Post-treatment method of PVA sponge brush

Abstract

The invention belongs to the technical field of wafer manufacturing, and relates to a PVA (polyvinyl alcohol) sponge brush post-processing method which at least comprises the following steps: curing, peeling, cleaning, curing and storing a demolded PVA sponge brush in sequence; wherein a complexing agent is added into a cleaning solution adopted for cleaning; the curing comprises oxidation soaking and / or ozone treatment. According to the post-treatment method, all links are systematically optimized, the problems that in a traditional post-treatment process, the peeling amount is difficult to control, the cleaning cleanliness is low, the physical property and appearance of a product are poor, and the adaptability of a storage scheme is poor are effectively solved, and the comprehensive performance of the obtained product well meets the use requirements of the high-end precise cleaning field.

Description

Technical Field

[0001] This invention belongs to the field of wafer manufacturing technology and relates to a post-processing method for PVA sponge brushes. Background Technology

[0002] PVA (polyvinyl alcohol) sponge brushes are widely used in high-precision manufacturing fields such as semiconductor wafer cleaning and surface cleaning of precision electronic devices due to their excellent hydrophilicity, softness, and cleaning ability. These applications place stringent requirements on the cleanliness, physical properties, appearance, and process adaptability of PVA sponge brushes. Currently, the mainstream process for preparing PVA sponge brushes in the industry includes basic steps such as material preparation, mold foaming, and demolding. To achieve industrialized production, plastic wrap is used to wrap the molding sleeve during the foaming stage to prevent PVA slurry overflow. At the same time, pore-forming agents (such as corn starch) are added to help form the sponge's porous structure. Post-demolding processing generally includes basic steps such as peeling, cleaning, and storage.

[0003] In existing technologies, after PVA sponge is foamed, the surface forms a dense outer layer due to the adhesion of the plastic wrap, sealing the internal pores. Therefore, peeling becomes a necessary post-processing step. However, the soft nature of PVA sponge itself makes the peeling process difficult to implement. Conventional manual or simple mechanical sanding methods lack precise control over the amount of material removed, easily leading to incomplete removal of the outer layer, preventing the pores from opening, or excessive sanding, which damages the sponge's porosity and dimensional consistency.

[0004] In the cleaning process, existing processes mostly use pure water combined with ultrasonic vibration, which can only remove a small amount of impurities from the surface of the sponge. It is difficult to effectively remove impurities that remain in the internal pores after the foaming process. At the same time, pure water cleaning cannot remove metal ions from the sponge itself or the cleaning water, which is difficult to meet the requirements of wafer cleaning scenarios where the content of metal ions and impurities is extremely low.

[0005] Furthermore, current processes typically proceed directly to the storage stage after the PVA sponge brushes have undergone foaming and cleaning. However, the internal molecular chains haven't completed subsequent reactions, resulting in physical properties such as tensile strength and compressive strength remaining at a basic level. Additionally, cornstarch residue can easily cause yellowing of the brush surface, affecting its appearance. Simultaneously, in the storage stage, the industry generally uses ammonia water as the sole antibacterial preservative, considering only its antibacterial effect while neglecting the differences in downstream customers' cleaning processes. For example, if a customer uses an acidic cleaning solution, the alkaline ammonia water preservative will react with the cleaning solution, affecting the actual cleaning effect of the brushes.

[0006] It is evident that the existing post-processing technology for PVA sponge brushes lacks systematic optimization at every stage, resulting in problems such as difficulty in controlling the amount of peeling, low cleaning efficiency, poor product properties and appearance, and poor adaptability of storage solutions. Consequently, the overall performance of the product cannot meet the needs of high-end precision cleaning applications. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a post-processing method for PVA sponge brushes, which systematically optimizes each step and overcomes problems such as difficulty in controlling peeling volume, low cleaning cleanliness, poor product properties and appearance, and poor adaptability of storage solutions in traditional post-processing processes.

[0008] To achieve this objective, the present invention adopts the following technical solution: This invention provides a post-processing method for PVA sponge brushes, which includes at least curing, peeling, cleaning, aging, and storing the demolded PVA sponge brushes in sequence.

[0009] The cleaning solution used in the cleaning process contains a complexing agent; the aging process includes oxidative soaking and / or ozone treatment.

[0010] This invention involves curing the PVA sponge brush before peeling to alter its processing characteristics, preventing incomplete removal of the outer layer and the resulting inability to open pores during the peeling process. This allows for precise control of the amount of outer layer removed from the sponge brush. The complexing agent in the cleaning solution, through chemical complexation combined with the physical action of cleaning, not only desorbs organic impurities from the surface and interior of the sponge but also effectively removes metal ions, significantly improving cleaning cleanliness. Oxidative soaking and / or ozone treatment promote the maturation reaction of the PVA sponge molecular chains through oxidation, enhancing the product's physical properties. Simultaneously, it oxidizes and decomposes residual coloring impurities within the sponge, resolving the yellowing problem. This improves the overall quality of the product in terms of both physical properties and appearance, perfectly matching the usage requirements of high-end precision cleaning applications.

[0011] Preferably, the curing includes: drying and / or freezing the demolded PVA sponge brush.

[0012] Preferably, the drying and curing temperature is ≤50℃.

[0013] Preferably, the freeze-curing temperature is ≤-12℃.

[0014] Preferably, the peeling process includes: using a diamond grinding wheel to rotary polish the surface of the cured PVA sponge brush, controlling the amount of skin removal through a positioning sensor, removing the dense skin from the surface of the PVA sponge brush, and exposing the pores inside the sponge.

[0015] Preferably, the thickness of the PVA sponge brush after skin removal is 50~100µm.

[0016] Preferably, the cleaning process includes immersing the peeled PVA sponge brush in a cleaning solution and then subjecting it to ultrasonic vibration.

[0017] Preferably, the cleaning process includes spraying the peeled PVA sponge brush with a cleaning solution.

[0018] Preferably, the ultrasonic oscillation is a low-frequency ultrasonic oscillation, and the ultrasonic frequency is 40~80Hz.

[0019] Preferably, the spray flow rate of the spray treatment is 1000~1500mL / min.

[0020] Preferably, the complexing agent in the cleaning solution includes oxalic acid and / or citric acid.

[0021] Preferably, the concentration of the complexing agent in the cleaning solution is ≤0.1wt%.

[0022] Preferably, the oxidation soaking includes: immersing the cleaned PVA sponge brush in an oxidation solution for aging treatment.

[0023] Preferably, the oxidizing solution comprises a hydrogen peroxide solution with a concentration of 0.01 wt% to 1 wt%.

[0024] Preferably, the preservation includes: selecting a corresponding antibacterial preservation solution to preserve the aged PVA sponge brush according to the acidity or alkalinity of the cleaning solution used by the customer.

[0025] If the customer uses an acidic cleaning solution, hydrogen peroxide solution is selected as the antibacterial preservative solution; if the customer uses an alkaline cleaning solution, ammonia solution is selected as the antibacterial preservative solution.

[0026] Compared with the prior art, the present invention has the following beneficial effects: This invention involves curing the PVA sponge brush before peeling to alter its processing characteristics, preventing incomplete removal of the outer layer and the resulting inability to open pores during the peeling process. This allows for precise control of the amount of outer layer removed from the sponge brush. The complexing agent in the cleaning solution, through chemical complexation combined with the physical action of cleaning, not only desorbs organic impurities from the surface and interior of the sponge but also effectively removes metal ions, significantly improving cleaning cleanliness. Oxidative soaking and / or ozone treatment promote the maturation reaction of the PVA sponge molecular chains through oxidation, enhancing the product's physical properties. Simultaneously, it oxidizes and decomposes residual coloring impurities within the sponge, resolving the yellowing problem. This improves the overall quality of the product in terms of both physical properties and appearance, perfectly matching the usage requirements of high-end precision cleaning applications. Attached Figure Description

[0027] Figure 1 This is a microscopic comparison of the surface of the PVA sponge brush before and after peeling using the post-processing method provided in Example 1. Detailed Implementation

[0028] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0029] One embodiment of the present invention provides a post-processing method for PVA sponge brushes, which includes at least curing, peeling, cleaning, aging and storing the demolded PVA sponge brushes in sequence.

[0030] The cleaning solution used in the cleaning process contains a complexing agent; the aging process includes oxidative soaking and / or ozone treatment.

[0031] This invention involves curing the PVA sponge brush before peeling to alter its processing characteristics, preventing incomplete removal of the outer layer and the resulting inability to open pores during the peeling process. This allows for precise control of the amount of outer layer removed from the sponge brush. The complexing agent in the cleaning solution, through chemical complexation combined with the physical action of cleaning, not only desorbs organic impurities from the surface and interior of the sponge but also effectively removes metal ions, significantly improving cleaning cleanliness. Oxidative soaking and / or ozone treatment promote the maturation reaction of the PVA sponge molecular chains through oxidation, enhancing the product's physical properties. Simultaneously, it oxidizes and decomposes residual coloring impurities within the sponge, resolving the yellowing problem. This improves the overall quality of the product in terms of both physical properties and appearance, perfectly matching the usage requirements of high-end precision cleaning applications.

[0032] In some embodiments, the curing includes: drying and / or freezing the demolded PVA sponge brush.

[0033] In some embodiments, the drying and curing temperature is ≤50°C, for example, it may be 30°C, 32°C, 34°C, 36°C, 38°C, 40°C, 42°C, 44°C, 46°C, 48°C or 50°C, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0034] In some embodiments, the freeze-curing temperature is ≤-12°C, for example, it may be -25°C, -24°C, -23°C, -22°C, -20°C, -19°C, -18°C, -17°C, -16°C, -15°C, -14°C, -13°C or -12°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0035] In some embodiments, the peeling process includes: using a diamond grinding wheel to rotary polish the surface of the cured PVA sponge brush, controlling the amount of skin removal through a positioning sensor, removing the dense skin from the surface of the PVA sponge brush, and exposing the pores inside the sponge.

[0036] Compared to traditional manual / simple mechanical grinding, the diamond wheel rotary grinding method used in this invention can efficiently remove the dense epidermis from the surface of the sponge brush, making it suitable for industrial mass production. At the same time, the amount of epidermis removed is controlled by a positioning sensor, which can accurately remove the epidermis and avoid over-grinding. This ensures that the pores inside the sponge are fully exposed, while maintaining the porosity and dimensional consistency of the sponge brush, thus ensuring stable product performance.

[0037] In some embodiments, the epidermal removal thickness of the PVA sponge brush is 50~100µm, for example, it can be 50µm, 55µm, 60µm, 65µm, 70µm, 75µm, 80µm, 85µm, 90µm, 95µm or 100µm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0038] In some embodiments, the cleaning includes immersing the peeled PVA sponge brush in a cleaning solution and subjecting it to ultrasonic vibration.

[0039] The physical force generated by the ultrasonic vibration can efficiently remove impurities such as starch residue and grinding debris adsorbed on the surface and pores of the sponge brush. The cleaning effect is far superior to simple soaking or washing, which can effectively improve the cleanliness of the sponge brush and meet the impurity removal requirements of high-end scenarios such as wafer cleaning.

[0040] In some embodiments, the cleaning includes spraying the peeled PVA sponge brush with a cleaning solution.

[0041] The above-mentioned spraying treatment can precisely rinse the surface of the sponge brush and the exposed pores after peeling, quickly removing the surface debris and surface impurities generated during polishing, and specifically cleaning the immediate impurities generated after peeling. Moreover, the spraying treatment is a non-immersion operation, which does not require a large amount of cleaning fluid, saving consumables. It also makes the subsequent draining and drying steps more convenient, improving the overall process efficiency of post-processing and adapting to the needs of continuous industrial production.

[0042] In addition, spraying can be combined with cleaning methods such as ultrasonic vibration, and the spray flow rate and angle can be flexibly adjusted according to the actual impurities on the sponge brush, making the process highly flexible and adaptable.

[0043] In some embodiments, the ultrasonic oscillation is low-frequency ultrasonic oscillation, and the ultrasonic frequency is 40~80Hz, for example, it can be 40Hz, 45Hz, 50Hz, 55Hz, 60Hz, 65Hz, 70Hz, 75Hz or 80Hz, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0044] In some embodiments, the spray flow rate of the spray treatment is 1000~1500 mL / min, for example, it can be 1000 mL / min, 1050 mL / min, 1100 mL / min, 1150 mL / min, 1200 mL / min, 1250 mL / min, 1300 mL / min, 1350 mL / min, 1400 mL / min, 1450 mL / min or 1500 mL / min, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0045] In some embodiments, the complexing agent in the cleaning solution includes oxalic acid and / or citric acid.

[0046] Oxalic acid exhibits excellent chelating properties for metal ions, while citric acid, while possessing good chelating ability, has shorter molecular chains that are easier to clean and leave no residue. Both can be used alone or in combination, allowing technicians to flexibly choose the appropriate method based on actual production impurity removal needs. This efficient chelating and removal of metal ions from the sponge brush body and cleaning solution enhances cleanliness. Furthermore, both are mild chelating agents, producing no harmful byproducts after the chelating reaction. They do not damage the material structure of the PVA sponge brush or introduce new contaminants, meeting the stringent requirements of precision cleaning scenarios such as wafer cleaning for zero secondary contamination.

[0047] In addition, both oxalic acid and citric acid are readily soluble in water and can be directly added to aqueous cleaning solutions without the need for additional solvent preparation. They are highly compatible with cleaning methods such as ultrasonic vibration and spraying, and do not require changes to existing cleaning processes, demonstrating strong adaptability.

[0048] In some embodiments, the concentration of the complexing agent in the cleaning solution is ≤0.1wt%, for example, it may be 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, or 0.1wt%, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0049] In some embodiments, the oxidation soaking includes immersing the cleaned PVA sponge brush in an oxidation solution for aging treatment.

[0050] In some embodiments, the oxidizing solution comprises a hydrogen peroxide solution with a concentration of 0.01wt% to 1wt%, for example, it may be 0.01wt%, 0.05wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, or 1wt%, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0051] The concentration range of the above-mentioned hydrogen peroxide solution can be flexibly adjusted according to the specifications, batches and curing requirements of the PVA sponge brush. It can not only meet the basic curing requirements, but also achieve different goals such as improving physical properties and whitening appearance through precise control of concentration, making it suitable for industrial mass production.

[0052] In addition, hydrogen peroxide decomposes into water and oxygen after oxidation, leaving no harmful residues on the sponge brush and introducing no new pollutants, thus meeting the cleanliness requirements of high-end precision scenarios such as wafer cleaning.

[0053] In some embodiments, the preservation includes: selecting a corresponding antibacterial preservation solution to preserve the aged PVA sponge brush according to the acidity or alkalinity of the cleaning solution used by the customer.

[0054] If the customer uses an acidic cleaning solution, hydrogen peroxide solution is selected as the antibacterial preservative solution; if the customer uses an alkaline cleaning solution, ammonia solution is selected as the antibacterial preservative solution.

[0055] This invention selects antibacterial preservation solutions according to the acidity or alkalinity of the customer's cleaning solution. Acidic cleaning solutions are mixed with hydrogen peroxide solution, and alkaline cleaning solutions are mixed with ammonia solution. This fundamentally avoids acid-base reactions between the antibacterial preservation solution and the customer's cleaning solution, ensuring the effectiveness of the PVA sponge brush in actual cleaning scenarios and effectively solving the problem of poor compatibility of traditional single ammonia preservation solutions.

[0056] In addition, both hydrogen peroxide and ammonia have excellent antibacterial effects, which can effectively inhibit the growth of bacteria and mold during the storage of sponge brushes, prevent product deterioration, and both are easy to volatilize and easy to clean. Customers do not need to perform any additional complicated treatments before use, and there will be no antibacterial ingredients left on the sponge brushes, avoiding the introduction of new contaminants, which meets the cleanliness requirements of precision cleaning scenarios such as wafer cleaning.

[0057] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0058] Example 1 This embodiment provides a post-processing method for PVA sponge brushes, specifically including the following steps: (1) Curing: The demolded PVA sponge brush is dried and cured at 45°C for 4 hours.

[0059] (2) Peeling: The surface of the cured PVA sponge brush is polished with a diamond grinding wheel. The thickness of the peeling is 80μm, controlled by a positioning sensor. The dense epidermis of the PVA sponge brush surface is removed to expose the pores inside the sponge (see the microscopic comparison of the PVA sponge brush surface before and after peeling). Figure 1 ).

[0060] (3) Cleaning: Immerse the peeled PVA sponge brush in the cleaning solution (0.02wt% oxalic acid) and ultrasonically vibrate at 60Hz for 45min.

[0061] (4) Curing: Immerse the cleaned PVA sponge brush in 0.1wt% hydrogen peroxide solution for 5 days for curing treatment.

[0062] (5) Preservation: Since the cleaning solution used by the customer is acidic, hydrogen peroxide solution is selected as the antibacterial preservation solution to preserve the matured PVA sponge brush.

[0063] Upon inspection, the PVA sponge brush obtained in this embodiment showed no visible impurities after cleaning, and its pores were intact, its surface was smooth, and its size was uniform, meeting the usage requirements of high-end precision cleaning fields.

[0064] Example 2 This embodiment provides a post-processing method for PVA sponge brushes, specifically including the following steps: (1) Curing: The demolded PVA sponge brush was frozen and cured at -15℃ for 1.5h.

[0065] (2) Peeling: The surface of the cured PVA sponge brush is polished by rotating a diamond grinding wheel. The thickness of the peel is 50μm, controlled by a positioning sensor, to remove the dense peel of the PVA sponge brush and expose the pores inside the sponge.

[0066] (3) Cleaning: Immerse the peeled PVA sponge brush in the cleaning solution (0.05wt% citric acid) and ultrasonically vibrate at 40Hz for 60min.

[0067] (4) Curing: Immerse the cleaned PVA sponge brush in 0.01wt% hydrogen peroxide solution for curing for 10 days.

[0068] (5) Preservation: Since the cleaning solution used by the customer is alkaline, ammonia solution is selected as the antibacterial preservation solution to preserve the matured PVA sponge brush.

[0069] Upon inspection, the PVA sponge brush obtained in this embodiment showed no visible impurities after cleaning, and its pores were intact, its surface was smooth, and its size was uniform, meeting the usage requirements of high-end precision cleaning fields.

[0070] Example 3 This embodiment provides a post-processing method for PVA sponge brushes, specifically including the following steps: (1) Curing: The demolded PVA sponge brush is dried and cured at 50°C for 4 hours.

[0071] (2) Peeling: The surface of the cured PVA sponge brush is polished by rotating a diamond grinding wheel. The thickness of the peel is 100μm, controlled by a positioning sensor, to remove the dense peel of the PVA sponge brush and expose the pores inside the sponge.

[0072] (3) Cleaning: Immerse the peeled PVA sponge brush in the cleaning solution (0.05wt% oxalic acid) and ultrasonically vibrate at 40Hz for 30min.

[0073] (4) Curing: The cleaned PVA sponge brush is treated with ozone, with the ozone concentration controlled at 2ppm and the treatment time at 10min.

[0074] (5) Preservation: Since the cleaning solution used by the customer is acidic, hydrogen peroxide solution is selected as the antibacterial preservation solution to preserve the matured PVA sponge brush.

[0075] Upon inspection, the PVA sponge brush obtained in this embodiment showed no visible impurities after cleaning, and its pores were intact, its surface was smooth, and its size was uniform, meeting the usage requirements of high-end precision cleaning fields.

[0076] Comparative Example 1 This comparative example provides a post-processing method for a PVA sponge brush. Except for the fact that curing is not performed before peeling, the other steps and conditions are the same as in Example 1, so they will not be described again here.

[0077] Compared to Example 1, since this comparative example was not cured before peeling, the soft sponge experienced incomplete removal of the outer skin during the peeling process, resulting in the inability to open the pores. Furthermore, the amount of outer skin removed by the sponge brush was difficult to control precisely, and the porosity and dimensional consistency of the sponge brush were significantly reduced.

[0078] Comparative Example 2 This comparative example provides a post-treatment method for a PVA sponge brush. Except for replacing the cleaning solution with deionized water, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0079] Compared to Example 1, since the cleaning solution in this comparative example is replaced with deionized water, it can only desorb a small amount of impurities on the surface of the sponge. It is difficult to effectively remove impurities remaining in the internal pores during the foaming process, and it cannot remove metal ions from the sponge body and the cleaning water. Therefore, it is difficult to meet the requirements of wafer cleaning scenarios where the content of metal ions and impurities is extremely low.

[0080] Comparative Example 3 This comparative example provides a post-processing method for a PVA sponge brush. Except that it is not cured after cleaning but is directly stored, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0081] Compared to Example 1, this comparative example did not cure the cleaned PVA sponge brush, resulting in a yellowing of the sponge brush surface, affecting its appearance quality. Furthermore, the PVA sponge molecular chains did not complete the curing reaction, leading to a significant reduction in both tensile and compressive strength.

[0082] Therefore, this invention cures the PVA sponge brush before peeling to change its processing characteristics, avoiding the phenomenon of incomplete peeling of soft sponges that prevents pores from opening, thus achieving precise control of the amount of sponge brush peel removed. The complexing agent in the cleaning solution, through chemical complexation and combined with the physical action of cleaning, can not only desorb organic impurities on the surface and inside of the sponge, but also effectively remove metal ions, significantly improving cleaning cleanliness. Oxidation soaking and / or ozone treatment promote the maturation reaction of PVA sponge molecular chains through oxidation, improving the physical properties of the product. At the same time, it oxidizes and decomposes the color-causing residual impurities in the sponge, solving the problem of product yellowing. It improves the overall quality of the product from both physical and appearance aspects, perfectly matching the usage needs of high-end precision cleaning fields.

[0083] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A post-processing method for PVA sponge brushes, characterized in that, The post-processing method includes at least curing, peeling, cleaning, aging and storing the demolded PVA sponge brush in sequence. The cleaning solution used in the cleaning process contains a complexing agent; the aging process includes oxidative soaking and / or ozone treatment.

2. The post-processing method for the PVA sponge brush according to claim 1, characterized in that, The curing process includes: drying and curing the demolded PVA sponge brush and / or freeze curing.

3. The post-processing method for the PVA sponge brush according to claim 2, characterized in that, The drying and curing temperature is ≤50℃; And / or, the freeze-curing temperature is ≤-12℃.

4. The post-processing method for the PVA sponge brush according to claim 1 or 2, characterized in that, The peeling process includes: using a diamond grinding wheel to rotary polish the surface of the cured PVA sponge brush, controlling the amount of epidermis removal through a positioning sensor, removing the dense epidermis from the surface of the PVA sponge brush, and exposing the pores inside the sponge.

5. The post-processing method for the PVA sponge brush according to claim 4, characterized in that, The PVA sponge brush has a skin removal thickness of 50~100µm.

6. The post-processing method for the PVA sponge brush according to claim 1 or 2, characterized in that, The cleaning process includes: immersing the peeled PVA sponge brush in a cleaning solution and then subjecting it to ultrasonic vibration. And / or, spray the peeled PVA sponge brush with a cleaning solution.

7. The post-processing method for the PVA sponge brush according to claim 6, characterized in that, The ultrasonic oscillation is a low-frequency ultrasonic oscillation, and the ultrasonic frequency is 40~80Hz. And / or, the spray flow rate of the spray treatment is 1000~1500mL / min.

8. The post-processing method for the PVA sponge brush according to claim 1 or 2, characterized in that, The complexing agent in the cleaning solution includes oxalic acid and / or citric acid; And / or, the concentration of the complexing agent in the cleaning solution is ≤0.1wt%.

9. The post-processing method for the PVA sponge brush according to claim 1 or 2, characterized in that, The oxidation soaking includes: immersing the cleaned PVA sponge brush in an oxidation solution for aging treatment; The oxidizing solution includes a hydrogen peroxide solution with a concentration of 0.01 wt% to 1 wt%.

10. The post-processing method for the PVA sponge brush according to claim 1 or 2, characterized in that, The preservation includes: selecting the appropriate antibacterial preservation solution to preserve the matured PVA sponge brush according to the acidity or alkalinity of the cleaning solution used by the customer; If the customer uses an acidic cleaning solution, hydrogen peroxide solution is selected as the antibacterial preservative solution; if the customer uses an alkaline cleaning solution, ammonia solution is selected as the antibacterial preservative solution.

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