Antibacterial coating for vehicles and preparation method thereof
By preparing modified titanium dioxide and combining it with a grafting agent to form a three-dimensional antibacterial network layer, the problem of easy loss of antibacterial components in traditional vehicle chassis coatings is solved, thereby improving antibacterial and mechanical properties and extending the service life of the coating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-08
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional vehicle chassis protective coatings are insufficient in protecting against microbial erosion, and the antibacterial components are easily lost or unevenly dispersed, affecting the mechanical properties and anti-corrosion effect of the coating.
Hollow porous spherical titanium dioxide was prepared by hydrothermal synthesis, and active groups were introduced on its surface through hydroxylation and modification. Hyperbranched grafting agents were prepared by chemical reaction to form a dense three-dimensional antibacterial network layer, which was used as a composite antibacterial agent for antibacterial coatings for vehicles.
It improves antibacterial properties and dispersion properties of the coating, enhances the mechanical properties and corrosion resistance of the coating, and extends the service life of the coating.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of coating technology, specifically to an antibacterial coating for vehicles and its preparation method. Background Technology
[0002] As a critical component that directly contacts the road surface and withstands mechanical impacts and erosion from complex environments, the automotive chassis is constantly exposed to harsh environments characterized by moisture, mud, de-icing agents, and microbial growth. The attachment and reproduction of microorganisms (such as bacteria and mold) on the chassis surface not only causes biocorrosion and accelerates the aging of the metal substrate, but can also spread into the internal structure through chassis pores, affecting vehicle safety and service life. Traditional chassis protective coatings primarily focus on corrosion resistance, wear resistance, and impact resistance, but are significantly insufficient in protecting against microbial erosion. Conventional methods of adding antibacterial agents often involve physical blending, which results in the antibacterial components being easily lost, unevenly dispersed, and having poor durability, and may also impair the mechanical properties and anti-corrosion effects of the coating.
[0003] Therefore, the present invention provides an antibacterial coating for vehicles and a method for preparing the same, in order to solve the technical problems mentioned above. Summary of the Invention
[0004] The purpose of this invention is to provide an antibacterial coating for vehicles and its preparation method. The prepared antibacterial coating for vehicles not only has excellent antibacterial properties, but also excellent mechanical properties and corrosion resistance, effectively extending the service life of the coating while ensuring its quality.
[0005] To achieve the above objectives, the present invention provides the following technical solution: An antibacterial coating for vehicles includes component A and component B, wherein the mass ratio of component A to component B is 1:(0.5-0.8). Component A is composed of the following raw materials in parts by weight: 50-65 parts water-based epoxy emulsion, 8-15 parts composite antibacterial agent, 4-8 parts anti-flash rust agent, 2-4 parts nano zinc oxide, 5-10 parts talc powder, 4-6 parts aluminum tripolyphosphate, 0.3-0.8 parts wax powder, 1-1.5 parts propylene glycol alginate, 0.4-0.8 parts dispersant, 0.3-0.5 parts defoamer, 1-2 parts propylene glycol butyl ether, 0.8-1.5 parts leveling agent, and 30-40 parts water; Component B is composed of the following raw materials in parts by weight: 25-35 parts epoxy curing agent, 0.5-0.8 parts anti-flash rust agent, 2-3 parts silane coupling agent, 2-5 parts diisononyl cyclohexane-1,2-dicarboxylic acid and 10-20 parts water.
[0006] Furthermore, the preparation method of the composite antibacterial agent is as follows: Modified titanium dioxide is uniformly dispersed in N,N-dimethylformamide at a dosage ratio of 20-50 g / L. After mixing, 15-25% by mass of 2-methyl-5-isopropylphenol and 2.5-3.5% by mass of stannous octoate are added. The mixture is kept at 70-80℃ and stirred for 3-5 hours. Then, 30-50% by mass of grafting agent of modified titanium dioxide is added. The mixture is kept at 70-80℃ and stirred for 4-6 hours. The reaction solution is then filtered, washed, and vacuum dried to obtain the final product.
[0007] Furthermore, the grafting agent is prepared by the following method: Step 1: Under nitrogen protection, slowly add a methanol mixture of methyl acrylate (40-45% methyl acrylate) at a volume of 2-4 times to diethylenetriamine in an ice-water bath. After reacting at 20-30℃ for 5-8 hours, distill off and recover the methanol from the product component. React the remaining component under reduced pressure at 130-150℃ for 3-5 hours. The result is referred to as the intermediate. Step 2: While stirring, add 0.8-1.2 times the mass of the intermediate to the 0.1-0.2 g / mL intermediate aqueous solution, and react at 75-85℃ for 30-40 min. Then wash the reaction product alternately with ethanol and acetone 3-4 times.
[0008] Furthermore, the modified titanium dioxide is prepared by uniformly dispersing hydroxylated spherical titanium dioxide in an ethanol aqueous solution with a volume concentration of 85-90% at a dosage ratio of 50-80 g / L, adding 3-isocyanate-propyltrimethoxysilane at a mass ratio of 0.8-1.2 times that of the hydroxylated spherical titanium dioxide, and reacting at 60-70℃ for 5-8 h; then filtering, washing and vacuum drying are performed to obtain the modified titanium dioxide.
[0009] Furthermore, the preparation method of the hydroxylated spherical titanium dioxide is as follows: the spherical titanium dioxide is added to hydrogen peroxide with a mass of 15-20 times its weight and a concentration of 25-30 wt%, and reacted at 80-85℃ for 4-6 hours; then, after filtration, washing and vacuum drying, the hydroxylated spherical titanium dioxide is obtained.
[0010] Furthermore, the method for preparing the spherical titanium dioxide is as follows: Tween 80, hexadecyltrimethylammonium chloride, carbomer, and deionized water are mixed in a mass ratio of 0.3-0.5:0.6-1:1:60-80, and then an ethyl acetate solution of tetraisopropyl titanate is added. The resulting mixture is first emulsified at a speed of 10000-15000 r / min for 2-5 min, then stirred at a speed of 1000-1200 r / min for 40-60 min, and then centrifuged at a speed of 3000-5000 r / min for 10-15 min. Finally, it is washed with deionized water, dried, and calcined to obtain the product. The mass ratio of tetraisopropyl titanate to surfactant in the mixture is 20-50:1.
[0011] Furthermore, the dispersant is selected from any one of Dow 731A, BYK-155, BYK-190, and BYK-192.
[0012] Furthermore, the defoamer is selected from any one of Dow Corning AFE-3168, TEGO-8030, TEGO-810, and BYK-A530.
[0013] Furthermore, the leveling agent is selected from any one of BYK-331, BYK-333, BYK-378, and BASF EFKAFL 3772.
[0014] A method for preparing an antibacterial coating for vehicles includes the following steps: Step 1: According to the weight ratio of component A, add the raw materials except for water-based epoxy emulsion, defoamer, leveling agent and propylene glycol alginate to water in sequence, mix and stir evenly, then add the remaining raw materials of component A, mix and stir evenly to obtain component A; Step 2: According to the weight ratio of component B, add the raw materials other than the epoxy curing agent to the water, mix and stir evenly, then add the epoxy curing agent and mix evenly to obtain component B. The third step is to mix component A and component B according to the weight ratio and stir until they are evenly mixed to obtain the antibacterial coating for vehicles.
[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes Tween 80, hexadecyltrimethylammonium chloride, carbomer, tetraisopropyl titanate, and ethyl acetate as raw materials to prepare spherical titanium dioxide with a hollow, porous structure via hydrothermal synthesis. The titanium dioxide is then hydroxylated using hydrogen peroxide, followed by modification with 3-isocyanate-propyltrimethoxysilane to introduce active groups onto its surface, resulting in modified titanium dioxide. The modified titanium dioxide exhibits a large number of active groups on its surface and within the inner walls of its internal cavities, facilitating the subsequent preparation of composite antibacterial agents.
[0016] Furthermore, this invention uses diethylenetriamine, methyl acrylate, and other raw materials to prepare intermediates through a chemical reaction. The obtained intermediates are then dissolved in water, and 2,3-epoxypropyltrimethylammonium chloride is added. Following a chemical reaction, a grafting agent with a hyperbranched macromolecular structure is prepared. The prepared grafting agent not only possesses a relatively large branched structure, but its molecular chain also contains quaternary ammonium salt structures, and the ends of the molecular chains contain highly reactive amino groups.
[0017] Modified titanium dioxide was dispersed in N,N-dimethylformamide and 2-methyl-5-isopropylphenol was added. Under the action of stannous octoate, the active groups carried by the modified titanium dioxide reacted and bonded with the hydroxyl groups on the 2-methyl-5-isopropylphenol molecule, allowing 2-methyl-5-isopropylphenol to be firmly "grafted" onto the surface and inner walls of the modified titanium dioxide. Then, it was reacted with a grafting agent. The amino groups on the grafting agent molecular chain were "installed" on the surface and interior of the modified titanium dioxide through chemical bonds, introducing quaternary ammonium salt cationic groups with excellent antibacterial properties. Finally, a dense three-dimensional antibacterial network layer composed of 2-methyl-5-isopropylphenol and the grafting agent was formed on the interior and outer surface of the modified titanium dioxide. This resulted in a composite antibacterial agent with excellent antibacterial properties, which can significantly improve the antibacterial performance when used as a raw material for antibacterial coatings for vehicles. Furthermore, because organic macromolecules—grafting agents—are grafted onto the surface of titanium oxide, it not only exhibits excellent dispersibility in coating systems and reduces the agglomeration of titanium oxide, but also improves the mechanical properties and corrosion resistance of the coating to a certain extent, further ensuring the quality of the coating. Detailed Implementation
[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0019] In the following examples and comparative examples, the water-based epoxy emulsion used is a bisphenol A type epoxy resin emulsion with a solid content of 40-50%; the epoxy curing agent used is water-based epoxy curing agent WG-528; the flash rust inhibitor used is ZT-709 flash rust inhibitor produced by Beijing Zhitu Chemical Co., Ltd.; the silane coupling agent used is silane coupling agent KH-560; and the talc powder has a particle size of 800-1000 mesh. Example 1:
[0020] An antibacterial coating for vehicles includes component A and component B, wherein the mass ratio of component A to component B is 1:0.5. Component A consists of the following raw materials in parts by weight: 50 parts water-based epoxy emulsion, 8 parts composite antibacterial agent, 4 parts anti-flash rust agent, 2 parts nano zinc oxide, 5 parts talc powder with a particle size of 800 mesh, 4 parts aluminum tripolyphosphate, 0.3 parts wax powder, 1 part propylene glycol alginate, 0.4 parts Dow 731A dispersant, 0.3 parts Dow Corning AFE-3168 defoamer, 1 part propylene glycol butyl ether, 0.8 parts BYK-331 leveling agent, and 30 parts water; Component B consists of the following raw materials in parts by weight: 25 parts epoxy curing agent, 0.5 parts anti-flash rust agent, 2 parts silane coupling agent, 2 parts diisononyl cyclohexane-1,2-dicarboxylic acid and 10 parts water.
[0021] The preparation method of the composite antibacterial agent is as follows: Modified titanium dioxide is uniformly dispersed in N,N-dimethylformamide at a dosage ratio of 20 g / L. After mixing, 15% by mass of 2-methyl-5-isopropylphenol and 2.5% by mass of stannous octoate are added. The mixture is kept at 70°C and stirred for 5 h. Then, 30% by mass of grafting agent of modified titanium dioxide is added. The mixture is kept at 70°C and stirred for 4 h. The reaction solution is filtered, washed and vacuum dried to obtain the final product.
[0022] The grafting agent is prepared by the following method: Step 1: Under nitrogen protection, slowly add a methanol mixture with a volume of 40% methyl acrylate (twice the volume of diethylenetriamine) to diethylenetriamine in an ice-water bath. After reacting at 20°C for 8 hours, distill off and recover the methanol from the product component. The remaining component is then reacted under reduced pressure at 130°C for 5 hours. The result is referred to as the intermediate. Step 2: While stirring, add 2,3-epoxypropyltrimethylammonium chloride (0.8 times the mass of the intermediate) to the 0.1 g / mL intermediate aqueous solution. After reacting at 75°C for 40 min, wash the reaction product three times alternately with ethanol and acetone.
[0023] The modified titanium dioxide is prepared by uniformly dispersing hydroxylated spherical titanium dioxide in an 85% (v / L) aqueous ethanol solution at a dosage ratio of 50 g / L, adding 3-isocyanate-propyltrimethoxysilane at a mass ratio of 0.8 times that of the hydroxylated spherical titanium dioxide, and reacting at 60°C for 8 h; then filtering, washing and vacuum drying are performed to obtain the modified titanium dioxide.
[0024] The preparation method of hydroxylated spherical titanium dioxide is as follows: spherical titanium dioxide is added to hydrogen peroxide with a mass of 15 times its weight and a concentration of 25 wt%, and reacted at 80℃ for 6 h; then filtered, washed and vacuum dried to obtain hydroxylated spherical titanium dioxide.
[0025] The preparation method of spherical titanium dioxide is as follows: Tween 80, hexadecyltrimethylammonium chloride, carbomer and deionized water are mixed in a mass ratio of 0.3:0.6:1:60, and then an ethyl acetate solution of tetraisopropyl titanate is added. The resulting mixture is first emulsified at 10000 r / min for 5 min, then stirred at 1000 r / min for 60 min, and then centrifuged at 3000 r / min for 15 min. Finally, it is washed with deionized water, dried and calcined to obtain the product. The mass ratio of tetraisopropyl titanate to surfactant in the mixture is 20:1.
[0026] A method for preparing an antibacterial coating for vehicles includes the following steps: Step 1: According to the weight ratio of component A, add the raw materials except for water-based epoxy emulsion, defoamer, leveling agent and propylene glycol alginate to water in sequence, mix and stir evenly, then add the remaining raw materials of component A, mix and stir evenly to obtain component A; Step 2: According to the weight ratio of component B, add the raw materials other than the epoxy curing agent to the water, mix and stir evenly, then add the epoxy curing agent and mix evenly to obtain component B. The third step is to mix component A and component B according to the weight ratio and stir until they are evenly mixed to obtain the antibacterial coating for vehicles. Example 2:
[0027] The preparation method of the antibacterial coating for vehicles provided in this embodiment is basically the same as that in Embodiment 1, except that the specific proportions of the raw materials used in the antibacterial coating for vehicles and the preparation method of the composite antibacterial agent are different in this embodiment. The specific proportions of the raw materials used in the antibacterial coating for vehicles and the preparation method of the composite antibacterial agent in this embodiment are as follows: An antibacterial coating for vehicles includes component A and component B, wherein the mass ratio of component A to component B is 1:0.6. Component A consists of the following raw materials in parts by weight: 60 parts water-based epoxy emulsion, 10 parts composite antibacterial agent, 5 parts anti-flash rust agent, 3 parts nano zinc oxide, 8 parts talc powder with a particle size of 900 mesh, 5 parts aluminum tripolyphosphate, 0.5 parts wax powder, 1.2 parts propylene glycol alginate, 0.6 parts BYK-155 dispersant, 0.4 parts TEGO-8030 defoamer, 1.5 parts propylene glycol butyl ether, 1 part BYK-333 leveling agent, and 35 parts water; Component B consists of the following raw materials in parts by weight: 30 parts epoxy curing agent, 0.6 parts flash rust inhibitor, 2.5 parts silane coupling agent, 3 parts diisononyl cyclohexane-1,2-dicarboxylic acid and 15 parts water.
[0028] The preparation method of the composite antibacterial agent is as follows: Modified titanium dioxide is uniformly dispersed in N,N-dimethylformamide at a dosage ratio of 40 g / L. After mixing, 2-methyl-5-isopropylphenol and 3% stannous octoate are added at a mass ratio of 20% of the modified titanium dioxide. After stirring and reacting at 75°C for 4 hours, grafting agent at a mass ratio of 40% of the modified titanium dioxide is added. The reaction is continued to be stirred and reacted for another 5 hours. The reaction solution is then filtered, washed, and vacuum dried to obtain the final product.
[0029] The grafting agent is prepared by the following method: Step 1: Under nitrogen protection, slowly add a methanol mixture with a volume of 3 times that of diethylenetriamine and a volume concentration of 40% methyl acrylate to diethylenetriamine in an ice-water bath environment. After reacting at 25°C for 6 hours, distill off and recover the methanol from the product component. The remaining component is reacted under reduced pressure at 140°C for 4 hours. The result is referred to as the intermediate. Step 2: While stirring, add an equal mass of 2,3-epoxypropyltrimethylammonium chloride to the 0.1 g / mL intermediate aqueous solution. After reacting at 80 °C for 35 min, wash the reaction product alternately with ethanol and acetone 4 times.
[0030] The modified titanium dioxide is prepared by uniformly dispersing hydroxylated spherical titanium dioxide in an 85% (v / L) aqueous ethanol solution at a dosage ratio of 60 g / L, adding 3-isocyanate-propyltrimethoxysilane of equal mass to the hydroxylated spherical titanium dioxide, and reacting at 65°C for 6 h; then filtering, washing and vacuum drying are performed to obtain the modified titanium dioxide.
[0031] The preparation method of hydroxylated spherical titanium dioxide is as follows: spherical titanium dioxide is added to hydrogen peroxide with a mass of 15 times its weight and a concentration of 25 wt%, and reacted at 80℃ for 5 h; then filtered, washed and vacuum dried to obtain hydroxylated spherical titanium dioxide.
[0032] The preparation method of spherical titanium dioxide is as follows: Tween 80, hexadecyltrimethylammonium chloride, carbomer and deionized water are mixed in a mass ratio of 0.4:0.8:1:70, and then an ethyl acetate solution of tetraisopropyl titanate is added. The resulting mixture is first emulsified at 12000 r / min for 3 min, then stirred at 1000 r / min for 50 min, and then centrifuged at 4000 r / min for 15 min. Finally, it is washed with deionized water, dried and calcined to obtain the product. The mass ratio of tetraisopropyl titanate to surfactant in the mixture is 40:1. Example 3:
[0033] The preparation method of the antibacterial coating for vehicles provided in this embodiment is basically the same as that in Embodiment 1, except that the specific proportions of the raw materials used in the antibacterial coating for vehicles and the preparation method of the composite antibacterial agent are different in this embodiment. The specific proportions of the raw materials used in the antibacterial coating for vehicles and the preparation method of the composite antibacterial agent in this embodiment are as follows: An antibacterial coating for vehicles includes component A and component B, wherein the mass ratio of component A to component B is 1:0.8. Component A consists of the following raw materials in parts by weight: 65 parts water-based epoxy emulsion, 15 parts composite antibacterial agent, 8 parts anti-flash rust agent, 4 parts nano zinc oxide, 10 parts talc powder with a particle size of 1000 mesh, 6 parts aluminum tripolyphosphate, 0.8 parts wax powder, 1.5 parts propylene glycol alginate, 0.8 parts BYK-190 dispersant, 0.5 parts TEGO-810 defoamer, 2 parts propylene glycol butyl ether, 1.5 parts BYK-378 leveling agent, and 40 parts water; Component B consists of the following raw materials in parts by weight: 35 parts epoxy curing agent, 0.8 parts flash rust inhibitor, 3 parts silane coupling agent, 5 parts diisononyl cyclohexane-1,2-dicarboxylic acid and 20 parts water.
[0034] The preparation method of the composite antibacterial agent is as follows: Modified titanium dioxide is uniformly dispersed in N,N-dimethylformamide at a dosage ratio of 50 g / L. After mixing, 2-methyl-5-isopropylphenol and 3.5% stannous octoate are added by mass, respectively. The mixture is kept at 80℃ and stirred for 3 h. Then, grafting agent with mass of 50% of modified titanium dioxide is added. The mixture is kept at 80℃ and stirred for 6 h. The reaction solution is filtered, washed and vacuum dried to obtain the final product.
[0035] The grafting agent is prepared by the following method: Step 1: Under nitrogen protection, slowly add a methanol mixture with a volume of 4 times that of diethylenetriamine and a volume concentration of 45% methyl acrylate to diethylenetriamine in an ice-water bath. After reacting at 30°C for 5 hours, distill off and recover the methanol from the product component. The remaining component is reacted under reduced pressure at 150°C for 3 hours. The result is referred to as the intermediate. Step 2: While stirring, add 2,3-epoxypropyltrimethylammonium chloride (1.2 times the mass of the intermediate) to the 0.2 g / mL intermediate aqueous solution. After reacting at 85°C for 30 min, wash the reaction product alternately with ethanol and acetone 4 times.
[0036] The modified titanium dioxide is prepared by uniformly dispersing hydroxylated spherical titanium dioxide in an ethanol aqueous solution with a volume concentration of 90% at a dosage ratio of 80 g / L, adding 3-isocyanate-propyltrimethoxysilane at a mass ratio of 1.2 times that of the hydroxylated spherical titanium dioxide, and reacting at 70℃ for 5 h; then filtering, washing and vacuum drying are performed to obtain the modified titanium dioxide.
[0037] The preparation method of hydroxylated spherical titanium dioxide is as follows: spherical titanium dioxide is added to hydrogen peroxide with a mass of 20 times its weight and a concentration of 30 wt%, and reacted at 85°C for 4 h; then, after filtration, washing and vacuum drying, hydroxylated spherical titanium dioxide is obtained.
[0038] The preparation method of spherical titanium dioxide is as follows: Tween 80, hexadecyltrimethylammonium chloride, carbomer and deionized water are mixed in a mass ratio of 0.5:1:1:80, and then an ethyl acetate solution of tetraisopropyl titanate is added. The resulting mixture is first emulsified at 15000 r / min for 2 min, then stirred at 1200 r / min for 40 min, and then centrifuged at 5000 r / min for 10 min. Finally, it is washed with deionized water, dried and calcined to obtain the final product. The mass ratio of tetraisopropyl titanate to surfactant in the mixture is 50:1.
[0039] Comparative Example 1: The difference from Example 1 is that an equal amount of spherical titanium dioxide is used instead of the composite antibacterial agent in this comparative example.
[0040] Comparative Example 2: The difference from Example 1 is that the spherical titanium dioxide was not hydroxylated during the preparation of the composite antibacterial agent in this comparative example. That is, the preparation process of hydroxylated spherical titanium dioxide is not included in this comparative example. Modified titanium dioxide is prepared directly from spherical titanium dioxide as raw material.
[0041] Comparative Example 3: The difference from Example 1 is that 2-methyl-5-isopropylphenol was not used in the preparation of the composite antibacterial agent in this comparative example.
[0042] Comparative Example 4: The difference from Example 1 is that no grafting agent was used in the preparation of the composite antibacterial agent in this comparative example.
[0043] Performance testing: The antibacterial coating samples for vehicles prepared in Examples 1-3 and Comparative Examples 1-4 were coated onto automobile chassis parts, with a coating thickness of 35±5μm. After drying under the same conditions, the surface film properties of the treated coatings were tested as follows, and the test results are recorded in the table below: I. Mechanical property testing 1. Fracture toughness: The fracture toughness of the samples was tested using a computer-controlled universal testing machine (208B-TS, WANCE). The test mode was a three-point bending mode, using a 6mm diameter ballast head, a span of 8 times the thickness, and a loading rate of 10mm / min. At least 5 specimens of each type were tested, and the average value was taken. The test results are recorded in Table 1.
[0044] 2. Impact Resistance: The impact resistance of the samples was tested using a pendulum impact testing machine (DAS4000, SYSTEM). The pendulum impact energy was selected as 2.75J, and a notched back impact was used. The specimen was treated as a vertical cantilever beam and was destroyed during the pendulum swing. Ten specimens of each type were tested, and the average value was taken. The test results are recorded in Table 1.
[0045] II. Corrosion Resistance Test 1. Salt water resistance: Five samples were taken from the automotive chassis parts coated with antibacterial paint. The time required for complete corrosion under the condition of 20wt% NaCl aqueous solution was calculated. The average value of the results was taken and the test results were recorded in Table 1.
[0046] 2. Acid resistance: Five samples were taken from the automotive chassis parts coated with antibacterial coating, and the time required for complete corrosion under 50wt% concentrated sulfuric acid was calculated. The average value of the results was taken, and the test results were recorded in Table 1.
[0047] 3. Alkali resistance: Five samples were taken from the automotive chassis parts coated with antibacterial paint, and the time required for complete corrosion under the condition of 10wt% NaOH aqueous solution was calculated. The average value of the results was taken, and the test results were recorded in Table 1.
[0048] III. Antibacterial Performance Test The inhibition rates of each group of antibacterial coating samples against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Aspergillus niger were tested according to the GB / T2591-2003 standard, and the test results are recorded in Table 2.
[0049] Table 1
[0050] Table 2
[0051] By comparing and analyzing the relevant data in Tables 1 and 2, it can be seen that the automotive antibacterial coating prepared by this invention not only has excellent antibacterial properties, but also excellent mechanical properties and corrosion resistance, effectively extending the service life of the coating while ensuring its quality. This indicates that the automotive antibacterial coating and its preparation method provided by this invention have a broader market prospect and are more suitable for widespread application.
[0052] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0053] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. An antibacterial coating for vehicles, characterized in that, It includes component A and component B, and the mass ratio of component A to component B is 1:(0.5-0.8). Component A is composed of the following raw materials in parts by weight: 50-65 parts water-based epoxy emulsion, 8-15 parts composite antibacterial agent, 4-8 parts anti-flash rust agent, 2-4 parts nano zinc oxide, 5-10 parts talc powder, 4-6 parts aluminum tripolyphosphate, 0.3-0.8 parts wax powder, 1-1.5 parts propylene glycol alginate, 0.4-0.8 parts dispersant, 0.3-0.5 parts defoamer, 1-2 parts propylene glycol butyl ether, 0.8-1.5 parts leveling agent, and 30-40 parts water; Component B is composed of the following raw materials in parts by weight: 25-35 parts epoxy curing agent, 0.5-0.8 parts anti-flash rust agent, 2-3 parts silane coupling agent, 2-5 parts diisononyl cyclohexane-1,2-dicarboxylic acid and 10-20 parts water.
2. The antibacterial coating for vehicles according to claim 1, characterized in that, The preparation method of the composite antibacterial agent is as follows: Modified titanium dioxide is uniformly dispersed in N,N-dimethylformamide at a dosage ratio of 20-50 g / L. After mixing, 15-25% by mass of 2-methyl-5-isopropylphenol and 2.5-3.5% by mass of stannous octoate are added. The mixture is kept at 70-80℃ and stirred for 3-5 h. Then, 30-50% by mass of grafting agent of modified titanium dioxide is added. The mixture is kept at 70-80℃ and stirred for 4-6 h. The reaction solution is filtered, washed and vacuum dried to obtain the final product.
3. The antibacterial coating for vehicles according to claim 2, characterized in that, The grafting agent is prepared by the following method: Step 1: Under nitrogen protection, slowly add a methanol mixture of methyl acrylate (40-45% methyl acrylate) at a volume of 2-4 times to diethylenetriamine in an ice-water bath. After reacting at 20-30℃ for 5-8 hours, distill off and recover the methanol from the product component. React the remaining component under reduced pressure at 130-150℃ for 3-5 hours. The result is referred to as the intermediate. Step 2: While stirring, add 0.8-1.2 times the mass of the intermediate to the 0.1-0.2 g / mL intermediate aqueous solution, and react at 75-85℃ for 30-40 min. Then wash the reaction product alternately with ethanol and acetone 3-4 times.
4. The antibacterial coating for vehicles according to claim 2, characterized in that, The modified titanium dioxide is prepared by uniformly dispersing hydroxylated spherical titanium dioxide in an ethanol aqueous solution with a volume concentration of 85-90% at a dosage ratio of 50-80 g / L, adding 3-isocyanate-propyltrimethoxysilane at a mass ratio of 0.8-1.2 times that of the hydroxylated spherical titanium dioxide, and reacting at 60-70℃ for 5-8 h; then filtering, washing and vacuum drying are performed to obtain the modified titanium dioxide.
5. The antibacterial coating for vehicles according to claim 4, characterized in that, The method for preparing the hydroxylated spherical titanium dioxide is as follows: the spherical titanium dioxide is added to hydrogen peroxide with a mass of 15-20 times its weight and a concentration of 25-30 wt%, and reacted at 80-85℃ for 4-6 hours; then, after filtration, washing and vacuum drying, the hydroxylated spherical titanium dioxide is obtained.
6. The antibacterial coating for vehicles according to claim 5, characterized in that, The method for preparing the spherical titanium dioxide is as follows: Tween 80, hexadecyltrimethylammonium chloride, carbomer, and deionized water are mixed in a mass ratio of 0.3-0.5:0.6-1:1:60-80, and then an ethyl acetate solution of tetraisopropyl titanate is added. The resulting mixture is first emulsified at a speed of 10000-15000 r / min for 2-5 min, then stirred at a speed of 1000-1200 r / min for 40-60 min, and then centrifuged at a speed of 3000-5000 r / min for 10-15 min. Finally, it is washed with deionized water, dried, and calcined to obtain the product. The mass ratio of tetraisopropyl titanate to surfactant in the mixture is 20-50:
1.
7. The antibacterial coating for vehicles according to claim 1, characterized in that: The dispersant is selected from any one of Dow 731A, BYK-155, BYK-190, and BYK-192.
8. The antibacterial coating for vehicles according to claim 1, characterized in that: The defoamer is selected from any one of Dow Corning AFE-3168, TEGO-8030, TEGO-810, and BYK-A530.
9. The antibacterial coating for vehicles according to claim 1, characterized in that: The leveling agent is selected from any one of BYK-331, BYK-333, BYK-378, and BASF EFKAFL 3772.
10. A method for preparing an antibacterial coating for vehicles according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: According to the weight ratio of component A, add the raw materials except for water-based epoxy emulsion, defoamer, leveling agent and propylene glycol alginate to water in sequence, mix and stir evenly, then add the remaining raw materials of component A, mix and stir evenly to obtain component A; Step 2: According to the weight ratio of component B, add the raw materials other than the epoxy curing agent to the water, mix and stir evenly, then add the epoxy curing agent and mix evenly to obtain component B. The third step is to mix component A and component B according to the weight ratio and stir until they are evenly mixed to obtain the antibacterial coating for vehicles.