High performance aluminium alloy profile and method for producing the same

Abstract

The application relates to the technical field of aluminum alloys, in particular to a high-performance aluminum alloy profile and a preparation method thereof. A composite nano silicon carbide doped nickel-molybdenum-phosphorus surface is constructed on the surface of the aluminum alloy by chemical plating, and an ionic liquid is selected as an electroplating liquid solvent; a coordination polymer obtained by solvothermal reaction of cerium nitrate, nickel nitrate and 2,2'-iminobenzene dicarboxylic acid is in-situ grown on the nano silicon carbide, and then a hydrophobic antibacterial copolymer containing amino groups is grafted; a micrometer silicon carbide, composite nano silicon carbide and water-based polyurethane emulsion are used to prepare a sealing liquid, the sealing liquid is coated on the surface of an electroplated base material, and light curing treatment is carried out; water-based polyurethane emulsion is prepared by emulsifying isophorone diisocyanate and polytetrahydrofuran ether diol as raw materials, hydroxyl-terminated polydimethylsiloxane as a modifier, dimethylol propionic acid as a hydrophilic chain extender, dimethylamino chalcone and the hydrophobic antibacterial copolymer containing amino groups as end-capping agents, and triethylamine as a neutralizing agent, and then adding deionized water.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy technology, specifically to high-performance aluminum alloy profiles and their preparation methods. Background Technology

[0002] Because aluminum alloys are lightweight, high-strength, and have good electrical conductivity, they are currently widely used in aerospace, shipbuilding, and automotive industries. However, their low hardness, poor wear resistance, and poor corrosion resistance significantly limit their application range.

[0003] Therefore, improving the surface quality and service performance of aluminum alloy profiles is particularly important. The current market usually uses chemical plating to improve the corrosion resistance and wear resistance of aluminum alloy profiles. However, chemical plating generally uses water as a solvent. Due to the complex composition of its plating solution, it is easy to pollute the environment and has problems such as not being able to deposit highly active metals. Summary of the Invention

[0004] The purpose of this invention is to provide high-performance aluminum alloy profiles and their preparation methods to solve the problems in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for preparing high-performance aluminum alloy profiles includes the following steps:

[0007] S1: Using 7071 aluminum alloy as the substrate, after sanding, polishing, water washing, alkali washing, acid washing, and ultrasonic water washing, a pretreated substrate is obtained.

[0008] S2: Prepare an ionic liquid electroplating solution containing composite nano-silicon carbide, place the pretreated substrate into the ionic liquid electroplating solution, and perform electroplating treatment to obtain the electroplated substrate;

[0009] S3: A sealing solution was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion.

[0010] S4: Apply sealing liquid to the surface of electroplated substrate and perform photocuring treatment to obtain high-performance aluminum alloy profiles.

[0011] Furthermore, the composition of the ionic liquid electroplating solution is as follows: using choline chloride-ethylene glycol ionic liquid as solvent, which contains 20 g / L sodium hypophosphite, 10 g / L nickel sulfate, 0.5 g / L sodium molybdate, 2 g / L lactic acid, and (3-5) g / L composite nano silicon carbide.

[0012] Furthermore, the choline chloride-ethylene glycol ionic liquid is prepared by mixing choline chloride and ethylene glycol in a molar ratio of 1:2.

[0013] Furthermore, the electroplating process conditions are: current density 2 mA / cm². 2The temperature was 80-85℃, the time was 2 hours, and the pH was 8.5.

[0014] Furthermore, the working conditions for photocuring are: irradiation with light of wavelength 460nm for 2 hours.

[0015] Furthermore, the mass ratio of micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion is 3:1:(25-35).

[0016] Furthermore, the preparation of composite nano-silicon carbide includes the following steps:

[0017] (1) Mix nano-silicon carbide, 2,2'-iminodibenzoic acid, methanol and triethylamine, add a mixture of methanol, nickel nitrate hexahydrate and cerium nitrate hexahydrate, transfer to a reaction vessel, keep warm at 118-122°C for 2-3 hours, cool, centrifuge, wash and dry to obtain modified nano-silicon carbide;

[0018] (2) Mix modified nano-silicon carbide and deionized water, ultrasonically stir for 5-10 min, add amino-containing hydrophobic antibacterial copolymer, adjust the pH value to 7-9, add dicyclohexylcarbodiimide and N-hydroxysuccinimide in sequence, stir for 3-4 h, filter and dry to obtain composite nano-silicon carbide.

[0019] Furthermore, the preparation of the waterborne polyurethane emulsion includes the following steps:

[0020] 1) Under a nitrogen atmosphere, 4-hydroxy-4'-dimethylaminochalcone, bromoethanol, anhydrous potassium carbonate, and N,N-dimethylformamide were mixed, heated to 88-92℃ and held for 46-48h, cooled, filtered, washed, and dried. The mixture was then crystallized with ethanol and dichloromethane in a volume ratio of 4:1 and dried to obtain 4-hydroxyethoxy-4'-dimethylaminochalcone.

[0021] 2) Under a nitrogen atmosphere, isophorone diisocyanate, polytetrahydrofuran ether diol, hydroxyl-terminated polydimethylsiloxane, and dibutyltin dilaurate are mixed, and a mixture of dimethylolpropionic acid and N-methylpyrrolidone is added. The mixture is stirred for 3-4 hours, 4-hydroxyethoxy-4'-dimethylaminochalcone and an amino-containing hydrophobic antibacterial copolymer are added, and the mixture is stirred for another 4-5 hours. Triethylamine is added, and deionized water is added to emulsify for 1 hour to obtain an aqueous polyurethane emulsion.

[0022] Furthermore, the preparation of the amino-containing hydrophobic antibacterial copolymer includes the following steps:

[0023] A. Mix propanesulfonate lactone and acetone, add a mixture of dimethylaminoethyl acrylate and acetone, heat to 33-37℃ and keep warm for 2-3 hours, filter, and obtain sulfonic acid betaine containing double bonds.

[0024] B. Under a nitrogen atmosphere, acrylamide, acrylic acid, and distilled water are mixed, the pH is adjusted to 7, octadecyl acrylate, sulfonated betaine containing double bonds, tetrasodium ethylenediaminetetraacetate, and urea are added, and the mixture is stirred for 10-20 minutes. Then, 2,2-azobis(2-methylpropylimidazolium) dihydrochloride is added, and the mixture is kept at 38-42℃ for 4-5 hours. After cooling, washing, drying, pulverizing, and sieving, an amino-containing hydrophobic antibacterial copolymer is obtained.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention provides high-performance aluminum alloy profiles and their preparation methods. By limiting the composition and process, high-performance aluminum alloy profiles with green and environmentally friendly properties, high wear resistance, good corrosion resistance, good antibacterial properties, and superhydrophobic surfaces are prepared.

[0027] In this invention, to improve the surface hardness and corrosion resistance of aluminum alloys, a composite nano-silicon carbide-doped nickel-molybdenum-phosphorus surface is constructed on the aluminum alloy surface using chemical plating. Compared with traditional electroplating solutions, this invention selects a choline chloride-ethylene glycol ionic liquid with low toxicity, low vapor pressure, good conductivity, and stability to water and air as the electroplating solution solvent. High-hardness and chemically stable nano-silicon carbide is selected as the coating modifier particle to improve the wear resistance and corrosion resistance of the coating. To improve the uniformity of nano-silicon carbide dispersion in the coating and its migration rate in the ionic liquid, the nano-silicon carbide is modified. In situ growth of a coordination polymer obtained by solvothermal reaction of cerium nitrate, nickel nitrate, and 2,2'-iminodibenzoic acid on nano-silicon carbide is carried out. Then, the carboxyl groups on the surface of the polymer are used to graft an amino-containing hydrophobic antibacterial copolymer. The amino-containing hydrophobic antibacterial copolymer is formed by free radical polymerization using a sulfonic acid betaine containing double bonds generated from acrylamide, acrylic acid, hydrophobic monomers octadecyl acrylate, propanesulfonate lactone, and dimethylaminoethyl acrylate as the antibacterial monomer, and initiated by an azo initiator. This process improves the hydrophobicity and antibacterial properties of nano-silicon carbide, and enhances the antibacterial and corrosion resistance of aluminum alloy profiles.

[0028] To further improve the wear resistance and hydrophobicity of aluminum alloy profiles, a sealing liquid was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and water-based polyurethane emulsion. The sealing liquid was then coated onto the surface of an electroplated substrate and subjected to photocuring. By controlling the mass ratio of micron-sized and nano-sized silicon carbide to water-based polyurethane emulsion, a superhydrophobic, wear-resistant, and corrosion-resistant surface was constructed.

[0029] This invention uses isophorone diisocyanate and polytetrahydrofuran ether diol as raw materials, hydroxyl-terminated polydimethylsiloxane as a modifier, dimethylolpropionic acid as a hydrophilic chain extender, dimethylaminochalcone and amino-containing hydrophobic antibacterial copolymer as end-capping agents, and triethylamine as a neutralizing agent. Deionized water is added for emulsification to obtain an aqueous polyurethane emulsion. The introduction of hydroxyl-terminated polydimethylsiloxane improves the water resistance and thermal stability of the aqueous polyurethane, while the introduction of dimethylaminochalcone enables the aqueous polyurethane to be photocured without the need for additional photoinitiators. Simultaneously, it synergistically enhances the antibacterial effect with the amino-containing hydrophobic antibacterial copolymer, thereby improving the antibacterial performance of aluminum alloy profiles. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, and back, these directional indicators are only used to explain the relative positional relationship and movement of components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0033] Example 1: A method for preparing high-performance aluminum alloy profiles, comprising the following steps:

[0034] S1: Using 7071 aluminum alloy as the substrate, after sanding, polishing, water washing, alkali washing, acid washing, and ultrasonic water washing, a pretreated substrate is obtained.

[0035] S2: Prepare an ionic liquid electroplating solution containing composite nano-silicon carbide, place the pretreated substrate into the ionic liquid electroplating solution, and perform electroplating treatment to obtain the electroplated substrate;

[0036] The composition of the ionic liquid electroplating solution is as follows: using choline chloride-ethylene glycol ionic liquid as solvent, containing 20 g / L sodium hypophosphite, 10 g / L nickel sulfate, 0.5 g / L sodium molybdate, 2 g / L lactic acid, and 3 g / L composite nano silicon carbide.

[0037] The choline chloride-ethylene glycol ionic liquid is prepared by mixing choline chloride and ethylene glycol in a molar ratio of 1:2.

[0038] The electroplating process conditions are: current density 2 mA / cm² 2 The temperature was 80℃, the time was 2 hours, and the pH was 8.5.

[0039] The preparation of the composite nano-silicon carbide includes the following steps:

[0040] (1) Mix 100 mg of nano silicon carbide, 25.7 mg of 2,2'-iminodibenzoic acid, 9 mL of methanol and 20 μL of triethylamine, add 9 mL of methanol, 37.2 mg of nickel nitrate hexahydrate and 9.1 mg of cerium nitrate hexahydrate, transfer to a reaction vessel, keep warm at 118°C for 3 h, cool, centrifuge, wash and dry to obtain modified nano silicon carbide;

[0041] (2) Mix 20mg of modified nano silicon carbide and 40mL of deionized water, stir ultrasonically for 5min, add 40mg of amino-containing hydrophobic antibacterial copolymer, adjust the pH value to 7, add 20mg of dicyclohexylcarbodiimide and 30mg of N-hydroxysuccinimide in sequence, stir for 3h, filter and dry to obtain composite nano silicon carbide.

[0042] The preparation of amino-containing hydrophobic antibacterial copolymers includes the following steps:

[0043] A. Mix 1 mmol propanesulfonate lactone and 10 mL acetone, add a mixture of 1.5 mmol dimethylaminoethyl acrylate and 10 mL acetone, heat to 33°C and keep warm for 3 hours, filter to obtain sulfonic acid betaine containing double bonds.

[0044] B. Under a nitrogen atmosphere, 75 mmol acrylamide, 25 mmol acrylic acid, and 300 mL distilled water were mixed, the pH was adjusted to 7, 0.5 mmol octadecyl acrylate, 70 mg sulfonated betaine containing double bonds, 1 mL tetrasodium ethylenediaminetetraacetate, and 5 mg urea were added, and the mixture was stirred for 10 min. Then, 81 mg 2,2-azobis(2-methylpropylimidazolium) dihydrochloride was added, and the mixture was kept at 38 °C for 5 h. After cooling, washing, drying, pulverizing, and sieving, an amino-containing hydrophobic antibacterial copolymer was obtained.

[0045] S3: A sealing solution was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion.

[0046] The mass ratio of the micron-sized silicon carbide, the composite nano-sized silicon carbide, and the waterborne polyurethane emulsion is 3:1:35.

[0047] The preparation of the aqueous polyurethane emulsion includes the following steps:

[0048] 1) Under a nitrogen atmosphere, 16g of 4-hydroxy-4'-dimethylaminochalcone, 9g of bromoethanol, 12.4g of anhydrous potassium carbonate, and 50mL of N,N-dimethylformamide were mixed, heated to 88℃ and kept at that temperature for 48h, cooled, filtered, washed, and dried. The mixture was then crystallized with ethanol and dichloromethane in a volume ratio of 4:1 and dried to obtain 4-hydroxyethoxy-4'-dimethylaminochalcone.

[0049] 2) Under a nitrogen atmosphere, 10g of isophorone diisocyanate, 12g of polytetrahydrofuran ether diol, 4g of hydroxyl-terminated polydimethylsiloxane, and 2 drops of dibutyltin dilaurate were mixed. Then, a mixture of 1.6g of dimethylolpropionic acid and 3mL of N-methylpyrrolidone was added and stirred for 3h. 5.8g of 4-hydroxyethoxy-4'-dimethylaminochalcone and 3.2g of an amino-containing hydrophobic antibacterial copolymer were added and stirred for another 4h. 1.8g of triethylamine was added and deionized water was added to emulsify for 1h to obtain an aqueous polyurethane emulsion with a solid content of 28%.

[0050] S4: Apply sealing liquid to the surface of electroplated substrate and perform photocuring treatment to obtain high-performance aluminum alloy profiles.

[0051] Example 2: A method for preparing high-performance aluminum alloy profiles, comprising the following steps:

[0052] S1: Using 7071 aluminum alloy as the substrate, after sanding, polishing, water washing, alkali washing, acid washing, and ultrasonic water washing, a pretreated substrate is obtained.

[0053] S2: Prepare an ionic liquid electroplating solution containing composite nano-silicon carbide, place the pretreated substrate into the ionic liquid electroplating solution, and perform electroplating treatment to obtain the electroplated substrate;

[0054] The composition of the ionic liquid electroplating solution is as follows: using choline chloride-ethylene glycol ionic liquid as solvent, containing 20 g / L sodium hypophosphite, 10 g / L nickel sulfate, 0.5 g / L sodium molybdate, 2 g / L lactic acid, and 4 g / L composite nano silicon carbide.

[0055] The choline chloride-ethylene glycol ionic liquid is prepared by mixing choline chloride and ethylene glycol in a molar ratio of 1:2.

[0056] The electroplating process conditions are: current density 2 mA / cm² 2 The temperature was 83℃, the time was 2 hours, and the pH was 8.5.

[0057] The preparation of the composite nano-silicon carbide includes the following steps:

[0058] (1) Mix 100 mg of nano silicon carbide, 25.7 mg of 2,2'-iminodibenzoic acid, 9 mL of methanol and 20 μL of triethylamine, add 9 mL of methanol, 37.2 mg of nickel nitrate hexahydrate and 9.1 mg of cerium nitrate hexahydrate, transfer to a reaction vessel, keep warm at 120°C for 2.5 h, cool, centrifuge, wash and dry to obtain modified nano silicon carbide;

[0059] (2) Mix 20mg of modified nano silicon carbide and 40mL of deionized water, stir ultrasonically for 8min, add 40mg of amino-containing hydrophobic antibacterial copolymer, adjust the pH value to 8, add 20mg of dicyclohexylcarbodiimide and 30mg of N-hydroxysuccinimide in sequence, stir for 3.5h, filter and dry to obtain composite nano silicon carbide.

[0060] The preparation of amino-containing hydrophobic antibacterial copolymers includes the following steps:

[0061] A. Mix 1 mmol propanesulfonate lactone and 10 mL acetone, add a mixture of 1.5 mmol dimethylaminoethyl acrylate and 10 mL acetone, heat to 35°C and keep warm for 2.5 h, filter to obtain sulfonic acid betaine containing double bonds.

[0062] B. Under a nitrogen atmosphere, 75 mmol acrylamide, 25 mmol acrylic acid, and 300 mL distilled water were mixed, the pH was adjusted to 7, 0.5 mmol octadecyl acrylate, 70 mg sulfonated betaine containing double bonds, 1 mL tetrasodium ethylenediaminetetraacetate, and 5 mg urea were added, and the mixture was stirred for 15 min. Then, 81 mg 2,2-azobis(2-methylpropylimidazolium) hydrochloride was added, and the mixture was kept at 40 °C for 4.5 h. After cooling, washing, drying, pulverizing, and sieving, an amino-containing hydrophobic antibacterial copolymer was obtained.

[0063] S3: A sealing solution was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion.

[0064] The mass ratio of the micron-sized silicon carbide, the composite nano-sized silicon carbide, and the waterborne polyurethane emulsion is 3:1:30.

[0065] The preparation of the aqueous polyurethane emulsion includes the following steps:

[0066] 1) Under a nitrogen atmosphere, 16g of 4-hydroxy-4'-dimethylaminochalcone, 9g of bromoethanol, 12.4g of anhydrous potassium carbonate, and 50mL of N,N-dimethylformamide were mixed, heated to 90℃ and kept at that temperature for 47h, cooled, filtered, washed, and dried. The mixture was then crystallized with ethanol and dichloromethane in a volume ratio of 4:1 and dried to obtain 4-hydroxyethoxy-4'-dimethylaminochalcone.

[0067] 2) Under a nitrogen atmosphere, 10g of isophorone diisocyanate, 12g of polytetrahydrofuran ether diol, 4g of hydroxyl-terminated polydimethylsiloxane, and 2 drops of dibutyltin dilaurate were mixed. Then, a mixture of 1.6g of dimethylolpropionic acid and 3mL of N-methylpyrrolidone was added and stirred for 3.5h. 5.8g of 4-hydroxyethoxy-4'-dimethylaminochalcone and 3.2g of an amino-containing hydrophobic antibacterial copolymer were added and stirred for another 4.5h. Finally, 1.8g of triethylamine was added and deionized water was added to emulsify for 1h to obtain an aqueous polyurethane emulsion with a solid content of 28%.

[0068] S4: Apply sealing liquid to the surface of electroplated substrate and perform photocuring treatment to obtain high-performance aluminum alloy profiles.

[0069] Example 3: A method for preparing high-performance aluminum alloy profiles, comprising the following steps:

[0070] S1: Using 7071 aluminum alloy as the substrate, after sanding, polishing, water washing, alkali washing, acid washing, and ultrasonic water washing, a pretreated substrate is obtained.

[0071] S2: Prepare an ionic liquid electroplating solution containing composite nano-silicon carbide, place the pretreated substrate into the ionic liquid electroplating solution, and perform electroplating treatment to obtain the electroplated substrate;

[0072] The composition of the ionic liquid electroplating solution is as follows: using choline chloride-ethylene glycol ionic liquid as solvent, containing 20 g / L sodium hypophosphite, 10 g / L nickel sulfate, 0.5 g / L sodium molybdate, 2 g / L lactic acid, and 5 g / L composite nano silicon carbide.

[0073] The choline chloride-ethylene glycol ionic liquid is prepared by mixing choline chloride and ethylene glycol in a molar ratio of 1:2.

[0074] The electroplating process conditions are: current density 2 mA / cm² 2 The temperature was 85℃, the time was 2 hours, and the pH was 8.5.

[0075] The preparation of the composite nano-silicon carbide includes the following steps:

[0076] (1) Mix 100 mg of nano silicon carbide, 25.7 mg of 2,2'-iminodibenzoic acid, 9 mL of methanol and 20 μL of triethylamine, add 9 mL of methanol, 37.2 mg of nickel nitrate hexahydrate and 9.1 mg of cerium nitrate hexahydrate, transfer to a reaction vessel, keep warm at 122°C for 2 h, cool, centrifuge, wash and dry to obtain modified nano silicon carbide;

[0077] (2) Mix 20mg of modified nano silicon carbide and 40mL of deionized water, stir ultrasonically for 5-10min, add 40mg of amino-containing hydrophobic antibacterial copolymer, adjust the pH value to 9, add 20mg of dicyclohexylcarbodiimide and 30mg of N-hydroxysuccinimide in sequence, stir for 4h, filter and dry to obtain composite nano silicon carbide.

[0078] The preparation of amino-containing hydrophobic antibacterial copolymers includes the following steps:

[0079] A. Mix 1 mmol propanesulfonate lactone and 10 mL acetone, add a mixture of 1.5 mmol dimethylaminoethyl acrylate and 10 mL acetone, heat to 37°C and keep warm for 2 hours, filter, and obtain sulfonic acid betaine containing double bonds.

[0080] B. Under a nitrogen atmosphere, 75 mmol acrylamide, 25 mmol acrylic acid, and 300 mL distilled water were mixed, the pH was adjusted to 7, 0.5 mmol octadecyl acrylate, 70 mg sulfonated betaine containing double bonds, 1 mL tetrasodium ethylenediaminetetraacetate, and 5 mg urea were added. The mixture was stirred for 10-20 min, and 81 mg 2,2-azobis(2-methylpropylimidazolium) dihydrochloride was added. The mixture was kept at 42 °C for 4 h, cooled, washed, dried, pulverized, and sieved to obtain an amino-containing hydrophobic antibacterial copolymer.

[0081] S3: A sealing solution was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion.

[0082] The mass ratio of the micron-sized silicon carbide, the composite nano-sized silicon carbide, and the waterborne polyurethane emulsion is 3:1:25.

[0083] The preparation of the aqueous polyurethane emulsion includes the following steps:

[0084] 1) Under a nitrogen atmosphere, 16g of 4-hydroxy-4'-dimethylaminochalcone, 9g of bromoethanol, 12.4g of anhydrous potassium carbonate, and 50mL of N,N-dimethylformamide were mixed, heated to 92℃ and kept at that temperature for 46h, cooled, filtered, washed, and dried. The mixture was then crystallized with ethanol and dichloromethane in a volume ratio of 4:1 and dried to obtain 4-hydroxyethoxy-4'-dimethylaminochalcone.

[0085] 2) Under a nitrogen atmosphere, 10g of isophorone diisocyanate, 12g of polytetrahydrofuran ether diol, 4g of hydroxyl-terminated polydimethylsiloxane, and 2 drops of dibutyltin dilaurate were mixed. Then, a mixture of 1.6g of dimethylolpropionic acid and 3mL of N-methylpyrrolidone was added and stirred for 4h. 5.8g of 4-hydroxyethoxy-4'-dimethylaminochalcone and 3.2g of an amino-containing hydrophobic antibacterial copolymer were added and stirred for another 5h. 1.8g of triethylamine was added and deionized water was added to emulsify for 1h to obtain an aqueous polyurethane emulsion with a solid content of 28%.

[0086] S4: Apply sealing liquid to the surface of electroplated substrate and perform photocuring treatment to obtain high-performance aluminum alloy profiles.

[0087] Comparative Example 1: Example 3 was used as the control group. Composite nano-silicon carbide was replaced with nano-silicon carbide, and other processes were normal.

[0088] Comparative Example 2: Using Example 3 as the control group, the waterborne polyurethane emulsion was prepared without the addition of an amino-containing hydrophobic antibacterial copolymer, and other processes were normal.

[0089] Comparative Example 3: Using Example 3 as the control group, no amino-containing hydrophobic antibacterial copolymer was prepared, and other processes were normal.

[0090] In the examples and comparative examples, the substrate thickness was 2 mm, and the thickness of the sealing liquid was 100 µm.

[0091] The preparation of 4-hydroxy-4'-dimethylaminochalcone in the examples and comparative examples includes the following steps:

[0092] Mix 13.6g of 4-hydroxyacetophenone with 60mL of ethanol, transfer to an ice-water bath, add 10g of sodium hydroxide and 10mL of deionized water, add a mixture of 15.3g of 4-dimethylaminobenzaldehyde and 50mL of ethanol, stir for 24h, add a mixture of 20g of glacial acetic acid and 30mL of deionized water, wash and dry to obtain 4-hydroxy-4'-dimethylaminochalcone.

[0093] Sources of raw materials used (for illustrative purposes only):

[0094] 7071 aluminum alloy: By mass fraction, its elemental composition is: zinc 6.36%, magnesium 1.94%, copper 2.61%, zirconium 0.086%, chromium 0.02%, titanium 0.03%, iron 0.08%, with the balance being aluminum; polytetrahydrofuran ether diol PTMEG-1000: Shandong Suihua Biotechnology Co., Ltd.; hydroxyl-terminated polydimethylsiloxane: Hubei Xinmingtai Chemical Co., Ltd.; sodium hypophosphite S486577, nickel sulfate N10021 5. Sodium molybdate S194956, lactic acid L108839, choline chloride C108896, ethylene glycol E103319, nano silicon carbide S104653, 2,2'-iminodibenzoic acid I171078, triethylamine T103285, nickel nitrate hexahydrate N108891, cerium nitrate hexahydrate C431279, dicyclohexylcarbodiimide D106074, N-hydroxysuccinimide H109330, propanesulfonic acid lactone P 105652, Dimethylaminoethyl acrylate D111129, Acrylamide A108465, Acrylic acid A615488, Octadecyl acrylate S161395, Tetrasodium ethylenediaminetetraacetate B301167, Urea U111897, 2,2-Azobis(2-methylpropylimidazolium) hydrochloride A101386, Micronized silicon carbide S104651, 4-Hydroxyacetophenone H102969, 4-Dimethylaminobenzaldehyde D1 09640, Bromoethanol B111177, N,N-Dimethylformamide D111999, Isophorone diisocyanate I109582, Dibutyltin dilaurate D100274, Dimethylolpropionic acid D165817, N-Methylpyrrolidone M119668, Triethylamine T103285: Aladdin Reagent; Methanol, Sodium hydroxide, Acetone, Anhydrous potassium carbonate, Glacial acetic acid, Ethanol, Dichloromethane, Analytical grade: Sinopharm Group Reagent.

[0095] Performance testing: The profiles obtained from the examples and comparative examples were tested.

[0096] Hydrophobicity: Characterized by water contact angle, measured using a contact angle meter with 5 μL of deionized water as the test droplet; Antibacterial properties: Tested using the plate method with Staphylococcus aureus as the test species; Abrasion resistance: The sample was placed on 800-grit sandpaper with a 2.5 kg weight on it. Each 10 cm was considered a wear cycle, and the sample was dragged at a speed of 5 mm / s for 20 cycles. The contact angle was measured and compared with the initial contact angle. A contact angle change rate of less than 2% (including 2%) indicates excellent abrasion resistance; otherwise, it is considered unqualified; Corrosion resistance: Tested according to GB / T1771-2007, at a temperature of 36.8℃, a sodium chloride concentration of 61 g / L, a pH of 6.9, and a time of 1000 h. Observation was made for blistering, damage, corrosion, etc. The absence of these phenomena indicates excellent resistance; otherwise, it is considered unqualified. The results are shown in Table 1.

[0097] Table 1

[0098]

[0099] This invention provides high-performance aluminum alloy profiles and their preparation methods. By limiting the composition and process, high-performance aluminum alloy profiles with green and environmentally friendly properties, high wear resistance, good corrosion resistance, good antibacterial properties, and superhydrophobic surfaces are prepared. In Table 1, / indicates that the item was not tested.

[0100] Comparing Example 3 with Comparative Examples 1 and 3, it can be seen that in order to improve the surface hardness and corrosion resistance of aluminum alloys, chemical plating is used to construct a composite nano-silicon carbide-doped nickel-molybdenum-phosphorus surface on the aluminum alloy surface. Compared with traditional electroplating solutions, this invention uses a choline chloride-ethylene glycol ionic liquid with low toxicity, low vapor pressure, good conductivity, and stability to water and air as the electroplating solution solvent, and selects nano-silicon carbide with high hardness and good chemical stability as the coating modifier particles to improve the wear resistance and corrosion resistance of the coating. In order to improve the uniformity of nano-silicon carbide dispersion in the coating and its migration rate in the ionic liquid, the nano-silicon carbide is further modified. Silicon carbide is modified by in-situ growth of a coordination polymer obtained by solvothermal reaction of cerium nitrate, nickel nitrate, and 2,2'-iminodibenzoic acid on nano-silicon carbide. Then, the carboxyl groups on the surface of the polymer are used to graft an amino-containing hydrophobic antibacterial copolymer. The amino-containing hydrophobic antibacterial copolymer is formed by free radical polymerization using a sulfonic acid betaine containing double bonds generated from acrylamide, acrylic acid, hydrophobic monomers octadecyl acrylate, propanesulfonate lactone, and dimethylaminoethyl acrylate as the antibacterial monomer. This process improves the hydrophobicity and antibacterial properties of nano-silicon carbide, and enhances the antibacterial and corrosion resistance of aluminum alloy profiles.

[0101] Comparing Example 3 with Comparative Examples 2 and 3, it can be seen that in this invention, isophorone diisocyanate and polytetrahydrofuran ether diol are used as raw materials, hydroxyl-terminated polydimethylsiloxane is used as a modifier, dimethylolpropionic acid is used as a hydrophilic chain extender, dimethylaminochalcone and amino-containing hydrophobic antibacterial copolymer are used as end-capping agents, triethylamine is used as a neutralizing agent, and deionized water is added for emulsification to obtain a waterborne polyurethane emulsion. The introduction of hydroxyl-terminated polydimethylsiloxane improves the water resistance and thermal stability of the waterborne polyurethane, while the introduction of dimethylaminochalcone enables the waterborne polyurethane to be photocured without the need for additional photoinitiators. At the same time, it has a synergistic antibacterial effect with the amino-containing hydrophobic antibacterial copolymer, thereby improving the antibacterial performance of aluminum alloy profiles.

[0102] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the present invention's specification under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing high-performance aluminum alloy profiles, characterized in that, Includes the following steps: S1: Using 7071 aluminum alloy as the substrate, after sanding, polishing, water washing, alkali washing, acid washing, and ultrasonic water washing, a pretreated substrate is obtained. S2: Prepare an ionic liquid electroplating solution containing composite nano-silicon carbide, place the pretreated substrate into the ionic liquid electroplating solution, and perform electroplating treatment to obtain the electroplated substrate; S3: A sealing solution was prepared using micron-sized silicon carbide, composite nano-sized silicon carbide, and waterborne polyurethane emulsion. S4: Apply sealing liquid to the surface of electroplated substrate and perform photocuring treatment to obtain high-performance aluminum alloy profiles; The composition of the ionic liquid electroplating solution is as follows: choline chloride-ethylene glycol ionic liquid is used as solvent, which contains 20 g / L sodium hypophosphite, 10 g / L nickel sulfate, 0.5 g / L sodium molybdate, 2 g / L lactic acid, and (3-5) g / L composite nano silicon carbide. The preparation of the composite nano-silicon carbide includes the following steps: (1) Mix nano-silicon carbide, 2,2'-iminodibenzoic acid, methanol and triethylamine, add a mixture of methanol, nickel nitrate hexahydrate and cerium nitrate hexahydrate, transfer to a reaction vessel, keep warm at 118-122°C for 2-3 hours, cool, centrifuge, wash and dry to obtain modified nano-silicon carbide; (2) Mix modified nano-silicon carbide and deionized water, ultrasonically stir for 5-10 min, add amino-containing hydrophobic antibacterial copolymer, adjust the pH value to 7-9, add dicyclohexylcarbodiimide and N-hydroxysuccinimide in sequence, stir for 3-4 h, filter and dry to obtain composite nano-silicon carbide. The preparation of amino-containing hydrophobic antibacterial copolymers includes the following steps: A. Mix propanesulfonate lactone and acetone, add a mixture of dimethylaminoethyl acrylate and acetone, heat to 33-37℃ and keep warm for 2-3 hours, filter, and obtain sulfonic acid betaine containing double bonds. B. Under a nitrogen atmosphere, acrylamide, acrylic acid, and distilled water are mixed, the pH is adjusted to 7, octadecyl acrylate, sulfonated betaine containing double bonds, tetrasodium ethylenediaminetetraacetate, and urea are added, and the mixture is stirred for 10-20 minutes. Then, 2,2-azobis(2-methylpropylimidazolium) dihydrochloride is added, and the mixture is kept at 38-42℃ for 4-5 hours. After cooling, washing, drying, pulverizing, and sieving, an amino-containing hydrophobic antibacterial copolymer is obtained.

2. The method for preparing high-performance aluminum alloy profiles according to claim 1, characterized in that, Choline chloride-ethylene glycol ionic liquid is prepared by mixing choline chloride and ethylene glycol in a molar ratio of 1:

2.

3. The method for preparing high-performance aluminum alloy profiles according to claim 1, characterized in that, The electroplating process conditions are: current density 2 mA / cm² 2 The temperature was 80-85℃, the time was 2 hours, and the pH was 8.

5.

4. The method for preparing high-performance aluminum alloy profiles according to claim 1, characterized in that, The working conditions for photocuring are: irradiation with light of wavelength 460nm for 2 hours.

5. The method for preparing high-performance aluminum alloy profiles according to claim 1, characterized in that, The mass ratio of the micron-sized silicon carbide, the composite nano-sized silicon carbide, and the waterborne polyurethane emulsion is 3:1:(25-35).

6. The method for preparing high-performance aluminum alloy profiles according to claim 1, characterized in that, The preparation of the aqueous polyurethane emulsion includes the following steps: 1) Under a nitrogen atmosphere, 4-hydroxy-4'-dimethylaminochalcone, bromoethanol, anhydrous potassium carbonate, and N,N-dimethylformamide were mixed, heated to 88-92℃ and held for 46-48h, cooled, filtered, washed, and dried. The mixture was then crystallized with ethanol and dichloromethane in a volume ratio of 4:1 and dried to obtain 4-hydroxyethoxy-4'-dimethylaminochalcone. 2) Under a nitrogen atmosphere, isophorone diisocyanate, polytetrahydrofuran ether diol, hydroxyl-terminated polydimethylsiloxane, and dibutyltin dilaurate are mixed, and a mixture of dimethylolpropionic acid and N-methylpyrrolidone is added. The mixture is stirred for 3-4 hours, 4-hydroxyethoxy-4'-dimethylaminochalcone and an amino-containing hydrophobic antibacterial copolymer are added, and the mixture is stirred for another 4-5 hours. Triethylamine is added, and deionized water is added to emulsify for 1 hour to obtain an aqueous polyurethane emulsion.

7. A high-performance aluminum alloy profile, characterized in that, It is prepared by the preparation method described in any one of claims 1-6.

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