Modified self-cleaning aluminum sheet and method for manufacturing the same

Abstract

The application relates to a preparation method of a modified self-cleaning aluminum sheet, which comprises the following steps: preheating a sheet substrate at 55-60 DEG C for 1 h, then immersing the preheated sheet substrate into a self-prepared coating liquid, standing for 2-3 h, taking out after the immersion is completed, drying at room temperature for 12 h, and thus the modified self-cleaning aluminum sheet is obtained. The self-cleaning aluminum sheet is preheated, and the self-prepared coating liquid is improved and optimized, so that the impact resistance, self-cleaning and adhesion of the aluminum sheet coating are coordinately improved, and the ultraviolet resistance and cold-heat resistance stability of the product are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum sheet technology, specifically to a modified self-cleaning aluminum sheet and its preparation method. Background Technology

[0002] Aluminum products are a general term for household and industrial products made primarily from aluminum alloys. Aluminum alloys have low density but high strength, approaching or exceeding that of high-quality steel, and good plasticity, allowing them to be processed into various profiles. Existing aluminum sheet products have a coating applied to their surface to optimize functionality. However, the coating has poor self-cleaning properties, poor adhesion between the coating and the sheet, and low impact resistance, making it difficult to achieve improvements in self-cleaning, adhesion, and impact resistance. Furthermore, the products have poor UV resistance and thermal stability, limiting their usability. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a modified self-cleaning aluminum sheet and its preparation method, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] This invention provides a method for preparing a modified self-cleaning aluminum sheet, comprising the following steps:

[0006] The thin plate substrate is preheated at 55-60℃ for 1 hour, then immersed in the self-made coating liquid and left to stand for 2-3 hours. After immersion, it is taken out and dried at room temperature for 12 hours to obtain the modified self-cleaning aluminum thin plate of the present invention.

[0007] The preparation method of the self-made coating solution is as follows:

[0008] Weigh the raw materials according to the following proportions by weight: add 40-45 parts of polyurethane resin and 10-15 parts of epoxy resin to 35 parts of solvent, stir at 65℃ for 1-2 hours at a stirring speed of 350-400 r / min, then add 8-11 parts of modified filler, 3-5 parts of functional additives, 6-8 parts of curing agent, and 2-3 parts of silane coupling agent KH560, and continue stirring for 2 hours at a stirring speed of 200-230 r / min. After stirring is completed, the self-made coating liquid is obtained.

[0009] Preferably, the polyurethane resin is a thermoplastic polyurethane with a hydroxyl value of 10-20 mg KOH / g, a glass transition temperature of 45-60°C, and a molecular weight of 15000-25000; the epoxy resin is E12 epoxy resin; the solvent is n-butyl acetate; the curing agent is m-phenylenediamine; and the solvent is propylene glycol methyl ether acetate.

[0010] Preferably, the modified filler is prepared by:

[0011] S01: Mix 3-5 parts of silica powder, 1-2 parts of calcium dodecyl sulfate and 2-4 parts of Tris-HCl buffer solution thoroughly to obtain silica powder solution;

[0012] Calcium sulfate whiskers, hydrotalcite and sodium silicate solution were thoroughly mixed in a weight ratio of (3-5):2:(4-6) to obtain whisker-modified solution;

[0013] S02: Whisker modification liquid and silicon micro powder liquid are ultrasonically treated at a weight ratio of (4-7):3 to obtain filler modification liquid;

[0014] S03: The cordierite-clay body and the filler modification liquid were mixed at a weight ratio of 5:3 and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling was completed, the mixture was filtered and dried to obtain the modified filler agent.

[0015] Preferably, the pH of the Tris-HCl buffer solution is 8.0-9.0; and the mass fraction of the sodium silicate solution is 2-5%.

[0016] Preferably, the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 20-30 minutes.

[0017] Preferably, the preparation method of the cordierite-clay body is as follows:

[0018] Cordierite was first stirred thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered, and dried. 5-8 parts of dried cordierite, 2-4 parts of barium carbonate, and 2-3 parts of clay were mixed and added to 5-8 parts of lanthanum chloride solution, followed by 1-2 parts of urea solution. The mixture was stirred until the stirring was finished, then filtered and dried to obtain cordierite-clay body.

[0019] Preferably, the lanthanum chloride solution has a mass fraction of 2-5%; the urea solution has a mass fraction of 4-6%; the stirring temperature is 50-55℃, the stirring speed is 550-650 r / min, and the stirring time is 1 h.

[0020] Preferably, the preparation method of the functional additive is as follows:

[0021] S11: Preheat the nano-mica powder at 60-70℃ for 2 hours, add the preheated nano-mica powder to a 5% sodium dodecylbenzenesulfonate solution with a mass fraction of 3-5 times the total amount of nano-mica powder, and stir evenly to obtain nano-mica liquid.

[0022] S12: Mix 2-3 parts of silver nanowires, 1-3 parts of sodium carboxymethyl cellulose, 5-8 parts of yttrium nitrate solution, and 2-4 parts of nano-calcium carbonate thoroughly to obtain silver nanowire agent;

[0023] S13: 4-6 parts of nano-mica liquid and 5-8 parts of silver nanowire agent are mixed and ball-milled at a speed of 1000-1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the functional additive.

[0024] Preferably, the yttrium nitrate solution has a mass fraction of 2-5%.

[0025] The present invention also provides a method for preparing a modified self-cleaning aluminum sheet, which produces a modified self-cleaning aluminum sheet.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The self-cleaning aluminum sheet of this invention uses a preheated thin sheet substrate, combined with a self-made coating liquid for improvement and optimization. The resulting aluminum sheet coating achieves coordinated improvement in impact resistance, self-cleaning and adhesion, while the product also shows significant UV resistance and cold and heat stability.

[0028] The polyurethane resin in the self-made coating solution is blended with epoxy resin, modified fillers, and functional additives. The addition of curing agents and silane coupling agents further optimizes and improves product performance. The cordierite-clay body in the modified filler, combined with the filler modification liquid, optimizes the product system performance. The cordierite-clay body is made by treating cordierite with potassium permanganate solution to optimize its activity. It is further combined with barium carbonate, clay, lanthanum chloride solution, and urea solution. Through the synergistic effect of the raw materials, the barium carbonate... Clay is incorporated into the cordierite system to enhance the stability of the cordierite-clay body in the system. Simultaneously, the filler modification liquid is used for co-concentration and optimization. The whisker modification liquid in the filler modification liquid is combined with the silica powder liquid. The silica powder liquid contains silica powder, calcium dodecyl sulfate, and Tris-HCl buffer solution. The whisker modification liquid is then prepared by blending calcium sulfate whiskers, hydrotalcite, and sodium silicate solution. Through the synergistic effect between the raw materials, the performance of the modified filler agent in the system is further improved.

[0029] The functional additives are made by preheating nano-mica powder and then blending it with sodium dodecylbenzenesulfonate solution to optimize the dispersion of nano-mica powder. At the same time, the dispersion is further improved by ball milling silver nanowires. The silver nanowires, sodium carboxymethyl cellulose, yttrium nitrate solution, and nano-calcium carbonate in the silver nanowires are blended and improved. The silver nanowires, as a linear structure, work together with nano-mica powder and the blending of raw materials to further enhance the performance of the system, thereby further improving the performance of the product. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only 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 are within the scope of protection of the present invention.

[0031] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, comprising the following steps:

[0032] The thin plate substrate is preheated at 55-60℃ for 1 hour, then immersed in the self-made coating liquid and left to stand for 2-3 hours. After immersion, it is taken out and dried at room temperature for 12 hours to obtain the modified self-cleaning aluminum thin plate of the present invention.

[0033] The preparation method of the self-made coating solution is as follows:

[0034] Weigh the raw materials according to the following proportions by weight: add 40-45 parts of polyurethane resin and 10-15 parts of epoxy resin to 35 parts of solvent, stir at 65℃ for 1-2 hours at a stirring speed of 350-400 r / min, then add 8-11 parts of modified filler, 3-5 parts of functional additives, 6-8 parts of curing agent, and 2-3 parts of silane coupling agent KH560, and continue stirring for 2 hours at a stirring speed of 200-230 r / min. After stirring is completed, the self-made coating liquid is obtained.

[0035] The polyurethane resin in this embodiment is a thermoplastic polyurethane with a hydroxyl value of 10-20 mg KOH / g, a glass transition temperature of 45-60°C, and a molecular weight of 15000-25000; the epoxy resin is E12 epoxy resin; the solvent is n-butyl acetate; the curing agent is m-phenylenediamine; and the solvent is propylene glycol methyl ether acetate.

[0036] The preparation method of the modified filler in this embodiment is as follows:

[0037] S01: Mix 3-5 parts of silica powder, 1-2 parts of calcium dodecyl sulfate and 2-4 parts of Tris-HCl buffer solution thoroughly to obtain silica powder solution;

[0038] Calcium sulfate whiskers, hydrotalcite and sodium silicate solution were thoroughly mixed in a weight ratio of (3-5):2:(4-6) to obtain whisker-modified solution;

[0039] S02: Whisker modification liquid and silicon micro powder liquid are ultrasonically treated at a weight ratio of (4-7):3 to obtain filler modification liquid;

[0040] S03: The cordierite-clay body and the filler modification liquid were mixed at a weight ratio of 5:3 and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling was completed, the mixture was filtered and dried to obtain the modified filler agent.

[0041] The pH of the Tris-HCl buffer solution in this embodiment is 8.0-9.0; the mass fraction of the sodium silicate solution is 2-5%.

[0042] In this embodiment, the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 20-30 minutes.

[0043] The preparation method of the cordierite-clay body in this embodiment is as follows:

[0044] Cordierite was first stirred thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered, and dried. 5-8 parts of dried cordierite, 2-4 parts of barium carbonate, and 2-3 parts of clay were mixed and added to 5-8 parts of lanthanum chloride solution, followed by 1-2 parts of urea solution. The mixture was stirred until the stirring was finished, then filtered and dried to obtain cordierite-clay body.

[0045] In this embodiment, the lanthanum chloride solution has a mass fraction of 2-5%; the urea solution has a mass fraction of 4-6%; the stirring temperature is 50-55℃, the stirring speed is 550-650 r / min, and the stirring time is 1 h.

[0046] The preparation method of the functional additive in this embodiment is as follows:

[0047] S11: Preheat the nano-mica powder at 60-70℃ for 2 hours, add the preheated nano-mica powder to a 5% sodium dodecylbenzenesulfonate solution with a mass fraction of 3-5 times the total amount of nano-mica powder, and stir evenly to obtain nano-mica liquid.

[0048] S12: Mix 2-3 parts of silver nanowires, 1-3 parts of sodium carboxymethyl cellulose, 5-8 parts of yttrium nitrate solution, and 2-4 parts of nano-calcium carbonate thoroughly to obtain silver nanowire agent;

[0049] S13: 4-6 parts of nano-mica liquid and 5-8 parts of silver nanowire agent are mixed and ball-milled at a speed of 1000-1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the functional additive.

[0050] The mass fraction of the yttrium nitrate solution in this embodiment is 2-5%.

[0051] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, which produces the modified self-cleaning aluminum sheet.

[0052] Example 1.

[0053] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, comprising the following steps:

[0054] The thin plate substrate is preheated at 55°C for 1 hour, then immersed in the self-made coating liquid and left to stand for 2 hours. After immersion, it is taken out and dried at room temperature for 12 hours to obtain the modified self-cleaning aluminum thin plate of the present invention.

[0055] The preparation method of the self-made coating solution is as follows:

[0056] Weigh the raw materials according to the following proportions by weight: add 40 parts of polyurethane resin and 10 parts of epoxy resin to 35 parts of solvent, stir at 65℃ for 1-2 hours at a stirring speed of 350 r / min, then add 8 parts of modified filler, 3 parts of functional additives, 6 parts of curing agent and 2 parts of silane coupling agent KH560, continue stirring for 2 hours at a stirring speed of 200 r / min, and after stirring is completed, the self-made coating liquid is obtained.

[0057] In this embodiment, the polyurethane resin is a thermoplastic polyurethane with a hydroxyl value of 10 mg KOH / g, a glass transition temperature of 45°C, and a molecular weight of 15000; the epoxy resin is E12 epoxy resin; the solvent is n-butyl acetate; the curing agent is m-phenylenediamine; and the solvent is propylene glycol methyl ether acetate.

[0058] The preparation method of the modified filler in this embodiment is as follows:

[0059] S01: Mix 3 parts of silica powder, 1 part of calcium dodecyl sulfate and 2 parts of Tris-HCl buffer solution thoroughly to obtain silica powder solution;

[0060] Calcium sulfate whiskers, hydrotalcite and sodium silicate solution were thoroughly mixed in a weight ratio of 3:2:4 to obtain whisker-modified solution.

[0061] S02: Whisker modification liquid and silicon micro powder liquid are ultrasonically treated at a weight ratio of 4:3 to obtain filler modification liquid;

[0062] S03: The cordierite-clay body and the filler modification liquid were mixed at a weight ratio of 5:3 and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling was completed, the mixture was filtered and dried to obtain the modified filler agent.

[0063] The pH of the Tris-HCl buffer solution in this embodiment is 8.0; the mass fraction of the sodium silicate solution is 2%.

[0064] In this embodiment, the ultrasonic power for ultrasonic treatment is 350W, and the ultrasonic treatment lasts for 20 minutes.

[0065] The preparation method of the cordierite-clay body in this embodiment is as follows:

[0066] Cordierite was first stirred thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered, and dried. Five parts of dried cordierite, two parts of barium carbonate, and two parts of clay were mixed and added to five parts of lanthanum chloride solution, followed by one part of urea solution. The mixture was stirred until the stirring was finished, then filtered and dried to obtain cordierite-clay body.

[0067] In this embodiment, the lanthanum chloride solution has a mass fraction of 2%; the urea solution has a mass fraction of 4%; the stirring temperature is 50°C, the stirring speed is 550 r / min, and the stirring time is 1 h.

[0068] The preparation method of the functional additive in this embodiment is as follows:

[0069] S11: Preheat the nano-mica powder at 60℃ for 2 hours, add the preheated nano-mica powder to a 5% sodium dodecylbenzenesulfonate solution (3 times the total amount of nano-mica powder) and stir until homogeneous to obtain nano-mica liquid.

[0070] S12: Mix 2 parts silver nanowires, 1 part sodium carboxymethyl cellulose, 5 parts yttrium nitrate solution and 2 parts nano-calcium carbonate thoroughly to obtain silver nanowire agent;

[0071] S13: 4 parts of nano-mica liquid and 5 parts of silver nanowire agent were mixed and ball-milled at a speed of 1000 r / min for 2 h. After ball milling, the mixture was filtered and dried to obtain the functional additive.

[0072] The mass fraction of the yttrium nitrate solution in this embodiment is 2%.

[0073] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, which produces the modified self-cleaning aluminum sheet.

[0074] Example 2.

[0075] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, comprising the following steps:

[0076] The thin plate substrate is preheated at 60°C for 1 hour, then immersed in the self-made coating liquid and left to stand for 3 hours. After immersion, it is taken out and dried at room temperature for 12 hours to obtain the modified self-cleaning aluminum thin plate of the present invention.

[0077] The preparation method of the self-made coating solution is as follows:

[0078] Weigh the raw materials according to the following parts by weight: add 45 parts of polyurethane resin and 15 parts of epoxy resin to 35 parts of solvent, stir at 65°C for 2 hours at a stirring speed of 400 r / min, then add 11 parts of modified filler, 5 parts of functional additives, 8 parts of curing agent and 3 parts of silane coupling agent KH560, and continue stirring for 2 hours at a stirring speed of 230 r / min. After stirring is completed, the self-made coating liquid is obtained.

[0079] In this embodiment, the polyurethane resin is a thermoplastic polyurethane with a hydroxyl value of 20 mg KOH / g, a glass transition temperature of 60°C, and a molecular weight of 25,000; the epoxy resin is E12 epoxy resin; the solvent is n-butyl acetate; the curing agent is m-phenylenediamine; and the solvent is propylene glycol methyl ether acetate.

[0080] The preparation method of the modified filler in this embodiment is as follows:

[0081] S01: Mix 5 parts of silica powder, 2 parts of calcium dodecyl sulfate and 4 parts of Tris-HCl buffer solution thoroughly to obtain silica powder solution;

[0082] Calcium sulfate whiskers, hydrotalcite and sodium silicate solution were thoroughly mixed in a weight ratio of 5:2:6 to obtain whisker-modified solution.

[0083] S02: Whisker modification liquid and silicon micro powder liquid are ultrasonically treated at a weight ratio of 7:3 to obtain filler modification liquid;

[0084] S03: The cordierite-clay body and the filler modification liquid were mixed at a weight ratio of 5:3 and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling was completed, the mixture was filtered and dried to obtain the modified filler agent.

[0085] The pH of the Tris-HCl buffer solution in this embodiment is 9.0; the mass fraction of the sodium silicate solution is 5%.

[0086] In this embodiment, the ultrasonic power for ultrasonic treatment is 400W, and the ultrasonic treatment lasts for 30 minutes.

[0087] The preparation method of the cordierite-clay body in this embodiment is as follows:

[0088] Cordierite was first stirred thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered, and dried. Eight parts of dried cordierite, four parts of barium carbonate, and three parts of clay were mixed and added to eight parts of lanthanum chloride solution, followed by two parts of urea solution. The mixture was stirred until the stirring was finished, then filtered and dried to obtain cordierite-clay body.

[0089] In this embodiment, the lanthanum chloride solution has a mass fraction of 5%; the urea solution has a mass fraction of 6%; the stirring temperature is 55°C, the stirring speed is 650 r / min, and the stirring time is 1 h.

[0090] The preparation method of the functional additive in this embodiment is as follows:

[0091] S11: Preheat the nano-mica powder at 70℃ for 2 hours, add the preheated nano-mica powder to a 5% sodium dodecylbenzenesulfonate solution (5 times the total amount of nano-mica powder) and stir until homogeneous to obtain nano-mica liquid.

[0092] S12: Mix 3 parts silver nanowires, 3 parts sodium carboxymethyl cellulose, 8 parts yttrium nitrate solution and 4 parts nano-calcium carbonate thoroughly to obtain silver nanowire agent;

[0093] S13: 6 parts of nano-mica liquid and 8 parts of silver nanowire agent were mixed and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture was filtered and dried to obtain the functional additive.

[0094] The yttrium nitrate solution in this embodiment has a mass fraction of 5%.

[0095] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, which produces the modified self-cleaning aluminum sheet.

[0096] Example 3.

[0097] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, comprising the following steps:

[0098] The thin plate substrate is preheated at 57.5°C for 1 hour, and then immersed in the self-made coating solution. After standing for 2-3 hours, the substrate is removed and dried at room temperature for 12 hours to obtain the modified self-cleaning aluminum thin plate of the present invention.

[0099] The preparation method of the self-made coating solution is as follows:

[0100] Weigh the raw materials according to the following parts by weight: add 42.5 parts of polyurethane resin and 12.5 parts of epoxy resin to 35 parts of solvent, stir at 65°C for 1.5 hours at a stirring speed of 375 r / min, then add 10 parts of modified filler, 4 parts of functional additives, 7 parts of curing agent and 2.5 parts of silane coupling agent KH560, and continue stirring for 2 hours at a stirring speed of 210 r / min. After stirring is completed, the self-made coating liquid is obtained.

[0101] In this embodiment, the polyurethane resin is a thermoplastic polyurethane with a hydroxyl value of 15 mg KOH / g, a glass transition temperature of 50°C, and a molecular weight of 20,000; the epoxy resin is E12 epoxy resin; the solvent is n-butyl acetate; the curing agent is m-phenylenediamine; and the solvent is propylene glycol methyl ether acetate.

[0102] The preparation method of the modified filler in this embodiment is as follows:

[0103] S01: Mix 4 parts of silica powder, 1.5 parts of calcium dodecyl sulfate and 3 parts of Tris-HCl buffer solution thoroughly to obtain silica powder solution;

[0104] Calcium sulfate whiskers, hydrotalcite and sodium silicate solution were thoroughly mixed in a weight ratio of 4:2:5 to obtain whisker-modified solution.

[0105] S02: Whisker modification liquid and silicon micro powder liquid are ultrasonically treated at a weight ratio of 5.5:3 to obtain filler modification liquid;

[0106] S03: The cordierite-clay body and the filler modification liquid were mixed at a weight ratio of 5:3 and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling was completed, the mixture was filtered and dried to obtain the modified filler agent.

[0107] The pH of the Tris-HCl buffer solution in this embodiment is 8.5; the mass fraction of the sodium silicate solution is 3.5%.

[0108] In this embodiment, the ultrasonic power for ultrasonic treatment is 375W, and the ultrasonic treatment lasts for 25 minutes.

[0109] The preparation method of the cordierite-clay body in this embodiment is as follows:

[0110] Cordierite was first stirred thoroughly in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered, and dried. 6.5 parts of dried cordierite, 3 parts of barium carbonate, and 2.5 parts of clay were mixed and added to 6.5 parts of lanthanum chloride solution, followed by 1.5 parts of urea solution. The mixture was stirred until the stirring was complete, then filtered and dried to obtain the cordierite-clay body.

[0111] In this embodiment, the lanthanum chloride solution has a mass fraction of 3.5%; the urea solution has a mass fraction of 5%; the stirring temperature is 52.5℃, the stirring speed is 600 r / min, and the stirring time is 1 h.

[0112] The preparation method of the functional additive in this embodiment is as follows:

[0113] S11: Preheat the nano-mica powder at 65℃ for 2 hours, add the preheated nano-mica powder to a 5% sodium dodecylbenzenesulfonate solution (4 times the total amount of nano-mica powder) and stir until homogeneous to obtain nano-mica liquid.

[0114] S12: 2.5 parts silver nanowires, 2 parts sodium carboxymethyl cellulose, 6.5 parts yttrium nitrate solution, and 3 parts nano-calcium carbonate are thoroughly mixed to obtain silver nanowire agent;

[0115] S13: 5 parts of nano-mica liquid and 6.5 parts of silver nanowire agent were mixed and ball-milled at a speed of 1250 r / min for 2 h. After ball milling, the mixture was filtered and dried to obtain the functional additive.

[0116] The mass fraction of the yttrium nitrate solution in this embodiment is 3.5%.

[0117] This embodiment describes a method for preparing a modified self-cleaning aluminum sheet, which produces the modified self-cleaning aluminum sheet.

[0118] Comparative Example 1.

[0119] Unlike Example 3, no modified filler was added to the self-made coating solution.

[0120] Comparative Example 2.

[0121] Unlike Example 3, cordierite-clay body was not added to the modified filler.

[0122] Comparative Example 3.

[0123] Unlike Example 3, no filler-modifying liquid was added to the modified filler agent.

[0124] Comparative Example 4.

[0125] Unlike Example 3, no silica powder solution was added to the filler modification solution.

[0126] Comparative Example 5.

[0127] Unlike Example 3, whisker modification solution was not added to the filler modification solution.

[0128] Comparative Example 6.

[0129] Unlike Example 3, calcium sulfate whiskers and hydrotalcite were not added to the whisker modification solution.

[0130] Comparative Example 7.

[0131] Unlike Example 3, no functional additives were added.

[0132] Comparative Example 8.

[0133] Unlike Example 3, no nano-mica liquid was added in the preparation of the functional additives.

[0134] Comparative Example 9.

[0135] Unlike Example 3, no silver nanowire agent was added in the preparation of the functional additives.

[0136] Comparative Example 10.

[0137] Unlike Example 3, no silver nanowires and nano-calcium carbonate were added to the silver nanowire agent.

[0138] Performance tests were conducted on Examples 1-3 and Comparative Examples 1-10 to test self-cleaning, adhesion, and impact resistance. Simultaneously, the UV resistance and thermal stability of the products were tested (the products were subjected to 100 W / m² heat). The product was irradiated with ultraviolet light for 6 hours, then placed at 75°C for 12 hours, and then placed at -5°C for 12 hours to test its UV resistance and thermal stability. The test results are as follows.

[0139]

[0140] As can be seen from Comparative Examples 1-10 and Examples 1-3;

[0141] The product in Example 3 has excellent impact resistance, as well as excellent adhesion and water contact angle. The product's self-cleaning, adhesion, and impact resistance can be improved in a coordinated manner. In addition, the product has excellent UV resistance and cold and heat stability.

[0142] As can be seen from Comparative Examples 1-10 and Example 3, the performance of the products showed a significant downward trend when neither modified filler nor functional additives were added to the self-made coating liquid. The performance of the products was most significantly improved when both were blended and synergistically formulated. Furthermore, the performance of the products showed a downward trend when cordierite-clay body or filler-modifying liquid was not added to the modified filler. The performance of the products showed a significant downward trend when cordierite-clay body was not added. The performance of the products showed a different degree of decline when silica powder liquid, whisker-modifying liquid, calcium sulfate whiskers, or hydrotalcite were not added to the filler-modifying liquid. The modified filler prepared by combining the filler-modifying liquid obtained by the specific method of this invention with cordierite-clay body showed the most significant performance improvement.

[0143] When the preparation of functional additives does not include nano-mica liquid, silver nanowire agents, or silver nanowire agents without the addition of silver nanowires and nano-calcium carbonate, the performance of the products tends to deteriorate to varying degrees. Only the functional additives obtained by the specific method of this invention show the most significant performance effect.

[0144] Given that cordierite-clay composition significantly alters product performance, further research is needed:

[0145] Experimental Example 1.

[0146] The only difference from Example 3 is that dried cordierite was not added in the preparation of the cordierite-clay body.

[0147] Experimental Example 2.

[0148] The only difference from Example 3 is that barium carbonate was not added in the preparation of the cordierite-clay body.

[0149] Experimental Example 3.

[0150] The only difference from Example 3 is that urea solution was not added in the preparation of cordierite-clay body, and water was used instead of lanthanum chloride solution.

[0151] Experimental Example 4.

[0152] The only difference from Example 3 is that no clay was added in the preparation of the cordierite-clay body.

[0153] Experimental Example 5.

[0154] The only difference from Example 3 is that the lanthanum chloride solution has a mass fraction of 6%, and the urea solution has a mass fraction of 3%.

[0155]

[0156] As can be seen from Experiments 1-5, the performance of the cordierite-clay product changes significantly when dry cordierite is not added during preparation. Furthermore, the performance of the product deteriorates when barium carbonate and clay are not added during preparation. Additionally, the performance deteriorates to varying degrees when urea solution is not added, or when water is used instead of lanthanum chloride solution (with a lanthanum chloride mass fraction of 6% and urea solution mass fraction of 3%). The cordierite-clay product prepared using a specific raw material ratio exhibits the most significant performance improvement. Only the product prepared using the specific raw materials of this invention shows the most significant performance improvement; other methods are not as effective as those of this invention. Moreover, when the mass fraction of the raw materials used in this invention is outside the range specified in this invention, the product performance also deteriorates.

[0157] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0158] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for producing a modified self-cleaning aluminum sheet, characterized by, It comprises the following steps: The thin plate substrate is preheated at 55-60°C for 1h, then the preheated thin plate substrate is immersed in the self-made coating liquid, and is placed for 2-3h, after the immersion is completed, it is taken out and dried at room temperature for 12h to obtain the modified self-cleaning aluminum thin plate; The preparation method of the self-made coating liquid is as follows: According to the weight part, the raw materials are weighed: 40-45 parts of polyurethane resin and 10-15 parts of epoxy resin are added to 35 parts of solvent, stirred at 65°C for 1-2h, stirring speed 350-400r / min, then 8-11 parts of modified filler and 3-5 parts of functional additive and 6-8 parts of curing agent and 2-3 parts of silane coupling agent KH560 are added, continue to stir for 2h, stirring speed 200-230r / min, after stirring, the self-made coating liquid is obtained; The preparation method of the modified filler is as follows: S01: The silicon powder, calcium dodecyl sulfate and Tris-HCl buffer solution are fully blended to obtain a silicon powder solution; The calcium sulfate whisker, hydrotalcite and sodium silicate solution are fully blended according to the weight ratio (3-5):2:(4-6) to obtain a whisker modification solution; S02: The whisker modification solution and the silicon powder solution are ultrasonically treated according to the weight ratio (4-7):3 to obtain a filler modification solution; S03: The coesite-clay body and the filler modification solution are uniformly mixed and ball milled at a speed of 1000r / min for 1h, then filtered and dried to obtain the modified filler; The preparation method of the coesite-clay body is as follows: The coesite is fully stirred in a sufficient amount of 5% potassium permanganate solution, then washed with water, filtered and dried, 5-8 parts of the dried coesite, 2-4 parts of barium carbonate and 2-3 parts of clay are added to 5-8 parts of lanthanum chloride solution, then 1-2 parts of urea solution is added, stirred and treated, filtered and dried to obtain the coesite-clay body.

2. The method for preparing a modified self-cleaning aluminum sheet according to claim 1, characterized in that, The polyurethane resin is a thermoplastic polyurethane with a hydroxyl value of 10-20mgKOH / g, a glass transition temperature of 45-60°C and a molecular weight of 15000-25000; the epoxy resin is E12 epoxy resin; the curing agent is m-xylylenediamine; and the solvent is propylene glycol methyl ether acetate.

3. The method for preparing a modified self-cleaning aluminum sheet according to claim 1, characterized in that, The pH of the Tris-HCl buffer solution is 8.0-9.0; and the mass fraction of the sodium silicate solution is 2-5%.

4. The method for preparing a modified self-cleaning aluminum sheet according to claim 1, characterized in that, The ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment time is 20-30min.

5. The method for preparing a modified self-cleaning aluminum sheet according to claim 1, characterized in that, The mass fraction of the lanthanum chloride solution is 2-5%; the mass fraction of the urea solution is 4-6%; the stirring temperature of the stirring treatment is 50-55°C, the stirring speed is 550-650r / min, and the stirring time is 1h.

6. The method for preparing a modified self-cleaning aluminum sheet according to claim 1, characterized in that, The preparation method of the functional additive is as follows: S11: The nano-mica powder is preheated at 60-70°C for 2h, then the preheated nano-mica powder is added to a 5% sodium dodecylbenzenesulfonate solution with a mass fraction of 5% and stirred uniformly to obtain a nano-mica solution; S12: 2-3 parts of silver nanowire, 1-3 parts of sodium carboxymethyl cellulose and 5-8 parts of yttrium nitrate solution and 2-4 parts of nano calcium carbonate are blended and fully mixed to obtain a silver nanowire agent; S13: 4-6 parts of nano mica liquid and 5-8 parts of the silver nanowire agent are ball milled, the ball milling speed is 1000-1500 r / min, the ball milling time is 2 h, after the ball milling, filtration and drying are performed to obtain a functional additive.

7. The method of claim 6, wherein the modified self-cleaning aluminum sheet is prepared by the steps of: (a) preparing an aluminum sheet; (b) forming a first layer on the aluminum sheet; (c) forming a second layer on the first layer; and (d) forming a third layer on the second layer. The mass fraction of the yttrium nitrate solution is 2-5%.

8. The modified self-cleaning aluminum sheet prepared by the preparation method of the modified self-cleaning aluminum sheet according to any one of claims 1-7.

Images