Antibacterial non-woven fabric and preparation process thereof

Abstract

The invention discloses an antibacterial non-woven fabric and a preparation process thereof, and belongs to the technical field of non-woven fabrics. Comprising the following raw materials in parts by weight: 60-70 parts of polypropylene resin, 10-20 parts of modified bamboo fibers, 5-8 parts of chitosan and 0.5-1.5 parts of an antioxidant. The chitosan and the bamboo fiber have certain antibacterial property, so that the antibacterial property of the non-woven fabric is improved; by modifying the bamboo fibers, the antibacterial performance of the non-woven fabric is remarkably improved, the compatibility of the bamboo fibers and a matrix is improved, meanwhile, micromolecular organic chains are grafted to the bamboo fibers, the migration resistance and seepage resistance of antibacterial components are remarkably improved, and the problems that according to a traditional coating method, falling is prone to occurring, and washing is not durable are solved; the bamboo fiber and the chitosan in the raw materials are natural and renewable materials and are environmentally friendly; in conclusion, the prepared non-woven fabric has stable and efficient antibacterial property, is environmentally friendly and has important application value in the technical field of non-woven fabrics.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of non-woven fabrics, and particularly relates to an antibacterial non-woven fabric and a preparation process thereof. BACKGROUND

[0002] With the significant enhancement of public health awareness and the increasing demand for health and safety, the research and application of antibacterial materials have become the focus of attention in many fields such as textiles, medical care and personal care. As a kind of fabric without traditional spinning and weaving process, non-woven fabric has the characteristics of one-time use, low cost and easy processing, and is widely used in sanitary products, medical dressings, protective clothing and household products. However, it usually does not have the function of inhibiting or eliminating microorganisms. In daily use environment, these materials are easy to become the medium for the breeding and spread of bacteria, fungi and other microorganisms. The attachment and reproduction of microorganisms on the surface of the fiber not only cause the product to produce bad odor, color spots and physical properties to accelerate degradation, shorten the service life, but also more seriously, they may constitute a potential source of biological pollution, directly threatening the health and safety of users, especially in hospitals, nursing homes and other places where susceptible populations are concentrated, the risk of cross infection is particularly prominent.

[0003] In the early days, in order to give non-woven fabric antibacterial properties, the common method is to build an antibacterial coating on its surface. The specific operation is to immerse the non-woven fabric to be treated in an antibacterial agent, and then carry out drying, finishing, setting and other processes in turn, so as to obtain antibacterial non-woven fabric. However, this method has obvious defects. After being washed and bent for many times, the antibacterial coating is easy to crack and break, resulting in the decrease of antibacterial ability of non-woven fabric and poor long-term antibacterial performance.

[0004] In order to overcome the above problems, many people try to directly melt and blend the antibacterial agent with polypropylene particles, among which silver ion antibacterial agent is the most widely used. Unfortunately, the high temperature resistance of silver ion antibacterial agent is generally poor. During the melt blending process with polypropylene particles, part of the silver ions will be reduced to elemental silver by heat, which greatly affects the antibacterial performance and long-term antibacterial performance, and further leads to the great discount of antibacterial effect of non-woven fabric. Therefore, it is urgent to solve the above problems to meet the higher requirements for antibacterial properties in the field of non-woven fabric technology. SUMMARY

[0005] The present application aims to overcome the defects of the prior art and provides an antibacterial non-woven fabric and a preparation process thereof.

[0006] The purpose of the present application can be achieved by the following technical solutions: An antibacterial non-woven fabric comprises the following raw materials by weight: 60-70 parts of polypropylene resin, 10-20 parts of modified bamboo fiber, 5-8 parts of chitosan and 0.5-1.5 parts of antioxidant.

[0007] As a further technical solution, the antioxidant is one or more of antioxidant 168, antioxidant 1010 and antioxidant 264.

[0008] As a further technical solution, the modified bamboo fiber is prepared by the following steps: S1, in a three-necked round-bottom flask equipped with a magnetic stirrer, a reflux condenser and a constant-pressure dropping funnel, 2-amino-4, 6-dichloro-S-triazine and anhydrous acetonitrile were added, placed in an ice water bath at 0-5℃, and the stirring was started. Then triphenylphosphine was dissolved in anhydrous acetonitrile and added to the flask through the constant-pressure dropping funnel. After the addition was completed, the ice water bath was removed and heated to 80-85℃. The reaction was refluxed for 6-8h. After the reaction was completed, the heating was stopped and the temperature was cooled to room temperature. The filter cake was washed with cold anhydrous acetonitrile and dried in vacuum to obtain the bis-quaternary phosphonium salt product. S2, in a three-necked round-bottom flask equipped with a magnetic stirrer and a reflux condenser, bis-quaternary phosphonium salt product, N,N-dimethylformamide, bessylic acid, dicyclohexyl carbodiimide and 4-dimethylamino pyridine were added. The air was removed by nitrogen for 10min. The stirring was started and heated to 50-55℃. The temperature was maintained for 10-12h. After the reaction was completed, the reaction solution was slowly added to ice water. The organic phase was extracted with dichloromethane. The combined organic phase was washed with saturated sodium bicarbonate aqueous solution, dried, filtered, rotary evaporated, and purified to obtain the amidation product. S3, the bamboo fiber was first placed in a sodium hydroxide solution (10% by mass) and ultrasonically treated for 20-30min. Then it was stirred at room temperature for 6-8h, filtered, washed to neutral, dried, added to an ethanol aqueous solution (volume ratio of ethanol to water was 9:1), ultrasonically treated for 20-30min, added with silane coupling agent KH-550, mechanically stirred at 60-70℃ constant temperature water bath for 1-3h, filtered and dried to obtain the pretreated bamboo fiber. S4, in a three-necked round-bottom flask equipped with a magnetic stirrer and a reflux condenser, the pretreated bamboo fiber was first mixed with N,N-dimethylformamide and ultrasonically treated for 20-30min to uniformly disperse the bamboo fiber. Then the amidation product, dicyclohexyl carbodiimide and 4-dimethylamino pyridine were added in sequence. The reaction system was heated to 50-60℃ and stirred at this temperature for 12-24h. After the reaction was completed, the temperature was cooled to room temperature. The filter cake was washed with N,N-dimethylformamide, methanol and deionized water for 3 times respectively. The product was Soxhlet extracted and purified, and dried to obtain the modified bamboo fiber.

[0009] As a further technical solution, the ratio of the amounts of 2-amino-4, 6-dichloro-S-triazine, anhydrous acetonitrile and triphenylphosphine in step S1 was 16.5g:100mL:45.1-47.5g.

[0010] As a further technical solution, the ratio of the use amount of the bis-quaternary phosphonium salt product, N,N-dimethylformamide, barbital acid, dicyclohexyl carbodiimide and 4-dimethylamino pyridine in step S2 is 60.9 g: 200 mL: 25.2-26.9 g: 20.6 g: 1.7 g.

[0011] As a further technical solution, the ratio of the use amount of the bamboo fiber, sodium hydroxide solution, ethanol aqueous solution and silane coupling agent KH-550 in step S3 is 50 g: 120 mL: 200 mL: 4.2-5.9 g.

[0012] As a further technical solution, the ratio of the use amount of the pretreated bamboo fiber, N,N-dimethylformamide, amidation product, dicyclohexyl carbodiimide and 4-dimethylamino pyridine in step S4 is 50 g: 200 mL: 21.5-22.1 g: 9.7-10.3 g: 0.5-0.7 g.

[0013] In the process of preparing the modified bamboo fiber, the reaction formulae of steps S1 and S2 are as follows: As can be seen from the above reaction, in order to obtain the target product, the use amount of each component in steps S1 and S2 needs to be strictly controlled. In step S1, the molar ratio of 2-amino-4,6-dichloro-S-triazine to triphenylphosphine is close to 1:2, and the latter is in excess. Similarly, in step S2, the amount ratio of the bis-quaternary phosphonium salt product to barbital acid needs to be close to 1:1, and the latter is in excess, so as to reduce the occurrence of side reactions. In step S3, the alkali is used to remove the gum and smooth coating on the surface of the fiber, so that the fiber becomes rough and has more grooves and wrinkles, which greatly increases the specific surface area of the fiber. In addition, the alkali treatment can destroy part of the hydrogen bonds within and between cellulose molecules, increase the number of free hydroxyl groups on the fiber surface and the reactivity, and these activated hydroxyl groups become active sites for subsequent chemical reaction with the silane coupling agent, and introduce amino active groups, which lay the foundation for the acylation reaction in step S4.

[0014] The bamboo fiber is a cheap, short growth cycle, abundant resource, high toughness, low density material, and has certain natural antibacterial property. Through modification of the bamboo fiber, combined with the above reaction formula, it is not difficult to see that the introduced long fatty chain can effectively improve the interfacial compatibility of the bamboo fiber and the polypropylene matrix; the introduced quaternary phosphonium salt group, based on the characteristics of the cation, can cause the destruction of the bacterial membrane structure, the leakage of the contents, and the inactivation of the key enzymes, and can have a synergistic effect with the bamboo fiber, greatly improving the antibacterial property of the matrix. Finally, the small molecule amidation product is connected with the bamboo fiber, improving the resistance to migration and exudation of the organic chain, making the modified bamboo fiber more stable.

[0015] The application further provides a preparation process of the antibacterial non-woven fabric. A1, the modified bamboo fiber is placed in an oven for drying to remove water, and the chitosan is crushed into powder, and sieved to obtain pretreated bamboo fiber and chitosan powder; A2, the polypropylene resin is first added into a high-speed mixer, and then the pretreated bamboo fiber, the chitosan powder and the antioxidant are sequentially added, and high-speed stirring is performed to fully mix and uniformly mix the raw materials, and a mixture is obtained; A3, the mixture is added into a double-screw extruder, the mixture is melt-extruded, and the granulation is performed to obtain a master batch; A4, the master batch is added into a spinning machine for melt spinning, the spun fiber is stretched by airflow traction to form continuous filaments, and then the filaments are uniformly laid on a screen curtain to form a fiber web; A5, the fiber web is sent into a hot calender for hot rolling and reinforcement, cooling and setting, cutting and winding to obtain the antibacterial non-woven fabric.

[0016] As a further technical solution, the drying temperature is 80-100 DEG C, and the time is 3-5h.

[0017] As a further technical solution, the mesh size of the sieving is 100-200 mesh.

[0018] As a further technical solution, the high-speed stirring speed is 1000-1500r / min, and the time is 10-20min.

[0019] As a further technical solution, the temperature of each section of the extruder is as follows: the first section is 170-180 DEG C, the second section is 180-190 DEG C, the third section is 190-200 DEG C, the fourth section is 180-190 DEG C, and the temperature of the die head is 185-195 DEG C, and the screw rotation speed is 200-300r / min.

[0020] As a further technical solution, the spinning temperature is 200-220 DEG C.

[0021] As a further technical solution, in the hot rolling and reinforcement, the hot rolling temperature is 140-150 DEG C, and the pressure is 0.3-0.5MPa.

[0022] The application has the following beneficial effects: 1, the non-woven fabric prepared by the application has antibacterial chitosan and bamboo fiber added in the raw materials, and the antibacterial property of the non-woven fabric is improved; 2, the modification of the bamboo fiber significantly improves the antibacterial property of the non-woven fabric, improves the compatibility of the bamboo fiber and the matrix, and the small-molecule organic link is branched to the bamboo fiber, which significantly improves the migration resistance and the exudation resistance of the antibacterial component, and avoids the problems of easy falling off and poor washing resistance of the traditional coating method; 3. The bamboo fiber and chitosan in the raw materials of the present invention are natural and renewable materials and are environmentally friendly; In summary, the non-woven fabric prepared by the present invention has stable and efficient antibacterial properties and is environmentally friendly, and has important application value in the field of non-woven fabric technology. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] Example 1 Preparation of modified bamboo fiber: S1. In a three-necked round-bottom flask equipped with a magnetic stirrer, a reflux condenser and a constant pressure dropping funnel, 16.5 g of 2-amino-4,6-dichloro-S-triazine and 20 mL of anhydrous acetonitrile were added, placed in an ice-water bath at 0 ° C, and stirring was started. Then 45.1 g of triphenylphosphine was dissolved in 80 mL of anhydrous acetonitrile and added dropwise to the flask through a constant pressure dropping funnel. After the addition was complete, the ice-water bath was removed, and the mixture was heated to 80 ° C. Reflux reaction was carried out for 6 hours. After the reaction was complete, heating was stopped, and the mixture was cooled to room temperature. Filtered with suction, the filter cake was washed with cold anhydrous acetonitrile, and vacuum dried to obtain a diquaternary phosphonium salt product; S2. In a three-necked round-bottom flask equipped with a magnetic stirrer and a reflux condenser, 60.9 g of the diquaternary phosphonium salt product, 200 mL of N,N-dimethylformamide, 25.2 g of brazilic acid, 20.6 g of dicyclohexylcarbodiimide and 1.7 g of 4-dimethylaminopyridine were added, nitrogen was passed through for 10 minutes to exclude air, stirring was started, and the mixture was heated to 50°C, maintained at this temperature, and the reaction was continued for 10 hours. After the reaction was completed, the reaction solution was slowly added dropwise to ice water, and then extracted with dichloromethane. The organic phases were combined, washed with saturated sodium bicarbonate aqueous solution, dried, filtered, rotary evaporated, and purified by column chromatography (eluent: dichloromethane and methanol, the volume ratio of the two was 20:1) to obtain an amidated product; S3. First, 50 g of bamboo fiber was placed in 120 mL of sodium hydroxide solution (mass fraction 10%), ultrasonically treated for 20 min, and then stirred for 6 h at room temperature. The mixture was filtered, washed until neutral, and dried. The mixture was then added to 200 mL of ethanol aqueous solution (the volume ratio of ethanol to water was 9:1). After ultrasonic treatment for 20 min, 4.2 g of silane coupling agent KH-550 was added. The mixture was mechanically stirred in a constant temperature water bath at 60 ° C for 1 h. After the reaction was completed, the mixture was filtered and dried to obtain pretreated bamboo fiber. S4, in a three-mouth round bottom flask equipped with a magnetic stirrer and a reflux condenser, 50 g of pretreated bamboo fiber was first mixed with 200 mL of N,N-dimethylformamide, and ultrasonic treatment was performed for 20 min to uniformly disperse the bamboo fiber, then 21.5 g of amidation product, 9.7 g of dicyclohexyl carbodiimide and 0.5 g of 4-dimethylamino pyridine were added in sequence, then the reaction system was heated to 50℃, and the stirring reaction was continued at this temperature for 12 h, the reaction was completed, and the system was cooled to room temperature, filtered, washed with N,N-dimethylformamide, methanol and deionized water for 3 times respectively, and then the washed fiber was placed in a filter paper cylinder of a Soxhlet extractor, methanol was added to the extraction bottle, and continuous extraction was performed for 24 h, then the extraction was completed, and the fiber was dried to obtain the modified bamboo fiber; A process for preparing an antibacterial non-woven fabric, comprising the following steps: A1, 10 parts of modified bamboo fiber were placed in an oven and dried at 80℃ for 3h to remove water, then 5 parts of chitosan powder were crushed into powder and sieved through a 100 mesh sieve to obtain pretreated bamboo fiber and chitosan powder; A2, in a high-speed mixer, 60 parts of polypropylene resin were first added, then pretreated bamboo fiber, chitosan powder and 0.5 parts of antioxidant 168 were added in sequence, and the mixture was stirred at 1000 r / min for 10 min to obtain a mixture; A3, the mixture was added to a twin-screw extruder (the temperature of each section of the extruder was: zone 1 170℃, zone 2 180℃, zone 3 190℃, zone 4 180℃, and the temperature of the die head was 185℃, and the screw rotation speed was 200 r / min), the mixture was melt-extruded, and the particles were obtained; A4, the master batch was added to a spinning machine, and melt spinning was performed at 200℃, the spun fiber was stretched by air flow to form continuous filaments, and then the filaments were evenly laid on a screen curtain to form a fiber web; A5, the fiber web was sent to a hot calender, and hot rolling and reinforcement were performed at 140℃ and 0.3 MPa, and then the fiber web was cooled, cut and wound to obtain the antibacterial non-woven fabric.

[0025] Example two Preparation of modified bamboo fiber: S1, in a three-mouth round bottom flask equipped with a magnetic stirrer, a reflux condenser and a constant pressure dropping funnel, 16.5 g of 2-amino-4,6-dichloro-S-triazine and 20 mL of anhydrous acetonitrile were added, and the flask was placed in an ice water bath at 5℃ and stirred, then 47.5 g of triphenyl phosphine was dissolved in 80 mL of anhydrous acetonitrile, and the solution was added to the flask through the constant pressure dropping funnel, after the addition was completed, the ice water bath was removed, and the system was heated to 85℃ and refluxed for 8 h, then the heating was stopped, the system was cooled to room temperature, and the filter cake was washed with cold anhydrous acetonitrile, and then vacuum dried to obtain the bis-quaternary phosphonium salt product; S2, in a three-necked round bottom flask equipped with a magnetic stirrer and a reflux condenser, 60.9 g of the product of the quaternary phosphonium salt, 200 mL of N,N-dimethylformamide, 26.9 g of baskill acid, 20.6 g of dicyclohexyl carbodiimide and 1.7 g of 4-dimethylamino pyridine were added, the air was removed by nitrogen for 10 min, the stirring was started and heated to 55°C, the temperature was maintained for 12 h, the reaction was completed, the reaction solution was slowly added to ice water, then extracted with dichloromethane, the organic phase was combined, washed with saturated aqueous sodium bicarbonate solution, dried, filtered, rotary evaporated, and purified by column chromatography (eluent: dichloromethane and methanol, volume ratio 20:1) to obtain the product of amide; S3, 50 g of bamboo fibers were first placed in 120 mL of sodium hydroxide solution (10% by mass fraction), ultrasonic treatment for 30 min, then stirred at room temperature for 8 h, filtered, washed to neutral, dried, then added to 200 mL of ethanol aqueous solution (volume ratio of ethanol to water 9:1), ultrasonic treatment for 30 min, then added 5.9 g of silane coupling agent KH-550, mechanical stirring at 70°C constant temperature water bath for 3 h, reaction was completed, filtered, dried to obtain pretreated bamboo fibers; S4, in a three-necked round bottom flask equipped with a magnetic stirrer and a reflux condenser, 50 g of pretreated bamboo fibers were first mixed with 200 mL of N,N-dimethylformamide, ultrasonic treatment for 30 min to make the bamboo fibers uniformly dispersed, then 22.1 g of the product of amide, 10.3 g of dicyclohexyl carbodiimide and 0.7 g of 4-dimethylamino pyridine were added in turn, then the reaction system was heated to 60°C, and stirred at this temperature for 24 h, the reaction was completed, cooled to room temperature, filtered, washed with N,N-dimethylformamide, methanol and deionized water for 3 times respectively, the washed fibers were placed in the filter paper tube of the soxhlet extractor, methanol was added to the extraction bottle, and continuous extraction was carried out for 24 h, the extraction was completed, and the modified bamboo fibers were obtained after drying; A preparation process of an antibacterial non-woven fabric, comprising the following steps: A1, 15 parts of modified bamboo fibers were placed in an oven and dried at 90°C for 4 h to remove water, then 6.5 parts of chitosan powder was crushed into powder and passed through a 200 mesh sieve to obtain pretreated bamboo fibers and chitosan powder; A2, in a high-speed mixer, 65 parts of polypropylene resin was first added, then pretreated bamboo fibers, chitosan powder and 1.0 part of antioxidant 1010 were added in turn, and the mixture was stirred at 1200 r / min for 15 min to make the raw materials fully mixed and uniform to obtain a mixture; A3, the mixture was added to a twin-screw extruder (the temperature of each section of the extruder was: zone 1 180°C, zone 2 190°C, zone 3 200°C, zone 4 190°C, the temperature of the die head was 195°C, and the screw rotation speed was 300 r / min), the mixture was melt-extruded, and the pellets were obtained to obtain a master batch; A4. Add the masterbatch into the spinning machine and perform melt spinning at 210°C. The spun fibers are stretched by airflow to form continuous filaments. The filaments are then evenly laid on a mesh to form a fiber web. A5. Send the fiber web into a hot rolling mill, perform hot rolling reinforcement at 150°C and 0.4 MPa, cool and shape, cut and roll it to obtain an antibacterial non-woven fabric.

[0026] Example 3 The only difference between this embodiment and the second embodiment is that in this embodiment, a process for preparing an antibacterial non-woven fabric includes the following steps: A1. Place 20 parts of modified bamboo fiber in an oven and dry at 100°C for 5 hours to remove moisture. Then, grind 8 parts of chitosan into powder and pass it through a 200-mesh sieve to obtain pretreated bamboo fiber and chitosan powder; A2, in a high-speed mixer, first add 70 parts of polypropylene resin, then add pretreated bamboo fiber, chitosan powder and 1.5 parts of antioxidant 264 in sequence, and stir at 1500r / min for 20min to fully mix the raw materials to obtain a mixture; A3. Add the mixed material into a twin-screw extruder (the temperature of each section of the extruder is: zone 1 180℃, zone 2 190℃, zone 3 200℃, zone 4 190℃, die head temperature 195℃, screw speed 300r / min), melt extrude the mixed material, and pelletize to obtain masterbatch; A4. Add the masterbatch into the spinning machine and perform melt spinning at 220°C. The spun fibers are stretched by airflow to form continuous filaments. The filaments are then evenly laid on a mesh to form a fiber web. A5. Send the fiber web into a hot rolling mill, perform hot rolling reinforcement at 150°C and 0.5 MPa, cool and shape, cut and roll it to obtain an antibacterial non-woven fabric.

[0027] Comparative Example 1 The only difference between this comparative example and Example 3 is that in this comparative example, an equal amount of unmodified ordinary bamboo fiber is used to replace the modified bamboo fiber to prepare the non-woven fabric.

[0028] Comparative Example 2 The only difference between this comparative example and comparative example 1 is that in this comparative example, 3 parts of didecyldimethylammonium chloride are additionally added to the raw materials as an antibacterial agent to prepare a non-woven fabric.

[0029] The antibacterial properties of Examples 1, 2, and 3 and Comparative Examples 1 and 2 were determined using the QB / T 2591-2003 standard. After washing Examples 1, 2, 3 and Comparative Example 2 30 times, the antibacterial properties were measured again using the same standard. The results of the antibacterial performance measurement are shown in the following table: From the above table, it can be seen that the antibacterial property of the non-woven fabric prepared in the embodiment of the present application is higher than that of the comparative example, and the antibacterial performance can still be effectively maintained after multiple washing, thus the present application has important application value in the field of non-woven fabric technology.

[0030] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be realized in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims.

Claims

1. An antibacterial nonwoven fabric, characterized in that: The invention comprises the following raw materials in parts by weight: 60-70 parts of polypropylene resin, 10-20 parts of modified bamboo fiber, 5-8 parts of chitosan and 0.5-1.5 parts of antioxidant.

2. The antibacterial nonwoven fabric according to claim 1, characterized in that: The modified bamboo fiber is prepared by the following steps: S1. Add 2-amino-4,6-dichloro-S-triazine and anhydrous acetonitrile to a flask, start stirring at 0-5°C, then dissolve triphenylphosphine in anhydrous acetonitrile, add the mixture to the flask, heat to 80-85°C, and reflux for 6-8 hours. The reaction is completed to obtain a diquaternary phosphonium salt product; S2. Add the diquaternary phosphonium salt product, N,N-dimethylformamide, brassyl acid, dicyclohexylcarbodiimide and 4-dimethylaminopyridine to a flask, pass nitrogen, start stirring, and react at 50-55° C. for 10-12 hours. The reaction is completed to obtain an amidation product; S3: first placing the bamboo fiber in a sodium hydroxide solution, ultrasonically treating it, stirring it at room temperature for 6-8 hours, filtering it, washing it until it is neutral, drying it, and then adding it to an ethanol aqueous solution. After ultrasonication, adding a silane coupling agent KH-550, stirring and reacting it at 60-70°C for 1-3 hours, the reaction is completed, and the pretreated bamboo fiber is obtained; S4. In a flask, the pretreated bamboo fiber was mixed with N,N-dimethylformamide. After ultrasonication, the amidation product, dicyclohexylcarbodiimide and 4-dimethylaminopyridine were added in sequence. The mixture was stirred at 50-60°C for 12-24 hours. The reaction was completed to obtain modified bamboo fiber.

3. The antibacterial nonwoven fabric according to claim 2, characterized in that: In step S1, the ratio of 2-amino-4,6-dichloro-S-triazine, anhydrous acetonitrile, and triphenylphosphine is 16.5 g:100 mL:45.1-47.5 g.

4. The antibacterial nonwoven fabric according to claim 2, characterized in that: In step S2, the ratio of the amount of the diquaternary phosphonium salt product, N,N-dimethylformamide, brassyl acid, dicyclohexylcarbodiimide, and 4-dimethylaminopyridine is 60.9 g:200 mL:25.2-26.9 g:20.6 g:1.7 g.

5. The antibacterial nonwoven fabric according to claim 2, characterized in that: In step S3, the ratio of the amount of bamboo fiber, sodium hydroxide solution, ethanol aqueous solution, and silane coupling agent KH-550 is 50g:120mL:200mL:4.2-5.9g.

6. The antibacterial nonwoven fabric according to claim 2, characterized in that: In step S4, the ratio of the amount of pretreated bamboo fiber, N,N-dimethylformamide, amidation product, dicyclohexylcarbodiimide, and 4-dimethylaminopyridine is 50 g:200 mL:21.5-22.1 g:9.7-10.3 g:0.5-0.7 g.

7. The antibacterial nonwoven fabric according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 168 , antioxidant 1010 and antioxidant 264 .

8. A process for preparing an antibacterial nonwoven fabric, for preparing an antibacterial nonwoven fabric according to any one of claims 1 to 6, characterized in that: The following steps are involved: A1. Drying the modified bamboo fiber, grinding chitosan into powder, and sieving to obtain pretreated bamboo fiber and chitosan powder; A2. Add polypropylene resin into a high-speed mixer, then add pretreated bamboo fiber, chitosan powder and antioxidant in sequence, and stir at high speed to fully mix the raw materials to obtain a mixture; A3. Add the mixed material into a twin-screw extruder, melt-extrude the mixed material, and pelletize to obtain masterbatch; A4. Add the masterbatch into the spinning machine for melt spinning. The spun fibers are stretched by airflow to form continuous filaments. The filaments are then evenly laid on a mesh to form a fiber web. A5. Send the fiber web into a hot rolling mill for hot rolling reinforcement, cooling and shaping, cutting and winding to obtain antibacterial non-woven fabric.

9. The process for preparing an antibacterial nonwoven fabric according to claim 8, characterized in that: The spinning temperature is 200-220°C.

10. The process for preparing an antibacterial nonwoven fabric according to claim 8, characterized in that: The hot rolling temperature in the hot rolling reinforcement is 140-150° C. and the pressure is 0.3-0.5 MPa.

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