Environmentally friendly anti-corrosion coating for inner wall of aqueous aerosol can and preparation method thereof

Abstract

The present invention discloses an environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can and a preparation method thereof, relating to the technical field of aerosol cans, wherein the environmentally friendly anti-corrosion coating contains quantum dots and bismuth oxide; the mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7-8%; the mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2-0.4%; the environmentally friendly anti-corrosion coating also includes: epoxy resin, diluent, toughening agent, sucrose stearate, defoaming agent, coupling agent, leveling agent, curing agent; the environmentally friendly anti-corrosion coating prepared by the present invention is mainly used for spraying on the inner wall of a water-based aerosol can to form a stable corrosion-resistant coating, thereby effectively avoiding the corrosive effect of the water-based aerosol medium on the aerosol can body. By spraying the environmentally friendly anti-corrosion coating of the present invention on the inner wall of the water-based aerosol can, a coating with high hardness and corrosion resistance can be formed, which can protect the surface of the aerosol can body from being eroded by the medium.

Description

Technical Field

[0001] The invention belongs to the technical field of aerosol cans, in particular to an environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can and a preparation method thereof. Background Art

[0002] Aerosol refers to a drug-containing emulsion or suspension sealed together with a suitable propellant in an aerosol can. When used, the content is sprayed out in the form of mist with the help of the pressure of the propellant. Its applications include pharmaceuticals (aerosol inhalation drug delivery), cosmetics (common ones such as hydrating aerosol), daily chemicals (spray paint), building materials (foaming glue), industrial products (cleaners, release agents), food (aerosol cooking oil, cream aerosol), automobiles (car interior cleaning agents), etc.; it is prevalent in the health, home, medicine, spray paint and other industries.

[0003] As the current social development theme is mainly green and environmental protection, the application of aqueous aerosols has been continuously expanded.

[0004] The main performance requirements of aerosol cans used to seal aerosols are pressure resistance, sealing, corrosion resistance and surface quality. Aerosol cans come in a variety of sizes and shapes, sealing a variety of aerosols.

[0005] The inner wall of the aerosol can is in direct contact with the aerosol. Therefore, the corrosion resistance of the inner wall of the aerosol can is required to be high, and it cannot have penetrating contamination to the aerosol.

[0006] Based on this, an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can and a preparation method thereof are provided to solve the existing technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can and a preparation method thereof, so as to overcome the deficiencies in the prior art.

[0008] The technical solution adopted in the present invention is as follows:

[0009] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0010] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7-8%;

[0011] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2-0.4%;

[0012] The environmentally friendly anti-corrosion coating also includes: epoxy resin, diluent, toughening agent, sucrose stearate, defoaming agent, coupling agent, leveling agent, and curing agent.

[0013] As a further technical solution, the quantum dot preparation method is:

[0014] (1) placing the nano bentonite under inert atmosphere protection, calcining for 1 hour, and then cooling to room temperature to obtain calcined nano bentonite;

[0015] (2) adding the asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring the reaction at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir the reaction for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir the reaction for 5 hours, and then terminating the reaction;

[0016] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots.

[0017] As a further technical solution, the inert atmosphere in step (1) is nitrogen or neon;

[0018] The calcination temperature is 600-620°C.

[0019] As a further technical solution, the mixing ratio of asphalt powder and concentrated nitric acid in step (2) is 10-15g:200mL;

[0020] The mass fraction of the concentrated nitric acid is 60%.

[0021] As a further technical solution, in step (2), the mixing ratio of asphalt powder and calcined nano-bentonite is 20:1-1.6.

[0022] As a further technical solution, the vacuum drying temperature in step (3) is 50° C. and the time is 65 minutes.

[0023] As a further technical solution, the environmentally friendly anti-corrosion coating further comprises the following components in parts by weight: 42-45 parts of epoxy resin, 6-8 parts of diluent, 0.3-0.6 parts of sucrose stearate, 1-1.2 parts of defoaming agent, 1-1.5 parts of coupling agent, 0.2-0.3 parts of leveling agent, and 20-24 parts of curing agent;

[0024] The epoxy resin is a phenolic epoxy resin.

[0025] As a further technical solution, the diluent is: ethylene glycol diglycidyl ether;

[0026] The defoaming agent is an organosilicon defoaming agent.

[0027] As a further technical solution: the coupling agent is bis(γ-triethoxysilylpropyl)tetrasulfide;

[0028] The leveling agent is: acrylic leveling agent;

[0029] The curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0030] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0031] A method for preparing an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can comprises the following steps:

[0032] S1. Weigh the components according to the dosage ratio of each component;

[0033] S2. First, epoxy resin, diluent, sucrose stearate, and defoamer are mixed together and sheared and dispersed for 30 minutes to obtain a dispersion;

[0034] S3, adding quantum dots, bismuth oxide, a coupling agent, a leveling agent, and a curing agent to the dispersion obtained in S2 in sequence, stirring for 1 hour to obtain a mixed solution;

[0035] The stirring speed is 3000r / min;

[0036] S4. Finally, add a curing agent to the mixed solution obtained in S3, and continue stirring and mixing until uniform.

[0037] Beneficial effects:

[0038] The environmentally friendly anti-corrosion coating prepared by the present invention is mainly used for spraying the inner wall of an aqueous aerosol can to form a stable corrosion-resistant coating, thereby effectively preventing the aqueous aerosol medium from corroding the aerosol can body.

[0039] By spraying the environmentally friendly anti-corrosion coating of the present invention on the inner wall of the water-based aerosol can, a coating with high hardness and corrosion resistance can be formed, which can protect the surface of the aerosol can from being corroded by the medium.

[0040] The present invention introduces specially prepared quantum dots that are uniformly dispersed in the coating system and combined with the epoxy resin molecular chains to stabilize the coating structure, significantly improving both hardness and toughness. Due to the greatly improved stability, the corrosion resistance of the coating surface can be improved. In addition, the presence of quantum dots and bismuth oxide can promote the formation of a stable bonding structure between the coating and the inner wall of the can, mainly based on chemical bonds. This is because the coating can react with the metal surface of the inner wall of the aerosol can to form stable chemical bonds, thereby allowing the coating to be firmly adsorbed on the inner wall metal surface, greatly improving the bonding between the coating and the inner wall metal, and thus increasing the corrosion resistance of the inner wall of the aerosol can.

[0041] The present invention introduces an acrylic leveling agent, which mainly functions to reduce the surface tension of the coating. When the leveling agent molecules dissolve on the surface, their polar ends are adsorbed on the surface, while their non-polar ends face the air. This increases the distance between molecules on the liquid surface, reduces the liquid surface tension, and makes it easier for the liquid to flow and spread on the inner surface of the aerosol can, thereby forming a flat and smooth coating on the inner surface of the aerosol can.

[0042] The present invention optimizes the composition of the coating and avoids the use of solvents. In this way, the formed coating structure is more stable and dense, and components will not penetrate into the medium in the vaporization tank, causing the problem of contaminating the medium in the aerosol tank. Therefore, the environmentally friendly coating prepared by the present invention is used on the inner wall of the aerosol tank, which is safer and more reliable. DETAILED DESCRIPTION

[0043] 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.

[0044] The following are specific embodiments:

[0045] Example 1

[0046] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0047] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7%;

[0048] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2%;

[0049] The method for preparing quantum dots is as follows:

[0050] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 600°C;

[0051] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 10g:200mL;

[0052] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.

[0053] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0054] The environmentally friendly anti-corrosion coating also includes the following components by weight: 42 parts of phenolic epoxy resin, 6 parts of ethylene glycol diglycidyl ether, 0.3 parts of sucrose stearate, 1 part of silicone defoamer, 1 part of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.2 parts of acrylic leveling agent, and 20 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0055] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0056] Example 2

[0057] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0058] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7.2%;

[0059] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.25%;

[0060] The method for preparing quantum dots is as follows:

[0061] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 605°C;

[0062] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 12g:200mL;

[0063] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.2.

[0064] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0065] The environmentally friendly anti-corrosion coating also includes the following components by weight: 44 parts of phenolic epoxy resin, 8 parts of ethylene glycol diglycidyl ether, 0.6 parts of sucrose stearate, 1 part of silicone defoamer, 1.2 parts of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.25 parts of acrylic leveling agent, and 21 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0066] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0067] Example 3

[0068] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0069] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7.3%;

[0070] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.3%;

[0071] The method for preparing quantum dots is as follows:

[0072] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 615°C;

[0073] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 13g:200mL;

[0074] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.4.

[0075] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0076] The environmentally friendly anti-corrosion coating also includes the following components by weight: 43 parts of phenolic epoxy resin, 6.5 parts of ethylene glycol diglycidyl ether, 0.4 parts of sucrose stearate, 1.1 parts of silicone defoamer, 1.2 parts of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.25 parts of acrylic leveling agent, and 22 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0077] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0078] Example 4

[0079] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0080] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7.6%;

[0081] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.38%;

[0082] The method for preparing quantum dots is as follows:

[0083] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 610°C;

[0084] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 13g:200mL;

[0085] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.5.

[0086] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0087] The environmentally friendly anti-corrosion coating also includes the following components by weight: 44 parts of phenolic epoxy resin, 7 parts of ethylene glycol diglycidyl ether, 0.5 parts of sucrose stearate, 1.1 parts of silicone defoamer, 1.4 parts of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.28 parts of acrylic leveling agent, and 23 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0088] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0089] Example 5

[0090] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing quantum dots and bismuth oxide;

[0091] The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 8%;

[0092] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.4%;

[0093] The method for preparing quantum dots is as follows:

[0094] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 620°C;

[0095] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 15g:200mL;

[0096] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.6.

[0097] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0098] The environmentally friendly anti-corrosion coating also includes the following components by weight: 45 parts of phenolic epoxy resin, 8 parts of ethylene glycol diglycidyl ether, 0.6 parts of sucrose stearate, 1.2 parts of silicone defoamer, 1.5 parts of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.3 parts of acrylic leveling agent, and 24 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0099] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0100] The above embodiment preparation method is:

[0101] A method for preparing an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can comprises the following steps:

[0102] S1. Weigh the components according to the dosage ratio of each component;

[0103] S2. First, epoxy resin, diluent, sucrose stearate, and defoamer are mixed together and sheared and dispersed for 30 minutes to obtain a dispersion;

[0104] S3, adding quantum dots, bismuth oxide, a coupling agent, a leveling agent, and a curing agent to the dispersion obtained in S2 in sequence, stirring for 1 hour to obtain a mixed solution;

[0105] The stirring speed is 3000r / min;

[0106] S4. Finally, add a curing agent to the mixed solution obtained in S3, and continue stirring and mixing until uniform.

[0107] Comparative Example 1:

[0108] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing bismuth oxide;

[0109] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2%;

[0110] The environmentally friendly anti-corrosion coating also includes the following components by weight: 42 parts of phenolic epoxy resin, 6 parts of ethylene glycol diglycidyl ether, 0.3 parts of sucrose stearate, 1 part of silicone defoamer, 1 part of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.2 parts of acrylic leveling agent, and 20 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0111] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0112] Comparative Example 2:

[0113] An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, the environmentally friendly anti-corrosion coating containing bentonite and bismuth oxide;

[0114] The mass fraction of bentonite in the environmentally friendly anti-corrosion coating is 7%;

[0115] The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2%;

[0116] The method for preparing quantum dots is as follows:

[0117] (1) calcining the nano-bentonite under nitrogen protection for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; the calcination temperature is 600°C;

[0118] (2) adding asphalt powder to the reactor, and then adding concentrated nitric acid, and performing electromagnetic stirring treatment, first stirring and reacting at 60°C for 40 minutes, then adjusting the temperature to 80°C, continuing to stir and react for 15 minutes, and finally adjusting the temperature to 100°C, and adding the calcined nano-bentonite prepared in step (1), continuing to stir and react for 5 hours, and then terminating the reaction; the mixing ratio of asphalt powder and concentrated nitric acid is 10g:200mL;

[0119] The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder and the calcined nano-bentonite is 20:1.

[0120] (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system, and the mixture is stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation, and the mixture is vacuum dried to obtain quantum dots; the vacuum drying temperature is 50°C and the time is 65 minutes.

[0121] The environmentally friendly anti-corrosion coating also includes the following components by weight: 42 parts of phenolic epoxy resin, 6 parts of ethylene glycol diglycidyl ether, 0.3 parts of sucrose stearate, 1 part of silicone defoamer, 1 part of bis(γ-triethoxysilylpropyl) tetrasulfide, 0.2 parts of acrylic leveling agent, and 20 parts of curing agent; the curing agent is a mixture of tetraethylene pentamine and diethylene triamine;

[0122] The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:1.

[0123] test:

[0124] The embodiment and the comparative example were respectively sprayed evenly onto the surface of a flat glass, and after curing at 50°C for 4 hours, the difference in coating thickness did not exceed 1 micron;

[0125] The salt spray resistance test method uses a programmable salt spray corrosion test chamber and is tested in accordance with the JH / T E06-2015 standard. The specific results are shown in Table 1:

[0126] Table 1

[0127] Salt spray resistance / h Example 1 402 Example 2 407 Example 3 412 Example 4 416 Example 5 421 Comparative Example 1 365 Comparative Example 2 376

[0128] It can be seen from Table 1 that the environmentally friendly anti-corrosion coating for the inner wall of the water-based aerosol can prepared in the embodiment has high corrosion resistance.

[0129] Using Example 1 as the base sample, the effects of different quantum dot mass fractions on adhesion were compared;

[0130] Adhesion was tested using BGD503 cross-grid board according to GB 1720-1989:

[0131] Table 2

[0132]

[0133]

[0134] It can be seen from Table 2 that with the increase of quantum dot content, the coating adhesion first increases and then decreases.

[0135] The coating hardness of the sample was tested using a BGD506 hardness tester in accordance with GB / T 6739-2006.

[0136] Table 3

[0137] Coating hardness Example 1 2H Example 2 2H Example 3 2H Example 4 2H Example 5 2H

[0138] It can be seen from Table 3 that the coating film formed by the coating in the present invention has a higher hardness.

[0139] The above description is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to the embodiment shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description, should be within the scope of protection of the present invention.

Claims

1. An environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can, characterized in that: The environmentally friendly anti-corrosion coating contains quantum dots and bismuth oxide; The mass fraction of quantum dots in the environmentally friendly anti-corrosion coating is 7-8%; The mass fraction of bismuth oxide in the environmentally friendly anti-corrosion coating is 0.2-0.4%; The environmentally friendly anti-corrosion coating further comprises: 42-45 parts of epoxy resin, 6-8 parts of diluent, 0.3-0.6 parts of sucrose stearate, 1-1.2 parts of defoaming agent, 1-1.5 parts of coupling agent, 0.2-0.3 parts of leveling agent, and 20-24 parts of curing agent; The quantum dot preparation method is: (1) calcining the nano-bentonite under an inert atmosphere for 1 hour, and then cooling to room temperature to obtain calcined nano-bentonite; (2) Add asphalt powder to the reactor, then add concentrated nitric acid, and perform electromagnetic stirring treatment. First, stir and react at 60°C for 40 minutes, then adjust the temperature to 80°C, continue stirring and reacting for 15 minutes, and finally adjust the temperature to 100°C. In addition, add the calcined nano-bentonite prepared in step (1), continue stirring and reacting for 5 hours, and terminate the reaction. The mixing ratio of the asphalt powder and concentrated nitric acid is 10-15g:200mL; the mixing ratio of the asphalt powder and calcined nano-bentonite is 20:1-1.6; the mass fraction of the concentrated nitric acid is 60%; (3) After the reaction is completed, the mixture is cooled to room temperature, and then 10% deionized water is added to the reaction system and stirred for 30 minutes. The remaining nitric acid is removed by vacuum distillation and the mixture is vacuum dried to obtain quantum dots.

2. The environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can according to claim 1, characterized in that: The inert atmosphere in step (1) is nitrogen or neon; The calcination temperature is 600-620°C.

3. The environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can according to claim 1, characterized in that: In step (3), the vacuum drying temperature is 50°C and the time is 65 minutes.

4. The environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can according to claim 1, characterized in that: The epoxy resin is a novolac epoxy resin.

5. The environmentally friendly anti-corrosion coating for the inner wall of a water-based aerosol can according to claim 1, characterized in that: The diluent is: ethylene glycol diglycidyl ether; The defoaming agent is an organosilicon defoaming agent.

6. The method for preparing an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can according to claim 1, characterized in that: The coupling agent is bis(γ-triethoxysilylpropyl)tetrasulfide; The leveling agent is: acrylic leveling agent; The curing agent is a mixture of tetraethylene pentamine and diethylene triamine; The mixing mass ratio of the tetraethylene pentamine to the diethylene triamine is 5:

1.

7. The method for preparing an environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can according to claim 1, characterized in that: The following steps are involved: S1. Weigh the components according to the dosage ratio of each component; S2. First, epoxy resin, diluent, sucrose stearate, and defoamer are mixed together and sheared and dispersed for 30 minutes to obtain a dispersion; S3, adding quantum dots, bismuth oxide, a coupling agent, a leveling agent, and a curing agent to the dispersion obtained in S2 in sequence, stirring for 1 hour to obtain a mixed solution; The stirring speed is 3000r / min; S4. Finally, add a curing agent to the mixed solution obtained in S3, and continue stirring and mixing until uniform.

Images