Etching method for stainless steel filter screen of dust collector and stainless steel filter screen of dust collector

Abstract

The invention relates to the field of new materials, in particular to a dust collector stainless steel filter screen etching method and a dust collector stainless steel filter screen. The invention discloses an etching method for a stainless steel filter screen of a dust collector. The etching method comprises the following steps: S1, leveling; s2, removing oil, cleaning and activating; s3, silk-screen printing of photosensitive ink; s4, spraying and etching; s5, deburring is conducted; s6, removing the photosensitive ink; and S7, coating a super-hydrophobic membrane: putting the stainless steel filter screen into the super-hydrophobic liquid to be treated for 5-6 minutes, and then putting the treated stainless steel filter screen into an oven at 130 DEG C to be cured for 0.5 hour, so as to prepare the stainless steel filter screen of the dust collector. The etching method and the stainless steel filter screen of the dust collector have the advantages of being high in precision, super-hydrophobic, capable of reducing tension and improving the smoothness, stable and reliable in production process and the like, and an efficient and high-quality filter screen solution is provided for the dust collector 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] At present, the widely used vacuum cleaner filters on the market are mostly made of metal mesh, fiber mesh and other materials. Although these filters have good filtering effects, they are easy to clog during long-term use, and the cleaning and maintenance costs are high. In addition, the pore size distribution of traditional filters is uneven, resulting in low filtration efficiency and inability to effectively remove fine dust and impurities. In recent years, with the development of micromachining technology, etching technology has been increasingly used in the manufacture of high-precision filters, especially stainless steel filters. This filter has the advantages of corrosion resistance, high strength and long service life, but it still faces many challenges in the preparation process. At present, there are three main ways to prepare stainless steel filters for vacuum cleaners: Stamping method: This method uses a mold to stamp a metal sheet into the required shape and pore size. Although the production efficiency is high, it is difficult to achieve a high-precision pore size distribution, and it is easy to produce burrs, which affects the filtering effect. Chemical etching method: This is a more advanced method that uses chemical liquid to corrode the metal sheet to form the required pore size. This method can achieve a high consistency in pore size, but it has extremely high requirements for parameters such as the concentration, temperature, and pressure of the liquid, and a slight deviation will affect the quality of the finished product. Laser cutting method: Using laser beam to accurately 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 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. Invention content In view of the shortcomings of the prior art, 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 of photosensitive ink, spray etching and coating of a super-hydrophobic film and other processes, the vacuum cleaner stainless steel filter has 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; 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 etching hole are removed by plasma to improve the penetration and silkiness of the hair. The etching method of the present application improves the stability and reliability of the production process and is suitable for large-scale production.

[0003] In a first aspect, the present application provides a method for etching a stainless steel filter screen of a vacuum cleaner, using the following technical solution: A method for etching a stainless steel filter screen of a vacuum cleaner comprises the following steps: S1. The stainless steel substrate is leveled, and the surface flatness of the leveled stainless steel substrate is ≤20 μm; S2, degreasing, cleaning and activation: the leveled stainless steel substrate is degreasing and cleaned by high-pressure sputtering spraying degreasing cleaning solution at a cleaning speed of 6.5 m / s, then high-pressure sputtering spraying deionized water for cleaning, high-pressure sputtering spraying activation liquid again to remove oxide scale, and finally high-pressure sputtering spraying deionized water for cleaning to obtain a clean stainless steel substrate; 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, and then use 2000W ultraviolet heat energy 878Jr / s for the first photolysis exposure, and then use 9000W ultraviolet heat energy 2113Jr / s for secondary photolysis curing after development; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocurable Materials Co., Ltd.; S4, spray etching: the stainless steel substrate treated in step S3 is perforated and etched by spraying a chemical etching liquid with 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; S5, deburring: using plasma to remove burrs on the edges of the etched holes of 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 0.5 h to obtain a vacuum cleaner stainless steel filter.

[0004] By adopting the above technical scheme, 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 liquid to degreasing and remove the oxide scale of 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 enables the photosensitive ink to form the desired pattern on the stainless steel substrate. S4, spray etching: the stainless steel substrate treated in step S3 is perforated and etched by high-pressure spraying of chemical etching liquid at a temperature of 44-46°C. 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 penetration and silkiness 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 wash it with deionized water 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 an oven at 130°C 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 super-hydrophobic film and other processes, the vacuum cleaner stainless steel filter has 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 pulling force is reduced by etching round holes and half-etching the edges; the burrs on the edges of the etched holes are removed by plasma to improve the penetration and silkiness of the hair.

[0005] Preferably, in step S2, the degreasing cleaning solution is 65-70 g / L sodium hydroxide at a temperature of 70-90°C; the activation solution is 10-15 g / L ferric chloride and 10-12 g / L hydrochloric acid with a mass concentration of 37% at a temperature of 35-40°C; the spraying pressure of the high-pressure sputtering spray is 2.5 kg / cm 2 .

[0006] 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.

[0007] By adopting the above technical solution, ferric chloride is used as the main etchant. Ferric chloride can oxidize metal elements such as iron and nickel on the stainless steel substrate, thereby dissolving these metals and achieving the etching effect. It works together with the promoter to accelerate the etching reaction. At the same time, the chelating agent helps maintain the balance of metal ions in the solution and stabilize the etching rate. The thiourea peroxide and sodium persulfate in the promoter decompose to release active oxygen, which can further oxidize the stainless steel surface and enhance the etching effect. It is used in conjunction with ferric chloride to improve the etching efficiency. In addition, the sulfur element in the promoter helps to precipitate heavy metal ions in the solution and maintain the cleanliness of the solution. Inorganic acid (nitric acid and hydrochloric acid): Nitric acid can oxidize metal elements such as iron and nickel in stainless steel and promote the etching process. Hydrochloric acid helps to dissolve chromium oxide and speed up the etching rate of chromium. Inorganic acid works together with ferric chloride and promoters to accelerate the etching process of stainless steel and ensure the stability and efficiency of the etching solution. Chelating agents can form stable complexes with iron ions, nickel ions and chromium ions generated in the chemical etching solution to reduce 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 unnecessary changes in the solution during use. Working together with the chelating agent, the stability and consistency of the solution during the etching process are ensured, and the etching accuracy and quality are guaranteed. In summary, the chemical etching solution in step S4 achieves efficient and accurate etching of the stainless steel filter of the vacuum cleaner 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.

[0008] 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.

[0009] By adopting the above technical solution, 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. This combination plays a key role in the etching process, which is specifically manifested in the following aspects: Promoting the etching of stainless steel: hydrochloric acid and nitric acid are both strong acids, which can react chemically with metal elements such as iron and nickel in stainless steel, thereby promoting the etching of stainless steel. Among them, nitric acid has stronger oxidizing properties, which can oxidize elements such as iron and nickel in stainless steel into corresponding oxides, further promoting the etching reaction. Hydrochloric acid and nitric acid have a synergistic effect in the etching process. On the one hand, nitric acid can oxidize elements such as iron and nickel in stainless steel into oxides, providing more reactants for hydrochloric acid; on the other hand, hydrochloric acid can react with oxides generated by nitric acid, accelerating the dissolution of oxides, thereby accelerating the etching speed. In addition, hydrochloric acid can also promote the dissolution of chromium oxide and accelerate the etching of chromium. By adjusting the ratio of hydrochloric acid and nitric acid, precise control of the etching rate can be achieved. Hydrochloric acid and nitric acid are composed in a specific mass ratio, which can not only ensure sufficient etching ability, but also avoid the reduction of precision caused by excessive etching rate. Chelating agent can chelate the iron ions, nickel ions and chromium ions generated in the chemical etching solution, reduce the free metal ions in the solution, and promote the etching reaction to proceed in the forward direction. The combination of hydrochloric acid and nitric acid can maintain the pH value of the etching solution to a certain extent, which is conducive to the effect of the chelating agent. In summary, the inorganic acid (hydrochloric acid and nitric acid) combination used in this application plays an important role in the etching process of the stainless steel filter screen of the vacuum cleaner. They not only promote the etching of stainless steel, but also improve the etching efficiency and precision through synergy, while helping to maintain the stability of the etching solution.

[0010] Preferably, the accelerator consists of thiourea peroxide and sodium persulfate in a mass ratio of 3:2.

[0011] By adopting the above technical solution, thiourea peroxide and sodium persulfate are used as promoters to accelerate the etching speed of the chemical etching solution on the stainless steel substrate. Under acidic conditions, thiourea peroxide decomposes to produce active oxygen atoms, which react chemically with the surface of stainless steel to accelerate the etching process; while sodium persulfate can provide additional oxidation capacity to further enhance the etching effect. The active oxygen atoms produced by the decomposition of thiourea peroxide can oxidize heavy metal ions such as iron ions and nickel ions produced during the etching process into corresponding high-valent states, and then form precipitates with other components in the solution. The formation of this precipitate helps to reduce the concentration of free metal ions in the solution and promote the forward etching reaction. After adding the chelating agent, the synergistic effect between thiourea peroxide and sodium persulfate is more obvious. The chelating agent can form a stable complex with iron ions, nickel ions, etc. in the solution, thereby reducing the activity of these metal ions and slowing down their influence on the stability of the etching solution. At the same time, the chelating agent can also increase the pH value of the etching solution, which is conducive to the role of thiourea peroxide and sodium persulfate under acidic conditions. Since thiourea peroxide and sodium persulfate have high etching ability and good selectivity, they are very useful for accurately controlling the average error of etching aperture and side etching.

[0012] 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.

[0013] By adopting the above technical solution, the chelating agent is composed of diethylenetriaminepentaacetic acid (DTPA), potassium sodium tartrate and trisodium methylamino acid diacetate in a mass ratio of 3:3:2. There is a synergistic effect between these components, which jointly improves 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 can effectively chelate iron ions, nickel ions and chromium ions in the solution, reduce the free state of these metal ions, and thus reduce their interference with the etching reaction. In addition, DTPA can also improve the pH stability of the etching solution and help maintain the consistency of the etching rate. Potassium sodium tartrate is a commonly used buffer and chelating agent that can form a soluble complex with metal ions to help maintain the acid-base balance of the etching solution. During the etching process, potassium sodium tartrate can neutralize the generated hydrogen ions to prevent the solution from being 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 a stable complex with metal ions. Its effect 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. The combined use can improve the overall chelation effect and more effectively control the concentration of metal ions in the solution. Improve the stability of the etching solution: Through buffering and pH adjustment, the pH of the etching solution is kept stable, which is conducive to 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. In summary, the combination of diethylenetriaminepentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate as a chelating agent plays an important role in the etching process of the stainless steel filter of the vacuum cleaner. Through their synergistic effect, efficient and accurate etching effects are achieved.

[0014] Preferably, the stabilizer is 1,1,3,3-tetramethyldisiloxane.

[0015] 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%.

[0016] By adopting the above technical solution, high-pressure spraying can provide sufficient impact force, so that the chemical etching solution can penetrate deeper into the surface of the stainless steel substrate, thereby improving the etching efficiency. At the same time, the presence of oxygen can promote the chemical reaction and further accelerate the etching speed. By adjusting the pressure and oxygen content of the high-pressure spray, precise control of the etching process can be achieved. Too high pressure may lead to over-etching, while too low pressure may lead to insufficient etching. Similarly, the control of oxygen content will also affect the speed and effect of etching. Keep the solution stable: After adding the chelating agent, the metal ions in the chemical etching solution will be chelated, reducing the free metal ions in the solution, prompting the etching reaction to proceed in the forward direction, and maintaining the 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 to maintain the stability of the solution, thereby achieving efficient and accurate etching of the stainless steel filter of the vacuum cleaner.

[0017] Preferably, in step S7, the preparation method of the super hydrophobic liquid is: 4.6 kg of hexadecyltriethoxysilane, 2.2 kg of heptadecafluorodecyltrimethoxysilane 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 super hydrophobic liquid.

[0018] By adopting the above technical scheme, hexadecyltriethoxysilane: This is a commonly used organosilicon compound with good hydrophobicity and weather resistance. In super-hydrophobic liquid, it can reduce the surface tension of the liquid, making it easier for the liquid to form beads on the surface, thereby achieving a super-hydrophobic effect. Heptafluorodecyltrimethoxysilane: This is an organosilicon compound containing fluorine elements, which has excellent hydrophobicity and chemical corrosion resistance. In super-hydrophobic liquid, it can synergize with hexadecyltriethoxysilane to further improve the hydrophobicity and durability of the liquid. Perfluorooctyltriethoxysilane: This is also an organosilicon compound containing fluorine elements, which has excellent hydrophobicity and chemical corrosion resistance. In super-hydrophobic liquid, it can synergize with hexadecyltriethoxysilane and heptafluorodecyltrimethoxysilane to further improve the hydrophobicity, durability and anti-pollution of the liquid. A mixed solution composed of anhydrous isopropyl alcohol and deionized water: These two solvents can effectively dissolve the above three organosilicon compounds and make them evenly distributed in the solution. In addition, they can also adjust the viscosity and evaporation rate of the solution to meet different coating process requirements. In summary, the various components in the superhydrophobic liquid work together to achieve superhydrophobic treatment of the stainless steel filter of the vacuum cleaner. This treatment method can not only improve the filtering effect of the filter, reduce the adhesion of dust and oil, but also reduce the resistance of the filter and improve the penetration and silkiness of hair.

[0019] In a second aspect, the present application provides a vacuum cleaner stainless steel filter, which adopts the following technical solution: 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.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. High-precision etching: By precisely controlling the surface flatness of the stainless steel substrate to ≤20 microns and using high-pressure spray chemical etching liquid to perforate and etch the stainless steel substrate, high-precision mesh distribution is achieved. The average error of the etching aperture is ≤0.01mm, and the average error of the side etching is ≤0.01mm, which significantly improves the filtering effect of the filter.

[0021] 2. Super hydrophobic performance: By coating the super hydrophobic film, the stainless steel filter of the vacuum cleaner has super hydrophobic performance, and its contact angle is greater than 150°. This super hydrophobic performance can effectively reduce the adhesion of dust, oil and other substances, thereby reducing the resistance of the filter and improving the working efficiency of the vacuum cleaner.

[0022] 3. Reduce tension and improve silky performance: The tension is reduced by etching the round hole process and half etching the edge, avoiding deformation or damage of the filter caused by excessive tension. At the same time, the burrs on the edge of the etched hole are removed by plasma, which improves the penetration and silky performance of the hair and further enhances the user experience of the vacuum cleaner.

[0023] 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, which helps to reduce production costs and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to 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

[0025] The embodiments of the present application will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate 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, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0026] Example 1 A method for etching a stainless steel filter screen of a vacuum cleaner comprises the following steps: S1. Leveling a stainless steel substrate with a thickness of 0.2 mm, wherein the surface flatness of the stainless steel substrate after leveling is ≤ 20 μm; S2, degreasing, cleaning and activation: The leveled stainless steel substrate is degreasing and cleaned by high-pressure sputtering spraying degreasing cleaning solution at a cleaning speed of 6.5 m / s, and then high-pressure sputtering spraying deionized water is used for cleaning, and high-pressure sputtering spraying activation solution is used again to remove the oxide scale, and finally high-pressure sputtering spraying deionized water is used for cleaning to obtain a clean stainless steel substrate; the degreasing cleaning solution is 65 g / L sodium hydroxide, and the temperature is 90°C; the activation solution is 10 g / L ferric chloride and 10 g / L hydrochloric acid with a mass concentration of 37%, and the temperature is 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 ultraviolet heat energy 878Jr / s for the first photolysis exposure, and then use 9000W ultraviolet heat energy 2113Jr / s for the second 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 means of a chemical etching liquid with a high-pressure spraying temperature of 44° C. After etching, the surface is cleaned with deionized water and dried to obtain the etched stainless steel substrate; the chemical etching liquid comprises the following components: 720 g / L ferric chloride, 180 g / L accelerator, 80 g / L inorganic acid, 15 g / L chelating agent, and 6 g / L 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%.

[0027] S5, deburring: using plasma to remove burrs on the edges of the etched holes of 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 treatment 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 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.

[0028] 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 is composed of evenly distributed round holes and adjacent semicircular holes, and the density of the round 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] Example 2 A method for etching a stainless steel filter screen of a vacuum cleaner comprises the following steps: S1. Leveling a 0.2 mm stainless steel substrate, wherein the surface flatness of the leveled stainless steel substrate is ≤ 20 μm; S2, degreasing, cleaning and activation: The leveled stainless steel substrate is degreasing and cleaned by high-pressure sputtering at a cleaning speed of 6.5 m / s, and then deionized water is sprayed by high-pressure sputtering for cleaning, and activation liquid is sprayed by high-pressure sputtering again to remove the oxide scale, and finally deionized water is sprayed by high-pressure sputtering to obtain a clean stainless steel substrate; the degreasing cleaning liquid is 70 g / L sodium hydroxide, and the temperature is 70°C; the activation liquid is 15 g / L ferric chloride and 12 g / L hydrochloric acid with a mass concentration of 37%, and the temperature is 35°C; the spraying pressure of the high-pressure sputtering 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 ultraviolet heat energy 878Jr / s for the first photolysis exposure, and then use 9000W ultraviolet heat energy 2113Jr / s for the second photolysis curing after development; the photosensitive ink is the photosensitive ink of Guangdong Sanqiu Photocuring Materials Co., Ltd.; S4, spray etching: use 4kg / cm2 The stainless steel substrate treated in step S3 is subjected to perforation etching by using a chemical etching liquid with a high-pressure spray temperature of 46° C. After etching, the surface is cleaned with deionized water and dried to obtain the etched stainless steel substrate; the chemical etching liquid comprises the following components: 750 g / L ferric chloride, 200 g / L accelerator, 90 g / L inorganic acid, 18 g / L chelating agent, and 8 g / L 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%.

[0030] S5, deburring: using plasma to remove burrs on the edges of the etched holes of 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 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.

[0031] Example 3 A method for etching a stainless steel filter screen of a vacuum cleaner comprises the following steps: S1. The 0.2 mm stainless steel substrate is leveled, and the surface flatness of the leveled stainless steel substrate is ≤ 20 μm; S2, degreasing, cleaning and activation: The leveled stainless steel substrate is degreasing and cleaned by high-pressure sputtering spraying degreasing cleaning solution at a cleaning speed of 6.5 m / s, and then high-pressure sputtering spraying deionized water is used for cleaning, and high-pressure sputtering spraying activation solution is used again to remove the oxide scale, and finally high-pressure sputtering spraying deionized water is used for cleaning to obtain a clean stainless steel substrate; the degreasing cleaning solution is 68 g / L sodium hydroxide, and the temperature is 80°C; the activation solution is 13 g / L ferric chloride and 11 g / L hydrochloric acid with a mass concentration of 37%, and the temperature is 37°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 ultraviolet heat energy 878Jr / s for the first photolysis exposure, and then use 9000W ultraviolet heat energy 2113Jr / s for the second 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 means of a chemical etching liquid with a high-pressure spraying temperature of 45° C. After etching, the surface is cleaned with deionized water and dried to obtain the etched stainless steel substrate; the chemical etching liquid comprises the following components: 730 g / L ferric chloride, 190 g / L accelerator, 85 g / L inorganic acid, 17 g / L chelating agent, and 7 g / L 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%.

[0032] S5, deburring: using plasma to remove burrs on the edges of the etched holes of 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 treatment for 5.5 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 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.

[0033] Comparative Example 1 The same as Example 3, except that: in step S4, the inorganic acid is hydrochloric acid with a mass concentration of 37%.

[0034] Comparative Example 2 The same as Example 3, except that: in step S4, the inorganic acid is nitric acid with a mass concentration of 75%.

[0035] Comparative Example 3 The same as Example 3, except that: in step S4, the accelerator is thiourea peroxide.

[0036] Comparative Example 4 The same as Example 3, except that: in step S4, the accelerator is sodium persulfate.

[0037] Comparative Example 5 The same as Example 3, except that: in step S4, the chelating agent is diethylenetriaminepentaacetic acid.

[0038] Comparative Example 6 The same as Example 3, except that: in step S4, the chelating agent is potassium sodium tartrate.

[0039] Comparative Example 7 The same as Example 3, except that: in step S4, the chelating agent is trisodium methylamino acid diacetate.

[0040] Comparative Example 8 The same as Example 3, except that step S7 is not implemented.

[0041] Detection test 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 hole side etching size at 10 of the sample were randomly tested using a QV imager of Japan's Mitutoyo model QV-X302P12-C, and 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.

[0042] Contact angle: The contact angle meter SDC-100 was used for testing. The test results are shown in Table 1.

[0043] 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 locations of the sample are randomly tested and the tensile force displayed is within 0.02N for the sample to pass.

[0044] Table 1 Test results Analyzing the data in Table 1, we can see that: 1) The vacuum cleaner stainless steel filter provided in Examples 1 to 3 has 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; 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 the circular hole process and etching the edge half-engraved; the burrs on the edge of the etched hole are removed by plasma, and the penetration and silkiness of the hair are improved. The etching method of the present application improves the stability and reliability of the production process and is suitable for large-scale production.

[0045] 2) The comparative analysis of the etching accuracy of the vacuum cleaner stainless steel filter obtained in combination with Example 3 and Comparative Examples 1-2 shows that 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 synergistic effect between them can not only ensure sufficient etching ability, but also avoid the reduction in accuracy caused by excessive etching rate. They not only promote the etching of stainless steel, but also improve the etching efficiency and accuracy through synergy, and help maintain the stability of the etching solution.

[0046] 3) The comparative analysis of the etching accuracy of the vacuum cleaner stainless steel filter prepared in Example 3 and Comparative Examples 3-4 shows that the promoter is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:2. The synergistic effect between them can accelerate the etching speed of the chemical etching solution on the stainless steel substrate. Since thiourea peroxide and sodium persulfate have efficient etching ability and good selectivity, they are very useful for accurately controlling the average error of the etching aperture and side etching.

[0047] 4) The 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 jointly improves the stability and etching efficiency of the etching solution. Different chelating agents have different affinities for different metal ions. The 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 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.

[0048] The above embodiments are only used to explain the technical solutions of the present application rather than to limit them. Although the above embodiments provide a specific description of the present application, relevant technical personnel should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents, and any modifications and equivalent replacements that do not depart from the spirit and scope of the present application should be included in the protection scope 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 cleaned by high-pressure sputtering spraying degreasing cleaning solution at a cleaning speed of 6.5 m / s, then high-pressure sputtering spraying deionized water for cleaning, high-pressure sputtering spraying activation liquid again to remove oxide scale, and finally high-pressure sputtering spraying deionized water for cleaning to obtain a clean stainless steel substrate; 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 the first photolysis exposure, and then use 9000W ultraviolet light heat energy 2113Jr / s for secondary photolysis curing after development; 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 an etched stainless steel substrate; S5, deburring: using plasma to remove burrs on the edges of the etched holes of the etched stainless steel substrate; S6, except photosensitive ink: The stainless steel substrate treated in step S5 is immersed in a 5% sodium hydroxide solution at a temperature of 80 ℃ to remove the surface photosensitive ink, and then washed with deionized water and dried 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 0.5 h to obtain a vacuum cleaner stainless steel filter.

2. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 1, characterized in that: In step S2, the degreasing cleaning solution is 65-70g / L sodium hydroxide, and the temperature is 70-90°C; the activation solution is 10-15g / L ferric chloride, 10-12g / L hydrochloric acid with a mass concentration of 37%, and the temperature is 35-40°C; the spraying pressure of the high-pressure sputtering spray is 2.5kg / cm².

3. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 1, characterized in that: In step S4, the chemical etching solution includes 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.

4. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 3, characterized in that: 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.

5. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 3, characterized in that: The accelerator is composed of thiourea peroxide and sodium persulfate in a mass ratio of 3:

2.

6. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 3, characterized in that: The chelating agent is composed of diethylenetriaminepentaacetic acid, potassium sodium tartrate and trisodium methylamino acid diacetate in a mass ratio of 3:3:

5.

7. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 3, characterized in that: The stabilizer is 1,1,3,3-tetramethyldisiloxane.

8. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 1, characterized in that: In step S4, the pressure of the high-pressure spraying is 4kg / cm², and the volume content of oxygen in the high-pressure gas used in the high-pressure spraying is 15-18%.

9. The etching method for a stainless steel filter screen for a vacuum cleaner according to claim 1, characterized in that: In step S7, the preparation method of the super hydrophobic liquid is as follows: 4.6 kg of hexadecyltriethoxysilane, 2.2 kg of heptadecafluorodecyltrimethoxysilane 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 super hydrophobic liquid.

10. A stainless steel filter for a vacuum cleaner, characterized in that: The stainless steel filter screen of a vacuum cleaner is made by the etching method of any one of claims 1 to 9, 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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