Intelligent antibacterial fabric system and preparation method thereof

Abstract

The invention discloses an intelligent antibacterial fabric system and a preparation method thereof, and the preparation method comprises the following steps: mixing silver nanoparticles with a chitosan solution, and carrying out ultrasonic dispersion to obtain a nano antibacterial agent suspension; mixing the nano-antibacterial agent suspension with a polylactic acid solution, and preparing nano-antibacterial fibers through an electrostatic spinning technology; a bacterial concentration sensor is embedded into the fabric base material, and the bacterial concentration sensor is made of a graphene nanosheet and polypyrrole composite material; the nano antibacterial fiber is connected with a bacterium concentration sensor through a microfluidic technology to form an antibacterial agent release control module; the control module is fixed to the base material through the hot pressing technology, and the intelligent antibacterial fabric system is obtained through drying and shaping. The system can monitor the concentration of bacteria in the environment in real time and automatically adjust the release amount of the antibacterial agent, so that the antibacterial effect is improved, and the service life is prolonged. The antibacterial agent not only has higher antibacterial efficiency, but also can reduce the use amount of the antibacterial agent, and is environment-friendly.

Description

Technical Field

[0001] The present invention belongs to the field of textile technology, and particularly relates to an intelligent antibacterial fabric system and a preparation method thereof. Background Art

[0002] With the continuous development of the textile field, various antibacterial fabrics have been widely used, especially in the fields of medical and health, home, clothing, etc. However, there are still some problems in the actual use of these products. Currently, the antibacterial fabrics on the market usually adopt the method of fixed release of antibacterial agents, and their antibacterial effects cannot be intelligently adjusted when the environment changes, resulting in a decrease in antibacterial effects or premature consumption of antibacterial agents. In some specific scenarios, such as high humidity or high bacterial concentration environments, the antibacterial function of the fabric is often not durable enough, affecting the use experience.

[0003] In order to improve the performance of antibacterial fabrics, some manufacturers have tried to improve the antibacterial function of fabrics by adding temperature-responsive materials or intelligent color-changing materials. For example, temperature-responsive materials can release more antibacterial agents when the temperature rises, while intelligent color-changing materials can change color when detecting bacteria to prompt users to process. However, such improvements often face the problem that the antibacterial effect cannot be automatically adjusted according to the bacterial concentration, resulting in poor overall antibacterial performance and limited service life of the fabric.

[0004] To solve the deficiencies of existing antibacterial fabrics in actual applications, the present invention provides an antibacterial fabric system capable of intelligently adjusting the release amount of antibacterial agents. By combining sensor technology, nanotechnology, information technology, etc. with antibacterial fabrics, the present invention develops an intelligent antibacterial fabric system capable of real-time monitoring of the number of bacteria in the fabric use environment and automatically adjusting the release amount of antibacterial agents. Thereby improving the antibacterial effect of the fabric, extending its service life, and providing more intelligent and flexible antibacterial protection. Summary of the Invention

[0005] The object of the present invention is to provide an intelligent antibacterial fabric system and a preparation method thereof. The system can not only real-time monitor the number of bacteria in the fabric use environment, but also automatically adjust the release amount of antibacterial agents according to the bacterial concentration, so as to achieve an intelligent antibacterial function, improve the antibacterial effect and service life of the fabric.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a preparation method of an intelligent antibacterial fabric system.

[0008] A preparation method of an intelligent antibacterial fabric system includes the following steps:

[0009] S1. Preparation of nano antibacterial fibers: Mix silver nanoparticles with a chitosan solution, and obtain a nano antibacterial agent suspension through ultrasonic dispersion; Mix the nano antibacterial agent suspension with a polylactic acid solution, and prepare nano antibacterial fibers through electrospinning technology;

[0010] S2. Integration of bacterial concentration sensor: Embed the bacterial concentration sensor into the fabric substrate, and the bacterial concentration sensor is made of a graphene nanosheet and polypyrrole composite material;

[0011] S3. Construction of antibacterial agent release control module: Connect the nano antibacterial fibers obtained in step S1 with the bacterial concentration sensor obtained in step S2 through microfluidic technology to form an antibacterial agent release control module;

[0012] S4. Fabric post-treatment: Fix the control module on the substrate by hot pressing technology, and obtain the intelligent antibacterial fabric system through drying and shaping.

[0013] Preferably, in step S1, the mass concentration of silver nanoparticles in the nano antibacterial agent suspension is 0.5 - 1.5%.

[0014] Preferably, in step S1, the mass concentration of the chitosan solution is 2 - 4%.

[0015] Preferably, in step S1, the mass concentration of the polylactic acid solution is 8 - 12%.

[0016] Preferably, in step S1, the polylactic acid is one of NatureWorks 4032D, Ingeo 4043D, and SynterraPLA 3251D.

[0017] Preferably, in step S1, the volume ratio of the nano antibacterial agent suspension to the polylactic acid solution is 1:10 - 1:30.

[0018] Preferably, in step S1, the electrospinning conditions are: voltage 15 - 18 kV, distance 15 - 18 cm, and spinning solution flow rate 1.5 - 2.0 ml / h.

[0019] Preferably, in step S2, the thickness of the bacterial concentration sensor is 50 - 100 μm.

[0020] Preferably, in step S2, the mass ratio of the graphene nanosheet to polypyrrole is 1:2 - 1:4.

[0021] Preferably, in step S3, the width of the microfluidic channel is 100 - 200 μm, and the depth is 50 - 100 μm.

[0022] Preferably, in the step S3, the response time of the antibacterial agent release control module is 5 - 10 seconds.

[0023] Preferably, in the step S4, the hot pressing temperature is 120 - 150 °C, the pressure is 0.5 - 1.0 MPa, and the time is 10 - 15 minutes.

[0024] Preferably, in the step S4, the drying temperature is 100 - 120 °C.

[0025] Preferably, in the step S4, the shaping temperature is 130 - 150 °C.

[0026] In a second aspect, the present invention provides an intelligent antibacterial fabric system.

[0027] An intelligent antibacterial fabric system, comprising:

[0028] Nanometer antibacterial fibers, composed of chitosan / polylactic acid composite fibers containing silver nanoparticles;

[0029] A bacteria concentration sensor, made of a graphene nanosheet and polypyrrole composite material;

[0030] An antibacterial agent release control module, connecting the nanometer antibacterial fibers and the bacteria concentration sensor through microfluidic technology, and the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacteria concentration detected by the bacteria concentration sensor;

[0031] The intelligent antibacterial fabric system is fixed on a fabric substrate.

[0032] Preferably, the diameter of the nanometer antibacterial fibers is 200 - 400 nm.

[0033] Preferably, the nanometer antibacterial fibers are irregularly distributed.

[0034] Preferably, the thickness of the bacteria concentration sensor is 70 - 90 μm.

[0035] Preferably, the mass ratio of the graphene nanosheet to polypyrrole is 1:2.5 - 1:3.5.

[0036] Preferably, the width of the microfluidic channel is 150 - 170 μm, and the depth is 75 - 85 μm.

[0037] Preferably, the response time of the antibacterial agent release control module is 6 - 8 seconds.

[0038] Preferably, the intelligent antibacterial fabric system is fixed on the fabric substrate through a hot pressing process.

[0039] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0040] (1) The present invention realizes the intelligent adjustment of the antibacterial function of fabrics by integrating a bacterial concentration sensor and an antibacterial agent release control module, which can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration in the environment, thereby improving the antibacterial effect.

[0041] (2) Due to the use of nano antibacterial fibers and microfluidic technology, the release of the antibacterial agent is more accurate and efficient, avoiding the premature consumption of the antibacterial agent and extending the service life of the fabric.

[0042] (3) Compared with the existing antibacterial fabrics, this method not only has a higher antibacterial efficiency, but also can reduce the usage amount of the antibacterial agent, which is environmentally friendly. At the same time, the introduction of the bacterial concentration sensor enables the fabric to have a real-time monitoring function, further improving the use experience. Detailed implementation mode

[0043] The following is a further explanation of the present invention.

[0044] A preparation method of an intelligent antibacterial fabric system of the present invention includes the following steps:

[0045] S1. Prepare nano antibacterial fibers: Mix silver nanoparticles with a chitosan solution, and obtain a nano antibacterial agent suspension through ultrasonic dispersion; mix the nano antibacterial agent suspension with a polylactic acid solution, and prepare nano antibacterial fibers through electrospinning technology;

[0046] Among them, the mass concentration of silver nanoparticles in the nano antibacterial agent suspension is 0.5 - 1.5%, and the mass concentration of the chitosan solution is 2 - 4%; the mass concentration of the polylactic acid solution is 8 - 12%, and the polylactic acid is one of NatureWorks 4032D, Ingeo4043D, and Synterra PLA 3251D; the volume ratio of the nano antibacterial agent suspension to the polylactic acid solution is 1:10 - 1:30; the electrospinning conditions are: voltage 15 - 18 kV, distance 15 - 18 cm, and the flow rate of the spinning solution is 1.5 - 2.0 ml / h.

[0047] S2. Integrate a bacterial concentration sensor: Embed the bacterial concentration sensor into the fabric substrate, and the bacterial concentration sensor is made of a graphene nanosheet and polypyrrole composite material;

[0048] Among them, the thickness of the bacterial concentration sensor is 50 - 100 μm; the mass ratio of the graphene nanosheet to polypyrrole is 1:2 - 1:4.

[0049] S3. Construct an antibacterial agent release control module: Connect the nano antibacterial fibers obtained in step S1 with the bacterial concentration sensor obtained in step S2 through microfluidic technology to form an antibacterial agent release control module;

[0050] Among them, the width of the microfluidic channel is 100 - 200 μm, and the depth is 50 - 100 μm; the response time of the antibacterial agent release control module is 5 - 10 seconds.

[0051] S4. Fabric post-treatment: Fix the control module on the substrate by using a hot pressing technique, and obtain the intelligent antibacterial fabric system through drying and shaping;

[0052] Among them, the hot pressing temperature is 120 - 150 °C, the pressure is 0.5 - 1.0 MPa, and the time is 10 - 15 minutes; the drying temperature is 100 - 120 °C, and the shaping temperature is 130 - 150 °C.

[0053] An intelligent antibacterial fabric system of the present invention includes:

[0054] A nano antibacterial fiber, which is composed of a chitosan / polylactic acid composite fiber containing silver nanoparticles;

[0055] A bacterial concentration sensor, which is made of a graphene nanosheet and polypyrrole composite material;

[0056] An antibacterial agent release control module, which connects the nano antibacterial fiber and the bacterial concentration sensor through a microfluidic technique, and the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor;

[0057] The intelligent antibacterial fabric system is fixed on the fabric substrate through a hot pressing process.

[0058] Among them, the diameter of the nano antibacterial fiber is 200 - 400 nm, showing an irregular distribution.

[0059] The thickness of the bacterial concentration sensor is 70 - 90 μm.

[0060] The mass ratio of the graphene nanosheet to the polypyrrole is 1:2.5 - 1:3.5.

[0061] The width of the microfluidic channel is 150 - 170 μm, and the depth is 75 - 85 μm.

[0062] The response time of the antibacterial agent release control module is 6 - 8 seconds.

[0063] The present invention will be further described below in conjunction with embodiments.

[0064] According to the following embodiments, the present invention can be better understood. However, those skilled in the art can easily understand that the specific material ratios, process conditions and their results described in the embodiments are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0065] Embodiment 1:

[0066] A preparation method of an intelligent antibacterial fabric system, comprising the following steps:

[0067] (1) Prepare nano antibacterial fibers: Mix silver nanoparticles with a 2% chitosan solution by mass concentration, disperse them by ultrasonic for 10 minutes to obtain a nano antibacterial agent suspension, where the mass concentration of silver nanoparticles is 1.0%. Mix this nano antibacterial agent suspension with a 10% polylactic acid solution (where polylactic acid is NatureWorks 4032D) by volume ratio of 1:20, and prepare nano antibacterial fibers by electrospinning technology under the conditions of a voltage of 15 kV, a distance of 15 cm, and a spinning solution flow rate of 1.5 ml / h.

[0068] (2) Integrate a bacteria concentration sensor: Embed the bacteria concentration sensor into the fabric substrate. The bacteria concentration sensor is made of a graphene nanosheet and polypyrrole composite material, where the mass ratio of graphene nanosheets to polypyrrole is 1:3. The thickness of the bacteria concentration sensor is 70 μm. The integration method of the bacteria concentration sensor is to print the bacteria concentration sensor evenly on the surface of the fabric substrate through printing technology to ensure that the bacteria concentration sensor can be evenly distributed and work properly in the fabric.

[0069] (3) Construct an antibacterial agent release control module: Connect the nano antibacterial fibers and the bacteria concentration sensor through microfluidic technology to construct an antibacterial agent release control module. The width of the microfluidic channel is 150 μm, the depth is 75 μm, and the response time of the antibacterial agent release control module is 7 seconds. The antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacteria concentration detected by the bacteria concentration sensor.

[0070] (4) Fabric post-treatment: Fix the antibacterial agent release control module on the fabric substrate through hot pressing technology, with a hot pressing temperature of 130 °C, a pressure of 0.8 MPa, and a time of 12 minutes. Then dry and shape the fabric, with a drying temperature of 100 °C and a shaping temperature of 130 °C, and finally obtain an intelligent antibacterial fabric system.

[0071] Through the above steps, an intelligent antibacterial fabric system is prepared in this embodiment, including nano antibacterial fibers, a bacteria concentration sensor, and an antibacterial agent release control module, where: the nano antibacterial fibers are composed of chitosan / polylactic acid composite fibers containing silver nanoparticles; the bacteria concentration sensor is made of a graphene nanosheet and polypyrrole composite material; the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacteria concentration detected by the bacteria concentration sensor.

[0072] Example 2:

[0073] A preparation method of an intelligent antibacterial fabric system, comprising the following steps:

[0074] (1) Preparation of nano antibacterial fibers: Mix silver nanoparticles with a 3% chitosan solution by mass concentration, and disperse them by ultrasonic wave for 15 minutes to obtain a nano antibacterial agent suspension, where the mass concentration of silver nanoparticles is 1.2%. Mix this nano antibacterial agent suspension with a 11% polylactic acid solution (where the polylactic acid is Ingeo 4043D) by a volume ratio of 1:15, and prepare nano antibacterial fibers through electrospinning technology under the conditions of a voltage of 16 kV, a distance of 16 cm, and a spinning solution flow rate of 1.8 ml / h.

[0075] (2) Integration of bacterial concentration sensor: Embed the bacterial concentration sensor into the fabric substrate. The bacterial concentration sensor is made of a composite material of graphene nanosheets and polypyrrole, where the mass ratio of graphene nanosheets to polypyrrole is 1:2.5. The thickness of the bacterial concentration sensor is 80 μm. The integration method of the bacterial concentration sensor is to spray the bacterial concentration sensor evenly on the surface of the fabric substrate through spraying technology to ensure that the bacterial concentration sensor can be evenly distributed and work normally in the fabric.

[0076] (3) Construction of antibacterial agent release control module: Connect the nano antibacterial fibers and the bacterial concentration sensor through microfluidic technology to construct an antibacterial agent release control module. The width of the microfluidic channel is 170 μm, the depth is 80 μm, and the response time of the antibacterial agent release control module is 6 seconds. This module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0077] (4) Post-treatment of the fabric: Fix the antibacterial agent release control module on the fabric substrate through hot pressing technology. The hot pressing temperature is 135 °C, the pressure is 0.7 MPa, and the time is 13 minutes. Then dry and shape the fabric. The drying temperature is 110 °C, and the shaping temperature is 140 °C to finally obtain an intelligent antibacterial fabric system.

[0078] Through the above steps, this embodiment prepared an intelligent antibacterial fabric system, including nano antibacterial fibers, a bacterial concentration sensor, and an antibacterial agent release control module, where: the nano antibacterial fibers are composed of chitosan / polylactic acid composite fibers containing silver nanoparticles; the bacterial concentration sensor is made of a composite material of graphene nanosheets and polypyrrole; the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0079] Example 3:

[0080] A preparation method of an intelligent antibacterial fabric system, including the following steps:

[0081] (1) Preparation of nano antibacterial fibers: Mix silver nanoparticles with a chitosan solution with a mass concentration of 4%, and disperse them by ultrasonic for 20 minutes to obtain a nano antibacterial agent suspension, where the mass concentration of silver nanoparticles is 1.5%. Mix this nano antibacterial agent suspension with a polylactic acid solution with a mass concentration of 12% (where polylactic acid uses Synterra PLA 3251D) according to a volume ratio of 1:10, and prepare nano antibacterial fibers through electrospinning technology under the conditions of a voltage of 17 kV, a distance of 17 cm, and a spinning solution flow rate of 2.0 ml / h.

[0082] (2) Integration of bacterial concentration sensor: Embed the bacterial concentration sensor into the fabric substrate. The bacterial concentration sensor is made of a graphene nanosheet and polypyrrole composite material, where the mass ratio of graphene nanosheets to polypyrrole is 1:4. The thickness of the bacterial concentration sensor is 100 μm. The integration method of the bacterial concentration sensor is to evenly embed the bacterial concentration sensor into the fabric substrate through a hot melt technology to ensure that the bacterial concentration sensor can be evenly distributed and work properly in the fabric.

[0083] (3) Construction of antibacterial agent release control module: Connect the nano antibacterial fibers and the bacterial concentration sensor through microfluidic technology to construct an antibacterial agent release control module. The width of the microfluidic channel is 200 μm, the depth is 100 μm, and the response time of the antibacterial agent release control module is 5 seconds. This module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0084] (4) Fabric post-treatment: Fix the antibacterial agent release control module on the fabric substrate through hot pressing technology, with a hot pressing temperature of 150 °C, a pressure of 0.5 MPa, and a time of 15 minutes. Then dry and shape the fabric, with a drying temperature of 120 °C and a shaping temperature of 150 °C, and finally obtain an intelligent antibacterial fabric system.

[0085] Through the above steps, this embodiment prepared an intelligent antibacterial fabric system, including nano antibacterial fibers, a bacterial concentration sensor, and an antibacterial agent release control module, where: the nano antibacterial fibers are composed of chitosan / polylactic acid composite fibers containing silver nanoparticles; the bacterial concentration sensor is made of a graphene nanosheet and polypyrrole composite material; the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0086] Example 4:

[0087] A preparation method of an intelligent antibacterial fabric system, including the following steps:

[0088] (1) Preparation of nano antibacterial fibers: Mix silver nanoparticles with a chitosan solution with a mass concentration of 3%, and disperse them by ultrasonic for 20 minutes to obtain a nano antibacterial agent suspension, where the mass concentration of silver nanoparticles is 0.5%. Mix this nano antibacterial agent suspension with a polylactic acid solution with a mass concentration of 8% (where polylactic acid is NatureWorks 4032D) at a volume ratio of 1:30, and prepare nano antibacterial fibers by electrospinning technology under the conditions of a voltage of 18 kV, a distance of 18 cm, and a spinning solution flow rate of 1.5 ml / h.

[0089] (2) Integration of bacterial concentration sensor: Embed the bacterial concentration sensor into the fabric substrate. The bacterial concentration sensor is made of a composite material of graphene nanosheets and polypyrrole, where the mass ratio of graphene nanosheets to polypyrrole is 1:2. The thickness of the bacterial concentration sensor is 50 μm. The integration method of the bacterial concentration sensor is to evenly embed the bacterial concentration sensor into the fabric substrate through a hot melt technology to ensure that the bacterial concentration sensor can be evenly distributed and work properly in the fabric.

[0090] (3) Construction of antibacterial agent release control module: Connect the nano antibacterial fibers and the bacterial concentration sensor through a microfluidic technology to construct an antibacterial agent release control module. The width of the microfluidic channel is 100 μm, the depth is 500 μm, and the response time of the antibacterial agent release control module is 10 seconds. This module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0091] (4) Fabric post-treatment: Fix the antibacterial agent release control module on the fabric substrate through a hot pressing technology, with a hot pressing temperature of 120 °C, a pressure of 1.0 MPa, and a time of 10 minutes. Then dry and shape the fabric, with a drying temperature of 110 °C and a shaping temperature of 140 °C, and finally obtain an intelligent antibacterial fabric system.

[0092] Through the above steps, an intelligent antibacterial fabric system is prepared in this embodiment, including nano antibacterial fibers, a bacterial concentration sensor, and an antibacterial agent release control module, where: the nano antibacterial fibers are composed of chitosan / polylactic acid composite fibers containing silver nanoparticles; the bacterial concentration sensor is made of a composite material of graphene nanosheets and polypyrrole; the antibacterial agent release control module can automatically adjust the release amount of the antibacterial agent according to the bacterial concentration detected by the bacterial concentration sensor.

[0093] Comparative Example 1:

[0094] In this comparative example, the bacterial concentration sensor is not added, and the antibacterial fabric is prepared by the same method as in the above example for other steps. The steps are as follows:

[0095] (1) Preparation of nano antibacterial fibers: Mix silver nanoparticles with a 2% chitosan solution by mass concentration, and disperse them by ultrasonic wave for 10 minutes to obtain a nano antibacterial agent suspension, where the mass concentration of silver nanoparticles is 1.0%. Mix this nano antibacterial agent suspension with a 10% polylactic acid solution (using NatureWorks 4032D) according to a volume ratio of 1:20, and prepare nano antibacterial fibers by electrospinning technology under the conditions of a voltage of 15 kV, a distance of 15 cm, and a spinning solution flow rate of 1.5 ml / h.

[0096] (2) Fabric post-treatment: Fix the nano antibacterial fibers on the fabric substrate by hot pressing technology, with a hot pressing temperature of 130 °C, a pressure of 0.8 MPa, and a time of 12 minutes. Then dry and shape the fabric, with a drying temperature of 100 °C and a shaping temperature of 130 °C, and finally obtain an antibacterial fabric system.

[0097] In Comparative Example 1, no bacterial concentration sensor was added, so the release amount of the antibacterial agent could not be automatically adjusted according to the bacterial concentration.

[0098] Antibacterial performance measurement

[0099] Use the American Sartorius bacteria detector to test the antibacterial performance of the fabrics in Examples 1 - 3 and Comparative Examples 1 - 3 according to the standard GB / T 20944.2 - 2007, and characterize it by the antibacterial rate. The results are shown in Table 1.

[0100] Table 1

[0101] Sample number Antibacterial rate / % Example 1 99.9 Example 2 99.8 Example 3 99.7 Comparative example 1 85.0

[0102] The standard GB / T 20944.2 - 2007 stipulates that only when the antibacterial rate of textiles is greater than 90% can it be called an antibacterial product. It can be seen from Table 1 that the intelligent antibacterial fabric system prepared in the examples has an efficient antibacterial function, while the fabrics prepared in the comparative examples have poor antibacterial functions. The reason is that there is no bacterial concentration sensor in Comparative Example 1, and the intelligent release of the antibacterial agent cannot be realized, so the antibacterial effect is poor.

[0103] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing an intelligent antibacterial fabric system, characterized in that: The following steps are involved: S1. Preparation of nano antibacterial fibers: mixing silver nanoparticles with chitosan solution, and obtaining a nano antibacterial agent suspension by ultrasonic dispersion; The nano antibacterial agent suspension is mixed with the polylactic acid solution to prepare the nano antibacterial fiber by electrospinning technology; S2. Integrated bacteria concentration sensor: embedding a bacteria concentration sensor into a fabric substrate, wherein the bacteria concentration sensor is made of a graphene nanosheet and a polypyrrole composite material; S3, constructing an antimicrobial agent release control module: connecting the nano antimicrobial fiber obtained in step S1 with the bacteria concentration sensor obtained in step S2 through microfluidic technology to form an antimicrobial agent release control module; S4, fabric finishing: the control module is fixed to the base material by using hot pressing technology, and the intelligent antibacterial fabric system is obtained by drying and shaping.

2. The preparation method according to claim 1, characterized in that: In step S1: The mass concentration of silver nanoparticles in the nano-antibacterial agent suspension is 0.5-1.5%, and the mass concentration of chitosan solution is 2-4%; The mass concentration of the polylactic acid solution is 8-12%, and the polylactic acid is one of NatureWorks 4032D, Ingeo 4043D and Synterra PLA 3251D; The volume ratio of the nano antibacterial agent suspension to the polylactic acid solution is 1:10-1:30; The electrospinning conditions are: voltage 15-18 kV, distance 15-18 cm, spinning solution flow rate 1.5-2.0 ml / h.

3. The preparation method according to claim 1, characterized in that: In step S2: The thickness of the bacteria concentration sensor is 50-100 μm, and the mass ratio of graphene nanosheets to polypyrrole is 1:2-1:

4.

4. The preparation method according to claim 1, characterized in that: In step S3: The microfluidic channel has a width of 100-200 μm and a depth of 50-100 μm; The response time of the antimicrobial agent release control module is 5-10 seconds.

5. The preparation method according to claim 1, characterized in that: In step S4: The hot pressing temperature is 120-150°C, the pressure is 0.5-1.0MPa, and the time is 10-15 minutes; The drying temperature is 100-120°C, and the setting temperature is 130-150°C.

6. An intelligent antibacterial fabric system, characterized in that: include: Nano antibacterial fiber, composed of chitosan / polylactic acid composite fiber containing silver nanoparticles; Bacteria concentration sensor made of graphene nanosheets and polypyrrole composites; An antimicrobial agent release control module is connected to the nano antimicrobial fiber and the bacteria concentration sensor through microfluidic technology, and the antimicrobial agent release control module can automatically adjust the release amount of the antimicrobial agent according to the bacteria concentration detected by the bacteria concentration sensor; The intelligent antibacterial fabric system is fixed on the fabric substrate.

7. The system according to claim 6, characterized in that: The diameter of the nano antibacterial fibers is 200-400 nm and is irregularly distributed.

8. The system according to claim 6, characterized in that: The thickness of the bacteria concentration sensor is 70-90 μm, and the mass ratio of graphene nanosheets to polypyrrole is 1:2.5-1:3.

5.

9. The system according to claim 6, characterized in that: The width of the microfluidic channel is 150-170 μm, and the depth is 75-85 μm; the response time of the antimicrobial agent release control module is 6-8 seconds.

10. The system according to claim 6, characterized in that: The intelligent antibacterial fabric system is fixed on the fabric substrate through a hot pressing process.