Micro-nano composite super-amphiphobic coating and preparation method thereof
By preparing a micro-nano composite superhydrophobic coating, constructing micro-nano structures using the sol-gel method and modifying with quaternary ammonium salts, the problem of structural damage of the superhydrophobic coating in a microbial corrosive environment was solved, achieving long-term hydrophobic, oleophobic and active bactericidal effects.
Patent Information
- Application Number
- CN202410721801.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-12-05
AI Technical Summary
Existing superhydrophobic and oleophobic coatings cannot effectively protect the substrate in the microbial corrosion environment of the petroleum engineering field, leading to damage to the coating structure or an increase in surface energy, and thus failing to maintain hydrophobic and oleophobic properties for a long time.
A micro-nano composite superhydrophobic coating is used, and a micro-nano structure is constructed by sol-gel method. Fluorosiloxane is combined to reduce surface energy, and a quaternary ammonium salt modifier is used to give the coating active bactericidal ability. The preparation method includes mixing and curing distilled water, alkaline solution, modified silica particles, low surface energy surfactant, antibacterial modifier and adhesive.
It improves the service life of the coating in harsh oil and water environments, maintains hydrophobic and oleophobic properties, and endows it with active bactericidal capabilities, significantly enhancing its resistance to microbial corrosion.
Smart Images
Figure CN121064720A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of superhydrophobic coating technology, specifically relating to micro-nano composite superhydrophobic coatings, and also to a method for preparing micro-nano composite superhydrophobic coatings. Background Technology
[0002] Superhydrophobic coatings have become an emerging field in metal corrosion protection due to their excellent active liquid repellency, self-cleaning properties, and corrosion resistance, attracting widespread attention from the academic community.
[0003] Currently, there are three main methods for preparing superhydrophobic coatings: (1) establishing low surface energy micro / nano structures on the coating surface; (2) etching the substrate surface using different techniques to control the depth and density; and (3) modifying the etched surface with low surface energy. The prepared coating can actively resist the intrusion of corrosive media by maintaining a static contact angle greater than 150° for droplets or oil droplets with a surface tension greater than 26 mN / m. However, in the field of petroleum engineering, superhydrophobic coatings often face more complex service environments, such as corrosion of the coating by microorganisms such as saprophytic bacteria, sulfate-reducing bacteria, and iron bacteria. Existing superhydrophobic coatings cannot effectively protect the substrate in the face of microbial corrosion environments. The colonies attach and grow on the coating surface, which may lead to damage to the micro / nano structures on the coating surface or an increase in the surface energy of the coating, causing irreversible damage to the superhydrophobic coating. Summary of the Invention
[0004] The purpose of this invention is to provide a micro-nano composite superhydrophobic coating to solve the problem that existing superhydrophobic coatings cannot effectively protect the substrate in the face of microbial corrosive environments.
[0005] Another object of the present invention is to provide a method for preparing micro / nano composite superhydrophobic coatings.
[0006] The first technical solution adopted in this invention is a micro-nano composite superhydrophobic coating, which, by weight, comprises the following components: 100-200 parts distilled water, 1-5 parts alkaline solution, 2-3 parts modified silica particles, 0.1-0.5 parts low surface energy surfactant, 0.1-0.8 parts antibacterial modifier, 2-8 parts adhesive, and 4-10 parts organic solvent.
[0007] The invention is further characterized in that,
[0008] Ammonia water is used as the alkaline solution.
[0009] The particle size of the modified silica particles ranges from 15 nm to 300 nm.
[0010] The low surface energy surfactant is a fluorinated siloxane surfactant; the antibacterial modifier is one or both of trimethyl[3-(triethoxysilyl)propyl]ammonium chloride and dimethyloctadecyl[3-trimethoxysilyl]ammonium chloride.
[0011] The fluorinated siloxane surfactant is one or two of 1H,1H,2H,2H-perfluorooctyltriethoxysilane or 1H,1H,2H,2H-perfluorodecyltriethoxysilane, mixed in a mass ratio of 1:2.
[0012] The adhesive is a composite solution of polyethersulfone and polyvinylidene fluoride with a solid content of 30-40% and a curing temperature of 200℃-260℃. The mass ratio of polyethersulfone to polyvinylidene fluoride is 1:1 to 1:5.
[0013] The organic solvent is a composite of at least two of anhydrous ethanol, ethyl acetate, butyl acetate, and toluene; the mass ratio of ethyl acetate and anhydrous ethanol is 1:3, and the mass ratio of polyethersulfone and polyvinylidene fluoride is 1:3.5.
[0014] Another technical solution adopted in this invention is: the preparation method of the above-mentioned micro / nano composite superhydrophobic coating is specifically implemented according to the following steps:
[0015] Step 1: Weigh the raw material components according to the formula;
[0016] The raw material components, by weight, include: 100-200 parts distilled water, 1-5 parts alkaline solution, 2-3 parts modified silica particles, 0.1-0.5 parts low surface energy surfactant, 0.1-0.8 parts antibacterial modifier, 2-8 parts adhesive, and 4-10 parts organic solvent.
[0017] Step 2: At room temperature, distilled water, alkaline solution and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0018] Step 3: Add the low surface energy surfactant and antibacterial modifier to the uniformly mixed silicon solution in Step 2, and dry to obtain the organic superhydrophobic coating.
[0019] Step 4: Add the adhesive and organic solvent to the organic superhydrophobic coating from Step 3 and mix them evenly at room temperature;
[0020] Step 5: Apply the coating prepared in Step 4 evenly to the cleaned and degreased substrate by dip coating, spray coating, scraping coating or spin coating and cure it to obtain the final product.
[0021] The invention is further characterized in that,
[0022] Step 3: Drying temperature is 60℃, drying time is 6 hours.
[0023] Step 5: The substrate can be any one of carbon steel, stainless steel, aluminum, or glass; the curing temperature is 200℃~260℃, and the curing time is 30min~60min.
[0024] The beneficial effects of this invention are as follows: The micro-nano composite superhydrophobic coating prepared by this invention constructs a micro-nano structure through a sol-gel method, uses fluorinated siloxanes to reduce surface energy, and modifies the surface of the micro-nano structure with quaternary ammonium salts. On the one hand, it can effectively improve the hydrophobic / oleophobic ability of the coating, and on the other hand, it can endow the coating with active bactericidal ability, thereby effectively improving the service life of the coating in harsh oil and water environments. Attached Figure Description
[0025] Figure 1 The image shows the field emission scanning electron microscope (FEM) pattern of the micro / nano composite superhydrophobic coating prepared in Example 1 of this invention.
[0026] Figure 2 The EDS energy spectrum of the micro / nano composite superhydrophobic coating prepared in Example 1 of this invention;
[0027] Figure 3 Fourier transform infrared spectrum of the micro / nano composite superhydrophobic coating prepared in Example 1 of this invention;
[0028] Figure 4 This is a schematic diagram of the static contact angle of a water droplet prepared by the micro-nano composite superhydrophobic coating in Example 2 of the present invention;
[0029] Figure 5 This is a schematic diagram of the contact angle of oil droplets in the micro-nano composite superhydrophobic coating prepared in Example 2 of the present invention. Detailed Implementation
[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0031] The micro-nano composite superhydrophobic coating of the present invention comprises, by weight, the following components: 100-200 parts distilled water, 1-5 parts alkaline solution, 2-3 parts modified silica particles, 0.1-0.5 parts low surface energy surfactant, 0.1-0.8 parts antibacterial modifier, 2-8 parts adhesive, and 4-10 parts organic solvent.
[0032] The alkaline solution uses ammonia water, and the modified silica particles have a diameter of 15nm to 300nm.
[0033] The low surface energy surfactant uses fluorinated siloxane surfactants, which can effectively reduce the surface energy of the coating. Because fluorinated siloxane surfactants contain both hydrophilic and lipophilic groups, they can be uniformly dispersed in the solvent.
[0034] The fluorinated siloxane surfactant is one or two of 1H,1H,2H,2H-perfluorooctyltriethoxysilane or 1H,1H,2H,2H-perfluorodecyltriethoxysilane, mixed in a mass ratio of 1:2.
[0035] The antibacterial modifier is one or both of trimethyl[3-(triethoxysilyl)propyl]ammonium chloride and dimethyloctadecyl[3-trimethoxysilyl]ammonium chloride.
[0036] The adhesive uses a composite solution of polyethersulfone and polyvinylidene fluoride (PVDF) with a solid content of 30-40% and a curing temperature of 200-260℃. The mass ratio of PVDF to PVDF is 1:1 to 1:5, with a preferred mass ratio of 1:3.5. During the curing process, the composite adhesive crosslinks fluorinated silica particles with the matrix to form a high-density three-dimensional siloxane network structure, thereby improving the service life of the coating.
[0037] The organic solvent is a combination of at least two of anhydrous ethanol, ethyl acetate, butyl acetate, and toluene; the preferred mass ratio of ethyl acetate and anhydrous ethanol is 1:3.
[0038] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0039] Step 1: Weigh the raw material components according to the formula;
[0040] The raw material components, by weight, include: 100-200 parts distilled water, 1-5 parts alkaline solution, 2-3 parts modified silica particles, 0.1-0.5 parts low surface energy surfactant, 0.1-0.8 parts antibacterial modifier, 2-8 parts adhesive, and 4-10 parts organic solvent.
[0041] Step 2: At room temperature, distilled water, alkaline solution and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0042] Step 3: Add the low surface energy surfactant and antibacterial modifier to the uniformly mixed silicon solution in Step 2, and dry to obtain the organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0043] Step 4: Add the adhesive and organic solvent to the organic superhydrophobic coating from Step 3 and mix them evenly at room temperature;
[0044] Step 5: Apply the coating prepared in Step 4 evenly to the cleaned and degreased substrate by dip coating, spray coating, scraping coating or spin coating and cure it to obtain the final product.
[0045] The substrate can be any one of carbon steel, stainless steel, aluminum, or glass; the curing temperature is 200℃~260℃, and the curing time is 30min~60min.
[0046] Example 1
[0047] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0048] Step 1: Weigh the raw material components according to the formula; by weight, it includes: 100 parts distilled water, 1 part ammonia water, 2 parts modified silica particles with a particle size of 15nm, 0.1 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.1 parts trimethyl[3-(triethoxysilyl)propyl]ammonium chloride, 2 parts polyethersulfone and polyvinylidene fluoride in a mass ratio of 1:1, and a composite of 4 parts ethyl acetate and anhydrous ethanol in a mass ratio of 1:3.
[0049] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring to obtain a silica solution.
[0050] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and trimethyl[3-(triethoxysilyl)propyl]ammonium chloride to the silicon solution mixed evenly in Step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0051] Step 4: Add the composite of polyethersulfone, polyvinylidene fluoride, ethyl acetate, and anhydrous ethanol in a mass ratio of 1:1 to the organic superhydrophobic coating in Step 3, and mix them evenly at room temperature to obtain the final product.
[0052] Step 5: The coating is uniformly sprayed onto the substrate and cured at 200℃ for 30 minutes. The resulting coating surface exhibits a rich papillary structure, such as... Figure 1 and Figure 2 As shown, a dense papillary structure on the surface of the micron-scale structure can be clearly observed, such as... Figure 3 As shown, the Fourier transform infrared spectrum indicates the successful preparation of the micro-nano composite superhydrophobic coating, and the EDS spectrum also confirms the successful modification.
[0053] Example 2
[0054] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0055] Step 1: Weigh the raw material components according to the formula; by weight, it includes: 120 parts distilled water, 3 parts ammonia water, 2 parts modified silica particles with a particle size of 50 nm, 0.3 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.5 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 4 parts polyvinylidene fluoride and polyurethane mixed in a mass ratio of 1:3.5, and 8 parts ethyl acetate and butyl acetate.
[0056] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0057] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in Step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0058] Step 4: Add the mixture of polyvinylidene fluoride, polyurethane, ethyl acetate, and butyl acetate to the organic superhydrophobic coating from Step 3, and mix evenly at room temperature to obtain the final product.
[0059] Step 5: Spray the coating prepared in Step 4 onto the substrate surface, dry at room temperature for 30 minutes, and then cure at 220℃. Figure 4 and Figure 5 As shown, the static contact angle of the water droplet is 166.9°, the water droplet roll-off angle is 2°, the oil droplet contact angle is 155°, and the oil droplet roll-off angle is 5°.
[0060] Example 3
[0061] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0062] Step 1: Weigh the raw material components according to the formula; by weight, it includes: 120 parts distilled water, 5 parts ammonia water, 3 parts modified silica particles with a particle size of 100 nm, 0.5 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (mass ratio 1:2), 0.8 parts trimethyl[3-(triethoxysilyl)propyl]ammonium chloride and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride (mass ratio 1:1), 8 parts polyvinylidene fluoride and polyethersulfone (mass ratio 1:1), and a mixture of 10 parts anhydrous ethanol and toluene.
[0063] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0064] Step 3: 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 1H,1H,2H,2H-perfluorodecyltriethoxysilane, trimethyl[3-(triethoxysilyl)propyl]ammonium chloride, and dimethyloctadecyl[3-trimethoxysilyl]ammonium chloride are added to the silicon solution mixed evenly in Step 2, and dried to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0065] Step 4: Add the mixture of polyvinylidene fluoride, polyethersulfone, anhydrous ethanol, and toluene to the organic superhydrophobic coating from Step 3, and mix them uniformly at room temperature.
[0066] Step 5: After mechanically stirring the coating prepared in step 4 at room temperature for 60 minutes, spray it onto the substrate surface and dry it at room temperature for 30 minutes. Then, cure it at 260°C for 30 minutes to obtain the final product.
[0067] The coating prepared in this embodiment still retains its superhydrophobic and dihydrophobic properties after 100g, 800 mesh, and 1000 cycles of friction and wear.
[0068] Example 4
[0069] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0070] Step 1: Weigh the raw material components according to the formula. The raw material components, by weight, include: 150 parts distilled water, 4 parts ammonia water, 3 parts modified silica particles with a particle size of 150 nm, 0.5 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.7 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 7 parts polyethersulfone, 8 parts anhydrous ethanol and ethyl acetate (mass ratio 3:1).
[0071] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0072] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in Step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0073] Step 4: Add polyethersulfone, anhydrous ethanol, and ethyl acetate to the organic superhydrophobic coating from Step 3 and mix them uniformly at room temperature.
[0074] Step 5: The coating prepared in Step 4 is mechanically stirred at room temperature for 60 minutes, sprayed onto the substrate surface, dried at room temperature for 30 minutes, and then cured at 240℃ for 30 minutes to obtain the final product. The coating achieved the optimal grade in the mesh peel test.
[0075] Example 5
[0076] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0077] Step 1: Weigh the raw material components according to the formula. The raw material components, by weight, include: 20 parts distilled water, 3 parts ammonia water, 2 parts modified silica particles with a particle size of 300 nm, 0.3 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.8 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 4 parts polyethersulfone, 8 parts anhydrous ethanol and ethyl acetate (mass ratio 3:1).
[0078] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0079] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in Step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0080] Step 4: Add polyethersulfone, anhydrous ethanol, and ethyl acetate to the organic superhydrophobic coating from Step 3 and mix them uniformly at room temperature.
[0081] Step 5: After mechanically stirring the coating prepared in step 4 at room temperature for 60 minutes, apply it to the substrate surface and dry it at room temperature for 30 minutes, then cure it at 230°C for 30 minutes to obtain the coating. The antibacterial rate of the organic superhydrophobic coating is as high as 95.5% in the antibacterial test of saprophytic bacteria.
[0082] Example 6
[0083] The preparation method of the nanocomposite superhydrophobic coating is carried out according to the following steps:
[0084] Step 1: Weigh the raw material components according to the formula; by weight, it includes: 120 parts distilled water, 3 parts ammonia water, 2 parts modified silica particles with a particle size of 15 nm, 0.3 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.8 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 4 parts polyethersulfone, 8 parts butyl acetate and ethyl acetate (mass ratio 1:1).
[0085] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0086] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in Step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0087] Step 4: Add polyethersulfone, fluorocarbon resin, butyl acetate and ethyl acetate to the organic superhydrophobic coating from step 3 and mix them evenly at room temperature.
[0088] Step 5: The coating prepared in Step 4 is mechanically stirred at room temperature for 60 minutes, and then uniformly coated onto the cleaned and degreased substrate by dip coating, spray coating, scraping coating or spin coating to cure.
[0089] After spraying onto the substrate surface and drying at room temperature for 30 minutes, the coating is cured at 230℃ for 30 minutes to obtain the final product. In the sulfate-reducing bacteria antibacterial test, the coating showed a bactericidal rate of up to 95.5% compared to the organic superhydrophobic coating.
[0090] Example 7
[0091] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0092] Step 1: Weigh the raw material components according to the formula; by weight, it includes 120 parts distilled water, 3 parts ammonia water, 2 parts modified silica particles with a particle size of 15 nm, 0.3 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.8 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 4 parts polyethersulfone, 8 parts butyl acetate and ethyl acetate (mass ratio 1:3).
[0093] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0094] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0095] Step 4: Add polyethersulfone, butyl acetate and ethyl acetate to the organic superhydrophobic coating from step 3 and mix them evenly at room temperature;
[0096] Step 5: The coating prepared in Step 4 is mechanically stirred at room temperature for 60 minutes. The coating is then sprayed onto the substrate surface and dried at room temperature for 30 minutes, followed by curing at 230°C for 30 minutes. The resulting coating exhibits a 98.4% higher bactericidal rate compared to the organic superhydrophobic coating in the iron bacteria antibacterial test.
[0097] Example 8
[0098] The preparation method of the micro / nano composite superhydrophobic coating of the present invention is carried out according to the following steps:
[0099] Step 1: Weigh the raw material components according to the formula; by weight, it includes: 150 parts distilled water, 3 parts ammonia water, 2 parts modified silica particles with a particle size of 200 nm, 0.3 parts 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 0.5 parts dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride, 4 parts polyethersulfone and polyvinylidene fluoride (mass ratio 1:2), and 9 parts butyl acetate and ethyl acetate (mass ratio 1:3);
[0100] Step 2: At room temperature, distilled water, ammonia water and modified silica nanoparticles are mixed under magnetic stirring. After uniform mixing, a silica solution is obtained.
[0101] Step 3: Add 1H,1H,2H,2H-perfluorooctyltriethoxysilane and dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride to the silicon solution mixed evenly in step 2, and dry to obtain an organic superhydrophobic coating; the drying temperature is 60℃ and the drying time is 6h.
[0102] Step 4: Add polyethersulfone, polyvinylidene fluoride, butyl acetate and ethyl acetate to the organic superhydrophobic coating from step 3 and mix them uniformly at room temperature;
[0103] Step 5: Mechanically stir the coating prepared in Step 4 at room temperature for 60 minutes. Spray the coating onto the substrate surface and dry at room temperature for 30 minutes, then cure at 260°C for 30 minutes to obtain the final product. The coating maintains its superhydrophobic state for 1000 hours under a neutral salt spray test environment.
[0104] The methods for preparing micro / nano composite superhydrophobic and superoleophobic coatings in the above eight embodiments ensure coating quality and stability through precise control of steps such as proportioning, mixing, drying, and curing. Each embodiment's formulation contains specific proportions of raw materials, such as distilled water, ammonia, and modified silica particles, and adds organic additives to give the coating superhydrophobic and superoleophobic properties. Strict process control ensures the uniformity and density of the coating during preparation. Regarding antibacterial properties, the superhydrophobic and superoleophobic coatings prepared in each embodiment exhibit excellent antibacterial effects. Antibacterial test results show that even after prolonged exposure, these coatings maintain highly efficient antibacterial performance, with a bacterial kill rate reaching 95.5% to 98.4%. This antibacterial effect provides new possibilities for the application of coatings and surface coatings. The micro / nano composite superhydrophobic and superoleophobic coating preparation methods provided in the above embodiments have broad application prospects and are of great significance for improving coating functionality and achieving antibacterial effects.
Claims
1. A micro- and nano-composite superamphiphobic coating, characterized in that, The components include 100-200 parts of distilled water, 1-5 parts of alkaline solution, 2-3 parts of modified silica particles, 0.1-0.5 parts of low surface energy active agent, 0.1-0.8 parts of antibacterial modifier, 2-8 parts of adhesive, and 4-10 parts of organic solvent.
2. The micro-nano composite superomniphobic coating according to claim 1, wherein, The alkaline solution is ammonia water.
3. The micro-nano composite superomniphobic coating according to claim 1, wherein, The modified silica particles have a particle size of 15-300 nm.
4. The micro-nano composite superomniphobic coating according to claim 3, wherein, The low surface energy active agent is fluorinated siloxane surfactant; and the antibacterial modifier is one or both of trimethyl [3- (triethoxysilyl) propyl] ammonium chloride and dimethyl octadecyl [3- (trimethoxysilyl) propyl] ammonium chloride.
5. The micro-nano composite superomniphobic coating according to claim 4, wherein, The fluorinated siloxane surfactant is one or both of 1H, 1H, 2H, 2H- perfluorooctyl triethoxysilane and 1H, 1H, 2H, 2H- perfluorodecyl triethoxysilane, with a mixing mass ratio of 1:
2.
6. The micro-nano composite superomniphobic coating according to claim 4, wherein, The adhesive is a composite solution of polyether sulfone and polyvinylidene fluoride, with a solid content of 30-40%, a curing temperature of 200-260°C, and a mixing mass ratio of polyether sulfone to polyvinylidene fluoride of 1:1-1:
5.
7. The micro-nano composite superomniphobic coating according to claim 4, wherein, The organic solvent is a composite of at least two of anhydrous ethanol, ethyl acetate, butyl acetate, and toluene; the composite mass ratio of ethyl acetate to anhydrous ethanol is 1:3; and the mixing mass ratio of polyether sulfone to polyvinylidene fluoride is 1:3.
5.
8. A method for preparing a micro- and nano-composite super-biphobic coating, characterized in that, The implementation is specifically performed according to the following steps: Step 1, the raw material components are weighed according to the ratio; The raw material components include, by weight, 100-200 parts of distilled water, 1-5 parts of alkaline solution, 2-3 parts of modified silica particles, 0.1-0.5 parts of low surface energy active agent, 0.1-0.8 parts of antibacterial modifier, 2-8 parts of adhesive, and 4-10 parts of organic solvent. Step 2, the distilled water, alkaline solution, and modified silica nanoparticles are mixed under magnetic stirring at room temperature, and a silicon solution is obtained after uniform mixing; Step 3, the low surface energy active agent and antibacterial modifier are added to the silicon solution uniformly mixed in Step 2, and an organic super-amphiphobic coating is obtained after drying; Step 4, the adhesive and organic solvent are added to the organic super-amphiphobic coating in Step 3, and mixed uniformly at room temperature; Step 5, the coating prepared in Step 4 is uniformly coated on a cleaned and oil-removed substrate by immersion coating, spraying, blade coating, or spin coating, and then cured.
9. The method of claim 8, wherein the micro- and nano-composite superamphiphobic coating is prepared by, The drying temperature in Step 3 is 60°C, and the drying time is 6 hours.
10. The method of claim 8, wherein the micro-nano composite super-amphiphobic coating is prepared by the steps of: The substrate in Step 5 is selected from any one of carbon steel, stainless steel, aluminum, and glass; the curing temperature is 200-260°C, and the curing time is 30-60 minutes.