A water-based paint-based stainless steel sheet and its application

Abstract

This invention relates to the field of stainless steel plate technology, and discloses a stainless steel plate based on water-based paint and its application. The stainless steel plate is made by spraying water-based paint onto the surface of a stainless steel plate. The water-based paint includes the following raw materials: methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, acrylic acid, antifouling modifier, emulsifier, deionized water, initiator, inorganic modifier additive, pigments and fillers, film-forming aid, leveling agent, and defoamer. The antifouling modifier is prepared by preparing a hydroxyl fluorosilicone oil derivative containing siloxane segments, fluorinated segments, and long alkyl chains. The inorganic modifier additive is prepared by chemically linking natamycin to the surface of titanium dioxide. The stainless steel plate prepared by this invention has excellent antifouling and antibacterial and antifungal properties, enhancing its market competitiveness.

Description

Technical Field

[0001] This invention relates to the field of stainless steel plate technology, and more specifically to a stainless steel plate based on water-based paint and its application. Background Technology

[0002] Stainless steel is an alloy steel that is not easy to rust. It has the advantages of corrosion resistance, high temperature resistance, high strength, and wear resistance. It is often used to make kitchen cabinets. The kitchen is a place where oil stains, water stains and food residue are easy to generate. During cooking, oil fumes, seasonings, and sewage can easily splash onto the surface of the cabinet. If the surface of the stainless steel does not have anti-fouling properties, these stains will quickly adhere and be difficult to clean. Over time, it will not only affect the appearance, but may also breed bacteria, posing a threat to food safety and the health of family members. In addition, because the cabinet is in a humid and hot environment for a long time, it is easy for bacteria to grow and mold to develop. This will not only destroy the aesthetic effect of the stainless steel, but also pose a potential threat to people's health.

[0003] To protect stainless steel sheets and extend their service life, the most common method is to spray paint on their surface to enhance their anti-fouling, antibacterial, and anti-mildew properties. With increasing environmental awareness, consumers are not only pursuing product practicality but also paying attention to whether products possess special environmental properties. Water-based paints, by using water as a solvent, reduce the use of harmful organic solvents, lowering the potential harm to the environment and human health. To enable water-based paints to possess anti-fouling, antibacterial, and anti-mildew properties, adding additives with these properties during the production process has become a hot research topic in the field of water-based paints.

[0004] The invention patent with announcement number CN106801229B discloses a method for preparing antibacterial stainless steel plates. This invention involves immersing the stainless steel plate in treatment solution A first, and then immersing it in treatment solution B, thereby forming a dense film on the surface of the stainless steel. This results in stainless steel plates with significant antibacterial properties, achieving a kill rate of over 98% against pathogenic bacteria such as Escherichia coli and Staphylococcus aureus. Furthermore, the plates are not easily worn and have good corrosion resistance. However, this invention does not improve the antifouling properties of the treatment solutions on the surface of the stainless steel plates. Summary of the Invention

[0005] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a stainless steel plate based on water-based paint and its application.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A stainless steel sheet based on water-based paint, wherein the stainless steel sheet is made by spraying water-based paint onto the surface of a stainless steel sheet; the water-based paint comprises the following raw materials in parts by weight: 30-40 parts methyl methacrylate, 20-30 parts butyl acrylate, 15-25 parts hydroxyethyl methacrylate, 10-20 parts acrylic acid, 4-8 parts antifouling modifier, 2-4 parts emulsifier, 30-40 parts deionized water, 1-3 parts initiator, 3-6 parts inorganic modifier additive, 5-15 parts pigments and fillers, 1-2 parts film-forming aid, 1-3 parts leveling agent, and 2-3 parts defoamer.

[0008] Furthermore, the preparation method of the antifouling modified component includes the following steps:

[0009] Hydroxyfluorosilicone oil and dimethyl sulfoxide solution were added to the reactor and mechanically stirred until homogeneous. Nitrogen gas was introduced to purge the air, and then maleic anhydride was added. The mixture was stirred at room temperature for 3–6 hours. Then, long alkyl alcohol and catalyst were added. The system temperature was raised to 90–110°C under stirring conditions and kept at that temperature for 4–8 hours. The solvent was removed by vacuum distillation, and the product was discharged to obtain the antifouling modified component.

[0010] Furthermore, the hydroxyl content in the hydroxyl fluorosilicone oil is 0.05–1.0 mol%.

[0011] Furthermore, the long alkyl alcohol is any one of dodecyl alcohol, tetradecyl alcohol, or octadecyl alcohol.

[0012] Furthermore, the catalyst is any one of p-toluenesulfonic acid, aminosulfonic acid, or trifluoromethanesulfonic acid.

[0013] Technical principle: In step A1, under the action of p-toluenesulfonic acid, the hydroxyl groups in the structure of hydroxy fluorosilicone oil undergo a ring-opening esterification reaction with maleic anhydride, thereby introducing active carboxyl groups generated by the ring-opening esterification reaction into the structure of hydroxy fluorosilicone oil, thus obtaining modified hydroxy fluorosilicone oil; In step A2, under the action of p-toluenesulfonic acid, the carboxyl groups in the structure of modified hydroxy fluorosilicone oil can undergo an esterification reaction with the hydroxyl groups in the structure of dodecyl alcohol, thereby grafting dodecyl alcohol into the structure of hydroxy fluorosilicone oil to obtain an antifouling modified component.

[0014] Furthermore, the preparation method of the inorganic modified additive includes the following steps:

[0015] Step AA1: Mix titanium dioxide with toluene solution, ultrasonically disperse for 25-35 min, add diacyl chloride monomer and sodium hydroxide solution, stir at room temperature for 3-6 h after addition, separate and collect the material to obtain modified titanium dioxide;

[0016] Step AA2: Add modified titanium dioxide and N,N-dimethylformamide to a nitrogen-protected reactor, stir evenly, then add natamycin and sodium hydroxide solution to the reactor, turn on heating, and stir at a constant temperature for 4-9 hours when the temperature rises to 60-70℃. Filter, collect the product, wash, and dry to obtain the inorganic modified additive.

[0017] Further, in step AA1, the diacyl chloride monomer is any one of succinyl chloride, glutaryl chloride, or adipyl chloride.

[0018] Furthermore, in step AA2, the mass ratio of the modified titanium dioxide to natamycin is 1:0.1 to 0.4.

[0019] Technical principle: In step AA1, under the action of sodium hydroxide solution, the acyl chloride group at one end of the glutaryl chloride structure can react with the hydroxyl group on the surface of titanium dioxide, modifying the surface of titanium dioxide with the acyl chloride group to obtain modified titanium dioxide; in step AA2, taking advantage of the high reactivity of the acyl chloride group, under the action of sodium hydroxide solution, it can further undergo an amidation reaction with the amino group in the natamycin structure, thereby chemically linking natamycin to the surface of titanium dioxide to obtain an inorganic modified additive.

[0020] Furthermore, the stainless steel plate is prepared using the following method:

[0021] Step 1: Preparation of water-based paint

[0022] I: Methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, acrylic acid, antifouling modifier, emulsifier and deionized water are added to a stirred tank. Nitrogen gas is purged to remove air. Then the initiator is added to the stirred tank. After the addition is complete, the system temperature is raised to 70-80℃ and stirred at a stirring rate of 400-600 r / min for 1-3 h to obtain a prepolymer emulsion.

[0023] II: Add inorganic modifiers, pigments, fillers, film-forming aids, leveling agents, and defoamers to the prepolymer emulsion, stir mechanically until uniform, and allow to stand to defoam to obtain water-based paint;

[0024] Step 2: Preparation of stainless steel plate

[0025] Soak a 304 stainless steel sheet in a degreasing solution for 20-40 minutes, remove it, rinse the stainless steel surface clean, then spray water-based paint evenly onto the surface of the stainless steel sheet and let it dry to obtain stainless steel.

[0026] An application of a water-based paint-based stainless steel sheet, which is then used in the kitchen cabinet industry.

[0027] The beneficial effects of this invention are:

[0028] (1) This invention prepares a water-based paint containing anti-fouling modified components and inorganic modified additives, which can be directly sprayed onto the surface of stainless steel plates, so that the prepared stainless steel plates have good anti-fouling and antibacterial properties. It can not only improve the decorative effect of stainless steel plates, but also protect stainless steel plates, improve their practicality and aesthetics in the field of kitchen cabinets, and effectively enhance the market competitiveness of stainless steel plates.

[0029] (2) This invention prepares an antifouling modified component as a filler modifier for water-based paints. Because its structure contains unsaturated alkenyl groups, it can participate in the cross-linking process of the matrix material to form a dense cross-linked network structure, which effectively blocks the penetration and adhesion of pollutants such as oil fumes, seasonings, and sewage, thereby improving the antifouling performance of water-based paints. In addition, the high cross-linking density and strong interfacial bonding force also help maintain the integrity and aesthetics of the coating, so that the antifouling effect can be maintained for a long time. Furthermore, the structure of the antifouling modified component contains strong hydrophobic siloxane segments, fluorinated segments, and long alkyl chains. The components work synergistically, resulting in a low surface energy of the prepared water-based paint. During the preparation of the water-based paint, these components will be released to the surface and form a superhydrophobic barrier on the surface, making it difficult for pollutants to penetrate into the water-based paint. This gives the water-based paint good antifouling ability, preventing stains from adhering to the surface of stainless steel plates, which poses a threat to food safety and the health of family members. Moreover, it is easy to clean, further enhancing the decorative effect of water-based paint on stainless steel plates.

[0030] (3) This invention prepares an inorganic modified additive by chemically linking natamycin to the surface of titanium dioxide. By organically modifying the surface of titanium dioxide, its dispersibility in the matrix can be improved, making it less prone to agglomeration during use. On the one hand, the titanium dioxide in the inorganic modified additive generates highly reactive photogenerated electrons and holes under light irradiation, which can have a destructive effect on the cell wall or membrane structure of bacteria, achieving the purpose of sterilization. Thus, the prepared water-based paint has excellent antibacterial properties. On the other hand, the natamycin in the inorganic modified additive can react with sterol compounds in the cell membrane, affecting its permeability, effectively inhibiting the growth of mold and other fungi, significantly improving the anti-mildew performance of water-based paint, and preventing stainless steel plates from becoming moldy due to long-term exposure to humid and hot environments, which poses a potential threat to people's health.

[0031] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The infrared spectrum of the antifouling modified component prepared in Example 1 of this invention is shown.

[0034] Figure 2 The infrared spectra of the modified titanium dioxide and inorganic modified additives prepared in Example 1 of this invention are shown. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] I. Preparation of antifouling modified components

[0038] Add 5g of 0.08mol% hydroxyl fluorosilicone oil and dimethyl sulfoxide solution to the reactor, stir mechanically until homogeneous, purge with nitrogen to remove air, add 1g of maleic anhydride, stir at room temperature for 5h, then add 1.4g of dodecanol and 0.08g of p-toluenesulfonic acid, raise the system temperature to 100℃ under stirring, keep at this temperature for 6h, remove the solvent by vacuum distillation, and discharge the product to obtain the antifouling modified component.

[0039] Infrared spectral analysis of the antifouling modified components was performed using a Nicolet 170sx Fourier transform infrared spectrometer, such as... Figure 1 As shown, by Figure 1 It can be seen that 1221cm -1 An absorption peak for CF appears at 1260 cm⁻¹. -1 An absorption peak for SiC appears at 1740 cm⁻¹. -1 An absorption peak appears at 3012 cm⁻¹ for the C=O group of the ester group. -1 An absorption peak appears at the carbon-hydrogen bond in the carbon-carbon double bond.

[0040] II. Preparation of Inorganic Modifying Additives

[0041] Step AA1: Mix 6g of titanium dioxide with toluene solution, sonicate for 30min, add 1.2g of glutaryl chloride and 0.05g of 50% sodium hydroxide solution, stir at room temperature for 5h after addition, separate and collect the material to obtain modified titanium dioxide;

[0042] Step AA2: Add 6g of modified titanium dioxide and N,N-dimethylformamide to a nitrogen-protected reactor. After stirring evenly, add 1.8g of natamycin and 0.1g of 50% sodium hydroxide solution to the reactor. Turn on the heating and stir at a constant temperature for 7 hours after the temperature rises to 65℃. Filter, collect the product, wash, and dry to obtain the inorganic modified additive.

[0043] Infrared spectral analysis of modified titanium dioxide and inorganic modified additives was performed using a Nicolet 170sx Fourier transform infrared spectrometer. Figure 2 As shown, by Figure 2 It can be seen that in the infrared spectrum of modified titanium dioxide, 1725 cm⁻¹ -1 An absorption peak appears at 1755 cm⁻¹ for the C=O group of the ester group. -1 An absorption peak for the C=O group in the acyl chloride group appears at 1750 cm⁻¹ in the infrared spectrum of the inorganic modified additive. -1 An absorption peak appears at 1720 cm⁻¹ for the C=O group of the ester group. -1 An absorption peak for the carboxyl group appears at 3310 cm⁻¹. -1 An absorption peak for NH in the amide appears at 1655 cm⁻¹. -1 An absorption peak for C=O in the amide appears at [location].

[0044] III. Preparation of Stainless Steel Plates

[0045] Step 1: Preparation of water-based paint

[0046] I: Add 30g methyl methacrylate, 20g butyl acrylate, 15g hydroxyethyl methacrylate, 10g acrylic acid, 4g antifouling modifier, 2g sodium dodecylbenzenesulfonate and 30g deionized water to a stirred tank, purge with nitrogen to remove air, then add 1g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 70℃ and stir at a stirring rate of 400r / min for 1h to obtain a prepolymer emulsion.

[0047] II: Add 3g of inorganic modifier, 5g of carbon black, 1g of propylene glycol, 1g of leveling agent RM-2020 and 2g of dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, and let stand to defoam to obtain water-based paint;

[0048] Step 2: Preparation of stainless steel plate

[0049] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 20 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet and let it dry to obtain stainless steel.

[0050] Example 2

[0051] Preparation of stainless steel plates

[0052] Step 1: Preparation of water-based paint

[0053] I: Add 35g methyl methacrylate, 25g butyl acrylate, 20g hydroxyethyl methacrylate, 15g acrylic acid, 6g antifouling modifier, 3g sodium dodecylbenzenesulfonate and 35g deionized water to a stirred tank, purge with nitrogen to remove air, then add 2g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 75℃ and stir at a stirring rate of 500r / min for 2h to obtain a prepolymer emulsion.

[0054] II: Add 5g of inorganic modifier, 10g of carbon black, 1.5g of propylene glycol, 2g of leveling agent RM-2020 and 2.5g of dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, and let stand to defoam to obtain water-based paint.

[0055] Step 2: Preparation of stainless steel plate

[0056] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 30 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet, and let it dry to obtain stainless steel.

[0057] The preparation methods for the antifouling modified components and inorganic modified additives are the same as in Example 1.

[0058] Example 3

[0059] Preparation of stainless steel plates

[0060] Step 1: Preparation of water-based paint

[0061] I: Add 40g methyl methacrylate, 30g butyl acrylate, 25g hydroxyethyl methacrylate, 20g acrylic acid, 8g antifouling modifier, 4g sodium dodecylbenzenesulfonate and 40g deionized water to a stirred tank, purge with nitrogen to remove air, then add 3g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 80℃ and stir at a stirring rate of 600r / min for 3h to obtain a prepolymer emulsion.

[0062] II: Add 6g of inorganic modifier, 15g of carbon black, 2g of propylene glycol, 3g of leveling agent RM-2020 and 3g of dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, and let stand to defoam to obtain water-based paint.

[0063] Step 2: Preparation of stainless steel plate

[0064] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 40 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet and let it dry to obtain stainless steel.

[0065] The preparation methods for the antifouling modified components and inorganic modified additives are the same as in Example 1.

[0066] Comparative Example 1

[0067] Preparation of stainless steel plates

[0068] Step 1: Preparation of water-based paint

[0069] I: Add 35g methyl methacrylate, 25g butyl acrylate, 20g hydroxyethyl methacrylate, 15g acrylic acid, 6g antifouling modifier, 3g sodium dodecylbenzenesulfonate and 35g deionized water to a stirred tank, purge with nitrogen to remove air, then add 2g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 75℃ and stir at a stirring rate of 500r / min for 2h to obtain a prepolymer emulsion.

[0070] II: Add 10g carbon black, 1.5g propylene glycol, 2g leveling agent RM-2020 and 2.5g dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, let stand to defoam, and then obtain water-based paint;

[0071] Step 2: Preparation of stainless steel plate

[0072] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 30 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet, and let it dry to obtain stainless steel.

[0073] The preparation method of the antifouling modified component is the same as that in Example 1.

[0074] Comparative Example 2

[0075] Preparation of stainless steel plates

[0076] Step 1: Preparation of water-based paint

[0077] I: Add 35g methyl methacrylate, 25g butyl acrylate, 20g hydroxyethyl methacrylate, 15g acrylic acid, 3g sodium dodecylbenzenesulfonate and 35g deionized water to a stirred tank, purge with nitrogen to remove air, then add 2g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 75℃ and stir at a stirring rate of 500r / min for 2h to obtain a prepolymer emulsion.

[0078] II: Add 5g of inorganic modifier, 10g of carbon black, 1.5g of propylene glycol, 2g of leveling agent RM-2020 and 2.5g of dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, and let stand to defoam to obtain water-based paint.

[0079] Step 2: Preparation of stainless steel plate

[0080] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 30 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet, and let it dry to obtain stainless steel.

[0081] The preparation method of the inorganic modified additive is the same as that in Example 1.

[0082] Comparative Example 3

[0083] Preparation of stainless steel plates

[0084] Step 1: Preparation of water-based paint

[0085] I: Add 35g methyl methacrylate, 25g butyl acrylate, 20g hydroxyethyl methacrylate, 15g acrylic acid, 6g antifouling modifier, 3g sodium dodecylbenzenesulfonate and 35g deionized water to a stirred tank, purge with nitrogen to remove air, then add 2g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 75℃ and stir at a stirring rate of 500r / min for 2h to obtain a prepolymer emulsion.

[0086] II: Add 4g titanium dioxide, 1g natamycin, 10g carbon black, 1.5g propylene glycol, 2g leveling agent RM-2020 and 2.5g dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, let stand to defoam, and then obtain water-based paint;

[0087] Step 2: Preparation of stainless steel plate

[0088] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 30 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet, and let it dry to obtain stainless steel.

[0089] The preparation method of the antifouling modified component is the same as that in Example 1.

[0090] Comparative Example 4

[0091] Preparation of stainless steel plates

[0092] Step 1: Preparation of water-based paint

[0093] I: Add 35g methyl methacrylate, 25g butyl acrylate, 20g hydroxyethyl methacrylate, 15g acrylic acid, 3g sodium dodecylbenzenesulfonate and 35g deionized water to a stirred tank, purge with nitrogen to remove air, then add 2g azobisisobutyronitrile to the stirred tank. After the addition is complete, raise the system temperature to 75℃ and stir at a stirring rate of 500r / min for 2h to obtain a prepolymer emulsion.

[0094] II: Add 10g carbon black, 1.5g propylene glycol, 2g leveling agent RM-2020 and 2.5g dimethyl silicone oil to the prepolymer emulsion, stir mechanically until uniform, let stand to defoam, and then obtain water-based paint;

[0095] Step 2: Preparation of stainless steel plate

[0096] Immerse the 304 stainless steel sheet in a sodium hydroxide solution for 30 minutes, remove it, rinse the stainless steel surface clean, then evenly spray water-based paint onto the surface of the stainless steel sheet, and let it dry to obtain stainless steel.

[0097] Performance testing:

[0098] The stainless steel samples prepared in Examples 1-3 and Comparative Examples 1-4 of this invention were made into samples conforming to specifications. Water contact angle tests were performed on the samples using a Beijing JYSP-180 contact angle meter to evaluate the antifouling performance of the stainless steel plate surface. The antibacterial rate of the samples was calculated according to GB / T 21866-2008 "Determination of Antibacterial Properties and Antibacterial Effects of Antibacterial Coatings (Films)" to evaluate the antibacterial performance of the stainless steel plate surface. Staphylococcus aureus was selected as the experimental microorganism. The antifungal performance of the samples was tested according to GB / T 1741-2020 "Determination of Antifungal Resistance of Coatings" to evaluate the antifungal performance of the stainless steel plate surface. Aspergillus niger was selected as the mold. Specific test results are shown in Table 1.

[0099] Table 1 - Performance Testing

[0100] Water contact angle (°) Antibacterial rate (%) Mildew resistance rating (level) Example 1 154 99.3 0 Example 2 156 99.5 0 Example 3 153 99.1 0 Comparative Example 1 150 64.8 3 Comparative Example 2 112 99.0 0 Comparative Example 3 151 88.5 2 Comparative Example 4 106 60.3 4

[0101] As shown in Table 1, the stainless steel plates prepared in Examples 1-3, with antifouling modifiers and inorganic additives added to their water-based paint, exhibited a water contact angle greater than 150°, demonstrating superhydrophobicity, an antibacterial rate greater than 99%, and a mildew resistance level of 0, all possessing excellent antifouling and antibacterial / mildew resistance. The stainless steel plate prepared in Comparative Example 1, lacking inorganic additives in its water-based paint, showed poorer antibacterial and mildew resistance compared to the examples. The stainless steel plate prepared in Comparative Example 2, also lacking antifouling modifiers in its water-based paint, showed a significant decrease in water contact angle, indicating poor antifouling performance. Compared to the examples, the stainless steel plate prepared in Comparative Example 3 had antifouling modifiers, titanium dioxide, and natamycin added to its surface water-based paint. Compared to the examples, the stainless steel plate showed better antifouling performance, but poorer antibacterial and antifungal performance. This was because the titanium dioxide was not organically modified, resulting in agglomeration in the matrix, and small natamycin molecules showed precipitation and migration, leading to a reduction in the antibacterial and antifungal effect of the stainless steel plate. The stainless steel plate prepared in Comparative Example 4 did not have antifouling modifiers or inorganic modifiers added to its surface water-based paint, therefore, the antifouling and antibacterial / antifungal performance of this stainless steel plate was the worst.

[0102] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A stainless steel sheet based on water-based paint, characterized in that, The stainless steel plate is made by spraying a water-based paint onto its surface. The water-based paint comprises the following raw materials in parts by weight: 30-40 parts methyl methacrylate, 20-30 parts butyl acrylate, 15-25 parts hydroxyethyl methacrylate, 10-20 parts acrylic acid, 4-8 parts antifouling modifier, 2-4 parts emulsifier, 30-40 parts deionized water, 1-3 parts initiator, 3-6 parts inorganic modifier additive, 5-15 parts pigments and fillers, 1-2 parts film-forming aid, 1-3 parts leveling agent, and 2-3 parts defoamer. The preparation method of the antifouling modified component includes the following steps: Hydroxyfluorosilicone oil and dimethyl sulfoxide solution were added to the reactor and mechanically stirred until homogeneous. Nitrogen gas was introduced to purge the air, and then maleic anhydride was added. The mixture was stirred at room temperature for 3–6 hours. Then, long alkyl alcohol and catalyst were added. The system temperature was raised to 90–110°C under stirring conditions and kept at that temperature for 4–8 hours. The solvent was removed by vacuum distillation, and the product was discharged to obtain the antifouling modified component. The catalyst is any one of p-toluenesulfonic acid, aminosulfonic acid, or trifluoromethanesulfonic acid; The preparation method of the inorganic modified additive includes the following steps: Step AA1: Mix titanium dioxide with toluene solution, ultrasonically disperse for 25-35 min, add diacyl chloride monomer and sodium hydroxide solution, stir at room temperature for 3-6 h after addition, separate and collect the material to obtain modified titanium dioxide; Step AA2: Add modified titanium dioxide and N,N-dimethylformamide to a nitrogen-protected reactor, stir evenly, then add natamycin and sodium hydroxide solution to the reactor, turn on heating, and stir at a constant temperature for 4-9 hours when the temperature rises to 60-70℃. Filter, collect the product, wash, and dry to obtain the inorganic modified additive.

2. The stainless steel sheet based on water-based paint according to claim 1, characterized in that, The hydroxyl content in the hydroxyl fluorosilicone oil is 0.05–1.0 mol.

3. The stainless steel sheet based on water-based paint according to claim 1, characterized in that, The long alkyl alcohol is any one of dodecyl alcohol, tetradecyl alcohol, or octadecyl alcohol.

4. The stainless steel sheet based on water-based paint according to claim 1, characterized in that, In step AA1, the diacyl chloride monomer is any one of succinyl chloride, glutaryl chloride, or adipyl chloride.

5. A stainless steel sheet based on water-based paint according to claim 1, characterized in that, In step AA2, the mass ratio of the modified titanium dioxide to natamycin is 1:0.1 to 0.

4.

6. The stainless steel sheet based on water-based paint according to claim 1, characterized in that, The stainless steel plate is prepared using the following method: Step 1: Preparation of water-based paint I: Methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, acrylic acid, antifouling modifier, emulsifier and deionized water are added to a stirred tank. Nitrogen gas is purged to remove air. Then the initiator is added to the stirred tank. After the addition is complete, the system temperature is raised to 70-80℃ and stirred at a stirring rate of 400-600 r / min for 1-3 h to obtain a prepolymer emulsion. II: Add inorganic modifiers, pigments, fillers, film-forming aids, leveling agents, and defoamers to the prepolymer emulsion, stir mechanically until uniform, and allow to stand to defoam to obtain water-based paint; Step 2: Preparation of stainless steel plate Soak the stainless steel sheet in degreasing solution for 20-40 minutes, remove it, rinse the stainless steel surface clean, then spray water-based paint evenly onto the surface of the stainless steel sheet, and dry it to obtain the stainless steel sheet.

7. An application of a stainless steel sheet based on water-based paint as described in claim 1, characterized in that, The stainless steel sheet is applied to the kitchen cabinet industry.

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