Antibacterial and ultraviolet resistant fabric and preparation method thereof

Abstract

The application discloses a preparation method of antibacterial and anti-ultraviolet fabric, which comprises the following steps: forming antibacterial nanometer composite fibers by using antibacterial spinning solution and covering the antibacterial nanometer composite fibers on the surface of a base cloth to form an antibacterial layer, wherein the antibacterial spinning solution contains polylactic acid; forming anti-ultraviolet nanometer composite fibers by using anti-ultraviolet spinning solution and covering the anti-ultraviolet nanometer composite fibers on the antibacterial layer to form an anti-ultraviolet layer; covering transfer paper on the surface of the base cloth, and covering patterns on the surface of the anti-ultraviolet layer by heat pressing to form a printing layer, so as to obtain the antibacterial and anti-ultraviolet fabric; during the heat pressing process, the polylactic acid in the antibacterial layer is melted and adheres the base cloth, the antibacterial layer and the anti-ultraviolet layer. According to the antibacterial and anti-ultraviolet fabric preparation method, the antibacterial layer and the anti-ultraviolet layer are covered on the surface of the base cloth in sequence by using an electrostatic spinning process, the printing layer is covered on the surface of the anti-ultraviolet layer by heat pressing, meanwhile, the temperature of the heat pressing is used to melt the polylactic acid, and the printing layer, the anti-ultraviolet layer, the antibacterial layer and the base cloth are tightly adhered.

Description

Technical Field

[0001] This invention specifically relates to a method for preparing an antibacterial and UV-protective fabric, and the antibacterial and UV-protective fabric prepared using this method. Background Technology

[0002] Transfer printing involves first printing dye pigments onto transfer printing paper, and then transferring the dyes from the pattern to the textile through heat treatment during the transfer printing process, where they are fixed to form the pattern. No washing is required after printing, thus no wastewater is generated, and the result is a bright, layered, and exquisitely patterned effect.

[0003] However, most of the functions of transfer-printed fabrics are currently acquired through post-processing, which is inefficient, time-consuming, and can easily damage the original comfort of the fabric. The functions are also too limited and cannot meet the needs of today's market.

[0004] Chinese invention patent CN110172846A discloses a padding solution for wet transfer printing of nylon fabrics and its preparation method. The padding solution for wet transfer printing of nylon fabrics is composed of a paste, a pH slow-release agent, a dispersant, a water-absorbing agent, nano-silver sol, polypropylene glycol, and water. Chinese invention patent CN106223053A discloses a long-lasting antibacterial and UV-resistant polyester fiber fabric and its preparation method, including an antibacterial fabric substrate, a buffer layer, and a hydrophobic layer. The antibacterial fabric substrate is polyester fiber, which is treated with an antibacterial and UV-resistant finishing solution. The hydrophobic layer is a fluoroquaternary ammonium silane coupling agent coating, which is applied to the surface of the antibacterial fabric substrate.

[0005] Chinese invention patent CN112726196A discloses an antibacterial and UV-resistant polyethylene nonwoven fabric and its preparation method. The surface of the polyethylene nonwoven fabric is sequentially adhered with an anti-fouling layer and an antibacterial and UV-resistant layer. The anti-fouling layer is made of dopamine and polyvinylpyrrolidone, and the antibacterial and UV-resistant layer is made of modified silica.

[0006] The aforementioned antibacterial and UV-protective fabrics all possess good antibacterial and UV-protective properties. However, these properties are primarily obtained through antibacterial and UV-protective liquid impregnation treatment, resulting in poor performance stability, short service life, and inefficient manufacturing processes that hinder large-scale production. Summary of the Invention

[0007] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a method for preparing antibacterial and UV-resistant fabrics, which has good performance stability and is suitable for large-scale production.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for preparing an antibacterial and UV-protective fabric includes the following steps:

[0010] Antibacterial spinning solution is used to form antibacterial nanocomposite fibers, which are then coated onto the surface of a base fabric to form an antibacterial layer; the antibacterial spinning solution contains polylactic acid;

[0011] The UV-resistant spinning solution is used to form UV-resistant nanocomposite fibers, which are then coated onto the antibacterial layer to form a UV-resistant layer.

[0012] A transfer paper is placed on the surface of the base fabric, and the pattern on the transfer paper is applied to the surface of the UV-protective layer by hot pressing to form a printed layer, thus obtaining an antibacterial and UV-protective fabric.

[0013] During the hot pressing process, the polylactic acid in the antibacterial layer melts and bonds the base fabric, the antibacterial layer, and the UV-protective layer.

[0014] This application first covers the base fabric with antibacterial and UV protection functions in the form of composite fibers. At the same time, the pattern is covered on the composite fibers by heat transfer, which ensures the effective utilization of functional materials and maintains the breathability of the fabric. Meanwhile, the pattern covering the functional composite fibers can effectively increase the bonding strength between the pattern and the functional layer. Furthermore, the antibacterial spinning solution contains polylactic acid, which can be melted using the temperature of heat transfer, and thus acts as an adhesive layer to increase the bonding strength between the base fabric, the antibacterial layer and the UV protection layer.

[0015] According to some preferred embodiments of the present invention, the polylactic acid in the antibacterial spinning solution accounts for 5-10% by mass.

[0016] According to some preferred embodiments of the present invention, the hot-pressing temperature is 140-170°C, the hot-pressing pressure is 0.5-2.5 MPa, and the hot-pressing time is 5-20 s. In this application, polylactic acid (PLA) with a heat distortion temperature (softening temperature) of 50-80°C and a melting temperature of 160-180°C is used. Under pressure, the hot-pressing temperature is higher than the heat distortion temperature and equal to or lower than the melting temperature of PLA. In this application, the hot-pressing temperature is set to 140-170°C, and the hot-pressing time is controlled by the machine speed to be 5-20 s. This achieves heat transfer while avoiding insufficient melting of PLA resulting in poor adhesion, or excessive melting that blocks fiber gaps and reduces air permeability.

[0017] According to some preferred embodiments of the present invention, the antibacterial spinning solution contains polylactic acid, graphene, dichloromethane, and N,N-dimethylformamide; the volume ratio of dichloromethane to N,N-dimethylformamide is 3-4:1-2, and the mass percentage of graphene in the antibacterial spinning solution is 0.1-2%. Graphene is used for antibacterial purposes, dichloromethane and DMF are used for dissolution, and polylactic acid serves as a green polymer carrier and also has a micro-melting adhesive effect, used for subsequent melting and bonding using the temperature of heat transfer printing.

[0018] According to some preferred embodiments of the present invention, the graphene is a single-layer graphene with a thickness of 0.3-1.2 nm and a diameter of 0.5-5 μm.

[0019] According to some preferred embodiments of the present invention, the UV-protective spinning solution contains polyacrylonitrile, titanium dioxide, and N,N-dimethylformamide; the mass percentage of polyacrylonitrile in the UV-protective spinning solution is 10-15%, and the mass percentage of titanium dioxide is 0.5-2%. Nano-titanium dioxide not only has UV protection effects but can also decompose bacteria under photocatalysis, synergistically with graphene to achieve a composite antibacterial effect.

[0020] According to some preferred embodiments of the present invention, the antibacterial spinning solution is formed into antibacterial nanocomposite fibers by electrospinning, wherein the voltage during electrospinning is 18-22kV, the spinning distance is 15-20cm, and the spinning speed is 1-3mL / h.

[0021] According to some preferred embodiments of the present invention, the UV-protective spinning solution is formed by electrospinning to form UV-protective nanocomposite fibers. The voltage during electrospinning is 10-20kV, the spinning distance is 18-22cm, and the spinning speed is 0.5-2mL / h.

[0022] According to some preferred embodiments of the present invention, the thickness of the antibacterial nanocomposite fiber covering is 0.1-5 mm, and the thickness of the UV-protective nanocomposite fiber covering is 0.1-5 mm; after hot pressing, the total thickness of the antibacterial layer and the UV-protective layer is 0.01-1 mm.

[0023] According to some preferred embodiments of the invention, the base fabric is one or more of polyester fabric, polyester-cotton blended fabric, nylon fabric and cotton fabric.

[0024] The present invention also provides an antibacterial and UV-resistant fabric prepared by the preparation method described above.

[0025] Compared to existing technologies, the advantages of this invention, due to the adoption of the above technical solutions, are as follows: The method for preparing the antibacterial and UV-protective fabric of this invention involves sequentially covering the antibacterial layer and the UV-protective layer onto the surface of the base fabric via electrospinning. A printed layer is then applied to the surface of the UV-protective layer via hot pressing. Simultaneously, the heat of the hot pressing melts the polylactic acid, tightly bonding the UV-protective layer, the antibacterial layer, and the base fabric. The antibacterial and UV-protective fabric prepared by this invention not only possesses excellent antibacterial and UV-protective properties but also exhibits a distinct textured feel, stable structure, and durable performance. Furthermore, the preparation method is highly efficient, requiring only a single transfer and hot pressing process, making it suitable for large-scale production. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic flowchart of the preparation method of antibacterial and UV-resistant fabric in a preferred embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the antibacterial and UV-resistant fabric in a preferred embodiment of the present invention;

[0029] In the attached diagram: 1. Base fabric; 2. Antibacterial roller; 3. Polylactic acid / graphene nanocomposite fiber; 4. Intermediate roller; 5. Polyacrylonitrile / titanium dioxide nanocomposite fiber; 6. UV-protective roller; 7. Printing roller; 8. Transfer paper; 9. Upper hot press roller; 10. Lower hot press roller; 11. Transfer white paper; 12. Collection roller; 13. Water-cooled roller; 14. Antibacterial and UV-protective fabric; 15. Printing layer. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] Unless otherwise specified in the examples, the procedures should be performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0032] Among them, polylactic acid (PLA) LX530 spinning grade (Total, Thailand); anatase nano-titanium dioxide A-100 (Lanxing Tianduohua, Guangxi); polyacrylonitrile 150,000 molecular weight 3291 (Zhongsu, Guangdong); high-purity single-layer graphene (Guosen, Shenzhen); and 100g / m² heat transfer white paper. 2 (Tianying, Guangdong)

[0033] The antibacterial and UV-protective fabric of this embodiment comprises, in sequence, a base fabric, an antibacterial layer, a UV-protective layer, and a printed layer. The base fabric is one or more of polyester fabric, polyester-cotton blended fabric, nylon fabric, and cotton fabric; the antibacterial layer is polylactic acid / graphene nanocomposite fiber; the UV-protective layer is polyacrylonitrile / titanium dioxide nanocomposite fiber; and the printed layer, antibacterial layer, and UV-protective layer are bonded to the surface of the base fabric by heat pressing.

[0034] The method for preparing the antibacterial and UV-protective fabric in this embodiment includes the following steps:

[0035] 1) Preparation of antibacterial spinning solution

[0036] Polylactic acid, graphene, dichloromethane and N,N-dimethylformamide were uniformly mixed, stirred at room temperature for 6 hours, and then ultrasonically vibrated for 3 hours to prepare an antibacterial spinning solution.

[0037] In the antibacterial spinning solution, the volume ratio of dichloromethane to N,N-dimethylformamide is 3-4:1-2, the mass percentage of polylactic acid is 5-10%, and the mass percentage of graphene is 0.1-2%.

[0038] The preferred graphene is single-layer graphene with a thickness of 0.3-1.2 nm and a sheet diameter of 0.5-5 μm.

[0039] 2) Preparation of UV-resistant spinning solution

[0040] Polyacrylonitrile, titanium dioxide, and N,N-dimethylformamide were uniformly mixed and magnetically stirred at room temperature for 36 hours. After defoaming, the mixture was set aside to prepare a UV-resistant spinning solution.

[0041] The mass percentage of polyacrylonitrile in the UV-protective spinning solution is 10-15%, and the mass percentage of titanium dioxide is 0.5-2%.

[0042] 3) Forms an antibacterial layer and a UV-protective layer

[0043] Antibacterial spinning solution is used to form polylactic acid / graphene antibacterial nanocomposite fibers, which are then coated onto the surface of the fabric. The thickness of the antibacterial nanocomposite fiber coating is 0.1-5 mm, forming an antibacterial layer. UV-protective spinning solution is also used to form UV-protective nanocomposite fibers, which are then coated onto the antibacterial layer. The thickness of the UV-protective nanocomposite fiber coating is 0.1-5 mm, forming a UV-protective layer.

[0044] The antibacterial spinning solution is formed into antibacterial nanocomposite fibers by electrospinning. The voltage during electrospinning is 18-22kV, the spinning distance is 15-20cm, and the spinning speed is 1-3mL / h.

[0045] The UV-resistant spinning solution is formed by electrospinning to create polyacrylonitrile / titanium dioxide UV-resistant nanocomposite fibers. The voltage during electrospinning is 10-20kV, the spinning distance is 18-22cm, and the spinning speed is 0.5-2mL / h.

[0046] Preferably, when the base fabric is conveyed to the antibacterial roller and the UV-protective roller, the antibacterial spinning solution and the UV-protective spinning solution are electrospun to form polylactic acid / graphene nanocomposite fibers and polyacrylonitrile / titanium dioxide nanocomposite fibers, respectively, and then sequentially covered on the surface of the base fabric to form the antibacterial layer and the UV-protective layer. The rotation speed of the antibacterial roller and the UV-protective roller is 100-1000 r / min.

[0047] 4) Hot pressing

[0048] Transfer paper is placed on the surface of the fabric, and the pattern on the transfer paper is transferred onto the surface of the UV-protective layer through hot pressing to form a printed layer, resulting in an antibacterial and UV-protective fabric. After hot pressing, the total thickness of the antibacterial and UV-protective layers is 0.01-1 mm. The hot pressing temperature is 140-170℃, the hot pressing pressure is 0.5-2.5 MPa, and the hot pressing time is 5-20 seconds.

[0049] During the hot pressing process, the polylactic acid in the antibacterial layer melts and bonds the fabric, antibacterial layer, and UV protection layer together.

[0050] Preferably, the transfer paper is passed through a hot press roller to cover the surface of the UV protection layer with the printed layer. At the same time, the high temperature of the hot press roller causes the polylactic acid to melt slightly, bonding the textile fabric, antibacterial layer, UV protection layer and printed layer together. Then, it is cooled by a water-cooling roller to finally produce an antibacterial and UV protection fabric.

[0051] Example 1

[0052] The antibacterial and UV-protective fabric in this embodiment has the following structure: Figure 2 As shown, it comprises, in sequence, a base fabric, an antibacterial layer, a UV-protective layer, and a printed layer. The base fabric is polyester fabric, the antibacterial layer is polylactic acid / graphene nanocomposite fiber, and the UV-protective layer is polyacrylonitrile / titanium dioxide nanocomposite fiber.

[0053] like Figure 1 As shown, the preparation method of the antibacterial and UV-protective fabric in this embodiment is as follows: the base fabric passes through an antibacterial roller, and polylactic acid / graphene nanocomposite fibers are electrospun to cover its surface to form an antibacterial layer. Then it passes through an intermediate roller, and then through a UV-protective roller. Polyacrylonitrile / titanium dioxide nanocomposite fibers are electrospun to cover the surface of the antibacterial layer to form a UV-protective layer. The printing roller transports the transfer paper to the middle of the upper and lower hot pressure rollers. The printing layer is covered on the surface of the UV-protective layer by high temperature. The transfer paper is collected by the collection roller. Finally, it is cooled by water cooling roller to produce the antibacterial and UV-protective fabric.

[0054] Specifically, the preparation method of the antibacterial and UV-protective fabric in this embodiment includes the following steps:

[0055] 1) Preparation of antibacterial spinning solution

[0056] Polylactic acid, graphene, dichloromethane and N,N-dimethylformamide were uniformly mixed, magnetically stirred at room temperature for 6 hours, and then ultrasonically vibrated for 3 hours to prepare an antibacterial spinning solution.

[0057] The graphene is a single-layer graphene with a thickness of 0.8 nm and a diameter of 1 μm. The volume ratio of dichloromethane to N,N-dimethylformamide is 7:3, the mass content of polylactic acid is 8%, and the mass content of graphene is 0.1%.

[0058] 2) Preparation of UV-resistant spinning solution

[0059] Polyacrylonitrile, titanium dioxide, and N,N-dimethylformamide were uniformly mixed and magnetically stirred at room temperature for 36 hours. After defoaming, the mixture was set aside to prepare a UV-resistant spinning solution.

[0060] The polyacrylonitrile content is 12% by mass, and the titanium dioxide content is 0.5% by mass.

[0061] 3) Forms an antibacterial layer and a UV-protective layer

[0062] When the textile fabric is fed to the antibacterial roller and the UV-protective roller, the antibacterial spinning solution and the UV-protective spinning solution are electrospun to form polylactic acid / graphene nanocomposite fibers and polyacrylonitrile / titanium dioxide nanocomposite fibers, respectively. These fibers are then sequentially coated onto the surface of the textile fabric to form the antibacterial layer and the UV-protective layer, respectively. The thickness of the polylactic acid / graphene nanocomposite fiber coating is 0.1 mm, and the thickness of the polyacrylonitrile / titanium dioxide nanocomposite fiber coating is 0.1 mm.

[0063] The antibacterial roller rotates at 900 r / min, and the UV-protective roller rotates at 900 r / min. The electrospinning voltage corresponding to the antibacterial spinning solution is 20 kV, the spinning distance is 20 cm, and the spinning speed is 1 mL / h. The electrospinning voltage corresponding to the UV-protective spinning solution is 15 kV, the spinning distance is 20 cm, and the spinning speed is 1 mL / h.

[0064] 4) Hot pressing

[0065] The transfer paper is passed through a hot press roller to coat the surface of the UV-protective layer with a printed layer. Simultaneously, high temperature causes the polylactic acid to slightly melt, bonding the textile fabric, antibacterial layer, UV-protective layer, and printed layer together. The mixture is then cooled by a water-cooling roller, ultimately producing an antibacterial and UV-protective fabric. The total thickness of the antibacterial and UV-protective layers after hot pressing is 0.15 mm. The operating temperature of the hot press roller is 165℃, the hot pressing pressure is 1.5 MPa, and the hot pressing time is 10 seconds.

[0066] Example 2

[0067] The difference between this embodiment and Embodiment 1 is that in this embodiment, the rotation speed of the antibacterial roller is 450 r / min, and the rotation speed of the UV-protective roller is 900 r / min. The thickness of the antibacterial nanocomposite fiber coating is 0.2 mm, the thickness of the UV-protective nanocomposite fiber coating is 0.1 mm, and the total thickness of the antibacterial layer and the UV-protective layer after hot pressing is 0.23 mm. The remaining steps and parameters are basically the same as in Embodiment 1.

[0068] Example 3

[0069] The difference between this embodiment and Embodiment 1 is as follows: In this embodiment, the rotation speed of the antibacterial roller is 900 r / min, the rotation speed of the UV-protective roller is 450 r / min, the thickness of the antibacterial nanocomposite fiber coating is 0.1 mm, the thickness of the UV-protective nanocomposite fiber coating is 0.2 mm, and the total thickness of the antibacterial layer and the UV-protective layer after hot pressing is 0.23 mm. The remaining steps and parameters are basically the same as in Embodiment 1.

[0070] Comparative Example 1

[0071] The difference between this comparative example and Example 1 is that the UV protection layer in this comparative example is replaced by an antibacterial layer, while the remaining steps and parameters are basically the same as in Example 1.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 1 is that the antibacterial layer in this comparative example is replaced by an ultraviolet-resistant layer, while the remaining steps and parameters are basically the same as in Example 1.

[0074] Comparative Example 3

[0075] The difference between this comparative example and Example 1 is that in this comparative example, a low-melting-point polyurethane with a melting temperature of 120°C is used instead of polylactic acid in the antibacterial spinning solution used to prepare the antibacterial layer. The remaining steps and parameters are basically the same as in Example 1.

[0076] Comparative Example 4

[0077] The difference between this comparative example and Example 1 is that the temperature during hot pressing in this comparative example is 100°C, while the remaining steps and parameters are basically the same as in Example 1.

[0078] Performance testing

[0079] The fabrics prepared in Examples 1-3 and Comparative Examples 1-2 were tested for antibacterial properties (GB / T20944.2-2007), UV protection properties (GB / T 18830-2009), and air permeability (GB / T5453-1997 "Determination of air permeability of fabrics" and GB / T 3923.21-2013 "Test methods for textiles - Part 21: Test methods for mechanical properties of fabrics - Determination of interfacial bond strength"). The test results are shown in Table 1.

[0080] Table 1 Test Results

[0081]

[0082] Table 1 shows that the antibacterial and UV-protective fabric prepared in the examples has excellent performance, breathability, and adhesion. Polylactic acid was chosen because its melting temperature is close to that of heat transfer printing. If it were replaced with low-melting-point polyurethane (Comparative Example 3) with a melting temperature of 120°C, the polyurethane nanofibers would have completely melted by the time heat transfer printing was completed, blocking the fiber gaps and resulting in poor fabric breathability. Furthermore, when the hot-pressing temperature was insufficient (Comparative Example 4), heat transfer could not be achieved, and the inability of polylactic acid to melt effectively led to poor adhesion between fabric layers.

[0083] The antibacterial and UV-protective fabric of this invention uses textile fabric as the base material, polylactic acid / graphene nanocomposite fibers as the antibacterial layer, and polyacrylonitrile / titanium dioxide nanocomposite fibers as the UV-protective layer. The antibacterial and UV-protective layers are sequentially applied to the surface of the textile fabric using electrospinning. Then, a printing layer is applied to the surface of the UV-protective layer via hot pressing, thus producing the antibacterial and UV-protective fabric. Due to the use of polylactic acid / graphene nanocomposite fibers and polyacrylonitrile / titanium dioxide nanocomposite fibers, the antibacterial and UV-protective fabric not only possesses excellent antibacterial and UV-protective properties but also exhibits long-lasting and stable performance. Furthermore, the thickness of the antibacterial and UV-protective layers can be controlled by adjusting the number of nozzles corresponding to the antibacterial and UV-protective spinning solutions, enabling applications in various situations. The high temperature of hot pressing causes slight melting of the polylactic acid, which tightly bonds the printing layer, UV-protective layer, antibacterial layer, and textile fabric, resulting in a stable structure and long service life. Moreover, the use of nanocomposite fibers does not affect the fabric's breathability and comfort. The preparation method of the antibacterial and UV-protective fabric is also highly efficient and suitable for large-scale production.

[0084] The method for preparing antibacterial and UV-protective fabric of the present invention involves sequentially covering the antibacterial layer and the UV-protective layer onto the surface of a base fabric via electrospinning, and then covering the surface of the UV-protective layer with a printed layer via hot pressing. This method offers the following advantages: the antibacterial and UV-protective functions are covered onto the base fabric in the form of composite fibers; the nanofibers are relatively thin and do not affect breathability; the pattern is covered onto the functional composite fibers, which have a large specific surface area and a rough surface, resulting in stronger adhesion and effectively increasing the bonding strength between the pattern and the functional layer, making it less prone to peeling off and providing more durable performance compared to printing directly onto the base fabric; the rough surface formed by the nanofibers provides a textured feel; and the heat of hot pressing melts the polylactic acid, tightly bonding the UV-protective layer, antibacterial layer, and base fabric. The antibacterial and UV-protective fabric prepared by this invention not only possesses excellent antibacterial and UV-protective properties but also exhibits a distinct textured feel, stable structure, and durable performance. Furthermore, the preparation method is highly efficient, requiring only a single transfer and hot pressing process, making it suitable for large-scale production.

[0085] For ease of description and understanding, the above steps are described separately with numbered labels, but this is not intended to limit their meaning. In practice, at least some of the above steps can be performed simultaneously or in any order. The endpoints and values ​​of the ranges disclosed herein are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, endpoint values ​​of various ranges, endpoint values ​​of various ranges and individual point values, and individual point values ​​can be combined to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. The equipment and raw materials used are all commercially available or commonly used in the art. Unless otherwise specified, the methods in the above embodiments are conventional methods in the art. Raw materials not specifically mentioned in the embodiments are all commercially available. Operations without a specific temperature are performed at room temperature. Operating methods and conditions not specifically mentioned can employ well-known or conventional means and conditions in the art.

[0086] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing an antibacterial and UV-protective fabric, characterized in that, Includes the following steps: Antibacterial spinning solution is used to form antibacterial nanocomposite fibers, which are then coated onto the surface of a base fabric to form an antibacterial layer; the antibacterial spinning solution contains polylactic acid; The UV-resistant spinning solution is used to form UV-resistant nanocomposite fibers, which are then coated onto the antibacterial layer to form a UV-resistant layer. A transfer paper is placed on the surface of the base fabric, and the pattern on the transfer paper is applied to the surface of the UV-protective layer by hot pressing to form a printed layer, thus obtaining an antibacterial and UV-protective fabric. During the hot pressing process, the polylactic acid in the antibacterial layer melts and bonds the base fabric, the antibacterial layer, and the UV-protective layer. The hot-pressing temperature is 140-170℃, the hot-pressing pressure is 0.5-2.5MPa, and the hot-pressing time is 5-20s; the mass percentage of polylactic acid in the antibacterial spinning solution is 5-10%. The antibacterial spinning solution contains polylactic acid, graphene, dichloromethane, and N,N-dimethylformamide; The volume ratio of dichloromethane to N,N-dimethylformamide is 3-4:1-2, and the mass percentage of graphene in the antibacterial spinning solution is 0.1-2%; the graphene is single-layer graphene with a thickness of 0.3-1.2 nm and a diameter of 0.5-5 μm. The UV-protective spinning solution contains polyacrylonitrile, titanium dioxide, and N,N-dimethylformamide; the mass percentage of polyacrylonitrile in the UV-protective spinning solution is 10-15%, and the mass percentage of titanium dioxide is 0.5-2%; the antibacterial spinning solution is formed into antibacterial nanocomposite fibers by electrospinning, with a voltage of 18-22kV, a spinning distance of 15-20cm, and a spinning speed of 1-3mL / h. The UV-resistant spinning solution is formed by electrospinning to form UV-resistant nanocomposite fibers. The voltage during electrospinning is 10-20kV, the spinning distance is 18-22cm, and the spinning speed is 0.5-2mL / h. The thickness of the antibacterial nanocomposite fiber covering is 0.1-5mm, and the thickness of the UV-protective nanocomposite fiber covering is 0.1-5mm; after hot pressing, the total thickness of the antibacterial layer and the UV-protective layer is 0.01-1mm.

2. An antibacterial and UV-resistant fabric prepared by the preparation method described in claim 1.

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