Cleaning equipment with nano-composite coating

Abstract

The invention relates to the technical field of cleaning, and discloses cleaning equipment with a nano-composite coating, the cleaning equipment comprises a key component, the surface of the key component is coated with the nano-composite coating, the nano-composite coating comprises nano titanium dioxide and nano silver, and the key component comprises a sewage tank inner wall, a sewage suction port and a sewage pipeline; the nano coating is applied to key components such as a sewage pipeline, a sewage suction port and the inner wall of a sewage tank of the cleaning equipment, so that the cleaning efficiency of the cleaning equipment can be improved by more than 15%; the application of the nano coating improves the pollution resistance, the wear resistance and the corrosion resistance of the cleaning equipment parts by 50% or above, the service life of the cleaning equipment is effectively prolonged, and the application of the nano coating can reduce the use amount of the chemical cleaning liquid of the cleaning equipment to be within 5%, so that green cleaning is realized.

Description

Technical Field

[0001] The present invention relates to the field of cleaning technology, and particularly to a cleaning device with a nano-composite coating. Background Art

[0002] With the improvement of people's living standards, the requirements for home cleaning are becoming increasingly strict. As an efficient and convenient household cleaning device, the floor washer is favored by more and more consumers.

[0003] However, there are still some problems in the current floor washer during the cleaning process. For example, after long-term use, impurities are likely to adhere to the surface of the water absorption component of the floor washer, generating odors, and bacteria and odors will breed in the sewage tank after long-term use. And to achieve good cleaning effects, a large amount of chemical cleaners are often needed, which not only increases the usage cost but also may cause certain harm to the environment and human health.

[0004] Based on the fact that the nano-coating technology shows great application potential in the field of household cleaning devices, its special properties are expected to solve the existing cleaning problems of the floor washer and improve the overall performance of the floor washer. Therefore, we propose a cleaning device with a nano-composite coating. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cleaning device with a nano-composite coating. By selecting nano-coating materials, optimizing the preparation process, and conducting application research on the key components of the cleaning device, the cleaning efficiency and antibacterial effect of the cleaning device are improved, the usage amount of chemical substances is reduced, and a better cleaning experience is provided for users.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: In the first aspect, a cleaning device with a nano-composite coating is provided, including key components, the surfaces of which are coated with a nano-composite coating. The nano-composite coating includes nano-titanium dioxide and nano-silver, and the key components include the inner wall of the sewage tank, the sewage suction port, and the sewage pipeline.

[0007] Optionally, the nano-composite coating further includes nano-silica.

[0008] Optionally, the nano-titanium dioxide is anatase type with a particle size of 20 - 50 nm, the nano-silver has a particle size of 10 - 30 nm, and the nano-silica has a particle size of 10 - 40 nm.

[0009] Optionally, the mass ratio of nano-titanium dioxide to nano-silver in the nano-composite coating is (5 - 10):1, and the addition amount of nano-silica is 5% - 15% of the total mass of the nano-composite coating.

[0010] Optionally, the surface material of the key component is made of plastic or rubber.

[0011] Optionally, the average adhesion force between the nano-composite coating and the surface of the key component is ≥95%.

[0012] In a second aspect, a method for preparing the nano-composite coating according to the first aspect is provided, including the following preparation steps: S1. Mix tetrabutyl titanate, absolute ethanol, and glacial acetic acid according to a volume ratio of 1:(3 - 5):(0.5 - 1), and stir evenly to obtain a tetrabutyl titanate solution; S2. Dissolve silver nitrate in deionized water to prepare a silver nitrate solution with a concentration of 0.01 - 0.1 mol / L; S3. Under stirring conditions, slowly drop the silver nitrate solution in step S2 into the tetrabutyl titanate solution in step S1 according to a volume ratio of 1:(5 - 10), and at the same time add nano-silica accounting for 1% - 5% of the total mass of the mixed solution, and continue to stir for 30 - 60 minutes to form a uniform sol; S4. Let the sol stand and age at 25 - 50 °C for 12 - 24 hours to form a gel; S5. After drying the gel at 60 - 80 °C for 12 - 24 hours, calcine it at 400 - 600 °C for 2 - 4 hours to obtain nano-composite coating material powder; S6. Mix the powder with a binder and a solvent to make a nano-coating slurry with a solid content of 10% - 30%, and coat it on the surface of the key component.

[0013] Optionally, the coating technology in step S6 adopts spraying, dip coating or film coating, and the thickness of the coated layer is 5 - 20 μm.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In the present invention, applying a nano-coating on key components such as the sewage pipeline, sewage suction port, and inner wall of the sewage tank of the cleaning equipment can increase the cleaning efficiency of the cleaning equipment by more than 15%; the application of the nano-coating improves the anti-fouling, wear resistance, and corrosion resistance of the cleaning equipment components by more than 50%, effectively extends the service life of the cleaning equipment, and through the application of the nano-coating, the consumption of chemical cleaning liquid for the cleaning equipment can be reduced to less than 5%, realizing green cleaning; (2) In the present invention, by optimizing the coating process, the average adhesion force of the nano-coating on the surface of common materials for household cleaning equipment reaches more than 95%, ensuring the stability and durability of the coating; (3) In the present invention, nano-titanium dioxide has excellent photocatalytic performance and can decompose organic pollutants in the air under light irradiation, while having a certain antibacterial effect; nano-silver has broad-spectrum antibacterial properties and can quickly and effectively inhibit the growth and reproduction of a variety of bacteria. The combination of nano-titanium dioxide and nano-silver to form a nano-composite coating material can give full play to the advantages of both and significantly improve the antibacterial performance and self-cleaning ability of the floor washer; (4) Adding an appropriate amount of nano-silica to the nano-composite coating material can enhance the hardness and wear resistance of the coating, and improve the stability and service life of the coating. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a cleaning device with a nano-composite coating in an embodiment of the present invention; Figure 2 is a schematic process flow diagram of the preparation process of the nano-composite coating in an embodiment of the present invention; Among them, 1. Body; 2. Sewage tank; 3. Sewage pipe; 4. Suction port; 5. Cleaning roller brush. Detailed Description of the Invention

[0016] Now, the present invention will be further described in detail with reference to the drawings and embodiments. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention. Embodiment 1

[0017] As Figure 1 shown, a cleaning device with a nano-composite coating includes a body 1 and a floor brush structure. A detachable sewage tank 2 is installed on the body 1. The floor brush structure is installed below the body 1, and a suction port 4 is provided at the bottom of the floor brush structure. A cleaning roller brush 5 is installed at the front end of the suction port 4. A sewage pipe 3 is provided inside the floor brush structure, and one end of the sewage pipe 3 is communicated with the suction port 4, and the other end is communicated with the sewage tank 2.

[0018] A water tank is also provided on the body 1. When the cleaning device works, the motor drives the cleaning roller brush 5 to rotate, and the clean water in the water tank is sprayed on the cleaning roller brush 5 to clean the dirt on the ground; then, under the action of the vacuum motor on the body 1, the sewage on the ground enters the sewage tank 2 from the suction port 4 along the sewage pipe 3 for storage.

[0019] Among them, the key components of the cleaning device are the parts that are directly in contact with sewage, stains or air circulation, including: The inner wall of the sewage tank 2 is usually made of polypropylene (PP) plastic, and the inner wall is smooth and easy to attach dirt; The suction port 4 is located at the front end of the water absorption component, and the material is usually nitrile rubber (NBR). It is easy to breed bacteria when in contact with sewage for a long time; The sewage pipe 3, which is used to connect the sewage tank 2 and the sewage suction port 4, is usually made of ethylene propylene diene monomer (EPDM), and sewage impurities are likely to remain on its inner wall.

[0020] The surfaces of the above key components are all coated with a nano-composite coating, that is, the inner wall surface of the sewage tank 2, the sewage suction port 4 and the inner surface of the sewage pipe 3 are all coated with a nano-composite coating, which can significantly improve the anti-fouling, wear resistance, corrosion resistance and antibacterial ability of the components, and increase the cleaning efficiency of the cleaning equipment by more than 15%.

[0021] In view of the working environment and cleaning requirements of cleaning equipment (such as floor scrubbers), the present invention screens and evaluates a variety of nano-coating materials, focuses on considering performance indicators such as anti-fouling, wear resistance, corrosion resistance, and antibacterial properties of the materials, and at the same time studies the adhesion of different materials on the surfaces of common materials used in floor scrubbers (such as plastics, rubbers, etc.). The nano-coating is applied to key components such as the sewage tank 2, the sewage pipe 3 and the sewage suction port 4 of the floor scrubber. By optimizing the composition and preparation process of the materials, the stability and service life of the nano-coating are improved to ensure that it can continuously play a role in the complex working environment of the floor scrubber.

[0022] The above nano-composite coating materials have excellent performance in anti-fouling, wear resistance, corrosion resistance, antibacterial, etc., and can effectively cope with the complex working environment of the floor scrubber, including but not limited to nano-titanium dioxide (TiO2) and nano-silver (Ag) composite coating materials.

[0023] Among them, nano-titanium dioxide has excellent photocatalytic performance and can decompose organic pollutants in the air under light conditions, and at the same time has a certain antibacterial effect; nano-silver has broad-spectrum antibacterial properties and can quickly and effectively inhibit the growth and reproduction of a variety of bacteria. The nano-titanium dioxide and nano-silver are compounded to form a nano-composite coating material, which can give full play to the advantages of both and significantly improve the antibacterial performance and self-cleaning ability of the floor scrubber.

[0024] In addition, an appropriate amount of nano-silica (SiO2) can be added according to actual needs to enhance the hardness and wear resistance of the coating, and improve the stability and service life of the coating.

[0025] Specifically, the nano-titanium dioxide is anatase type, with a particle size of 20 - 50nm, the nano-silver particle size is 10 - 30nm, and the nano-silica particle size is 10 - 40nm.

[0026] (1) Under light conditions, the anatase-type titanium dioxide coating can decompose the organic matter in the sewage tank 2 (such as carbohydrates in the residual sewage) into carbon dioxide and water, reduce the adhesion of dirt, and improve the anti-fouling property of the component surface by more than 60%.

[0027] The hydroxyl radicals (·OH) generated during the photocatalytic process can damage the bacterial DNA structure and cooperate with silver nanoparticles to achieve the dual effects of "photocatalytic antibacterial + contact sterilization", increasing the antibacterial rates of Escherichia coli and Staphylococcus aureus from 95% of single silver nanoparticles to 99.9%.

[0028] Titanium dioxide particles with a particle size of 20 - 50 nm have a larger specific surface area (≥50 m 2 / g). The coating per unit area can expose more catalytic active sites, and the photocatalytic efficiency is increased by more than 30% compared with particles with a particle size > 100 nm; the nanoparticles are easily dispersed in the slurry, avoiding coating defects caused by agglomeration, ensuring the coating density on the surfaces of complex structures such as the inner wall of the sewage tank 2, the sewage pipe 3, and the sewage suction port 4, and the corrosion resistance is increased by 55%.

[0029] (2)Nanoscale silver particles with a size of 10 - 30 nm can penetrate the bacterial cell membrane and release Ag + ions that bind to bacterial DNA and enzyme proteins, inhibiting their metabolic activities. The smaller the particle size, the larger the surface area per unit mass of silver particles, and the faster the release rate of Ag + ions. The antibacterial speed is increased by 40% compared with silver particles with a size above 50 nm; the inhibition rates for both Gram-positive bacteria (such as Staphylococcus aureus) and Gram-negative bacteria (such as Escherichia coli) are ≥99%, and it can effectively inhibit the growth of fungi (such as molds), solving the odor problem after long-term use of the sewage tank 2.

[0030] (3)Nanoscale silica particles with a size of 10 - 40 nm, as the "reinforcing phase", are uniformly dispersed in the titanium dioxide / silver matrix. Through the "nanoparticle filling effect", the hardness and wear resistance of the coating are improved, and the wear amount is reduced by 60%. The coating is not easily detached under complex environments such as the high-frequency vibration of the floor washer and sewage scouring, and the service life is extended by 1.5 times.

[0031] The hydrophilic surface of nanoscale silica can reduce the surface energy of the coating. Combining with the photocatalytic superhydrophilicity of silica, the water contact angle is reduced from 80° to below 30°, achieving the "self-cleaning" effect - solid particles (such as dust and sediment) in the sewage are more easily washed away with the water flow, reducing the frequency of manual disassembly and cleaning. Example Two

[0032] As Figure 2 shown, on the basis of Example One, the present invention also proposes a preparation method for the nanocomposite coating, including the following steps: S1. Prepare the tetrabutyl titanate solution: Add 10 mL of tetrabutyl titanate, 40 mL of absolute ethanol, and 8 mL of glacial acetic acid into a beaker and stir for 30 minutes at a rotation speed of 300 rpm to form a transparent and homogeneous tetrabutyl titanate solution (volume ratio 1:4:0.8).

[0033] S2. Preparation of silver nitrate solution: Dissolve 0.85 g of silver nitrate in 100 mL of deionized water to prepare a silver nitrate solution with a concentration of 0.05 mol / L.

[0034] S3. Sol preparation: Under magnetic stirring conditions (rotation speed 500 rpm), slowly drop the above silver nitrate solution into the tetrabutyl titanate solution in 3 portions (volume ratio 1:8). At the same time, add 2 g of nano-silica (particle size 20 nm, accounting for 2% of the total mass of the mixed solution), and continue stirring for 45 minutes to form a pale yellow transparent sol.

[0035] S4. Aging and gel formation: Transfer the sol to a sealed container and leave it to age statically in an incubator at 35 °C for 18 hours to form a translucent gel.

[0036] S5. Drying and calcination: Place the gel in an oven at 60 °C and dry for 24 hours to remove the solvent and obtain a dry gel. Subsequently, put the dry gel into a muffle furnace and heat it to 500 °C at a heating rate of 5 °C / min and calcine for 3 hours to obtain a white powdery nano-composite coating material (TiO2 / Ag / SiO2).

[0037] S6. Coating slurry preparation and coating: Mix 10 g of the above powder with 5 g of a silicon-acrylic resin binder and 85 g of ethanol, and ultrasonically disperse for 30 minutes to prepare a coating slurry with a solid content of 15%. Use air spraying (pressure 0.3 MPa) to evenly spray the slurry on the inner wall (PP plastic) surface of the sewage tank 2, and control the coating thickness to 10 μm. After spraying, cure at 80 °C for 2 hours to form a dense coating.

[0038] Among them, for the base coating without nano-silica, except that nano-silica is not added in step S3, the remaining preparation steps are the same as the above steps to obtain a TiO2 / Ag binary composite coating, which is coated on the inner surface of the sewage suction port 4 (NBR rubber), and the coating thickness is 15 μm. Example Three

[0039] On the basis of Example One and Example Two, the present invention also carried out coating performance testing and effect verification.

[0040] (1) Adhesion test: According to the cross-cut method of GB / T9286-1998, use a cutter with a 1 mm spacing to draw a 10×10 grid on the coating surface, stick a 3M tape, and then peel it off vertically. Among them, the adhesion of the nano-composite coating (TiO2 / Ag / SiO2) on the PP plastic surface is 97% (the peeling area ≤ 3%); the adhesion of the base coating (without nano-silica) on the NBR rubber surface is 96%, both meeting the requirement of "adhesion average value ≥ 95%".

[0041] (2) Anti-fouling test: Aqueous solution containing 1% methylene blue was dropped on the surface of the coating on the inner wall of the sewage tank 2, and after standing for 24 hours, it was rinsed with clean water. Obvious blue stains remained on the surface of the uncoated parts, while the stains on the surface of the nano-composite coating were completely removed, and the anti-fouling property was improved by 60% (compared with the uncoated parts).

[0042] (3) Abrasion resistance test: The surface of the coating was subjected to 500 friction tests using an abrasion resistance testing machine, and the thickness loss of the coating was measured. The thickness loss of the nano-composite coating was 1.2 μm, and the wear amount of the uncoated parts was 3.0 μm, and the abrasion resistance was improved by 60%.

[0043] (4) Corrosion resistance test: The coated parts were immersed in 5% hydrochloric acid solution for 24 hours, and the surface changes were observed. Obvious swelling and discoloration occurred on the surface of the uncoated PP plastic, while there were no obvious corrosion marks on the surface of the nano-composite coating, and the corrosion resistance was improved by 55%.

[0044] (5) Antibacterial performance test: The plate colony counting method was used to test the antibacterial rate of the coating against Escherichia coli and Staphylococcus aureus. After the nano-composite coating acted for 2 hours under light conditions, the antibacterial rate was ≥99.9%.

[0045] (6) Chemical cleaning solution consumption test: Under the same cleaning area (10 m 2 ) and stain conditions (mixed stains of soy sauce and cooking oil), the chemical cleaning solution consumption of the traditional floor washer and the floor washer of the present invention was compared: The traditional floor washer needed to use 50 mL of cleaning solution, while the floor washer of the present invention only needed 2 mL (the consumption was reduced by 96%). Based on the traditional consumption, the chemical cleaning solution consumption of the floor washer of the present invention was reduced to less than 5%.

[0046] Furthermore, the coating adaptation schemes for different parts are shown in the following table (where the substrate materials include, but are not limited to, PP plastic, NBR rubber, and EPDM rubber):

[0047] In summary, by coating the nano-composite coating on the surface of the key parts of the floor washer, the present invention has achieved the following technical effects: Improved cleaning efficiency: The anti-fouling property of the coating makes it difficult for impurities to adhere to the surface of the parts, reducing the frequency of manual disassembly and cleaning, and the cleaning efficiency is improved by about 20%; Antibacterial and self-cleaning: The broad-spectrum antibacterial property of nano-silver and the photocatalytic effect of titanium dioxide effectively inhibit the growth of bacteria (antibacterial rate ≥99%), and the odor in the sewage tank 2 is reduced by more than 80%; Enhanced durability: The abrasion resistance and corrosion resistance are improved (≥50%), and the service life of the parts is extended to 1.5 times that of the traditional floor washer; Environmental protection and energy saving: The chemical cleaning solution consumption is reduced to less than 5% of the traditional consumption, reducing chemical pollution and achieving green cleaning.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0050] Based on the inspiration of the ideal embodiments of the present invention as above, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A cleaning device with a nano-composite coating, comprising key components, characterized in that: The surface of the key component is coated with a nano-composite coating, the nano-composite coating includes nano-titanium dioxide and nano-silver, and the key component includes the inner wall of the sewage tank, the sewage suction port and the sewage pipe.

2. The cleaning device with a nano-composite coating according to claim 1, characterized in that: The nano-composite coating further includes nano-silica.

3. The cleaning device with a nano-composite coating according to claim 2, characterized in that: The nano-composite coating is prepared by the following steps: S1. Mix tetrabutyl titanate, absolute ethanol, and glacial acetic acid in a volume ratio of 1:(3 - 5):(0.5 - 1), and stir evenly to obtain a tetrabutyl titanate solution; S2. Dissolve silver nitrate in deionized water to prepare a silver nitrate solution with a concentration of 0.01 - 0.1 mol / L; S3. Under stirring conditions, slowly drop the silver nitrate solution in step S2 into the tetrabutyl titanate solution in step S1 in a volume ratio of 1:(5 - 10), and at the same time add nano-silica accounting for 1% - 5% of the total mass of the mixed solution, and continue to stir for 30 - 60 minutes to form a uniform sol; S4. Let the sol stand and age at 25 - 50 °C for 12 - 24 hours to form a gel; S5. After drying the gel at 60 - 80 °C for 12 - 24 hours, calcine it at 400 - 600 °C for 2 - 4 hours to obtain nano-composite coating material powder; S6. Mix the powder with a binder and a solvent to make a nano-coating slurry with a solid content of 10% - 30%, and coat it on the surface of the key component.

4. The cleaning device with a nano-composite coating according to claim 3, wherein: In step S6, the coating technique adopts spraying, dip coating or film coating, and the thickness of the coated coating is 5 - 20 μm.

5. The cleaning device with a nano-composite coating according to claim 2 or 3, characterized in that: In the nano-composite coating, the mass ratio of nano-titanium dioxide to nano-silver is (5 - 10):1, and the addition amount of nano-silica is 5% - 15% of the total mass of the nano-composite coating.

6. The cleaning device with a nano-composite coating according to claim 1, characterized in that: The surface material of the key component is made of plastic or rubber.

7. The cleaning device with a nano-composite coating according to claim 6, characterized in that: The average adhesion of the nano-composite coating to the surface of the key component is ≥95%.

8. The cleaning device with a nano-composite coating according to claim 2, characterized in that: The nano-titanium dioxide is anatase type, with a particle size of 20 - 50 nm, the nano-silver particle size is 10 - 30 nm, and the nano-silica particle size is 10 - 40 nm.

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