Antibacterial nonwoven fabric and process for producing the same

Abstract

The application discloses antibacterial non-woven fabric and a preparation process thereof, and belongs to the technical field of non-woven fabric. The antibacterial non-woven fabric 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. The chitosan and the bamboo fiber both have certain antibacterial property, and the antibacterial property of the non-woven fabric is improved. The antibacterial property of the non-woven fabric is significantly improved by modifying the bamboo fiber, the compatibility of the bamboo fiber and the matrix is improved, small-molecule organic link branches are connected to the bamboo fiber, the migration resistance and the bleeding resistance of the antibacterial component are significantly improved, and the problems of easy falling off and poor washing resistance of the traditional coating method are avoided. The bamboo fiber and the chitosan in the raw materials are natural and renewable materials, and are environment-friendly. In conclusion, the non-woven fabric prepared by the application has stable and efficient antibacterial property and is environment-friendly, and has important application value in the technical field of non-woven fabric.

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 degrade, but also shorten the service life. 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:

[0007] 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.

[0008] As a further technical solution, the antioxidant is one or more of antioxidant 168, antioxidant 1010 and antioxidant 264.

[0009] As a further technical solution, the modified bamboo fiber is prepared by the following steps:

[0010] 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 dropwise into the flask through the constant-pressure dropping funnel. After the dropwise 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 filtered and washed with cold anhydrous acetonitrile, and then dried in vacuum to obtain the bis-quaternary phosphonium salt product.

[0011] 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 the temperature was 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. Then dichloromethane was used for extraction. The organic phase was washed with saturated sodium bicarbonate aqueous solution, dried, filtered, rotary evaporated, and purified to obtain the amidation product.

[0012] S3, the bamboo fiber was first placed in a sodium hydroxide solution (10% by mass) and ultrasonically treated for 20-30min. Then the bamboo fiber was continuously stirred at room temperature for 6-8h, filtered, washed to neutral, dried, and then added to an ethanol aqueous solution (the volume ratio of ethanol to water was 9:1). The bamboo fiber was ultrasonically treated for 20-30min, and then silane coupling agent KH-550 was added. The bamboo fiber was mechanically stirred at 60-70℃ constant temperature water bath for 1-3h. After the reaction was completed, the bamboo fiber was filtered and dried to obtain the pretreated bamboo fiber.

[0013] 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 sequentially added. Subsequently, the reaction system was heated to 50-60℃ and continuously stirred at this temperature for 12-24h. After the reaction was completed, the temperature was cooled to room temperature. The bamboo fiber was filtered, washed with N,N-dimethylformamide, methanol and deionized water for 3 times respectively, and then Soxhlet extracted and purified. Finally, the bamboo fiber was dried to obtain the modified bamboo fiber.

[0014] As a further technical solution, the ratio of the amount of 2-amino-4,6-dichloro-S-triazine, anhydrous acetonitrile, triphenylphosphine in step S1 is 16.5g:100mL:45.1-47.5g.

[0015] As a further technical solution, the ratio of the amount of bis-quaternary phosphonium salt product, N,N-dimethylformamide, barbituric acid, dicyclohexyl carbodiimide, 4-dimethylamino pyridine in step S2 is 60.9g:200mL:25.2-26.9g:20.6g:1.7g.

[0016] As a further technical solution, the ratio of the amount of bamboo fiber, sodium hydroxide solution, ethanol aqueous solution, silane coupling agent KH-550 in step S3 is 50g:120mL:200mL:4.2-5.9g.

[0017] As a further technical solution, the ratio of the amount of pretreated bamboo fiber, N,N-dimethylformamide, amide product, dicyclohexyl carbodiimide, 4-dimethylamino pyridine in step S4 is 50g:200mL:21.5-22.1g:9.7-10.3g:0.5-0.7g.

[0018] In the process of preparing the modified bamboo fiber, the reaction formulas of steps S1 and S2 are as follows:

[0019]

[0020] As can be seen from the above reaction, in order to obtain the target product, the amount of each component in steps S1 and S2 needs to be strictly controlled, wherein the amount ratio of 2-amino-4,6-dichloro-S-triazine to triphenylphosphine in step S1 is close to 1:2, and the latter is in excess, and for the same reason, the amount ratio of bis-quaternary phosphonium salt product to barbituric acid in step S2 is close to 1:1, and the latter is in excess, so as to reduce the occurrence of side reactions.

[0021] In step S3, first, the alkali removes the gum and smooth coating on the surface of the fiber, making it rough, with more grooves and wrinkles, which greatly increases the specific surface area of the fiber; in addition, alkali treatment can destroy part of the intramolecular and intermolecular hydrogen bonds of cellulose molecules, increase the number of free hydroxyl groups on the fiber surface and the reactivity, these activated hydroxyl groups become active sites for subsequent chemical reaction with silane coupling agent, and introduce amino active groups, which lay the foundation for the acylation reaction in step S4.

[0022] Bamboo fiber is a cheap, short growth cycle, abundant resources, high toughness, low density material, and has certain natural antibacterial property, through modification of bamboo fiber, combined with the above reaction formula, it is not difficult to see that the introduced long aliphatic chain can effectively improve the interfacial compatibility of bamboo fiber and polypropylene matrix; the introduced quaternary phosphonium salt group, based on the characteristics of cations, through adsorption, penetration, and then causing bacterial membrane structure damage, content leakage, and a series of fatal effects such as key enzyme inactivation, can play a synergistic effect with bamboo fiber, greatly improving the antibacterial property of the matrix, finally, the small molecule amide product is connected with the bamboo fiber, and the migration resistance and exudation resistance of the organic chain are improved, so that the modified bamboo fiber is more stable.

[0023] The application further provides a preparation process of the antibacterial non-woven fabric.

[0024] A1, the modified bamboo fiber is placed in an oven for drying to remove water, and chitosan is crushed into powder, and sieved to obtain pretreated bamboo fiber and chitosan powder;

[0025] 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, so as to obtain a mixture;

[0026] 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;

[0027] 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;

[0028] 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.

[0029] As a further technical solution, the drying temperature is 80-100 DEG C, and the time is 3-5h.

[0030] As a further technical solution, the mesh size of the sieving is 100-200 mesh.

[0031] As a further technical solution, the rotation speed of the high-speed stirring is 1000-1500r / min, and the time is 10-20min.

[0032] 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, the die temperature is 185-195 DEG C, and the screw rotation speed is 200-300r / min.

[0033] As a further technical solution, the spinning temperature is 200-220 DEG C.

[0034] As a further technical solution, the hot rolling temperature in the hot rolling reinforcement is 140-150 DEG C, and the pressure is 0.3-0.5 MPa.

[0035] The beneficial effects of the present application are:

[0036] 1. The non-woven fabric prepared by the present application has antibacterial properties, and the antibacterial properties of the non-woven fabric are improved.

[0037] 2. The modification of the bamboo fiber significantly improves the antibacterial properties of the non-woven fabric, and improves the compatibility of the bamboo fiber and the matrix. At the same time, the small molecule organic linker is branched to the bamboo fiber, which significantly improves the migration resistance and the penetration resistance of the antibacterial component, and avoids the problems of easy falling off and poor washing resistance of the traditional coating method.

[0038] 3. The bamboo fiber and chitosan in the raw material of the present application are natural and renewable materials, and are environmentally friendly.

[0039] In summary, the non-woven fabric prepared by the present application has stable and efficient antibacterial properties, is environmentally friendly, and has important application value in the field of non-woven fabric technology. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] Embodiment one

[0042] Preparation of modified bamboo fiber:

[0043] S1, in a three-necked round-bottom flask equipped with a magnetic stirrer, a reflux condenser and a constant-pressure dropping funnel, 16.5g 2-amino-4, 6-dichloro-S-triazine and 20mL anhydrous acetonitrile were added, placed in an ice water bath at 0 DEG C, and the stirring was started. Then 45.1g triphenylphosphine was dissolved in 80mL anhydrous acetonitrile, and was 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 DEG C. The reflux reaction was carried out for 6h. After the reaction was completed, the heating was stopped, and the temperature was cooled to room temperature. The filter cake was filtered and washed with cold anhydrous acetonitrile, and vacuum dried to obtain a bis-quaternary phosphonium salt product.

[0044] 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, 25.2 g of bessylic 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 50℃, the temperature was maintained for 10 h, the reaction was completed, the reaction solution was slowly dropped into ice water, then extracted with dichloromethane, the organic phase was combined, washed with saturated sodium bicarbonate aqueous solution, dried, filtered, rotary evaporated, and purified by column chromatography (eluent: dichloromethane and methanol, volume ratio 20:1) to obtain the product of the amidation reaction;

[0045] S3, 50 g of bamboo fibers were first placed in 120 mL of sodium hydroxide solution (10% by mass fraction), ultrasonically treated for 20 min, then stirred at room temperature for 6 h, filtered, washed to neutral, dried, then added to 200 mL of ethanol aqueous solution (volume ratio of ethanol to water 9:1), ultrasonically treated for 20 min, then added with 4.2 g of silane coupling agent KH-550, mechanically stirred at 60℃ constant temperature water bath for 1 h, the reaction was completed, filtered, dried to obtain the pretreated bamboo fibers;

[0046] S4, in a three-necked round bottom flask equipped with a magnetic stirrer and a reflux condenser, 50 g of the pretreated bamboo fibers were first mixed with 200 mL of N,N-dimethylformamide, ultrasonically treated for 20 min to uniformly disperse the bamboo fibers, then added with 21.5 g of the product of the amidation reaction, 9.7 g of dicyclohexyl carbodiimide and 0.5 g of 4-dimethylamino pyridine, then heated to 50℃, the reaction was continuously stirred at this temperature for 12 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 a soxhlet extractor, methanol was added in the extraction bottle, continuously extracted for 24 h, the extraction was completed, dried to obtain the modified bamboo fibers;

[0047] A preparation process of an antibacterial non-woven fabric, comprising the following steps:

[0048] A1, 10 parts of the modified bamboo fibers were placed in an oven and dried at 80℃ for 3 h to remove water, then 5 parts of chitosan powder was crushed into powder and passed through a 100 mesh sieve to obtain the pretreated bamboo fibers and chitosan powder;

[0049] A2, 60 parts of polypropylene resin were first added into a high-speed mixer, then the pretreated bamboo fibers, chitosan powder and 0.5 parts of antioxidant 168 were sequentially added, and the materials were fully mixed and uniformly stirred at 1000 r / min for 10 min to obtain a mixture;

[0050] A3, the mixture is added into a twin-screw extruder (temperature of each section of the extruder: 170℃ for the first section, 180℃ for the second section, 190℃ for the third section, 180℃ for the fourth section, 185℃ for the die head, and the screw rotation speed is 200r / min), the mixture is melt-extruded, and granulated to obtain the master batch;

[0051] A4, the master batch is added into a spinning machine, melt spinning is performed at 200℃, the spun fibers are drawn by air flow to form continuous filaments, and the filaments are evenly laid on a screen curtain to form a fiber web;

[0052] A5, the fiber web is sent into a hot calender, hot calendering is performed at 140℃ and 0.3MPa, and the fiber web is cooled, shaped, cut, and wound to obtain the antibacterial non-woven fabric.

[0053] Example Two

[0054] Preparation of modified bamboo fibers:

[0055] S1, a three-necked round-bottom flask equipped with a magnetic stirrer, a reflux condenser, and a constant-pressure dropping funnel is charged with 16.5g of 2-amino-4,6-dichloro-S-triazine and 20mL of anhydrous acetonitrile, placed in an ice-water bath at 5℃, and the stirring is started, 47.5g of triphenylphosphine is dissolved in 80mL of anhydrous acetonitrile, and added dropwise into the flask through the constant-pressure dropping funnel, after the dropwise addition is completed, the ice-water bath is removed, heated to 85℃, and refluxed for 8h, the reaction is completed, the heating is stopped, cooled to room temperature, filtered, the filter cake is washed with cold anhydrous acetonitrile, and vacuum dried to obtain a bis-quaternary phosphonium salt product;

[0056] S2, a three-necked round-bottom flask equipped with a magnetic stirrer and a reflux condenser is charged with 60.9g of the bis-quaternary phosphonium salt product, 200mL of N,N-dimethylformamide, 26.9g of barbital, 20.6g of dicyclohexyl carbodiimide, and 1.7g of 4-dimethylamino pyridine, the air is removed by nitrogen for 10min, the stirring is started, and heated to 55℃, the temperature is maintained, and the reaction is continuously performed for 12h, the reaction is completed, the reaction solution is slowly added into ice water, extracted with dichloromethane, the organic phases are combined, washed with saturated sodium bicarbonate aqueous solution, dried, filtered, rotary evaporated, and purified by column chromatography (eluent: dichloromethane and methanol, volume ratio 20:1) to obtain an amide product;

[0057] S3, 50g of bamboo fibers are first placed in 120mL of a sodium hydroxide solution (mass fraction 10%), ultrasonic treatment is performed for 30min, the stirring is continuously performed at room temperature for 8h, filtered, washed to neutral, dried, and then added into 200mL of an ethanol aqueous solution (volume ratio of ethanol to water 9:1), ultrasonic treatment is performed for 30min, 5.9g of silane coupling agent KH-550 is added, mechanical stirring is performed at a constant temperature water bath of 70℃ for 3h, the reaction is completed, filtered, and dried to obtain pretreated bamboo fibers;

[0058] S4, in a three-mouth round bottom flask equipped with magnetic stirrer and reflux condenser, 50g pretreated bamboo fiber was first mixed with 200ml N,N-dimethylformamide, ultrasonic treatment for 30min, so that the bamboo fiber was uniformly dispersed, then 22.1g amidation product, 10.3g dicyclohexyl carbodiimide and 0.7g 4-dimethylamino pyridine were added in turn, then the reaction system was heated to 60℃, and the reaction was continuously stirred at this temperature for 24h, the reaction was completed, cooled to room temperature, filtered, washed with N,N-dimethylformamide, methanol and deionized water for 3 times respectively, the washed fiber was put into the filter paper cylinder of soxhlet extractor, methanol was added into the extraction bottle, and continuous extraction was carried out for 24h, after the extraction was completed, the modified bamboo fiber was obtained by drying;

[0059] A process for preparing an antibacterial non-woven fabric, comprising the following steps:

[0060] A1, 15 parts of modified bamboo fiber were put into an oven and dried at 90℃ for 4h to remove water, then 6.5 parts of chitosan powder were crushed into powder and sieved through a 200 mesh sieve to obtain pretreated bamboo fiber and chitosan powder;

[0061] A2, in a high-speed mixer, 65 parts of polypropylene resin were first added, then pretreated bamboo fiber, chitosan powder and 1.0 parts of antioxidant 1010 were added in turn, and the mixture was stirred at 1200r / min for 15min to make the raw materials fully mixed and uniform, thus obtaining a mixture;

[0062] A3, the mixture was added into a twin-screw extruder (the temperature of each section of the extruder was: zone 1 180℃, zone 2 190℃, zone 3 200℃, zone 4 190℃, and the temperature of the die head was 195℃, and the screw rotation speed was 300r / min), the mixture was melt-extruded, pelletized, and a master batch was obtained;

[0063] A4, the master batch was added into a spinning machine and melt-spun at 210℃, the spun fiber was drawn by air flow to form continuous filaments, and then the filaments were evenly laid on a screen curtain to form a web;

[0064] A5, the web was sent into a hot calender to be hot-calendered and reinforced at 150℃ and 0.4MPa, and then cooled, cut and wound to obtain an antibacterial non-woven fabric.

[0065] Example three

[0066] The difference between this example and example two is that, in this example, a process for preparing an antibacterial non-woven fabric, comprising the following steps:

[0067] A1, 20 parts of modified bamboo fibers were placed in an oven and dried at 100℃ for 5h to remove moisture, and 8 parts of chitosan powder was crushed into powder and sieved through a 200 mesh sieve to obtain pretreated bamboo fibers and chitosan powder;

[0068] A2, 70 parts of polypropylene resin were first added to a high-speed mixer, and then pretreated bamboo fibers, chitosan powder and 1.5 parts of antioxidant 264 were sequentially added, and stirred at 1500r / min for 20min to fully mix and evenly distribute the raw materials, to obtain a mixture;

[0069] A3, the mixture was added to a twin-screw extruder (the temperature of each section of the extruder was: zone 1 180℃, zone 2 190℃, zone 3 200℃, zone 4 190℃, and the die temperature was 195℃, and the screw rotation speed was 300r / min), and the mixture was melt-extruded and cut into granules to obtain a master batch;

[0070] A4, the master batch was added to a spinning machine and melt-spun at 220℃, the spun fibers were drawn by air flow to form continuous filaments, and then the filaments were evenly laid on a screen curtain to form a web;

[0071] A5, the web was sent to a hot calender and hot-calendered at 150℃ and 0.5MPa to reinforce, cool and set, cut and wind to obtain an antibacterial non-woven fabric.

[0072] Comparative Example One

[0073] The difference between this comparative example and Example Three is that in this comparative example, an equal amount of unmodified ordinary bamboo fibers was used to replace the modified bamboo fibers to prepare the non-woven fabric.

[0074] Comparative Example Two

[0075] The difference between this comparative example and Comparative Example One is that in this comparative example, 3 parts of didecyldimethylammonium chloride was additionally added as an antibacterial agent to prepare the non-woven fabric.

[0076] The antibacterial properties of Examples One, Two, Three and Comparative Examples One and Two were measured according to the QB / T 2591-2003 standard;

[0077] After washing the Examples One, Two, Three and Comparative Example Two for 30 times, the antibacterial properties were measured again using the same standard;

[0078] The measured results of the antibacterial properties are shown in the following table:

[0079]

[0080] From the above table, it can be seen that the non-woven fabric prepared in the embodiment of the application has higher antibacterial property than the comparative examples, and the antibacterial property can still be effectively maintained after multiple water washing, so the application has important application value in the field of non-woven fabric technology.

[0081] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. An antibacterial nonwoven fabric, characterized in that, The raw materials include the following components 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; The modified bamboo fiber is prepared by the following steps: S1, in a flask, 2-amino-4, 6-dichloro-S-triazine and anhydrous acetonitrile are added, stirring is started at 0-5℃, then triphenylphosphine is dissolved in anhydrous acetonitrile and added to the flask, heated to 80-85℃, refluxed for 6-8h, the reaction is completed to obtain a bis-quaternary phosphonium salt product; S2, in a flask, the bis-quaternary phosphonium salt product, N,N-dimethylformamide, bessylic acid, dicyclohexyl carbodiimide and 4-dimethylamino pyridine are added, nitrogen is passed, stirring is started, and the reaction is carried out at 50-55℃ for 10-12h, the reaction is completed to obtain an amidation product; S3, first, the bamboo fiber is placed in a sodium hydroxide solution, after ultrasonic treatment, stirring is carried out at room temperature for 6-8h, then filtered, washed to neutral, dried, then added to an ethanol aqueous solution, after ultrasonic treatment, silane coupling agent KH-550 is added, stirring is carried out at 60-70℃ for 1-3h, the reaction is completed to obtain pretreated bamboo fiber; S4, in a flask, the pretreated bamboo fiber is mixed with N,N-dimethylformamide, after ultrasonic treatment, the amidation product, dicyclohexyl carbodiimide and 4-dimethylamino pyridine are added in sequence, stirring is carried out at 50-60℃ for 12-24h, the reaction is completed to obtain modified bamboo fiber.

2. The antibacterial nonwoven fabric according to claim 1, wherein The ratio of the amounts of 2-amino-4, 6-dichloro-S-triazine, anhydrous acetonitrile and triphenylphosphine in step S1 is 16.5g:100mL:45.1-47.5g.

3. The antibacterial nonwoven fabric according to claim 1, wherein The ratio of the amounts of bis-quaternary phosphonium salt product, N,N-dimethylformamide, bessylic acid, dicyclohexyl carbodiimide and 4-dimethylamino pyridine in step S2 is 60.9g:200mL:25.2-26.9g:20.6g:1.7g.

4. The antibacterial nonwoven fabric according to claim 1, wherein The ratio of the amounts of bamboo fiber, sodium hydroxide solution, ethanol aqueous solution and silane coupling agent KH-550 in step S3 is 50g:120mL:200mL:4.2-5.9g.

5. The antibacterial nonwoven fabric according to claim 1, wherein The ratio of the amounts of pretreated bamboo fiber, N,N-dimethylformamide, amidation product, dicyclohexyl carbodiimide and 4-dimethylamino pyridine in step S4 is 50g:200mL:21.5-22.1g:9.7-10.3g:0.5-0.7g.

6. The antibacterial nonwoven fabric according to claim 1, wherein The antioxidant is one or more of antioxidant 168, antioxidant 1010 and antioxidant 264.

7. A process for the preparation of an antibacterial nonwoven fabric according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: A1, the modified bamboo fiber is dried, then the chitosan is crushed into powder, sieved to obtain pretreated bamboo fiber and chitosan powder; A2, in a high-speed mixer, the polypropylene resin is first added, then the pretreated bamboo fiber, chitosan powder and antioxidant are added in sequence, high-speed stirring is carried out to fully mix and uniformly distribute the raw materials, to obtain a mixture; A3, the mixture is added to a twin-screw extruder, the mixture is melt-extruded, pelletized to obtain a master batch; A4, adding the master batch into the spinning machine, melt spinning, the spun fiber is drawn by airflow traction, forming continuous filaments, then the filaments are evenly laid on the screen curtain, forming a web; A5, sending the web into the hot calender for hot calendering and reinforcement, cooling and setting, cutting and winding, obtaining the antibacterial non-woven fabric.

8. The process for producing an antibacterial nonwoven fabric according to claim 7, wherein The spinning temperature is 200-220℃.

9. The process for preparing an antibacterial nonwoven fabric according to claim 7, wherein The hot calendering temperature is 140-150℃ and the pressure is 0.3-0.5MPa.

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