers of various embodiments were prepared using the above preparation method. Except for the above proportions, the proportions of each component used in each embodiment are shown in the table below.

[0061] Table 1 - The solvent used is acetone, the cobalt salt is cobalt chloride, the polymer is polyacrylonitrile, the metal ion salt is ferric nitrate, and the functional ion salt is sodium molybdate.

[0062]

[0063] Table 2 - Solvents used are DMF, cobalt salt is cobalt sulfate, polymer is cellulose acetate, metal ion salt is copper nitrate, and functional ion salt is sodium phosphate.

[0064]

[0065] Table 3 - Acetone was used as the solvent, cobalt nitrate as the cobalt salt, polyvinylpyrrolidone as the polymer, manganese chloride as the metal ion salt, and sodium tungstate as the functional ion salt.

[0066]

[0067] Table 4 - Solvents used are DMF, cobalt salt is cobalt acetate, polymer is polyvinylidene fluoride, metal ion salt is nickel nitrate, and functional ion salt is sodium molybdate.

[0068]

[0069] Table 5 - Acetone was used as the solvent, cobalt carbonate as the cobalt salt, polyacrylonitrile as the polymer, ferric nitrate as the metal ion salt, and sodium phosphate as the functional ion salt.

[0070]

[0071] II. Preparation of Coatings

[0072] The aforementioned composite fiber fillers from various embodiments were mixed with inorganic and organic coatings according to the proportions shown in the table below, sprayed onto the substrate surface, and dried at 60–65°C for 100–150 hours to obtain a self-healing anti-corrosion coating. The inorganic or organic coatings used can be selected from commonly used inorganic or organic coatings, or can be any one of the polyurethane resin, epoxy resin, or acrylic resin provided in this application. The formulation proportions of the obtained coatings are shown in the table below:

[0073] Table 6 - All component proportions are calculated in parts by weight. Actual weights are referenced from the aforementioned examples.

[0074]

[0075] To more effectively illustrate the efficacy of the composite fiber filler and self-healing composite fiber anti-icing and anti-corrosion coating provided in this application, this description also includes comparative examples for more effective illustration, such as the coating formulation prepared in CN118085700A - comparative formulation.

[0076] III. Performance Testing

[0077] The composite fiber fillers of the various embodiments, as well as the various coating formulations and comparative formulations, were subjected to structural and performance tests to illustrate the structure and efficacy of the composite fiber fillers and self-healing composite fiber anti-icing and anti-corrosion coatings provided in this application.

[0078] I. Microstructure Figures 1-4 )

[0079] Microstructural analysis of each embodiment revealed that the fiber surface was coated with metal ion salts and functional anion salts, as shown in the scanning electron microscope image of Example 1. Figure 1 As shown, the transmission electron microscope image of Example 6 is as follows: Figure 2 As shown, the scanning electron microscope image of Example 11 is as follows: Figure 3 As shown, the transmission electron microscope image of Example 16 is as follows: Figure 4 As shown.

[0080] II. Photothermal properties Figures 5-6 )

[0081] The coatings obtained from the various coating formulations 1-3, 4-5, and the comparative formulation were subjected to simulated photothermal response under sunlight irradiation. Their repair performance under light irradiation was then tested. The specific experimental steps and methods are as follows:

[0082] A scalpel was used to create scratches 80 micrometers wide and 100 micrometers deep on the coating surface, and the damaged coating was then irradiated with a 1-sun xenon lamp.

[0083] The repair performance data obtained by testing according to the above test method were averaged for coating formulations 1-3, 4-5, and the control formulation, and corresponding photothermal response diagrams were prepared for reference. Figures 5-6 As shown, Figure 5 This is a scanning electron microscope image of the damaged coating repair of the coating formulation 1 (Example 1) of the present invention; Figure 6 The figures show the photothermal performance of coatings applied by coating formulations 1-3, 4-5, and the comparative formulation of this invention under simulated sunlight irradiation.

[0084] The red curve represents the average distribution trend of the photothermal response temperature of coating formulations 1-3 under photothermal response (the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application is referred to as composite fiber coating in the figure). Figure 7 , Figure 8 (Also used as this abbreviation), the black curve represents the average distribution trend of coating formulations 4-5 under photothermal response and photothermal response temperature (the coatings made of composite fiber fillers provided in this application, referred to as coatings made of composite fiber fillers in the figure). Figure 8(This abbreviation is also used). The green curve represents the average distribution trend of the photothermal response temperature of the comparative formulation under photothermal response (CN118085700A). The self-healing composite fiber anti-icing and anti-corrosion coating provided in this application has a damage repair time of approximately 200 seconds and a photothermal performance of approximately 75.7℃; the comparative formulation has a damage repair time of approximately 12 hours and a photothermal performance of approximately 35℃. From Figure 6 It can be clearly seen from the above that the coating made of composite fiber filler provided in this application and the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application can effectively and quickly achieve the effects of self-repair and anti-corrosion.

[0085] III. Salt leaching ( Figure 7 )

[0086] The coatings obtained from formulations 1-3 and the comparative formulation were immersed in a 3.5 wt% NaCl solution for an extended period to obtain Bode plots. The specific experimental steps and methods are as follows:

[0087] Electrochemical tests were performed using a Corrtest CS350 electrochemical workstation, employing a traditional three-electrode system (reference electrode: saturated calomel electrode; counter electrode: carbon electrode; working electrode: self-made Q235 electrode). The test solution was 3.5 wt.% NaCl, at 10... -2 -10 5 Hz, amplitude 20mV range test.

[0088] The immersion test data obtained according to the above test method were averaged for coating formulations 1-3 and the control formulation, and corresponding Bode plots were prepared for reference. Figure 7 As shown, the curves represent the trend of coating formulations 1-3 and the control formulation under the influence of salt immersion. Figure 7 It can be clearly seen from this that the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application can still maintain its anti-corrosion effect for a long time under salt immersion conditions. From Figure 7 As can be seen from the data, the anti-corrosion time of the self-healing composite fiber anti-icing and anti-corrosion coating provided in this application is approximately 60 days (7.4 × 10⁻⁶). 8 Ω·cm 2 The corrosion protection time of the coating in the comparison formula is approximately 54 days (4.8 × 10⁻⁶). 8 Ω·cm 2 ).

[0089] IV. Wear resistance ( Figure 8 )

[0090] Friction tests were conducted on the coatings obtained from coating formulations 1-3, 4-5, and the comparative formulation to test their wear resistance. The specific experimental steps and methods are as follows:

[0091] The tribological properties of the coating were evaluated using a tribological testing machine. The sliding method was reciprocating sliding. Steel balls with a diameter of Φ6mm were used as the grinding balls. Under a load of 3N, the wear length was 7mm, the duration was 20min, the linear velocity was 280cm / min, and the total distance was 56m.

[0092] The comparison chart of the wear resistance of the various formulations is shown below. Figure 8 As shown, the average value of each formula is taken.

[0093] V. Anti-icing performance ( Figure 9 )

[0094] The coatings obtained from each of the coating formulations 1-3, 4-5, and the comparative formulation were subjected to anti-icing tests to determine their anti-icing performance. The specific experimental steps and methods are as follows:

[0095] The samples were placed on a cooling stage at -15°C, and a xenon lamp was used as the light source with an intensity of 1 sun. The freezing time of different sample surfaces under illumination was recorded.

[0096] The comparison chart of freezing times for each formula is shown below. Figure 9 As shown, the average value of each formula is taken. From Figure 9 As can be seen, the composite fiber coating provided in this application exhibits a significantly longer surface icing time compared to the comparative formulation, demonstrating excellent anti-icing performance. This performance is attributed to the efficient heating characteristics of the photothermal material and the interfacial moisture regulation effect formed by the fiber / hydrotalcite multi-level structure, which can effectively slow down the condensation and icing process at low temperatures, providing additional protection for the surface of equipment in low-temperature or icing environments.

[0097] It is clear from the above embodiments, coating formulations, comparative formulations, and various performance test data that the composite fiber filler and self-healing composite fiber anti-icing and anti-corrosion coating provided in this application can effectively improve the self-healing performance and anti-icing and anti-corrosion performance of the coating.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite fiber filler, characterized in that, The microstructure of the filler includes a fiber matrix and an attached substance. The attached substance consists of 0.5 parts by weight of a metal ion salt and 0.1 to 0.5 parts by weight of a functional ion salt. The fiber matrix includes the following components: 0.1 parts by weight of polymer; 0.1 to 0.2 parts by weight of cobalt salt; and 0.5 parts by weight of 2-methylimidazole.

2. The composite fiber filler according to claim 1, characterized in that, The polymer is selected from any one or more of polyacrylonitrile, cellulose acetate, polyvinylpyrrolidone, and polyvinylidene fluoride; the cobalt salt is selected from any one or more of cobalt chloride, cobalt sulfate, cobalt nitrate, cobalt acetate, and cobalt carbonate; the metal ion salt is selected from any one or more of ferric nitrate, copper nitrate, manganese chloride, and nickel nitrate; and the functional ion salt is selected from any one or more of sodium molybdate, sodium phosphate, and sodium tungstate.

3. The method for preparing the composite fiber filler according to claim 1, characterized in that, Includes the following steps: a) Cobalt salt, polymer and solvent are mixed in a weight ratio of (0.05~0.1):0.1:1, stirred at a certain temperature for a certain time, and then the spinning solution is injected into it to perform electrospinning to obtain the precursor nanofiber membrane. b) Mix 2-methylimidazole, cobalt salt and deionized water in a weight ratio of 0.5:(0.05~0.1):35, add the precursor nanofiber membrane obtained in step a) to fully impregnate it, and obtain modified nanofibers; c) The modified nanofibers obtained in step b) are in situ coated with metal ion salts and functional ion salts to obtain composite fiber fillers.

4. The preparation method according to claim 3, characterized in that, The solvent mentioned in step a) is any one or more selected from acetone and N,N-dimethylformamide; the specific temperature mentioned in step a) is 50℃~80℃; the stirring in step a) is carried out at a speed of 300~600 rpm for 4~6 hours; the electrospinning in step a) includes: Set the spinning translation distance to 40–80 mm, the syringe capacity to 10 mL, the positive voltage to 19–25 KV, the negative voltage to 2.8–3.5 KV, the injection rate to 1 mm / min, the receiving rate to 120 rpm, the translation speed to 40 mm / min, and the receiving distance to 18 cm; the electrospinning time to 8–12 hours.

5. The preparation method according to claim 3, characterized in that, In step b), after impregnation, the fibers are oscillated at room temperature at a speed of 100-120 rpm for 10-15 hours. The surface-treated fibers are then removed, washed three times with deionized water, and finally dried in a vacuum drying oven at 50-70°C to obtain modified nanofibers.

6. The preparation method according to claim 3, characterized in that, Step c) includes: 1) Mix metal ion salt and deionized water in a weight ratio of 0.5:(100-200) until homogeneous. Then add the modified nanofibers obtained in step b) and allow them to be fully impregnated. Shake at room temperature for 10-15 hours at a speed of 60-80 rpm. Take out the surface-treated fibers and wash them with deionized water 3 times. Finally, dry them in a vacuum drying oven at 50-70℃ to obtain primary composite fibers. 2) Mix the functional ionic salt and deionized water evenly in a weight ratio of (0.1-0.5):10, then add the aforementioned primary composite fiber to fully impregnate it, and keep it at room temperature for 2-2.5 hours in a vacuum drying oven with a relative pressure of 0.01-0.06 MPa. After taking it out, wash it three times with deionized water, and finally dry it in a vacuum drying oven at 50-70°C to obtain the composite fiber filler.

7. A composite fiber filler, wherein the composite fiber filler is prepared by any one of the preparation methods described in claims 3 to 6.

8. A self-healing composite fiber anti-icing and anti-corrosion coating, characterized in that, The composite fiber filler includes any one of claims 1 to 2 and 7, and an organic coating; the weight ratio of the composite fiber filler to the organic coating is 1:(100-200); the organic coating is any one of polyurethane resin, epoxy resin, and acrylic resin.

9. The method for preparing the coating as described in claim 8, characterized in that, The self-healing composite fiber anti-icing and anti-corrosion coating is obtained by mixing and stirring the components according to the specified ratio.

10. The method of using the coating described in claim 8, characterized in that, The process involves spraying the self-healing composite fiber anti-icing and anti-corrosion coating onto the surface of a metal substrate and then drying it at 60°C to 65°C for 100 to 150 hours to obtain a self-healing anti-corrosion coating.

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