An aqueous epoxy zinc-rich coating for containers and its preparation method

Abstract

The present invention relates to the technical field of epoxy zinc-rich coatings, and specifically to an aqueous epoxy zinc-rich coating for containers and a preparation method thereof. The aqueous epoxy zinc-rich coating for containers consists of component A and component B. Component A includes 12-18 parts by weight of epoxy resin emulsion, 0.1-0.14 parts by weight of anti-flash rust agent, etc.; Component B includes 70-80 parts by weight of modified highly dispersible zinc powder, 0.1-1 part by weight of modified graphene, 2.6-3.2 parts by weight of polyamide curing agent, etc.; The epoxy resin modifier can form an interaction with the surface of zinc powder particles, thereby coating the epoxy resin molecular chain on the surface of zinc powder, which is beneficial to reducing the agglomeration of zinc powder particles and improving the dispersibility. Moreover, after coating the epoxy resin molecular chain on the surface, the compatibility between zinc powder and epoxy resin emulsion is better, thereby improving the storage stability of the epoxy zinc-rich coating and the mechanical properties and anti-corrosion and salt spray resistance of the paint film.

Description

Technical Field

[0001] The present invention relates to the technical field of epoxy zinc-rich coatings, and specifically to an aqueous epoxy zinc-rich coating for containers and a preparation method thereof. Background Art

[0002] Epoxy zinc-rich coatings are mainly composed of epoxy resin, zinc powder, anti-settling agent, curing agent, etc., and can play excellent anti-corrosion performance through shielding effect, electrochemical protection, passivation, etc. Usually, the zinc powder content in epoxy zinc-rich coatings is between 80-85%, but adding excessive zinc powder will cause problems such as easy sedimentation, poor storage stability, and reduced mechanical strength of the paint film. Adding graphene to epoxy zinc-rich coatings can further improve the anti-corrosion performance of the coatings.

[0003] Modifying the surface of zinc powder can improve its dispersion performance and the interfacial bonding performance between zinc powder and epoxy resin, which is beneficial to improving the storage stability and mechanical properties of the coatings. Patent CN105385305B discloses an aqueous epoxy zinc-rich coating containing microcapsule structure-modified zinc powder and its preparation. By adsorbing and coating zinc powder with hydrolyzable polyfunctional silane, a modified zinc powder with a tight microcapsule structure having a water-repellent effect is formed, which improves the dispersion of zinc powder in epoxy emulsion. The obtained aqueous epoxy zinc-rich coating has comprehensive properties such as good storage stability, low VOC content, and good adhesion to the substrate. However, this patent cannot improve the compatibility between zinc powder and epoxy resin, which is not conducive to improving the mechanical properties of the paint film of the coating. Summary of the Invention

[0004] The technical problem solved by the present invention is: to provide an aqueous epoxy zinc-rich coating for containers with good mechanical properties and excellent anti-corrosion performance.

[0005] The technical solution of the present invention is: an aqueous epoxy zinc-rich coating for containers, which is composed of component A and component B. Component A includes 12-18 parts by weight of epoxy resin emulsion, 0.1-0.14 parts by weight of anti-flash rust agent, and 0.1-0.15 parts by weight of defoamer; Component B includes 70-80 parts by weight of modified highly dispersible zinc powder, 0.1-1 part by weight of modified graphene, 2.6-3.2 parts by weight of polyamide curing agent, 10-15 parts by weight of propylene glycol methyl ether, 0.5-0.8 parts by weight of wetting agent, and 1.6-2.5 parts by weight of anti-settling agent.

[0006] The preparation method of the highly dispersible zinc powder includes:

[0007] (1) Glutamic acid and sodium carbonate are added to water. After stirring, sodium 2-bromoethanesulfonate is added. The molar ratio of glutamic acid, sodium hydroxide, and sodium 2-bromoethanesulfonate is 1:(1 - 1.1):(1 - 1.1). It is heated to 75 - 80 °C and reacted for 2 - 3 h. After cooling, saturated sodium chloride solution is added, and it is extracted with ethyl acetate. The organic phase is concentrated under reduced pressure. The product is added to water, heated and evaporated to concentrate, cooled and crystallized in an ice-water bath, and dried to obtain sodium 2-sulfoethyliminoglutarate. The reaction formula is:

[0008]

[0009] (2) Epoxy resin and sodium 2-sulfoethyliminoglutarate with a mass ratio of 100:(76 - 82) are added to ethylene glycol monobutyl ether and n-butanol. It is reacted at 80 - 90 °C for 3 - 5 h. After cooling, acetone is added, filtered, washed with acetone, and dried to obtain an epoxy resin modifier. The reaction formula is:

[0010]

[0011] (3) Zinc powder and epoxy resin modifier with a mass ratio of 100:(1 - 3) are added to water, and ball-milled in a high-speed ball mill for 1 - 2 h, filtered, and dried to obtain highly dispersed zinc powder.

[0012] Preferably, the preparation method of modified graphene includes: adding graphene oxide to thionyl chloride for reaction to obtain acyl chloride graphene; then adding acyl chloride graphene to dichloromethane, ultrasonically dispersing, adding triethylamine and sodium 2-sulfoethyliminoglutarate, reacting for 18 - 24 h, filtering, washing with water, and drying to obtain modified graphene.

[0013] Preferably, the mass ratio of acyl chloride graphene, triethylamine, and sodium 2-sulfoethyliminoglutarate is 100:(120 - 500):(300 - 1200).

[0014] Preferably, the preparation method of the container waterborne epoxy zinc-rich coating includes: adding an anti-flash rust agent and a defoaming agent to an epoxy resin emulsion, stirring and dispersing to obtain component A.

[0015] Adding modified highly dispersed zinc powder, modified graphene, polyamide curing agent, weight parts, wetting agent, and anti-settling agent to propylene glycol methyl ether, stirring and dispersing to obtain component B; adding component B to component A, stirring and mixing evenly to obtain the container waterborne epoxy zinc-rich coating.

[0016] The technical effects of the present invention are as follows: By reacting the imino group of sodium ethylsulfonate iminoglutaric acid with the epoxy group of epoxy resin, carboxyl and sodium sulfonate groups are introduced into the epoxy resin molecular chain. The obtained epoxy resin modifier can form an interaction with the surface of zinc powder particles, thereby coating the epoxy resin molecular chain on the surface of zinc powder, which is beneficial to reducing the agglomeration of zinc powder particles and improving the dispersibility. Moreover, after the surface is coated with the epoxy resin molecular chain, the compatibility between zinc powder and epoxy resin emulsion is better, thus improving the storage stability of epoxy zinc-rich coatings and the mechanical properties and anti-corrosion and salt spray resistance of the paint film.

[0017] The graphene of the present invention is grafted and modified with sodium ethylsulfonate iminoglutaric acid, and groups such as carboxyl and sodium sulfonate are introduced on the surface. Its dispersibility and compatibility in epoxy resin emulsion are also very good, which is beneficial to improving the mechanical properties of the paint film of the coating, making the paint film have higher impact resistance, anti-corrosion and salt spray resistance, etc. It has good practical applications in aspects such as containers, shipbuilding, and bridges. Specific embodiments

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than 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 making creative efforts shall fall within the protection scope of the present invention.

[0019] The graphene oxide of the present invention, model HL-GO, is from Shanghai Hanlang New Materials Technology Co., Ltd. The epoxy resin emulsion is from Guangzhou Situlong Chemical Industry Co., Ltd. The defoamer, DF 5800C, is from Nanjing Chuhai New Materials Technology Co., Ltd. The anti-flash rust agent, Defros-T750, is from Shenzhen Longdi Chemical Industry Co., Ltd. The wetting agent, BYK9565, is from Shenzhen Longdi Chemical Industry Co., Ltd. The anti-settling agent, byk410, is from Shenzhen Longdi Chemical Industry Co., Ltd.

[0020] Example 1

[0021] (1) Add 5 mmol of glutamic acid and 5 mmol of sodium carbonate to 8 mL of water, stir, then add 5 mmol of 2-bromoethanesulfonic acid sodium, heat to 80 °C and react for 3 h. After cooling, add saturated sodium chloride solution, extract with ethyl acetate, concentrate the organic phase under reduced pressure, add the product to water, heat to evaporate and concentrate, cool and crystallize in an ice-water bath, and dry to obtain sodium ethylsulfonate iminoglutaric acid.

[0022] (2) Add 6 mL of n-butanol, 2 g of epoxy resin E44, and 1.52 g of sodium iminoglutarate ethylsulfonate to 10 mL of ethylene glycol monobutyl ether, react at 80 °C for 4 h, add acetone after cooling, filter, wash with acetone, and dry to obtain an epoxy resin modifier.

[0023] (3) Add 100 g of zinc powder (average particle size 1200 mesh) and 1 g of epoxy resin modifier to 100 mL of water, ball mill in a high-speed ball mill for 1 h, filter, and dry to obtain highly dispersed zinc powder.

[0024] (4) Add 0.5 g of graphene oxide to 40 mL of thionyl chloride, react at 70 °C for 18 h in a nitrogen atmosphere, filter, wash with dichloromethane, and dry to obtain acyl chloride graphene; then add 0.5 g of acyl chloride graphene to 150 mL of dichloromethane, ultrasonically disperse, add 1.5 g of triethylamine and 3.8 g of sodium iminoglutarate ethylsulfonate, react for 24 h, filter, wash with water, and dry to obtain modified graphene.

[0025] (5) Add 1.3 g of anti-flash rust agent and 1.5 g of defoamer to 160 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add 700 g of modified highly dispersed zinc powder, 1 g of modified graphene, 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent to 100 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0026] Example 2

[0027] (1) Add 5 mmol of glutamic acid and 5.5 mmol of sodium carbonate to 10 mL of water, stir, add 5.5 mmol of 2-bromoethanesulfonic acid sodium salt, heat to 75 °C and react for 2 h, add saturated sodium chloride solution after cooling, extract with ethyl acetate, concentrate the organic phase under reduced pressure, add the product to water, heat and evaporate to concentrate, cool and crystallize in an ice-water bath, and dry to obtain sodium iminoglutarate ethylsulfonate.

[0028] (2) Add 8 mL of n-butanol, 2 g of epoxy resin E44, and 1.64 g of sodium iminoglutarate ethylsulfonate to 10 mL of ethylene glycol monobutyl ether, react at 90 °C for 3 h, add acetone after cooling, filter, wash with acetone, and dry to obtain an epoxy resin modifier.

[0029] (3) Add 100 g of zinc powder (average particle size 1200 mesh) and 3 g of epoxy resin modifier to 150 mL of water, ball mill in a high-speed ball mill for 2 h, filter, and dry to obtain highly dispersed zinc powder.

[0030] (4) Add 0.5 g of graphene oxide to 50 mL of thionyl chloride, react at 60 °C for 24 h in a nitrogen atmosphere, filter, wash with dichloromethane, and dry to obtain acyl chloride graphene; then add 0.5 g of acyl chloride graphene to 200 mL of dichloromethane, ultrasonically disperse, add 2.5 g of triethylamine and 6 g of sodium ethylsulfonate iminoglutarate, react for 24 h, filter, wash with water, and dry to obtain modified graphene.

[0031] (5) Add 1.4 g of anti-flash rust agent and 1 g of defoamer to 120 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add modified 750 g of highly dispersed zinc powder, 5 g of modified graphene, 26 g of polyamide 650 curing agent, 5 g of wetting agent, and 25 g of anti-settling agent to 150 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0032] Example 3

[0033] (1) Add 6 mL of n-butanol, 2 g of epoxy resin E44, and 1.57 g of sodium ethylsulfonate iminoglutarate (prepared in the same way as in Example 1) to 10 mL of ethylene glycol monobutyl ether, react at 80 °C for 5 h, cool, add acetone, filter, wash with acetone, and dry to obtain an epoxy resin modifier.

[0034] (2) Add 100 g of zinc powder (average particle size 1200 mesh) and 2 g of epoxy resin modifier to 150 mL of water, ball mill in a high-speed ball mill for 2 h, filter, and dry to obtain highly dispersed zinc powder.

[0035] (3) Add 0.5 g of graphene oxide to 40 mL of thionyl chloride, react at 60 °C for 24 h in a nitrogen atmosphere, filter, wash with dichloromethane, and dry to obtain acyl chloride graphene; then add 0.5 g of acyl chloride graphene to 150 mL of dichloromethane, ultrasonically disperse, add 0.6 g of triethylamine and 1.5 g of sodium ethylsulfonate iminoglutarate, react for 18 h, filter, wash with water, and dry to obtain modified graphene.

[0036] (4) Add 1 g of anti-flash rust agent and 1.5 g of defoamer to 180 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add modified 800 g of highly dispersed zinc powder, 10 g of modified graphene, 32 g of polyamide 650 curing agent, 6 g of wetting agent, and 25 g of anti-settling agent to 150 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0037] Comparative Example 1

[0038] (1) 1.3 g of anti-flash rust agent and 1.5 g of defoamer were added to 160 g of epoxy resin emulsion and stirred for dispersion to obtain Component A. 700 g of modified highly dispersible zinc powder, 1 g of graphene oxide, 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent were added to 100 g of propylene glycol methyl ether and stirred for dispersion to obtain Component B; Component B was added to Component A and stirred evenly to obtain a container waterborne epoxy zinc-rich coating.

[0039] Comparative Example 2

[0040] (1) 1.3 g of anti-flash rust agent and 1.5 g of defoamer were added to 160 g of epoxy resin emulsion and stirred for dispersion to obtain Component A. 700 g of modified zinc powder (average particle size of 1200 mesh), 1 g of modified graphene (prepared in the same way as in Example 1), 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent were added to 100 g of propylene glycol methyl ether and stirred for dispersion to obtain Component B; Component B was added to Component A and stirred evenly to obtain a container waterborne epoxy zinc-rich coating.

[0041] Comparative Example 3

[0042] (1) 100 g of zinc powder (average particle size of 1200 mesh) and 1 g of epoxy resin E44 were added to 100 mL of water and ball-milled in a high-speed ball mill for 1 h, filtered, and dried to obtain highly dispersible zinc powder.

[0043] (2) 1.3 g of anti-flash rust agent and 1.5 g of defoamer were added to 160 g of epoxy resin emulsion and stirred for dispersion to obtain Component A. 700 g of modified highly dispersible zinc powder, 1 g of modified graphene (prepared in the same way as in Example 1), 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent were added to 100 g of propylene glycol methyl ether and stirred for dispersion to obtain Component B; Component B was added to Component A and stirred evenly to obtain a container waterborne epoxy zinc-rich coating.

[0044] Comparative Example 4

[0045] (1) 100 g of zinc powder (average particle size of 1200 mesh) and 1 g of sodium ethylsulfonate iminoglutarate (prepared in the same way as in Example 1) were added to 100 mL of water and ball-milled in a high-speed ball mill for 1 h, filtered, and dried to obtain highly dispersible zinc powder.

[0046] (2) Add 1.3 g of anti-flash rust agent and 1.5 g of defoamer to 160 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add 700 g of modified highly dispersible zinc powder, 1 g of modified graphene (prepared in the same way as in Example 1), 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent to 100 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0047] Comparative Example 5

[0048] (1) Add 100 g of zinc powder (average particle size 1200 mesh) and 1 g of stearic acid to 100 mL of water, ball mill in a high-speed ball mill for 1 h, filter, and dry to obtain highly dispersible zinc powder.

[0049] (2) Add 1.3 g of anti-flash rust agent and 1.5 g of defoamer to 160 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add 700 g of modified highly dispersible zinc powder, 1 g of modified graphene (prepared in the same way as in Example 1), 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent to 100 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0050] Comparative Example 6

[0051] (1) Add 100 g of zinc powder (average particle size 1200 mesh) and 1 g of sodium dodecylbenzenesulfonate to 100 mL of water, ball mill in a high-speed ball mill for 1 h, filter, and dry to obtain highly dispersible zinc powder.

[0052] (2) Add 1.3 g of anti-flash rust agent and 1.5 g of defoamer to 160 g of epoxy resin emulsion, stir and disperse to obtain Component A. Add 700 g of modified highly dispersible zinc powder, 1 g of modified graphene (prepared in the same way as in Example 1), 30 g of polyamide 650 curing agent, 8 g of wetting agent, and 16 g of anti-settling agent to 100 g of propylene glycol methyl ether, stir and disperse to obtain Component B; add Component B to Component A, stir and mix evenly to obtain a container waterborne epoxy zinc-rich coating.

[0053] Test the storage stability of the coating according to the method of GB / T 6753.3 - 1986. The storage temperature is 25 °C and the time is 7 - 21 days. The polyamide 650 curing agent is not added to the coating during the test.

[0054] Spray the coating on the surface of the substrate and cure at 120 °C for 4 h to form a paint film coating.

[0055] The impact resistance was tested according to the method of GB / T 1732-2020. The salt spray resistance was tested according to the method of GB / T 1771-2007. The cross-cut test and adhesion grade test were carried out according to the method of GB / T 9286-2021.

[0056] Table 1: Storage stability test

[0057]

[0058]

[0059] Table 2: Adhesion, impact resistance, and salt spray resistance tests

[0060] Adhesion grade Impact resistance (cm) Salt spray resistance (h) Example 1 0 50 528 Example 2 0 60 672 Example 3 1 55 624 Comparative example 1 0 40 480 Comparative example 2 6 30 336 Comparative example 3 6 30 336 Comparative example 4 2 45 432 Comparative example 5 3 45 384 Comparative example 6 2 45 408

[0061] As can be seen from Table 1 and Table 2, after the epoxy zinc-rich coatings of Examples 1-3 were stored for 7-21 days, there was no sediment at the bottom, and they had good storage stability. This is because the epoxy resin modifier contains more carboxyl and sodium sulfonate groups, which can form interactions with the surface of zinc powder particles, thereby coating the epoxy resin molecular chains on the surface of zinc powder, facilitating the reduction of zinc powder particle agglomeration, improving the dispersibility, and after coating the epoxy resin molecular chains on the surface, the compatibility between zinc powder and the epoxy resin emulsion is better, thus improving the storage stability of the epoxy zinc-rich coating and the mechanical properties and anti-corrosion and salt spray resistance of the paint film. And graphene was grafted and modified with sodium ethylsulfonate iminoglutaric acid, introducing groups such as carboxyl and sodium sulfonate on the surface, and it also had good dispersibility and compatibility in the epoxy resin emulsion, which was beneficial to improving the mechanical properties of the paint film of the coating, making the paint film have higher impact resistance, anti-corrosion and salt spray resistance, etc.

[0062] Compared with Example 1, the graphene oxide in Comparative Example 1 was not grafted and modified with sodium ethylsulfonate iminoglutaric acid, and the graphene oxide was prone to agglomeration, and its compatibility and dispersibility with the epoxy resin emulsion were poor, resulting in slightly lower impact resistance, anti-corrosion and salt spray resistance, etc. of the paint film than those of Example 1, and after long-term storage, there were trace amounts of graphene oxide sediment at the bottom of the coating.

[0063] In Comparative Example 2, the zinc powder was not surface-modified, was very easy to agglomerate, had very poor dispersibility, the storage stability of the coating was not good, and the impact resistance, anti-corrosion and salt spray resistance, etc. of the paint film of the coating were poor.

[0064] In Comparative Example 3, epoxy resin E44 did not contain carboxyl and sodium sulfonate groups and could not modify the surface of zinc powder particles. The zinc powder was very easy to agglomerate, had very poor dispersibility, the storage stability of the coating was not good, and the impact resistance, anti-corrosion and salt spray resistance, etc. of the paint film of the coating were poor.

[0065] Compared with Example 1, Comparative Examples 4, 5, and 6 respectively use sodium ethanesulfonate iminoglutaric acid, stearic acid, and sodium ethanesulfonate iminoglutaric acid to modify the zinc powder. The agglomeration problem and dispersibility of the zinc powder are improved to a certain extent, and the storage stability of the coating is improved. However, the compatibility between sodium ethanesulfonate iminoglutaric acid, stearic acid, and sodium ethanesulfonate iminoglutaric acid and the epoxy resin emulsion is poor, and there is no good compatibility between the modified zinc powder and the epoxy resin emulsion. After long-term storage, sediment is generated, the storage stability is poor, and the impact resistance, corrosion resistance, and salt spray resistance of the paint film are lower than those of Example 1.

[0066] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An aqueous epoxy zinc-rich coating for containers, characterized in that, The waterborne epoxy zinc-rich coating for containers consists of component A and component B. Component A includes 12 - 18 parts by weight of epoxy resin emulsion, 0.1 - 0.14 parts by weight of anti-flash rust agent, and 0.1 - 0.15 parts by weight of defoamer; Component B includes 70 - 80 parts by weight of modified highly dispersed zinc powder, 0.1 - 1 part by weight of modified graphene, 2.6 - 3.2 parts by weight of polyamide curing agent, 10 - 15 parts by weight of propylene glycol methyl ether, 0.5 - 0.8 part by weight of wetting agent, and 1.6 - 2.5 parts by weight of anti-settling agent; The preparation method of the highly dispersed zinc powder includes: (1) Add epoxy resin and sodium ethylsulfonate iminoglutarate to ethylene glycol monobutyl ether and n-butanol. After reaction, cool and add acetone, filter, wash with acetone, and dry to obtain an epoxy resin modifier; (2) Add zinc powder and the epoxy resin modifier to water, and ball mill in a high-speed ball mill, filter, and dry to obtain highly dispersed zinc powder; The preparation method of the modified graphene includes: React graphene oxide with thionyl chloride to obtain acyl chloride graphene; then add the acyl chloride graphene to dichloromethane, ultrasonically disperse, add triethylamine and sodium ethylsulfonate iminoglutarate, react for 18 - 24 h, filter, wash with water, and dry to obtain modified graphene; Among them, the structural formula of sodium ethylsulfonate iminoglutarate is: 。 2. The waterborne epoxy zinc-rich coating for containers according to claim 1, wherein The preparation method of sodium ethylsulfonate iminoglutarate includes: Add glutamic acid and sodium carbonate to water, stir and then add 2-bromoethanesulfonic acid sodium, heat to 75 - 80 °C and react for 2 - 3 h, cool and add saturated sodium chloride solution, extract with ethyl acetate, concentrate the organic phase under reduced pressure, add the product to water, heat and evaporate to concentrate, cool and crystallize in an ice-water bath, and dry to obtain sodium ethylsulfonate iminoglutarate.

3. The waterborne epoxy zinc-rich coating for containers according to claim 1, characterized in that, The reaction in (1) is carried out at 80 - 90 °C for 3 - 5 h.

4. The waterborne epoxy zinc-rich coating for containers according to claim 1, wherein In (1), the mass ratio of epoxy resin to sodium ethylsulfonate iminoglutarate is 100:(76 - 82).

5. The waterborne epoxy zinc-rich coating for containers according to claim 1, wherein In (2), the mass ratio of zinc powder to the epoxy resin modifier is 100:(1 - 3); the ball milling time is 1 - 2 h.

6. The waterborne epoxy zinc-rich coating for containers according to claim 1, wherein, The mass ratio of acyl chloride graphene, triethylamine, and sodium ethylsulfonate iminoglutarate is 100:(120 - 500):(300 - 1200).

7. The waterborne epoxy zinc-rich coating for containers according to claim 2, wherein The molar ratio of glutamic acid, sodium carbonate, and 2-bromoethanesulfonic acid sodium is 1:(1 - 1.1):(1 - 1.1).

8. A preparation method of the container waterborne epoxy zinc-rich coating according to any one of claims 1-7, characterized in that, The preparation method includes: Add the anti-flash rust agent and defoamer to the epoxy resin emulsion, stir and disperse to obtain component A; Add the modified highly dispersed zinc powder, modified graphene, polyamide curing agent, wetting agent, and anti-settling agent to propylene glycol methyl ether, stir and disperse to obtain component B; Add component B to component A, stir and mix evenly to obtain the waterborne epoxy zinc-rich coating for containers.

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