Anti-static liquid filter material and production process thereof

Abstract

The application relates to the technical field of filtering materials, and particularly discloses an anti-static liquid filter material, which is prepared by the following steps: carbon nanotubes are immersed in mixed acid to obtain carboxylated carbon nanotubes; the carboxylated carbon nanotubes are modified to obtain a modified carbon nanotube intermediate; the modified carbon nanotube intermediate is subjected to a deprotection base exposure amino group to obtain a modified carbon nanotube; and finally, the modified carbon nanotube is added into a polyurethane prepolymer mixture to continue a chain extension reaction, and emulsification is carried out to obtain a liquid filter material. The carbon nanotubes are added into the polyurethane emulsion through a reaction, the conductivity of the polyurethane is increased, and the carbon nanotubes are connected to the polyurethane through chemical bonds and are not easy to fall off.

Description

Technical Field

[0001] This invention relates to the field of filter materials, specifically to an antistatic liquid filter media and its manufacturing process. Background Technology

[0002] During the use of filter materials, dust impacts the dust-facing surface, causing friction and electron transfer between the materials. Since most filter materials are made of fibers with good insulation properties, the generated charge cannot leak out and remains stationary on the dust-facing surface, forming static electricity. Although the static charge is small, its high voltage can easily cause a discharge spark. When the concentration of the mixed gas and dust in the filter bag is high, and the energy of the discharge spark is also high, an explosion or fire may occur due to the static spark.

[0003] Existing technologies typically employ antistatic treatment by applying a layer of conductive fiber mesh or surfactant to the dust-facing surface of the filter material. However, when conductive fibers or stainless steel fibers are blended with ordinary fibers, the cohesion is poor, and the brittleness during needle punching can easily damage the needles, increasing the difficulty and cost of the process. While using surfactants for antistatic treatment on the dust-facing surface of the filter material provides superior antistatic performance, the conductivity of the surface antistatic agent will decrease sharply after prolonged dust impact, thus reducing the lifespan of the antistatic filter material. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide an antistatic liquid filter material, which grafts conductive material into the liquid filter material, coats it on the surface of the base fabric during use, and after curing, the base fabric has an antistatic effect and the conductive material is not easy to fall off.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A manufacturing process for an antistatic liquid filter media includes the following steps:

[0007] Step S1: Add single-walled carbon nanotubes to a mixed acid solution, stir and heat to 95-100℃, reflux for 2 hours, cool, filter, wash and dry to obtain carboxylated carbon nanotubes.

[0008] Step S2: Add 1,3,5-triaminobenzene to acetonitrile, cool to 0-5℃, and simultaneously add p-toluenesulfonyl chloride solution and triethylamine. Keep the reaction at this temperature for 2 hours to obtain intermediate reaction solution.

[0009] Step S3: Add carboxylated carbon nanotubes to acetonitrile, add p-toluenesulfonyl chloride solution and triethylamine dropwise, react at room temperature for 1 hour, add intermediate reaction solution dropwise, react at room temperature for 2 hours, filter, wash and dry to obtain modified carbon nanotube intermediate;

[0010] Step S4: Add the modified carbon nanotube intermediate to a methanol suspension of magnesium powder, suspend and sonicate for 1 hour, add a 10% ammonium chloride solution, continue to suspend and sonicate for 0.5 hours, filter, wash with water and dry to obtain modified carbon nanotubes.

[0011] Step S5: Add modified carbon nanotubes to the polyurethane prepolymer mixture, react at 55°C for 12 hours, cool to room temperature, and add 5% ethylenediamine aqueous solution dropwise under vigorous stirring to emulsify with water, thereby obtaining modified polyurethane aqueous emulsion, i.e., liquid filter material.

[0012] As a further embodiment of the present invention: the mixed acid in step S1 is prepared by mixing 30 mL of concentrated sulfuric acid with a mass percentage concentration of 98% and 10-12 mL of concentrated nitric acid with a mass percentage concentration of 65%, wherein the ratio of single-walled carbon nanotubes: concentrated sulfuric acid: concentrated nitric acid is 1 g: 40-42 mL.

[0013] As a further aspect of the present invention: in step S2, the amount of 1,3,5-triaminobenzene: p-toluenesulfonyl chloride solution: triethylamine: acetonitrile added is 1 mmol: 1-1.15 mmol: 1-1.2 mmol: 1.2 mL.

[0014] As a further embodiment of the present invention: in step S3, the addition amount of carboxylated carbon nanotubes: p-toluenesulfonyl chloride solution: triethylamine: acetonitrile is 1g: 1.5-2.0g: 0.8-1.2g: 10mL; the washing is performed sequentially with 5% hydrochloric acid solution, 5% sodium bicarbonate solution and deionized water.

[0015] As a further aspect of the present invention: the p-toluenesulfonyl chloride solution in steps S2 and S3 is obtained by mixing p-toluenesulfonyl chloride and acetonitrile at a ratio of 100g:300mL.

[0016] As a further embodiment of the present invention: in step S4, the modified carbon nanotube intermediate: magnesium powder: methanol: 10% ammonium chloride solution is added in the following amounts: 1g: 0.5g: 10mL: 20mL.

[0017] As a further aspect of the present invention: in step S5, the mass ratio of polyurethane prepolymer mixture, modified carbon nanotubes, and ethylenediamine is 20:1:1.

[0018] As a further aspect of the present invention, the preparation process of the polyurethane prepolymer mixture used in step S5 is as follows:

[0019] Polyester diol and anionic chain extender were dehydrated and dried at 80°C for 12 hours. The dried polyester diol, diisocyanate and dibutyltin dilaurate were mixed and reacted at 90-100°C for 3 hours under nitrogen protection. Then, the dried anionic chain extender was added and reacted at 85°C for 2 hours. After dilution with acetone, the temperature was lowered to 40°C. Sodium carbonate was added and the mixture was stirred and reacted for 0.5 hours to obtain a polyurethane prepolymer mixture.

[0020] As a further aspect of the present invention: the polyester diol is any one of polybutylene adipate, polyhexane adipate, polypentylene adipate, and polycaprolactone diol; the diisocyanate is selected from any one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate; the anionic chain extender is selected from any one of dimethylolpropionic acid and dimethylolbutyric acid.

[0021] A filter media prepared by any of the above preparation methods.

[0022] The beneficial effects of this invention are:

[0023] This invention introduces carboxyl groups onto the surface of carbon nanotubes by carboxylating them. A mixed acid anhydride is formed by reacting with p-toluenesulfonyl chloride, facilitating the formation of amide bonds with amino groups to graft small molecules. The reaction of 1,3,5-triaminobenzene with p-toluenesulfonyl chloride, through controlled dropwise addition, protects two amino groups, exposing only one amino group to react with the mixed acid anhydride on the carbon nanotubes. This prevents cross-linking between carbon nanotubes due to the presence of multiple amino groups during grafting of 1,3,5-triaminobenzene with carboxylated carbon nanotubes, thus preventing aggregation. The protecting groups on 1,3,5-triaminobenzene are removed using a methanol suspension of magnesium powder, exposing the two amino groups. This allows the modified carbon nanotubes grafted with 1,3,5-triaminobenzene to act as an amino chain extender for polyurethane prepolymers, thereby organically integrating the carbon nanotubes into the polyurethane molecular chain and increasing molecular conductivity.

[0024] After modified carbon nanotubes are polymerized into polyurethane polymers via chain extension reactions, the polyurethane acquires a certain degree of conductivity. Compared to polyurethane produced by mechanically mixing carbon nanotubes, polyurethane with carbon nanotubes linked by chemical bonds exhibits better conductivity. The carbon nanotubes also remain more stable within the polyurethane polymer, making them less prone to detachment. The introduction of carbon nanotubes enhances the water resistance of the polyurethane, preventing the carbon nanotubes from detaching from the base fabric surface due to the poor water resistance of the polyurethane itself after the liquid filter media and base fabric are composited. Furthermore, the chemical bonds connecting the carbon nanotubes to the polyurethane extend the service life of the composite liquid filter media and base fabric.

[0025] This invention relates to liquid filter media. The filter media is coated onto the surface of a base fabric and cured at high temperature before it can be used. It can be selectively used for anti-static applications. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 The reaction equation for synthesizing intermediate one of this invention;

[0028] Figure 2 This is the formula for synthesizing the modified carbon nanotube intermediate of this invention;

[0029] Figure 3 This is the reaction equation for synthesizing modified carbon nanotubes according to the present invention; Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] Please see Figure 1-3 The present invention provides a modified carbon nanotube, the preparation method of which includes the following steps:

[0033] Step S1: Add 90 mL of a mixed acid solution of 98% concentrated sulfuric acid and 30 mL of 65% concentrated nitric acid to reactor A, stir and add 3 g of single-walled carbon nanotubes, heat to 95°C, reflux for 2 h, cool to room temperature, filter, wash the filter cake with deionized water until pH 5, wash once with ethanol, place the filter cake in a vacuum oven and dry at 60°C for 6 h to obtain carboxylated carbon nanotubes.

[0034] Step S2: Add 30 mL of acetonitrile and 3.1 g of 1,3,5-triaminobenzene to reaction vessel B, stir and cool to 0 °C, add 4.7 g of p-toluenesulfonyl chloride to 14 mL of acetonitrile to prepare a solution, and at the same time add the p-toluenesulfonyl chloride solution and 2.5 g of triethylamine dropwise into reaction vessel B, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine, keep the reaction at this temperature for 2 h, and obtain intermediate reaction solution for later use.

[0035] Step S3: First, add 3g of carboxylated carbon nanotubes and 30mL of acetonitrile to reaction vessel C and stir at room temperature. Then, add 4.7g of p-toluenesulfonyl chloride to 14mL of acetonitrile to prepare a solution. At the same time, add the p-toluenesulfonyl chloride solution and 2.5g of triethylamine dropwise to reaction vessel C, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine. After keeping the reaction at this temperature for 1 hour, add the intermediate reaction solution dropwise to reaction vessel C and keep the reaction at this temperature for 2 hours. Filter the solution, wash the filter cake with 5% hydrochloric acid solution until the pH reaches 2, then wash it with 5% sodium bicarbonate solution until the pH reaches 7, and then wash it once with deionized water. Place the filter cake in a vacuum oven and dry it at 60℃ for 12 hours to obtain the modified carbon nanotube intermediate.

[0036] Step S4: Add 1.5g of magnesium powder and 30mL of methanol to reactor D, stir at room temperature to form a suspension, then add 3g of modified carbon nanotube intermediate, suspend and sonicate for 1h, then add 60mL of 10% ammonium chloride solution to reactor D, continue to suspend and sonicate for 0.5h, filter, wash the filter cake with deionized water until neutral, place the filter cake in a vacuum oven and dry at 60℃ for 12h to obtain modified carbon nanotubes.

[0037] Example 2

[0038] Please see Figure 1-3 The present invention provides a modified carbon nanotube, the preparation method of which includes the following steps:

[0039] Step S1: Add 90 mL of a mixed acid solution of 98% concentrated sulfuric acid and 33 mL of 65% concentrated nitric acid to reactor A, stir and add 3 g of single-walled carbon nanotubes, heat to 95°C, reflux for 2 h, cool to room temperature, filter, wash the filter cake with deionized water until pH 5.5, wash once with ethanol, place the filter cake in a vacuum oven and dry at 60°C for 6 h to obtain carboxylated carbon nanotubes.

[0040] Step S2: Add 30 mL of acetonitrile and 3.1 g of 1,3,5-triaminobenzene to reaction vessel B, stir and cool to 2 °C, add 5.2 g of p-toluenesulfonyl chloride to 15 mL of acetonitrile to prepare a solution, and at the same time add the p-toluenesulfonyl chloride solution and 2.8 g of triethylamine dropwise into reaction vessel B, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine, and keep the reaction at this temperature for 2 h to obtain intermediate reaction solution.

[0041] Step S3: First, add 3g of carboxylated carbon nanotubes and 30mL of acetonitrile to reaction vessel C and stir at room temperature. Then, add 5.2g of p-toluenesulfonyl chloride to 15mL of acetonitrile to prepare a solution. At the same time, add the p-toluenesulfonyl chloride solution and 2.8g of triethylamine dropwise to reaction vessel C, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine. After keeping the reaction at this temperature for 1 hour, add the intermediate reaction solution dropwise to reaction vessel C and keep the reaction at this temperature for 2 hours. Filter the solution, wash the filter cake with 5% hydrochloric acid solution until the pH reaches 2.5, then wash it with 5% sodium bicarbonate solution until the pH reaches 7.5, and then wash it once with deionized water. Place the filter cake in a vacuum oven and dry it at 60℃ for 12 hours to obtain the modified carbon nanotube intermediate.

[0042] Step S4: Add 1.5g of magnesium powder and 30mL of methanol to reactor D, stir at room temperature to form a suspension, then add 3g of modified carbon nanotube intermediate, suspend and sonicate for 1h, then add 60mL of 10% ammonium chloride solution to reactor D, continue to suspend and sonicate for 0.5h, filter, wash the filter cake with deionized water until neutral, place the filter cake in a vacuum oven and dry at 60℃ for 12h to obtain modified carbon nanotubes.

[0043] Example 3

[0044] Please see Figure 1-3 The present invention provides a modified carbon nanotube, the preparation method of which includes the following steps:

[0045] Step S1: Add 90 mL of a mixed acid solution of 98% concentrated sulfuric acid and 36 mL of 65% concentrated nitric acid to reactor A, stir and add 3 g of single-walled carbon nanotubes, heat to 100℃, reflux for 2 h, cool to room temperature, filter, wash the filter cake with deionized water until pH 6, wash once with ethanol, place the filter cake in a vacuum oven and dry at 60℃ for 6 h to obtain carboxylated carbon nanotubes.

[0046] Step S2: Add 30 mL of acetonitrile and 3.1 g of 1,3,5-triaminobenzene to reaction vessel B, stir and cool to 5 °C. Add 5.4 g of p-toluenesulfonyl chloride to 16 mL of acetonitrile to prepare a solution. At the same time, add the p-toluenesulfonyl chloride solution and 3 g of triethylamine dropwise to reaction vessel B, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine. Keep the reaction at this temperature for 2 h to obtain intermediate reaction solution, which is then ready for use.

[0047] Step S3: First, add 3g of carboxylated carbon nanotubes and 30mL of acetonitrile to reaction vessel C and stir at room temperature. Then, add 5.4g of p-toluenesulfonyl chloride to 16mL of acetonitrile to prepare a solution. At the same time, add the p-toluenesulfonyl chloride solution and 3g of triethylamine dropwise to reaction vessel C, controlling the dropwise addition time of the p-toluenesulfonyl chloride solution to be longer than that of the triethylamine. After keeping the reaction at this temperature for 1 hour, add the intermediate reaction solution dropwise to reaction vessel C and keep the reaction at this temperature for 2 hours. Filter the solution, wash the filter cake with 5% hydrochloric acid solution until the pH reaches 3, then wash it with 5% sodium bicarbonate solution until the pH reaches 8, and then wash it once with deionized water. Place the filter cake in a vacuum oven and dry it at 60℃ for 12 hours to obtain the modified carbon nanotube intermediate.

[0048] Step S4: Add 1.5g of magnesium powder and 30mL of methanol to reactor D, stir at room temperature to form a suspension, then add 3g of modified carbon nanotube intermediate, suspend and sonicate for 1h, then add 60mL of 10% ammonium chloride solution to reactor D, continue to suspend and sonicate for 0.5h, filter, wash the filter cake with deionized water until neutral, place the filter cake in a vacuum oven and dry at 60℃ for 12h to obtain modified carbon nanotubes.

[0049] Example 4

[0050] The present invention provides a polyurethane prepolymer mixture, the preparation method of which includes the following steps:

[0051] Polycaprolactone diol (molecular weight 2000) and dimethylolpropionic acid were pre-dehydrated and dried at 80°C for 12 hours. 50g of polycaprolactone diol, 22.2g of isophorone diisocyanate, and 0.3g of dibutyltin dilaurate were added to reactor E. Under nitrogen protection, the mixture was stirred and heated to 90-100°C for 3 hours. The temperature was then lowered to 85°C, and 2.5g of dimethylolpropionic acid was added to reactor E for chain extension reaction for 2 hours. 25g of acetone was added for dilution, and the temperature was lowered to 40°C. 3g of sodium carbonate was added, and the mixture was stirred and reacted for 0.5 hours. After complete salt formation, a polyurethane prepolymer mixture was obtained.

[0052] Example 5

[0053] The present invention provides a liquid filter material, the preparation method of which includes the following steps:

[0054] 100g of the polyurethane prepolymer mixture prepared in Example 4 was added to reactor F, and 5g of the modified carbon nanotubes prepared in Example 1 were added while stirring. The mixture was heated to 55°C and reacted for 12 hours. After cooling to room temperature, 100mL of 5% ethylenediamine aqueous solution was added dropwise under vigorous stirring to emulsify the mixture and obtain a modified polyurethane aqueous emulsion, i.e., liquid filter material.

[0055] Example 6

[0056] The present invention provides a liquid filter material, the preparation method of which includes the following steps:

[0057] 100g of the polyurethane prepolymer mixture prepared in Example 4 was added to reactor F, and 5g of the modified carbon nanotubes prepared in Example 2 were added while stirring. The mixture was heated to 55°C and reacted for 12 hours. After cooling to room temperature, 100mL of 5% ethylenediamine aqueous solution was added dropwise under vigorous stirring to emulsify the mixture and obtain a modified polyurethane aqueous emulsion, i.e., liquid filter material.

[0058] Example 7

[0059] The present invention provides a liquid filter material, the preparation method of which includes the following steps:

[0060] 100g of the polyurethane prepolymer mixture prepared in Example 4 was added to reactor F, and 5g of the modified carbon nanotubes prepared in Example 3 were added while stirring. The mixture was heated to 55°C and reacted for 12 hours. After cooling to room temperature, 100mL of 5% ethylenediamine aqueous solution was added dropwise under vigorous stirring to emulsify the mixture and obtain a modified polyurethane aqueous emulsion, i.e., liquid filter material.

[0061] Comparative Example 1

[0062] A polytetrafluoroethylene membrane filter material, purchased from Suzhou Youkefa New Material Technology Co., Ltd.

[0063] Comparative Example 2

[0064] A modified polytetrafluoroethylene membrane filter material is obtained by coating the polyurethane prepolymer mixture prepared in Example 4 onto the polytetrafluoroethylene membrane filter material in Comparative Example 1 and curing it at high temperature.

[0065] Comparative Example 3

[0066] A carbon nanotube-modified polytetrafluoroethylene membrane filter material is obtained by mechanically mixing 5% (mass fraction) of single-walled carbon nanotubes into a polyurethane prepolymer mixture prepared in Example 4, coating it onto the polytetrafluoroethylene membrane filter material in Comparative Example 1, and then curing it at high temperature.

[0067] Performance testing

[0068] The liquid filter material prepared according to the present invention was coated on the surface of the polytetrafluoroethylene filter material in Comparative Example 1, and after high-temperature curing, the following tests were performed:

[0069] (1) Tensile strength test

[0070] Samples of 10mm × 150mm were taken, washed 10 times with water, and dried. Tensile strength was tested using a HY-932CS electronic fabric tensile testing machine from Tianjin Nikos Testing Technology Co., Ltd. The test results are shown in Table 1.

[0071] Table 1: Tensile Strength Test

[0072]

[0073] As shown in Table 1, the filter media with added carbon nanotubes exhibited a smaller decrease in tensile strength after water washing, indicating that the addition of carbon nanotubes improved the water resistance of polyurethane. Compared to filter media with ordinary mixed carbon nanotubes, the filter media of this invention, which uses chemically grafted carbon nanotubes, has higher tensile strength and a smaller decrease in tensile strength after water washing, indicating that chemically bonded carbon nanotubes can exist more firmly in the filter media. In summary, the liquid filter media of this invention shows a significant increase in tensile strength after being coated onto the surface of polytetrafluoroethylene (PTFE), indicating that the coating effect of the filter media on the PTFE membrane surface is good.

[0074] (2) Surface resistance test

[0075] According to the evaluation standard for electrostatic properties of textiles (national standard number GB / T12703.4-2010), the conductivity of the filter material was tested. The sample was washed with water 10 times and then dried before testing. The test results are shown in Table 2:

[0076] Table 2: Surface Resistance Test

[0077]

[0078] As shown in Table 2, the surface resistance of the filter media with added carbon nanotubes increased less after water washing, indicating that the addition of carbon nanotubes improved the water resistance of polyurethane, and the antistatic ability was less affected by the number of uses. Compared with ordinary mixed carbon nanotube filter media, the filter media of this invention with chemically grafted carbon nanotubes has even lower surface resistance and a smaller increase in surface resistance after water washing, indicating that the chemically bonded carbon nanotubes can exist more firmly in the filter media, resulting in better conductivity and greater durability. In summary, the liquid filter media of this invention has a low surface resistance after being coated on the polytetrafluoroethylene surface, significantly improving the antistatic ability of the filter media. Furthermore, the surface resistance changes little after multiple water washes, indicating that the chemically bonded carbon nanotubes can exist stably in the filter media, are not easily detached, and have a longer service life.

[0079] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A production process for an antistatic liquid filter material, characterized in that, Includes the following steps: Step S1: Add single-walled carbon nanotubes to a mixed acid solution, stir and heat to 95-100℃, reflux for 2 hours, cool, filter, wash and dry to obtain carboxylated carbon nanotubes. Step S2: Add 1,3,5-triaminobenzene to acetonitrile, cool to 0-5℃, and simultaneously add p-toluenesulfonyl chloride solution and triethylamine. Keep the reaction at this temperature for 2 hours to obtain intermediate reaction solution. Step S3: Add carboxylated carbon nanotubes to acetonitrile, add p-toluenesulfonyl chloride solution and triethylamine dropwise, react at room temperature for 1 hour, add intermediate reaction solution dropwise, react at room temperature for 2 hours, filter, wash and dry to obtain modified carbon nanotube intermediate; Step S4: Add the modified carbon nanotube intermediate to a methanol suspension of magnesium powder, suspend and sonicate for 1 hour, add a 10% ammonium chloride solution, continue to suspend and sonicate for 0.5 hours, filter, wash with water and dry to obtain modified carbon nanotubes. Step S5: Add modified carbon nanotubes to the polyurethane prepolymer mixture, react at 55°C for 12 hours, cool to room temperature, and add 5% ethylenediamine aqueous solution dropwise under vigorous stirring to emulsify with water, thereby obtaining modified polyurethane aqueous emulsion, i.e. liquid filter material. The preparation process of the polyurethane prepolymer mixture used in step S5 is as follows: Polyester diol and anionic chain extender were dehydrated and dried at 80°C for 12 hours. The dried polyester diol, diisocyanate and dibutyltin dilaurate were mixed and reacted at 90-100°C for 3 hours under nitrogen protection. Then, the dried anionic chain extender was added and reacted at 85°C for 2 hours. After dilution with acetone, the temperature was lowered to 40°C. Sodium carbonate was added and the mixture was stirred and reacted for 0.5 hours to obtain a polyurethane prepolymer mixture.

2. The production process of an antistatic liquid filter material according to claim 1, characterized in that, In step S1, the mixed acid is prepared by mixing 30 mL of concentrated sulfuric acid with a mass percentage concentration of 98% and 10-12 mL of concentrated nitric acid with a mass percentage concentration of 65%. The ratio of single-walled carbon nanotubes to mixed acid is 1 g: 40-42 mL.

3. The production process of an antistatic liquid filter material according to claim 1, characterized in that, In both steps S2 and S3, the p-toluenesulfonyl chloride solution was obtained by mixing p-toluenesulfonyl chloride and acetonitrile at a ratio of 100g:300mL; in step S2, the addition ratio of 1,3,5-triaminobenzene: p-toluenesulfonyl chloride solution: triethylamine: acetonitrile was 1mmol: 1-1.15mmol: 1-1.2mmol: 1.2mL.

4. The production process of an antistatic liquid filter material according to claim 1, characterized in that, In step S3, the addition ratio of carboxylated carbon nanotubes: p-toluenesulfonyl chloride solution: triethylamine: acetonitrile is 1g: 1.5-2.0g: 0.8-1.2g: 10mL; washing is performed sequentially with 5% hydrochloric acid solution, 5% sodium bicarbonate solution and deionized water.

5. The production process of an antistatic liquid filter material according to claim 1, characterized in that, In step S4, the modified carbon nanotube intermediate is added in the following proportions: magnesium powder: methanol: 10% ammonium chloride solution (mass percentage concentration) at a ratio of 1g: 0.5g: 10mL: 20mL.

6. The production process of an antistatic liquid filter material according to claim 1, characterized in that, In step S5, the mass ratio of polyurethane prepolymer mixture: modified carbon nanotubes: ethylenediamine is 20:1:

1.

7. The production process of an antistatic liquid filter material according to claim 1, characterized in that, The polyester diol is any one of polybutylene adipate, polyhexane adipate, neopentyl adipate, and polycaprolactone diol; the diisocyanate is selected from any one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate; the anionic chain extender is selected from any one of dimethylolpropionic acid and dimethylolbutyric acid.

8. A filter media, characterized in that, It is prepared by any of the production processes described in claims 1-7.

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