Graphene-spun filament nonwoven fabric and method for manufacturing the same

Abstract

The application relates to the field of non-woven fabric manufacturing, and particularly discloses a graphene spunbond filament non-woven fabric and a preparation method thereof.A graphene spunbond filament non-woven fabric comprises the following raw materials in parts by weight: 90-110 parts of polypropylene, 0.5-1.5 parts of graphene, 1-3 parts of nano-silver, 0.5-1.5 parts of chlorine dioxide and 1-3 parts of sodium alginate.The graphene spunbond filament non-woven fabric has excellent antibacterial performance and antibacterial durability;the mutual combination of graphene, nano-silver and chlorine dioxide promotes the excellent antibacterial performance of the non-woven fabric;the sodium alginate is used to form a film to protect the antibacterial components of the non-woven fabric, thereby achieving a slow-release effect and improving the antibacterial durability of the non-woven fabric.

Description

Technical Field

[0001] This application relates to the field of nonwoven fabric manufacturing, and more specifically, to a graphene spunbond filament nonwoven fabric and a method for preparing the same. Background Technology

[0002] Spunbond nonwoven fabrics possess excellent resistance to high and low temperatures, aging resistance, and breathability, making them suitable for applications such as packaging fabrics and bag fabrics. Commonly used spunbond nonwoven fabrics include polypropylene spunbond nonwoven fabrics, which are made primarily from polypropylene through high-temperature spinning, carding, and bonding to form a fibrous web. These can be used in disposable masks, disposable medical protective clothing, diapers, etc., and spunbond nonwoven fabrics have consistently been the preferred material in the medical and health field.

[0003] However, most existing spunbond nonwoven fabrics only have the ability to adsorb bacteria and do not have antibacterial ability themselves. When spunbond nonwoven fabrics are used in medical and health products, the protective effect is very limited, thus affecting the application of spunbond nonwoven fabrics in the medical and health field. Summary of the Invention

[0004] To improve the antibacterial properties of spunbond nonwoven fabrics, this application provides a graphene spunbond filament nonwoven fabric and its preparation method.

[0005] In a first aspect, this application provides a graphene spunbond filament nonwoven fabric, which adopts the following technical solution:

[0006] A graphene spunbond filament nonwoven fabric comprises the following raw materials in parts by weight: 90-110 parts polypropylene, 0.5-1.5 parts graphene, 1-3 parts nano silver, 0.5-1.5 parts chlorine dioxide, and 1-3 parts sodium alginate.

[0007] By employing the above-mentioned technical solutions, graphene, with its large specific surface area and hydrophobicity, can adsorb and bind to phospholipid molecules on the surface of bacteria through contact and embedding, thereby disrupting the bacterial cell membrane structure and leading to bacterial death. This results in a bactericidal and antibacterial effect in spunbond nonwoven fabrics. Adding nano-silver to spunbond nonwoven fabrics allows silver ions to inactivate bacterial proteases and destroy cellular components upon contact with bacteria, thus causing cell death. Adding chlorine dioxide to the nonwoven fabrics improves their adsorption and permeability to bacterial cell walls, oxidizing and attacking intracellular sulfhydryl-containing enzymes, causing bacterial inactivation, and thus achieving antibacterial and bactericidal effects.

[0008] The carboxyl groups in sodium alginate can crosslink with nonwoven fabrics to form a dense interpenetrating network structure, which can improve the mechanical strength and abrasion resistance of spunbond nonwoven fabrics. On the other hand, sodium alginate can increase the viscosity between graphene, nano-silver, and chlorine dioxide on the surface of nonwoven fabrics, forming a continuous and transparent film on the surface of the nonwoven fabric. This can protect the antibacterial active components on the surface of the nonwoven fabric, achieve a slow-release effect, and improve the antibacterial durability of the nonwoven fabric.

[0009] Preferably, the nonwoven fabric raw material further includes 3-5 parts of 3-(isobutenoyl)propyltrimethoxyalkylene.

[0010] By adopting the above technical solution, 3-(isobutenoyl)propyltrimethoxyalkylene modifies the surface of nonwoven fabric, introducing polar groups such as hydroxyl groups into the surface of the nonwoven fabric. This allows graphene to react chemically with the polar groups on the surface of the nonwoven fabric, promoting the firm bonding of graphene to the surface of the nonwoven fabric. This improves the strength and antibacterial durability of the nonwoven fabric, enhances the bonding force between the components on the surface of the nonwoven fabric, increases the degree of cross-linking on the surface of the nonwoven fabric, reduces the tendency of the nonwoven fabric to tear, and improves the tear strength of the nonwoven fabric.

[0011] Preferably, the nonwoven fabric raw material further includes 2-4 parts of nano-silica.

[0012] By employing the above technical solution, nano-silica can encapsulate nano-silver, forming nano-silica microspheres. These microspheres are then modified with 3-(isobutyryl)propyltrimethoxyalkylene and grafted onto nonwoven fabric. The nano-silica encapsulates and protects the nano-silver, reducing its susceptibility to oxidation and thus improving the antibacterial properties of the nonwoven fabric. On the surface of the nonwoven fabric, the nano-silica microspheres slowly release the nano-silver, enhancing the fabric's antibacterial durability and further improving its antibacterial capabilities.

[0013] Preferably, the nonwoven fabric raw material further includes 2-5 parts of sodium carboxymethyl cellulose.

[0014] By adopting the above technical solution, the carboxymethyl group of sodium carboxymethyl cellulose has a certain steric hindrance effect, which can weaken the interaction forces between macromolecules of nonwoven fibers, reduce the size of the crystalline region of nonwoven fibers, and improve the flexibility of nonwoven fabrics. At the same time, the hydroxyl and carboxyl groups between sodium carboxymethyl cellulose and sodium alginate molecules can form a network crosslinking, and the macromolecular chains become entangled, thereby improving the breaking strength and elongation at break of nonwoven fabrics and reducing the tendency of spunbond nonwoven fabrics to crack.

[0015] Preferably, the nonwoven fabric raw material further includes 5-8 parts of chitosan quaternary ammonium salt.

[0016] By employing the above-mentioned technical solution, adding chitosan quaternary ammonium salt to the polypropylene system can affect the normal physiological functions of bacteria, thereby leading to the normal death of bacteria and microorganisms and improving the antibacterial properties of nonwoven fabrics. Simultaneously, under high-temperature conditions, chitosan quaternary ammonium salt can form strong covalent bonds with the nonwoven fabric, restricting the slippage between macromolecular chains in the amorphous regions of the nonwoven fabric, thus improving the wrinkle resistance and washability of the nonwoven fabric.

[0017] Preferably, the nano-silver particle size is 25nm-50nm.

[0018] By adopting the above technical solution and adding nano-silver of appropriate particle size to the polypropylene system, the nano-silver can be uniformly and stably dispersed in the nonwoven fabric system, thereby improving the antibacterial durability of the nonwoven fabric.

[0019] Secondly, this application provides a method for preparing graphene spunbond filament nonwoven fabric, using the following technical solution:

[0020] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0021] First, graphene and nano-silver are mixed at 80-90℃ to form a mixture. Then, polypropylene, chlorine dioxide and sodium alginate are added to the mixture and mixed. Finally, the mixture is melt-extruded and granulated at 140-160℃ to obtain polypropylene composite masterbatch.

[0022] Then, the polypropylene composite masterbatch is melt-spun to form polypropylene filaments, which are then drawn into a web and bonded together to finally produce graphene spunbond filament nonwoven fabric.

[0023] By adopting the above technical solution, the prepared spunbond nonwoven fabric has excellent antibacterial properties. At the same time, sodium alginate can also form a film to protect graphene, nano silver and chlorine dioxide, thereby improving the antibacterial durability of the spunbond nonwoven fabric.

[0024] Preferably, nano-silver and nano-silica are mixed in advance, dried, and then a nano-silver-silica composite is prepared. Then, the nano-silver-silica composite is mixed with 3-(isobutenoyl)propyltrimethoxyalkane, centrifuged, dried, and a modified nano-silver-silica composite is prepared.

[0025] By adopting the above technical solution, nano-silver and nano-silica are pre-formed into nano-silver-silica microspheres, which are then grafted onto nonwoven fabric using 3-(isobutenoyl)propyltrimethoxyalkylene, which promotes the slow release of nano-silver antibacterial components on the surface of the nonwoven fabric and improves the antibacterial durability of the nonwoven fabric.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. This application incorporates graphene, nano-silver, and chlorine dioxide into polypropylene nonwoven fabric, resulting in excellent antibacterial and bactericidal properties. Furthermore, sodium alginate is bonded to the surface of the nonwoven fabric to form a protective film around the graphene, nano-silver, and chlorine dioxide, thereby enhancing the antibacterial durability of the nonwoven fabric.

[0028] 2. In this application, 3-(isobutenoyl)propyltrimethoxyalkylene and nano-silica are preferably added to the nonwoven fabric system. The nano-silica encapsulates and protects the nano-silver, reducing the oxidation of the nano-silver and thus improving the antibacterial durability of the nonwoven fabric. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the embodiments.

[0030] In this specific embodiment, there are no other special circumstances, and the components used are as follows:

[0031] The polypropylene was purchased from Shanghai SECCO Petrochemical Co., Ltd. as S2040.

[0032] The particle size of nano-silica is 15nm-20nm.

[0033] Example

[0034] Example 1

[0035] A graphene spunbond filament nonwoven fabric comprises the following raw materials in parts by weight: 100 kg of polypropylene, 1 kg of graphene, 2 kg of nano silver, 1 kg of chlorine dioxide, and 2 kg of sodium alginate, wherein the nano silver has a particle size of 25 nm-30 nm.

[0036] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0037] S1: Graphene and nano-silver are mixed at 85°C and stirred at 800r / min for 20min to form a mixture. Polypropylene, chlorine dioxide and sodium alginate are then added to the mixture and stirred at 800r / min for 30min. The mixture is then melt-extruded and granulated at 160°C to obtain polypropylene composite masterbatch.

[0038] S2: The polypropylene composite masterbatch is melted at a spinning temperature of 160℃ and a spinning speed of 20 rpm, and then stretched and spun to form long polypropylene filaments. The long polypropylene filaments are then formed into a web under the traction of airflow at a temperature of 15℃ and a pressure of 1.2 kPa in a web forming machine to obtain a polypropylene web. After the polypropylene web is pre-bonded by a pre-compression roller, it is then bonded by a hot rolling mill at a temperature of 135℃ and a pressure of 50 N to finally obtain graphene spunbond filament nonwoven fabric.

[0039] Example 2-3

[0040] The difference between Examples 2-3 and Example 1 is that the content of each component in the nonwoven fabric raw material is different, as shown in Table 1.

[0041] Table 1: Content of each component in Examples 1-3

[0042]

[0043] Example 4

[0044] The difference between Example 4 and Example 1 is that the nonwoven fabric raw material also includes 4 kg of 3-(isobutenoyl)propyltrimethoxyalkylene.

[0045] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0046] S1: Graphene and nano-silver are mixed at 85°C and stirred at 800 r / min for 20 min to form a mixture. Then, polypropylene, 3-(isobutenoyl)propyltrimethoxyalkylene, chlorine dioxide and sodium alginate are added to the mixture and stirred at 800 r / min for 30 min. Finally, the mixture is melt-extruded and granulated at 160°C to obtain polypropylene composite masterbatch.

[0047] S2: The polypropylene composite masterbatch is melted at a spinning temperature of 160℃ and a spinning speed of 20 rpm, and then stretched and spun to form long polypropylene filaments. The long polypropylene filaments are then formed into a web under the traction of airflow at a temperature of 15℃ and a pressure of 1.2 kPa in a web forming machine to obtain a polypropylene web. After the polypropylene web is pre-bonded by a pre-compression roller, it is then bonded by a hot rolling mill at a temperature of 135℃ and a pressure of 50 N to finally obtain graphene spunbond filament nonwoven fabric.

[0048] Example 5

[0049] The difference between Example 5 and Example 4 is that the amount of 3-(isobutenoyl)propyltrimethoxyalkylene used in the nonwoven fabric raw material is 3 kg.

[0050] Example 6

[0051] The difference between Example 6 and Example 4 is that the amount of 3-(isobutenoyl)propyltrimethoxyalkylene used in the nonwoven fabric raw material is 5 kg.

[0052] Example 7

[0053] The difference between Example 7 and Example 4 is that the nonwoven fabric raw material also includes 3 kg of nano-silica.

[0054] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0055] S1: Nano-silver and toluene are mixed in advance, with a mass ratio of toluene to nano-silver of 1:4. The mixture is ultrasonically dispersed for 5 min. Then, nano-silica is slowly added while stirring at 300 r / min. The stirring is continued for 24 h. Then, the mixture is centrifuged at 1500 r / min for 2 min to form nano-silica microspheres. Finally, the microspheres are washed with distilled water and dried at 60 °C to form a nano-silica composite.

[0056] S2: The nano-silica complex was mixed with Tris-HCl buffer at pH 8.2 (mass ratio of Tris-HCl buffer to nano-silica complex was 500:1). 3-(isobutenoyl)propyltrimethoxyalkylene was slowly added while stirring at 300 r / min. The mixture was stirred at 800 r / min for 24 h, then washed with anhydrous ethanol, and then centrifuged at 1500 r / min for 2 min. The modified nano-silica microspheres were collected and dried at 60 °C to obtain the modified nano-silica complex.

[0057] S3: Graphene, polypropylene, modified nano-silver-silica composite, chlorine dioxide and sodium alginate are mixed and stirred at 800 r / min for 30 min. Then, the mixture is melt-extruded and granulated at 160℃ to obtain polypropylene composite masterbatch.

[0058] S4: The polypropylene composite masterbatch is melted at a spinning temperature of 160℃ and a spinning speed of 20 rpm, and then stretched and spun to form long polypropylene filaments. The long polypropylene filaments are then spun into a web under the traction of airflow at a temperature of 15℃ and a pressure of 1.2 kPa in a web forming machine to obtain a polypropylene web. After the polypropylene web is pre-bonded by a pre-compression roller, it is then bonded by a hot rolling mill at a temperature of 135℃ and a pressure of 50 N to finally obtain graphene spunbond filament nonwoven fabric.

[0059] Example 8

[0060] The difference between Example 8 and Example 7 is that the amount of nano-silica used in the nonwoven fabric raw material is 2 kg.

[0061] Example 9

[0062] The difference between Example 9 and Example 7 is that the amount of nano-silica used in the nonwoven fabric raw material is 4 kg.

[0063] Example 10

[0064] The difference between Example 10 and Example 7 is that the nonwoven fabric raw material also includes 3 kg of sodium carboxymethyl cellulose.

[0065] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0066] S1: Mix nano-silver with toluene in advance at a mass ratio of 1:4. Disperse the mixture by ultrasonication for 5 min. Then, slowly add nano-silica while stirring at 300 r / min. Continue stirring for 24 h. Then, centrifuge at 1500 r / min for 2 min to form nano-silica microspheres. Finally, wash with distilled water and dry at 60 °C to form a nano-silica composite.

[0067] S2: The nano-silica complex was mixed with Tris-HCl buffer at pH 8.2 at a mass ratio of 500:1. 3-(isobutenoyl)propyltrimethoxyalkylene was slowly added while stirring at 300 r / min. The mixture was stirred at 800 r / min for 24 h. The solid was collected, washed with anhydrous ethanol, and then centrifuged at 1500 r / min for 2 min. The modified nano-silica microspheres were collected and dried at 60 °C to obtain the modified nano-silica complex.

[0068] S3: Graphene, polypropylene, modified nano-silver-silica composite, sodium carboxymethyl cellulose, chlorine dioxide and sodium alginate are mixed and stirred at 800 r / min for 30 min. Then, the mixture is melt-extruded and granulated at 160℃ to obtain polypropylene composite masterbatch.

[0069] S4: The polypropylene composite masterbatch is melted at a spinning temperature of 160℃ and a spinning speed of 20 rpm, and then stretched and spun to form long polypropylene filaments. The long polypropylene filaments are then spun into a web under the traction of airflow at a temperature of 15℃ and a pressure of 1.2 kPa in a web forming machine to obtain a polypropylene web. After the polypropylene web is pre-bonded by a pre-compression roller, it is then bonded by a hot rolling mill at a temperature of 135℃ and a pressure of 50 N to finally obtain graphene spunbond filament nonwoven fabric.

[0070] Example 11

[0071] The difference between Example 11 and Example 10 is that the amount of sodium carboxymethyl cellulose used in the nonwoven fabric raw material is 2 kg.

[0072] Example 12

[0073] The difference between Example 12 and Example 10 is that the amount of sodium carboxymethyl cellulose used in the nonwoven fabric raw material is 5 kg.

[0074] Example 13

[0075] The difference between Example 13 and Example 10 is that the nonwoven fabric raw material also includes 7 kg of chitosan quaternary ammonium salt.

[0076] A method for preparing graphene spunbond filament nonwoven fabric includes the following specific steps:

[0077] S1: Mix nano-silver with toluene in advance at a mass ratio of 1:4. Disperse the mixture by ultrasonication for 5 min. Then, slowly add nano-silica while stirring at 300 r / min. Continue stirring for 24 h. Then, centrifuge at 1500 r / min for 2 min to form nano-silica microspheres. Finally, wash with distilled water and dry at 60 °C to form a nano-silica composite.

[0078] S2: The nano-silica complex was mixed with Tris-HCl buffer at pH 8.2 (mass ratio of Tris-HCl buffer to nano-silica complex was 500:1). 3-(isobutenoyl)propyltrimethoxyalkylene was slowly added while stirring at 300 r / min. The mixture was stirred at 800 r / min for 24 h, then washed with anhydrous ethanol, and then centrifuged at 1500 r / min for 2 min. The modified nano-silica microspheres were collected and dried at 60 °C to obtain the modified nano-silica complex.

[0079] S3: Graphene, polypropylene, modified nano-silver-silica composite, sodium carboxymethyl cellulose, chlorine dioxide and sodium alginate are mixed and stirred at 800 r / min for 30 min. Then, the mixture is melt-extruded and granulated at 160℃ to obtain polypropylene composite masterbatch.

[0080] S4: The polypropylene composite masterbatch is melted at a spinning temperature of 160℃ and a spinning speed of 20 rpm, and then stretched and spun to form long polypropylene filaments. The long polypropylene filaments are then formed into a web under the traction of airflow at a temperature of 15℃ and a pressure of 1.2 kPa in a web forming machine to obtain a polypropylene web. After the polypropylene web is pre-bonded by a pre-compression roller, it is then bonded by a hot rolling mill at a temperature of 135℃ and a pressure of 50 N to form a nonwoven fabric.

[0081] S5: Then, chitosan quaternary ammonium salt is dissolved in sodium bicarbonate at a mass ratio of 1:1 to form a chitosan quaternary ammonium salt solution. The nonwoven fabric is then soaked in the chitosan quaternary ammonium salt solution at a bath ratio of 1:50, immersed at 60°C for 1 hour, pre-dried at 80°C for 5 minutes, and finally baked at 160°C for 3 minutes. It is then washed with deionized water and dried at 80°C to obtain graphene spunbond filament nonwoven fabric.

[0082] Example 14

[0083] The difference between Example 14 and Example 13 is that the amount of chitosan quaternary ammonium salt used in the nonwoven fabric raw material is 5 kg.

[0084] Example 15

[0085] The difference between Example 15 and Example 13 is that the amount of chitosan quaternary ammonium salt used in the nonwoven fabric raw material is 8 kg.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] The difference between Comparative Example 1 and Example 1 is that sodium alginate is not used in the nonwoven fabric raw material.

[0089] Performance testing

[0090] The graphene spunbond filament nonwoven fabrics provided in Examples 1-15 and Comparative Example 1 of this application were subjected to the following performance tests, and the specific test results are shown in Table 2.

[0091] Detection methods

[0092] I. Antibacterial properties

[0093] Referring to the standard of AATCC100-2012 "Evaluation Method for Antimicrobial Textiles", the antimicrobial rate was calculated using the shaking flask method. The test strains were a mixture of Gram-positive Staphylococcus aureus (ATCC6538) and Gram-negative Escherichia coli (ATCC8099). The antimicrobial properties of the nonwoven fabric and its antimicrobial effect after 30 and 60 washes were tested.

[0094] II. Fracture Strength

[0095] The tensile strength of nonwoven fabrics was tested in accordance with GB / T24218.3-2010 "Textiles - Test methods - Part 3: Determination of breaking strength and elongation at break (strip method)".

[0096] III. Anti-wrinkle properties

[0097] Referring to AATCC 66-2008 "Determination of Fabric Wrinkle Recovery", the elastic wrinkle recovery angle of the nonwoven fabric of this application was determined using a wrinkle recovery angle tester.

[0098] Table 2: Performance Test Data Table

[0099]

[0100]

[0101] As shown in the performance test data table, the graphene spunbond filament nonwoven fabric prepared in this application exhibits excellent antibacterial properties, with an antibacterial rate of 99%, thereby improving the protective effect of spunbond nonwoven fabric in disposable medical and hygiene products. In Examples 1-3, different amounts of graphene, nano-silver, and chlorine dioxide are used in this application to combine and promote the nonwoven fabric's excellent antibacterial properties. Simultaneously, sodium alginate is used to form a protective film on the nonwoven fabric, allowing the antibacterial components to be slowly released from the surface of the nonwoven fabric, thus improving the antibacterial durability of the nonwoven fabric. In contrast, Comparative Example 1, which does not use sodium alginate, shows a significant decrease in the antibacterial durability of the nonwoven fabric, as indicated by the performance test results, further demonstrating the promoting effect of sodium alginate on the antibacterial durability of the nonwoven fabric.

[0102] In Examples 4-6, 3-(isobutenoyl)propyltrimethoxyalkylene was added to this application. As can be seen from the performance test results, the tear strength of the nonwoven fabric was significantly improved. This further illustrates that the addition of 3-(isobutenoyl)propyltrimethoxyalkylene can promote the crosslinking degree of each component in the polypropylene system, strengthen the interaction force between each component in the polypropylene system, and thus improve the tear strength of the nonwoven fabric.

[0103] In Examples 7-9, nano-silica was added to the polypropylene system. The performance test results showed that the antibacterial durability of the nonwoven fabric was improved, further demonstrating the protective effect of silica on nano-silver. It can protect nano-silver. At the same time, the combination of 3-(isobutenoyl)propyltrimethoxyalkylene and nano-silica can promote better bonding between nano-silica and nonwoven fabric, and can also improve the tear strength and strength of nonwoven fabric.

[0104] In Examples 10-12, sodium carboxymethyl cellulose was added to the polypropylene system. The performance test results showed that the tear strength of the nonwoven fabric was significantly improved. This further illustrates that the network crosslinking formed by sodium carboxymethyl cellulose and the components of the polypropylene system improves the degree of crosslinking of the polypropylene system, thereby improving the tensile strength of the nonwoven fabric.

[0105] In Examples 13-15, chitosan quaternary ammonium salt was added to the polypropylene system. The performance test results showed that the nonwoven fabric had excellent wrinkle resistance. This further illustrates that the covalent bond between the chitosan quaternary ammonium salt and the nonwoven fabric reduces the slippage between molecules, thereby improving the wrinkle resistance and wash resistance of the nonwoven fabric.

[0106] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A graphene spunbond filament nonwoven fabric, characterized in that, The raw materials include the following parts by weight: 90-110 parts polypropylene, 0.5-1.5 parts graphene, 1-3 parts nano silver, 0.5-1.5 parts chlorine dioxide, 1-3 parts sodium alginate, 3-5 parts 3-(isobutenoyl)propyltrimethoxyalkylene, 2-4 parts nano silica, 2-5 parts sodium carboxymethyl cellulose, and 5-8 parts chitosan quaternary ammonium salt.

2. The graphene spunbond filament nonwoven fabric according to claim 1, characterized in that: The nano-silver particles have a diameter of 25nm-50nm.

3. A method for preparing graphene spunbond filament nonwoven fabric as described in any one of claims 1-2, characterized in that: The specific steps include the following: First, graphene and nano-silver are mixed at 80-90℃ to form a mixture. Then, polypropylene, chlorine dioxide and sodium alginate are added to the mixture. Finally, the mixture is melt-extruded and granulated at 140-160℃ to obtain polypropylene composite masterbatch. Then, the polypropylene composite masterbatch is melt-spun to form polypropylene filaments, which are then drawn into a web and bonded together to finally produce graphene spunbond filament nonwoven fabric.

4. The method for preparing graphene spunbond filament nonwoven fabric according to claim 3, characterized in that: The specific steps include: mixing nano-silver and nano-silica in advance, drying to obtain a nano-silver-silica composite, then mixing the nano-silver-silica composite with 3-(isobutenoyl)propyltrimethoxyalkane, centrifuging, drying to obtain a modified nano-silver-silica composite.

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