CN114713487A - Spraying process of photocatalyst material and application thereof - Google Patents
Spraying process of photocatalyst material and application thereof Download PDFInfo
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- CN114713487A CN114713487A CN202210262066.2A CN202210262066A CN114713487A CN 114713487 A CN114713487 A CN 114713487A CN 202210262066 A CN202210262066 A CN 202210262066A CN 114713487 A CN114713487 A CN 114713487A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention belongs to the technical field of powder spraying processes, and particularly relates to a spraying process of a photocatalyst material and application thereof. The spraying process comprises the following steps: heating the substrate, and then performing electrostatic powder spraying on the substrate by using a photocatalyst material, wherein the voltage in the electrostatic powder spraying process is 1-3 ten thousand volts, and the time for maintaining 1-3 ten thousand volts is 0.5-5 seconds; when the substrate is an organic material substrate, the heating treatment temperature is 80-120 ℃, and when the substrate is an inorganic non-metal or metal substrate, the heating treatment temperature is 100-200 ℃. The adhesive force of the coating finally formed on the substrate reaches 0-1 level, the spraying process uses the photocatalyst material which contains antibacterial or air-purifying components, and the coating has good adhesive force, so that the long-term antibacterial or air-purifying performance of the coating can be ensured.
Description
Technical Field
The invention belongs to the technical field of powder spraying processes, and particularly relates to a spraying process of a photocatalyst material and application thereof.
Background
At present, air purification products in the market are disinfected and sterilized by using ultraviolet rays, negative ions, ozone, activated carbon adsorption, plasma and other modes. However, these disinfection methods have disadvantages in use, such as irreversible damage to human eyes and skin by ultraviolet rays; the negative ions have short service life, need to be released continuously, have limited purification effect, and need to be assisted by a fan to release derivatives such as ozone, superoxide and the like; ozone has strong oxidizing property and is greatly harmful to human bodies; the activated carbon adsorption method has low efficiency and is easy to saturate; the plasma mode has the problems of product distribution, difficult control of ozone and CO release, difficult control of relative humidity and temperature, high cost, complex operation and the like.
The application of the photocatalyst technology based on graphite phase carbon nitride and nano titanium dioxide materials in air purification or sterilization is a research direction which is receiving attention in recent years. The nanometer composite material is prepared by a composite technology of the nanometer composite material and a semiconductor material, so that the recombination of photo-generated electrons and holes can be effectively inhibited, and the light quantum efficiency is improved. In addition, the energy level band gap can be changed from high to low, so that the response of the photocatalytic material in a visible light wave band is enhanced, and the effects of disinfection, sterilization and volatile organic gas elimination under a fluorescent lamp or sunlight are realized.
The photocatalyst material needs to be coated in the using process, and the common coating process is as follows: conventional spraying, rolling, brushing, and the like. However, the conventional spraying process has the defects of large paint mist, serious material waste, short maintenance interval of a spraying room, waste of consumables, high emission of Volatile Organic Compounds (VOCs) and the like. The coating prepared by the brushing and rolling process is easy to generate the problems of rolling marks, brushing marks, thickness, sagging, uneven paint film thickness and the like, the flatness and the attractiveness of the coating are influenced, and the production efficiency is low.
Electrostatic powder spraying refers to a spraying process in which atomized coating particles are attracted to the surface of a target object (a spray object or a substrate) using an electric field. The working principle is that high-voltage electrostatic corona discharge generates an electrostatic field, powder materials are carried by compressed air and conveyed to a gun head of a spray gun through a powder conveying pipe, at the moment, powder passing through the gun head is provided with negative charges at a pole needle, powder particles with the charges enter the electrostatic field under the driving of airflow, and the powder uniformly flies to the surface of a target object and forms a coating with uniform thickness on the surface under the action of electrostatic field attraction force, gas driving force, powder self-gravity and charge repulsion force. Then, the adhesion force (level 2-5) of the coating of the product prepared by the existing electrostatic powder spraying process is relatively poor, the coating falling phenomenon is easy to occur (the reason that the coating falls easily also includes that the material variety of the substrate is very large, the existing electrostatic powder spraying process is not universal), and if the component with the antibacterial effect is added into the powder to be constructed in the electrostatic powder spraying mode, the prepared product is easy to fall off due to the coating, so that the antibacterial performance of the surface of the product is further easy to deteriorate.
Therefore, it is highly desirable to provide a spraying process for photocatalyst materials, which can obtain a product with a high coating adhesion on the surface, which can prolong the antibacterial or air-purifying performance of the product, and which has a good universality for the substrate type.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the spraying process of the photocatalyst material and the application thereof have good universality on a substrate, and the coating prepared by the spraying process has good adhesive force on the surface of the substrate, and the adhesive force grade can reach 0-1 grade. The photocatalyst material used in the spraying process contains components for resisting bacteria or purifying air, and the coating has good adhesive force, so that the long-term performance of resisting bacteria or purifying air of the coating can be ensured.
The invention conception of the invention is as follows: heating the substrate at a specific temperature (the temperature of the heating treatment is 80-120 ℃ when the substrate is an organic material substrate, the temperature of the heating treatment is 100-200 ℃ when the substrate is an inorganic nonmetal or metal substrate), wherein the voltage in the electrostatic powder spraying process is 1-3 ten thousand volts, and the time for maintaining 1-3 ten thousand volts is 0.5-5 seconds (the maintaining time refers to the time of each substrate under the environment of 1-3 ten thousand volts, and can be controlled by adjusting the transmission speed of a conveyor belt, for example, the transmission speed of the conveyor belt is 0.2-2m/s, so that the maintaining time of each substrate on the conveyor belt under the environment of 1-3 ten thousand volts is 0.5-5 seconds, the adhesive force of the coating finally formed on the substrate reaches 0-1 level, and the spraying process uses a photocatalyst material (the photocatalyst material is a powder coating), the photocatalyst material contains components for resisting bacteria or purifying air, and the coating has good adhesive force, so that the long-term antibacterial or air-purifying performance of the coating can be ensured.
The first aspect of the invention provides a spraying process of a photocatalyst material.
Specifically, the spraying process of the photocatalyst material comprises the following steps:
heating the substrate, and then performing electrostatic powder spraying on the substrate by using a photocatalyst material, wherein the voltage in the electrostatic powder spraying process is 1-3 ten thousand volts, and the time for maintaining 1-3 ten thousand volts is 0.5-5 seconds;
when the substrate is an organic material substrate, the heating treatment temperature is 80-120 ℃, and when the substrate is an inorganic nonmetal or metal substrate, the heating treatment temperature is 100-200 ℃.
Preferably, the temperature of the heating treatment when the substrate is an organic material substrate is 80-120 ℃, and the temperature of the heating treatment when the substrate is an inorganic non-metal or metal substrate is 100-150 ℃.
Preferably, the substrate is heat-treated for 20 to 30 minutes.
Preferably, the voltage in the electrostatic powder spraying process is 1.5-2.5 ten thousand volts, and the time for maintaining 1.5-2.5 ten thousand volts is 0.5-2 seconds.
Preferably, the organic material substrate is selected from the group consisting of PS (polystyrene), PMMA (polymethyl methacrylate), PC (polycarbonate), styrene-acrylate copolymer (NAS), polymethylpentene (TPX), Allyl Diglycol Carbonate (ADC), Polysulfone (PSU), polycyclodecamethacrylate (type OZ-1000, OZ-1011, OZ-1012 or OZ-1013), Cyclic Olefin Polymer (COP) and carbon material. The carbon material also includes wood.
Preferably, the inorganic nonmetal is selected from a single crystal material, a polycrystalline material or an amorphous material, and further preferably SiO2、Al2O3Glass or ceramic.
Preferably, the metal substrate is selected from aluminum, iron, copper or an alloy.
Preferably, the surface of the substrate is free of a microporous structure, has a frosted feature, or has a microprismatic structure.
Preferably, the photocatalyst material used in the electrostatic powder spraying process contains an antibacterial or air-purifying component.
Preferably, the photocatalyst material is a material which can initiate reaction by ultraviolet light or visible light, and the photocatalyst material is in a powder shape.
Preferably, the photocatalyst material contains nano titanium dioxide or graphite phase carbon nitride.
Preferably, the photocatalyst material comprises an antibacterial composite material of nano titanium dioxide or an antibacterial composite material of graphite phase carbon nitride (commercially available), and particularly, the photocatalyst material comprises TiO2/SiO2Composite material, TiO2Hydroxyapatite composite material and TiO2/MoS2Composite material and TiO2/WS2Composite material and TiO2Pt/TiO composites2/WO3Composite material and TiO2A CuO composite material.
Preferably, an electrostatic spraying machine is used for spraying in the electrostatic powder spraying process, the suction time of the electrostatic spraying machine is 0.2-2 seconds, and the scattering time of the electrostatic spraying machine is 0.2-2 seconds; further preferably, an electrostatic spraying machine is used for spraying in the electrostatic powder spraying process, the suction time of the electrostatic spraying machine is 0.2-0.8 second, and the scattering time of the electrostatic spraying machine is 0.2-0.8 second.
Preferably, the spraying process sequentially uses a conveying belt, a heating device, an exhaust fan, an electrostatic spraying machine and a thermocuring device, wherein the electrostatic spraying machine comprises a powder tank, an electrostatic generator, a spray gun and a powder room (the powder tank is outside the electrostatic spraying machine, the spray gun is inside the electrostatic spraying machine), and the exhaust fan and the electrostatic spraying machine are connected through a pipeline. And conveying the substrate by adopting a conveying belt in the spraying process, heating the substrate from a heating device, then feeding the substrate into a powder room of an electrostatic spraying machine, spraying a photocatalyst material, feeding the substrate into a thermocuring device through the conveying belt, and finally preparing the substrate with the coating on the surface.
Preferably, the spraying process of the photocatalyst material comprises the following steps:
placing the substrate on a conveyor belt, conveying the substrate into heating equipment, and heating the substrate;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after the powder tank and the spray gun are cleaned;
starting an electrostatic generator in the electrostatic spraying machine, adjusting the voltage and the maintaining time, wherein the voltage is 1-3 ten thousand volts, the maintaining time of 1-3 ten thousand volts is 0.5-5 seconds, the maintaining time refers to the time of each substrate under the environment of 1-3 ten thousand volts, and the maintaining time can be controlled by adjusting the conveying speed of a conveyor belt, for example, the conveying speed of the conveyor belt is 0.2-2m/s, so that the maintaining time of each substrate under the environment of 1-3 ten thousand volts is 0.5-5 seconds;
and continuously conveying the substrate to a powder chamber of the electrostatic spraying machine, starting the electrostatic spraying machine, adjusting the suction time and the scattering time, spraying the photocatalyst material on the surface of the substrate from a spray gun (namely spraying the photocatalyst material on the substrate to form a coating on the surface of the substrate), conveying the substrate sprayed with the photocatalyst material to a thermocuring device through a conveying belt for curing, and finishing the spraying process after the curing is finished.
Preferably, the curing temperature is 55-85 deg.C (preferably 60-80 deg.C), and the curing time is 3-8 min.
Preferably, 5-10 samples can be coated in a small batch by trial, the coating thickness is adjusted, the coating quality is checked, the quality to be checked meets the requirement, and large-scale production is started; the quality and the thickness of a sample coating are checked in time in the production process, the continuous operation of a machine table is ensured, and the powder photocatalyst material is supplemented.
And after the spraying work is finished, closing the electrostatic spraying machine, the electrostatic generator and the exhaust fan power switch.
Preferably, the spray coating process forms a coating on the substrate having a thickness of 1 to 30 μm, preferably 5 to 15 μm.
Preferably, after the substrate is heat treated, a layer of adhesive is applied to the surface of the substrate before spraying. The use of the binder further improves the good adhesion of the photocatalyst material to the substrate for a long time, thereby significantly prolonging the antibacterial or air-purifying properties of the surface coating of the substrate.
Preferably, the binder is at least one selected from the group consisting of a polyimide resin binder, a polyurethane resin binder, a polyester resin binder, a polyamideimide resin binder, a polyolefin resin binder, a phenol resin binder, an epoxy resin binder, a silicone resin binder, a methacrylic-amino acrylic resin binder, an alkyd resin binder, a polyacrylamide resin binder, and a chlorinated polypropylene resin binder.
The mass percentage of the resin in the adhesive is 50-90%, and the mass percentage of the auxiliary agent is 10-50%.
Preferably, the auxiliary agent comprises a solvent, a fixing agent and an accelerator. The above-mentioned adhesives are commercially available.
The second aspect of the present invention provides an application of a spraying process of a photocatalyst material.
The spraying process of the photocatalyst material is applied to the field of air purifier preparation.
An air purifier comprises the coating prepared by the spraying process.
The air purifier can sterilize, disinfect or purify polluted gas in air.
Compared with the prior art, the invention has the following beneficial effects:
(1) the spraying process of the photocatalyst material comprises the steps of carrying out heating treatment on a substrate at a specific temperature (the heating treatment temperature is 80-120 ℃ when the substrate is an organic material substrate, the heating treatment temperature is 100-200 ℃ when the substrate is an inorganic nonmetal or metal substrate), keeping the voltage in the electrostatic powder spraying process at 1-3 ten thousand volts for 0.5-5 seconds, and ensuring the adhesive force of a coating finally formed on the substrate to reach 0-1 level.
(2) After the substrate is heated and before spraying, a layer of adhesive is coated on the surface of the substrate. The use of the binder further improves the good adhesion of the photocatalyst material to the substrate for a long time, thereby significantly prolonging the antibacterial or air-purifying properties of the surface coating of the substrate.
(3) Compared with other coating modes, the coating obtained by the spraying process disclosed by the invention is higher in quality, more uniform in film coating, automatic in spraying by a machine, and capable of automatically operating according to a design program, free from manual spraying, avoiding the phenomena of missing spraying and over spraying, enabling a paint film to be easy to level, enabling the paint film to be smoother, and obviously improving the distinctness of image and the glossiness of the paint film. And the adhesion rate of the coating (namely the photocatalyst material) can be increased, the spraying operation environment is improved, and the occupational health level is improved.
Drawings
Fig. 1 is a schematic view of a spraying process of a photocatalyst material in embodiment 1 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
The photocatalyst material used in the following embodiment is provided by Shenzhen titanium and New Material science and technology Limited, and the model is LAK; the following adhesives are available from Erentals electric insulation materials (Zhuhai) Inc., product number PED1000-70 (009. sup. 0008, STERLING 77X-010 are also possible).
Example 1: spraying process of photocatalyst material
A spraying process of a photocatalyst material comprises the following steps:
placing a substrate (PMMA) on a conveyor belt, conveying the substrate (PMMA) into heating equipment, and heating the substrate at the temperature of 80 ℃ for 25 minutes;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after the powder tank and the spray gun are cleaned;
starting an electrostatic generator in the electrostatic spraying machine, and adjusting the voltage and the maintaining time, wherein the voltage is 2 ten thousand volts, and the maintaining time of 2 ten thousand volts is 2 seconds (the maintaining time refers to the time of each substrate under the environment of 2 ten thousand volts, and the maintaining time can be controlled by adjusting the conveying speed of the conveyor belt, for example, the conveying speed of the conveyor belt is 0.5m/s, so that the maintaining time of each substrate under the environment of 2 ten thousand volts is 2 seconds);
continuously conveying the substrate to a powder chamber of an electrostatic spraying machine, starting the electrostatic spraying machine, wherein the suction time is 0.5 second, the scattering time is 0.5 second, the photocatalyst material is sprayed out of a spray gun and sprayed on the surface of the substrate (namely the photocatalyst material is sprayed on the substrate, and a coating is formed on the surface of the substrate), the substrate sprayed with the photocatalyst material is conveyed to a thermocuring device through a conveying belt for curing, the curing temperature is 65 ℃, the curing time is 5 minutes, and after the curing is finished, the spraying process is finished.
The thickness of the coating formed on the substrate by the spraying process is 10 micrometers, and after the spraying operation is finished, the power switches of the electrostatic spraying machine and the electrostatic generator are turned off.
Fig. 1 is a schematic view showing a flow of a coating process of a photocatalyst material according to example 1 of the present invention, where 100 in fig. 1 represents heating a substrate, 200 represents activating an electrostatic generator in an electrostatic coater, adjusting a voltage and a holding time, 300 represents activating the electrostatic coater, adjusting a suction time and a scattering time, and then performing coating, and 400 represents curing.
Example 2: spraying process of photocatalyst material
A spraying process of a photocatalyst material comprises the following steps:
placing a substrate (PS) on a conveyor belt, conveying the substrate into heating equipment, and heating the substrate at 100 ℃ for 25 minutes;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after the powder tank and the spray gun are cleaned;
starting an electrostatic generator in the electrostatic spraying machine, and adjusting the voltage and the maintaining time, wherein the voltage is 1.5 ten thousand volts, and the maintaining time for 1.5 ten thousand volts is 3 seconds (the maintaining time refers to the time of each substrate under the environment of the voltage of 1.5 ten thousand volts, and the maintaining time can be controlled by adjusting the conveying speed of the conveyor belt, for example, the conveying speed of the conveyor belt is 0.33m/s, so that the maintaining time for each substrate under the environment of the voltage of 1.5 ten thousand volts is 3 seconds);
continuously conveying the substrate to a powder chamber of an electrostatic spraying machine, starting the electrostatic spraying machine, wherein the suction time is 0.5 second, the scattering time is 0.5 second, the photocatalyst material is sprayed out of a spray gun and sprayed on the surface of the substrate (namely the photocatalyst material is sprayed on the substrate, and a coating is formed on the surface of the substrate), the substrate sprayed with the photocatalyst material is conveyed to a thermocuring device through a conveying belt for curing, the curing temperature is 65 ℃, the curing time is 5 minutes, and after the curing is finished, the spraying process is finished.
The thickness of the coating formed on the substrate by the spraying process is 10 microns, and after the spraying work is finished, the power switch of the electrostatic spraying machine and the electrostatic generator is closed.
Example 3: spraying process of photocatalyst material
A spraying process of a photocatalyst material comprises the following steps:
placing a substrate (aluminum) on a conveyor belt, conveying the substrate (aluminum) into heating equipment, and heating the substrate at the temperature of 150 ℃ for 25 minutes;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after the powder tank and the spray gun are cleaned;
starting an electrostatic generator in the electrostatic spraying machine, adjusting the voltage and the maintaining time, wherein the voltage is 3 kilovolts, and the maintaining time of 3 kilovolts is 1 second (the maintaining time refers to the time of each substrate under the environment of 3 kilovolts, and the maintaining time can be controlled by adjusting the conveying speed of a conveying belt);
continuously conveying the substrate to a powder chamber of an electrostatic spraying machine, starting the electrostatic spraying machine, wherein the suction time is 0.5 second, the scattering time is 0.5 second, the photocatalyst material is sprayed out of a spray gun and sprayed on the surface of the substrate (namely the photocatalyst material is sprayed on the substrate, and a coating is formed on the surface of the substrate), the substrate sprayed with the photocatalyst material is conveyed to a thermocuring device through a conveying belt for curing, the curing temperature is 65 ℃, the curing time is 5 minutes, and after the curing is finished, the spraying process is finished.
The thickness of the coating formed on the substrate by the spraying process is 10 micrometers, and after the spraying operation is finished, the power switches of the electrostatic spraying machine and the electrostatic generator are turned off.
Example 4: spraying process of photocatalyst material
A spraying process of a photocatalyst material comprises the following steps:
a Substrate (SiO)2) Placing the substrate on a conveyor belt, conveying the substrate into heating equipment, and heating the substrate at 180 ℃ for 25 minutes;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after the powder tank and the spray gun are cleaned;
starting an electrostatic generator in the electrostatic spraying machine, adjusting the voltage and the maintaining time, wherein the voltage is 1 ten thousand volts, and the maintaining time of 1 ten thousand volts is 2 seconds (the maintaining time refers to the time of each substrate in the environment with the voltage of 1 ten thousand volts, and the maintaining time can be controlled by adjusting the conveying speed of a conveying belt);
continuously conveying the substrate to a powder chamber of an electrostatic spraying machine, starting the electrostatic spraying machine, wherein the suction time is 0.5 second, the scattering time is 0.5 second, the photocatalyst material is sprayed out of a spray gun and sprayed on the surface of the substrate (namely the photocatalyst material is sprayed on the substrate, and a coating is formed on the surface of the substrate), the substrate sprayed with the photocatalyst material is conveyed to a thermocuring device through a conveying belt for curing, the curing temperature is 65 ℃, the curing time is 5 minutes, and after the curing is finished, the spraying process is finished.
And after the spraying work is finished, turning off the power switch of the electrostatic spraying machine and the electrostatic generator.
Example 5
Compared with example 1, in example 5, before the photocatalyst material is used for electrostatic powder spraying on the substrate, a layer of adhesive with the thickness of about 10 μm is coated on the surface of the substrate, and the substrate is cured (curing is a conventional process in the field), and the rest of the process is the same as that of example 1.
Comparative example 1
The comparative example 1 is different from example 1 only in that the temperature of the substrate heat treatment is 25 c, and the rest of the process is the same as example 1.
Comparative example 2
The comparative example 2 is different from example 2 only in that the static and dynamic generator is started, the voltage and the maintaining time are adjusted, the voltage is 0.5 ten thousand volts, the maintaining time is 3 seconds for 0.5 ten thousand volts, and the rest of the process is the same as example 2.
Comparative example 3
The only difference in comparative example 3 compared with example 3 is that the temperature of the substrate heat treatment was 25 c, and the rest of the procedure was the same as in example 3.
Comparative example 4
The comparative example 4 is different from example 4 only in that the static and dynamic generator is started, the voltage and the maintaining time are adjusted, the voltage is 0.6 ten thousand volts, the maintaining time is 2 seconds for 0.6 ten thousand volts, and the rest of the process is the same as example 4.
Product effectiveness testing
1. Adhesion Effect test
The adhesion was tested according to the method specified in GB/T9286-2021. The testing steps are as follows: the experimental tool is a hundred-grid cutter, is a multi-blade cutter with 6 cutting surfaces and is made of high alloy steel, and the clearance of the cutter is 1 mm. A piece of coating plate to be tested (namely the substrate treated by the spraying process of the embodiments 1-4 and the comparative examples 1-4) is taken, and is pulled in parallel for 3-4cm on the coating plate to be tested by a grid-scribing tester to form six cutting marks, and a paint film is required to be cut through. Then, the cutting is performed vertically with the former by the same method, six cuts are formed, and finally, a plurality of small squares are formed. The adhesion of the coatings on the surfaces of the substrates treated by the spray coating processes of examples 1 to 4 and comparative examples 1 to 4 obtained by lightly brushing the test coating with a soft brush from a diagonal direction for 5 times, then inspecting the cut surfaces of the test coatings with a 4-fold magnifying glass and grading in comparison with table 1 is shown in table 2.
Table 1: coating adhesion rating scale
Table 2: results of surface coating adhesion of examples 1-4 and comparative examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Adhesion force | Level 1 | Level 0 | Level 1 | Level 0 | Grade 3 | 4 stage | 4 stage | Grade 5 |
As can be seen from Table 2, the coatings formed on the surfaces of the substrates treated by the spraying processes of examples 1 to 4 of the present invention have good adhesion, which is significantly better than that of comparative examples 1 to 4, and the adhesion of the coatings formed on the surfaces of the substrates of comparative examples 1 to 4 is greatly reduced because the substrates are not subjected to heating treatment at a proper temperature or the voltage during the spraying process is low.
2. Antimicrobial time test
The substrates treated by the spraying processes of examples 1 and 5 and comparative example 1 were taken, the antibacterial rate of the surface coating of the substrate (marked as antibacterial rate at 0 hour) was tested, then the substrate was placed in an environment with a relative humidity of 85% at 60 ℃ for 96 hours (marked as antibacterial rate at 96 hours) and 720 hours (marked as antibacterial rate at 720 hours), and then the antibacterial rate of the surface coating of the substrate to escherichia coli was tested, the antibacterial rate test method was according to GB/T30706-.
Table 3: antibacterial effect
As can be seen from table 3, in example 5, since a layer of adhesive is coated, the adhesion strength between the surface coating and the substrate is further improved, so that even in example 5, the surface coating still has a good adhesion effect even after being subjected to an environment of 60 ℃ and 85% relative humidity for 720 hours, and the antibacterial property of the surface coating is well maintained.
Comparative example 1 the temperature of the substrate heat treatment is too low, which causes the coating formed by the photocatalyst material sprayed on the surface of the substrate to be uneven, and further causes the antibacterial property of the surface coating of comparative example 1 to be inferior to that of example 1. In comparative example 1, the surface coating further peeled off after passing through an environment of 60 ℃ and 85% relative humidity for 96 hours, resulting in a further significant decrease in antibacterial properties.
Claims (10)
1. The spraying process of the photocatalyst material is characterized by comprising the following steps of:
heating the substrate, and then performing electrostatic powder spraying on the substrate by using a photocatalyst material, wherein the voltage in the electrostatic powder spraying process is 1-3 ten thousand volts, and the time for maintaining 1-3 ten thousand volts is 0.5-5 seconds;
when the substrate is an organic material substrate, the heating treatment temperature is 80-120 ℃, and when the substrate is an inorganic nonmetal or metal substrate, the heating treatment temperature is 100-200 ℃.
2. The spray coating process according to claim 1, comprising the steps of: when the substrate is an organic material substrate, the heating treatment temperature is 80-120 ℃, and when the substrate is an inorganic nonmetal or metal substrate, the heating treatment temperature is 100-150 ℃.
3. The spray coating process of claim 1 wherein the organic material substrate is selected from polystyrene, polymethylmethacrylate, polycarbonate, styrene-acrylate copolymer, polymethylpentene, allyl diglycol carbonate, polysulfone, polycyclodecamethacrylate, cyclic olefin polymers or carbon materials; the metal substrate is selected from aluminum, iron, copper or an alloy; the inorganic non-metallic substrate is selected from glass or ceramic.
4. The spray coating process of claim 1 wherein said photocatalytic material contains an antimicrobial, antiviral or air purifying component.
5. The spraying process of claim 1, wherein the electrostatic powder spraying process is carried out by using an electrostatic sprayer, the suction time of the electrostatic sprayer is 0.2-2 seconds, and the scattering time of the electrostatic sprayer is 0.2-2 seconds.
6. The spraying process of claim 1, wherein a conveyor belt, a heating device, an exhaust fan, an electrostatic sprayer and a thermosetting device are sequentially used in the spraying process, wherein the electrostatic sprayer comprises a powder tank, an electrostatic generator, a spray gun and a powder room, and the exhaust fan and the electrostatic sprayer are connected through a pipeline.
7. A spraying process according to claim 6, characterized by comprising the steps of:
placing the substrate on a conveyor belt, conveying the substrate into heating equipment, and heating the substrate;
starting an exhaust fan to clean the powder tank and the spray gun, and adding a photocatalyst material into the powder tank after cleaning;
starting an electrostatic generator in the electrostatic spraying machine, adjusting the voltage and the maintaining time, wherein the voltage is 1-3 ten thousand volts, and the maintaining time of 1-3 ten thousand volts is 0.5-5 seconds;
and continuously conveying the substrate to a powder chamber of the electrostatic spraying machine, starting the electrostatic spraying machine, adjusting the suction time and the scattering time, spraying the photocatalyst material on the surface of the substrate from a spray gun, conveying the substrate sprayed with the photocatalyst material to a thermocuring device through a conveying belt for curing, and finishing the spraying process after the curing is finished.
8. The spray coating process of claim 6 wherein the substrate is coated with a layer of adhesive after the substrate has been heat treated and before the coating.
9. Use of the spray coating process according to any one of claims 1 to 8 in the manufacture of an air cleaner.
10. An air cleaner comprising a coating produced by the spray coating process of any one of claims 1 to 8.
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