Flame-retardant and antibacterial coating for aluminum products and preparation method thereof

Abstract

The present invention provides a flame-retardant antibacterial coating for aluminum products and a preparation method thereof, belonging to the field of coating technology. 3-[3-carboxyallylamide]propyltriethoxysilane-coated magnesium powder is activated with EDC and NHS, and then mixed with 1-aminopropylimidazole hexafluorophosphate-modified graphene oxide and nickel-doped UiO-66-NH2 for reaction, added to epoxy resin, stirred for reaction, and then dimethyl sulfate is added for reaction. A dispersant, a leveling agent, and a solvent are added and mixed to obtain a flame-retardant antibacterial coating for aluminum products. The flame-retardant antibacterial coating for aluminum products prepared by the present invention has good mechanical properties, good flame retardancy and antibacterial properties, and at the same time, has good anti-corrosion effect. After curing, the coating is more uniform and dense, has better performance, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a flame-retardant and antibacterial coating for aluminum products and a preparation method thereof. Background Art

[0002] Aluminum is a lightweight, corrosion-resistant metal with excellent electrical and thermal conductivity, and is widely used in industry and daily life. Aluminum products refer to various products manufactured using aluminum or aluminum alloys as the primary material. Aluminum and its alloys are among the most important materials in the aerospace industry. High-strength aluminum alloys are used in aircraft fuselages, wings, and engine components, effectively reducing aircraft weight and improving fuel efficiency. Furthermore, aluminum components such as engine blocks, wheels, and body frames are widely used, helping to reduce vehicle weight, improve fuel economy, and reduce exhaust emissions. In the construction industry, aluminum products are used in doors, windows, curtain walls, and roofs. Aluminum doors and windows offer excellent sealing, thermal insulation, and corrosion resistance, while aluminum curtain walls are aesthetically pleasing, durable, and easy to maintain. In the electronics industry, aluminum's electrical and thermal conductivity makes it a key material for electronic and electrical products such as computer radiators, mobile phone cases, and wire and cable. Aluminum foil is used in packaging materials, such as food and pharmaceuticals, for its excellent sealing, moisture resistance, and freshness preservation.

[0003] Although aluminum is a non-combustible material, it softens or even melts at high temperatures, losing its structural strength. If aluminum products are used in combination with other combustible materials (such as plastics, rubber, or coatings), the risk of fire increases. In addition, microorganisms such as bacteria and mold are easily attached to the surface of aluminum products, especially in humid or frequently contacted environments. Therefore, the development of a flame-retardant and antibacterial coating for aluminum products can not only make aluminum products have the original advantages of light weight and corrosion resistance, but also add flame retardant and antibacterial functions, extend the service life of aluminum products, and enhance the market competitiveness of the products. Summary of the Invention

[0004] The purpose of the present invention is to propose a flame-retardant and antibacterial coating for aluminum products and a preparation method thereof, which has good mechanical properties, flame retardancy and antibacterial properties, and at the same time, has good anti-corrosion effect. After curing, the coating is more uniform and dense, has better performance, and has broad application prospects.

[0005] The technical solution of the present invention is achieved as follows:

[0006] The invention provides a preparation method of a flame-retardant and antibacterial coating for aluminum products. The method comprises the following steps: activating magnesium powder coated with 3-[3-carboxyallylamide]propyltriethoxysilane with EDC and NHS, mixing the magnesium powder with 1-aminopropylimidazole hexafluorophosphate-modified graphene oxide and nickel-doped UiO-66-NH2, and adding the mixture to an epoxy resin. After stirring for reaction, dimethyl sulfate is added for reaction, and a dispersant, a leveling agent, and a solvent are added and mixed uniformly to prepare the flame-retardant and antibacterial coating for aluminum products.

[0007] As a further improvement of the present invention, the following steps are included:

[0008] S1. adding 1-aminopropyl imidazole hexafluorophosphate to the aqueous dispersion of graphene oxide, stirring the reaction, centrifuging, washing, and drying to obtain ionic liquid-modified graphene oxide;

[0009] S2. Zirconium tetrachloride and 2-aminoterephthalic acid were dissolved in N,N-dimethylformamide, acetic acid and nickel salt were added with stirring, hydrothermal reaction was carried out, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0010] S3. After ball-milling the magnesium powder, adding ethanol, adding 3-[3-carboxyallylamide]propyltriethoxysilane, heating and stirring the reaction, centrifuging, washing, and drying to obtain modified magnesium powder;

[0011] S4. The modified magnesium powder was added to water, NHS and EDC were added, stirred for activation, ionic liquid-modified graphene oxide and nickel-doped UiO-66-NH2 were added, the reaction was stirred, centrifuged, washed, and dried to obtain coated particles;

[0012] S5. The coated particles were added to the epoxy resin, stirred and reacted to obtain a modified epoxy resin;

[0013] S6. The modified epoxy resin was added to acetonitrile, dimethyl sulfate was added, and the reaction was heated and stirred to obtain a modified resin;

[0014] S7. Evenly mix the modified resin, dispersant, leveling agent, and solvent, add the curing agent, and stir to mix evenly to prepare a flame retardant and antibacterial coating for aluminum products.

[0015] As a further improvement of the present invention, the stirring reaction time in step S1 is 1-3 hours, the concentration of the graphene oxide aqueous dispersion is 0.5-1.5 mg / mL, and the mass ratio of the graphene oxide aqueous dispersion to 1-aminopropyl imidazole hexafluorophosphate is 10:2-3.

[0016] As a further improvement of the present invention, the mass ratio of zirconium tetrachloride, 2-aminoterephthalic acid, acetic acid, and nickel salt in step S2 is 14-17:10-13:40-70:1-2, the nickel salt is selected from at least one of nickel chloride, nickel nitrate, and nickel sulfate, and the temperature of the hydrothermal reaction is 110-130° C. and the time is 20-24 hours.

[0017] As a further improvement of the present invention, the ball milling time in step S3 is 0.5-1h, the mass ratio of the magnesium powder and 3-[3-carboxyallylamide]propyltriethoxysilane is 10:3-5, the heating and stirring reaction temperature is 45-55°C, and the time is 2-4h.

[0018] As a further improvement of the present invention, the mass ratio of the modified magnesium powder, NHS, EDC, ionic liquid modified graphene oxide and nickel-doped UiO-66-NH2 in step S4 is 7-9:2-3:3-4:15-20:3-5, the stirring activation temperature is 0-4°C, the time is 20-30min, and the stirring reaction time is 10-12h.

[0019] As a further improvement of the present invention, the mass ratio of the epoxy resin to the coated particles in step S5 is 10:1-2, the stirring and mixing reaction time is 3-5 hours, and the epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin.

[0020] As a further improvement of the present invention, in step S6, the mass ratio of the modified epoxy resin to dimethyl sulfate is 12-15:2-3, the temperature of the heating and stirring reaction is 80-90° C., and the time is 3-5 hours.

[0021] As a further improvement of the present invention, in step S7, the mass ratio of the modified resin, dispersant, leveling agent, curing agent, and solvent is 100:1-2:1-2:10-12:20-30, the solvent is at least one of n-butanol, acetone, ethyl acetate, methyl ethyl ketone, and ethylene glycol ether, the dispersant is BYK-220S, the leveling agent is BYK-345, and the curing agent is triethylenetetramine.

[0022] The present invention further protects a flame retardant and antibacterial coating for aluminum products prepared by the above preparation method.

[0023] The present invention has the following beneficial effects:

[0024] The graphene oxide added in the present invention is a two-dimensional lamellar nanomaterial with a small size effect. It can be filled into the holes and defects of the coating, preventing and delaying the infiltration of small molecule corrosive media into the metal matrix, greatly improving the corrosion resistance of the coating. At the same time, the graphene oxide can be superimposed in the coating, and the fluffy carbon layer formed by the dense physical insulation layer formed synergistically blocks the contact between the substrate and oxygen, preventing the further spread of the fire. It also has a significant smoke suppression effect and has flame retardant and high temperature resistant properties. After modification with ionic liquids, the dispersibility, flame retardancy and corrosion resistance of the graphene oxide in the resin material are greatly improved, the interfacial bonding strength of the material is enhanced, and the mechanical properties and stability of the composite material are improved. At the same time, the imidazole-based ionic liquid also has the effect of enhancing the antibacterial properties of the coating.

[0025] Metal-organic frameworks (MOFs) are crystalline materials composed of metal ions or clusters connected to organic ligands through coordination bonds. Nickel-doped UiO-66-NH2 has a high specific surface area. This hybrid material can significantly enhance the antibacterial properties, greatly improve the antibacterial properties of the coating, and improve the mechanical strength of the coating. At the same time, its amino group further promotes the curing of the epoxy resin, making the epoxy resin cure more uniformly, the coating denser, and the performance better.

[0026] In the present invention, the surface of the magnesium metal powder is modified with a silane coupling agent having a carboxyl group. On the one hand, the coated magnesium powder can be protected by a sacrificial anode to avoid corrosion of the aluminum material. When the magnesium powder is coated with corrosion products, the difficulty of the reaction increases, the open circuit potential of the coating system shifts positively, and the corrosion difficulty increases. On the other hand, the carboxyl structure can also react with ionic liquid-modified graphene oxide with an amino group and nickel-doped UiO-66-NH2 through condensation reaction, thereby promoting the dispersibility of the particles in the epoxy resin, improving the compatibility of the coated particles, and thus improving the mechanical properties of the coating.

[0027] The modified epoxy resin obtained by the reaction is further subjected to a quaternization reaction to obtain a quaternary ammonium salt structure, which further greatly improves the antibacterial properties of the coating. At the same time, the rich N, Si and other substances in the coating also further improve the flame retardancy of the coating.

[0028] The flame retardant and antibacterial coating for aluminum products prepared by the present invention has good mechanical properties, flame retardancy and antibacterial properties, and at the same time, has good anti-corrosion effect. After curing, the coating is more uniform and dense, has better performance, and has broad application prospects. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] NHS, N-hydroxysuccinimide; EDC, 1-ethyl-(3-dimethylaminopropyl)carbodiimide; graphene oxide, purity >99%, sheet diameter 2-4 μm, thickness 1-1.5 nm, purchased from Hepfer New Materials Co., Ltd.

[0031] Example 1

[0032] This embodiment provides a method for preparing a flame-retardant and antibacterial coating for aluminum products, comprising the following steps:

[0033] S1. To 10 parts by weight of a 0.5 mg / mL aqueous dispersion of graphene oxide were added 2 parts by weight of 1-aminopropyl imidazole hexafluorophosphate, the reaction was stirred for 1 h, centrifuged, washed, and dried to obtain ionic liquid-modified graphene oxide;

[0034] S2. 14 parts by weight of zirconium tetrachloride and 10 parts by weight of 2-aminoterephthalic acid were dissolved in 500 parts by weight of N, N-dimethylformamide, 40 parts by weight of acetic acid and 1 part by weight of nickel chloride were added with stirring, heated to 110 ° C, hydrothermally reacted for 20h, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0035] S3. After ball-milling 10 parts by weight of magnesium powder for 0.5h, 200 parts by weight of ethanol were added, 3 parts by weight of 3-[3-carboxyallylamide]propyltriethoxysilane were added, heated to 45 ° C, stirred for 2h, centrifuged, washed, and dried to obtain modified magnesium powder;

[0036] S4. 7 parts by weight of modified magnesium powder was added to 200 parts by weight of water, 2 parts by weight of NHS and 3 parts by weight of EDC were added, and the mixture was stirred and activated at 0°C for 20 min. 15 parts by weight of ionic liquid-modified graphene oxide and 3 parts by weight of nickel-doped UiO-66-NH2 were added, and the reaction was stirred for 10 h, centrifuged, washed, and dried to obtain coated particles.

[0037] S5 was added to 100 parts by weight of bisphenol A epoxy resin coated particles 10 parts by weight, stirring the mixture for 3h to obtain a modified epoxy resin;

[0038] S6 was added to 12 parts by weight of the modified epoxy resin 2 parts by weight of dimethyl sulfate, heated to 80 ° C, stirred for 3h to obtain a modified resin;

[0039] S7. 100 parts by weight of the modified resin, 1 part by weight of the dispersant BYK-220S, 1 part by weight of the leveling agent BYK-345, and 20 parts by weight of n-butanol were stirred and mixed for 15 minutes, 10 parts by weight of triethylenetetramine were added, and the mixture was stirred and mixed for 10 minutes to prepare a flame-retardant antibacterial coating for aluminum products.

[0040] Example 2

[0041] This embodiment provides a method for preparing a flame-retardant and antibacterial coating for aluminum products, comprising the following steps:

[0042] S1. To 10 parts by weight of a 1.5 mg / mL aqueous dispersion of graphene oxide were added 3 parts by weight of 1-aminopropyl imidazole hexafluorophosphate, the reaction was stirred for 3 h, centrifuged, washed, and dried to obtain ionic liquid-modified graphene oxide;

[0043] S2. 17 parts by weight of zirconium tetrachloride and 13 parts by weight of 2-aminoterephthalic acid were dissolved in 500 parts by weight of N, N-dimethylformamide, and 70 parts by weight of acetic acid and 2 parts by weight of nickel nitrate were added with stirring, heated to 130 ° C, hydrothermally reacted for 24h, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0044] S3. After ball-milling 10 parts by weight of magnesium powder for 1h, 200 parts by weight of ethanol were added, 5 parts by weight of 3-[3-carboxyallylamide]propyltriethoxysilane were added, heated to 55 ° C, stirred for 4h, centrifuged, washed, and dried to obtain modified magnesium powder;

[0045] S4. 9 parts by weight of modified magnesium powder were added to 200 parts by weight of water, 3 parts by weight of NHS and 4 parts by weight of EDC were added, and the mixture was stirred and activated at 4 ° C for 30 min. 20 parts by weight of ionic liquid-modified graphene oxide and 5 parts by weight of nickel-doped UiO-66-NH2 were added, and the reaction was stirred for 12 h, centrifuged, washed, and dried to obtain coated particles;

[0046] S5 was added to 100 parts by weight of bisphenol A epoxy resin 20 parts by weight of coated particles, stirred and mixed for 5h to obtain a modified epoxy resin;

[0047] S6 was added to 15 parts by weight of the modified epoxy resin 3 parts by weight of dimethyl sulfate, heated to 90 ° C, and stirred for 5h to obtain a modified resin;

[0048] S7. 100 parts by weight of modified resin, 2 parts by weight of dispersant BYK-220S, 2 parts by weight of leveling agent BYK-345, and 30 parts by weight of ethylene glycol ether were stirred and mixed for 15 minutes, 12 parts by weight of triethylenetetramine were added, and stirred and mixed for 20 minutes to prepare a flame retardant antibacterial coating for aluminum products.

[0049] Example 3

[0050] This embodiment provides a method for preparing a flame-retardant and antibacterial coating for aluminum products, comprising the following steps:

[0051] S1. To 10 parts by weight of a 1 mg / mL aqueous dispersion of graphene oxide was added 2.5 parts by weight of 1-aminopropyl imidazole hexafluorophosphate, the reaction was stirred for 2 h, centrifuged, washed, and dried to obtain ionic liquid-modified graphene oxide;

[0052] S2. 15 parts by weight of zirconium tetrachloride and 11 parts by weight of 2-aminoterephthalic acid were dissolved in 500 parts by weight of N,N-dimethylformamide, 55 parts by weight of acetic acid and 1.5 parts by weight of nickel sulfate were added with stirring, heated to 120 ° C, hydrothermally reacted for 22h, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0053] S3. After ball-milling 10 parts by weight of magnesium powder for 1h, 200 parts by weight of ethanol were added, 4 parts by weight of 3-[3-carboxyallylamide]propyltriethoxysilane were added, heated to 50 ° C, stirred for 3h, centrifuged, washed, and dried to obtain modified magnesium powder;

[0054] S4. 8 parts by weight of modified magnesium powder were added to 200 parts by weight of water, 2.5 parts by weight of NHS and 3.5 parts by weight of EDC were added, and the mixture was stirred and activated at 2 ° C for 25 min. 17 parts by weight of ionic liquid-modified graphene oxide and 4 parts by weight of nickel-doped UiO-66-NH2 were added, and the reaction was stirred for 11 h, centrifuged, washed, and dried to obtain coated particles;

[0055] S5 was added to 100 parts by weight of bisphenol A epoxy resin 15 parts by weight of coated particles, stirred and mixed for 4h to obtain a modified epoxy resin;

[0056] S6 was added to 13 parts by weight of the modified epoxy resin 2.5 parts by weight of dimethyl sulfate, heated to 85 ° C, stirred for 4h to obtain a modified resin;

[0057] S7. 100 parts by weight of the modified resin, 1.5 parts by weight of the dispersant BYK-220S, 1.5 parts by weight of the leveling agent BYK-345, and 25 parts by weight of ethyl acetate were stirred and mixed for 15 minutes, 11 parts by weight of triethylenetetramine were added, and the mixture was stirred and mixed for 15 minutes to prepare a flame-retardant antibacterial coating for aluminum products.

[0058] Comparative Example 1

[0059] Compared with Example 3, the difference is that no ionic liquid modification is performed in step S1.

[0060] The details are as follows:

[0061] S1. 15 parts by weight of zirconium tetrachloride and 11 parts by weight of 2-aminoterephthalic acid were dissolved in 500 parts by weight of N,N-dimethylformamide, 55 parts by weight of acetic acid and a nickel salt were added with stirring, heated to 120 ° C, hydrothermally reacted for 22h, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0062] S2. After ball-milling 10 parts by weight of magnesium powder for 1h, 200 parts by weight of ethanol were added, 4 parts by weight of 3-[3-carboxyallylamide]propyltriethoxysilane were added, heated to 50 ° C, stirred for 3h, centrifuged, washed, and dried to obtain modified magnesium powder;

[0063] S3. 8 parts by weight of modified magnesium powder were added to 200 parts by weight of water, 2.5 parts by weight of NHS and 3.5 parts by weight of EDC were added, and the mixture was stirred and activated at 2 ° C for 25 min. 17 parts by weight of graphene oxide and 4 parts by weight of nickel-doped UiO-66-NH2 were added, and the reaction was stirred for 11 h, centrifuged, washed, and dried to obtain coated particles;

[0064] S4 was added to 100 parts by weight of bisphenol A epoxy resin 15 parts by weight of coated particles, stirred and mixed for 4h to obtain a modified epoxy resin;

[0065] S5 was added to 13 parts by weight of the modified epoxy resin 2.5 parts by weight of dimethyl sulfate, heated to 85 ° C, stirred for 4h to obtain a modified resin;

[0066] S6. 100 parts by weight of modified resin, 1.5 parts by weight of dispersant BYK-220S, 1.5 parts by weight of leveling agent BYK-345, and 25 parts by weight of ethyl acetate were stirred and mixed for 15 minutes, 11 parts by weight of triethylenetetramine were added, and stirred and mixed for 15 minutes to prepare a flame retardant antibacterial coating for aluminum products.

[0067] Comparative Example 2

[0068] Compared with Example 3, the difference is that 3-[3-carboxyallylamide]propyltriethoxysilane modification is not performed in step S3.

[0069] The details are as follows:

[0070] S3. 10 parts by weight of magnesium powder was ball-milled for 1 hour to obtain magnesium powder.

[0071] Comparative Example 3

[0072] Compared with Example 3, the difference is that nickel-doped UiO-66-NH2 is not added in step S4.

[0073] The details are as follows:

[0074] S4. Add 8 parts by weight of modified magnesium powder to 200 parts by weight of water, add 2.5 parts by weight of NHS and 3.5 parts by weight of EDC, stir and activate at 2°C for 25 minutes, add 21 parts by weight of ionic liquid-modified graphene oxide, stir and react for 11 hours, centrifuge, wash, and dry to obtain coated particles.

[0075] Comparative Example 4

[0076] Compared with Example 3, the difference is that no ionic liquid is added to modify graphene oxide in step S4.

[0077] The details are as follows:

[0078] S4. 8 parts by weight of modified magnesium powder were added to 200 parts by weight of water, 2.5 parts by weight of NHS and 3.5 parts by weight of EDC were added, and the mixture was stirred and activated at 2°C for 25 minutes. 21 parts by weight of nickel-doped UiO-66-NH2 was added, and the reaction was stirred for 11 hours. The mixture was centrifuged, washed, and dried to obtain coated particles.

[0079] Comparative Example 5

[0080] Compared with embodiment 3, the difference is that step S6 is not performed.

[0081] The details are as follows:

[0082] S1. To 10 parts by weight of a 1 mg / mL aqueous dispersion of graphene oxide was added 2.5 parts by weight of 1-aminopropyl imidazole hexafluorophosphate, the reaction was stirred for 2 h, centrifuged, washed, and dried to obtain ionic liquid-modified graphene oxide;

[0083] S2. 15 parts by weight of zirconium tetrachloride and 11 parts by weight of 2-aminoterephthalic acid were dissolved in 500 parts by weight of N,N-dimethylformamide, 55 parts by weight of acetic acid and a nickel salt were added with stirring, heated to 120 ° C, hydrothermally reacted for 22h, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2;

[0084] S3. After ball-milling 10 parts by weight of magnesium powder for 1h, 200 parts by weight of ethanol were added, 4 parts by weight of 3-[3-carboxyallylamide]propyltriethoxysilane were added, heated to 50 ° C, stirred for 3h, centrifuged, washed, and dried to obtain modified magnesium powder;

[0085] S4. 8 parts by weight of modified magnesium powder were added to 200 parts by weight of water, 2.5 parts by weight of NHS and 3.5 parts by weight of EDC were added, and the mixture was stirred and activated at 2 ° C for 25 min. 17 parts by weight of ionic liquid-modified graphene oxide and 4 parts by weight of nickel-doped UiO-66-NH2 were added, and the reaction was stirred for 11 h, centrifuged, washed, and dried to obtain coated particles;

[0086] S5 was added to 100 parts by weight of bisphenol A epoxy resin 15 parts by weight of coated particles, stirred and mixed for 4h to obtain a modified epoxy resin;

[0087] S6. 100 parts by weight of modified epoxy resin, 1.5 parts by weight of dispersant BYK-220S, 1.5 parts by weight of leveling agent BYK-345, and 25 parts by weight of ethyl acetate were stirred and mixed for 15 minutes, 11 parts by weight of triethylenetetramine were added, and stirred and mixed for 15 minutes to prepare a flame retardant antibacterial coating for aluminum products.

[0088] Test Example 1

[0089] The flame retardant and antibacterial coatings for aluminum products prepared in Examples 1-3 and Comparative Examples 1-5 were cured to form coatings and then subjected to performance testing.

[0090] Testing was conducted according to the standard GB / T 21866-2008, "Determination of Antimicrobial Activity and Antimicrobial Effect of Antimicrobial Coatings (Paint Films)" (Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923). The coating's limiting oxygen index was tested using an oxygen index meter, and its combustion rating was tested using a horizontal and vertical combustion instrument. The results are shown in Table 1.

[0091] Table 1

[0092]

[0093] It can be seen from the above table that the flame retardant and antibacterial coatings for aluminum products prepared in Examples 1-3 of the present invention have good antibacterial and flame retardant properties.

[0094] Test Example 2

[0095] The flame retardant and antibacterial coatings for aluminum products prepared in Examples 1-3 and Comparative Examples 1-5 were cured to form coatings and then subjected to performance testing.

[0096] Flexibility testing was conducted according to GB / T 1748-1979; impact strength testing was conducted according to GB / T 1732-2020. Adhesion testing was conducted using the pull-off method according to GB / T 5210-2006. Seawater resistance testing was conducted according to GB / T 1733-1993. The results are shown in Table 2.

[0097] Table 2

[0098]

[0099]

[0100] It can be seen from the above table that the flame retardant and antibacterial coatings for aluminum products prepared in Examples 1-3 of the present invention have good comprehensive properties.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a flame retardant and antibacterial coating for aluminum products, characterized in that: The magnesium powder coated with 3-[3-carboxyallylamide]propyltriethoxysilane is activated by EDC and NHS, and then mixed with 1-aminopropylimidazole hexafluorophosphate modified graphene oxide and nickel-doped UiO-66-NH2 for reaction. The mixture is added to epoxy resin and stirred for reaction. Dimethyl sulfate is then added for reaction. A dispersant, a leveling agent, and a solvent are added and mixed uniformly to prepare a flame-retardant and antibacterial coating for aluminum products. The mass ratio of the magnesium powder coated with 3-[3-carboxyallylamide]propyltriethoxysilane, NHS, EDC, 1-aminopropylimidazole hexafluorophosphate modified graphene oxide, and nickel-doped UiO-66-NH2 is 7-9:2-3:3-4:15-20:3-5.

2. The preparation method according to claim 1, characterized in that The following steps are involved: S1. adding 1-aminopropyl imidazole hexafluorophosphate to the aqueous dispersion of graphene oxide, stirring the reaction, centrifuging, washing, and drying to obtain ionic liquid-modified graphene oxide; S2. Zirconium tetrachloride and 2-aminoterephthalic acid were dissolved in N,N-dimethylformamide, acetic acid and nickel salt were added with stirring, hydrothermal reaction was carried out, cooled to room temperature, washed, and dried to obtain nickel-doped UiO-66-NH2; S3. After ball-milling the magnesium powder, adding ethanol, adding 3-[3-carboxyallylamide]propyltriethoxysilane, heating and stirring the reaction, centrifuging, washing, and drying to obtain modified magnesium powder; S4. The modified magnesium powder was added to water, NHS and EDC were added, stirred for activation, ionic liquid-modified graphene oxide and nickel-doped UiO-66-NH2 were added, the reaction was stirred, centrifuged, washed, and dried to obtain coated particles; S5. The coated particles were added to the epoxy resin, stirred and reacted to obtain a modified epoxy resin; S6. The modified epoxy resin was added to acetonitrile, dimethyl sulfate was added, and the reaction was heated and stirred to obtain a modified resin; S7. Evenly mix the modified resin, dispersant, leveling agent, and solvent, add the curing agent, and stir to mix evenly to prepare a flame retardant and antibacterial coating for aluminum products.

3. The preparation method according to claim 2, characterized in that The stirring reaction time in step S1 is 1-3 hours, the concentration of the graphene oxide aqueous dispersion is 0.5-1.5 mg / mL, and the mass ratio of the graphene oxide aqueous dispersion to 1-aminopropyl imidazole hexafluorophosphate is 10:2-3.

4. The preparation method according to claim 2, characterized in that In step S2, the mass ratio of zirconium tetrachloride, 2-aminoterephthalic acid, acetic acid, and nickel salt is 14-17:10-13:40-70:1-2, the nickel salt is selected from at least one of nickel chloride, nickel nitrate, and nickel sulfate, and the hydrothermal reaction temperature is 110-130° C. and the time is 20-24 hours.

5. The preparation method according to claim 2, characterized in that The ball milling time in step S3 is 0.5-1h, the mass ratio of the magnesium powder and 3-[3-carboxyallylamide]propyltriethoxysilane is 10:3-5, the heating and stirring reaction temperature is 45-55°C, and the time is 2-4h.

6. The preparation method according to claim 2, characterized in that The mass ratio of the modified magnesium powder, NHS, EDC, ionic liquid modified graphene oxide and nickel-doped UiO-66-NH2 in step S4 is 7-9:2-3:3-4:15-20:3-5, the stirring activation temperature is 0-4°C, the time is 20-30min, and the stirring reaction time is 10-12h.

7. The preparation method according to claim 2, characterized in that In step S5, the mass ratio of the epoxy resin to the coated particles is 10:1-2, the stirring and mixing reaction time is 3-5 hours, and the epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin.

8. The preparation method according to claim 2, characterized in that In step S6, the mass ratio of the modified epoxy resin to dimethyl sulfate is 12-15:2-3, and the temperature of the heating and stirring reaction is 80-90° C. for 3-5 hours.

9. The preparation method according to claim 2, characterized in that In step S7, the mass ratio of the modified resin, dispersant, leveling agent, curing agent, and solvent is 100:1-2:1-2:10-12:20-30, the solvent is at least one of n-butanol, acetone, ethyl acetate, methyl ethyl ketone, and ethylene glycol ether, the dispersant is BYK-220S, the leveling agent is BYK-345, and the curing agent is triethylenetetramine.

10. A flame retardant and antibacterial coating for aluminum products prepared by the preparation method according to any one of claims 1 to 9.

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