A durable aluminum rod and its preparation method

Abstract

The present application relates to the technical field of aluminum alloys, and specifically discloses a durable aluminum rod and a preparation method thereof. The durable aluminum rod comprises an aluminum rod and a durable coating applied to the aluminum rod, wherein the durable coating comprises a durable coating, and the durable coating comprises the following materials in parts by weight: 40-60 parts of acrylic resin; 4-8 parts of film-forming aid; 10-25 parts of filler; 8-15 parts of pigment; 0.5-1.5 parts of dispersant; 0.1-0.5 parts of defoamer; 0.1-0.5 parts of thickener; 0.5-1 parts of accelerator; 0.11-0.5 parts of mildewcide; 5-10 parts of water; the acrylic resin comprises an acrylic resin modified with a phosphate ester. The preparation method thereof is as follows: S1, preparation of durable coating; S2, surface treatment of aluminum rod; S3, preparation of aluminum rod. The durable aluminum rod of the present application can be used in building structures, and has the advantages of corrosion resistance, wear resistance, and long service life.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum alloys, and more particularly, to a durable aluminum rod and a preparation method thereof. Background Art

[0002] Aluminum alloys are the most widely used nonferrous structural materials in industry, with extensive applications in aviation, aerospace, automotive, machinery manufacturing, shipbuilding, and the chemical industry. The rapid development of the industrial economy has led to an increasing demand for welded aluminum alloy components, prompting in-depth research on the weldability of aluminum alloys. Currently, aluminum alloys are the most widely used alloys.

[0003] Aluminum materials formed by aluminum alloys are mostly used in building structures, indoor and outdoor decoration, large equipment, etc., which usually require aluminum materials to have better durability. However, single aluminum materials are more susceptible to oxidation, which reduces the strength and durability of aluminum materials. Summary of the Invention

[0004] In order to improve the durability of aluminum materials, the present application provides a durable aluminum rod and a preparation method thereof, which adopts the following technical solutions:

[0005] In a first aspect, the present application provides a durable aluminum rod, comprising an aluminum rod and a durable coating applied to the aluminum rod, wherein the durable coating comprises a durable coating, and the durable coating comprises the following materials in parts by weight:

[0006] 40-60 parts of acrylic resin;

[0007] 4-8 parts of film-forming aid;

[0008] 10-25 parts of filler;

[0009] 8-15 parts of pigment;

[0010] Dispersant 0.5-1.5 parts;

[0011] 0.1-0.5 parts of defoaming agent;

[0012] Thickener 0.1-0.5 parts;

[0013] Accelerator 0.5-1 part;

[0014] 0.1-0.5 parts of mildew inhibitor;

[0015] 5-10 parts water;

[0016] The acrylic resin includes a phosphate-modified acrylic resin.

[0017] By adopting the above-mentioned technical solution, the present application uses phosphate ester to modify the acrylic resin. This increases the number of active groups on the acrylic resin, which can promote a reaction between the durable coating and the aluminum rod and form a covalent bond, thereby effectively improving the adhesion of the durable coating to the aluminum rod, enabling the durable coating to provide long-term protection for the aluminum rod. At the same time, due to the excellent antistatic and rust-resistant properties of the phosphate ester itself, it can effectively improve the antistatic effect, rust-proof ability, and corrosion resistance of the durable coating, maintaining the cleanliness and integrity of the durable coating surface.

[0018] Optionally, the preparation of the phosphate-modified acrylic resin includes:

[0019] S1. Preparation of functional phosphate ester: Phosphorus pentoxide and hydroxypropyl methacrylate are mixed, heated for esterification, water is added for hydrolysis, and the temperature is raised again for reaction to obtain a functional monomer;

[0020] S2. Phosphate-modified acrylic acid: functional monomer, acrylic acid and initiator are mixed to obtain a mixed monomer, and the mixed monomer is dropwise added to ethylene glycol butyl ether, and the mixture is heated to react to obtain phosphate-modified acrylic acid;

[0021] The added amount of the functional monomer is 3%-5% of the total mass of the functional monomer, acrylic acid and initiator.

[0022] By adopting the above technical solution, ethylene glycol butyl ether is used as a solvent, and functional monomers are freely polymerized with acrylic acid to produce a phosphate-modified acrylic resin. The addition amount of the functional monomer is optimized. At the appropriate addition amount, the phosphate ester reacts fully with the acrylic acid without acid residue, resulting in an appropriate amount of phosphate groups in the modified acrylic acid. This promotes the formation of a dense protective film on the surface of the aluminum rod, thereby extending the service life of the aluminum rod.

[0023] Optionally, the filler includes glass flakes.

[0024] By adopting the above technical solution and selecting glass flakes as fillers, the glass flakes can form a layered and stacked structure in the coating, and can form a maze in the coating, thereby extending the penetration distance of corrosive media such as steam, acid, and alkali in the coating, thereby effectively improving the corrosion resistance of the durable coating. At the same time, the parallel stacking arrangement of the glass flakes can reduce the curing shrinkage rate of the coating, reduce residual stress, and improve the heat resistance and impact resistance of the coating. In addition, because the glass flakes can be arranged layer by layer in the coating, they can effectively improve the wear resistance of the coating, that is, reduce the possibility of coating damage, maintain the integrity of the coating, and extend the service life of the coating.

[0025] Optionally, the glass flakes are glass flakes modified with a silane coupling agent, and the mass ratio of the glass flakes to the silane coupling agent is 1:3-5.

[0026] By adopting the above technical solution, the glass flakes are modified with a silane coupling agent. The silane coupling agent is grafted onto the surface of the glass flakes, introducing long-chain groups there. This creates a rough surface structure, reduces the tendency of the glass flakes to agglomerate, effectively improves the uniformity of the glass flakes' dispersion in the coating, and reduces stress concentration and the occurrence of unoriented alignment in the coating. The ratio of silane coupling agent to glass flakes is optimized, ensuring that the silane coupling agent fully coats the glass flakes, optimizing their surface morphology and reducing the likelihood of agglomeration. Furthermore, the bonding between the glass flakes and the other components of the coating is improved.

[0027] Optionally, the filler further includes any one of micron alumina, silicon carbide powder and calcium carbonate.

[0028] By adopting the above technical solution, micronized alumina, silicon carbide powder, or calcium carbonate are selected and combined with glass flakes as fillers. These micronized alumina, silicon carbide powder, and calcium carbonate can fill the pores between the glass flakes, increasing the density of the coating and further enhancing its corrosion resistance. Furthermore, the addition of micronized alumina, silicon carbide powder, or calcium carbonate improves the strength of the coating and reduces the likelihood of damage from collisions. Furthermore, the reaction between calcium carbonate and phosphate esters can reduce calcium carbonate agglomeration, improve the uniformity of its dispersion in the durable coating, and achieve a uniform coating density.

[0029] Optionally, the calcium carbonate is calcium carbonate modified by aluminum silicate and aluminum sulfate.

[0030] By adopting the above technical solution, aluminum silicate and aluminum sulfate are used to modify calcium carbonate in a coordinated manner, so that a composite coating layer of silicon dioxide and calcium sulfate can be coated on the surface of calcium carbonate, thereby improving the acid and alkali resistance of calcium carbonate and making the coating surface obtain a uniform corrosion resistance effect.

[0031] Optionally, the calcium carbonate is nano calcium carbonate.

[0032] By adopting this technical solution, the particle size of calcium carbonate is optimized, allowing nano-calcium carbonate to fully fill the pore structure of the coating, reducing the number of tiny pores in the coating, thereby improving the coating's density. At the same time, the nano-calcium carbonate acts as a ball within the filler, lubricating the glass flakes and reducing their aggregation. This allows the glass flakes to form a layered, orderly stacked structure within the coating, creating a stable shielding layer.

[0033] Optionally, the filler further includes basalt fiber or mullite whisker.

[0034] By adopting the above technical solution, which combines basalt fibers or mullite whiskers with glass flakes, the fiber structure can fill the pore structure created by the glass flakes and introduce a network structure into the coating, thereby improving the coating's density. Furthermore, the addition of the fiber structure can form bridges between the glass flakes, enhancing the coating's density and the bonding between the glass flakes and the coating substrate, while also effectively improving the coating's impact resistance.

[0035] Optionally, the basalt fiber is loaded with zinc phosphate sheets, and the preparation method is: mixing the basalt fiber with zinc nitrate solution, adding urea solution and sodium dihydrogen phosphate solution to the zinc nitrate solution in sequence, microwave reaction, filtering, washing, drying, and crushing to obtain modified basalt fiber.

[0036] By adopting the above technical solution, zinc phosphate sheets are loaded onto basalt fibers. Zinc phosphate has excellent UV resistance, thus imparting excellent UV resistance to the coating, improving the coating's anti-aging properties and extending the coating's protective effect on the aluminum rod. Furthermore, the zinc phosphate's lamellar structure complements the glass flakes in the coating, creating a labyrinthine structure within the coating, further increasing the coating's density and forming a UV-resistant network under the load of the basalt fibers, resulting in a uniform UV protection effect.

[0037] In a second aspect, the present application provides a method for preparing a durable aluminum rod, which adopts the following technical solution:

[0038] A method for preparing a durable aluminum rod comprises the following steps:

[0039] S1. Preparation of durable coating: taking acrylic resin, film-forming aid, filler, pigment, dispersant, defoamer, thickener, accelerator, mildewcide and water according to the above parts by weight, stirring and dispersing in a disperser to obtain a durable coating;

[0040] S2. Surface treatment of aluminum rod: taking an untreated aluminum rod and performing sandblasting on it to obtain a pretreated aluminum rod;

[0041] S3. Aluminum rod preparation: Apply a durable coating on the surface of the pretreated aluminum rod and dry it to obtain an aluminum rod.

[0042] By adopting the above technical solution, the surface of the aluminum rod is sandblasted, which effectively increases the roughness of the surface of the aluminum rod, improves the bonding between the durable coating and the aluminum rod, and enables the durable coating to protect the aluminum rod for a long time.

[0043] In summary, this application has the following beneficial effects:

[0044] 1. Because the present invention utilizes phosphate esters to modify acrylic resin, the increased number of active groups on the acrylic resin promotes a reaction between the durable coating and the aluminum rod, forming a covalent bond. This effectively enhances the durable coating's adhesion to the aluminum rod, enabling the durable coating to provide long-term protection. Furthermore, due to the phosphate ester's inherently excellent antistatic and rust-resistant properties, it effectively enhances the durable coating's antistatic, rust-resistant, and corrosion-resistant properties, maintaining the cleanliness and integrity of the durable coating surface.

[0045] 2. Glass flakes are selected as fillers in this application. Glass flakes can form a layered and stacked structure in the coating, and can form a maze in the coating, thereby increasing the penetration distance of the corrosive medium in the coating, thereby effectively improving the corrosion resistance of the durable coating. At the same time, the parallel overlapping arrangement of glass flakes can reduce the curing shrinkage of the coating, reduce residual stress, and improve the heat resistance and impact resistance of the coating. In addition, since glass flakes can be arranged layer by layer in the coating, they can effectively improve the wear resistance of the coating, that is, reduce the possibility of coating damage, maintain the integrity of the coating, and extend the service life of the coating.

[0046] 3. This application uses micronized alumina, silicon carbide powder, or calcium carbonate in combination with glass flakes as fillers. These materials can fill the pores between the glass flakes, increasing the coating's density and further enhancing its corrosion resistance. Furthermore, the addition of micronized alumina, silicon carbide powder, or calcium carbonate improves the coating's strength and reduces the likelihood of damage from impact. DETAILED DESCRIPTION

[0047] The present application is further described in detail below with reference to the embodiments.

[0048] In the examples of this application, the drugs used are as follows, but not limited to these:

[0049] Drugs: The defoaming agent is SQ-XP101 defoaming agent (polysiloxane); the thickener is RHOPLEX TT-935 thickener; the dispersant is BASF Dispex Ultra PX 4575 dispersant; and the antifungal agent is LANXESS Preventol BIT 20D antifungal agent.

[0050] Preparation Example

[0051] Preparation example of phosphate modified acrylic resin

[0052] Preparation Example 1

[0053] S1. Preparation of functional phosphate: Phosphorus pentoxide and hydroxypropyl methacrylate were mixed in a molar ratio of 2:1, heated to 35°C for esterification for 3.5 hours, and then 4% by weight of water was added for hydrolysis. The mixture was heated to 90°C again for reaction for 2 hours, and cooled to obtain a functional monomer.

[0054] S2. Phosphate-modified acrylic acid: functional monomer, acrylic acid and initiator AIBN were mixed in a mass ratio of 0.3:10:0.2 to obtain a mixed monomer. Ethylene glycol butyl ether was heated to 100°C and the mixed monomer was added dropwise to the ethylene glycol butyl ether within 1.5 hours. The mixture was heated to 110°C and kept warm for 1 hour. The mixture was cooled and the pH was adjusted to 7-8 with ethanolamine to obtain phosphate-modified acrylic acid 1.

[0055] Preparation Example 2

[0056] S1. Preparation of functional phosphate: Phosphorus pentoxide and hydroxypropyl methacrylate were mixed in a molar ratio of 2:1, heated to 35°C for esterification for 3.5 hours, and then 4% by weight of water was added for hydrolysis. The mixture was heated to 90°C again for reaction for 2 hours, and cooled to obtain a functional monomer.

[0057] S2. Phosphate-modified acrylic acid: functional monomer, acrylic acid and initiator AIBN were mixed in a mass ratio of 0.4:10:0.2 to obtain a mixed monomer. Ethylene glycol butyl ether was heated to 100°C and the mixed monomer was added dropwise to the ethylene glycol butyl ether within 1.5 hours. The temperature was raised to 110°C and the reaction was kept at this temperature for 1 hour. The mixture was cooled and the pH was adjusted to 7-8 with ethanolamine to obtain phosphate-modified acrylic acid 2.

[0058] Preparation Example 3

[0059] S1. Preparation of functional phosphate: Phosphorus pentoxide and hydroxypropyl methacrylate were mixed in a molar ratio of 2:1, heated to 35°C for esterification for 3.5 hours, and then 4% by weight of water was added for hydrolysis. The mixture was heated to 90°C again for reaction for 2 hours, and cooled to obtain a functional monomer.

[0060] S2. Phosphate-modified acrylic acid: functional monomer, acrylic acid and initiator AIBN were mixed in a mass ratio of 0.5:10:0.2 to obtain a mixed monomer. Ethylene glycol butyl ether was heated to 100°C and the mixed monomer was added dropwise to the ethylene glycol butyl ether within 1.5 hours. The mixture was heated to 110°C and kept in the reaction for 1 hour. The mixture was cooled and the pH was adjusted to 7-8 with ethanolamine to obtain phosphate-modified acrylic acid 3.

[0061] Preparation example of modified glass flakes

[0062] Preparation Example 4

[0063] The glass flakes were placed in a drying oven and dried at 105°C for 24 hours. 50g of the dried glass flakes were weighed and added to 500mL of an ethanol / water solution, with the volume ratio of ethanol to deionized water being 4:1. The mixture was stirred at 500 rpm for 15 minutes. A 0.1mol / L KH560 ethanol solution was then added dropwise to the dispersion, with a mass ratio of silane coupling agent KH560 to glass flakes of 3:1. The mixture was heated to 85°C and allowed to react for 4 hours. After the reaction, the reaction product was vacuum filtered, rinsed repeatedly with deionized water and ethanol, and dried under vacuum at 40°C to obtain modified glass flake 1.

[0064] Preparation Example 5

[0065] The glass flakes were placed in a drying oven and dried at 105°C for 24 hours. 50g of the dried glass flakes were weighed and added to 500mL of an ethanol / water solution, with the volume ratio of ethanol to deionized water being 4:1. The mixture was stirred at 500 rpm for 15 minutes. A 0.1mol / L KH560 ethanol solution was then added dropwise to the dispersion, with a mass ratio of silane coupling agent KH560 to glass flakes of 5:1. The mixture was heated to 85°C and allowed to react for 4 hours. After the reaction, the reaction product was vacuum filtered, rinsed repeatedly with deionized water and ethanol, and dried under vacuum at 40°C to obtain modified glass flake 2.

[0066] Preparation example of modified calcium carbonate

[0067] Preparation Example 6

[0068] ① Mix limestone and anthracite in a ratio of 10:1 in a vertical kiln and calcine at a temperature of 1000±100℃ to obtain quicklime and kiln gas; ② The kiln gas is purified to obtain clean kiln gas; ③ The quicklime and hot water are digested in a cyclone digester to obtain lime milk, which is sieved and aged to obtain refined lime milk, and the temperature of the lime milk is adjusted to 18-30℃ and the concentration is 6%-10%; ④ The refined lime milk is pumped into a carbonization reactor, clean kiln gas (containing 30%-35% CO2) is introduced, and a crystal shape control agent (citric acid) is added. The amount of citric acid added is 0.5% of the total weight of the lime milk, and the mixture is stirred for carbonization. ⑤ When the pH value of the carbonized slurry is ≤7.5, add a 10% sodium silicate solution, reduce the clean kiln gas to continue carbonization, and after the sodium silicate is added, add a 10% aluminum sulfate solution, and continuously introduce clean kiln gas until the slurry pH value is ≤7; the amount of sodium silicate solution added is 7% of the total weight of the carbonized slurry, and the amount of aluminum sulfate added is 4% of the total weight of the carbonized slurry; ⑥ Add a titanate coupling agent and stir for 1 hour for activation; the amount of the titanate coupling agent added is 2.5% of the total weight of the carbonized slurry; ⑦ Pump into a filter press, filter to obtain a filter cake, and the filter cake is dried, crushed and classified to obtain modified nano calcium carbonate.

[0069] Preparation Example 7

[0070] Zinc nitrate, sodium dihydrogen phosphate and phosphoric acid are mixed in a mass ratio of 3:2:0.6, stirred and microwaved to obtain zinc phosphate sol. Basalt fiber and zinc phosphate sol are mixed in a ratio of 1:10, filtered, and solid matter is retained. The solid matter is dried at 140° C. and crushed to obtain modified basalt fiber.

[0071] Example

[0072] Examples 1-3

[0073] On the one hand, the present application provides a durable aluminum rod, comprising dual-morphic lithium iron phosphate, including an aluminum rod and a durable coating coated on the aluminum rod, wherein the durable coating includes a durable coating, and the durable coating includes the following materials: acrylic resin, film-forming aid, filler, pigment, dispersant, defoamer, thickener, accelerator, mildew inhibitor and water, the specific quality of which is shown in Table 1.

[0074] The acrylic resin is the phosphate-modified acrylic resin 1 prepared in Preparation Example 1, the filler is glass flakes, and the adhesion promoter is the silane coupling agent KH560.

[0075] On the other hand, the present application provides a method for preparing a durable aluminum rod, comprising the following steps:

[0076] S1. Preparation of durable coating: taking acrylic resin, film-forming aid, filler, pigment, dispersant, defoamer, thickener, accelerator, mildewcide and water according to the above parts by weight, stirring and dispersing in a disperser to obtain a durable coating;

[0077] S2. Surface treatment of aluminum rod: Take an untreated aluminum rod and sandblast it with 60-mesh corundum at a pressure of 0.04 MPa, then dry it to obtain a pretreated aluminum rod;

[0078] S3. Aluminum rod preparation: Apply a durable coating on the surface of the pretreated aluminum rod and dry it to obtain an aluminum rod.

[0079] Table 1 Composition of durable coatings in Examples 1-3

[0080]

[0081]

[0082] Example 4

[0083] The difference from Example 2 is that an equal mass of phosphate-modified acrylic acid 2 in Preparation Example 2 is used to replace phosphate-modified acrylic acid 1 in Example 2 to prepare the durable coating.

[0084] Example 5

[0085] The difference from Example 2 is that an equal mass of phosphate-modified acrylic acid 3 in Preparation Example 3 is used to replace phosphate-modified acrylic acid 1 in Example 2 to prepare the durable coating.

[0086] Example 6

[0087] The difference from Example 2 is that the modified glass flakes 1 in Preparation Example 4 of equal mass are used to replace the glass flakes in Example 2 to prepare the durable coating.

[0088] Example 7

[0089] The difference from Example 2 is that the modified glass flakes 2 in Preparation Example 5 of equal mass are used to replace the glass flakes in Example 2 to prepare the durable coating.

[0090] Example 8

[0091] The difference from Example 2 is that the filler includes 15 kg of glass flakes and 3 kg of calcium carbonate to replace the filler in Example 2.

[0092] Example 9

[0093] The difference from Example 2 is that the filler includes 15 kg of glass flakes and 3 kg of modified calcium carbonate prepared in Preparation Example 6, which replace the filler in Example 2.

[0094] Example 10

[0095] The difference from Example 2 is that the filler includes 15 kg of glass flakes, 2 kg of nano-calcium carbonate and 1 kg of basalt fiber to replace the filler in Example 2.

[0096] Example 11

[0097] The difference from Example 2 is that the filler includes 15 kg of glass flakes, 2 kg of nano-calcium carbonate and 1 kg of modified basalt fiber prepared in Preparation Example 7, which replace the filler in Example 2.

[0098] Comparative Example

[0099] Comparative Example 1

[0100] The difference between this comparative example and Example 2 is that the acrylic resin in this comparative example is a water-based acrylic resin.

[0101] Performance testing

[0102] (1) Prepare three samples on aluminum alloy substrates according to GB1727-79 General Preparation Method for Paint Films. After the durable coating is completely dry, the test is carried out under constant temperature and humidity conditions.

[0103] (2) Adhesion performance test: Test the adhesion of the durable coating according to GB / T 9286-1998 Paint and varnish cross-cut test;

[0104] (3) Corrosion resistance test: The corrosion resistance of the durable coating is tested according to GB / T 1763-1979 Determination of resistance of paint films to chemical reagents;

[0105] (4) Impact resistance test: Test the impact resistance of the durable coating according to GB / T 1732-1993 Determination of impact resistance of paint films.

[0106] Table 2 Performance test

[0107]

[0108]

[0109] Combining the performance test comparison in Table 2, we can find that:

[0110] 1. Comparison of Examples 1-3 with Comparative Example 1 reveals that the durable coatings prepared in Examples 1-3 exhibit improved adhesion, saltwater resistance, and impact strength. This demonstrates that the modification of the acrylic resin with the phosphate ester in this application promotes a reaction between the durable coating and the aluminum rod, generating a covalent bond and thereby effectively improving the adhesion of the durable coating to the aluminum rod. Furthermore, due to the excellent antistatic and rust-resistant properties of the phosphate ester, the durable coating's antistatic, rust-resistant, and corrosion-resistant properties are effectively enhanced.

[0111] 2. By comparing Examples 4-5 with Example 2, it can be found that the adhesion, salt water resistance, and impact strength of the durable coatings prepared in Examples 4-5 are all improved. This indicates that the addition amount of the functional monomer is optimized in this application. At an appropriate addition amount, the phosphate ester can fully react with the acrylic acid without acid residue, so that an appropriate amount of phosphate groups is obtained in the modified acrylic acid, which can promote the modified acrylic acid to form a dense protective film on the surface of the aluminum rod.

[0112] 3. Comparison of Examples 6-7 with Example 2 reveals that the durable coatings prepared in Examples 6-7 exhibit improved adhesion, saltwater resistance, and impact strength. This demonstrates that the use of glass flakes as fillers in this application allows them to form a layered, stacked structure within the coating, creating a maze within the coating. This extends the penetration distance of corrosive media such as steam, acid, and alkali into the coating, effectively enhancing the corrosion resistance of the durable coating. Modification of the glass flakes with a silane coupling agent improves their uniform dispersion within the coating.

[0113] 4. Comparison of Examples 8-9 with Example 2 reveals that the durable coatings produced in Examples 8-9 exhibit improved adhesion, saltwater resistance, and impact strength. This demonstrates that calcium carbonate, used in this application to fill the pores between the glass flakes, increases the density of the coating and further enhances its corrosion resistance. Modification of calcium carbonate with aluminum silicate and aluminum sulfate results in a composite coating of silicon dioxide and calcium sulfate on the surface of the calcium carbonate, improving the corrosion resistance of the coating.

[0114] 5. Comparison of Examples 10-11 with Example 2 reveals that the durable coatings produced in Examples 10-11 exhibit improved adhesion, saltwater resistance, and impact strength. This demonstrates that the addition of basalt fiber, acting as a reinforcing and crack-modifying phase, enhances the coating's network structure, improving its density and impact resistance. The zinc phosphate's lamellar structure complements the glass flakes in the coating, creating a labyrinthine structure that further enhances its density.

[0115] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A durable aluminum rod, characterized in that: The invention comprises an aluminum rod and a durable coating applied to the aluminum rod, wherein the durable coating comprises a durable paint, and the durable paint comprises the following materials in parts by weight: 40-60 parts of acrylic resin; 4-8 parts of film-forming aid; 10-25 parts of filler; 8-15 parts of pigment; Dispersant 0.5-1.5 parts; Defoaming agent 0.1-0.5 parts; Thickener 0.1-0.5 parts; 0.5-1 part of accelerator; 0.1-0.5 parts of antifungal agent; 5-10 parts water; The acrylic resin includes an acrylic resin modified by phosphate; The filler includes glass flakes; The filler further comprises any one of micron alumina, silicon carbide powder and calcium carbonate; The filler also includes basalt fiber; The basalt fiber is loaded with zinc phosphate sheets and is prepared by mixing the basalt fiber with a zinc nitrate solution, sequentially adding a urea solution and a sodium dihydrogen phosphate solution to the zinc nitrate solution, performing microwave reaction, filtering, washing, drying, and crushing to obtain the modified basalt fiber.

2. The durable aluminum rod according to claim 1, characterized in that: The preparation of the phosphate-modified acrylic resin comprises: S1. Preparation of functional phosphate ester: Phosphorus pentoxide and hydroxypropyl methacrylate are mixed, heated for esterification, water is added for hydrolysis, and the temperature is raised again for reaction to obtain a functional monomer; S2. Phosphate-modified acrylic acid: functional monomer, acrylic acid and initiator are mixed to obtain a mixed monomer, and the mixed monomer is dropwise added to ethylene glycol butyl ether, and the mixture is heated to react to obtain phosphate-modified acrylic acid; The added amount of the functional monomer is 3%-5% of the total mass of the functional monomer, acrylic acid and initiator.

3. The durable aluminum rod according to claim 1, characterized in that: The glass flakes are glass flakes modified by a silane coupling agent, and the mass ratio of the glass flakes to the silane coupling agent is 1:3-5.

4. The durable aluminum rod according to claim 1, characterized in that: The calcium carbonate is calcium carbonate modified by aluminum silicate and aluminum sulfate.

5. The durable aluminum rod according to claim 4, characterized in that: The calcium carbonate is nano calcium carbonate.

6. The method for preparing a durable aluminum rod according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Preparation of durable coating: taking acrylic resin, film-forming aid, filler, pigment, dispersant, defoamer, thickener, accelerator, mildewcide and water according to the above parts by weight, stirring and dispersing the above materials in a disperser to obtain a durable coating; S2. Surface treatment of aluminum rod: taking an untreated aluminum rod and performing sandblasting on it to obtain a pretreated aluminum rod; S3. Aluminum rod preparation: Apply a durable coating on the surface of the pretreated aluminum rod and dry it to obtain an aluminum rod.

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