Antifouling paint for inhibiting microbial growth, electrical equipment, preparation method and application

Abstract

The invention belongs to the technical field of coatings, and particularly relates to an antifouling coating for inhibiting microbial growth, electrical equipment, a preparation method and application. The invention provides an antifouling coating for inhibiting microbial growth. By adding film-forming substances such as polyphenyl ether and antibacterial agent components such as a silver phosphate antibacterial agent, a coating formed after the coating is cured has hydrophobic and long-acting antibacterial properties at the same time, and microbial contamination can be prevented for a long time; components such as trifluorochlorosilane modified polyphenyl ether, nano silicon dioxide and the like, and components such as a nano copper oxide antibacterial agent and the like are introduced into the coating, so that a super-hydrophobic long-acting antibacterial protective layer can be formed for electrical equipment; the technical problem that existing hydrophobic coatings are difficult to prevent microbial contamination for a long time is solved.

Description

Technical Field

[0001] This application belongs to the technical field of coatings, and particularly relates to an antifouling coating for inhibiting microbial growth, an electrical device, a preparation method and an application thereof. Background Art

[0002] Microbial contamination has attracted wide attention globally. Due to its excellent self-cleaning performance, anti-pollution ability and broad application prospects, superhydrophobic coatings have gradually become an important research direction in the field of coating technology; superhydrophobic coatings achieve high contact angles (>150°) and low rolling angles of water droplets by constructing surface rough micro-nano structures and reducing surface energy, thereby effectively reducing the contact area between water droplets and the surface, and the surface is not easily wetted. This characteristic makes it show great application potential in anti-fouling, anti-corrosion, self-cleaning, etc.

[0003] For electrical devices such as insulators, insulating bushings, equipment bases, lightning arresters, etc., the wet environment after the surface is wetted provides favorable conditions for the parasitism, attachment, growth and reproduction of microorganisms such as green algae and molds. Microbial contamination on the surface of electrical devices will accelerate the aging of electrical devices, reduce the insulation strength, and increase the risk of flashover accidents. Although the attachment and parasitism of microorganisms can be removed and microbial contamination can be reduced by two methods: live water cleaning and manual cleaning during power outage, the problem of microbial contamination cannot be fundamentally solved; if a superhydrophobic protective layer can be formed by means of superhydrophobic coatings, making the surface of electrical devices not easily wetted and changing the wet environment on the surface of electrical devices, it is expected to fundamentally inhibit the parasitism, attachment, growth and reproduction of microorganisms, reduce the workload of cleaning and maintenance of electrical devices, and improve the safety and stability of electrical devices during long-term operation.

[0004] Although forming a superhydrophobic protective layer on the surface of substrates such as electrical devices can reduce the parasitism, attachment, growth and reproduction of microorganisms, the superhydrophobic protective layer is difficult to exert a bactericidal and antibacterial effect, and microorganisms may still grow and reproduce on the surface of electrical devices, which is not conducive to the long-term operation of electrical devices; in the field of antibacterial, silver ion antibacterial materials have attracted much attention due to their broad-spectrum and high-efficiency antibacterial properties. This is because silver ions can bind to proteins on the cell wall or cell membrane of microorganisms, disrupt the metabolic function of microorganisms, and then inhibit their growth. Now silver ion antibacterial materials have begun to be applied in superhydrophobic coatings; however, the silver ion antibacterial materials currently applied in superhydrophobic coatings are mainly silver nitrate antibacterial materials. Silver nitrate antibacterial materials have good solubility, and silver ions are easily lost in practical applications, resulting in a relatively fast decline in antibacterial effect and being difficult to meet the protection requirements during the long-term operation of electrical devices; therefore, the current superhydrophobic coatings are relatively weak in long-term antibacterial performance and cannot meet the microbial protection requirements of some long-term operating electrical devices. Summary of the Invention

[0005] In view of this, the present application provides an antifouling coating for inhibiting microbial growth, an electrical device, a preparation method and an application thereof, which are used to solve the technical problem that existing hydrophobic coatings are difficult to prevent microbial contamination for a long time.

[0006] In a first aspect of the present application, an antifouling coating for inhibiting microbial growth, the raw materials include: a hydrophobic film-forming substance, an initiator, and a silver phosphate antibacterial agent.

[0007] Preferably, the hydrophobic film-forming substance includes: trifluorochlorosilane-modified polyphenylene ether, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, and vinyltrimethoxysilane.

[0008] Preferably, the initiator is selected from at least one of benzoyl peroxide, di-tert-butyl peroxide, and azobisisobutyronitrile.

[0009] Preferably, the antifouling coating for inhibiting microbial growth further includes: a nano-copper oxide antibacterial agent.

[0010] Preferably, the particle size of the nano-copper oxide antibacterial agent is 40-60 nm.

[0011] Preferably, the antifouling coating for inhibiting microbial growth further includes: nano-silica.

[0012] Preferably, the particle size of the nano-silica is 15-25 nm.

[0013] Preferably, the antifouling coating for inhibiting microbial growth further includes: an organic solvent.

[0014] Preferably, the organic solvent is selected from at least one of chloroform, carbon tetrachloride, dichloromethane, tetrahydrofuran, and dimethylformamide.

[0015] In a second aspect of the present application, an antifouling coating for inhibiting microbial growth is provided, which can be used to prepare the antifouling coating for inhibiting microbial growth described in the first aspect, and includes the following steps:

[0016] Step S1: Drop ammonia water into chloroform, an organic solvent in which hydroxy-terminated polyphenylene ether and trifluorochlorosilane are dissolved, for reaction to obtain a solution in which trifluorochlorosilane-modified polyphenylene ether is dissolved;

[0017] Step S2: Add the organic solvent acetone to the solution in which trifluorochlorosilane-modified polyphenylene ether is dissolved to completely precipitate the trifluorochlorosilane-modified polyphenylene ether, and collect the precipitate to obtain trifluorochlorosilane-modified polyphenylene ether;

[0018] Step S3: Mix trifluorochlorosilane-modified polyphenylene ether, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, vinyltrimethoxysilane, initiator, silver phosphate antibacterial agent, nano-copper oxide antibacterial agent, nano-silica, and organic solvent uniformly to obtain an antifouling coating that inhibits the growth of microorganisms.

[0019] Preferably, in step S1, the chloroform of the organic solvent dissolving hydroxyl-terminated polyphenylene ether and trifluorochlorosilane includes: 30 - 60 parts by mass of hydroxyl-terminated polyphenylene ether, 5 - 10 parts by mass of trifluorochlorosilane, and 30 - 60 parts by mass of organic solvent chloroform;

[0020] In step S3, the antifouling coating that inhibits the growth of microorganisms includes: 5 - 15 parts by mass of trifluorochlorosilane-modified polyphenylene ether, 2 - 4 parts by mass of perfluoroalkyl ethyl acrylate, 0.5 - 1.5 parts by mass of glycidyl methacrylate, 0.5 - 1.5 parts by mass of vinyltrimethoxysilane, 0.2 - 1 part by mass of initiator, 0.5 - 1.5 parts by mass of silver phosphate antibacterial agent, 0.5 - 1.5 parts by mass of nano-copper oxide antibacterial agent, 6 - 12 parts by mass of nano-silica, and 30 - 60 parts by mass of organic solvent.

[0021] The third aspect of the present application provides the application of the above-mentioned antifouling coating that inhibits the growth of microorganisms in the field of electrical equipment protection.

[0022] The fourth aspect provides an antifouling electrical equipment that inhibits the growth of microorganisms, including an electrical equipment and an antifouling coating that inhibits the growth of microorganisms;

[0023] The antifouling coating that inhibits the growth of microorganisms is formed by curing the antifouling coating that inhibits the growth of microorganisms described in the first aspect on the surface of the electrical equipment.

[0024] Preferably, the electrical equipment is selected from at least one of insulators, insulating bushings, equipment bases, and lightning arresters.

[0025] Compared with the prior art, the antifouling coating that inhibits the growth of microorganisms provided by the present application has at least the following beneficial effects:

[0026] 1. For the antifouling coating that inhibits the growth of microorganisms provided by the present application, after the coating forms a hydrophobic coating, since the introduced antibacterial agent is silver phosphate with low solubility, it can release silver ions for a long time, making the cured coating of the coating have better long-term antibacterial performance, and can provide a hydrophobic antibacterial protection layer for some electrical equipment that needs to operate for a long time to prevent microbial contamination.

[0027] 2. The antifouling coating provided by this application for inhibiting the growth of microorganisms significantly reduces the surface energy of the coating due to the modification of polyphenylene ether in the film-forming substance with trichlorosilane, and cooperates with the rough surface micro-nano structure formed by adding nano-silica. The two hydrophobic modification mechanisms work synergistically, making the water contact angle of the coating exceed 150 o , providing a superhydrophobic protective layer for substrates such as electrical equipment and helping the electrical equipment prevent microbial contamination.

[0028] 3. The antifouling coating provided by this application for inhibiting the growth of microorganisms also introduces nano-copper oxide used for generating ROS reactive oxygen to degrade organic pollutants in the field of environmental governance for antibacterial purposes. The mechanism of nano-copper oxide generating ROS reactive oxygen to kill microorganisms and the mechanism of silver ions contacting microorganisms to destroy their metabolic functions and kill microorganisms work synergistically, and a coating with extremely strong inhibition of microbial growth can be formed on the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flowchart of the preparation method of an antifouling coating for inhibiting the growth of microorganisms provided in Embodiment 1 of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] This application provides an antifouling coating for inhibiting the growth of microorganisms, an electrical equipment, and a preparation method and application thereof, which are used to solve the technical problem that existing hydrophobic coatings are difficult to prevent microbial contamination for a long time.

[0032] The following will clearly and completely describe the technical solutions of this application with reference to the drawings. Obviously, the described embodiments are some embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0033] In view of the high solubility of silver nitrate antibacterial agents currently used in hydrophobic coatings, which makes it difficult for hydrophobic coatings to prevent microbial contamination in the long term and the defect of the low performance of existing hydrophobic coatings; the technical solution of this application provides an antifouling coating that inhibits the growth of microorganisms, and the raw material composition includes: a hydrophobic film-forming substance, an initiator, and a silver phosphate antibacterial agent; the hydrophobic film-forming substance introduced into the coating can be polymerized under the action of free radicals generated by the initiator to form a continuous and uniform hydrophobic coating, preventing the parasitism, attachment, growth, and reproduction of microorganisms, and introducing a silver phosphate antibacterial agent as an antibacterial agent that generates silver ions. The solubility of silver phosphate is extremely low, with a solubility of around 0.0002 g / 100 mL at room temperature, which is much lower than the solubility of silver nitrate, which is as high as 256 g / 100 mL. This makes the release rate of silver ions low after the silver phosphate antibacterial agent is added to the coating, and it can release silver ions for a long time to exert an antibacterial effect, enabling the coating to have better long-term antibacterial performance, and being able to provide long-term protection for some equipment that needs to operate for a long time, such as electrical equipment like insulators, insulating bushings, equipment bases, lightning protection wires, etc., preventing microbial contamination for a long time, and overcoming the defect that existing hydrophobic coatings are difficult to prevent microbial contamination in the long term.

[0034] As a preferred technical solution, the hydrophobic film-forming substances of an antifouling coating that inhibits the growth of microorganisms provided by this application include components such as trifluorochlorosilane-modified polyphenylene ether, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, vinyltrimethoxysilane, etc. These hydrophobic film-forming substances are polymerized under the action of free radicals generated by the initiator to form a hydrophobic coating; among them, trifluorochlorosilane-modified polyphenylene ether is a resin material containing a rigid benzene ring group, with good mechanical strength, dimensional stability, heat resistance, and electrical properties. The benzene ring is also a hydrophobic group, which makes polyphenylene ether very suitable as a hydrophobic film-forming substance for hydrophobic coatings for the microbial protection of electrical equipment; and trifluorochlorosilane-modified polyphenylene ether is polyphenylene ether modified by trifluorochlorosilane. Trifluorochlorosilane contains multiple C-F bonds, which can significantly reduce the surface energy of the coating after curing.

[0035] On the basis of using film-forming substances such as trifluorochlorosilane-modified polyphenylene ether, nano-silica is also introduced into an antifouling coating that inhibits the growth of microorganisms provided by this application; the introduced nano-silica can construct a rough surface micro-nano structure on the surface of the coating after curing. When a water droplet contacts this rough surface, it will preferentially contact the convex part, and an air layer will be formed in the depression, which reduces the actual contact area between the liquid and the solid surface, improves the hydrophobic performance of the coating after curing, and this improvement in the hydrophobic performance of the coating belongs to the improvement of the physical structure, which is different from the mechanism of changing the surface energy of the coating by film-forming substances such as trifluorochlorosilane-modified polyphenylene ether. The two hydrophobic improvement mechanisms can cooperate with each other, and significantly improve the hydrophobicity of the coating after curing through two ways, making the water contact angle of the coating exceed 150 o, to provide a superhydrophobic protective layer for substrates such as electrical equipment, and help electrical equipment prevent microbial contamination.

[0036] As a preferred technical solution, a nano-copper oxide antibacterial agent is further introduced into the antifouling coating for inhibiting microbial growth provided by this application; the introduced nano-copper oxide antibacterial agent is a material with good antibacterial and chemical stability. In the field of environmental governance, nano-copper oxide is often used to degrade organic pollutants by generating ROS reactive oxygen under photocatalysis. At the same time, the ROS reactive oxygen generated by nano-copper oxide can also be used to kill microorganisms. This mechanism of generating reactive oxygen to kill microorganisms is different from that of a bactericide that generates silver ions binding to proteins on the cell wall or cell membrane of microorganisms and destroying the metabolic function of microorganisms to kill them. Therefore, when a nano-copper oxide antibacterial agent and silver phosphate (silver ion bactericide) are added to the coating at the same time, the two different antibacterial mechanisms can synergistically improve the antibacterial performance of the coating. After the coating is cured on the surface of the electrical equipment to form a coating, it can significantly enhance the ability of the surface of the substrate such as the electrical equipment to kill microorganisms.

[0037] Correspondingly, this application also provides a preparation method for an antifouling coating for inhibiting microbial growth. The preparation method includes: dissolving trifluorochlorosilane and hydroxyl-terminated polyphenylene ether into an organic solvent chloroform, then the hydrolysis reaction of trifluorochlorosilane triggered by a small amount of introduced water and the alcoholysis reaction of trifluorochlorosilane with the hydroxyl groups at the chain ends of polyphenylene ether release HCL, and the reaction is promoted by dropping ammonia water to adjust the pH to obtain a solution containing trifluorochlorosilane-modified polyphenylene ether; then dropping an organic solvent acetone to completely precipitate the trifluorochlorosilane-modified polyphenylene ether, collecting the precipitate to obtain the trifluorochlorosilane-modified polyphenylene ether, and then the trifluorochlorosilane-modified polyphenylene ether precipitate can be washed and dried for standby; then a preset ratio of trifluorochlorosilane-modified polyphenylene ether, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, vinyltrimethoxysilane, initiator, silver phosphate antibacterial agent, nano-copper oxide antibacterial agent, nano-silica and an organic solvent are mixed evenly to obtain an antifouling coating for inhibiting microbial growth.

[0038] At the same time, this application also provides an antifouling electrical equipment for inhibiting microbial growth. Taking an insulator as an example, the insulator can be a glass, ceramic or composite insulator; coating the above-mentioned antifouling coating for inhibiting microbial growth on the surface of electrical equipment such as an insulator and curing it can obtain an antifouling insulator for inhibiting microbial growth; of course, the electrical equipment can also be an insulating bushing, equipment base, lightning protection wire, etc.

[0039] Next, the antifouling coating for inhibiting microbial growth provided by this application will be specifically described in combination with examples and experimental examples.

[0040] Example 1

[0041] This embodiment provides a preparation method of an antifouling coating for inhibiting microbial growth, and its process is as Figure 1 shown. The preparation method includes: the step of modifying polyphenylene ether, the step of precipitating trifluorochlorosilane-modified polyphenylene ether, and the step of formulating the coating.

[0042] The step of modifying polyphenylene ether includes: adding 50 grams of chloroform into a three-necked flask, and then gradually adding 50 grams of hydroxyl-terminated polyphenylene ether (number-average molecular weight is about 4000 - 6000 g / mol) into the chloroform. Set the stirring speed to 300 rpm and stir for 30 minutes until the hydroxyl-terminated polyphenylene ether is completely dissolved to form a homogeneous solution. Subsequently, at room temperature, 7 grams of trifluorochlorosilane is dropped into the solution, and the dropping time is controlled within about 10 minutes. After the dropping is completed, continue to stir for 10 minutes. During this period, the pH value of the solution is adjusted to 6.5 by adding ammonia water to promote the reaction. After 45 minutes, the reaction ends, and a solution containing trifluorochlorosilane-modified polyphenylene ether is obtained.

[0043] The step of precipitating trifluorochlorosilane-modified polyphenylene ether includes: at room temperature, adding 120 mL of acetone into the solution containing trifluorochlorosilane-modified polyphenylene ether, stirring for 15 minutes, standing for 20 minutes to completely precipitate, and then filtering. The precipitate is collected, washed twice with acetone, with each amount being about 20 mL. Subsequently, it is dried in a vacuum drying oven at 50 °C for 6 hours to obtain dry trifluorochlorosilane-modified polyphenylene ether.

[0044] The step of formulating the coating includes: dissolving 10 grams of trifluorochlorosilane-modified polyphenylene ether in 50 grams of chloroform and stirring for 8 minutes; then adding 10 grams of nano-silica (D = 20 nm) and stirring for 25 minutes, and performing ultrasonic treatment with a treatment frequency of 40 kHz, a power of 200 W, and a treatment time of 20 minutes; subsequently adding 1 gram of silver phosphate and stirring for 10 minutes, adding 1 gram of nano-copper oxide (D = 50 nm), heating to 40 °C and stirring for 12 minutes, adding 3 grams of perfluoroalkyl ethyl acrylate and stirring for 8 minutes, adding 1 gram of glycidyl methacrylate and stirring for 10 minutes, adding 1 gram of vinyltrimethoxysilane and stirring for 8 minutes; finally adding 0.5 gram of diisopropylbenzene peroxide and stirring for 5 minutes, and performing ultrasonic treatment with an ultrasonic frequency of 40 kHz, a power of 200 W, and a time of 20 minutes to ensure that all components are fully dispersed, and thus an antifouling coating for inhibiting microbial growth can be obtained.

[0045] Example 2

[0046] This embodiment provides a preparation method of an antifouling coating for inhibiting microbial growth. The preparation method includes: the step of modifying polyphenylene ether, the step of precipitating trifluorochlorosilane-modified polyphenylene ether, and the step of formulating the coating.

[0047] The steps for modifying polyphenylene ether include: adding 40 g of chloroform into a three-necked flask, and then gradually adding 40 g of hydroxyl-terminated polyphenylene ether (number average molecular weight is about 4000 - 6000 g / mol) into the chloroform. Set the stirring speed at 350 rpm and stir for 30 minutes until the hydroxyl-terminated polyphenylene ether is completely dissolved to form a homogeneous solution. Subsequently, at room temperature, 6 g of trichlorofluorosilane is added dropwise to the solution, and the dropping time is controlled within about 10 minutes. After the dropping is completed, continue to stir for 10 minutes. During this period, the pH value of the solution is adjusted to 7 by adding ammonia water to promote the reaction. After 45 minutes, a solution containing trichlorofluorosilane-modified polyphenylene ether is obtained.

[0048] The steps for precipitating trichlorofluorosilane-modified polyphenylene ether include: at room temperature, adding 120 mL of acetone to the solution containing trichlorofluorosilane-modified polyphenylene ether, stirring for 15 minutes, standing for 20 minutes to make it completely precipitate, standing for 15 minutes and then filtering to collect the precipitate. The precipitate is washed twice with acetone, with about 20 mL used each time. Subsequently, it is dried in a vacuum drying oven at 50 °C for 8 hours to obtain dry trichlorofluorosilane-modified polyphenylene ether.

[0049] The steps for preparing the coating include: dissolving 10 g of trichlorofluorosilane-modified polyphenylene ether in 40 g of chloroform and stirring for 8 minutes; then adding 8 g of nano-silica (D = 20 nm) and stirring for 25 minutes, and performing ultrasonic treatment with a treatment frequency of 40 kHz, a power of 200 W, and a treatment time of 20 minutes; subsequently adding 0.8 g of silver phosphate and stirring for 10 minutes, adding 0.8 g of nano-copper oxide (D = 50 nm), heating to 40 °C and stirring for 12 minutes, adding 2.5 g of perfluoroalkyl ethyl acrylate and stirring for 8 minutes, adding 0.8 g of glycidyl methacrylate and stirring for 10 minutes, adding 0.8 g of vinyltrimethoxysilane and stirring for 8 minutes; finally adding 0.4 g of diisopropylbenzene peroxide and stirring for 5 minutes, and performing ultrasonic treatment with an ultrasonic frequency of 40 kHz, a power of 200 W, and a time of 20 minutes to ensure that all components are fully dispersed, and then an antifouling coating for inhibiting microbial growth can be obtained.

[0050] Example 3

[0051] This example provides a preparation method of an antifouling coating for inhibiting microbial growth. As the first comparative example of Example 1, the difference is that silver nitrate antibacterial agent is added. The preparation method includes: the steps of modifying polyphenylene ether, precipitating trichlorofluorosilane-modified polyphenylene ether, and preparing the coating.

[0052] The steps for modifying polyphenylene ether include: adding 50 grams of chloroform into a three-necked flask, and then gradually adding 50 grams of hydroxyl-terminated polyphenylene ether (number average molecular weight is about 4000 - 6000 g / mol) into the chloroform. Set the stirring speed to 300 rpm and stir for 30 minutes until the hydroxyl-terminated polyphenylene ether is completely dissolved to form a homogeneous solution. Subsequently, at room temperature, 7 grams of trichlorofluorosilane is dropped into the solution, and the dropping time is controlled at about 10 minutes. After the dropping is completed, continue to stir for 10 minutes. During this period, the pH value of the solution is adjusted to 6.5 by adding ammonia water to promote the reaction. After 45 minutes, a solution containing trichlorofluorosilane-modified polyphenylene ether is obtained.

[0053] The steps for precipitating trichlorofluorosilane-modified polyphenylene ether include: at room temperature, adding 120 mL of acetone into the solution containing trichlorofluorosilane-modified polyphenylene ether, stirring for 15 minutes, standing for 20 minutes to make it completely precipitate, then filtering, collecting the precipitate. The precipitate is washed twice with acetone, with each amount being about 20 mL. Subsequently, it is dried in a vacuum drying oven at 50 °C for 6 hours to obtain dry trichlorofluorosilane-modified polyphenylene ether.

[0054] The steps for preparing the coating include: dissolving 10 grams of trichlorofluorosilane-modified polyphenylene ether in 50 grams of chloroform and stirring for 8 minutes; then adding 10 grams of nano-silica (D = 20 nm) and stirring for 25 minutes, and performing ultrasonic treatment with a treatment frequency of 40 kHz, a power of 200 W, and a treatment time of 20 minutes; subsequently adding 1 gram of silver nitrate and stirring for 10 minutes, adding 1 gram of nano-copper oxide (D = 50 nm), heating to 40 °C and stirring for 12 minutes, adding 3 grams of perfluoroalkyl ethyl acrylate and stirring for 8 minutes, adding 1 gram of glycidyl methacrylate and stirring for 10 minutes, adding 1 gram of vinyltrimethoxysilane and stirring for 8 minutes; finally adding 0.5 gram of diisopropylbenzene peroxide and stirring for 5 minutes, and performing ultrasonic treatment with an ultrasonic frequency of 40 kHz, a power of 200 W, and a time of 20 minutes to ensure that all components are fully dispersed, thus obtaining an antifouling coating that inhibits the growth of microorganisms.

[0055] Example 4

[0056] This example provides a preparation method of an antifouling coating that inhibits the growth of microorganisms. As the second comparative example of Example 1, the difference is that trichlorofluorosilane-modified polyphenylene ether is not used. The preparation method includes: the steps for preparing the coating.

[0057] The steps for preparing the coating include: dissolving 10 g of hydroxyl-terminated polyphenylene ether (number-average molecular weight of about 4000 - 6000 g / mol) in 50 g of chloroform, and stirring for 8 minutes; then adding 10 g of nano-silica (D = 20 nm) and stirring for 25 minutes, followed by ultrasonic treatment at a frequency of 40 kHz, a power of 200 W, and a treatment time of 20 minutes; subsequently adding 1 g of silver phosphate and stirring for 10 minutes, adding 1 g of nano-copper oxide (D = 50 nm), heating to 40 °C and stirring for 12 minutes, adding 3 g of perfluoroalkyl ethyl acrylate and stirring for 8 minutes, adding 1 g of glycidyl methacrylate and stirring for 10 minutes, adding 1 g of vinyltrimethoxysilane and stirring for 8 minutes; finally adding 0.5 g of diisopropylbenzene peroxide and stirring for 5 minutes, and performing ultrasonic treatment at a frequency of 40 kHz, a power of 200 W, and a time of 20 minutes to ensure that all components are fully dispersed, thus obtaining an antifouling coating that inhibits the growth of microorganisms.

[0058] Example 5

[0059] This example provides a preparation method of an antifouling coating that inhibits the growth of microorganisms. As the third comparative example of Example 1, the difference is that no nano-copper oxide antibacterial agent is used. The preparation method includes: the step of modifying polyphenylene ether, the step of precipitating trifluorochlorosilane-modified polyphenylene ether, and the step of preparing the coating.

[0060] The step of modifying polyphenylene ether includes: adding 50 g of chloroform to a three-necked flask, and gradually adding 50 g of hydroxyl-terminated polyphenylene ether (number-average molecular weight of about 4000 - 6000 g / mol) to the chloroform. Set the stirring speed to 300 rpm and stir for 30 minutes until the hydroxyl-terminated polyphenylene ether is completely dissolved to form a homogeneous solution. Subsequently, at room temperature, 7 g of trifluorochlorosilane is dropped into the solution, and the dropping time is controlled within about 10 minutes. After the dropping is completed, continue to stir for 10 minutes. During this period, the pH value of the solution is adjusted to 6.5 by adding ammonia water to promote the reaction. After 45 minutes, the reaction ends to obtain a solution containing trifluorochlorosilane-modified polyphenylene ether.

[0061] The step of precipitating trifluorochlorosilane-modified polyphenylene ether includes: at room temperature, adding 120 mL of acetone to the solution containing trifluorochlorosilane-modified polyphenylene ether, stirring for 15 minutes, standing for 20 minutes to completely precipitate, and then filtering. The precipitate is collected, washed twice with acetone, with each amount being about 20 mL. Subsequently, it is dried in a vacuum drying oven at 50 °C for 6 hours to obtain dry trifluorochlorosilane-modified polyphenylene ether.

[0062] The steps for preparing the coating include: dissolving 10 g of trifluorochlorosilane-modified polyphenylene ether in 50 g of chloroform and stirring for 8 minutes; then adding 10 g of nano-silica (D = 20 nm) and stirring for 25 minutes, followed by ultrasonic treatment at a frequency of 40 kHz, a power of 200 W, and a treatment time of 20 minutes; subsequently adding 2 g of silver phosphate and stirring for 10 minutes, adding 3 g of perfluoroalkyl ethyl acrylate and stirring for 8 minutes, adding 1 g of glycidyl methacrylate and stirring for 10 minutes, adding 1 g of vinyltrimethoxysilane and stirring for 8 minutes; finally adding 0.5 g of diisopropylbenzene peroxide and stirring for 5 minutes, and then performing ultrasonic treatment at a frequency of 40 kHz, a power of 200 W, and a time of 20 minutes to ensure that all components are fully dispersed, thus obtaining an antifouling coating that inhibits microbial growth.

[0063] Experimental Example 1

[0064] In this experimental example, the antifouling coatings that inhibit microbial growth provided in Examples 1, 3 - 5 were subjected to performance tests, including hydrophobicity performance tests and antibacterial performance tests; among them, the antibacterial performance test results are shown in Tables 1 - 4, and the hydrophobicity performance test results are shown in Table 3.

[0065] Taking insulators as an example for the performance test, after cleaning the surface of the insulators to remove impurities such as oil stains and dust, the insulators without coating were left as the blank control group. The antifouling coatings that inhibit microbial growth provided in Examples 1, 3 - 5 were coated on the insulators and cured to form a coating as the experimental group. After the antifouling coatings that inhibit microbial growth provided in Examples 1, 3 - 5 were coated on the insulators and cured to form a coating, they were left standing at room temperature for 7 days as the long-term experimental group; subsequently, performance tests were carried out. The hydrophobicity of the coating was tested by the contact angle test method and the rolling angle test method, and the antibacterial performance was tested according to the ISO 22196 standard. The test strains of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were inoculated on the surface of the blank control group insulators without coating and the surface of the experimental group insulators with coating, and the initial inoculation concentration was 10 5 CFU / cm 2 , and then they were cultured at a temperature of 37 °C and 90% RH for 24 hours, and the change in colony-forming units (CFU) was counted. The test strains of E. coli and S. aureus were inoculated on the surface of the long-term experimental group insulators with coating, and the initial inoculation concentration was 10 5 CFU / cm 2 , and then they were cultured at 37 °C and a humidity of more than 90% for 24 hours, and the change in colony-forming units (CFU) was counted.

[0066] Table 1: Number of surface colonies after culturing at 37 °C and 90% RH for 24 hours

[0067]

[0068] Table 2: Bacteriostatic rate results

[0069]

[0070] Table 3: Number of surface colonies after standing at room temperature for 7 days and culturing at 37°C and 90% RH for 24 hours

[0071]

[0072] Table 4: Long - term bacteriostatic rate results after standing at room temperature for 7 days

[0073]

[0074] Table 5: Hydrophobic performance test results

[0075]

[0076] It can be seen from the colony count results shown in Table 1 that after inoculating 10 5 CFU / cm 2 of Escherichia coli and Staphylococcus aureus, and then culturing at 37°C and 90% RH for 24 hours, the colony counts of Escherichia coli and Staphylococcus aureus on the surface of the blank control group insulators without coating have reproduced and grown on a large scale. Ordinary insulators are difficult to resist microbial contamination, and the electrical performance of the insulators will be affected; while for the experimental group insulators with coatings formed by the coatings provided in Examples 1, 3 - 5, the colony counts of Escherichia coli and Staphylococcus aureus on the surface have decreased significantly; in order to more intuitively represent the bacteriostatic effect, the colony counts shown in Table 1 are processed. According to the antibacterial rate calculation formula: Antibacterial rate (%)=(1 - C / B) × 100%, where C is the colony count on the surface of the experimental group insulators (CFU / cm 2 ), and B is the colony count of the blank control group insulators (CFU / cm 2 ); the calculated bacteriostatic rates are shown in Table 2. It can be intuitively seen from the bacteriostatic rate results after data processing shown in Table 2 that since the coatings provided in Examples 1, 3 - 4 all contain components such as nano - copper oxide antibacterial agent and silver antibacterial agent, after curing to form a coating on the surface of the insulators, they can exert a significant bacteriostatic effect. However, since the coating provided in Example 5 does not contain both silver phosphate antibacterial agent and nano - copper oxide antibacterial agent at the same time, its antibacterial performance has slightly decreased;

[0077] Furthermore, it can be seen from the colony count results shown in Table 3 that after standing at room temperature for 7 days and then inoculating 10 5 CFU / cm 2Escherichia coli and Staphylococcus aureus were then cultured at 37°C and 90% RH for 24 hours. For the experimental group of insulators with a coating formed by the coatings provided in Examples 1, 3 - 5, the number of colonies of Escherichia coli and Staphylococcus aureus on the surface decreased, but the decrease amplitudes were different. From the antibacterial rate results shown in Table 4, it can be intuitively seen that the antibacterial rate decreased. For the coatings provided in Examples 1, 4 - 5, since silver phosphate was added, silver phosphate can release silver ions in a long - term manner, resulting in a very small decrease in the antibacterial rate. Especially for the coating provided in Example 1, the antibacterial rate decreased by less than 0.5%. However, for the experimental group of insulators with a coating formed by the coating provided in Example 3, the long - term antibacterial effect was poor. After standing at room temperature for 7 days, the antibacterial rate decreased by about 5%. This shows that compared with silver nitrate antibacterial agents, after adding silver phosphate antibacterial agents to the coating in this application, the coating has better long - term antibacterial performance and can provide long - term protection for some electrical equipment such as insulators.

[0078] And from the test results shown in Table 5, it can be seen that the water contact angle of the coatings formed by curing the anti - fouling coatings for inhibiting the growth of microorganisms provided in Examples 1, 3, and 5 is higher than 150°, and the rolling angle is lower than 10°, meeting the standards of super - hydrophobic coatings. However, for the coating formed by curing the anti - fouling coating for inhibiting the growth of microorganisms provided in Example 4, the water contact angle is 125.4° and the rolling angle is 15.7°. Although it has hydrophobic properties, since the polyphenylene ether added is not modified by trichlorosilane, it does not meet the super - hydrophobic standards.

[0079] The above - mentioned examples are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various examples of the present application.

Claims

1. An antifouling coating for inhibiting the growth of microorganisms, characterized in that, Comprising: A hydrophobic film-forming substance, an initiator, and a silver phosphate antibacterial agent.

2. The antifouling coating for inhibiting microbial growth according to claim 1, wherein The hydrophobic film-forming substance includes: polystyrene oxide modified with trichlorosilane, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, and vinyltrimethoxysilane.

3. The antifouling coating for inhibiting the growth of microorganisms according to claim 1, characterized in that, The antifouling coating for inhibiting microbial growth further includes: a nano-copper oxide antibacterial agent.

4. The antifouling coating for inhibiting microbial growth according to claim 1, wherein, The antifouling coating for inhibiting microbial growth further includes: nano-silica.

5. The antifouling coating for inhibiting the growth of microorganisms according to claim 1, wherein The initiator is selected from at least one of benzoyl peroxide, di-tert-butyl peroxide, and azobisisobutyronitrile.

6. The antifouling coating for inhibiting the growth of microorganisms according to claim 1, characterized in that, The antifouling coating for inhibiting microbial growth further includes: an organic solvent.

7. A method for preparing an antifouling coating for inhibiting the growth of microorganisms, characterized in that, For preparing an antifouling coating for inhibiting microbial growth according to any one of claims 1-6, comprising the following steps: Step S1: Drop ammonia water into chloroform, an organic solvent in which hydroxyl-terminated polystyrene oxide and trichlorosilane are dissolved, for reaction to obtain a solution in which polystyrene oxide modified with trichlorosilane is dissolved; Step S2: Add the organic solvent acetone to the solution in which polystyrene oxide modified with trichlorosilane is dissolved to completely precipitate the polystyrene oxide modified with trichlorosilane, and collect the precipitate to obtain the polystyrene oxide modified with trichlorosilane; Step S3: Mix the polystyrene oxide modified with trichlorosilane, perfluoroalkyl ethyl acrylate, glycidyl methacrylate, vinyltrimethoxysilane, the initiator, the silver phosphate antibacterial agent, the nano-copper oxide antibacterial agent, nano-silica, and the organic solvent uniformly to obtain an antifouling coating for inhibiting microbial growth.

8. The preparation method of an antifouling coating for inhibiting microbial growth according to claim 7, characterized in that, In step S3, the antifouling coating for inhibiting microbial growth includes: 5-15 parts by mass of polystyrene oxide modified with trichlorosilane, 2-4 parts by mass of perfluoroalkyl ethyl acrylate, 0.5-1.5 parts by mass of glycidyl methacrylate, 0.5-1.5 parts by mass of vinyltrimethoxysilane, 0.2-1 part by mass of the initiator, 0.5-1.5 parts by mass of the silver phosphate antibacterial agent, 0.5-1.5 parts by mass of the nano-copper oxide antibacterial agent, 6-12 parts by mass of nano-silica, and 30-60 parts by mass of the organic solvent.

9. Application of an antifouling coating for inhibiting microbial growth according to any one of claims 1-6 in the field of protection of electrical equipment.

10. An anti-fouling electrical device for inhibiting the growth of microorganisms, characterized in that, Comprising an electrical equipment and an antifouling coating for inhibiting microbial growth; The antifouling coating for inhibiting microbial growth is formed by curing an antifouling coating for inhibiting microbial growth according to any one of claims 1-6 on the surface of the electrical equipment.

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