A method for modifying superhydrophilic stainless steel fillers

Abstract

The application discloses a kind of super hydrophilic stainless steel packing modification method, belong to stainless steel packing technical field.The application utilizes sodium hydroxide and the saponification of functional group contained in surfactant, emulsification and chelation of sodium sulfonate, castor oil ester, boron anhydride pyridine complex etc., by wetting, penetration, dispersion etc., grease on the surface of stainless steel packing is dissolved, to remove;Sodium sulfonate is combined with calcium and magnesium ions in water to form water-soluble sulfonate, reduces the surface tension of water, so that grease is more easily removed from the surface of workpiece;During cleaning process, castor oil ester can quickly penetrate into the interior of grease, so that grease becomes loose, easy to remove;In addition, castor oil ester can also form a protective film on the metal surface, prevent metal oxidation and corrosion, boron anhydride pyridine complex: they can react with organic matter in grease, so that grease is decomposed into small molecules, so it is easier to be cleaned.

Description

Technical Field

[0001] This invention relates to the field of stainless steel packing technology, and in particular to a method for modifying superhydrophilic stainless steel packing. Background Technology

[0002] The contaminants adhering to the surface of stainless steel packing mainly consist of three parts: an oil film layer tightly adhering to the surface, a small amount of iron filings and other impurities, and a very small amount of iron oxide film. Stainless steel packing has a relatively high grease content during the production process, and there are many effective methods for removing grease from metal surfaces. Increasing the temperature can soften the grease on the packing surface and increase its fluidity; this process is simple and low-cost, but degreasing is incomplete. Traditional degreasing using single organic solvents such as acetone and ethers is fast, but its effectiveness is not ideal for packings with large surface areas. Organic solvents are usually flammable, explosive, and dangerous, posing a risk to operators and the environment. Chemical degreasing, which involves a saponification reaction between alkali and grease to produce soap and salt, softens organic contaminants, and dissolves them in the solution, is particularly suitable for degreasing.

[0003] Chinese Patent CN1166813C discloses a chemical treatment method for stainless steel packing used in separation towers. The method involves immersing the stainless steel packing in a chemical coating working solution at 20–100°C for 1–5 hours, then rinsing it with water until neutral, and finally air-drying it. The chemical coating working solution consists of inorganic acid A, inorganic salt B, and additive C. Treatment using this method increases the packing's wettability to aqueous solutions and generates a fine oxide film, thus significantly improving the packing's surface wettability to aqueous solutions, increasing the separation efficiency of substances in the aqueous solution, and also greatly enhancing the packing's corrosion resistance.

[0004] Chinese Patent CN1175123C relates to a stainless steel packing material for tower equipment. The chemical composition (wt%) is: C≤0.10, Cr15~20, Ni10~15, Mo4~8, N≤0.30, S≤0.03, P≤0.03, Mn≤2.0, Si≤1.00, with the remainder being Fe. Electrochemical testing shows that the material exhibits higher corrosion resistance in chloride media than ordinary stainless steel, reaching the level of high-grade stainless steel. This invention possesses excellent mechanical properties and machinability, and can be processed into bars, tubes, plates, wires, strips, and various forms of castings.

[0005] Chinese Patent CN112934162A: Belonging to the field of chemical machinery technology, this patent relates to a stainless steel packing material for high-purity reagent purification and separation. The packing body includes several alternating folded protrusions and several folded recesses forming a ring. The ends of the folded protrusions have a first hollow portion connecting the outer and inner sides of the ring, and a first oblique guide is provided on this first hollow portion. The sides of the folded protrusions have a second hollow portion connecting the outer and inner sides of the ring, and a second oblique guide is provided on this second hollow portion. The folded recesses have inner and outer convex ribs arranged alternately along the axial direction. The packing body, with its alternating arrangement of folded protrusions and recesses forming a multi-folded ring, possesses flat, saddle, and ring characteristics. Combined with the hollow and oblique guide structures, this gives the packing material a high throughput and excellent self-distribution performance, improving purification and separation efficiency and achieving a separation purity of 99.9 wt%.

[0006] Currently, the main methods for treating the surface of stainless steel fillers include electrochemical methods, anodizing methods, sol-gel methods, and controlled oxidation methods. However, most of these methods have drawbacks such as high cost, difficulty in control, and complex processes. They also have disadvantages such as poor grease cleaning effect and unsatisfactory hydrophilicity. Summary of the Invention

[0007] The purpose of this invention is to solve the aforementioned technical problems existing in the prior art and to provide a method for modifying superhydrophilic stainless steel fillers. This method utilizes the saponification, emulsification, and chelation effects of functional groups such as sodium hydroxide and surfactants containing sodium sulfonate, castor oil ester, and boron anhydride pyridine complex to dissolve the grease on the surface of the stainless steel filler through wetting, penetration, and dispersion. Castor oil ester can also form a protective film on the metal surface to prevent metal oxidation and corrosion. The boron anhydride pyridine complex can react with organic matter in the grease, decomposing the grease into smaller molecules that are easier to remove.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0010] S1: Weigh 80-100 parts stainless steel filler, 100-150 parts deionized water, 5-10 parts sodium hydroxide solution with a mass concentration of 10-20%, and 1-3 parts surfactant by weight, stir and mix, heat to 40-60℃, soak, and sonicate for 20-40 minutes.

[0011] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0012] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0013] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0014] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0015] Furthermore, the stainless steel filler material is preferably AISI304 or AISI316.

[0016] Furthermore, the stainless steel packing is selected from bulk or structured packing. The bulk packing is at least one of the following: Sital rings, Raschig rings, rectangular saddle rings, stepped rings, and Pall rings. The structured packing is at least one of the following: wire mesh corrugated packing, perforated plate corrugated packing, perforated plate corrugated packing, and plate mesh corrugated packing.

[0017] Furthermore, the molar ratio of the added strong acid solution to the permanganate solution is 0.5-5:1.

[0018] Furthermore, the strong acid can be one or more of nitric acid and sulfuric acid, and the concentration of the strong acid is 3-15 mol·L⁻¹. -1 .

[0019] Furthermore, the permanganate may be one or more of potassium permanganate and sodium permanganate, and the permanganate concentration is 1-5 mol·L⁻¹. -1 .

[0020] Furthermore, the circulating reaction flow rate of the mixed solution within the reactor is 0.05-0.15 m / s. -1 The reaction cycle lasts for 8-12 hours.

[0021] Furthermore, the reaction temperature is 70-90℃.

[0022] Furthermore, the drying process involves a vacuum degree of 0.09-0.095 MPa, a temperature of 50-70°C, and a time of 5-8 hours.

[0023] Furthermore, the method for preparing the surfactant is as follows:

[0024] By weight, add 16-30 parts of sodium dimercaptopropanesulfonate, 40-80 parts of castor oil maleate, 0.05-0.2 parts of ethylene boric anhydride pyridine complex, 200-300 parts of toluene, and 2-5 parts of triethylamine to a reaction vessel, react at 70-80℃ for 1-3 hours, and remove toluene by distillation to obtain the surfactant.

[0025] The above surfactant preparation mechanism: one thiol group of sodium dimercaptopropanesulfonate undergoes an addition reaction with ricinole maleate, and the other thiol group undergoes an addition reaction with ethylene boric anhydride pyridine complex, resulting in a surfactant containing functional groups such as sodium sulfonate, ricinole maleate, and boric anhydride pyridine complex.

[0026] Technical effects:

[0027] The present invention provides a method for modifying superhydrophilic stainless steel fillers, which, compared with the prior art, has the following significant advantages:

[0028] 1. This invention utilizes the saponification, emulsification, and chelation effects of functional groups such as sodium hydroxide and surfactants containing sodium sulfonate, castor oil ester, and boric anhydride pyridine complex to dissolve and remove grease from the surface of stainless steel filler through wetting, penetration, and dispersion. Sodium sulfonate combines with calcium and magnesium ions in water to form water-soluble sulfonates, reducing the surface tension of water and making it easier to remove grease from the workpiece surface.

[0029] 2. In the cleaning process of this invention, castor oil ester can quickly penetrate into the interior of the grease, making the grease loose and easy to remove; in addition, castor oil ester can also form a protective film on the metal surface to prevent metal oxidation and corrosion. Boric anhydride pyridine complex: they can react with the organic matter in the grease, decomposing the grease into small molecules, thus making it easier to remove.

[0030] 3. This invention uses ultrasonic cleaning to remove grease from the surface of stainless steel packing. It utilizes ultrasonic oscillation to generate countless tiny bubbles, causing the dirt to burst and peel off. Furthermore, under the action of penetration, it intensifies the dissolution, dispersion, and emulsification, thereby thoroughly cleaning the surface of the stainless steel packing.

[0031] 4. The potassium permanganate solution under acidic conditions of the present invention performs surface corrosion on stainless steel, forming an oxide film on the stainless steel surface. As the temperature rises, hydrophilic oxidation occurs, further enhancing the radial corrosion resistance and increasing the surface roughness, thereby increasing its hydrophilicity. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] Figure 1 Modified stainless steel Westerner ring bulk packing;

[0034] Figure 2 Modified stainless steel Westerner ring bulk packing;

[0035] Figure 3 Modified stainless steel Westerner ring bulk packing;

[0036] Figure 4 Modified stainless steel Westerner ring bulk packing;

[0037] Figure 5 Contact angle test for modified stainless steel Sitta ring bulk packing;

[0038] Figure 6 Contact angle test of modified stainless steel Sitta ring bulk packing. Detailed Implementation

[0039] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0040] Example Test Standard Method:

[0041] 1. Hydrophilicity test: The hydrophilicity of the stainless steel filler before and after modification was tested using a water contact angle meter;

[0042] 2. Separation performance test: Heavy water separation test was conducted on the stainless steel West Tower Ring bulk packing before and after modification using a distillation column.

[0043] Example 1

[0044] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0045] S1: Weigh 80g of stainless steel filler, 100g of deionized water, 5g of 10% sodium hydroxide solution, and 1g of surfactant. Stir and mix, heat to 40℃, soak, and sonicate for 20min.

[0046] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0047] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0048] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0049] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0050] The stainless steel packing material is preferably AISI304.

[0051] The stainless steel packing material used is a Sitta ring.

[0052] The molar ratio of the strong acid solution to the permanganate solution is 0.5:1.

[0053] The strong acid mentioned is nitric acid with a concentration of 3 mol·L⁻¹. -1 .

[0054] The permanganate may be potassium permanganate with a concentration of 1 mol·L⁻¹. -1 .

[0055] The circulating flow rate of the mixed solution within the reactor is 0.05 m / s. -1 The reaction was repeated for 8 hours.

[0056] The reaction temperature is 70°C.

[0057] The drying process involves a vacuum of 0.09 MPa, a temperature of 50°C, and a drying time of 5 hours.

[0058] The method for preparing the surfactant is as follows:

[0059] 16g sodium dimercaptopropanesulfonate, 40g castor oil maleate, 0.05g ethylene boric anhydride pyridine complex, 200g toluene, and 2g triethylamine were added to a reaction vessel and reacted at 70℃ for 1h. Toluene was removed by distillation to obtain the surfactant.

[0060] Example 2

[0061] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0062] S1: Weigh 85g of stainless steel filler, 110g of deionized water, 6g of 15% sodium hydroxide solution, and 2g of surfactant. Stir and mix, heat to 45℃, soak, and sonicate for 25 minutes.

[0063] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0064] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0065] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0066] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0067] The stainless steel packing material is preferably AISI304.

[0068] The stainless steel packing material used is a Pall ring.

[0069] The molar ratio of the strong acid solution to the permanganate solution is 2:1.

[0070] The strong acid mentioned is nitric acid with a concentration of 8 mol·L⁻¹. -1 .

[0071] The permanganate mentioned is potassium permanganate with a concentration of 2 mol·L⁻¹. -1 .

[0072] The circulating reaction flow rate of the mixed solution in the reactor is 0.08 m·s. -1 The reaction cycled for 9 hours.

[0073] The reaction temperature is 75°C.

[0074] The drying process involves a vacuum of 0.09 MPa, a temperature of 55°C, and a drying time of 6 hours.

[0075] The method for preparing the surfactant is as follows:

[0076] 20g sodium dimercaptopropanesulfonate, 50g castor oil maleate, 0.1g ethylene boric anhydride pyridine complex, 240g toluene, and 3g triethylamine were added to a reaction vessel and reacted at 75°C for 2 hours. Toluene was removed by distillation to obtain the surfactant.

[0077] Example 3

[0078] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0079] S1: Weigh 95g of stainless steel filler, 140g of deionized water, 9g of 15% sodium hydroxide solution, and 2g of surfactant. Stir and mix, heat to 55℃, soak, and sonicate for 35 minutes.

[0080] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0081] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0082] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0083] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0084] The stainless steel packing material is preferably AISI316.

[0085] The stainless steel packing material is selected from wire mesh corrugated packing.

[0086] The molar ratio of the strong acid solution to the permanganate solution is 4:1.

[0087] The strong acid mentioned is sulfuric acid with a concentration of 12 mol·L⁻¹. -1 .

[0088] The permanganate mentioned is sodium permanganate with a concentration of 4 mol·L⁻¹. -1 .

[0089] The circulating reaction flow rate of the mixed solution in the reactor is 0.13 m·s. -1 The reaction was repeated for 11 hours.

[0090] The reaction temperature is 85°C.

[0091] The drying process involves a vacuum of 0.095 MPa, a temperature of 65°C, and a drying time of 7 hours.

[0092] The method for preparing the surfactant is as follows:

[0093] 27g sodium dimercaptopropanesulfonate, 70g castor oil maleate, 0.15g ethylene boric anhydride pyridine complex, 280g toluene, and 4g triethylamine were added to a reaction vessel and reacted at 75°C for 2 hours. Toluene was removed by distillation to obtain the surfactant.

[0094] Example 4

[0095] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0096] S1: Weigh 100g stainless steel filler, 150g deionized water, 10g sodium hydroxide solution with a mass concentration of 20% and 3g surfactant, stir and mix, heat to 60℃, soak, and sonicate for 40min.

[0097] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0098] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0099] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0100] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0101] The stainless steel packing material is preferably AISI316.

[0102] The stainless steel packing material is selected from corrugated mesh packing.

[0103] The molar ratio of the strong acid solution to the permanganate solution is 5:1.

[0104] The strong acid mentioned is sulfuric acid with a concentration of 15 mol·L⁻¹. -1 .

[0105] The permanganate is sodium permanganate, and the permanganate concentration is 5 mol·L⁻¹. -1 .

[0106] The circulating reaction flow rate of the mixed solution within the reactor is 0.15 m·s. -1 The reaction was repeated for 12 hours.

[0107] The reaction temperature is 90℃.

[0108] The drying process involves a vacuum of 0.095 MPa, a temperature of 70°C, and a drying time of 8 hours.

[0109] The method for preparing the surfactant is as follows:

[0110] 30g sodium dimercaptopropanesulfonate, 80g castor oil maleate, 0.2g ethylene boric anhydride pyridine complex, 300g toluene, and 5g triethylamine were added to a reaction vessel and reacted at 80℃ for 3h. Toluene was removed by distillation to obtain the surfactant.

[0111] Comparative Example 1

[0112] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0113] S1: Weigh 80g of stainless steel filler, 100g of deionized water, and 5g of 10% sodium hydroxide solution, stir and mix, heat to 40℃, soak, and sonicate for 20min.

[0114] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0115] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0116] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0117] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0118] The stainless steel packing material is preferably AISI304.

[0119] The stainless steel packing material used is a Sitta ring.

[0120] The molar ratio of the strong acid solution to the permanganate solution is 0.5:1.

[0121] The strong acid mentioned is nitric acid with a concentration of 3 mol·L⁻¹. -1 .

[0122] The permanganate may be potassium permanganate with a concentration of 1 mol·L⁻¹. -1 .

[0123] The circulating flow rate of the mixed solution within the reactor is 0.05 m / s. -1 The reaction was repeated for 8 hours.

[0124] The reaction temperature is 70°C.

[0125] The drying process involves a vacuum of 0.09 MPa, a temperature of 50°C, and a drying time of 5 hours.

[0126] Comparative Example 2

[0127] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0128] S1: Weigh 80g of stainless steel filler, 100g of deionized water, 5g of 10% sodium hydroxide solution, and 1g of surfactant. Stir and mix, heat to 40℃, soak, and sonicate for 20min.

[0129] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0130] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0131] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0132] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0133] The stainless steel packing material is preferably AISI304.

[0134] The stainless steel packing material used is a Sitta ring.

[0135] The molar ratio of the strong acid solution to the permanganate solution is 0.5:1.

[0136] The strong acid mentioned is nitric acid with a concentration of 3 mol·L⁻¹. -1 .

[0137] The permanganate may be potassium permanganate with a concentration of 1 mol·L⁻¹. -1 .

[0138] The circulating flow rate of the mixed solution within the reactor is 0.05 m / s. -1 The reaction was repeated for 8 hours.

[0139] The reaction temperature is 70°C.

[0140] The drying process involves a vacuum of 0.09 MPa, a temperature of 50°C, and a drying time of 5 hours.

[0141] The method for preparing the surfactant is as follows:

[0142] 16g of sodium dimercaptopropanesulfonate, 0.05g of ethylene boric anhydride pyridine complex, 200g of toluene, and 2g of triethylamine were added to a reaction vessel and reacted at 70℃ for 1h. Toluene was removed by distillation to obtain the surfactant.

[0143] Comparative Example 3

[0144] A method for modifying superhydrophilic stainless steel fillers, the operation steps of which are as follows:

[0145] S1: Weigh 80g of stainless steel filler, 100g of deionized water, 5g of 10% sodium hydroxide solution, and 1g of surfactant. Stir and mix, heat to 40℃, soak, and sonicate for 20min.

[0146] S2: Completely immerse the fully wetted stainless steel filler in the permanganate solution, and add strong acid solution dropwise;

[0147] S3: Use a metering pump to thoroughly mix the permanganate solution and the strong acid solution, while simultaneously carrying out a cyclic reaction;

[0148] S4: When the solution in S3 gradually becomes lighter and no longer changes, stop the cycle reaction and heat the reaction solution to carry out the hydrophilic oxidation reaction;

[0149] S5: After the stainless steel packing turns black, stop the reaction, wash and dry the obtained stainless steel packing to obtain superhydrophilic stainless steel modified packing.

[0150] The stainless steel packing material is preferably AISI304.

[0151] The stainless steel packing material used is a Sitta ring.

[0152] The molar ratio of the strong acid solution to the permanganate solution is 0.5:1.

[0153] The strong acid mentioned is nitric acid with a concentration of 3 mol·L⁻¹. -1 .

[0154] The permanganate may be potassium permanganate with a concentration of 1 mol·L⁻¹. -1 .

[0155] The circulating flow rate of the mixed solution within the reactor is 0.05 m / s. -1 The reaction was repeated for 8 hours.

[0156] The reaction temperature is 70°C.

[0157] The drying process involves a vacuum of 0.09 MPa, a temperature of 50°C, and a drying time of 5 hours.

[0158] The method for preparing the surfactant is as follows:

[0159] 16g sodium dimercaptopropanesulfonate, 40g castor oil maleate, 200g toluene, and 2g triethylamine were added to a reaction vessel and reacted at 70℃ for 1 hour. Toluene was removed by distillation to obtain the surfactant.

[0160] The contact angle and heavy water concentration of the packing material prepared in the above embodiments are as follows:

[0161]

[0162]

[0163] Based on the data analysis of the above embodiments and comparative examples, the stainless steel packing material prepared by the present invention has a high contact angle, indicating that it has good hydrophilicity; the stainless steel packing material prepared by the present invention has a low heavy water concentration, indicating that it has good separation performance.

[0164] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A super-hydrophilic stainless steel filler modification method, the operating steps of which are as follows: S1: 80-100 parts of stainless steel filler, 100-150 parts of deionized water, 5-10 parts of sodium hydroxide solution with a mass concentration of 10-20%, and 1-3 parts of surfactant are weighed by weight parts, stirred and mixed, heated to 40-60 DEG C, soaked, and ultrasonicated for 20-40 min; S2: The completely soaked stainless steel filler is completely immersed in a permanganate solution, and a strong acid solution is added dropwise; S3: A metering pump is used to mix the permanganate solution and the strong acid solution, and a circulating reaction is carried out at the same time; S4: When the solution in S3 gradually becomes lighter and no longer changes, the circulating reaction is stopped, and the reaction liquid is heated to carry out a hydrophilic oxidation reaction; S5: After the stainless steel filler becomes black, the reaction is stopped, and the obtained stainless steel filler is washed and dried to obtain a super-hydrophilic stainless steel modified filler; The preparation method of the surfactant is as follows: In a reaction kettle, 16-30 parts of sodium dimercaptopropanesulfonate, 40-80 parts of maleic acid castor oil ester, 0.05-0.2 parts of ethylene boron anhydride pyridine complex, 200-300 parts of toluene, and 2-5 parts of triethylamine are added, and the mixture is reacted at 70-80 DEG C for 1-3 h, and toluene is removed by distillation to obtain the surfactant.

2. The method for modifying a superhydrophilic stainless steel filler according to claim 1, characterized in that: The stainless steel filler is made of one of AISI304 and AISI316 materials.

3. The method for modifying a superhydrophilic stainless steel filler according to claim 1, characterized in that: The stainless steel filler is selected from bulk or structured fillers, the bulk filler is at least one of a Tetra Pak ring, a Raschig ring, a square saddle ring, a ladder ring, and a Pall ring, and the structured filler is at least one of a wire mesh corrugated filler, a spiked plate corrugated filler, a hole plate corrugated filler, and a plate net corrugated filler.

4. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The molar ratio of the strong acid solution to the permanganate solution is 0.5-5:

1.

5. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The strong acid is one or more of nitric acid and sulfuric acid, and the strong acid concentration is 3-15 mol·L-1.

6. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The permanganate is one or more of potassium permanganate and sodium permanganate, and the permanganate concentration is 1-5 mol·L-1.

7. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The circulating reaction flow rate of the mixed solution in the reactor is 0.05-0.15 m·s-1, and the circulating reaction time is 8-12 h.

8. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The reaction temperature is 70-90 DEG C.

9. The method of modifying a superhydrophilic stainless steel filler material of claim 1, wherein: The drying vacuum degree is 0.09-0.095 MPa, the temperature is 50-70 DEG C, and the time is 5-8 h.

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