Antibacterial nonwoven fabric material using amide derivative monomer as polymerization raw material, method for producing the same, and product produced thereby

Abstract

This invention provides a nonwoven fabric material with antibacterial function made from polymer raw materials containing amide derivative monomers, its preparation method, and the product obtained therefrom. The method includes the following steps: A) Preparing masterbatch: In a mixer, polypropylene granules and acrylamide derivative monomers are added sequentially and stirred until uniformly mixed to obtain a masterbatch mixture; then subjected to irradiation, extraction, and halogenation; B) Mixing: The halogenated masterbatch, polypropylene granules, and additives are added to a mixer and stirred until uniformly mixed to obtain a spinning mixture; C) Extrusion melting; D) Spinning; E) Post-treatment and web formation; F) Winding and finishing to obtain the finished nonwoven fabric. Products made from the antibacterial nonwoven fabric of this invention have good antibacterial and sterilization effects and are safe and environmentally friendly.

Description

Technical Field

[0001] This invention belongs to the field of antibacterial materials technology, and particularly relates to non-woven antibacterial materials. Background Technology

[0002] Face masks have become essential items for blocking particulate dust and bacteria, protecting vulnerable populations, and providing effective personal protection. Most protective masks currently on the market use polypropylene meltblown nonwoven fabric as the filter layer, relying on blocking, electrostatic adsorption, and other mechanisms to block dust and bacteria, thus providing effective protection. However, according to relevant research, bacteria and viruses remaining in the mask's filter layer can continue to multiply and grow, causing secondary harm to the human body. To prevent these pathogens from causing further harm, it is necessary to develop a mask with antibacterial properties.

[0003] Considering factors such as feasibility for industrialization, environmental friendliness, and economic efficiency, polypropylene is the preferred raw material for masks. These masks, made from ultrafine polypropylene meltblown fabric, exhibit excellent filtration efficiency, but they cannot kill harmful microorganisms and viruses. The surface of polypropylene fibers lacks active groups, making it difficult to chemically attach antibacterial functional groups to achieve antibacterial properties. Current technologies rely on inorganic antibacterial agents through blending and spinning to achieve fiber antibacterial properties. However, inorganic antibacterial agent particles easily clog the spinneret orifices, causing fiber breakage and numerous production failures, making it unsuitable for industrial production. Therefore, antibacterial masks produced using this method are rarely seen on the market. Furthermore, because inorganic antibacterial agents have a slow sterilization rate, they are difficult to effectively and immediately kill intercepted harmful bacteria and viruses. Additionally, inorganic antibacterial agents are leaching agents; while killing bacteria, the released inorganic antibacterial agents can also be inhaled, posing a risk of negative health effects.

[0004] Therefore, researching and preparing safe and efficient materials suitable for making antibacterial masks is of great practical significance for protecting people's health. Summary of the Invention

[0005] To address the shortcomings of existing materials used in the manufacture of antibacterial functional masks, this invention proposes the following technical solution:

[0006] A method for preparing a nonwoven material with antibacterial function from polymer granules containing amide derivative monomers, comprising the following steps:

[0007] A. Preparation of masterbatch:

[0008] A.1, Mixing:

[0009] In a mixer, polypropylene granules and acrylamide derivative monomers are added sequentially and stirred until homogeneous to obtain a masterbatch mixture. The amount of acrylamide derivative monomers added is 0.3% to 7.5% of the mass fraction of the polypropylene granules. The acrylamide derivative monomers are selected from one or a mixture of two or more of N-methylacrylamide, N-ethylacrylamide, N-n-propylacrylamide, N-isopropylacrylamide, N-hydroxymethylacrylamide, N-hydroxyethylacrylamide, N-(2-hydroxypropyl)acrylamide, acrylamide, N-methylmethylacrylamide, N-ethylmethylacrylamide, N-hydroxyethylmethylacrylamide, N-n-propylmethylacrylamide, N-isopropylmethylacrylamide, N-hydroxymethylmethylacrylamide, and N-(2-hydroxypropyl)methylacrylamide.

[0010] A.2 Irradiation:

[0011] Masterbatch irradiated material is obtained by irradiating the masterbatch mixture with an electron beam accelerator in a low-oxygen atmosphere.

[0012] A.3 Extraction:

[0013] The irradiated masterbatch and entrainer are placed together in the extraction vessel of a supercritical extraction device and extracted with CO2 under supercritical conditions to dissolve the unreacted monomers. The unreacted residual monomers are then separated in a separation vessel to remove them, yielding the masterbatch extract. The entrainer is a solvent with good compatibility with the residual monomers, selected from one or a mixture of ethanol and methanol. The amount of entrainer used is 5.0% to 40.0% of the mass fraction of CO2.

[0014] A.4, Halogenation:

[0015] The masterbatch extract is immersed in a hypohalite aqueous solution with a pH of 6.5–7.5 and a mass percentage concentration of 0.1–10.0%, and halogenated at room temperature for 30–80 minutes. After halogenation, the extract is removed, dehydrated, and dried at 40–70°C to obtain a masterbatch halogenated material containing N-halamide polymer.

[0016] B. Mixing:

[0017] The masterbatch halogenated feedstock, polypropylene granules, and additives are added to a mixer and stirred until homogeneous to obtain a spinning mixture. The masterbatch halogenated feedstock and polypropylene granules are mixed in a mass ratio of 30:70 to 50:50, and the amount of additives added is 0.0% to 5.0% of the mass fraction of the mixture.

[0018] C. Extrusion melting:

[0019] The spinning mixture is fed into a screw extruder and continues to be mixed, heated, and extruded in the extruder until it changes from a solid state to a molten state.

[0020] D. Spinning:

[0021] Then, the molten spinning mixture is filtered and pumped to the spinneret, where it enters the spinneret head for spinning.

[0022] E. Post-processing and web formation:

[0023] The fine filaments extruded by the spinneret flow through the drawn filaments and then pass through the meltblown nonwoven fabric process to turn the fiber web into nonwoven fabric.

[0024] F. Winding and Finishing

[0025] The prepared nonwoven fabric is wound into a cloth, then cut, sorted, and finished before being wound again to obtain the finished nonwoven fabric.

[0026] Preferably, the amount of acrylamide derivative monomer added is 3% to 5% of the mass fraction of polypropylene granules.

[0027] Preferably, the entrainer in step A.3 is ethanol.

[0028] Preferably, the amount of additive added in step B is 0.01% to 2.0%. The additive is an additive that makes the process smoother and the product performance better, including dispersants, solvents, reinforcing agents, color masterbatches, etc., selected from one or a mixture of two or more of them.

[0029] Alternatively, in step A.1, after adding polypropylene granules and acrylamide derivative monomers to the mixer, a solvent monomer is also added. The amount of solvent monomer added is 10-50% of the mass fraction of the comonomer, and preferably 20-30% of the mass fraction of the comonomer.

[0030] Specifically, the solvent monomer is a lipophilic monomer that is liquid at room temperature, selected from one or more of styrene, butyl acrylate, amyl acrylate, hexyl acrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, vinyl ether, methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, vinyl acetate, dimethyl maleate, vinylene carbonate, n-propyl vinyl ether, isopropyl vinyl ether, vinyl n-butyl ether, and isobutyl vinyl ether, preferably styrene, butyl acrylate, and amyl acrylate.

[0031] Specifically, the electron beam accelerator is a high-energy electron beam accelerator, including a high-voltage accelerator, an induction accelerator, and a resonant accelerator.

[0032] Specifically, the irradiation treatment refers to irradiating the masterbatch material with an electron beam accelerator at a dose of 10-150 kGy, preferably 20-60 kGy, and more preferably 20-40 kGy.

[0033] Specifically, the hypohalite is selected from one of sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, sodium hypobromite, potassium hypobromite, and calcium hypobromite, with sodium hypochlorite and calcium hypochlorite being preferred.

[0034] As a preferred embodiment, without compromising the effectiveness of the present invention, in order to facilitate the halogenation reaction, in step A.4 halogenation, an interfacial compatibilizer may be added to the hypohalite aqueous solution, the amount of which is 1 to 10% of the mass percentage of the hypohalite aqueous solution, preferably 1 to 5%.

[0035] The interface compatibilizer refers to the physical and chemical compatibility between a solid and a liquid phase when they come into contact to form an interface. It includes methanol, ethanol, propanol, isopropanol, butanol, phenol, ethyl acetate, tetrahydrofuran, methyl ethyl ketone, etc., selected from one or a mixture of two or more of them, with ethanol and propanol being preferred.

[0036] The second objective of this invention is to provide nonwoven fabrics and nonwoven fabric products with antibacterial function. In order to achieve the above objective, this invention uses any of the nonwoven fabrics described above to make masks.

[0037] Besides face masks, the materials of this invention can also be made into filter materials, wet wipes, soft towel rolls, face masks, beauty products, floss, etc.

[0038] This invention relates to an antibacterial nonwoven fabric. When a slightly highly polar N-haloamide polymer and a low-polar polyolefin matrix material are melt-blended and spun, more N-haloamide polymer is enriched on the surface of the fibers due to the migration effect. When the fibers come into contact with bacteria, the oxidized halogens in the structure are released, which destroy the bacterial cell membrane and oxidize the protein structure in the bacterial cells, thereby inhibiting bacterial reproduction or inactivating bacteria and playing a bactericidal role. It has the characteristics of strong stability, broad-spectrum bactericidal efficiency, and low toxicity.

[0039] High-energy radiation is a uniform, efficient, and easily controllable initiation method. High-energy rays can be used for grafting onto the surface of solid organic materials and for the polymerization and curing of monomers. Compared with other chemical methods, it has a significant competitive advantage in terms of cost. Therefore, in this invention, high-energy radiation was chosen as the polymerization method for acrylamide derivative monomers during the preparation of the masterbatch. Since the high-energy electron beam generated by an electron accelerator has a high irradiation intensity, a high-energy electron beam accelerator is preferred as the radiation source for the radiation generator.

[0040] The irradiated masterbatch is extracted with supercritical CO2 fluid and unreacted residual monomers are separated and removed to achieve a safer and more hygienic use.

[0041] The raw materials selected in this invention are inexpensive and readily available, resulting in low production costs. A haloamine compound is mixed into a polypropylene matrix via radiation to form a blended filament and nonwoven fabric, which is then used to manufacture masks. These masks, with their antibacterial properties, utilize the nonwoven fabric as a carrier for the antibacterial compounds, including those with antibacterial and sterilizing functions. When people use the mask to achieve antibacterial and sterilizing effects, the antibacterial agent will not be released into the environment in small molecules, preventing secondary pollution. This achieves a safe and environmentally friendly antibacterial effect.

[0042] Products made from the antibacterial nonwoven fabric of this invention include masks, filter materials, wet wipes, soft towel rolls, facial masks, beauty products, and wadding. Detailed Implementation

[0043] The present invention will be further illustrated by the following embodiments, but the embodiments do not limit the scope of the present invention.

[0044] Example 1

[0045] This example illustrates a method for preparing a nonwoven material with antibacterial properties, which includes the following steps:

[0046] A. Preparation of masterbatch:

[0047] A.1, Mixing:

[0048] 1.0M equipped with a stirring device 3 In a mixer, 300 kg of polypropylene granules with a melt index of 1300 g / 10 min, 10 kg of N-ethylacrylamide, and 2 kg of hexyl acrylate are added sequentially. After stirring for 20-30 min and mixing evenly, a masterbatch mixture is obtained.

[0049] A.2 Irradiation:

[0050] Next, the above masterbatch mixture was packaged into 30cm*40cm pressure-resistant plastic bags with sealing function, and vacuumed to a relative pressure of -0.07 to -0.08MPa. Then, 0.05MPa industrial nitrogen gas was injected, and the vacuum process was repeated 5 times before sealing. The bags were then flattened and placed on the conveyor belt of a 5Mev high-energy electron beam accelerator irradiation device for irradiation at a dose of 30kGy to obtain the irradiated masterbatch.

[0051] A.3 Extraction:

[0052] Then, the irradiated masterbatch and 20 kg of ethanol were placed together in a 0.5 M solution. 3In the extraction vessel, after sealing and filling with liquid CO2, the process is adjusted to carry out extraction under supercritical conditions of 39℃ and 8.5 MPa to dissolve unreacted monomers. After extraction for 40 minutes, the pressure is released, and the unreacted residual monomers are separated and removed to obtain the masterbatch extract.

[0053] The supercritical extraction device is a device that uses supercritical fluid extraction technology to perform extraction operations, thereby extracting and separating residual unpolymerized monomers from irradiated solid irradiated materials. The main equipment in the process consists of a high-pressure extraction vessel, a separation vessel, a heat exchanger, a high-pressure pump (compressor), a storage tank, and pipes, valves, and joints connecting these devices. The extraction time is 0.5 to 1.0 hours.

[0054] A.4, Halogenation:

[0055] The sodium hypochlorite mass percentage concentration is adjusted to 2.0% with water, the pH is adjusted to 7-7.5 with dilute hydrochloric acid, and then ethanol is added and mixed evenly to obtain a halogenated solution. The amount of ethanol added is 1.5% of the mass of the sodium hypochlorite aqueous solution.

[0056] The extracted masterbatch material after extraction treatment is then immersed in the above-mentioned halogenation solution and halogenated at room temperature for 50 minutes. It is then removed, dehydrated, and dried at 60-65°C to obtain the halogenated masterbatch material.

[0057] B. Mixing:

[0058] The above-mentioned masterbatch halogenated material and polypropylene granules with a melt index of 1300 g / 10 min are added to the mixing hopper in a ratio of 45:55. After stirring and mixing evenly in the mixing hopper, a spinning mixture is obtained.

[0059] C. Extrusion melting:

[0060] Next, the above spinning mixture is fed into a screw extruder, the temperature of the screw extruder is adjusted to 230-245°C, and the mixture is continued to be mixed and extruded in the extruder until they change from a solid state to a molten state.

[0061] D. Spinning:

[0062] Then, the melt after extrusion and melting is filtered by the filter assembly, and the pressure of the melt is controlled at 6-7 MPa. It is then pumped to the spinneret by a metering pump and enters the spinneret for spinning.

[0063] E. Post-processing and web formation

[0064] High-speed hot air is used to stretch the polymer melt stream extruded from the spinneret of a die, thereby forming ultrafine fibers that aggregate on a wire mesh screen or roller and bond together to form 25g / m² fibers. 2 Nonwoven fabric.

[0065] F. Winding and Finishing

[0066] Finally, the 25g / m 2 Nonwoven fabric is wound into a cloth and then recut into finished meltblown nonwoven fabrics with a width of 70cm to 180cm and a winding diameter of 600 to 800mm as required.

[0067] Example 2

[0068] This example is another embodiment of a method for preparing a nonwoven material with antibacterial function, which includes the following steps:

[0069] A. Preparation of masterbatch:

[0070] A.1, Mixing:

[0071] Equipped with a 1.0M stirring device 3 In a mixer, 300 kg of polypropylene granules with a melt index of 1300 g / 10 min, 6.0 kg of N-ethylacrylamide, 5.0 kg of N-n-propylacrylamide, and 1 kg of propyl methacrylate are added sequentially. After stirring for 25-30 min and mixing evenly, a masterbatch mixture is obtained.

[0072] A.2 Irradiation:

[0073] Next, the above masterbatch mixture was packaged into 40cm*40cm pressure-resistant plastic bags with sealing function, and vacuumed to a relative pressure of -0.075 to -0.085MPa. Then, 0.012MPa industrial nitrogen gas was injected, and the vacuum process was repeated four times before sealing. The bags were then flattened and placed on the conveyor belt of a 5Mev high-energy electron beam accelerator irradiation device for irradiation at a dose of 25kGy to obtain the irradiated masterbatch.

[0074] A.3 Extraction:

[0075] Then, the irradiated masterbatch and 30 kg of ethanol were placed together in a 0.5 M immersion tank. 3 In the extraction vessel, after sealing and filling with liquid CO2, the process is adjusted to carry out extraction under supercritical conditions of 40℃ and 8.6Mpa, dissolving unreacted monomers. After extraction for 40 minutes, the pressure is released, and the unreacted residual monomers are separated and removed to obtain the masterbatch extract.

[0076] A.4, Halogenation:

[0077] After adjusting the pH of the sodium hypochlorite aqueous solution to 7.3 with dilute hydrochloric acid, the mass percentage concentration of sodium hypochlorite was adjusted to 2.2% with water, and then ethanol was added and mixed evenly to obtain a halogenated solution. The amount of ethanol added was 1.5% of the mass of the sodium hypochlorite aqueous solution.

[0078] The extracted masterbatch material is then immersed in the above-mentioned halogenation solution and subjected to halogenation reaction at room temperature for 60 minutes. It is then removed, dehydrated, and dried at 60-63°C to obtain halogenated material containing masterbatch.

[0079] B. Mixing:

[0080] The above-mentioned masterbatch halogenated material, polypropylene granules with a melt index of 1300 g / 10 min, and yellow masterbatch with a melt index of 1300 g / 10 min are added to the mixing hopper in a ratio of 32:65:3. After stirring and mixing evenly in the mixing hopper, a spinning mixture is obtained.

[0081] C. Extrusion melting:

[0082] Next, the above spinning mixture is fed into a screw extruder, the temperature of the screw extruder is adjusted to 230-240°C, and the mixture is continued to be mixed and extruded in the extruder until they change from a solid state to a molten state.

[0083] D. Spinning:

[0084] Then, the melt after extrusion and melting is filtered by the filter assembly, and the pressure of the melt is controlled at 6.5-7 MPa. It is then pumped to the spinneret by a metering pump and enters the spinneret for spinning.

[0085] E. Post-processing and web formation

[0086] High-speed hot air is used to stretch the polymer melt stream extruded from the spinneret of a die, thereby forming ultrafine fibers that aggregate on a wire mesh screen or roller and bond together to form 25g / m² fibers. 2 Nonwoven fabric.

[0087] F. Winding and Finishing

[0088] Finally, the 25g / m 2 Nonwoven fabric is wound into a cloth and then recut into finished meltblown nonwoven fabrics with a width of 70cm to 180cm and a winding diameter of 600 to 800mm as required.

[0089] Example 3

[0090] This example illustrates a method for preparing an antibacterial meltblown nonwoven fabric, which includes the following steps:

[0091] A. Preparation of masterbatch:

[0092] A.1, Mixing:

[0093] In a 1.0M container with a stirrer 3In a mixer, 300 kg of polypropylene granules with a melt index of 1300 g / 10 min, 2 kg of N-ethylacrylamide, 5 kg of N-(2-hydroxypropyl)acrylamide, and 5 kg of N-isopropylacrylamide are added sequentially. After stirring for 25-30 min and mixing evenly, a masterbatch mixture is obtained.

[0094] A.2 Irradiation:

[0095] Next, the above masterbatch mixture was packaged into 30cm*40cm pressure-resistant plastic bags with sealing function, and vacuumed to a relative pressure of -0.07 to -0.08MPa. Then, 0.05MPa industrial nitrogen gas was injected, and the vacuum process was repeated 5 times before sealing. The bags were then flattened and placed on the conveyor belt of a 5Mev high-energy electron beam accelerator irradiation device for irradiation at a dose of 30kGy to obtain the irradiated masterbatch.

[0096] A.3 Extraction:

[0097] Then, the irradiated masterbatch and 17 kg of ethanol were placed together in a 0.5 M immersion tank. 3 In the extraction vessel, after sealing and filling with liquid CO2, the process is adjusted to carry out extraction under supercritical conditions of 35℃ and 8.5 MPa to dissolve unreacted monomers. After extraction for 45 minutes, the pressure is released, and the unreacted residual monomers are separated and removed to obtain the masterbatch extract.

[0098] A.4, Halogenation:

[0099] The sodium hypochlorite mass percentage concentration is adjusted to 1.5% with water, the pH is adjusted to 7-7.5 with dilute hydrochloric acid, and then ethanol is added and mixed evenly to obtain a halogenated solution. The amount of ethanol added is 1.5% of the mass of the sodium hypochlorite aqueous solution.

[0100] The extracted masterbatch material after extraction treatment is then immersed in the above-mentioned halogenation solution and halogenated at room temperature for 50 minutes. It is then removed, dehydrated, and dried at 60-65°C to obtain the halogenated masterbatch material.

[0101] B. Mixing:

[0102] The above-mentioned masterbatch halogenated material and polypropylene granules with a melt index of 1200 g / 10 min are added to the mixing hopper at a ratio of 30:70. After stirring and mixing evenly in the mixing hopper, a spinning mixture is obtained.

[0103] C. Extrusion melting:

[0104] Next, the above spinning mixture is fed into a screw extruder, the temperature of the screw extruder is adjusted to 230-245°C, and the mixture is continued to be mixed and extruded in the extruder until they change from a solid state to a molten state.

[0105] D. Spinning:

[0106] Then, the melt after extrusion and melting is filtered by the filter assembly, and the pressure of the melt is controlled at 6-7 MPa. It is then pumped to the spinneret by a metering pump and enters the spinneret for spinning.

[0107] E. Post-processing and web formation

[0108] High-speed hot air is used to stretch the polymer melt stream extruded from the spinneret of a die, thereby forming ultrafine fibers that condense on a wire mesh screen or roller and bond together to form 28g / m² fibers. 2 Nonwoven fabric.

[0109] F. Winding and Finishing

[0110] Finally, the 25g / m 2 Nonwoven fabric is wound into a cloth and then recut into finished meltblown nonwoven fabrics with a width of 70cm to 180cm and a winding diameter of 600 to 800mm as required.

[0111] Example 4

[0112] This example is a test embodiment of the antibacterial performance of the nonwoven fabric with antibacterial function of the present invention.

[0113] The antibacterial properties of the nonwoven fabric were tested according to the test method for antibacterial knitted fabrics in the People's Republic of China textile industry standard FZ / T 73023-2006. The antibacterial performance is shown in Table 1.

[0114] Table 1

[0115]

[0116] Example 5

[0117] This example illustrates a method for preparing an antibacterial face mask.

[0118] The antibacterial nonwoven fabric prepared in Example 1 is used as the middle layer to make a mask with antibacterial function.

[0119] Example 6

[0120] This example illustrates a method for preparing an antibacterial face mask.

[0121] Using the antibacterial nonwoven fabric prepared in Example 2, two layers are combined as the middle layer; plus the inner and outer layers of spunbond fabric, a total of four layers are made to create a mask with antibacterial function.

[0122] Example 7

[0123] This example illustrates a method for preparing an antibacterial filter cloth.

[0124] The antibacterial nonwoven fabric prepared in Example 3 was used as a filter cloth to create an air filter with antibacterial function.

[0125] Example 8

[0126] This example illustrates a method for preparing an antibacterial facial mask.

[0127] The antibacterial nonwoven fabric prepared in Example 2 was used to make a face mask with antibacterial function that absorbs nutrient solution.

[0128] Example 9

[0129] This example demonstrates a method for preparing antibacterial wet wipes.

[0130] The antibacterial nonwoven fabric prepared in Example 3 was used to make a wet wipe with antibacterial function.

Claims

1. A method for preparing a nonwoven material with antibacterial function from polymer raw materials containing amide derivative monomers, characterized in that... Includes the following steps: A. Preparation of masterbatch: A.1, Mixing: In a mixer, polypropylene granules and acrylamide derivative monomers are added sequentially and stirred until homogeneous to obtain a masterbatch mixture. The amount of acrylamide derivative monomers added is 0.3% to 7.5% of the mass fraction of the polypropylene granules. The acrylamide derivative monomers are selected from one or more of N-methylacrylamide, N-ethylacrylamide, N-n-propylacrylamide, N-isopropylacrylamide, N-hydroxymethylacrylamide, N-hydroxyethylacrylamide, N-(2-hydroxypropyl)acrylamide, acrylamide, N-methylmethylacrylamide, N-ethylmethylacrylamide, N-hydroxyethylmethylacrylamide, N-n-propylmethylacrylamide, N-isopropylmethylacrylamide, N-hydroxymethylmethylacrylamide, and N-(2-hydroxypropyl)methylacrylamide. A.2 Irradiation: Masterbatch irradiated material is obtained by irradiating the masterbatch mixture with an electron beam accelerator in a low-oxygen atmosphere. A.3 Extraction: The irradiated masterbatch and entrainer are placed together in the extraction vessel of a supercritical extraction device and extracted with CO2 under supercritical conditions to dissolve unreacted monomers. The unreacted residual monomers are then separated in a separation vessel to remove them, yielding the masterbatch extract. The entrainer is a solvent with good compatibility with the residual monomers, selected from one or a mixture of ethanol and methanol. The amount of entrainer used is 5.0% to 40.0% of the CO2 mass fraction. A.4, Halogenation: The masterbatch extract is immersed in a hypohalite aqueous solution with a pH of 6.5-7.5 and a mass percentage concentration of 0.1-10.0%, and halogenated at room temperature for 30-80 minutes. After halogenation, the extract is removed, dehydrated, and dried at 40-70°C to obtain a masterbatch halogenated material containing N-halamide polymer. B. Mixing: The masterbatch halogenated feedstock, polypropylene granules, and additives are added to a mixer and stirred until homogeneous to obtain a spinning mixture. The masterbatch halogenated feedstock and polypropylene granules are mixed in a mass ratio of 30:70 to 50:50, and the amount of additives added is 0.0% to 5.0% of the mass fraction of the mixture. C. Extrusion melting: The spinning mixture is fed into a screw extruder and continues to be mixed, heated, and extruded in the extruder until it changes from a solid state to a molten state. D. Spinning: The molten spinning mixture is filtered and then pumped to the spinneret, where it enters the spinneret head for spinning. E. Post-processing and web formation: The fine filaments extruded by the spinneret flow through the drawn filaments and then pass through the meltblown nonwoven fabric process to turn the fiber web into nonwoven fabric. F. Winding and Finishing The prepared nonwoven fabric is wound into a cloth, then cut, sorted, and finished before being wound again to obtain the finished nonwoven fabric.

2. The preparation method according to claim 1, characterized in that: In step A.1, after adding polypropylene granules and acrylamide derivative monomers to the mixer, a copolymer monomer is also added. The amount of copolymer monomer added is 10-50% of the mass fraction of the comonomer. The copolymer monomer is selected from one or more of the following: styrene, butyl acrylate, amyl acrylate, hexyl acrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, vinyl ether, methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, vinyl acetate, dimethyl maleate, vinylene carbonate, n-propyl vinyl ether, isopropyl vinyl ether, vinyl n-butyl ether, and isobutyl vinyl ether.

3. The preparation method according to claim 1, characterized in that: The amount of acrylamide derivative monomer added is 3% to 5% of the mass fraction of polypropylene granules, and the amount of solvent monomer added is 20% to 30% of the mass fraction of comonomer.

4. The preparation method according to claim 1, characterized in that: The amount of additive added in step B is 0.01%~2.0%.

5. The preparation method according to claim 1, characterized in that: The electron beam accelerator is a high-energy electron beam accelerator, including a high-voltage accelerator, an induction accelerator, and a resonant accelerator.

6. The preparation method according to claim 1, characterized in that: The irradiation treatment refers to irradiating the masterbatch material with an electron beam accelerator at a dose of 10~150kGy.

7. The preparation method according to claim 1, characterized in that: The hypohalite is selected from one of sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, sodium hypobromite, potassium hypobromite, and calcium hypobromite.

8. The nonwoven fabric obtained by the method according to any one of claims 1 to 7.

9. A product made using the nonwoven fabric as described in claim 8.

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