Environment-friendly aluminum alloy material for building and preparation method of environment-friendly aluminum alloy material

Abstract

The invention belongs to the technical field of aluminum alloy materials, and provides an environment-friendly aluminum alloy material for buildings and a preparation method of the environment-friendly aluminum alloy material for the buildings, and the environment-friendly aluminum alloy material for the buildings comprises the following components in percentage by mass: 0.5 to 0.8 percent of Mg, 0.35 to 0.8 percent of Si, 0.1 to 0.2 percent of Cu, 0.08 to 0.1 percent of Mn, 0.10 to 0.14 percent of Cr, 0.06 to 0.10 percent of Zr, 0.05 to 0.15 percent of Fe, 0.10 to 0.20 percent of Zn, 0.01 to 0.02 percent of Ni, 0.10 to 0.30 percent of rare earth elements and the balance of Al. By reasonably controlling the composition and content of aluminum alloy elements, the aluminum alloy has the advantages of being high in mechanical strength, good in ductility, excellent in casting formability and the like.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy material technology, specifically relating to an environmentally friendly aluminum alloy material for construction and its preparation method. Background Technology

[0002] In the construction industry, formwork is a crucial tool for concrete molding, and its performance directly impacts construction quality and efficiency. Traditional wooden and steel formwork have numerous drawbacks: wooden formwork consumes a large amount of resources, has a low reuse rate, exacerbates the problem of forest resource shortages, and is susceptible to moisture and deformation, affecting the accuracy of concrete molding; steel formwork, on the other hand, is heavy, difficult to transport and install, prone to rust and corrosion, and has high maintenance costs. With the rapid development of the construction industry and the deepening promotion of "dual carbon" goals and green building concepts, the market demand for environmentally friendly, efficient, and durable new formwork materials is becoming increasingly urgent.

[0003] Aluminum profiles, with their lightweight, high strength, corrosion resistance, and recyclability, are gradually becoming an ideal alternative material for construction formwork. However, current aluminum profiles for construction formwork on the market still have shortcomings in terms of environmental performance, mechanical properties, and adaptability, making it difficult to fully meet the diverse needs of modern construction. There is an urgent need to develop environmentally friendly aluminum profiles with superior performance. The current aluminum profiles for construction formwork generally suffer from the following problems: First, the production process of some aluminum profiles is energy-intensive, and the surface treatment process uses chemical reagents containing heavy metals and other harmful substances, causing environmental pollution. Second, the mechanical properties of aluminum profiles need improvement; they are prone to deformation when subjected to large lateral pressures from concrete, affecting the stability of the formwork and the quality of concrete forming. Third, the structural design of aluminum profiles lacks versatility and flexibility, making it difficult to adapt to the needs of different building structures and construction processes, resulting in low efficiency in formwork assembly and disassembly.

[0004] Therefore, it is urgent to develop an environmentally friendly aluminum profile for building formwork that takes into account environmental performance, mechanical performance, and construction applicability. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an environmentally friendly aluminum alloy material for construction and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides an environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises the following components by weight percentage: Mg 0.5-0.8%, Si 0.35-0.8%, Cu 0.1-0.2%, Mn 0.08-0.1%, Cr 0.10-0.14%, Zr 0.06-0.10%, Fe 0.05-0.15%, Zn 0.10-0.20%, Ni 0.01-0.02%, rare earth elements 0.10-0.30%, balance Al.

[0007] As a further aspect of the present invention, the rare earth element is at least one selected from La (lanthanum) and Ce (cerium). The addition of rare earth elements can significantly improve the purity of the aluminum alloy melt, grain refinement, and mechanical properties. Furthermore, rare earth elements themselves are environmentally friendly and their addition process is easily controlled.

[0008] A second aspect of this invention provides a method for preparing an environmentally friendly aluminum alloy material for construction, comprising the following steps: Step 1: The aluminum alloy raw material is put into the melting furnace for melting to obtain aluminum alloy melt. Then, it is refined, cast, homogenized, extruded, solution treated and artificially aged to obtain aluminum alloy profiles. Step 2: First, soak the aluminum alloy profile in a sodium hydroxide solution (concentration of 5%) for 5-10 minutes, rinse repeatedly with deionized water, then soak the aluminum alloy profile in a dilute hydrochloric acid solution (concentration of 5%) for 5-10 minutes, rinse repeatedly with deionized water, blow dry with nitrogen, then soak the aluminum alloy profile in a surface treatment agent for surface treatment, and air dry naturally to obtain the aluminum alloy material.

[0009] As a further aspect of the present invention, in step 1, the melting temperature in the melting furnace is 580–690°C, and the melting time is 10–20 min.

[0010] As a further aspect of the present invention, the specific steps of the solution treatment in step 1 are as follows: the aluminum alloy rod is kept at 520-540°C for 0.5-1 hour, and then rapidly cooled with water at room temperature.

[0011] As a further aspect of the present invention, the specific steps of the artificial aging treatment in step 1 are as follows: the aluminum alloy bar after solution treatment is kept at a temperature of 160-175°C for 6-8 hours.

[0012] As a further embodiment of the present invention, the surface treatment agent in step 2 comprises the following raw materials in parts by weight: The modified silica sol comprises 4-10 parts of modified silica sol, 3-8 parts of silane coupling agent, 60-90 parts of anhydrous ethanol, and 30-46 parts of deionized water; the modified silica sol is prepared by the following steps: S1. Add 0.40–0.42 g ammonium persulfate, 0.82–0.84 g sodium dodecyl sulfate, and 0.40–0.42 g fatty alcohol polyoxyethylene ether to 100 mL of deionized water, heat to 50–55 °C and stir for 0.5–1 h. Then add 8.2–8.5 g acrylate monomer and continue stirring for 3–3.5 h. After the reaction is complete, an emulsion is obtained. Take 1 / 3 of the emulsion and add 0.26–0.28 g ammonium persulfate. Heat to 70–75 °C and continue stirring until the solution turns light blue. Then add the remaining 2 / 3 of the emulsion and 5.3–5.6 g fluorinated acrylate monomer at a uniform rate. Keep the reaction at this temperature for 0.5–1 h, keeping the color of the emulsion unchanged during the reaction. Heat to 80–85 °C and continue stirring for 1.5–2 h. Adjust the pH to 7 and filter to obtain the fluorinated acrylate emulsion. S2. Mix 0.3-0.5g of nano silica sol with 10-12mL of fluorinated acrylate emulsion, stir evenly, and filter to obtain modified silica sol.

[0013] As a further embodiment of the present invention, the acrylate monomer is at least one selected from methyl methacrylate, methacrylic acid, and butyl acrylate.

[0014] As a further embodiment of the present invention, the fluorinated acrylate monomer is dodecafluoroheptyl methacrylate.

[0015] As a further embodiment of the present invention, the silane coupling agent is one of silane coupling agent KH-550, silane coupling agent KH-560 or silane coupling agent KH-570.

[0016] The beneficial effects of this invention are: This invention provides an environmentally friendly aluminum alloy material for construction. By rationally controlling the composition and content of aluminum alloy elements, it has advantages such as high mechanical strength, good ductility, and excellent casting formability.

[0017] This invention provides a surface treatment agent obtained by uniformly mixing modified silica sol, silane coupling agent, and anhydrous ethanol with deionized water. Using this surface treatment agent to treat the surface of aluminum alloy materials can form a uniform protective film layer. The resulting protective film layer exhibits good chemical stability, wear resistance, and corrosion resistance, is not easily damaged by the external environment, and meets green environmental protection requirements. The modified silica sol used in the raw materials is modified by a fluorinated acrylate emulsion to modify the nano-silica sol. An interwoven structure of organic and inorganic elements is formed between the nano-silica particles and polymer segments, which to a certain extent hinders the movement of polymer segments. Therefore, the polymer is less prone to decomposition when heated, effectively improving the thermal stability of the silica sol and thus enhancing the heat resistance of the film layer. Simultaneously, the high degree of cross-linking between the nanoparticles and the emulsion allows for mutual diffusion, penetration, and entanglement between the latex particles, forming a dense and uniform film layer with good density. This enhances the resistance to external forces, increases impact strength, and reduces contact between corrosive media and the aluminum alloy material, thereby improving the corrosion resistance of the aluminum alloy material. In addition, the combination of fluorinated acrylate emulsion with low surface energy and silica with micro-nano structure can effectively increase the surface roughness of the film, thereby improving the hydrophobicity of the protective film and extending the service life of the film.

[0018] This invention provides a method for preparing an environmentally friendly aluminum alloy material for construction. This method is simple to operate, easy to implement industrially, and the resulting aluminum alloy material has advantages such as high mechanical strength, good ductility, excellent casting formability, and environmental friendliness. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0020] Preparation Example

[0021] Preparation Example 1

[0022] This preparation example provides a surface treatment agent comprising the following parts by weight of raw materials: The modified silica sol was prepared by the following steps: 4 parts modified silica sol, 3 parts silane coupling agent KH-570, 60 parts anhydrous ethanol, and 30 parts deionized water. S1. Add 0.40g ammonium persulfate, 0.82g sodium dodecyl sulfate and 0.402g fatty alcohol polyoxyethylene ether to 100mL of deionized water, heat to 50℃ and stir for 0.5h, then add 8.2g methyl methacrylate and continue stirring for 3h. After the reaction is complete, an emulsion is obtained. Take 1 / 3 of the emulsion and add 0.26g ammonium persulfate. Heat to 70℃ and continue stirring until the solution turns light blue. Then add the remaining 2 / 3 of the emulsion and 5.3g dodecyl fluoroheptyl methacrylate at a uniform rate. Keep the reaction at this temperature for 0.5h, keeping the color of the emulsion unchanged during the reaction. Heat to 80℃ and continue stirring for 1.5h. Adjust the pH to 7 and filter to obtain a fluorinated acrylate emulsion. S2. Mix 0.3g of nano silica sol and 10mL of fluorinated acrylate emulsion, stir evenly, and filter to obtain modified silica sol.

[0023] Preparation Example 2

[0024] The only difference from Preparation Example 1 is that: The modified silica sol is prepared through the following steps: S1. Add 0.42g ammonium persulfate, 0.84g sodium dodecyl sulfate and 0.42g fatty alcohol polyoxyethylene ether to 100mL of deionized water, heat to 55℃ and stir for 1h, then add 8.5g methyl methacrylate and continue stirring for 3h. After the reaction is complete, an emulsion is obtained. Keep 1 / 3 of the emulsion, add 0.28g ammonium persulfate, heat to 70℃ and continue stirring until the solution turns light blue. Then add the remaining 2 / 3 of the emulsion and 5.6g dodecyl fluoroheptyl methacrylate at a uniform rate, keep the reaction temperature constant for 0.5h, keep the emulsion color unchanged during the reaction, heat to 80℃ and continue stirring for 1.5h, adjust the pH to 7, and filter to obtain a fluorinated acrylate emulsion. S2. Mix 0.5g of nano silica sol and 12mL of fluorinated acrylate emulsion, stir evenly, and filter to obtain modified silica sol.

[0025] Preparation Example 3

[0026] The only difference from Preparation Example 1 is that: A surface treatment agent comprising the following raw materials in parts by weight: 7.5 parts modified silica sol, 5.6 parts silane coupling agent KH-570, 75 parts anhydrous ethanol, and 38 parts deionized water.

[0027] Preparation Example 4

[0028] The only difference from Preparation Example 1 is that: A surface treatment agent comprising the following raw materials in parts by weight: 10 parts modified silica sol, 8 parts silane coupling agent KH-570, 88 parts anhydrous ethanol, and 46 parts deionized water.

[0029] Preparation Example 5

[0030] This preparation example provides a surface treatment agent comprising the following parts by weight of raw materials: 4 parts silica sol, 3 parts silane coupling agent KH-570, 60 parts anhydrous ethanol, and 30 parts deionized water.

[0031] Example

[0032] Example 1

[0033] This embodiment provides an environmentally friendly aluminum alloy material for construction and its preparation method: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises the following components by mass percentage: Mg 0.5%, Si 0.35%, Cu 0.1%, Mn 0.08%, Cr 0.10%, Zr 0.06%, Fe 0.05%, Zn 0.1%, Ni 0.01%, La 0.1%, with the balance being Al.

[0034] A method for preparing an environmentally friendly aluminum alloy material for construction includes the following steps: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 160℃ for 6 hours to obtain aluminum alloy profile. Step 2: First, soak the aluminum alloy profile in a sodium hydroxide solution (concentration of 5%) for 10 minutes, rinse repeatedly with deionized water, then soak the aluminum alloy profile in a dilute hydrochloric acid solution (concentration of 5%) for 8 minutes, rinse repeatedly with deionized water, blow dry with nitrogen, and then soak the aluminum alloy profile in the surface treatment agent in Preparation Example 1 for surface treatment. After air drying, the aluminum alloy material is obtained.

[0035] Example 2

[0036] The only difference from Example 1 is that: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises, by mass percentage: Mg 0.6%, Si 0.5%, Cu 0.15%, Mn 0.09%, Cr 0.12%, Zr 0.08%, Fe 0.10%, Zn 0.15%, Ni 0.015%, La 0.2%, with the balance being Al.

[0037] Example 3

[0038] The only difference from Example 1 is that: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises, by mass percentage: Mg 0.8%, Si 0.8%, Cu 0.2%, Mn 0.1%, Cr 0.14%, Zr 0.10%, Fe 0.15%, ZnO 0.2%, Ni 0.02%, Ce 0.3%, with the balance being Al.

[0039] Example 4

[0040] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 680℃ for 15 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 160℃ for 6 hours to obtain the aluminum alloy profile.

[0041] Example 5

[0042] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 535℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 160℃ for 6 hours to obtain the aluminum alloy profile.

[0043] Example 6

[0044] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 170℃ for 7 hours to obtain the aluminum alloy profile.

[0045] Example 7

[0046] The only difference from Example 1 is that: Replace the surface treatment agent in Preparation Example 1 in step 2 with the surface treatment agent in Preparation Example 2.

[0047] Example 8

[0048] The only difference from Example 1 is that: Replace the surface treatment agent in Preparation Example 1 in step 2 with the surface treatment agent in Preparation Example 3.

[0049] Example 9

[0050] The only difference from Example 1 is that: Replace the surface treatment agent in Preparation Example 1 in step 2 with the surface treatment agent in Preparation Example 4.

[0051] Comparative Example

[0052] Comparative Example 1

[0053] This comparative example provides an environmentally friendly aluminum alloy material for construction and its preparation method: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises the following components by mass percentage: Mg 0.5%, Si 0.35%, Cu 0.1%, Mn 0.08%, Cr 0.10%, Zr 0.06%, Fe 0.05%, Zn 0.1%, Ni 0.01%, with the balance being Al.

[0054] A method for preparing an environmentally friendly aluminum alloy material for construction includes the following steps: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 160℃ for 6 hours to obtain the aluminum alloy material.

[0055] Comparative Example 2

[0056] This comparative example provides an environmentally friendly aluminum alloy material for construction and its preparation method: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises the following components by mass percentage: Mg 0.5%, Si 0.35%, Cu 0.1%, Mn 0.08%, Cr 0.10%, Zr 0.06%, Fe 0.05%, Zn 0.1%, Ni 0.01%, with the balance being Al.

[0057] Comparative Example 3

[0058] The only difference from Example 1 is that: An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material comprises the following components by mass percentage: Mg 0.5%, Si 0.35%, Mn 0.08%, Zr 0.06%, Fe 0.05%, Zn 0.1%, Ni 0.01%, La 0.1%, with the balance being Al.

[0059] Comparative Example 4

[0060] The only difference from Example 1 is that: Replace the surface treatment agent in Preparation Example 1 in step 2 with the surface treatment agent in Preparation Example 5.

[0061] Comparative Example 5

[0062] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 540℃ for 8 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 160℃ for 6 hours to obtain the aluminum alloy profile.

[0063] Comparative Example 6

[0064] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 480℃ for 0.3 hours, followed by rapid cooling in water at room temperature. Finally, it is subjected to artificial aging treatment: the solution-treated aluminum alloy bar is held at 160℃ for 6 hours to obtain the aluminum alloy profile.

[0065] Comparative Example 7

[0066] The only difference from Example 1 is that: Step 1: The aluminum alloy raw material is put into the melting furnace for melting at a temperature of 580℃ for 10 minutes to obtain the aluminum alloy melt. Then, it is refined, cast, homogenized, extruded and formed, and then subjected to solution treatment: the aluminum alloy bar is held at 520℃ for 0.5 hours, then rapidly cooled with water at room temperature, and finally subjected to artificial aging treatment: the solution treated aluminum alloy bar is held at 140℃ for 5 hours to obtain the aluminum alloy profile.

[0067] Performance testing

[0068] The following performance tests were performed on Examples 1-9 and Comparative Examples 1-7: (1) Mechanical properties: The tensile strength and yield strength were tested in accordance with GB / T 228.1-2010 Metallic materials, tensile test, part 1: room temperature test method.

[0069] (2) Corrosion performance: The test shall be conducted in accordance with GB / T6892-2006. The appearance of tiny blisters, cracks, flakes or powder on the surface with only slight separation (EA) is acceptable; the appearance of obvious delamination on the surface with penetration into the metal (EB-ED) is unacceptable.

[0070] (3) Sealing performance: The sealing performance of the film formed after the treatment agent is applied to the aluminum alloy surface is tested by salt spray test.

[0071] The test results are shown in Table 1: Table 1

[0072] As shown in Table 1, compared with Comparative Examples 1-7, the aluminum alloy materials prepared in Examples 1-9 have superior mechanical strength, corrosion resistance, and sealing performance. Combining Comparative Examples 1-7 and Examples 1-9, it can be seen that the environmentally friendly aluminum alloy material for construction provided by this invention, through adjustments to the components and proportions to ensure their synergistic effect, and improvements to the preparation process, enables the aluminum alloy material to simultaneously possess excellent mechanical properties, thermal stability, and corrosion resistance.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly aluminum alloy material for construction, wherein the aluminum alloy material is characterized in that, By mass percentage, it includes the following components: Mg 0.5-0.8%, Si 0.35-0.8%, Cu 0.1-0.2%, Mn 0.08-0.1%, Cr 0.10-0.14%, Zr 0.06-0.10%, Fe 0.05-0.15%, Zn 0.10-0.20%, Ni 0.01-0.02%, rare earth elements 0.10-0.30%, balance Al.

2. The environmentally friendly aluminum alloy material for construction according to claim 1, characterized in that, The rare earth element is at least one of La and Ce.

3. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 1, characterized in that, Includes the following steps: Step 1: The aluminum alloy raw material is put into the melting furnace for melting to obtain aluminum alloy melt. Then, it is refined, cast, homogenized, extruded, solution treated and artificially aged to obtain aluminum alloy profiles. Step 2: First, soak the aluminum alloy profile in sodium hydroxide solution for 5-10 minutes, rinse repeatedly with deionized water, then soak the aluminum alloy profile in dilute hydrochloric acid solution for 5-10 minutes, rinse repeatedly with deionized water, blow dry with nitrogen, then soak the aluminum alloy profile in a surface treatment agent for surface treatment, and air dry naturally to obtain the aluminum alloy material.

4. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 3, characterized in that, In step 1, the melting temperature in the melting furnace is 580–690℃, and the melting time is 10–20 min.

5. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 3, characterized in that, The specific steps of the solution treatment in step 1 are as follows: the aluminum alloy bar is kept at 520-540℃ for 0.5-1h, and then rapidly cooled with water at room temperature.

6. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 3, characterized in that, The specific steps of the artificial aging treatment in step 1 are as follows: the aluminum alloy bar after solution treatment is kept at a temperature of 160-175℃ for 6-8 hours.

7. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 3, characterized in that, The surface treatment agent in step 2 comprises the following raw materials in parts by weight: The modified silica sol comprises 4-10 parts of modified silica sol, 3-8 parts of silane coupling agent, 60-90 parts of anhydrous ethanol, and 30-46 parts of deionized water; the modified silica sol is prepared by the following steps: S1. Add 0.40–0.42 g ammonium persulfate, 0.82–0.84 g sodium dodecyl sulfate, and 0.40–0.42 g fatty alcohol polyoxyethylene ether to 100 mL of deionized water, heat to 50–55 °C and stir for 0.5–1 h. Then add 8.2–8.5 g acrylate monomer and continue stirring for 3–3.5 h. After the reaction is complete, an emulsion is obtained. Take 1 / 3 of the emulsion and add 0.26–0.28 g ammonium persulfate. Heat to 70–75 °C and continue stirring until the solution turns light blue. Then add the remaining 2 / 3 of the emulsion and 5.3–5.6 g fluorinated acrylate monomer at a uniform rate. Keep the reaction at this temperature for 0.5–1 h, keeping the color of the emulsion unchanged during the reaction. Heat to 80–85 °C and continue stirring for 1.5–2 h. Adjust the pH to 7 and filter to obtain the fluorinated acrylate emulsion. S2. Mix 0.3-0.5g of nano silica sol with 10-12mL of fluorinated acrylate emulsion, stir evenly, and filter to obtain modified silica sol.

8. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 7, characterized in that, The acrylate monomer is at least one of methyl methacrylate, methacrylic acid, and butyl acrylate.

9. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 7, characterized in that, The fluorinated acrylate monomer is dodecafluoroheptyl methacrylate.

10. The method for preparing an environmentally friendly aluminum alloy material for construction according to claim 7, characterized in that, The silane coupling agent is one of silane coupling agent KH-550, silane coupling agent KH-560, or silane coupling agent KH-570.

Images