Etching method for stainless steel filter screen of vacuum cleaner and stainless steel filter screen of vacuum cleaner

Abstract

The present application relates to the field of new materials, and in particular to an etching method for a stainless steel filter screen for a vacuum cleaner and a stainless steel filter screen for a vacuum cleaner. An etching method for a stainless steel filter screen for a vacuum cleaner comprises the following steps: S1, leveling; S2, degreasing, cleaning, activation; S3, silk screen photosensitive ink; S4, spray etching; S5, deburring; S6, removing photosensitive ink; S7, coating a super-hydrophobic film: the stainless steel filter screen is placed in a super-hydrophobic liquid for 5-6 minutes, and then cured in a 130°C oven for 0.5h to obtain a stainless steel filter screen for a vacuum cleaner. The etching method and stainless steel filter screen for a vacuum cleaner of the present application have the advantages of high precision, super-hydrophobicity, reduced tension, improved silky performance, and stable and reliable production process, providing a high-efficiency and high-quality filter screen solution for the vacuum cleaner industry.

Description

Technical Field

[0001] The present application relates to the field of new materials, and in particular to an etching method for a stainless steel filter screen for a vacuum cleaner and a stainless steel filter screen for a vacuum cleaner. Background Art

[0002] Vacuum cleaner filters widely used on the market are mostly made of materials such as metal mesh and fiber mesh. While these filters offer good filtration performance, they are prone to clogging over time and require high cleaning and maintenance costs. Furthermore, the uneven pore size distribution of traditional filters results in low filtration efficiency and ineffective removal of fine dust and impurities. In recent years, with the advancement of micromachining technology, etching techniques have been increasingly used in the manufacture of high-precision filters, particularly those made of stainless steel. These filters offer advantages such as corrosion resistance, high strength, and long service life, but their production still faces numerous challenges. Currently, there are three main methods for producing stainless steel vacuum cleaner filters: Stamping: This method uses a die to stamp a metal sheet into the desired shape and pore size. While highly efficient, it struggles to achieve a highly precise pore size distribution and is prone to burrs, which can affect filtration performance. Chemical etching: This more advanced method uses a chemical solution to etch the metal sheet to create the desired pore size. This method can achieve high pore size consistency, but it places extremely high demands on chemical solution parameters such as concentration, temperature, and pressure, and even slight deviations can affect the quality of the finished product. Laser cutting method: Using laser beams to precisely cut metal sheets can achieve very high aperture accuracy. However, the cost of laser cutting is high and not suitable for large-scale production. These methods each have their own advantages and disadvantages, but none of them can completely solve the problem of high precision, low resistance, burr-free and super-hydrophobic surface of stainless steel filter screens.

[0003] In response to the shortcomings of the existing technology, the present application provides an etching method for a vacuum cleaner stainless steel filter and a vacuum cleaner stainless steel filter. By precisely controlling the surface flatness of the stainless steel substrate to ≤20 microns, degreasing, cleaning, activation, silk-screening photosensitive ink, spray etching and coating with a super-hydrophobic film, the vacuum cleaner stainless steel filter is obtained to have a high-precision mesh distribution, an average error in the etching aperture ≤0.01mm, and an average error in the side etching ≤0.01mm, ensuring that the filtering effect of the filter is significantly improved; it has super-hydrophobic properties, and its contact angle is greater than 150°, which can reduce the adhesion of dust and oil, and reduce the resistance of the filter; the pulling force is reduced by etching a circular hole process and etching the edge half-engraving; the burrs on the edge of the etched hole are removed by plasma, and the penetrating and silky performance of hair is improved. The etching method of the present application improves the stability and reliability of the production process and is suitable for large-scale production.

[0004] In a first aspect, the present application provides a method for etching a stainless steel filter screen for a vacuum cleaner, using the following technical solution:

[0005] A method for etching a stainless steel filter screen for a vacuum cleaner comprises the following steps:

[0006] S1. Leveling the stainless steel substrate. The surface flatness of the leveled stainless steel substrate is ≤ 20 μm.

[0007] S2. Degreasing, cleaning, and activation: The leveled stainless steel substrate is degreased and cleaned by high-pressure sputtering spraying with a degreasing cleaning solution at a cleaning speed of 6.5 m / s. The substrate is then cleaned by high-pressure sputtering spraying with deionized water. The substrate is again cleaned by high-pressure sputtering spraying with an activation solution to remove oxide scale. Finally, the substrate is cleaned by high-pressure sputtering spraying with deionized water to obtain a clean stainless steel substrate.

[0008] S3, screen printing photosensitive ink: After drying the clean surface of the stainless steel substrate, screen print the photosensitive ink according to the pre-designed pattern, then use 2000W ultraviolet heat energy 878Jr / s for primary photolysis exposure, and after development, use 9000W ultraviolet heat energy 2113Jr / s for secondary photolysis curing; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocuring Materials Co., Ltd.; S4, spray etching: The stainless steel substrate treated in step S3 is perforated and etched by spraying a high-pressure chemical etching solution at a temperature of 44-46°C. After etching, the surface is rinsed with deionized water and dried to obtain the etched stainless steel substrate;

[0009] S5, deburring: using plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate;

[0010] S6, removing the photosensitive ink: soaking the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80° C. to remove the photosensitive ink on the surface, then washing with deionized water and drying to obtain a stainless steel filter;

[0011] S7. Coating a super-hydrophobic film: placing the stainless steel filter in a super-hydrophobic liquid for 5-6 minutes, and then curing it in an oven at 130° C. for 0.5 h to obtain a vacuum cleaner stainless steel filter.

[0012] By adopting the above technical solution, S1, leveling treatment: By leveling the stainless steel substrate, ensure that its surface flatness is ≤20 microns, providing a good foundation for subsequent processes. S2, degreasing, cleaning and activation: Use high-pressure sputtering to spray degreasing cleaning solution and activation solution to degrease and remove oxide scale on the leveled stainless steel substrate to obtain a clean stainless steel substrate. This step helps to improve the adhesion between the photosensitive ink and the stainless steel substrate. S3, screen printing photosensitive ink: After drying the surface of the clean stainless steel substrate, screen print the photosensitive ink according to the pre-designed pattern, and then use ultraviolet light thermal energy for primary photolysis exposure and secondary photolysis curing. This step allows the photosensitive ink to form the desired pattern on the stainless steel substrate. S4, spray etching: Use high-pressure spraying of chemical etching solution with a temperature of 44-46°C to perform perforation etching on the stainless steel substrate treated in step S3. After etching, the surface is cleaned with deionized water and dried to obtain the etched stainless steel substrate. This step achieves high-precision etching of the stainless steel filter of the vacuum cleaner. S5. Deburring: Use plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate to improve the penetrating and silky performance of the hair. S6. Removal of photosensitive ink: Soak the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80°C to remove the surface photosensitive ink, then use deionized water to wash and dry it to obtain a stainless steel filter. This step removes the residual photosensitive ink and ensures the cleanliness of the product. S7. Coating of superhydrophobic film: Place the stainless steel filter in a superhydrophobic liquid for 5-6 minutes, then place it in a 130°C oven for curing for 0.5h to obtain a vacuum cleaner stainless steel filter. This step makes the vacuum cleaner stainless steel filter have superhydrophobic properties, reduces the adhesion of dust and oil, and reduces the resistance of the filter. In short, by precisely controlling the surface flatness of the stainless steel substrate to ≤20 microns, degreasing, cleaning, activation, silk-screening of photosensitive ink, spray etching and coating of a super-hydrophobic film and other processes, the vacuum cleaner stainless steel filter is obtained with a high-precision mesh distribution, the average error of the etching aperture is ≤0.01mm, and the average error of the side etching is ≤0.01mm, ensuring that the filtering effect of the filter is significantly improved; the burrs on the edge of the mesh are reduced, and the service life of the filter is extended; it has super-hydrophobic properties, and its contact angle is greater than 150°, which can reduce the adhesion of dust and oil, and reduce the resistance of the filter; the tension is reduced by etching round holes and half-etching the edges; the burrs on the edges of the etched holes are removed by plasma, and the penetration and silkiness of the hair are improved.

[0013] Preferably, in step S2, the degreasing cleaning solution is 65-70 g / L sodium hydroxide, the temperature is 70-90 ° C; the activation solution is 10-15 g / L ferric chloride, 10-12 g / L hydrochloric acid with a mass concentration of 37%, the temperature is 35-40 ° C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 .

[0014] Preferably, in step S4, the chemical etching solution comprises the following components: 720-750 g / L of ferric chloride, 180-200 g / L of accelerator, 80-90 g / L of inorganic acid, 15-18 g / L of chelating agent, and 6-8 g / L of stabilizer.

[0015] By employing the above technical solution, ferric chloride serves as the primary etchant. It oxidizes metallic elements such as iron and nickel on the stainless steel substrate, thereby dissolving these metals and achieving an etching effect. It works in conjunction with an accelerator to accelerate the etching reaction. Simultaneously, a chelating agent helps maintain the balance of metal ions in the solution, stabilizing the etching rate. The decomposition of thiourea peroxide and sodium persulfate in the accelerator releases reactive oxygen species, which further oxidize the stainless steel surface and enhance the etching effect. Combining this with ferric chloride improves etching efficiency. Furthermore, the sulfur in the accelerator helps precipitate heavy metal ions in the solution, maintaining solution cleanliness. Inorganic acids (nitric acid and hydrochloric acid): Nitric acid oxidizes metallic elements such as iron and nickel in stainless steel, accelerating the etching process. Hydrochloric acid helps dissolve chromium oxide, accelerating the etching rate of chromium. The inorganic acids, ferric chloride, and accelerator work together to accelerate the etching process and ensure the stability and efficiency of the etching solution. The chelating agent forms stable complexes with the iron, nickel, and chromium ions generated in the chemical etching solution, reducing the concentration of free metal ions in the solution. Through chelation, the stability of the etching solution is maintained, the accumulation of metal ions is prevented from affecting the etching effect, and the etching reaction is promoted to proceed in the forward direction. The stabilizer is used to maintain the stability of the chemical etching solution and prevent the solution from changing unnecessary during use. Working together with the chelating agent, it ensures the stability and consistency of the solution during the etching process, ensuring the etching accuracy and quality. In summary, the chemical etching solution in step S4 achieves efficient and accurate etching of the vacuum cleaner stainless steel filter through the synergistic effect of ferric chloride, accelerator, inorganic acid, chelating agent and stabilizer. This combination not only improves the etching efficiency, but also ensures the quality and performance of the product.

[0016] Preferably, the inorganic acid is composed of hydrochloric acid with a mass concentration of 37% and nitric acid with a mass concentration of 75% in a mass ratio of 1:1.

[0017] Using the above technical solution, the inorganic acid consists of 37% hydrochloric acid and 75% nitric acid in a 1:1 mass ratio. This combination plays a key role in the etching process, specifically in the following ways: It promotes the etching of stainless steel. Both hydrochloric acid and nitric acid are strong acids that react chemically with metallic elements such as iron and nickel in stainless steel, thereby promoting the etching of the stainless steel. Nitric acid, with its stronger oxidizing properties, oxidizes elements such as iron and nickel in stainless steel into their corresponding oxides, further promoting the etching reaction. Hydrochloric acid and nitric acid exhibit a synergistic effect during the etching process. On the one hand, nitric acid oxidizes elements such as iron and nickel in stainless steel into oxides, providing more reactants for hydrochloric acid. On the other hand, hydrochloric acid reacts with the oxides formed by nitric acid, accelerating the dissolution of the oxides and thus the etching rate. Furthermore, hydrochloric acid promotes the dissolution of chromium oxide, accelerating the etching of chromium. By adjusting the ratio of hydrochloric acid to nitric acid, the etching rate can be precisely controlled. A specific mass ratio of hydrochloric acid and nitric acid ensures sufficient etching capacity while avoiding the loss of precision caused by excessive etching rates. Chelating agent can chelate the iron ion, nickel ion and chromium ion generated in chemical etching solution, reduce the free metal ions in solution, and promote the etching reaction to proceed. And the combination of hydrochloric acid and nitric acid can maintain the pH value of etching solution to a certain extent, which is conducive to the effect of chelating agent. In summary, the inorganic acid (hydrochloric acid and nitric acid) combination adopted in this application plays an important role in the etching process of vacuum cleaner stainless steel filter screen, and they not only promote the etching of stainless steel, but also improve etching efficiency and precision by synergistic effect, while helping to maintain the stability of etching solution.

[0018] Preferably, the accelerator consists of thiourea peroxide and sodium persulfate in a mass ratio of 3:2.

[0019] By employing the above technical solution, thiourea peroxide and sodium persulfate serve as accelerators to accelerate the etching rate of stainless steel substrates using a chemical etching solution. Under acidic conditions, thiourea peroxide decomposes to produce reactive oxygen atoms, which react chemically with the stainless steel surface, accelerating the etching process. Sodium persulfate provides additional oxidizing power, further enhancing the etching effect. The reactive oxygen atoms produced by the decomposition of thiourea peroxide can oxidize heavy metal ions, such as iron and nickel ions, generated during the etching process to their corresponding high-valent states, which then form precipitates with other components in the solution. The formation of this precipitate helps reduce the concentration of free metal ions in the solution, promoting the forward etching reaction. The addition of a chelating agent further enhances the synergistic effect between thiourea peroxide and sodium persulfate. The chelating agent forms stable complexes with iron and nickel ions in the solution, reducing the activity of these metal ions and mitigating their impact on the stability of the etching solution. Furthermore, the chelating agent can increase the pH of the etching solution, facilitating the effective function of thiourea peroxide and sodium persulfate in acidic conditions. Since thiourea peroxide and sodium persulfate have high etching ability and good selectivity, they are very useful for precisely controlling the average error of etching aperture and side etching.

[0020] Preferably, the chelating agent is composed of diethylenetriaminepentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate in a mass ratio of 3:3:5.

[0021] By adopting the above technical solution, the chelating agent consists of diethylenetriaminepentaacetic acid (DTPA), potassium sodium tartrate, and trisodium methylamino acid diacetate in a mass ratio of 3:3:2. These components interact synergistically, improving the stability and etching efficiency of the etching solution. Diethylenetriaminepentaacetic acid (DTPA): DTPA is a powerful chelating agent that can form stable complexes with a variety of metal ions. During the etching process, DTPA effectively chelates iron, nickel, and chromium ions in the solution, reducing the free state of these metal ions and thus reducing their interference with the etching reaction. DTPA also improves the pH stability of the etching solution, helping to maintain a consistent etching rate. Potassium sodium tartrate is a commonly used buffer and chelating agent that forms soluble complexes with metal ions, helping to maintain the acid-base balance of the etching solution. During the etching process, potassium sodium tartrate neutralizes the generated hydrogen ions, preventing the solution from becoming overly acidic or overly alkaline, thereby maintaining the stability of the etching solution. Trisodium methylamino acid diacetate: This compound is also an effective chelating agent that can form stable complexes with metal ions. Its function is similar to DTPA, which can help chelate metal ions in the solution and reduce their free state, thereby reducing interference with the etching reaction. The combined use of these three chelating agents can achieve the following synergistic effects: Enhanced chelation: Different chelating agents have different affinities for different metal ions. Their combined use can improve the overall chelation effect and more effectively control the metal ion concentration in the solution. Improved etching solution stability: Through buffering and pH adjustment, the pH value of the etching solution is kept stable, which is conducive to the etching reaction. Promoted etching reaction: Chelating agents can reduce the interference of metal ions, making the etching reaction smoother and improving etching efficiency and accuracy. In summary, the combination of diethylenetriaminepentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate as chelating agents plays an important role in the etching process of vacuum cleaner stainless steel filters. Through their synergistic effect, efficient and precise etching effects are achieved.

[0022] Preferably, the stabilizer is 1,1,3,3-tetramethyldisiloxane.

[0023] Preferably, in step S4, the pressure of the high pressure spray is 4 kg / cm 2 The volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 15-18%.

[0024] By adopting the above technical solution, high-pressure spraying can provide sufficient impact force, allowing the chemical etching solution to penetrate deeper into the surface of the stainless steel substrate, thereby improving etching efficiency. At the same time, the presence of oxygen can promote the chemical reaction and further accelerate the etching rate. By adjusting the pressure and oxygen content of the high-pressure spray, precise control of the etching process can be achieved. Excessive pressure may lead to over-etching, while too low pressure may lead to insufficient etching. Similarly, controlling the oxygen content will also affect the etching speed and effect. Maintaining solution stability: After adding the chelating agent, the metal ions in the chemical etching solution will be chelated, reducing the free metal ions in the solution, promoting the etching reaction to proceed in the forward direction, and maintaining a stable etching rate of the etching solution. The presence of oxygen can help maintain this stable reaction environment. In summary, the pressure and oxygen content of the high-pressure spray play a key role in step S4. They not only improve the etching efficiency and accuracy, but also help maintain the stability of the solution, thereby achieving efficient and accurate etching of the vacuum cleaner stainless steel filter.

[0025] Preferably, in step S7, the preparation method of the superhydrophobic liquid is: 4.6 kg of hexadecyltriethoxysilane, 2.2 kg of heptafluorodecyltrimethoxysilane and 1.5 kg of perfluorooctyltriethoxysilane are added to a mixed solution consisting of 200 L of anhydrous isopropanol and 50 L of deionized water, and stirred at a stirring rate of 400 rpm for 60 min to obtain a superhydrophobic liquid.

[0026] By adopting the above technical solution, hexadecyltriethoxysilane: This is a commonly used organosilicon compound with excellent hydrophobicity and weather resistance. In superhydrophobic liquids, it can reduce the surface tension of the liquid, making it easier for the liquid to form beads on the surface, thus achieving a superhydrophobic effect. Heptadecafluorodecyltrimethoxysilane: This is a fluorine-containing organosilicon compound with excellent hydrophobicity and chemical corrosion resistance. In superhydrophobic liquids, it can synergize with hexadecyltriethoxysilane to further improve the liquid's hydrophobicity and durability. Perfluorooctyltriethoxysilane: This is also a fluorine-containing organosilicon compound with excellent hydrophobicity and chemical corrosion resistance. In superhydrophobic liquids, it can synergize with hexadecyltriethoxysilane and heptadecafluorodecyltrimethoxysilane to further improve the liquid's hydrophobicity, durability, and anti-fouling properties. A mixed solution of anhydrous isopropyl alcohol and deionized water: These two solvents can effectively dissolve the above three organosilicon compounds, making them evenly distributed in the solution. Furthermore, they can adjust the solution's viscosity and evaporation rate to suit different coating process requirements. In summary, the various components of the superhydrophobic liquid work synergistically to achieve a superhydrophobic treatment of the stainless steel vacuum cleaner filter. This treatment not only improves the filter's filtration efficiency and reduces the adhesion of dust and oil, but also reduces filter resistance, improving the smooth penetration of hair.

[0027] In a second aspect, the present application provides a stainless steel filter for a vacuum cleaner, which adopts the following technical solution:

[0028] As a general technical concept, the present application also provides a vacuum cleaner stainless steel filter screen prepared by the above-mentioned vacuum cleaner stainless steel filter screen preparation method, wherein the thickness of the stainless steel filter screen is 0.2 mm, and the mesh of the stainless steel filter screen is composed of evenly distributed circular holes and adjacent semicircular holes, and the density of the circular holes and adjacent semicircular holes is 40096 / m 2 The diameters of the circular holes and semicircular holes are both 0.23-0.25 mm.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. High-precision etching: By precisely controlling the surface flatness of the stainless steel substrate to ≤20 microns and perforating the stainless steel substrate with a high-pressure spray chemical etching solution, a high-precision mesh distribution is achieved. The average error in the etched aperture is ≤0.01mm, and the average error in the side etching is ≤0.01mm, significantly improving the filter's filtration performance.

[0031] 2. Super-hydrophobicity: By coating the stainless steel filter with a super-hydrophobic film, the vacuum cleaner's stainless steel filter becomes super-hydrophobic, with a contact angle greater than 150°. This super-hydrophobicity effectively reduces the adhesion of dust, oil, and other substances, thereby reducing the resistance of the filter and improving the efficiency of the vacuum cleaner.

[0032] 3. Reduced tension and improved smoothness: Through the use of circular hole etching and semi-etched edges, tension is reduced, preventing deformation or damage to the filter caused by excessive tension. At the same time, plasma is used to remove burrs on the edges of the etched holes, improving the smooth penetration of hair and further enhancing the user experience of the vacuum cleaner.

[0033] 4. Improve the stability and reliability of the production process: The etching method of this application has been carefully designed and optimized to improve the stability and reliability of the production process. This stable production process is suitable for large-scale production, helping to reduce production costs and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings used in the embodiments: Figure 1 This is a physical picture of the stainless steel filter screen for vacuum cleaner prepared in Example 1. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail below with reference to the examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0036] Example 1

[0037] A method for etching a stainless steel filter screen for a vacuum cleaner comprises the following steps:

[0038] S1. Leveling a stainless steel substrate with a thickness of 0.2 mm. The surface flatness of the leveled stainless steel substrate is ≤ 20 μm.

[0039] S2. Degreasing, cleaning, and activation: The leveled stainless steel substrate is degreasing and cleaning with a high-pressure sputtering spray of a degreasing cleaning solution at a cleaning speed of 6.5 m / s, and then cleaning with a high-pressure sputtering spray of deionized water. The substrate is again cleaned with a high-pressure sputtering spray of an activation solution to remove oxide scales, and finally cleaning with a high-pressure sputtering spray of deionized water to obtain a clean stainless steel substrate. The degreasing cleaning solution is 65 g / L sodium hydroxide at a temperature of 90°C; the activation solution is 10 g / L ferric chloride and 10 g / L hydrochloric acid with a mass concentration of 37% at a temperature of 40°C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 ;

[0040] S3, screen printing photosensitive ink: After drying the clean stainless steel substrate surface, screen print the photosensitive ink according to the pre-designed pattern, and then use 2000W ultraviolet light heat energy 878Jr / s for primary photolysis exposure, and then use 9000W ultraviolet light heat energy 2113Jr / s for secondary photolysis curing after development; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocuring Materials Co., Ltd.; S4, spray etching: use 4kg / cm 2 The stainless steel substrate treated in step S3 is subjected to perforation etching by using a chemical etching solution with a high-pressure spray temperature of 44° C. After etching, the surface is cleaned with deionized water and dried to obtain an etched stainless steel substrate; the chemical etching solution comprises the following components: 720 g / L of ferric chloride, 180 g / L of an accelerator, 80 g / L of an inorganic acid, 15 g / L of a chelating agent, and 6 g / L of 1,1,3,3-tetramethyldisiloxane, wherein the inorganic acid is composed of hydrochloric acid with a mass concentration of 37% and nitric acid with a mass concentration of 75% in a mass ratio of 1:1, the accelerator is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2, and the chelating agent is composed of diethylenetriaminepentaacetic acid, potassium sodium tartrate, and trisodium methylamino acid diacetate in a mass ratio of 3:3:5; the volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 15%.

[0041] S5, deburring: using plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate;

[0042] S6, removing the photosensitive ink: soaking the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80° C. to remove the photosensitive ink on the surface, then washing with deionized water and drying to obtain a stainless steel filter;

[0043] S7. Coating a super-hydrophobic film: Place the stainless steel filter in a super-hydrophobic liquid for 5 minutes, and then place it in an oven at 130°C for curing for 0.5h to obtain a vacuum cleaner stainless steel filter; the preparation method of the super-hydrophobic liquid is as follows: 4.6kg of hexadecyltriethoxysilane, 2.2kg of heptafluorodecyltrimethoxysilane and 1.5kg of perfluorooctyltriethoxysilane are added to a mixed solution consisting of 200L of anhydrous isopropanol and 50L of deionized water, and stirred at a stirring rate of 400 rpm for 60min to obtain a super-hydrophobic liquid.

[0044] The obtained vacuum cleaner stainless steel filter is as follows Figure 1 As shown, the thickness of the stainless steel filter is 0.2 mm, and the mesh of the stainless steel filter consists of evenly distributed circular holes and adjacent semicircular holes, and the density of the circular holes and adjacent semicircular holes is 40096 / m 2 The diameters of the circular holes and semicircular holes are both 0.23-0.25 mm.

[0045] Example 2

[0046] A method for etching a stainless steel filter screen for a vacuum cleaner comprises the following steps:

[0047] S1. Leveling a 0.2 mm stainless steel substrate. The surface flatness of the leveled stainless steel substrate is ≤ 20 μm.

[0048] S2. Degreasing, cleaning, and activation: The leveled stainless steel substrate is degreasing and cleaning with a high-pressure sputtering spray of a degreasing cleaning solution at a cleaning speed of 6.5 m / s, and then cleaning with a high-pressure sputtering spray of deionized water. The substrate is again cleaned with a high-pressure sputtering spray of an activation solution to remove oxide scales, and finally cleaning with a high-pressure sputtering spray of deionized water to obtain a clean stainless steel substrate. The degreasing cleaning solution is 70 g / L sodium hydroxide at a temperature of 70°C; the activation solution is 15 g / L ferric chloride and 12 g / L hydrochloric acid with a mass concentration of 37% at a temperature of 35°C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 ;

[0049] S3, screen printing photosensitive ink: After drying the clean stainless steel substrate surface, screen print the photosensitive ink according to the pre-designed pattern, and then use 2000W ultraviolet light heat energy 878Jr / s for primary photolysis exposure, and then use 9000W ultraviolet light heat energy 2113Jr / s for secondary photolysis curing after development; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocuring Materials Co., Ltd.; S4, spray etching: use 4kg / cm 2 The stainless steel substrate treated in step S3 is subjected to perforation etching by using a chemical etching solution with a high-pressure spray temperature of 46° C. After etching, the surface is cleaned with deionized water and dried to obtain an etched stainless steel substrate; the chemical etching solution comprises the following components: 750 g / L of ferric chloride, 200 g / L of an accelerator, 90 g / L of an inorganic acid, 18 g / L of a chelating agent, and 8 g / L of 1,1,3,3-tetramethyldisiloxane, wherein the inorganic acid is composed of hydrochloric acid with a mass concentration of 37% and nitric acid with a mass concentration of 75% in a mass ratio of 1:1, the accelerator is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2, and the chelating agent is composed of diethylenetriaminepentaacetic acid, potassium sodium tartrate, and trisodium methylamino acid diacetate in a mass ratio of 3:3:5; the volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 18%.

[0050] S5, deburring: using plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate;

[0051] S6, removing the photosensitive ink: soaking the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80° C. to remove the photosensitive ink on the surface, then washing with deionized water and drying to obtain a stainless steel filter;

[0052] S7. Coating a super-hydrophobic film: Place the stainless steel filter in a super-hydrophobic liquid for 6 minutes, and then place it in an oven at 130°C for curing for 0.5h to obtain a vacuum cleaner stainless steel filter; the preparation method of the super-hydrophobic liquid is as follows: 4.6kg of hexadecyltriethoxysilane, 2.2kg of heptadecafluorodecyltrimethoxysilane and 1.5kg of perfluorooctyltriethoxysilane are added to a mixed solution consisting of 200L of anhydrous isopropanol and 50L of deionized water, and stirred at a stirring rate of 400 rpm for 60min to obtain a super-hydrophobic liquid.

[0053] Example 3

[0054] A method for etching a stainless steel filter screen for a vacuum cleaner comprises the following steps:

[0055] S1. Leveling a 0.2 mm stainless steel substrate. The surface flatness of the leveled stainless steel substrate is ≤ 20 μm.

[0056] S2. Degreasing, cleaning, and activation: The leveled stainless steel substrate is degreasing and cleaning with a high-pressure sputtering spray of a degreasing cleaning solution at a cleaning speed of 6.5 m / s, and then cleaning with a high-pressure sputtering spray of deionized water. The substrate is again cleaned with a high-pressure sputtering spray of an activation solution to remove the oxide scale, and finally cleaning with a high-pressure sputtering spray of deionized water to obtain a clean stainless steel substrate; the degreasing cleaning solution is 68 g / L sodium hydroxide at a temperature of 80°C; the activation solution is 13 g / L ferric chloride and 11 g / L hydrochloric acid with a mass concentration of 37% at a temperature of 37°C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 ;

[0057] S3, screen printing photosensitive ink: After drying the clean stainless steel substrate surface, screen print the photosensitive ink according to the pre-designed pattern, and then use 2000W ultraviolet light heat energy 878Jr / s for primary photolysis exposure, and then use 9000W ultraviolet light heat energy 2113Jr / s for secondary photolysis curing after development; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocuring Materials Co., Ltd.; S4, spray etching: use 4kg / cm 2 The stainless steel substrate treated in step S3 is subjected to perforation etching by using a chemical etching solution with a high-pressure spray temperature of 45° C. After etching, the surface is cleaned with deionized water and dried to obtain an etched stainless steel substrate; the chemical etching solution comprises the following components: 730 g / L of ferric chloride, 190 g / L of an accelerator, 85 g / L of an inorganic acid, 17 g / L of a chelating agent, and 7 g / L of 1,1,3,3-tetramethyldisiloxane, wherein the inorganic acid is composed of hydrochloric acid with a mass concentration of 37% and nitric acid with a mass concentration of 75% in a mass ratio of 1:1, the accelerator is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2, and the chelating agent is composed of diethylenetriaminepentaacetic acid, potassium sodium tartrate, and trisodium methylamino acid diacetate in a mass ratio of 3:3:5; the volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 17%.

[0058] S5, deburring: using plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate;

[0059] S6, removing the photosensitive ink: soaking the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80° C. to remove the photosensitive ink on the surface, then washing with deionized water and drying to obtain a stainless steel filter;

[0060] S7. Coating a super-hydrophobic film: The stainless steel filter was placed in a super-hydrophobic liquid for 5.5 minutes, and then cured in an oven at 130°C for 0.5 hours to obtain a vacuum cleaner stainless steel filter; the super-hydrophobic liquid was prepared by adding 4.6 kg of hexadecyltriethoxysilane, 2.2 kg of heptafluorodecyltrimethoxysilane and 1.5 kg of perfluorooctyltriethoxysilane to a mixed solution consisting of 200 L of anhydrous isopropanol and 50 L of deionized water, and stirring at a stirring rate of 400 rpm for 60 minutes to obtain a super-hydrophobic liquid.

[0061] Comparative Example 1

[0062] The same as Example 3, except that: in step S4, the inorganic acid is hydrochloric acid with a mass concentration of 37%.

[0063] Comparative Example 2

[0064] The same as Example 3, except that: in step S4, the inorganic acid is nitric acid with a mass concentration of 75%.

[0065] Comparative Example 3

[0066] The same as Example 3, except that: in step S4, the accelerator is thiourea peroxide.

[0067] Comparative Example 4

[0068] The same as Example 3, except that: in step S4, the accelerator is sodium persulfate.

[0069] Comparative Example 5

[0070] The same as Example 3, except that: in step S4, the chelating agent is diethylenetriaminepentaacetic acid.

[0071] Comparative Example 6

[0072] The same as Example 3, except that: in step S4, the chelating agent is potassium sodium tartrate.

[0073] Comparative Example 7

[0074] The same as Example 3, except that: in step S4, the chelating agent is trisodium methylamino acid diacetate.

[0075] Comparative Example 8

[0076] The same as embodiment 3, except that step S7 is not implemented.

[0077] Detection test

[0078] Ten samples of the vacuum cleaner stainless steel filter prepared in Examples 1 to 3 and Comparative Examples 1 to 8 were taken respectively, and the aperture and the size of the hole side etching at 10 locations of the sample were randomly tested using a QV imager of Japan's Mitutoyo model QV-X302P12-C. The average error of the etched aperture and the average error of the hole side etching were calculated. The test results are shown in Table 1.

[0079] Contact angle: The contact angle meter SDC-100 was used for testing. The test results are shown in Table 1.

[0080] For the tensile test, a tensile testing machine is used to insert a hair into the hole of the stainless steel filter and pull it from the beginning to the end. Ten random test points of the sample are qualified only if the tensile force displayed is within 0.02N.

[0081] Table 1 Test results

[0082]

[0083]

[0084] Analyzing the data in Table 1, we can see that:

[0085] 1) The vacuum cleaner stainless steel filter provided in Examples 1-3 has a high-precision mesh distribution, with an average error in the etched aperture of ≤0.01mm and an average error in the side etching of ≤0.01mm, ensuring a significantly improved filtration effect. It has super-hydrophobic properties, with a contact angle greater than 150°, which can reduce the adhesion of dust and oil, reducing the resistance of the filter. It reduces tension by etching circular holes and etching the edges halfway. It uses plasma to remove burrs from the edges of the etched holes, improving the penetration and silkiness of hair. The etching method of this application improves the stability and reliability of the production process and is suitable for large-scale production.

[0086] 2) A comparative analysis of the etching accuracy of the stainless steel vacuum cleaner filters prepared in Example 3 and Comparative Examples 1 and 2 shows that the inorganic acid, composed of 37% hydrochloric acid and 75% nitric acid in a 1:1 mass ratio, can achieve sufficient etching performance while avoiding the reduction in accuracy caused by excessive etching rate. This synergistic effect not only promotes the etching of stainless steel but also improves etching efficiency and accuracy through synergy, while also helping to maintain the stability of the etching solution.

[0087] 3) A comparative analysis of the etching accuracy of stainless steel vacuum cleaner filters prepared in Example 3 and Comparative Examples 3 and 4 demonstrates that the accelerator, composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2, can accelerate the etching rate of stainless steel substrates using a chemical etching solution through synergistic effects. Due to their high etching efficiency and good selectivity, thiourea peroxide and sodium persulfate are particularly useful for precisely controlling the average error of the etched aperture and side etching.

[0088] 4) A comparative analysis of the etching accuracy of the vacuum cleaner stainless steel filter prepared in combination with Example 3 and Comparative Examples 5-7 shows that the chelating agent is composed of diethylenetriamine pentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate in a mass ratio of 3:3:5. There is a synergistic effect between these components, which together improves the stability and etching efficiency of the etching solution. Different chelating agents have different affinities for different metal ions. Their combined use can improve the overall chelating effect and more effectively control the metal ion concentration in the solution. Through buffering and pH adjustment, the pH of the etching solution is kept stable, which is conducive to the progress of the etching reaction. Promote etching reaction: Chelating agents can reduce the interference of metal ions, make the etching reaction smoother, and improve etching efficiency and accuracy.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the above embodiments provide a detailed description of the present application, relevant technical personnel should understand that the specific implementation methods of the present application may still be modified or replaced by equivalents. Any modifications and equivalent replacements that do not depart from the spirit and scope of the present application should be included in the scope of protection of the present application.

Claims

1. A method for etching a stainless steel filter screen for a vacuum cleaner, characterized in that: The following steps are involved: S1. Leveling: The stainless steel substrate is leveled, and the surface flatness of the stainless steel substrate after leveling is ≤20 microns; S2. Degreasing, cleaning, and activation: The leveled stainless steel substrate is degreasing and cleaning with a high-pressure sputtering spray of a degreasing cleaning solution at a cleaning speed of 6.5 m / s, followed by high-pressure sputtering spraying of deionized water for cleaning, and again by high-pressure sputtering spraying of an activation solution to remove oxide scale. Finally, high-pressure sputtering spraying of a deionized water solution is performed to obtain a clean stainless steel substrate; wherein the degreasing cleaning solution is 65-70 g / L of sodium hydroxide at a temperature of 70-90°C; the activation solution is 10-15 g / L of ferric chloride and 10-12 g / L of 37% hydrochloric acid at a temperature of 35-40°C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 ; S3, screen printing photosensitive ink: After drying the clean stainless steel substrate surface, screen print the photosensitive ink according to the pre-designed pattern, and then use 2000W UV heat energy 878Jr / s for the first photolysis exposure. After development, it is then subjected to secondary photolysis curing with 9000W UV heat energy 2113Jr / s. S4, spray etching: The stainless steel substrate treated in step S3 is subjected to perforation etching by spraying a chemical etching solution at a high pressure temperature of 44-46°C. After etching, the surface is cleaned with deionized water and dried to obtain the etched stainless steel substrate; wherein the chemical etching solution comprises the following components: 720-750 g / L of ferric chloride, 180-200 g / L of accelerator, 80-90 g / L of inorganic acid, and 15-18 g / L of chelating agent. , stabilizer 6-8g / L; the inorganic acid is composed of hydrochloric acid with a mass concentration of 37% and nitric acid with a mass concentration of 75% in a mass ratio of 1:1; the accelerator is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2; the chelating agent is composed of diethylenetriamine pentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate in a mass ratio of 3:3:5; the stabilizer is 1,1,3,3-tetramethyldisiloxane; the pressure of the high-pressure spray is 4kg / cm 2 The volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 15-18%; S5, deburring: using plasma to remove burrs on the edges of the etched holes on the etched stainless steel substrate; S6, removing the photosensitive ink: soaking the stainless steel substrate treated in step S5 in a 5% sodium hydroxide solution at a temperature of 80° C. to remove the photosensitive ink on the surface, then washing with deionized water and drying to obtain a stainless steel filter; S7. Coating a super-hydrophobic film: Place the stainless steel filter in a super-hydrophobic liquid for 5-6 minutes, and then place it in an oven at 130°C for curing for 0.5h to obtain a vacuum cleaner stainless steel filter; the preparation method of the super-hydrophobic liquid is as follows: 4.6kg of hexadecyltriethoxysilane, 2.2kg of heptafluorodecyltrimethoxysilane and 1.5kg of perfluorooctyltriethoxysilane are added to a mixed solution consisting of 200L of anhydrous isopropanol and 50L of deionized water, and stirred at a stirring rate of 400 rpm for 60min to obtain a super-hydrophobic liquid.

2. A stainless steel filter for a vacuum cleaner, characterized in that: The stainless steel filter screen of the vacuum cleaner is made by the etching method of claim 1, wherein the thickness of the stainless steel filter screen is 0.2 mm, and the mesh of the stainless steel filter screen is composed of evenly distributed circular holes and adjacent semicircular holes, and the density of the circular holes and adjacent semicircular holes is 40096 / m 2 The diameters of the circular holes and semicircular holes are both 0.23-0.25 mm.

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