An antibacterial and cleaning epoxy drinking water tank paint and its preparation method

Abstract

This invention discloses an antibacterial and cleaning epoxy drinking water tank paint and its preparation method. The antibacterial and cleaning epoxy drinking water tank paint of this invention comprises the following raw materials in parts by weight: 25-35 parts solvent, 50-60 parts epoxy resin, 1-1.5 parts filler, 0.5-1 part emulsifier, 20-30 parts curing agent, 5-10 parts coloring pigment, 3-5 parts functional additives, 3-5 parts plasticizer, and 0.5-1 part defoamer. Compared with the prior art, the antibacterial and cleaning epoxy drinking water tank paint prepared by this invention has antibacterial activity. This antibacterial property can provide additional protection on the inner surface of the drinking water tank, inhibiting the growth of bacteria and other microorganisms, reducing the risk of pollution and transmission. It also has good cleaning properties, forming a smooth, easy-to-clean surface, helping to reduce the adhesion of dirt and contaminants, and facilitating the cleaning and maintenance of the water tank's hygiene.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to an antibacterial and cleaning epoxy drinking water tank paint and its preparation method. Background Technology

[0002] Marine biofouling is a complex problem that not only causes significant economic losses and safety issues but also negatively impacts marine ecosystems. Marine biofouling refers to the undesirable adhesion of biological and non-biological dissolved compounds, microorganisms, plants, and animals to ship hulls and equipment immersed in seawater. This often accelerates surface corrosion, causes structural and functional defects, increases navigation resistance, leads to increased fuel consumption, and raises maintenance costs. Therefore, advancements in antifouling technology are crucial for economic development, marine resource exploitation and utilization, and environmental protection. Antifouling coatings, due to their ease of use, low cost, and high efficiency, are widely used in ship antifouling. Various natural antifouling surfaces have been discovered in animals and plants. Based on biomimicry, researchers have designed various antifouling coatings, such as antifouling agent release coatings, dynamic surface antifouling coatings, and fouling-resistant coatings, which prevent the adhesion and colonization of marine fouling organisms to surfaces through physical or chemical methods, or facilitate their separation from surfaces, thus achieving antifouling. Therefore, developing more efficient, durable, and environmentally safer antifouling coatings is essential.

[0003] Chinese invention patent application CN114133829A discloses an antibacterial and waterproof epoxy floor coating and its preparation method. The floor coating is composed of component A and component B, mixed in a mass ratio of 1 to 1.5:3. The raw materials of component A are as follows, by weight: 50 to 60 parts epoxy resin, 20 to 25 parts modified epoxy resin, 0.2 to 0.4 parts antistatic agent, 1 to 1.5 parts filler, and 0.5 to 1 part emulsifier. The raw materials of component B are as follows, by weight: 40 to 50 parts epoxy curing agent, 1 to 3 parts curing accelerator, 0.2 to 0.3 parts thickener, and 0.5 to 1 part defoamer. This application incorporates itaconic acid, which possesses good adhesion and deodorizing properties. Due to its two active carboxyl groups and double bonds, it exhibits high chemical activity. Therefore, this application uses bisphenol A type epoxy resin diglycidyl ether to react with it, generating a bio-based epoxy resin. The resulting coating, after curing, exhibits better performance than traditional epoxy resin coatings. However, the epoxy floor paint prepared by this invention has poor antifouling and antibacterial properties. Summary of the Invention

[0004] In view of the shortcomings of poor antifouling and antibacterial properties of epoxy paints in the prior art, the technical problem to be solved by the present invention is to provide an antibacterial and cleaning epoxy drinking water tank paint with better antifouling and antibacterial properties and its preparation method.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] An antibacterial and cleaning epoxy drinking water tank paint comprises the following raw materials in parts by weight: 25-35 parts solvent, 50-60 parts epoxy resin, 1-1.5 parts filler, 0.5-1 part emulsifier, 20-30 parts curing agent, 5-10 parts coloring pigment, 3-5 parts functional additives, 3-5 parts plasticizer, and 0.5-1 part defoamer.

[0007] The solvent is at least one of xylene, toluene, butanol, ethanol, isopropanol, cyclohexanone, acetone, methyl isobutyl ketone, ethylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol methyl ether.

[0008] The filler is at least one of ceramic powder, nano silica, titanium dioxide, talc powder, mica powder, and bentonite.

[0009] The emulsifier is at least one of OP-10 emulsifier, pure acrylic emulsion, vinyl acetate acrylic emulsion, or styrene acrylic emulsion.

[0010] The curing agent is at least one of phenolic resin, polysaccharide anhydride, polyazelite anhydride, and polyisocyanate.

[0011] The coloring pigment is at least one of iron oxide red, carbon black, and lemon chrome yellow.

[0012] The plasticizer is at least one of dibutyl phthalate, dioctyl phthalate, diethyl phthalate, and benzyl alcohol.

[0013] The defoamer is polydimethylsiloxane.

[0014] The epoxy resin is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin, and glycidylamine type epoxy resin.

[0015] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is as follows:

[0016] Weigh each raw material according to the specified weight, mix the filler, emulsifier, coloring pigment, defoamer, and solvent, add them to the epoxy resin, heat to 80-90℃, and stir at 100-300 rpm for 4-6 hours; then cool to 50-70℃, add the curing agent and plasticizer, and stir at 100-300 rpm for 5-8 hours; cool to 40-50℃, add the functional additives, and stir at 100-300 rpm for 1-3 hours, then cool to room temperature to obtain the antibacterial and cleaning epoxy drinking water tank paint.

[0017] The preparation method of the functional additive is as follows, in parts by weight:

[0018] S1. Dissolve 0.5–2 parts sodium hexafluorophosphate and 0.5–2 parts p-fluorobenzylamine in 15–25 parts 2–6 mol / L hydrochloric acid until completely dissolved. Then add 1–3 parts titanium aluminum carbide powder. Stir at 60–70°C and 200–800 rpm for 50–120 h, centrifuge at 8000–12000 rpm for 3–8 min, wash with water until the pH of the washing solution is not less than 5.5–6.5, and freeze-dry under vacuum for 1–3 days to obtain the pretreated product.

[0019] S2. Add 0.1–0.3 parts of the pretreated material prepared in step S1 to 40–60 parts of water, sonicate for 5–15 min at a power of 200–500 W and a frequency of 30–60 kHz, then add 0.04–0.08 parts of tris(hydroxymethyl)aminomethane, adjust the pH to 8–9 with 0.5–2 mol / L sodium hydroxide aqueous solution, add 0.01–0.02 parts of 3,4-methylenedioxyphenylethylamine, and stir overnight at 100–300 rpm at room temperature to obtain the complex.

[0020] S3. Add 0.1 to 0.2 parts of the complex prepared in step S2 to 40 to 60 parts of Tris buffer, then add 0.04 to 0.06 parts of myristyl benzyl dimethyl saccharin ammonium, stir at 100 to 300 rpm at room temperature for 10 to 30 hours, and then vacuum dry to obtain the functional additive.

[0021] Sodium hexafluorophosphate and p-fluorobenzylamine in hydrochloric acid promote the conversion of titanium aluminum carbide powder into nanosheet structures. The successful grafting of myristylbenzyl dimethyl saccharin ammonium onto the nanosheet structures is attributed to the amino group of 3,4-methylenedioxyphenethylamine. Furthermore, the functional additives prepared in this invention exhibit a relatively neutral potential. Electroneutral surfaces are beneficial for maximizing surface hydration and improving antifouling capabilities.

[0022] 3,4-Methylenedioxyphenethylamine has relatively low electrical conductivity, resulting in a smoother surface for the functional additive and improved antifouling properties. Furthermore, grafting 3,4-methylenedioxyphenethylamine allows for the further binding of myristylbenzyldimethylsaccharin ammonium. Modification with myristylbenzyldimethylsaccharin ammonium significantly reduces the hydrostatic contact angle and improves hydrophilicity. The modified nanosheets have larger gaps and fewer layers, making them easier to coat, which is beneficial for antibacterial activity. The nanosheet structure can disrupt cell membranes upon direct contact with bacteria, leading to cell damage and death. On one hand, the nanosheet structure exhibits excellent antibacterial effects against *Escherichia coli* and *Staphylococcus aureus* due to its unique physicochemical properties. On the other hand, myristylbenzyldimethylsaccharin ammonium contains quaternary ammonium groups, which are generally considered to cause cell membrane disruption. Therefore, the quaternary ammonium salt groups in the functional additive have a synergistic effect on antibacterial properties, significantly enhancing performance. The enhanced antifouling performance is mainly due to the cell-disrupting effect of the nanosheet structure and the quaternary ammonium groups of myristylbenzyldimethyl saccharin ammonium, as well as the synergistic effect of the hydrogen bonding and solvation of the zwitterionic groups of myristylbenzyldimethyl saccharin ammonium to form an anti-protein adsorption hydration layer. The excellent antifouling performance originates from the dual effects of the nanosheet structure and myristylbenzyldimethyl saccharin ammonium. This invention prepares a zwitterionic polymerized functional additive through a chemical modification method. First, the pretreated nanosheets are modified by in-situ self-assembly of 3,4-methylenedioxyphenethylamine. Then, combined with myristylbenzyldimethyl saccharin ammonium, the functional additive prepared through the synergistic antifouling effect of the pretreated nanosheets and the zwitterionic polymer myristylbenzyldimethyl saccharin ammonium exhibits good antibacterial and anti-biofouling properties, resulting in a novel nanocomposite antifouling coating.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1) The functional additives added to the antibacterial and cleaning epoxy drinking water tank paint prepared in this invention possess antibacterial activity through pretreatment and complex formation. This antibacterial property can provide additional protection for the inner surface of the drinking water tank, inhibiting the growth of bacteria and other microorganisms, and reducing the risk of contamination and transmission.

[0025] 2) The antibacterial and cleaning epoxy drinking water tank paint prepared by this invention has excellent cleaning properties and can form a smooth, easy-to-clean surface. This helps reduce the adhesion of dirt and contaminants, making it convenient to clean and maintain the hygiene of the water tank.

[0026] 3) The antibacterial and cleaning epoxy drinking water tank paint prepared in this invention uses epoxy resin, which is a material with good chemical resistance and can resist the erosion of chemicals such as acids and alkalis. Furthermore, it has high hardness and wear resistance, resisting friction and abrasion. This allows the epoxy drinking water tank paint to maintain good appearance and performance during long-term use, extending its service life. Detailed Implementation

[0027] Main source of materials:

[0028] Bentonite: Zhejiang Kangbaixin New Materials Co., Ltd., Model: CP-100.

[0029] OP-10 emulsifier: Jinan Xinshuangyue Chemical Co., Ltd., Model: 99.

[0030] Bisphenol A type epoxy resin: Laizhou Baichen Insulation Materials Co., Ltd., Model: E-42.

[0031] Phenolic resin: Zhengzhou Hengtong Chemical Co., Ltd., Product No.: Phenolic resin FQ-9.

[0032] Polydimethylsiloxane: Jinan Xinglongda Chemical Co., Ltd., Product No.: 8556896.

[0033] Titanium aluminum carbide powder: Ningbo Jinlei Nanomaterials Technology Co., Ltd., item number: JL-Ti3AlC2, particle size: 400 mesh.

[0034] Example 1

[0035] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is as follows:

[0036] Mix 1.2g bentonite, 0.8g OP-10 emulsifier, 8g carbon black, 0.8g polydimethylsiloxane, and 30g xylene, then add them to 55g bisphenol A type epoxy resin. Heat to 85℃ and stir at 200rpm for 5 hours. Then cool to 60℃, add 25g phenolic resin and 4g dibutyl phthalate, and stir at 200rpm for 6 hours. Cool to 45℃, add 4g functional additives, stir at 200rpm for 2 hours, and then cool to room temperature to obtain antibacterial and cleaning epoxy drinking water tank paint.

[0037] The preparation method of the functional additive is as follows:

[0038] S1. Dissolve 1g sodium hexafluorophosphate and 1g p-fluorobenzylamine in 20g 5mol / L hydrochloric acid. Then add 2g titanium aluminum carbide powder. Stir at 65℃ and 500rpm for 100h. Centrifuge at 10000rpm for 5min. Wash with water until the pH of the washing solution is not less than 6. Freeze-dry under vacuum for 2d to obtain the pretreated product.

[0039] S2. Add 0.2g of the pretreated material prepared in step S1 to 50g of water, sonicate for 10min at a power of 300W and a frequency of 50kHz, then add 0.06g of tris(hydroxymethyl)aminomethane, adjust the pH to 8.5 with 1mol / L sodium hydroxide aqueous solution, add 0.015g of 3,4-methylenedioxyphenylethylamine, and stir overnight at 200rpm at room temperature to obtain the complex.

[0040] S3. Add 0.15g of the complex prepared in step S2 to 50g of Tris buffer, then add 0.05g of myristyl benzyl dimethyl saccharin ammonium, stir at 200rpm for 24h at room temperature, and then vacuum dry to obtain the functional additive.

[0041] Comparative Example 1

[0042] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is basically the same as that in Example 1, the only difference being that the preparation method of the functional additives is different.

[0043] The preparation method of the functional additive is as follows:

[0044] S1. Add 2g of titanium aluminum carbide powder to 20g of 5mol / L hydrochloric acid, stir at 65℃ and 500rpm for 100h, centrifuge at 10000rpm for 5min, rinse with water until the pH of the rinsing solution is not less than 6, freeze dry under vacuum for 2d to obtain the pretreated material.

[0045] S2. Add 0.2g of the pretreated material prepared in step S1 to 50g of water, sonicate for 10min at a power of 300W and a frequency of 50kHz, then add 0.06g of tris(hydroxymethyl)aminomethane, adjust the pH to 8.5 with 1mol / L sodium hydroxide aqueous solution, add 0.015g of 3,4-methylenedioxyphenylethylamine, and stir overnight at 200rpm at room temperature to obtain the complex.

[0046] S3. Add 0.15g of the complex prepared in step S2 to 50g of Tris buffer, then add 0.05g of myristyl benzyl dimethyl saccharin ammonium, stir at 200rpm for 24h at room temperature, and then vacuum dry to obtain the functional additive.

[0047] Comparative Example 2

[0048] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is basically the same as that in Example 1, the only difference being that the preparation method of the functional additives is different.

[0049] The preparation method of the functional additive is as follows:

[0050] S1. Dissolve 1g sodium hexafluorophosphate and 1g p-fluorobenzylamine in 20g 5mol / L hydrochloric acid. Then add 2g titanium aluminum carbide powder. Stir at 65℃ and 500rpm for 100h. Centrifuge at 10000rpm for 5min. Wash with water until the pH of the washing solution is not less than 6. Freeze-dry under vacuum for 2d to obtain the pretreated product.

[0051] S2. Add 0.2g of the pretreated material prepared in step S1 to 50g of water, sonicate for 10min at a power of 300W and a frequency of 50kHz, then add 0.06g of tris(hydroxymethyl)aminomethane, adjust the pH to 8.5 with 1mol / L sodium hydroxide aqueous solution, stir overnight at 200rpm at room temperature to obtain the complex.

[0052] S3. Add 0.15g of the complex prepared in step S2 to 50g of Tris buffer, then add 0.05g of myristyl benzyl dimethyl saccharin ammonium, stir at 200rpm for 24h at room temperature, and then vacuum dry to obtain the functional additive.

[0053] Comparative Example 3

[0054] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is basically the same as that in Example 1, the only difference being that the preparation method of the functional additives is different.

[0055] The preparation method of the functional additive is as follows:

[0056] S1. Dissolve 1g sodium hexafluorophosphate and 1g p-fluorobenzylamine in 20g 5mol / L hydrochloric acid. Then add 2g titanium aluminum carbide powder. Stir at 65℃ and 500rpm for 100h. Centrifuge at 10000rpm for 5min. Wash with water until the pH of the washing solution is not less than 6. Freeze-dry under vacuum for 2d to obtain the pretreated product.

[0057] S2. Add 0.2g of the pretreated material prepared in step S1 to 50g of water, sonicate for 10min at a power of 300W and a frequency of 50kHz, then add 0.06g of tris(hydroxymethyl)aminomethane, adjust the pH to 8.5 with 1mol / L sodium hydroxide aqueous solution, add 0.015g of 3,4-methylenedioxyphenylethylamine, and stir overnight at 200rpm at room temperature to obtain the complex.

[0058] S3. Add 0.15g of the complex prepared in step S2 to 50g of Tris buffer, stir at 200rpm for 24h at room temperature, and then vacuum dry to obtain the functional additive.

[0059] Comparative Example 4

[0060] The preparation method of an antibacterial and cleaning epoxy drinking water tank paint is as follows:

[0061] Mix 1.2g bentonite, 0.8g OP-10 emulsifier, 8g carbon black, 0.8g polydimethylsiloxane, and 30g xylene, add to 55g bisphenol A type epoxy resin, heat to 85℃, and stir at 200rpm for 5h; then cool to 60℃, add 25g phenolic resin and 4g dibutyl phthalate, and stir at 200rpm for 6h; cool to 45℃, stir at 200rpm for 2h, and then cool to room temperature to obtain antibacterial and cleaning epoxy drinking water tank paint.

[0062] Test Example 1

[0063] Stain resistance test

[0064] The experiment was designed according to the national standard GB / T 9780-2013 "Test Method for Stain Resistance of Architectural Coatings". The antibacterial and cleaning epoxy drinking water tank paint prepared according to this invention was applied to the test sample board according to the standard. The test method uses a suspension of ash and water at a mass ratio of 1:0.9 as the contaminant source, which was then applied to the test sample board. The sample was then left to dry naturally in the standard test environment for two hours. After drying, the sample board was rinsed with natural water flow according to the specified number of cycles. The test sample board was then left in the standard test environment until the next day, constituting one cycle. The above steps were repeated for five cycles. Finally, two tested coating sample boards and one untested coating sample board were compared with the color difference of the basic gray card for colorimetric evaluation. The test results are shown in Table 1.

[0065] Table 1. Results of stain resistance test

[0066] Experimental protocol Stain resistance rating / class Example 1 0 Comparative Example 1 2 Comparative Example 2 2 Comparative Example 3 1 Comparative Example 4 2

[0067] (The lower the grade, the stronger the stain resistance)

[0068] Test Example 2

[0069] Bacterial survival test

[0070] The number of Escherichia coli (strain number: ATCC8739, Latin name: Escherichia coli (Migula) Castellani et Chulmers) bacterial suspensions (1.0 mL) was determined and used as a control group. 0.2 mL of the antibacterial cleaning epoxy drinking water tank paint prepared according to this invention and 10 mL of Escherichia coli bacterial suspension were added to different conical flasks containing 50.0 mL of sterile water, respectively. The flasks were placed in a shaking incubator and then incubated at 37℃ for 24 h. The total number of viable bacteria was then measured, and the survival rate was calculated. The test results are shown in Table 2.

[0071] Table 2 Results of bacterial survival rate test

[0072] Test Plan Survival rate / % Example 1 11.3 Comparative Example 1 25.2 Comparative Example 2 23.7 Comparative Example 3 31.4 Comparative Example 4 42.5

[0073] As can be seen from the test data in Tables 1 and 2, the antibacterial and cleaning epoxy drinking water tank paint prepared in Example 1 of this invention exhibits excellent antifouling and antibacterial properties. The difference between Example 1 and Comparative Example 1 may be due to the fact that sodium hexafluorophosphate and p-fluorobenzylamine in hydrochloric acid promote the conversion of titanium aluminum carbide powder into nanosheet structures, and the successful grafting of myristylbenzyl dimethyl saccharin ammonium onto the nanosheet structures due to the amino group of 3,4-methylenedioxyphenethylamine. Furthermore, the functional additives prepared in this invention exhibit a relatively neutral potential. An electrically neutral surface is beneficial for maximizing surface hydration and improving antifouling ability.

[0074] Compared to Comparative Examples 2 and 3, the difference in Example 1 of this invention may be due to the lower conductivity of 3,4-methylenedioxyphenethylamine, resulting in a smoother surface for the functional additive and improved antifouling performance. Furthermore, grafting 3,4-methylenedioxyphenethylamine allows for further binding with myristylbenzyldimethylsaccharin ammonium. Modification with myristylbenzyldimethylsaccharin ammonium significantly reduces the hydrostatic contact angle and improves hydrophilicity. The modified nanosheets have larger gaps and fewer layers, making them easier to coat, which is beneficial for antibacterial activity. When in direct contact with bacteria, the nanosheet structure can disrupt cell membranes, leading to cell damage and death. On one hand, the nanosheet structure exhibits excellent antibacterial effects against both *Escherichia coli* and *Staphylococcus aureus* due to its unique physicochemical properties. On the other hand, myristylbenzyldimethylsaccharin ammonium contains quaternary ammonium groups, which are generally considered to cause cell membrane disruption. Therefore, the quaternary ammonium salt groups in the functional additive have a synergistic effect on antibacterial performance, significantly improving overall performance. The enhanced antifouling performance is mainly due to the cell disruption caused by the nanosheet structure and the quaternary ammonium group of myristylbenzyldimethylsaccharin ammonium, as well as the synergistic effect of the hydrogen bonding and solvation of the zwitterionic groups of myristylbenzyldimethylsaccharin ammonium to form an antiprotein adsorption hydration layer. The excellent antifouling performance comes from the dual effect of the nanosheet structure and myristylbenzyldimethylsaccharin ammonium.

Claims

1. An antibacterial and cleaning epoxy drinking water tank paint, characterized in that, The raw materials contain the following parts by weight: 25-35 parts solvent, 50-60 parts epoxy resin, 1-1.5 parts filler, 0.5-1 part emulsifier, 20-30 parts curing agent, 5-10 parts coloring pigment, 3-5 parts functional additives, 3-5 parts plasticizer, and 0.5-1 part defoamer; The preparation method of the functional additive is as follows, in parts by weight: S1. Dissolve 0.5-2 parts sodium hexafluorophosphate and 0.5-2 parts p-fluorobenzylamine in 15-25 parts 2-6 mol / L hydrochloric acid until completely dissolved. Then add 1-3 parts titanium aluminum carbide powder. Stir at 60-70℃ and 200-800 rpm for 50-120 h, centrifuge at 8000-12000 rpm for 3-8 min, wash with water until the pH of the washing solution is not less than 5.5-6.5, and freeze-dry under vacuum for 1-3 days to obtain the pretreated product. S2. Add 0.1-0.3 parts of the pretreated material prepared in step S1 to 40-60 parts of water, sonicate for 5-15 min at a power of 200-500 W and a frequency of 30-60 kHz, then add 0.04-0.08 parts of tris(hydroxymethyl)aminomethane, adjust the pH to 8-9 with 0.5-2 mol / L sodium hydroxide aqueous solution, add 0.01-0.02 parts of 3,4-methylenedioxyphenylethylamine, and stir overnight at 100-300 rpm at room temperature to obtain the complex. S3. Add 0.1 to 0.2 parts of the complex prepared in step S2 to 40 to 60 parts of Tris buffer, then add 0.04 to 0.06 parts of myristyl benzyl dimethyl saccharin ammonium, stir at 100 to 300 rpm at room temperature for 10 to 30 hours, and then vacuum dry to obtain the functional additive. The emulsifier is OP-10 emulsifier.

2. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The solvent is at least one of xylene, toluene, butanol, ethanol, isopropanol, cyclohexanone, acetone, methyl isobutyl ketone, ethylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol methyl ether.

3. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The filler is at least one of ceramic powder, nano silica, titanium dioxide, talc powder, mica powder, and bentonite.

4. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The curing agent is at least one of phenolic resin, polysaccharide anhydride, polyazelite anhydride, and polyisocyanate.

5. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The coloring pigment is at least one of iron oxide red, carbon black, and lemon chrome yellow.

6. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The plasticizer is at least one of dibutyl phthalate, dioctyl phthalate, diethyl phthalate, and benzyl alcohol.

7. The antibacterial and cleaning epoxy drinking water tank paint as described in claim 1, characterized in that, The defoamer is polydimethylsiloxane; the epoxy resin is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin, and glycidylamine type epoxy resin.

8. A method for preparing the antibacterial and cleaning epoxy drinking water tank paint as described in any one of claims 1 to 7, characterized in that, The method is as follows: Weigh each raw material according to the specified weight proportions. Mix the filler, emulsifier, coloring pigment, defoamer, and solvent, and add them to the epoxy resin. Heat to 80-90℃ and stir at 100-300 rpm for 4-6 hours. Then cool to 50-70℃, add the curing agent and plasticizer, and stir at 100-300 rpm for 5-8 hours. Cool to 40-50℃, add the functional additives, and stir at 100-300 rpm for 1-3 hours. Finally, cool to room temperature to obtain the antibacterial and cleaning epoxy drinking water tank paint.