CN118546596B

CN118546596B - Environmentally friendly anti-corrosion coating for inner wall of aqueous aerosol can and preparation method thereof

Info

Publication number: CN118546596B
Application number: CN202410729404.8A
Authority: CN
Inventors: 俞开皋; 杨鸯群; 梅艳
Original assignee: Taizhou Luchuang Packaging Container Co ltd
Current assignee: Taizhou Luchuang Packaging Container Co ltd
Priority date: 2024-06-06
Filing date: 2024-06-06
Publication date: 2025-09-26
Anticipated expiration: 2044-06-06
Also published as: CN118546596A

Abstract

The invention discloses an environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can and a preparation method thereof, and relates to the technical field of aerosol cans, wherein the environment-friendly anticorrosive paint contains 7-8% of quantum dots and bismuth oxide, the mass fraction of the bismuth oxide in the environment-friendly anticorrosive paint is 0.2-0.4%, the environment-friendly anticorrosive paint also comprises epoxy resin, a thinner, a toughening agent, sucrose stearate, a defoaming agent, a coupling agent, a leveling agent and a curing agent, and the environment-friendly anticorrosive paint prepared by the invention is mainly used for spraying the inner wall of the aqueous aerosol can to form a stable corrosion-resistant coating, so that the corrosion effect of an aqueous aerosol medium on the aerosol can be effectively avoided. After the environment-friendly anticorrosive paint is sprayed on the inner wall of the aqueous aerosol can, a coating with high hardness and corrosion resistance can be formed, and the surface of the aerosol can body can be protected from being corroded by a medium.

Description

Environment-friendly anticorrosive paint for inner wall of water-based aerosol can and preparation method thereof

Technical Field

The invention belongs to the technical field of aerosol cans, and particularly relates to an environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can and a preparation method thereof.

Background

The aerosol is prepared by packaging medicine, emulsion or suspension and proper propellant together in an aerosol can, spraying the content in mist form by the pressure of the propellant when in use, and is applied to pharmacy (aerosol inhalation administration), cosmetics (more common such as water supplementing aerosol), daily chemicals (spray paint), building materials (foaming glue), industrial products (cleaning agent, release agent), foods (aerosol edible oil, cream aerosol), automobiles (vehicle interior cleaning agent) and the like, and is widely used in the industries of sanitation, household, medicine, spray paint and the like.

Because the current social development subject is mainly green and environment-friendly, the water aerosol is applied continuously and widely.

The main performance requirements of aerosol cans for sealing aerosol are pressure resistance, sealing performance, corrosion resistance and surface quality, and the aerosol cans have various sizes and shapes and are sealed with various aerosols.

The inner wall of the aerosol can directly contacts with the aerosol, so the inner wall of the aerosol can has higher corrosion resistance requirement and can not have penetrating pollution to the aerosol.

Based on the above, an environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can and a preparation method thereof are provided to solve the prior technical problems.

Disclosure of Invention

The invention aims to provide an environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can and a preparation method thereof, so as to solve the defects in the prior art.

The technical scheme adopted by the invention is as follows:

An environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can, wherein the environment-friendly anticorrosive paint contains quantum dots and bismuth oxide;

the mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 7-8%;

The mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.2-0.4%;

The environment-friendly anticorrosive paint also comprises epoxy resin, a diluent, a toughening agent, sucrose stearate, a defoaming agent, a coupling agent, a leveling agent and a curing agent.

As a further technical scheme, the preparation method of the quantum dot comprises the following steps:

(1) Calcining the nano bentonite for 1 hour under the protection of inert atmosphere, and then cooling to room temperature to obtain calcined nano bentonite;

(2) Adding asphalt powder into a reaction kettle, then adding concentrated nitric acid, carrying out electromagnetic stirring treatment, firstly stirring and reacting for 40min at 60 ℃, then adjusting the temperature to 80 ℃, continuously stirring and reacting for 15min, finally adjusting the temperature to 100 ℃, and adding the calcined nano bentonite prepared in the step (1), continuously stirring and reacting for 5 h, and ending the reaction;

(3) After the reaction is finished, cooling to room temperature, adding 10% deionized water into a reaction system, stirring for 30min, removing residual nitric acid through reduced pressure distillation, and drying in vacuum to obtain the quantum dots.

As a further technical scheme, the inert atmosphere in the step (1) is nitrogen or neon;

the calcination treatment temperature is 600-620 ℃.

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

the mass fraction of the concentrated nitric acid is 60%.

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

As a further technical scheme, the vacuum drying temperature in the step (3) is 50 ℃ and the time is 65min.

As a further technical scheme, the environment-friendly anticorrosive paint also comprises the following components, by weight, 42-45 parts of epoxy resin, 6-8 parts of diluent, 0.3-0.6 part of sucrose stearate, 1-1.2 parts of defoamer, 1-1.5 parts of coupling agent, 0.2-0.3 part of flatting agent and 20-24 parts of curing agent;

The epoxy resin is phenolic epoxy resin.

As a further technical scheme, the diluent is ethylene glycol diglycidyl ether;

the defoaming agent is an organosilicon defoaming agent.

As a further technical scheme, the coupling agent is bis (gamma-triethoxysilylpropyl) tetrasulfide;

the leveling agent is acrylic ester leveling agent;

The curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

The mixing mass ratio of the tetraethylenepentamine to the diethylenetriamine is 5:1.

The preparation method of the environment-friendly anticorrosive paint for the inner wall of the water aqua aerosol can comprises the following steps:

s1, weighing the components according to the proportion of the dosage of each component;

s2, firstly, mixing epoxy resin, a diluent, sucrose stearate and a defoaming agent together, and shearing and dispersing for 30min to obtain a dispersion liquid;

s3, adding quantum dots, bismuth oxide, a coupling agent, a leveling agent and a curing agent into the dispersion liquid obtained in the step S2 in sequence, and stirring for 1 hour to obtain a mixed liquid;

Stirring rotation speed is 3000r/min;

and S4, finally adding a curing agent into the mixed solution obtained in the step S3, and continuously stirring and uniformly mixing to obtain the modified polyurethane foam.

The beneficial effects are that:

The environment-friendly anticorrosive paint prepared by the invention is mainly used for spraying the inner wall of the aqueous aerosol can to form a stable corrosion-resistant coating, so that the corrosion effect of the aqueous aerosol medium on the aerosol can body can be effectively avoided.

After the environment-friendly anticorrosive paint is sprayed on the inner wall of the aqueous aerosol can, a coating with high hardness and corrosion resistance can be formed, and the surface of the aerosol can body can be protected from being corroded by a medium.

According to the invention, the special quantum dots are introduced and uniformly dispersed in a coating system and are combined with an epoxy resin molecular chain, so that the coating structure can be stabilized, the hardness and toughness are obviously improved, the corrosion resistance effect of the surface of the coating can be improved due to the substantial improvement of the stability, and the stable combination structure between the coating and the inner wall of the tank body can be promoted in the presence of the quantum dots and bismuth oxide, mainly the chemical bond is mainly formed, and the coating can react with the inner wall metal surface of the aerosol tank body to form the stable chemical bond, so that the coating is firmly adsorbed on the inner wall metal surface, the combination degree of the coating and the inner wall metal is greatly improved, and the corrosion resistance of the inner wall of the aerosol tank is improved.

According to the invention, the acrylate leveling agent is introduced, so that the main effect is to reduce the tension of the surface of the paint, when leveling agent molecules are dissolved on the surface, the polar ends of the leveling agent molecules are adsorbed on the surface, and the nonpolar ends face the air, so that the intermolecular distance on the liquid level is increased, the liquid level tension is reduced, the leveling agent molecules flow more easily and are spread on the inner wall surface of the aerosol can, and a flat and smooth coating is formed on the inner wall surface of the aerosol can.

According to the invention, the components of the coating are optimized, so that the solvent is avoided, the formed coating structure is more stable and compact, the components cannot permeate into the medium in the gasification tank, and the problem of medium pollution in the aerosol tank is solved, therefore, the environment-friendly coating prepared by the method is used on the inner wall of the aerosol tank, and is safer and more reliable.

Detailed Description

The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following are specific examples:

Example 1

The mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 7%;

the mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.2%;

the preparation method of the quantum dot comprises the following steps:

(1) Calcining nanometer bentonite under the protection of nitrogen for 1 hour, and cooling to room temperature to obtain calcined nanometer bentonite, wherein the calcining temperature is 600 ℃;

(2) Adding asphalt powder into a reaction kettle, then adding concentrated nitric acid, carrying out electromagnetic stirring treatment, firstly stirring and reacting for 40min at 60 ℃, then adjusting the temperature to 80 ℃, continuously stirring and reacting for 15min, finally adjusting the temperature to 100 ℃, and adding the calcined nano bentonite prepared in the step (1), continuously stirring and reacting for 5h, and ending the reaction, wherein the mixing ratio of the asphalt powder and the concentrated nitric acid is 10g:200mL;

the mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder to the calcined nano bentonite is 20:1.

(3) After the reaction is finished, cooling to room temperature, adding 10% deionized water into a reaction system, stirring for 30min, removing residual nitric acid by reduced pressure distillation, and vacuum drying to obtain the quantum dots, wherein the vacuum drying temperature is 50 ℃ and the time is 65min.

The environment-friendly anticorrosive paint also comprises the following components, by weight, 42 parts of phenolic epoxy resin, 6 parts of ethylene glycol diglycidyl ether, 0.3 part of sucrose stearate, 1 part of an organosilicon defoamer, 1 part of bis (gamma-triethoxysilylpropyl) tetrasulfide, 0.2 part of an acrylic ester flatting agent and 20 parts of a curing agent, wherein the curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

Example 2

The mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 7.2%;

the mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.25%;

the preparation method of the quantum dot comprises the following steps:

(1) Calcining nanometer bentonite under the protection of nitrogen for 1 hour, and cooling to room temperature to obtain calcined nanometer bentonite, wherein the calcining temperature is 605 ℃;

(2) Adding asphalt powder into a reaction kettle, then adding concentrated nitric acid, carrying out electromagnetic stirring treatment, firstly stirring and reacting for 40min at 60 ℃, then adjusting the temperature to 80 ℃, continuously stirring and reacting for 15min, finally adjusting the temperature to 100 ℃, and adding the calcined nano bentonite prepared in the step (1), continuously stirring and reacting for 5h, and ending the reaction, wherein the mixing ratio of the asphalt powder and the concentrated nitric acid is 12g:200mL;

The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder to the calcined nano bentonite is 20:1.2.

The environment-friendly anticorrosive paint also comprises the following components, by weight, 44 parts of phenolic epoxy resin, 8 parts of ethylene glycol diglycidyl ether, 0.6 part of sucrose stearate, 1 part of an organosilicon defoamer, 1.2 parts of bis (gamma-triethoxysilylpropyl) tetrasulfide, 0.25 part of an acrylic ester flatting agent and 21 parts of a curing agent, wherein the curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

Example 3

the mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 7.3%;

the mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.3%;

the preparation method of the quantum dot comprises the following steps:

(1) Calcining nanometer bentonite under the protection of nitrogen for 1 hour, and cooling to room temperature to obtain calcined nanometer bentonite, wherein the calcining temperature is 615 ℃;

(2) Adding asphalt powder into a reaction kettle, then adding concentrated nitric acid, carrying out electromagnetic stirring treatment, firstly stirring and reacting for 40min at 60 ℃, then adjusting the temperature to 80 ℃, continuously stirring and reacting for 15min, finally adjusting the temperature to 100 ℃, and adding the calcined nano bentonite prepared in the step (1), continuously stirring and reacting for 5h, and ending the reaction, wherein the mixing ratio of the asphalt powder and the concentrated nitric acid is 13g:200mL;

The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder to the calcined nano bentonite is 20:1.4.

The environment-friendly anticorrosive paint also comprises the following components, by weight, 43 parts of phenolic epoxy resin, 6.5 parts of ethylene glycol diglycidyl ether, 0.4 part of sucrose stearate, 1.1 part of an organosilicon defoamer, 1.2 parts of bis (gamma-triethoxysilylpropyl) tetrasulfide, 0.25 part of an acrylic ester flatting agent and 22 parts of a curing agent, wherein the curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

Example 4

The mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 7.6%;

the mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.38%;

the preparation method of the quantum dot comprises the following steps:

(1) Calcining nanometer bentonite under the protection of nitrogen for 1 hour, and cooling to room temperature to obtain calcined nanometer bentonite, wherein the calcining temperature is 610 ℃;

The mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder to the calcined nano bentonite is 20:1.5.

The environment-friendly anticorrosive paint also comprises the following components, by weight, 44 parts of phenolic epoxy resin, 7 parts of ethylene glycol diglycidyl ether, 0.5 part of sucrose stearate, 1.1 part of an organosilicon defoamer, 1.4 parts of bis (gamma-triethoxysilylpropyl) tetrasulfide, 0.28 part of an acrylic ester flatting agent and 23 parts of a curing agent, wherein the curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

Example 5

The mass fraction of the quantum dots in the environment-friendly anticorrosive paint is 8%;

The mass fraction of bismuth oxide in the environment-friendly anticorrosive paint is 0.4%;

the preparation method of the quantum dot comprises the following steps:

(1) Calcining nanometer bentonite under the protection of nitrogen for 1 hour, and cooling to room temperature to obtain calcined nanometer bentonite, wherein the calcining temperature is 620 ℃;

(2) Adding asphalt powder into a reaction kettle, then adding concentrated nitric acid, carrying out electromagnetic stirring treatment, firstly stirring and reacting for 40min at 60 ℃, then adjusting the temperature to 80 ℃, continuously stirring and reacting for 15min, finally adjusting the temperature to 100 ℃, and adding the calcined nano bentonite prepared in the step (1), continuously stirring and reacting for 5h, and ending the reaction, wherein the mixing ratio of the asphalt powder and the concentrated nitric acid is 15g:200mL;

the mass fraction of the concentrated nitric acid is 60%. The mixing ratio of the asphalt powder to the calcined nano bentonite is 20:1.6.

The environment-friendly anticorrosive paint also comprises the following components, by weight, 45 parts of phenolic epoxy resin, 8 parts of ethylene glycol diglycidyl ether, 0.6 part of sucrose stearate, 1.2 parts of an organosilicon defoamer, 1.5 parts of bis (gamma-triethoxysilylpropyl) tetrasulfide, 0.3 part of an acrylic ester flatting agent and 24 parts of a curing agent, wherein the curing agent is formed by mixing tetraethylenepentamine and diethylenetriamine;

The preparation method of the above embodiment comprises the following steps:

Stirring rotation speed is 3000r/min;

Comparative example 1:

An environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can, wherein the environment-friendly anticorrosive paint contains bismuth oxide;

Comparative example 2:

An environment-friendly anticorrosive paint for the inner wall of an aqueous aerosol can, wherein the environment-friendly anticorrosive paint contains bentonite and bismuth oxide;

The mass fraction of bentonite in the environment-friendly anticorrosive paint is 7%;

the preparation method of the quantum dot comprises the following steps:

And (3) testing:

The examples and the comparative examples are respectively and evenly sprayed on the surface of the plate glass, and after curing for 4 hours at 50 ℃, the thickness difference of the coating films is not more than 1 micrometer;

the salt spray resistance test method adopts a programmable salt spray corrosion test box, and tests according to JH/T E06-2015 standard, and the specific results are shown in Table 1:

TABLE 1

	Salt mist/h resistance
		Example 1	402
Example 2	407
		Example 3	412
Example 4	416
		Example 5	421
Comparative example 1	365
		Comparative example 2	376

As can be seen from Table 1, the environment-friendly anticorrosive paint for the inner wall of the aqueous aerosol can prepared by the embodiment has higher corrosion resistance.

Based on the sample of the example 1, the influence of mass fractions of different quantum dots on the adhesive force is compared;

The adhesive force is measured by using a standard cell plate BGD503 according to the GB 1720-1989 standard:

TABLE 2

As can be seen from table 2, the coating adhesion increases and then decreases with increasing quantum dot content.

Film hardness test of the sample of the embodiment is carried out by using a standard BGD506 and referring to GB/T6739-2006 standard test;

TABLE 3 Table 3

	Hardness of coating film
		Example 1	2H
Example 2	2H
		Example 3	2H
Example 4	2H
		Example 5	2H

As can be seen from Table 3, the coating film formed by the coating material of the present invention has high hardness.

The foregoing description of the preferred embodiments of the invention should not be taken as limiting the scope of the invention, which is defined by the appended claims, but rather by the description of the preferred embodiments, all changes and modifications that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

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) 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 ending 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 an aqueous 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 an aqueous aerosol can according to claim 1, characterized in that the vacuum drying temperature in step (3) is 50°C and the time is 65 minutes.

4. The environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can according to claim 1, wherein the epoxy resin is a phenolic epoxy resin.

5. The environmentally friendly anti-corrosion coating for the inner wall of an aqueous aerosol can according to claim 1, wherein 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, wherein 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 it comprises the following steps:

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.