A self-charging filter material based on nano-wool particles and a preparation method thereof

Abstract

The application discloses a preparation method of self-charging filter material based on nano wool particles, and comprises the following steps: immersing nano wool particles into a graphene modifier for immersion improvement treatment to obtain immersion-improved nano wool particles; mixing the immersion-improved nano wool particles, polyester and nano modifier according to a weight ratio to form a composite spinning liquid; performing centrifugal spinning treatment on the composite spinning liquid to obtain a composite fiber body; and performing ultrasonic improvement treatment on the composite fiber body and polyester fiber in a coupling adjusting liquid, and then performing hot pressing to obtain the self-charging filter material. The nano wool particles are subjected to the immersion improvement treatment by using the graphene modifier, the immersion-improved wool nano fiber is matched by using the graphene modifier, the spinning liquid is formed by further mixing the wool nano fiber, the polyester and the nano modifier, the spinning treatment is performed on the spinning liquid, the coupling adjusting liquid is used to coordinate the composite fiber body and the polyester fiber, and the filtering efficiency and the dust holding capacity of the self-charging filter material are improved.

Description

Technical Field

[0001] This invention relates to the field of filter materials technology, specifically to a self-charging filter material based on nano-wool particles and its preparation method. Background Technology

[0002] Fine particulate matter has become one of the most important air pollutants, posing a serious threat to human health. Therefore, how to effectively prevent industrial particulate matter from entering the atmosphere and how to prevent particulate matter in the atmosphere from being absorbed by the human body are urgent problems to be solved.

[0003] It is difficult to improve the filtration efficiency and dust holding capacity of existing charging filter materials in a coordinated manner. At the same time, the performance stability of the product deteriorates after washing and prolonged storage, which limits the product's efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a self-charging filter material based on nano-wool particles and its preparation method, thereby solving the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a method for preparing a self-charging filter material based on nanofiber wool particles, comprising the following steps:

[0007] Step 1: Immerse the nano-wool particles in a graphene modifier that is 3-5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles.

[0008] Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution;

[0009] Step 3: Centrifugal spinning is performed using the composite spinning solution to obtain composite fiber body;

[0010] Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add 5-10% sodium dodecylbenzenesulfonate of the total amount of silane coupling agent and continue mixing thoroughly to obtain the coupling conditioning solution.

[0011] Step 5: The composite fiber body and the 500nm diameter polyester fiber are ultrasonically improved in the coupling conditioning solution. After the treatment is completed, they are filtered and dried. Then, the treated composite fiber body and the 500nm diameter polyester fiber are hot-pressed at a weight ratio of 0.7:1 to obtain the self-charging filter material.

[0012] Preferably, the immersion pressure of the immersion improvement treatment is 10-15 MPa, and the immersion time is 20-30 min.

[0013] Preferably, the graphene modifier is prepared by:

[0014] S01: Heat the graphene at 210-230℃ for 10-15 min, then cool it to 105-110℃ at a rate of 1-3℃ / min, hold it at that temperature for 5-10 min, and finally air cool it to room temperature.

[0015] S02: 5-10 parts of treated graphene, 2-5 parts of lanthanum chloride solution, 1-3 parts of glycolic acid and 2-4 parts of nano-silica sol are ball-milled at a speed of 1000-1500 r / min for 1-2 h. After ball milling, the mixture is washed with water and dried to obtain the treated and improved graphene agent.

[0016] S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier.

[0017] Preferably, the lanthanum chloride solution has a mass fraction of 2-5%.

[0018] Preferably, the whisker solution comprises the following raw materials in parts by weight:

[0019] 2-5 parts silicon carbide whiskers, 4-7 parts sodium lignosulfonate solution, 1-3 parts urea, 6-10 parts deionized water, and 2-5 parts sodium citrate.

[0020] Preferably, the sodium lignosulfonate solution has a mass fraction of 10-15%.

[0021] Preferably, the preparation method of the nano-modifier is as follows:

[0022] S101: The nano-wollastonite is first irradiated with protons at a power of 100-200W for 1-2 hours. After the irradiation is completed, the irradiated nano-wollastonite agent is obtained.

[0023] S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

[0024] Preferably, the chitosan solution has a mass fraction of 4-8%; the silane coupling agent is silane coupling agent KH560.

[0025] Preferably, the ultrasonic power of the ultrasonic improvement treatment is 350-400W, and the ultrasonic time is 1-2h.

[0026] The present invention also provides a method for preparing a self-charging filter material based on nano-wool particles.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The wool nanofibers of this invention are improved by immersion in graphene modifier. The immersion-modified wool nanofibers are then formulated and co-blended with graphene modifier, and then formed into a spinning solution with polyester and nano-modifier. After centrifugal spinning, the composite fiber body and 500nm diameter polyester fibers are coordinated with a coupling conditioning liquid. The coupling conditioning liquid contains silane coupling agent, chitosan solution and sodium dodecylbenzenesulfonate, which are blended and co-blended to enhance the interfacial properties and activity of the system. As a result, the filtration efficiency and dust holding capacity of the self-charging filter material of the product are improved in a coordinated manner. At the same time, the product has significant performance stability under water washing and long-term storage. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0030] The preparation method of the self-charging filter material based on nano-wool particles of the present invention includes the following steps:

[0031] Step 1: Immerse the nano-wool particles in a graphene modifier that is 3-5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles.

[0032] Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution;

[0033] Step 3: Centrifugal spinning is performed using a composite spinning solution (centrifugal spinning ambient temperature is 30-45℃, centrifugal spinning equipment parameters: spinning speed is 2000-5000rpm, spinning needle diameter is 0.16-0.24mm, and collection height is 3-6cm) to obtain composite fibers with a diameter of about 5um.

[0034] Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add 5-10% sodium dodecylbenzenesulfonate of the total amount of silane coupling agent and continue mixing thoroughly to obtain the coupling conditioning solution.

[0035] Step 5: The composite fiber body and the 500nm diameter polyester fiber are ultrasonically improved in the coupling conditioning solution. After the treatment is completed, they are filtered and dried. Then, the treated composite fiber body and the 500nm diameter polyester fiber are hot-pressed at a weight ratio of 0.7:1 to obtain the self-charging filter material.

[0036] The immersion pressure for the improved immersion treatment was 10-15 MPa, and the immersion time was 20-30 min.

[0037] In some embodiments, the graphene modifier is prepared by:

[0038] S01: Heat the graphene at 210-230℃ for 10-15 min, then cool it to 105-110℃ at a rate of 1-3℃ / min, hold it at that temperature for 5-10 min, and finally air cool it to room temperature.

[0039] S02: 5-10 parts of treated graphene, 2-5 parts of lanthanum chloride solution, 1-3 parts of glycolic acid and 2-4 parts of nano-silica sol are ball-milled at a speed of 1000-1500 r / min for 1-2 h. After ball milling, the mixture is washed with water and dried to obtain the treated and improved graphene agent.

[0040] S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier.

[0041] Specifically, the lanthanum chloride solution has a mass fraction of 2-5%; the whisker solution includes the following raw materials by weight: 2-5 parts silicon carbide whiskers, 4-7 parts sodium lignosulfonate solution, 1-3 parts urea, 6-10 parts deionized water, and 2-5 parts sodium citrate.

[0042] Specifically, the mass fraction of the sodium lignosulfonate solution is 10-15%.

[0043] The preparation method of the nano-modifier is as follows:

[0044] S101: The nano-wollastonite is first irradiated with protons at a power of 100-200W for 1-2 hours. After the irradiation is completed, the irradiated nano-wollastonite agent is obtained.

[0045] S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

[0046] Specifically, the chitosan solution has a mass fraction of 4-8%; the silane coupling agent is silane coupling agent KH560.

[0047] Specifically, the ultrasonic power for ultrasonic improvement treatment is 350-400W, and the ultrasonic time is 1-2 hours.

[0048] Meanwhile, the present invention also provides a self-charging filter material prepared by the above-mentioned method for preparing self-charging filter materials based on nano-wool particles.

[0049] Example 1

[0050] The preparation method of the self-charging filter material based on nano-wool particles in this embodiment includes the following steps:

[0051] Step 1: Immerse the nano-wool particles in a graphene modifier that is 3-5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles.

[0052] Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution;

[0053] Step 3: Centrifugal spinning is performed using a composite spinning solution (centrifugal spinning ambient temperature is 30℃, centrifugal spinning equipment parameters: spinning speed is 3500rpm, spinning needle diameter is 0.2mm, and collection height is 4cm) to obtain composite fibers with a diameter of about 5um.

[0054] Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add 5% sodium dodecylbenzenesulfonate of the total silane coupling agent and continue mixing thoroughly to obtain the coupling conditioning solution.

[0055] Step 5: The composite fiber body and the 500nm diameter polyester fiber are ultrasonically improved in the coupling conditioning solution. After the treatment is completed, they are filtered and dried. Then, the treated composite fiber body and the 500nm diameter polyester fiber are hot-pressed at a weight ratio of 0.7:1 to obtain the self-charging filter material.

[0056] In this embodiment, the immersion pressure for the improved immersion treatment is 10 MPa, and the immersion time is 20 min.

[0057] The preparation method of the graphene modifier in this embodiment is as follows:

[0058] S01: Graphene is first heat-treated at 210℃ for 10 min, then cooled to 105℃ at a rate of 1℃ / min, held for 5 min, and finally air-cooled to room temperature.

[0059] S02: Five parts of treated graphene, two parts of lanthanum chloride solution, one part of glycolic acid and two parts of nano-silica sol were ball-milled at 1000 r / min for 1 h. After ball milling, the mixture was washed with water and dried to obtain the treated and improved graphene agent.

[0060] S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier.

[0061] The lanthanum chloride solution in this embodiment has a mass fraction of 2%.

[0062] The whisker solution in this embodiment comprises the following raw materials in parts by weight:

[0063] 2 parts silicon carbide whiskers, 4 parts sodium lignosulfonate solution, 1 part urea, 6 parts deionized water, and 2 parts sodium citrate.

[0064] The sodium lignosulfonate solution in this embodiment has a mass fraction of 10%.

[0065] The preparation method of the nano-modifier in this embodiment is as follows:

[0066] S101: The nano-wollastonite was first irradiated with protons at a power of 100W for 1 hour. After the irradiation was completed, the irradiated nano-wollastonite agent was obtained.

[0067] S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

[0068] In this embodiment, the chitosan solution has a mass fraction of 4%; the silane coupling agent is silane coupling agent KH560.

[0069] In this embodiment, the ultrasonic power of the ultrasonic improvement process is 350W, and the ultrasonic time is 1 hour.

[0070] Example 2

[0071] The preparation method of the self-charging filter material based on nano-wool particles in this embodiment includes the following steps:

[0072] Step 1: Immerse the nano-wool particles in a graphene modifier that is 5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles.

[0073] Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution;

[0074] Step 3: Centrifugal spinning is performed using a composite spinning solution (centrifugal spinning ambient temperature is 35℃, centrifugal spinning equipment parameters: spinning speed is 4000rpm, spinning needle diameter is 0.22mm, and collection height is 5cm) to obtain composite fibers with a diameter of about 5um.

[0075] Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add sodium dodecylbenzenesulfonate (10% of the total silane coupling agent) and continue mixing thoroughly to obtain the coupling conditioning solution.

[0076] Step 5: The composite fiber body and the 500nm diameter polyester fiber are ultrasonically improved in the coupling conditioning solution. After the treatment is completed, they are filtered and dried. Then, the treated composite fiber body and the 500nm diameter polyester fiber are hot-pressed at a weight ratio of 0.7:1 to obtain the self-charging filter material.

[0077] In this embodiment, the immersion pressure for the improved immersion treatment is 15 MPa, and the immersion time is 30 min.

[0078] The preparation method of the graphene modifier in this embodiment is as follows:

[0079] S01: Graphene is first heat-treated at 230℃ for 15 minutes, then cooled to 110℃ at a rate of 3℃ / min, held for 10 minutes, and finally air-cooled to room temperature.

[0080] S02: 10 parts of treated graphene, 5 parts of lanthanum chloride solution, 3 parts of glycolic acid and 4 parts of nano-silica sol were ball-milled at 1500 r / min for 2 h. After ball milling, the mixture was washed with water and dried to obtain the treated and improved graphene agent.

[0081] S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier.

[0082] The lanthanum chloride solution in this embodiment has a mass fraction of 5%.

[0083] The whisker solution in this embodiment comprises the following raw materials in parts by weight:

[0084] 5 parts silicon carbide whiskers, 7 parts sodium lignosulfonate solution, 3 parts urea, 10 parts deionized water, and 5 parts sodium citrate.

[0085] The sodium lignosulfonate solution in this embodiment has a mass fraction of 15%.

[0086] The preparation method of the nano-modifier in this embodiment is as follows:

[0087] S101: Nano-wollastonite is first irradiated with protons at a power of 200W for 2 hours. After the irradiation is completed, an irradiated nano-wollastonite agent is obtained.

[0088] S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

[0089] In this embodiment, the chitosan solution has a mass fraction of 8%; the silane coupling agent is silane coupling agent KH560.

[0090] In this embodiment, the ultrasonic power of the ultrasonic improvement process is 400W, and the ultrasonic time is 2h.

[0091] Example 3

[0092] The preparation method of the self-charging filter material based on nano-wool particles in this embodiment includes the following steps:

[0093] Step 1: Immerse the nano-wool particles in a graphene modifier that is 3-5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles.

[0094] Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution;

[0095] Step 3: Centrifugal spinning is performed using a composite spinning solution (centrifugal spinning ambient temperature is 35℃, centrifugal spinning equipment parameters: spinning speed is 4500rpm, spinning needle diameter is 0.18mm, and collection height is 6cm) to obtain composite fibers with a diameter of about 5um.

[0096] Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add sodium dodecylbenzenesulfonate (7.5% of the total silane coupling agent) and continue mixing thoroughly to obtain the coupling conditioning solution.

[0097] Step 5: The composite fiber body and the 500nm diameter polyester fiber are ultrasonically improved in the coupling conditioning solution. After the treatment is completed, they are filtered and dried. Then, the treated composite fiber body and the 500nm diameter polyester fiber are hot-pressed at a weight ratio of 0.7:1 to obtain the self-charging filter material.

[0098] In this embodiment, the immersion pressure for the improved immersion treatment is 12.5 MPa, and the immersion time is 25 min.

[0099] The preparation method of the graphene modifier in this embodiment is as follows:

[0100] S01: Graphene is first heat-treated at 220℃ for 12.5 min, then cooled to 107℃ at a rate of 2℃ / min, held for 7.5 min, and finally air-cooled to room temperature;

[0101] S02: 7.5 parts of treated graphene, 3.5 parts of lanthanum chloride solution, 2 parts of glycolic acid and 3 parts of nano-silica sol were ball-milled at 1250 r / min for 1.5 h. After ball milling, the mixture was washed with water and dried to obtain the treated and improved graphene agent.

[0102] S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier.

[0103] The lanthanum chloride solution in this embodiment has a mass fraction of 3.5%.

[0104] The whisker solution in this embodiment comprises the following raw materials in parts by weight:

[0105] 3.5 parts silicon carbide whiskers, 5 parts sodium lignosulfonate solution, 2 parts urea, 8 parts deionized water, and 3.5 parts sodium citrate.

[0106] The sodium lignosulfonate solution in this embodiment has a mass fraction of 12.5%.

[0107] The preparation method of the nano-modifier in this embodiment is as follows:

[0108] S101: The nano-wollastonite was first irradiated with protons at a power of 150W for 1.5h. After the irradiation was completed, the irradiated nano-wollastonite agent was obtained.

[0109] S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

[0110] In this embodiment, the chitosan solution has a mass fraction of 6%; the silane coupling agent is silane coupling agent KH560.

[0111] In this embodiment, the ultrasonic power of the ultrasonic improvement treatment is 370W, and the ultrasonic time is 1.5h.

[0112] Comparative Example 1

[0113] Unlike Example 3, this one did not undergo the immersion modification treatment in the graphene modifier.

[0114] Comparative Example 2

[0115] Unlike Example 3, SO2 treatment was not used in the preparation of the graphene modifier.

[0116] Comparative Example 3

[0117] Unlike Example 3, whisker solution treatment was not used in the preparation of the graphene modifier.

[0118] Comparative Example 4

[0119] Unlike Example 3, sodium lignosulfonate solution and urea were not added to the whisker solution.

[0120] Comparative Example 5

[0121] Unlike Example 3, no silicon carbide whiskers were added to the whisker solution.

[0122] Comparative Example 6

[0123] Unlike Example 3, no nano-modifier was used.

[0124] Comparative Example 7

[0125] Unlike Example 3, the nano-modifier was not treated with S102.

[0126] Comparative Example 8

[0127] Unlike Example 3, no coupling conditioning solution was used.

[0128] The products from Examples 1-3 and Comparative Examples 1-8 were subjected to routine performance tests. The performance of the products was also tested after 10 washes and after being stored at room temperature for 100 days. The test results are as follows.

[0129]

[0130] As can be seen from Comparative Examples 1-8 and Examples 1-3;

[0131] The product in Example 3 has excellent filtration efficiency and dust holding capacity, and the two properties can be improved in a coordinated manner; at the same time, the product's performance stability is significant under water washing and long-term storage.

[0132] As can be seen from Comparative Examples 1-8 and Example 3, the performance of the product deteriorates significantly when one of the following treatments is not used: immersion improvement treatment with graphene modifier, treatment with nano-modifier, or treatment with coupling conditioning liquid. The product performance is most significantly improved when all three are used in combination for synergistic effect.

[0133] In the preparation of graphene modifiers, the absence of SO2 treatment, whisker solution treatment, addition of sodium lignosulfonate solution or urea to the whisker solution, and addition of silicon carbide whiskers to the whisker solution, as well as the absence of SO2 treatment in nano-modifiers, all resulted in a deterioration in product performance. Only the graphene modifiers and nano-modifiers prepared using the method of this invention exhibited the most significant performance improvement. When other methods were used as substitutes, the performance of the products tended to deteriorate. Only the raw materials prepared using the method of this invention showed the most obvious performance improvement.

[0134] It should be noted that in the processing of this invention, the graphene modifier is heat-treated with graphene, then cooled to a certain temperature and held at that temperature to optimize its activity. Then, it is further improved by ball milling with lanthanum chloride solution, glycolic acid, and nano-silica sol, resulting in further enhanced graphene activity. This enhances the synergistic effect with the whisker solution. The silicon carbide whiskers, sodium lignosulfonate solution, urea, and sodium citrate in the whisker solution work together. Through the whisker structure, the synergistic effect between the whiskers and graphene is optimized by the coordination of the sodium lignosulfonate solution and urea. The graphene sheet structure is interspersed in the system, working in conjunction with the whisker dispersion system to optimize the system's stability. Furthermore, the nano-modifier is made by proton irradiation of nano-wollastonite, followed by stirring and mixing with yttrium nitrate solution. This further enhances the synergistic effect between the improved nano-wollastonite and the graphene modifier, resulting in further improved product performance and stability.

[0135] The invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.

[0136] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a self-charging filter material based on nanofiber wool particles, characterized in that, Includes the following steps: Step 1: Immerse the nano-wool particles in a graphene modifier that is 3-5 times the weight of the total amount of wool nanofibers for immersion and improvement treatment. After immersion, filter and dry to obtain the improved nano-wool particles. Step 2: Mix the improved nano-wool particles, polyester with a melting point of 200℃, and nano-modifier in a weight ratio of 2:5:1 to form a composite spinning solution; Step 3: Perform centrifugal spinning using the composite spinning solution to obtain composite fiber body; Step 4: Mix the silane coupling agent and chitosan solution at a weight ratio of 2:5, then add 5-10% sodium dodecylbenzenesulfonate of the total amount of silane coupling agent and continue mixing thoroughly to obtain the coupling conditioning solution. Step 5: The composite fiber body and 500nm diameter polyester fibers are ultrasonically treated in a coupling conditioning solution. After treatment, they are filtered and dried. Then, the treated composite fiber body and 500nm diameter polyester fibers are hot-pressed at a weight ratio of 0.7:1 to obtain a self-charging filter material. The preparation method of the graphene modifier is as follows: S01: Heat the graphene at 210-230℃ for 10-15 min, then cool it to 105-110℃ at a rate of 1-3℃ / min, hold it at that temperature for 5-10 min, and finally air cool it to room temperature. S02: 5-10 parts of treated graphene, 2-5 parts of lanthanum chloride solution, 1-3 parts of glycolic acid and 2-4 parts of nano-silica sol are ball-milled at a speed of 1000-1500 r / min for 1-2 h. After ball milling, the mixture is washed with water and dried to obtain the treated and improved graphene agent. S03: The modified graphene agent and whisker solution are mixed at a weight ratio of 1:

5. After mixing, the mixture is washed with water and dried to obtain the graphene modifier. The whisker solution comprises the following raw materials in parts by weight: 2-5 parts silicon carbide whiskers, 4-7 parts sodium lignosulfonate solution, 1-3 parts urea, 6-10 parts deionized water, and 2-5 parts sodium citrate.

2. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The immersion pressure for the improved immersion treatment is 10-15 MPa, and the immersion time is 20-30 min.

3. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The lanthanum chloride solution has a mass fraction of 2-5%.

4. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The sodium lignosulfonate solution has a mass fraction of 10-15%.

5. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The preparation method of the nano-modifier is as follows: S101: The nano-wollastonite is first irradiated with protons at a power of 100-200W for 1-2 hours. After the irradiation is completed, the irradiated nano-wollastonite agent is obtained. S102: Irradiated nano-wollastonite agent and 5% yttrium nitrate solution are mixed at a weight ratio of 1:5, then washed with water and dried to obtain nano-modifier.

6. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The chitosan solution has a mass fraction of 4-8%; the silane coupling agent is silane coupling agent KH560.

7. The method for preparing the self-charging filter material based on nano-wool particles according to claim 1, characterized in that, The ultrasonic power of the ultrasonic improvement treatment is 350-400W, and the ultrasonic time is 1-2h.

8. A self-charging filter material prepared by the preparation method of the self-charging filter material based on nano-wool particles as described in any one of claims 1-7.

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