Super-hydrophobic aluminum foil and preparation method thereof
By forming a polydopamine layer on the surface of aluminum foil and loading porous substrate particles, and then grafting modified silicone resin, the problem of weak adhesion of superhydrophobic aluminum foil coating was solved, and a multilayer structure with high durability and hydrophobicity was achieved.
Patent Information
- Application Number
- CN202510964579.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2025-11-07
AI Technical Summary
Existing superhydrophobic aluminum foils have weak coating adhesion, resulting in poor durability and short-lasting superhydrophobicity.
A polydopamine layer is formed on the surface of aluminum foil, then porous substrate particles are loaded and linked to thiol groups through Michael addition reaction. Finally, modified silicone resin is grafted onto the surface of the substrate particles to form a multilayer structure.
The hydrophobicity and durability of the superhydrophobic aluminum foil are improved, and the multi-layer structure enhances adhesion and abrasion resistance.
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of hydrophobic aluminum foil, and particularly relates to a super-hydrophobic aluminum foil and a preparation method thereof. BACKGROUND
[0002] The super-hydrophobic aluminum foil has important application value in wax product drying machines and sewage treatment equipment due to its unique surface characteristics. The light foil treated on the surface can improve the heat exchange performance and service life of the machine. In the prior art, the super-hydrophobic aluminum foil is prepared by a wet chemical etching method, an electrochemical method, a coating method and the like. The wet chemical etching method usually uses hydrochloric acid solution or sodium hydroxide solution for etching. The reaction is relatively violent and difficult to control, and the penetration phenomenon is prone to occur at the defect site. The electrochemical method is to perform an electrochemical anodic oxidation reaction on the surface of the aluminum foil. The super-hydrophobic surface can be prepared only after a sandblasting, plasma and other pretreatment processes. The process is relatively complex and the energy consumption is high. The coating method has the advantages of not damaging the substrate, simple process and high efficiency, and becomes the main technical means for producing the super-hydrophobic aluminum foil. However, the light foil surface is relatively smooth. There are often problems of weak bonding force between the super-hydrophobic coating and the light foil and poor durability of the coating, which leads to the destruction or peeling of the super-hydrophobic coating and the loss of super-hydrophobicity.
[0003] Therefore, how to prepare a super-hydrophobic aluminum foil with good durability and long-lasting hydrophobicity is a technical problem to be solved at present. SUMMARY
[0004] The application aims to provide a super-hydrophobic aluminum foil and a preparation method thereof. First, a polydopamine layer is formed on the surface of the aluminum light foil by using dopamine self-polymerization. Then, the porous substrate particles containing thiol groups are loaded onto the surface of the polydopamine layer through Michael addition reaction to form a substrate particle layer. Finally, the amino group in the substrate particle layer and the epoxy group in the modified silicone resin are subjected to ring-opening reaction to form a modified silicone resin layer after curing. The super-hydrophobic aluminum foil with good durability is obtained through the compounding of multiple functional layers, and the problems in the background art are solved.
[0005] The object of the application can be achieved by the following technical solutions. A preparation method of a super-hydrophobic aluminum foil, comprising the following steps: Step S1, immerse the aluminum light foil in a dopamine solution and slowly shake overnight. After taking out, wash with deionized water and ethanol alternately, and dry in a 40℃ drying oven to obtain a surface-modified aluminum foil with a polydopamine layer; Step S2, the substrate particles are added into a trihydroxy amino methane aqueous solution with pH of 10 and ultrasonically dispersed for 10-15 min, then the surface modified aluminum foil is added, and the reaction is slowly stirred at room temperature for 6 h. Under the alkaline condition, the mercapto groups on the surface of the substrate particles and the quinone groups in the surface modified aluminum foil undergo Michael addition reaction to form stable C-S covalent bond, thereby obtaining the substrate loaded aluminum foil; Step S3, the substrate loaded aluminum foil is soaked in a modified silicone resin solution at 55-65℃ for 4-5 h, then taken out and washed with ethanol, and dried and cured at 165-170℃ for 2 min to obtain the super-hydrophobic aluminum foil. During the soaking process, the amino groups in the substrate loaded aluminum foil and the epoxy groups in the modified silicone resin undergo ring-opening reaction, thereby grafting the modified silicone resin onto the surface of the substrate loaded aluminum foil.
[0006] Further, the concentration of the dopamine solution is 1 mg / mL, and the solvent is a Tris-HCl buffer solution with pH of 7-9 and concentration of 10 mM.
[0007] Further, the ratio of the amount of the substrate particles to the amount of the trihydroxy amino methane aqueous solution is 4 g:200 mL.
[0008] Further, the substrate particles are prepared by the following method: The dodecyl trimethyl ammonium chloride, triethanolamine and sodium salicylate are added into deionized water and stirred to dissolve, then tetraethyl orthosilicate is added, and the reaction is stirred at 80℃ for 2 h, then γ-mercaptopropyl trimethoxysilane (KH590) and γ-aminopropyl triethoxysilane (KH550) are added dropwise, and the reaction is continuously stirred for 2 h. After the reaction is completed, the lower solid particles are collected by centrifugal separation, washed with an ethanol solution and deionized water, and dried in a vacuum drying oven at 120℃ for 12 h to obtain the substrate particles. The dodecyl trimethyl ammonium chloride is used as a template agent, the sodium salicylate is used as an auxiliary agent, and the hydrothermal reaction is carried out under weak alkaline condition to obtain nano-silica particles with porous structure. Then, the KH590 and KH550 are added to co-condense with the nano-silica particles to obtain the substrate particles containing mercapto groups and amino groups on the surface.
[0009] Further, the ratio of the amount of the dodecyl trimethyl ammonium chloride, triethanolamine, sodium salicylate, deionized water, tetraethyl orthosilicate, KH590 and KH550 is 1 g:1.4 g:0.2-0.3 g:50 mL:8-9 g:2 g:2 g.
[0010] Further, the modified silicone resin solution is a mixture of modified silicone resin and ethyl acetate with a ratio of 8-12 g / 100 mL.
[0011] Further, the modified silicone resin is prepared by the following steps: Step A1, phenyltriethoxysilane, octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane and methyltriethoxysilane are added into toluene and stirred to mix uniformly, then a solid acid catalyst is added while heating to 65-75℃, then a 90wt% ethanol aqueous solution is slowly added dropwise, then hexamethyldisiloxane and tetramethyl disiloxane are added, and the reaction is continued for 2h, then the solid acid catalyst is filtered out, and the solvent and unreacted low-boiling substances are removed by distillation under reduced pressure to obtain an active hydrogen phenyl silicone resin; phenyltriethoxysilane, octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane and methyltriethoxysilane undergo hydrolysis and polycondensation under the action of a solid acid catalyst and heating, and after the reaction, hexamethyldisiloxane and tetramethyl disiloxane are used for end-capping to obtain an active hydrogen phenyl silicone resin containing a silicon-hydrogen bond; Step A2, 120g of the active hydrogen phenyl silicone resin, 8-10g of 1-hexadecene, 4-4.5g of allyl glycidyl ether and 10mg of chloroplatinic acid are added into 35mL of isopropyl alcohol, heated to 80℃ under nitrogen protection and stirred to react for 3-5h, and then the solvent and unreacted low-boiling substances are removed by distillation under reduced pressure to obtain a modified silicone resin; the silicon-hydrogen bond in the active hydrogen phenyl silicone resin reacts with the double bonds of 1-hexadecene and allyl glycidyl ether to add long carbon chain alkyl and epoxy groups to the silicone resin.
[0012] Further, the use amount ratio of the phenyltriethoxysilane, octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane, methyltriethoxysilane, toluene, solid acid catalyst, ethanol aqueous solution, hexamethyldisiloxane and tetramethyl disiloxane is 60g: 35-40g: 15-20g: 8-10g: 120mL: 4-5g: 40mL: 3.5-4.5g: 2.5-3g; and the solid acid catalyst is a perfluorosulfonic acid resin.
[0013] Further, the use amount ratio of the active hydrogen phenyl silicone resin, 1-hexadecene, allyl glycidyl ether, chloroplatinic acid and isopropyl alcohol is 120g: 8-10g: 4-4.5g: 10mg: 35mL.
[0014] An ultrahydrophobic aluminum foil prepared by the above preparation method, sequentially comprising a polydopamine layer, a substrate particle layer and a modified silicone resin layer.
[0015] Beneficial effects: The prepared substrate particles not only have a porous structure, but also contain abundant sulfydryl and amino groups, and the substrate particles can play a dual function of improving the hydrophobicity and durability of the super-hydrophobic aluminum foil: on the one hand, the substrate particles can improve the roughness of the surface after being loaded to the polydopamine layer, and can improve the hydrophobicity of the super-hydrophobic aluminum foil as a substrate; on the other hand, the substrate particles are connected with the polydopamine layer through the sulfydryl, and are connected with the modified silicone layer through the amino group, and the substrate particles act as a bridge for strongly connecting the two functional layers, and the porous structure is also beneficial to the physical embedding of the modified silicone, and the adhesion between the modified silicone layer and the polydopamine layer is effectively improved, thereby the durability of the super-hydrophobic aluminum foil is effectively improved; The prepared modified silicone contains long-chain alkyl, phenyl and epoxy groups, the long-chain alkyl as the main part of the modified silicone plays a main influence on the hydrophobicity of the super-hydrophobic aluminum foil; the phenyl can improve the wear resistance of the modified silicone layer through π-π stacking, and the short-chain phenyl interacts with the long-chain alkyl to form a cross-linked network, which constitutes a more fine micro-nano structure, and further improves the hydrophobicity of the aluminum foil. The present application improves the adhesion between the subsequent material and the aluminum foil by immersing the aluminum foil in the dopamine solution to form a polydopamine layer on the surface of the aluminum foil, then loads the porous substrate particles on the surface of the polydopamine layer, and finally grafts the modified silicone on the surface of the substrate particles to form a modified silicone hydrophobic layer, thereby a multi-layer super-hydrophobic aluminum foil with excellent hydrophobicity and durability is obtained. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0017] Embodiment 1 The present embodiment provides a kind of substrate particles, which are prepared by the following method: 1g of dodecyltrimethylammonium chloride, 1.4g of triethanolamine and 0.2g of sodium salicylate are added to 50mL of deionized water and stirred to dissolve, then 8g of tetraethyl orthosilicate is added, and stirred at 80℃ for 2h, then 2g of KH590 and 2g of KH550 are added dropwise, and the stirring reaction is continued for 2h, after the reaction is completed, the lower solid is collected by centrifugal separation, washed with ethanol solution and deionized water, and dried in a vacuum drying oven at 120℃ for 12h to obtain the substrate particles.
[0018] Embodiment 2 The present embodiment provides a kind of substrate particles, which are prepared by the following method: Dissolve 1 g of dodecyltrimethylammonium chloride, 1.4 g of triethanolamine, and 0.25 g of sodium salicylate in 50 mL of deionized water, then add 8.5 g of tetraethyl orthosilicate, and stir and react at 80°C for 2 h, then add 2 g of KH590 and 2 g of KH550 dropwise, and continue to stir and react for 2 h. After the reaction is completed, centrifugally separate and collect the lower layer of solids, wash with an ethanol solution and deionized water, and dry in a vacuum drying oven at 120°C for 12 h to obtain the base particles.
[0019] Example 3 This example provides a base particle, which is prepared by the following method: Dissolve 1 g of dodecyltrimethylammonium chloride, 1.4 g of triethanolamine, and 0.25 g of sodium salicylate in 50 mL of deionized water, then add 8.5 g of tetraethyl orthosilicate, and stir and react at 80°C for 2 h, then add 2 g of KH590 and 2 g of KH550 dropwise, and continue to stir and react for 2 h. After the reaction is completed, centrifugally separate and collect the lower layer of solids, wash with an ethanol solution and deionized water, and dry in a vacuum drying oven at 120°C for 12 h to obtain the base particles.
[0020] Comparative Example 1 This comparative example is the same as Example 3, except that dodecyltrimethylammonium chloride and sodium salicylate are not added.
[0021] Comparative Example 2 This comparative example is the same as Example 3, except that KH590 is not added.
[0022] Comparative Example 3 This comparative example is the same as Example 3, except that KH550 is not added.
[0023] Example 4 This example provides a modified silicone solution, which is prepared by the following steps: Step A1, dissolve 60 g of phenyltriethoxysilane, 35 g of octamethylcyclotetrasiloxane, 15 g of tetramethylcyclotetrasiloxane, and 8 g of methyltriethoxysilane in 120 mL of toluene, and stir and mix until uniform, then add 4 g of perfluorosulfonic acid resin as a solid acid catalyst while heating to 65°C, then slowly add 40 mL of 90 wt% ethanol aqueous solution dropwise, then add 3.5 g of hexamethyldisiloxane and 2.5 g of tetramethyldisiloxane, continue to react for 2 h, then filter to remove the solid acid catalyst, and remove the solvent and unreacted low-boiling substances by distillation under reduced pressure to obtain an active hydrogen phenyl silicone resin. Step A2, 120 g of the active hydrogen phenyl silicone resin, 8 g of 1-hexadecene, and 4 g of allyl glycidyl ether and 10 mg of chloroplatinic acid were added to 35 mL of isopropyl alcohol, and stirred at 80°C under nitrogen protection for 3 h. The solvent and unreacted low-boiling substances were removed by distillation under reduced pressure to obtain a modified silicone resin; the modified silicone resin and ethyl acetate were mixed uniformly at a usage ratio of 8 g / 100 mL to obtain a modified silicone resin solution.
[0024] Example 5 This example provides a modified silicone resin solution, which is prepared by the following steps: Step A1, 60 g of phenyl triethoxysilane, 38 g of octamethylcyclotetrasiloxane, 17 g of tetramethylcyclotetrasiloxane, and 9 g of methyl triethoxysilane were added to 120 mL of toluene and stirred to mix uniformly, then 4.5 g of perfluorosulfonic acid resin was added as a solid acid catalyst while heating to 70°C, 40 mL of 90 wt% ethanol aqueous solution was slowly added dropwise, then 4 g of hexamethyldisiloxane and 2.8 g of tetramethyldisiloxane were added, and the reaction was continued for 2 h, after which the solid acid catalyst was removed by filtration, and the solvent and unreacted low-boiling substances were removed by distillation under reduced pressure to obtain an active hydrogen phenyl silicone resin; Step A2, 120 g of the active hydrogen phenyl silicone resin, 9 g of 1-hexadecene, and 4.2 g of allyl glycidyl ether and 10 mg of chloroplatinic acid were added to 35 mL of isopropyl alcohol, and stirred at 80°C under nitrogen protection for 4 h. The solvent and unreacted low-boiling substances were removed by distillation under reduced pressure to obtain a modified silicone resin; the modified silicone resin and ethyl acetate were mixed uniformly at a usage ratio of 10 g / 100 mL to obtain a modified silicone resin solution.
[0025] Example 6 This example provides a modified silicone resin solution, which is prepared by the following steps: Step A1, 60 g of phenyl triethoxysilane, 38 g of octamethylcyclotetrasiloxane, 17 g of tetramethylcyclotetrasiloxane, and 9 g of methyl triethoxysilane were added to 120 mL of toluene and stirred to mix uniformly, then 4.5 g of perfluorosulfonic acid resin was added as a solid acid catalyst while heating to 70°C, 40 mL of 90 wt% ethanol aqueous solution was slowly added dropwise, then 4 g of hexamethyldisiloxane and 2.8 g of tetramethyldisiloxane were added, and the reaction was continued for 2 h, after which the solid acid catalyst was removed by filtration, and the solvent and unreacted low-boiling substances were removed by distillation under reduced pressure to obtain an active hydrogen phenyl silicone resin; Step A2, 120 g of active hydrogen phenyl silicone resin, 10 g of 1-hexadecene, and 4.5 g of allyl glycidyl ether and 10 mg of chloroplatinic acid were added to 35 mL of isopropyl alcohol, and the reaction was stirred at 80°C for 5 h under nitrogen protection. The solvent and unreacted low-boiling substances were removed by distillation under reduced pressure to obtain a modified silicone resin. The modified silicone resin and ethyl acetate were mixed uniformly at a usage ratio of 12 g / 100 mL to obtain a modified silicone resin solution.
[0026] Comparative Example 4 This comparative example is compared with Example 6, except that methyl triethoxysilane is used instead of phenyl triethoxysilane in Step A1, and the rest of the raw materials and steps are the same.
[0027] Comparative Example 5 This comparative example is compared with Example 6, except that 1-hexadecene is not added in Step A2, and the rest of the raw materials and steps are the same.
[0028] Example 7 This example provides a super-hydrophobic aluminum foil, which is prepared by the following steps: Step S1, immerse the aluminum foil in a dopamine solution with a concentration of 1 mg / mL and slowly oscillate overnight, wherein the solvent of the dopamine solution is a Tris-HCl buffer with a pH of 7-9 and a concentration of 10 mM. After taking it out, wash it with deionized water and ethanol alternately, and dry it in a 40°C drying oven to obtain a surface-modified aluminum foil. Step S2, add 4 g of the substrate particles prepared in Example 1 to 200 mL of a trihydroxy aminomethane aqueous solution with a pH of 10 and ultrasonically disperse for 10-15 min, then add the surface-modified aluminum foil, and slowly stir at room temperature for 6 h to obtain a substrate-loaded aluminum foil. Step S3, immerse the substrate-loaded aluminum foil in a modified silicone resin solution at 55-65°C for 4-5 h, wherein the modified silicone resin solution is composed of 8-12 g of the modified silicone resin prepared in Example 4 and 100 mL of ethyl acetate. After taking it out, wash it with ethanol, and dry it and then solidify it at 165-170°C for 2 min to obtain a super-hydrophobic aluminum foil.
[0029] Example 8 This example provides a super-hydrophobic aluminum foil, which is prepared by the following steps: Step S1, immerse the aluminum foil in a dopamine solution with a concentration of 1 mg / mL and slowly oscillate overnight, wherein the solvent of the dopamine solution is a Tris-HCl buffer with a pH of 7-9 and a concentration of 10 mM. After taking it out, wash it with deionized water and ethanol alternately, and dry it in a 40°C drying oven to obtain a surface-modified aluminum foil. Step S2, 4g of the substrate particles prepared in Example 1 were added to 200 mL of a trihydroxyl aminomethane aqueous solution with pH of 10 and ultrasonically dispersed for 10-15 min, then the surface-modified aluminum foil was added, and the reaction was carried out at room temperature with slow stirring for 6 h to obtain the substrate-loaded aluminum foil; Step S3, the substrate-loaded aluminum foil was soaked in a modified silicone resin solution at 55-65 °C for 4-5 h, wherein the modified silicone resin solution was composed of 8-12 g of the modified silicone resin prepared in Example 4 and 100 mL of ethyl acetate, and after being taken out, it was washed with ethanol and dried, and then cured at 165-170 °C for 2 min to obtain the super-hydrophobic aluminum foil.
[0030] Example 9 The present example provides a super-hydrophobic aluminum foil, which is prepared by the following steps: Step S1, the aluminum foil was immersed in a dopamine solution with a concentration of 1 mg / mL and slowly oscillated overnight, wherein the solvent of the dopamine solution was a Tris-HCl buffer with a pH of 7-9 and a concentration of 10 mM, and after being taken out, it was washed with deionized water and ethanol alternately, and dried in a 40 °C drying oven to obtain the surface-modified aluminum foil; Step S2, 4g of the substrate particles prepared in Example 1 were added to 200 mL of a trihydroxyl aminomethane aqueous solution with pH of 10 and ultrasonically dispersed for 10-15 min, then the surface-modified aluminum foil was added, and the reaction was carried out at room temperature with slow stirring for 6 h to obtain the substrate-loaded aluminum foil; Step S3, the substrate-loaded aluminum foil was soaked in a modified silicone resin solution at 55-65 °C for 4-5 h, wherein the modified silicone resin solution was composed of 8-12 g of the modified silicone resin prepared in Example 4 and 100 mL of ethyl acetate, and after being taken out, it was washed with ethanol and dried, and then cured at 165-170 °C for 2 min to obtain the super-hydrophobic aluminum foil.
[0031] Comparative Example 6 The present comparative example is different from Example 9 in that the substrate particles prepared in Comparative Example 1 are used to replace the substrate particles prepared in Example 3 in equal amount, and the rest of the raw materials and steps are the same.
[0032] Comparative Example 7 The present comparative example is different from Example 9 in that the substrate particles prepared in Comparative Example 2 are used to replace the substrate particles prepared in Example 3 in equal amount, and the rest of the raw materials and steps are the same.
[0033] Comparative Example 8 The present comparative example is different from Example 9 in that the substrate particles prepared in Comparative Example 3 are used to replace the substrate particles prepared in Example 3 in equal amount, and the rest of the raw materials and steps are the same.
[0034] Comparative Example 9 The comparative example is compared with example 9, except that the modified silicone resin solution prepared in comparative example 4 is used to replace the modified silicone resin solution prepared in example 6, and the remaining raw materials and steps are the same.
[0035] Comparative example 10 The comparative example is compared with example 9, except that the modified silicone resin solution prepared in comparative example 5 is used to replace the modified silicone resin solution prepared in example 6, and the remaining raw materials and steps are the same.
[0036] Performance tests are carried out on examples 7-9 and comparative examples 6-10, the initial contact angle of aluminum foil with water is tested using a KSV CM20 contact angle tester; then the surface of the super-hydrophobic aluminum foil is reciprocally rubbed with 1000 grit sandpaper under a 500g load for 10 times, and the contact angle after rubbing is tested again; the test results are shown in Table 1: Table 1 Group Initial contact angle (°) Contact angle after rubbing (°) Contact angle reduction rate (%) Example 7 158.3 152.6 3.6 Example 8 158.9 153.3 3.5 Example 9 159.4 153.8 3.5 Comparative Example 6 159.3 136.2 14.5 Comparative Example 7 153.8 123.0 20 Comparative Example 8 154.5 127.0 17.8 Comparative Example 9 151.2 134.3 11.2 Comparative Example 10 138.6 132.5 4.4 As can be seen from the data in Table 1, the super-hydrophobic aluminum foil prepared in examples 7-9 has a higher initial contact angle, and still maintains a higher contact angle after rubbing treatment, with a smaller contact angle reduction rate, and has excellent hydrophobicity and durability; the super-hydrophobic aluminum foil prepared in comparative examples 6-8 lacks porous structure or chemically bonded substrate particles, and cannot form good interaction with the modified silicone resin, resulting in poor adhesion of the modified silicone resin layer, which is easy to break and fall off, resulting in poor durability; the super-hydrophobic aluminum foils prepared in comparative examples 9-10 respectively lack phenyl and long-chain alkyl, resulting in poor hydrophobicity of the modified silicone resin coating formed, and the durability is also affected.
[0037] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0038] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A method for preparing a superhydrophobic aluminum foil, characterized by, The method comprises the following steps: Step S1, the aluminum foil is immersed in a dopamine solution and oscillated overnight, then taken out and washed with deionized water and ethanol alternately, and dried to obtain a surface-modified aluminum foil; Step S2, the substrate particles are added into a tris-hydroxyl amino methane aqueous solution with a pH of 10 and ultrasonically dispersed uniformly, then the surface-modified aluminum foil is added, and stirred at room temperature for 6 hours to obtain a substrate-loaded aluminum foil; Step S3, the substrate-loaded aluminum foil is immersed in a modified silicone resin solution at 55-65℃ for 4-5 hours, then taken out and washed with ethanol, dried, and cured at 165-170℃ for 2 minutes to obtain a super-hydrophobic aluminum foil.
2. The method for preparing a superhydrophobic aluminum foil according to claim 1, characterized in that, The dopamine solution has a concentration of 1 mg / mL, and a Tris-HCl buffer solution with a pH of 7-9 and a concentration of 10 mM is used as a solvent.
3. The method for preparing a superhydrophobic aluminum foil according to claim 1, characterized in that, The substrate particles and the tris-hydroxyl amino methane aqueous solution are used in a ratio of 4 g:200 mL.
4. The method for preparing a superhydrophobic aluminum foil according to claim 1, characterized in that, The substrate particles are prepared by the following method: The dodecyl trimethyl ammonium chloride, triethanolamine, sodium salicylate and deionized water are stirred and dissolved, then tetraethyl orthosilicate is added, and stirred and reacted at 80℃ for 2 hours, then KH590 and KH550 are added dropwise, and stirred and reacted for another 2 hours, after the reaction, the lower layer is collected by centrifugal separation, washed with an ethanol solution and deionized water, and dried in vacuum to obtain the substrate particles.
5. The method of claim 4, wherein the method further comprises the step of applying a second layer of the hydrophobic material on the first layer of the hydrophobic material. The dodecyl trimethyl ammonium chloride, triethanolamine, sodium salicylate, deionized water, tetraethyl orthosilicate, KH590 and KH550 are used in a ratio of 1 g:1.4 g:0.2-0.3 g:50 mL:8-9 g:2 g:2 g.
6. The method for preparing a superhydrophobic aluminum foil according to claim 1, characterized in that, The modified silicone resin solution is prepared by mixing modified silicone resin and ethyl acetate in a ratio of 8-12 g / 100 mL.
7. The method of claim 6, wherein the method further comprises the step of applying a second layer of the hydrophobic material on the first layer of the hydrophobic material. The modified silicone resin is prepared by the following steps: Step A1, phenyl triethoxysilane, octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane and methyl triethoxysilane are added into toluene and stirred and mixed uniformly, then a solid acid catalyst is added while heating to 65-75℃, then a 90wt% ethanol aqueous solution is slowly added dropwise, then hexamethyldisiloxane and tetramethyldisiloxane are added, and after continued heat preservation for 2 hours, the solid acid catalyst is removed by filtration, and the solvent and unreacted low-boiling substances are removed by distillation under reduced pressure to obtain an active hydrogen phenyl silicone resin; Step A2, 120 g of the active hydrogen phenyl silicone resin, 8-10 g of 1-hexadecene, 4-4.5 g of allyl glycidyl ether and 10 mg of chloroplatinic acid are added into 35 mL of isopropyl alcohol, heated to 80℃ under nitrogen protection, and stirred and reacted for 3-5 hours, then the solvent and unreacted low-boiling substances are removed by distillation under reduced pressure to obtain a modified silicone resin.
8. The method of claim 7, wherein the method further comprises the step of applying a second layer of the hydrophobic material on the first layer of the hydrophobic material. The phenyl triethoxysilane, octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane, methyl triethoxysilane, toluene, solid acid catalyst, ethanol aqueous solution, hexamethyldisiloxane and tetramethyldisiloxane are used in a ratio of 60 g:35-40 g:15-20 g:8-10 g:120 mL:4-5 g:40 mL:3.5-4.5 g:2.5-3 g; and the solid acid catalyst is a perfluorosulfonic acid resin.
9. The method for preparing a superhydrophobic aluminum foil according to claim 7, characterized in that, The active hydrogen phenyl silicone resin, 1-hexadecene, allyl glycidyl ether, chloroplatinic acid and isopropyl alcohol are used in a ratio of 120 g:8-10 g:4-4.5 g:10 mg:35 mL.
10. A superhydrophobic aluminum foil, characterized by, prepared by the process of any one of claims 1-9.