High-antibacterial-property coating and preparation method thereof

Abstract

The invention relates to a high-antibacterial-property coating and a preparation method thereof. The high-antibacterial-property coating is prepared from the following raw materials in parts by weight: 35-40 parts of epoxy resin, 2-6 parts of inorganic nano filler, 0.5-1.5 parts of an inorganic antibacterial agent, 0.2-0.6 part of an organic antibacterial agent, 1-3 parts of a silane coupling agent, 8-12 parts of a curing agent, 3-5 parts of a diluent, 0.5-1.0 part of a defoaming agent, 0.1-0.3 part of a flatting agent and 50-100 parts of a solvent. The organic antibacterial agent is a 1, 3, 5-triazine compound. The antibacterial stainless steel surface coating has the effect of improving the antibacterial property of the stainless steel surface coating.

Description

Technical Field

[0001] This application relates to the field of coating materials, and in particular to a highly antibacterial coating and a method for preparing the same. Background Technology

[0002] The development of high-performance coatings has brought more possibilities to functional surface treatments. Among them, antibacterial coatings, as an important branch, have broad application prospects in many fields such as food packaging, medical and health care, and household products. The core of stainless steel coatings is to achieve safe, stable, and long-lasting antibacterial effects through coating on the original properties of the stainless steel substrate. It also needs to closely match the usage characteristics of the application scenario while taking into account compatibility with the stainless steel substrate, making the research and development of related high-performance coatings a key technology. In related technologies, antibacterial agents are usually added to the raw materials to improve the antibacterial performance of stainless steel coatings. Organic antibacterial agents have the characteristics of fast bactericidal speed and broad antibacterial spectrum, such as quaternary ammonium salts and phenols; inorganic antibacterial agents have advantages such as good stability and strong durability, such as silver-based antibacterial agents. Regarding the above-mentioned related technologies, the inventors believe that the addition of a single antibacterial agent often only works against specific types of bacteria, with a narrow antibacterial spectrum, making it difficult to meet the antibacterial needs in complex environments. Summary of the Invention

[0003] To improve the antibacterial properties of stainless steel surface coatings, this application provides a highly antibacterial coating and its preparation method.

[0004] In a first aspect, this application provides a highly antibacterial coating, employing the following technical solution: A highly antibacterial coating comprises the following raw materials in parts by weight: 35-40 parts epoxy resin, 2-6 parts inorganic nanofiller, 0.5-1.5 parts inorganic antibacterial agent, 0.2-0.6 parts organic antibacterial agent, 1-3 parts silane coupling agent, 8-12 parts curing agent, 3-5 parts diluent, 0.5-1.0 parts defoamer, 0.1-0.3 parts leveling agent, and 50-100 parts solvent; wherein the organic antibacterial agent is a 1,3,5-triazine compound.

[0005] By adopting the above technical solution, this application uses epoxy resin as the polymer matrix, combines inorganic nanofillers and silane coupling agents to construct a dense and stable coating structure, and adds inorganic and organic antibacterial agents to achieve organic-inorganic synergistic antibacterial effect, so that the high antibacterial coating has good antibacterial properties; the silane coupling agent can form chemical bonds between inorganic nanofillers and epoxy resin, and between inorganic / organic antibacterial agents and epoxy resin, improving the dispersion stability of organic / inorganic antibacterial agents; the inorganic antibacterial agent is dispersed in the epoxy matrix and slowly releases active ions, which act on the intracellular metabolic system, thereby achieving an antibacterial effect; The 1,3,5-triazine ring is a nitrogen-containing heterocycle with good electron-withdrawing ability. 1,3,5-triazine compounds usually contain electrophilic substituents, which can undergo electrophilic substitution reactions with proteins or lipids in bacterial cell membranes, disrupting the integrity of the cell membrane. They also inhibit bacterial folic acid metabolism and bacterial cell proliferation by inhibiting DHFR enzymes, which catalyze key steps in folic acid synthesis.

[0006] Preferably, the inorganic nanofiller is at least one of nano-SiO2 and nano-Al2O3.

[0007] By adopting the above technical solutions, nano-SiO2 and nano-Al2O3 have the characteristics of small particle size and large specific surface area. They can form a uniformly dispersed inorganic skeleton structure in the epoxy resin system, which helps to improve the wear resistance of the high antibacterial coating. The surface of nano-SiO2 and nano-Al2O3 is rich in hydroxyl groups, which can form a stable interfacial bond with inorganic antibacterial agents under the action of silane coupling agents, increasing the effective exposure area of ​​inorganic antibacterial agents in the coating and promoting the uniform distribution of antibacterial active ions on the coating surface, thereby helping to improve the antibacterial properties of the high antibacterial coating.

[0008] Preferably, the inorganic nanofiller is nano-SiO2.

[0009] By adopting the above technical solution, the surface of nano-SiO2 is rich in -Si-OH, which can form hydrogen bonds with hydroxyl and ether oxygen bonds in epoxy resin through hydrogen bonds to generate interfacial adsorption, or form Si-O-Si covalent bonds under the action of silane coupling agent. During the curing process, it undergoes cross-linking reaction with epoxy resin and forms an inorganic-organic composite three-dimensional framework, reducing the migration of inorganic and organic antibacterial agents in the resin matrix, which helps to improve the density and antibacterial properties of the high antibacterial coating.

[0010] Preferably, the inorganic nanofiller is a mixture of nano-SiO2 and nano-Al2O3.

[0011] Preferably, the mass ratio of the nano-SiO2 to the nano-Al2O3 is 1:0.15-0.25.

[0012] By adopting the above technical solution, nano-SiO2 has the characteristics of high specific surface area and rich hydroxyl groups, which will preferentially form a continuous three-dimensional skeleton with silane coupling agent and epoxy resin. Nano-Al2O3 has the characteristics of high hardness and high modulus, and can serve as a rigid reinforcement point in the three-dimensional skeleton. The two are spatially interspersed, which helps to form a composite skeleton of flexible network + rigid support, which helps to disperse stress concentration and improve the wear resistance of high antibacterial coating. If the content of nano-Al2O3 is too high, the nano-Al2O3 has fewer hydroxyl groups on its surface and a lower compatibility with epoxy resin, which will lead to discontinuity of the three-dimensional skeleton. This will result in a decrease in the wear resistance of the high antibacterial coating. In addition, a large amount of nano-Al2O3 is prone to agglomeration in the three-dimensional skeleton, which will result in uneven distribution of antibacterial active components on the surface, leading to a decrease in the antibacterial properties of the high antibacterial coating. If the content of nano-Al2O3 is too low, the rigidity of the three-dimensional skeleton will be insufficient due to the lack of rigid support from nano-Al2O3, resulting in a decrease in the wear resistance of the high antibacterial coating. Furthermore, the antibacterial active components will be exposed too quickly after the surface wears out, leading to a reduction in the antibacterial durability of the high antibacterial coating.

[0013] Preferably, the inorganic antibacterial agent is a silver-loaded zirconium phosphate antibacterial agent.

[0014] By adopting the above technical solution, the silver-loaded zirconium phosphate antibacterial agent uses layered or framework-type zirconium phosphate as a carrier to carry Ag... + Ag is immobilized in the crystal lattice through ion exchange or coordination and slowly released in the presence of water or trace electrolytes. + This achieves a long-lasting antibacterial effect; the zirconium phosphate particles have -OH and -PO4 sites on their surface, which can undergo condensation reactions with the -Si-OH formed by the hydrolysis of silane coupling agents to form stable Zr-O-Si or PO-Si bonds, thereby embedding them into the epoxy network and effectively reducing Ag. + High-concentration migration of Ag + The slow release of the substance helps to enhance the antibacterial properties of the highly antibacterial coating.

[0015] Preferably, the organic antibacterial agent is 2-chloro-4,6-diamino-1,3,5-triazine.

[0016] By adopting the above technical solution, the amino groups at positions 4 and 6 of 2-chloro-4,6-diamino-1,3,5-triazine readily bind to the carbonyl and hydroxyl groups on the surface of bacterial proteins, as well as the carbonyl and phosphate groups of key bacterial enzymes, and achieve directional adsorption of bacterial proteins and enzyme systems through multi-point hydrogen bonding. The chlorine atom at position 2 of 2-chloro-4,6-diamino-1,3,5-triazine is electrophilic and can undergo nucleophilic reactions with -SH, -NH2, and -OH on bacterial membrane proteins, thereby disrupting membrane permeability and achieving the contact bactericidal capability of the highly antibacterial coating.

[0017] Preferably, the silane coupling agent is an aminosilane coupling agent.

[0018] By adopting the above technical solution, the amino terminus of the aminosilane coupling agent can undergo a ring-opening reaction with epoxy resin, thereby improving the structural strength of the three-dimensional skeleton. Furthermore, the amino group can improve the surface compatibility of nano-SiO2 and nano-Al2O3, reduce the agglomeration of inorganic nanofillers, and increase the dispersion of inorganic nanofillers in the three-dimensional skeleton. This helps to construct a continuous and stable inorganic-organic composite network structure, thereby enhancing the density and antibacterial properties of the high-antibacterial coating.

[0019] Secondly, this application provides a method for preparing a highly antibacterial coating, employing the following technical solution: A method for preparing a highly antibacterial coating includes the following steps: Preparation of antibacterial dispersion system: Add the prescribed amounts of inorganic nanofiller, inorganic antibacterial agent and silane coupling agent to the solvent and grind them. After thorough mixing, a modified dispersion is obtained. Preparation of matrix solution: Mix the epoxy resin, organic antibacterial agent and diluent according to the formula, stir evenly to obtain epoxy resin matrix solution; Preparation of coating: The modified dispersion is added to the epoxy resin matrix solution and stirred evenly. Then, the defoamer and leveling agent are added in sequence. The entire process is carried out with heating and stirring. After the mixture is evenly mixed, the curing agent is added and stirred to obtain a high antibacterial coating. Coating preparation: The high antibacterial coating is uniformly sprayed, brushed or rolled onto the surface of the metal substrate and cured into a film at room temperature or under heating conditions to obtain a high antibacterial coating.

[0020] By adopting the above technical solution, through the steps of dispersion system preparation, matrix solution formulation, coating compounding, and film formation, highly uniform dispersion and stable bonding of inorganic nanofillers and inorganic / organic antibacterial agents in the epoxy resin system are achieved. The grinding process promotes the full interaction between inorganic nanofillers and silane coupling agents, enhancing their compatibility and dispersibility in the epoxy resin matrix. Stepwise mixing and continuous stirring ensure that organic and inorganic antibacterial components are evenly distributed in the system and form a synergistic antibacterial network. Through a controllable construction and curing process, a dense, stable, and long-lasting antibacterial protective film is formed on the surface of the metal substrate, effectively improving the antibacterial performance, adhesion, and durability of the coating. This provides a feasible and effective technical approach for achieving highly efficient, durable, and widely applicable high antibacterial coatings.

[0021] In summary, this application includes at least one of the following beneficial technical effects: This application uses epoxy resin as the polymer matrix, combines inorganic nanofillers and silane coupling agents to construct a dense and stable coating structure, and adds inorganic and organic antibacterial agents to achieve organic-inorganic synergistic antibacterial effect, so that the high antibacterial coating has good antibacterial properties and density. The 1,3,5-triazine ring is a nitrogen-containing heterocycle with good electron-withdrawing ability. 1,3,5-triazine compounds usually contain electrophilic substituents, which can undergo electrophilic substitution reactions with proteins or lipids in bacterial cell membranes, destroy the integrity of the cell membrane, and inhibit bacterial folic acid metabolism by inhibiting DHFR enzyme, which is a key step in folic acid synthesis, thereby inhibiting bacterial cell proliferation. Zirconium phosphate silver-loaded antibacterial agents use layered or framework-type zirconium phosphate as a carrier to transfer Ag... + Ag is immobilized in the crystal lattice through ion exchange or coordination and slowly released in the presence of water or trace electrolytes. + This achieves a long-lasting antibacterial effect; the zirconium phosphate particles have -OH and -PO4 sites on their surface, which can undergo condensation reactions with the -Si-OH formed by the hydrolysis of silane coupling agents to form stable Zr-O-Si or PO-Si bonds, thereby embedding them into the epoxy network and effectively reducing Ag. + High-concentration migration of Ag + The slow release of the substance helps to enhance the antibacterial properties of the highly antibacterial coating; By selecting 2-chloro-4,6-diamino-1,3,5-triazine as an organic antibacterial agent, the amino groups at positions 4 and 6 of 2-chloro-4,6-diamino-1,3,5-triazine readily bind to the carbonyl and hydroxyl groups on the surface of bacterial proteins, as well as the carbonyl and phosphate groups of key bacterial enzymes, and achieve targeted adsorption of bacterial proteins and enzyme systems through multi-point hydrogen bonding. The chlorine atom at position 2 of 2-chloro-4,6-diamino-1,3,5-triazine is electrophilic and can undergo nucleophilic reactions with -SH, -NH2, and -OH groups on bacterial membrane proteins, disrupting membrane permeability, thereby achieving the contact bactericidal capability of the highly antibacterial coating. Detailed Implementation

[0022] The raw materials in this application include the following: Epoxy resin: Bisphenol A type epoxy resin, bisphenol F type epoxy resin, etc. can be selected. This application takes the commercially available bisphenol A type epoxy resin with CAS number 25085-99-8 as an example. Nano SiO2: The product used is commercially available product CT01 manufactured by Shouguang Changtai New Materials Co., Ltd. Nano Al2O3: The product used is a commercially available product with model number 1344-28-1 manufactured by Shandong Huling New Materials Co., Ltd. Silver zirconium phosphate: The product used is the commercially available product HN-TA32ag manufactured by Hangzhou Hengna New Materials Co., Ltd. 2-Chloro-4,6-diamino-1,3,5-triazine: Use a commercially available product with CAS number 3397-62-4; Silane coupling agents: KH-550, KH-792 and KH-602 can be selected. This application uses the commercially available product KH-550 with CAS number 919-30-2 as an example. Curing agent: Commercially available IDPA product with CAS number 2855-13-2; Diluents: Alkyl glycidyl ethers, DGE-NPG, etc. can be used. This application uses commercially available alkyl glycidyl ether products with CAS number 68609-97-2 as an example. Defoamer: BYK-141, BYK-066N, BYK-065, etc. can be selected. This application takes the commercially available product BYK-141 produced by Shenyang Xingzhenghe Chemical Co., Ltd. as an example. Leveling agent: BYK-346, BYK-306, etc. can be selected. This application takes the commercially available product BYK-346 produced by Jining Tangyi Chemical Co., Ltd. as an example. Xylene: Use commercially available products with CAS number 1330-20-7; Silver-loaded silica antibacterial agent: The product used is a commercially available silver-loaded silica ion antibacterial agent manufactured by Qinghe County Ruijiang Metal Materials Co., Ltd.

[0023] The present application will be further described in detail below with reference to embodiments and comparative examples. Example 1

[0024] A highly antibacterial coating comprising the following components: Epoxy resin 38kg, nano SiO2 3.33kg, nano Al2O3 0.67kg, zirconium phosphate silver-loaded antibacterial agent 1kg, 2-chloro-4,6-diamino-1,3,5-triazine 0.4kg, KH-550 2kg, IPDA 10kg, diluent 4kg, defoamer 0.8kg, leveling agent 0.2kg, xylene 75kg.

[0025] A method for preparing a highly antibacterial coating includes the following steps: Preparation of antibacterial dispersion system: The formulated amounts of nano SiO2, nano Al2O3, zirconium phosphate silver-loaded antibacterial agent, and KH-550 were added to xylene solvent and ball milled for 4 hours at a speed of 300 rpm. After grinding, the grinding balls were separated by filtering with a 200-mesh sieve, and the fineness of the slurry was tested to ≤50μm to obtain a modified dispersion. Preparation of matrix solution: Place the prescribed amount of diluent in a mixing container, add the prescribed amount of 2-chloro-4,6-diamino-1,3,5-triazine while stirring at 300 rpm, and continue stirring for 12 min to allow it to disperse initially. Then add the prescribed amount of epoxy resin, increase the stirring speed to 500 rpm, and continue stirring in a 45°C water bath for 40 min until the system is homogeneous and transparent or without obvious particles, thus obtaining the epoxy resin matrix solution. Preparation of coating: Add the modified dispersion to the epoxy resin matrix solution, stir evenly, and then add the defoamer and leveling agent in sequence. Keep heating and stirring throughout the process, control the temperature at 45℃, the stirring speed at 1000rpm, and the time at 30min. After mixing evenly, add the curing agent and continue stirring for 15min to obtain a high antibacterial coating. Substrate pretreatment: Wipe the surface of the stainless steel workpiece with sufficient acetone. After degreasing, wet sand it with 240-grit sandpaper until the surface is uniformly matte. After a second cleaning with acetone, dry it thoroughly in an environment with a temperature of 25±5℃ and a humidity of ≤60% to obtain the stainless steel substrate. Coating preparation: The high antibacterial coating is uniformly sprayed, brushed or rolled onto the surface of the stainless steel substrate, cured at 80℃ for 3 hours, with the relative humidity of the environment controlled at ≤60%, the ambient temperature at 25±5℃, and the dry film thickness within the range of 50±5μm. The coating is left in the environment until the surface is completely dry to obtain the high antibacterial coating.

[0026] Example 2-3 Based on the preparation method of Example 1, the component ratio of the high antibacterial coating was adjusted, as shown in Table 1.

[0027] Comparative Examples 1-2 Based on the preparation method of Example 1, the component ratio of the high antibacterial coating was adjusted, as shown in Table 1.

[0028] Performance testing The highly antibacterial coatings of Examples 1-3 and Comparative Examples 1-2 were analyzed using the following specific testing methods: (1) Antibacterial properties The antibacterial properties of high-antimicrobial stainless steel were tested using the coating method according to JIS Z2801-2000 standard. *Escherichia coli* (ATCC 25922) and *Staphylococcus aureus* (ATCC 25923) were used as test bacteria, and a concentration of 10 was prepared. 5CFU / mL bacterial suspension was uniformly added dropwise to the surfaces of the highly antibacterial stainless steel prepared in the examples and comparative examples, with a bacterial suspension volume of 0.4 mL. Subsequently, a sterile polyethylene film was coated onto the highly antibacterial stainless steel surface, and the samples were incubated in a constant temperature incubator at 36±1℃ for 24 h. Viable bacteria were then counted. Comparative example 1 served as the control group, and the others as experimental groups. The antibacterial rate of the highly antibacterial stainless steel was calculated. Antibacterial rate = (number of viable bacteria) 对照组 - viable bacteria count 实验组 ) / viable count 对照组 ×100%.

[0029] Based on the above detection method, the test results of Examples 1-3 and Comparative Examples 1-2 were obtained, as shown in Table 1 below.

[0030] Table 1. Composition ratios and performance test data of the high antibacterial coatings of Examples 1-3 and Comparative Examples 1-2

[0031] Referring to Table 1, the antibacterial properties of the high-antimicrobial coatings in Examples 1-3 are superior to those in Comparative Example 2. This is because the nitrogen-containing heterocycle in 2-chloro-4,6-diamino-1,3,5-triazine has excellent electron-withdrawing ability. 2-chloro-4,6-diamino-1,3,5-triazine typically contains electrophilic substituents, which can undergo electrophilic substitution reactions with proteins or lipids in bacterial cell membranes, disrupting cell membrane integrity. Furthermore, it inhibits bacterial folic acid metabolism by suppressing DHFR enzymes, a key step in folic acid synthesis, thereby inhibiting bacterial cell cell turnover. Cell proliferation; the amino groups at positions 4 and 6 of 2-chloro-4,6-diamino-1,3,5-triazine readily bind to carbonyl and hydroxyl groups on the surface of bacterial proteins, as well as carbonyl and phosphate groups of key bacterial enzymes, and achieve targeted adsorption of bacterial proteins and enzyme systems through multi-point hydrogen bonding; the chlorine atom at position 2 of 2-chloro-4,6-diamino-1,3,5-triazine is electrophilic and can undergo nucleophilic reactions with -SH, -NH2, and -OH groups on bacterial membrane proteins, disrupting membrane permeability, thereby achieving the contact bactericidal ability of the highly antibacterial coating. Example

[0032] Based on the preparation method in Example 1, the mixture of nano-SiO2 and nano-Al2O3 was replaced with an equal amount of nano-SiO2, while the other conditions remained unchanged. Example

[0033] Based on the preparation method in Example 1, the mixture of nano-SiO2 and nano-Al2O3 was replaced with an equal amount of nano-Al2O3, while the other conditions remained unchanged.

[0034] Performance testing The highly antibacterial coatings of Examples 1 and 4-5 were analyzed using the following specific testing methods: (2) Abrasion resistance Abrasion resistance test was conducted in accordance with GB / T1768-2006. (3) Density The salt spray resistance of the coating film was tested according to GB / T 1771-2007 standard.

[0035] Based on the above detection method, the test results of Examples 1 and 4-5 were obtained, as shown in Table 2 below.

[0036] Table 2 Performance test data of the high antibacterial coatings in Examples 1 and 4-5

[0037] Referring to Table 2, the performance of the high antibacterial coating in Example 1 is superior to that in Examples 4-5. This is because the surface of nano-SiO2 is rich in -Si-OH, which can form hydrogen bonds with hydroxyl and ether oxygen bonds in epoxy resin through hydrogen bonds, thereby generating interfacial adsorption, or form Si-O-Si covalent bonds under the action of silane coupling agent. During the curing process, it undergoes a cross-linking reaction with epoxy resin and forms an inorganic-organic composite three-dimensional skeleton, reducing the migration of inorganic and organic antibacterial agents in the resin matrix, which helps to improve the density and antibacterial properties of the high antibacterial coating. Nano-Al2O3 has the characteristics of high hardness and high modulus, and can serve as a rigid reinforcement point in the three-dimensional skeleton. The two are spatially staggered, which helps to form a composite skeleton of flexible network + rigid support, which helps to disperse stress concentration and improve the wear resistance of the high antibacterial coating.

[0038] Examples 6-9 Example

[0039] Based on the preparation method in Example 1, the mixing mass ratio of nano-SiO2 and nano-Al2O3 was adjusted to 1:0.15, while the other conditions remained unchanged. Example

[0040] Based on the preparation method in Example 1, the mixing mass ratio of nano-SiO2 and nano-Al2O3 was adjusted to 1:0.25, while the other conditions remained unchanged. Example

[0041] Based on the preparation method in Example 1, the mixing mass ratio of nano-SiO2 and nano-Al2O3 was adjusted to 1:0.10, while the other conditions remained unchanged. Example

[0042] Based on the preparation method in Example 1, the mixing mass ratio of nano-SiO2 and nano-Al2O3 was adjusted to 1:0.30, while the other conditions remained unchanged.

[0043] Based on the above detection method, the test results of Examples 6-9 were obtained, as shown in Table 3 below.

[0044] Table 3 Performance test data of the high antibacterial coatings in Examples 1 and 6-9

[0045] Referring to Table 3, the performance of the high antibacterial coating in Example 1 is better than that in Examples 6-9. This is because if the content of nano-Al2O3 is too high, the nano-Al2O3 surface has fewer hydroxyl groups, resulting in a lower compatibility with epoxy resin. This leads to discontinuity in the three-dimensional skeleton, which in turn reduces the wear resistance of the high antibacterial coating. Furthermore, a large amount of nano-Al2O3 tends to agglomerate within the three-dimensional skeleton, causing uneven distribution of antibacterial active components on the surface, thus reducing the antibacterial properties of the high antibacterial coating. If the content of nano-Al2O3 is too low, the lack of rigid support from nano-Al2O3 results in insufficient rigidity of the three-dimensional skeleton, leading to a decrease in the wear resistance of the high antibacterial coating. Moreover, the antibacterial active components are exposed too quickly after surface wear, resulting in reduced antibacterial durability of the high antibacterial coating. Example

[0046] Based on the preparation method in Example 1, the silver-loaded zirconium phosphate antibacterial agent was replaced with an equal amount of silver-loaded silica antibacterial agent, while the other conditions remained unchanged.

[0047] Performance testing The highly antibacterial coatings of Examples 1 and 10 were analyzed using the following specific testing methods: (4) Antibacterial durability The surface of the high antibacterial stainless steel was placed in an aging test chamber and subjected to an aging test for 28 days at a temperature of 37±1℃ and a relative humidity of 90±5%. The above-mentioned coating method test steps were then repeated to calculate the long-term antibacterial rate of the antibacterial stainless steel. Long-lasting antibacterial rate = (number of viable bacteria) 对照组 - viable bacteria count 老化实验组 ) / Viable bacteria count 对照组 ×100%.

[0048] The high antibacterial coatings of Examples 1 and 10 were subjected to the above performance tests, and the test results are shown in Table 4.

[0049] Table 4 Performance test data of the high antibacterial coatings in Examples 1 and 10

[0050] Referring to Table 4, the antibacterial performance of the high antibacterial coating in Example 1 is superior to that in Example 10. This is because the zirconium phosphate-loaded silver antibacterial agent uses layered or framework-type zirconium phosphate as a carrier to carry Ag...+ Ag is immobilized in the crystal lattice through ion exchange or coordination and slowly released in the presence of water or trace electrolytes. + This achieves a long-lasting antibacterial effect; the zirconium phosphate particles have -OH and -PO4 sites on their surface, which can undergo condensation reactions with the -Si-OH formed by the hydrolysis of silane coupling agents to form stable Zr-O-Si or PO-Si bonds, thereby embedding them into the epoxy network and effectively reducing Ag. + High-concentration migration of Ag + The slow release of the substance helps to enhance the antibacterial properties of the highly antibacterial coating.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A highly antibacterial coating, characterized in that, The raw materials include the following parts by weight: 35-40 parts epoxy resin, 2-6 parts inorganic nanofiller, 0.5-1.5 parts inorganic antibacterial agent, 0.2-0.6 parts organic antibacterial agent, 1-3 parts silane coupling agent, 8-12 parts curing agent, 3-5 parts diluent, 0.5-1.0 parts defoamer, 0.1-0.3 parts leveling agent, and 50-100 parts xylene; wherein the organic antibacterial agent is a 1,3,5-triazine compound.

2. The highly antibacterial coating according to claim 1, characterized in that, The inorganic nanofiller is at least one of nano SiO2 and nano Al2O3.

3. The highly antibacterial coating according to claim 2, characterized in that, The inorganic nanofiller is nano-SiO2.

4. The highly antibacterial coating according to claim 2, characterized in that, The inorganic nanofiller is a mixture of nano-SiO2 and nano-Al2O3.

5. The highly antibacterial coating according to claim 4, characterized in that, The mass ratio of nano-SiO2 to nano-Al2O3 is 1:0.15-0.

25.

6. The highly antibacterial coating according to claim 1, characterized in that, The inorganic antibacterial agent is a silver-loaded zirconium phosphate antibacterial agent.

7. The highly antibacterial coating according to claim 1, characterized in that, The organic antibacterial agent is 2-chloro-4,6-diamino-1,3,5-triazine.

8. The highly antibacterial coating according to claim 1, characterized in that, The silane coupling agent is an aminosilane coupling agent.

9. A method for preparing a highly antibacterial coating according to any one of claims 1-8, characterized in that, Includes the following steps: Preparation of antibacterial dispersion system: Add the prescribed amounts of inorganic nanofiller, inorganic antibacterial agent and silane coupling agent to the solvent and grind them. After thorough mixing, a modified dispersion is obtained. Preparation of matrix solution: Mix the epoxy resin, organic antibacterial agent and diluent according to the formula, stir evenly to obtain epoxy resin matrix solution; Preparation of coating: The modified dispersion is added to the epoxy resin matrix solution and stirred evenly. Then, the defoamer and leveling agent are added in sequence. The entire process is carried out with heating and stirring. After the mixture is evenly mixed, the curing agent is added and stirred to obtain a high antibacterial coating. Coating preparation: The high antibacterial coating is uniformly applied to the surface of the metal substrate and cured into a film at room temperature or under heating conditions to obtain the high antibacterial coating.

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