Antibacterial cool polylactic acid fiber fabric as well as preparation method and application thereof

Abstract

The invention discloses an antibacterial cool polylactic acid fiber fabric as well as a preparation method and application thereof, and belongs to the technical field of antibacterial cool polylactic acid fiber fabrics as well as preparation methods and application thereof. The fabric is formed by compounding a first cool sense layer and a second antibacterial layer, the first cool sense layer is made of cool sense polylactic acid fiber cloth, and the second antibacterial layer is made of antibacterial polylactic acid fiber / polyester fiber mixed woven cloth; the cool polylactic acid fiber has remarkable breathable and cool functions, also has intrinsic antibacterial and bacteriostatic functions, and can effectively inhibit the breeding of fungi and bacteria and deodorize. The antibacterial polylactic acid fiber / polyester fiber hybrid fabric has excellent antibacterial and bacteriostatic effects and mechanical properties. The fabric is simple and practical in structure, the antibacterial and heat dissipation effects of the polylactic acid fibers are effectively improved through cooperative use of the fibers, the mechanical property is high, the use requirements of daily life are met, the preparation method is simple and environmentally friendly, and large-scale production is easy.

Description

Technical Field

[0001] The invention belongs to the technical field of polylactic acid fiber textiles, and particularly relates to an antibacterial cool polylactic acid fiber fabric, a preparation method thereof, and applications thereof. Background Art

[0002] With the increasing global demand for environmental protection and sustainable development, the development and application of biodegradable materials have received more and more attention. As a material with good biocompatibility and biodegradability, polylactic acid fiber has shown broad application potential in many fields, including medical, packaging and textiles. Although polylactic acid fiber has achieved certain market applications due to its environmentally friendly characteristics, it still faces many challenges in actual use. First of all, polylactic acid fiber has poor moisture and thermal conductivity, which has become a limiting factor in some commercial and industrial applications. This poor moisture and thermal conductivity is not conducive to its application in the textile field; at the same time, although polylactic acid fiber has natural antibacterial ability, its broad-spectrum antibacterial performance is still insufficient when facing complex microbial environments.

[0003] With the continuous development of the times, people's requirements for textiles are no longer limited to warmth and comfort, but have put forward more requirements. However, existing polylactic acid fibers used in textile fabrics still have problems such as insufficient antibacterial properties and inability to adapt to ambient temperature, resulting in poor user comfort. Therefore, there is an urgent need for antibacterial and cooling polylactic acid fiber fabrics to improve their antibacterial and cooling properties. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an antibacterial and cool-feeling polylactic acid fiber fabric to solve the problem of poor antibacterial and cool-feeling properties of polylactic acid fiber fabrics in the prior art;

[0005] The second object of the present invention is to provide a method for preparing the above-mentioned antibacterial cool polylactic acid fiber fabric;

[0006] A third object of the present invention is to provide an application of an antibacterial cool feeling polylactic acid fiber fabric.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] In a first aspect, the present invention provides an antibacterial cool polylactic acid fiber fabric, wherein the fabric is composited by a first cool layer and a second antibacterial layer;

[0009] The first cooling layer comprises cooling polylactic acid fiber fabric;

[0010] The second antibacterial layer comprises an antibacterial polylactic acid fiber / polyester fiber blended fabric; the antibacterial polylactic acid fiber / polyester fiber blended fabric is formed by interweaving antibacterial polylactic acid fiber and polyester fiber.

[0011] Furthermore, the preparation method of the cool polylactic acid fiber fabric comprises the following steps:

[0012] Step A1: adding the silane coupling agent dispersion to the cooling particles, stirring and mixing evenly to obtain modified cooling particles;

[0013] Step A2: mixing the polylactic acid slices with the modified cooling particles, and then extruding and granulating them to obtain a polylactic acid cooling masterbatch;

[0014] Step A3: melt-spinning the polylactic acid cooling masterbatch to obtain cooling polylactic acid fibers; and weaving the cooling polylactic acid fiber fabric.

[0015] Furthermore, in step A1, the mass ratio of the cooling particles to the silane coupling agent is 10 to 50:1.

[0016] Furthermore, in step A1, the silane coupling agent includes KH-550, KH-560, and KH-570; the cooling particles include one or more of jade powder, biotite powder, muscovite powder, phlogopite powder, lepidolite powder, and sericite powder, with a particle size of ≤0.1 mm.

[0017] Furthermore, in step A2, the mass ratio of the modified cooling particles to the polylactic acid is 0.1 to 0.5:1.

[0018] Furthermore, in step A2, the blending extrusion is performed using a twin-screw extruder with a temperature range of 170-200° C. and a screw speed of 100-160 r / min.

[0019] Furthermore, in step A3, the drawing speed of the melt spinning process is 300-500 r / min, and the spinning temperature is 180-190°C.

[0020] Furthermore, the preparation method of the antibacterial polylactic acid fiber / polyester fiber blended fabric comprises the following steps:

[0021] Step B1: adding polylactic acid into dichloromethane and dissolving and mixing uniformly to obtain a polylactic acid solution;

[0022] Step B2: adding nano-cuprous oxide to the polylactic acid solution and dispersing the mixture by ultrasonication to obtain a mixed solution;

[0023] Step B3: After the solvent in the mixed solution is evaporated, the mixed solution is sequentially subjected to extrusion granulation and melt spinning to obtain antibacterial polylactic acid fibers;

[0024] Step B4: interweaving the polyester fiber and the antibacterial polylactic acid fiber to obtain an antibacterial polylactic acid fiber / polyester fiber blended fabric.

[0025] Furthermore, in step B1, the mass ratio of the polylactic acid to dichloromethane is 1:10-50.

[0026] Furthermore, the mass ratio of the polylactic acid to nano-cuprous oxide is 1:0.005-0.01.

[0027] Furthermore, in step B2, the power of the ultrasonic dispersion treatment is 50-100 W, and the ultrasonic time is 5-10 h.

[0028] Furthermore, in step B3, the mixed solution is evaporated in an oven at 50°C.

[0029] Furthermore, in step B3, the extrusion granulation is performed using a twin-screw extruder, the twin-screw temperature range is 170-200° C., and the screw speed is 100-150 r / min.

[0030] Furthermore, in step B3, the drawing speed of the melt spinning process is 100-500 r / min, and the spinning temperature is 180-200°C.

[0031] Furthermore, in step B4, the blending ratio of the polyester fiber to the antibacterial polylactic acid fiber is 30:70.

[0032] In a second aspect, the present invention provides a method for preparing an antibacterial cool-feeling polylactic acid fiber fabric, comprising the following steps:

[0033] The first cool feeling layer as the bottom layer and the second antibacterial layer as the surface layer are quilted and sewn together to obtain an antibacterial cool feeling polylactic acid fiber fabric.

[0034] In a third aspect, the present invention provides an application of an antibacterial cool polylactic acid fiber fabric in antibacterial textiles.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention provides an antibacterial, cooling polylactic acid fiber fabric, comprising a first cooling layer and a second antibacterial layer, wherein the first cooling layer is a cooling polylactic acid fiber fabric, and the second antibacterial layer is an antibacterial polylactic acid fiber / polyester fiber blended fabric. The cooling polylactic acid fiber is a mineral cooling fiber with significant breathability and cooling properties, and also possesses intrinsic antibacterial and antifungal properties, effectively inhibiting the growth of fungi and bacteria and deodorizing. The antibacterial polylactic acid fiber / polyester fiber blended fabric is prepared by melt-spinning antibacterial particles and polylactic acid chips to produce the antibacterial polylactic acid fiber, then blending and twisting the polyester fiber with the antibacterial polylactic acid fiber, and finally weaving the blended fabric. The antibacterial polylactic acid fiber exhibits excellent antibacterial and antibacterial properties, while the polyester fiber exhibits good elasticity and strength, as well as moisture absorption and air conduction properties. The fabric has a simple and practical structure, and through the coordinated use of the fibers, it effectively enhances the antibacterial and heat dissipation properties of the polylactic acid fiber, resulting in high mechanical properties that meet the needs of daily use. Furthermore, the preparation method is simple, environmentally friendly, and amenable to large-scale production.

[0037] 2. The first cooling layer of the present invention is a cooling polylactic acid fiber fabric. The cooling particles in the fabric are all selected to have a particle size of less than 0.1 mm and are surface-modified and evenly dispersed in the polylactic acid mass. Since the modified cooling particles are added during the fiber production process, the cooling particles are evenly dispersed on the surface and interior of the fiber. At the same time, the grooves extending on the fiber surface give the fiber excellent thermal conductivity, thereby quickly conducting heat away from the human body. In addition, the efficient thermal conductivity of the polylactic acid fiber with the modified cooling particles creates a cool sensation when the human skin comes into contact with the fabric, giving the wearer a refreshing and comfortable experience. At the same time, it has antibacterial and skin-friendly functions and is completely biodegradable, making it an ideal functional and environmentally friendly fiber. The fiber has good mechanical properties; the mica nanopowder and jade powder used are safe and environmentally friendly, with no precipitation; and the cooling efficiency remains stable after multiple washings.

[0038] 3. The second antimicrobial layer in this invention is an antimicrobial polylactic acid fiber / polyester fiber blend fabric. Contact-type intense ultrasonic dispersion technology is used to enhance the interfacial interaction between nanocuprous oxide and polylactic acid. Furthermore, the polylactic acid fibers are produced through twin-screw extrusion granulation and melt spinning. Specifically, utilizing similar compatibility, polylactic acid is swollen in an organic solvent, causing the polylactic acid molecular chains to open up. Contact-type intense ultrasonic dispersion technology is then used to disperse the nanocuprous oxide into the polylactic acid solution. Because cuprous ions and carbonyl groups in polylactic acid can crosslink through coordination bonds, the nanocuprous oxide is well dispersed within the polylactic acid matrix. Polylactic acid fiber masterbatch is produced through extrusion molding in a twin-screw granulator and slicing and granulation, and then continuously processed through a melt spinning machine to produce polylactic acid fibers. Polyester fibers have excellent strength and elasticity, as well as moisture absorption, breathability, and quick drying properties. Their structure is simple and practical. The coordinated use of the fibers effectively enhances the heat dissipation and antimicrobial properties of the fabric, ensuring it meets the requirements of clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] Figure 1 It is a structural schematic diagram of an antibacterial cool-feeling polylactic acid fiber fabric of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Obviously, the following descriptions are merely some examples or embodiments of the present application. Those skilled in the art can apply the present application to other similar scenarios without inventive effort. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in the present application, changes in design, manufacturing, or production based on the technical content disclosed in the present application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in the present application.

[0043] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or repeated descriptions of substantially identical structures may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Furthermore, the following description is provided to enable those skilled in the art to fully understand this application and is not intended to limit the subject matter recited in the claims.

[0044] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0045] Example 1

[0046] This embodiment provides a method for preparing a cooling polylactic acid fiber fabric as a first cooling layer, comprising the following steps:

[0047] Step A1: Acetic acid was added dropwise to a 75% volume concentration ethanol / water solution until the pH value of the solution reached 4.5, KH-550 was added, and the mixture was stirred for 2 hours until it was completely hydrolyzed. Cooling particles with an average particle size of ≤0.1 mm composed of jade powder, muscovite powder, and phlogopite powder were added, and the mixture was stirred at a high speed of 1000 rpm for 2 hours, wherein the mass ratio of KH-550 to the cooling particles was 1:20; after aging and drying, the modified cooling particles were obtained;

[0048] Step A2: The polylactic acid chips and the modified cooling particles are mixed and stirred in a mass ratio of 1:0.3, and the mixture is extruded and granulated through a twin-screw extruder at a temperature of 180° C. and a screw speed of 150 r / min to obtain a polylactic acid cooling masterbatch;

[0049] Step A3: melt-spinning the polylactic acid cooling masterbatch at a spinning temperature of 180° C. and a drawing speed of 500 r / min. The obtained cooling polylactic acid fibers are woven into cooling polylactic acid fiber fabrics.

[0050] Example 2

[0051] This embodiment provides a method for preparing a cooling polylactic acid fiber fabric as a first cooling layer. The method differs from that of Example 1 in that, in step A2, the mass ratio of the polylactic acid slices to the modified cooling particles is 1:0.1, and the remaining steps and parameters remain the same.

[0052] Example 3

[0053] This embodiment provides a method for preparing a cooling polylactic acid fiber fabric as a first cooling layer. The method differs from that of Example 1 in that, in step A2, the mass ratio of the polylactic acid slices to the modified cooling particles is 1:0.5, and the remaining steps and parameters remain the same.

[0054] Example 4

[0055] This embodiment provides a method for preparing an antibacterial polylactic acid fiber / polyester fiber blended fabric as a second antibacterial layer, comprising the following steps:

[0056] Step B1: dissolving and mixing polylactic acid and dichloromethane in a mass ratio of 1:30 to obtain a polylactic acid solution;

[0057] Step B2: adding nano-cuprous oxide to the polylactic acid solution, wherein the mass ratio of nano-cuprous oxide to polylactic acid is 0.008:1, and dispersing by ultrasonication at a power of 50 W for 8 h to obtain a mixed solution;

[0058] Step B3: The mixed solution was placed in an oven at 50°C to evaporate the solvent, and the obtained mixture was blended and extruded into granules through a twin-screw extruder at a temperature of 180°C and a screw speed of 200 r / min; and then melt-spinned at a spinning temperature of 180°C and a drawing speed of 200 r / min to obtain antibacterial polylactic acid fiber;

[0059] Step B4: The polyester fiber and the antibacterial polylactic acid fiber are interwoven with each other in a blending ratio of 30:70 to obtain an antibacterial polylactic acid fiber / polyester fiber blended fabric.

[0060] Example 5

[0061] This embodiment provides a method for preparing an antibacterial polylactic acid fiber / polyester fiber blended fabric as a second antibacterial layer. The method differs from Example 4 in that, in step B2, the mass ratio of nano-cuprous oxide to polylactic acid is 0.005:1, and the remaining steps and parameters remain the same.

[0062] Example 6

[0063] This embodiment provides a method for preparing an antibacterial polylactic acid fiber / polyester fiber blended fabric as a second antibacterial layer. The method differs from Example 4 in that, in step B2, the mass ratio of nano-cuprous oxide to polylactic acid is 0.01:1, and the remaining steps and parameters remain the same.

[0064] Example 7

[0065] See also Figure 1 The fabric structure shown in the figure is an antibacterial cool polylactic acid fiber fabric, which is made by quilting and stitching a first cool layer as a bottom layer and a second antibacterial layer as a surface layer; wherein:

[0066] The first cooling layer is the cooling polylactic acid fiber fabric prepared in Example 1;

[0067] The second antibacterial layer is the antibacterial polylactic acid fiber / polyester fiber blended fabric prepared in Example 4.

[0068] Example 8

[0069] An antibacterial cool polylactic acid fiber fabric is prepared by quilting and stitching a first cool layer as a bottom layer and a second antibacterial layer as a surface layer; wherein:

[0070] The first cooling layer is the cooling polylactic acid fiber fabric prepared in Example 2;

[0071] The second antibacterial layer is the antibacterial polylactic acid fiber / polyester fiber blended fabric prepared in Example 5.

[0072] Example 9

[0073] An antibacterial cool polylactic acid fiber fabric is prepared by quilting and stitching a first cool layer as a bottom layer and a second antibacterial layer as a surface layer; wherein:

[0074] The first cooling layer is the cooling polylactic acid fiber fabric prepared in Example 3;

[0075] The second antibacterial layer is the antibacterial polylactic acid fiber / polyester fiber blended fabric prepared in Example 6.

[0076] Comparative Example 1

[0077] This comparative example provides a method for preparing a polylactic acid fiber cloth, comprising the following steps:

[0078] Step 1: Stir the polylactic acid slices evenly, and then blend and extrude them into pellets through a twin-screw extruder. The temperature range of the twin-screw extruder is 180°C and the screw speed is 150r / min to obtain polylactic acid masterbatch;

[0079] Step 2: melt-spinning the polylactic acid masterbatch at a temperature of 180° C. and a drafting speed of 500 r / min. The obtained polylactic acid fibers are woven to obtain polylactic acid fiber fabric.

[0080] Comparative Example 2

[0081] This comparative example provides a method for preparing a polylactic acid fiber / polyester fiber blended fabric, comprising the following steps:

[0082] Step 1: Stir the polylactic acid slices evenly, and then blend and extrude them into pellets through a twin-screw extruder. The temperature range of the twin-screw extruder is 180°C and the screw speed is 150r / min to obtain polylactic acid masterbatch;

[0083] Step 2: melt spinning the polylactic acid masterbatch at a temperature of 180°C and a drafting speed of 500 r / min to obtain polylactic acid fiber;

[0084] Step 3: Step B4: Polyester fiber and polylactic acid fiber are interwoven with each other in a blending ratio of 30:70 to obtain a polylactic acid fiber / polyester fiber blended fabric.

[0085] Comparative Example 3

[0086] This preparation example provides a method for preparing an antibacterial polylactic acid fiber fabric as a second antibacterial layer, comprising the following steps:

[0087] Step B1: dissolving and mixing polylactic acid and dichloromethane in a mass ratio of 1:30 to obtain a polylactic acid solution;

[0088] Step B2: adding nano-cuprous oxide to the polylactic acid solution, wherein the mass ratio of nano-cuprous oxide to polylactic acid is 0.008:1, and dispersing by ultrasonication at a power of 50 W for 8 h to obtain a mixed solution;

[0089] Step B3: The mixed solution is placed in an oven at 50°C to evaporate the solvent, and the resulting mixture is blended and extruded into granules through a twin-screw extruder, the temperature range of the twin-screw extruder is 180°C, and the screw speed is 200 r / min; then the mixture is melt-spun, the temperature during the spinning process is 180°C, and the drawing speed is 200 r / min. The obtained antibacterial polylactic acid fiber is woven to obtain antibacterial polylactic acid fiber fabric.

[0090] Comparative Example 4

[0091] A polylactic acid fiber fabric is prepared by quilting and sewing a first fabric layer as a bottom layer and a second fabric layer as a surface layer; wherein:

[0092] The first fabric layer and the second fabric layer are both made of the polylactic acid fiber fabric prepared in Comparative Example 1.

[0093] Comparative Example 5

[0094] A polylactic acid fiber fabric is prepared by quilting and sewing a first fabric layer as a bottom layer and a second fabric layer as a surface layer; wherein:

[0095] The first fabric layer is the polylactic acid fiber fabric prepared in Comparative Example 1;

[0096] The second fabric layer is the polylactic acid fiber / polyester fiber blended fabric prepared in Comparative Example 2.

[0097] Comparative Example 6

[0098] A polylactic acid fiber fabric, which is different from Example 7 in that the first cooling layer is the polylactic acid fiber fabric prepared in Comparative Example 1.

[0099] Comparative Example 7

[0100] A polylactic acid fiber fabric, which differs from Example 7 in that the second antibacterial layer is the polylactic acid fiber / polyester fiber blended fabric prepared in Comparative Example 2.

[0101] Comparative Example 8

[0102] A polylactic acid fiber fabric, which differs from Example 7 in that the second antibacterial layer is the antibacterial polylactic acid fiber fabric prepared in Comparative Example 3.

[0103] Performance testing:

[0104] (1) Cooling performance test: The polylactic acid fiber fabrics prepared in Examples 7 to 9 and Comparative Examples 4 to 8 were cut into pieces with a size of 200 mm × 200 mm, and conditioned in a constant temperature and humidity chamber for 24 h according to GB / T6529-2008 "Standard atmospheric pressure for humidity conditioning and testing of textiles". The contact cooling coefficient q of the fabrics was then tested using a KES-F7 contact cooling and heating tester. max The test method follows GB / T35263-2017 "Test and evaluation of the instantaneous cooling properties of textiles". The sample platform temperature is 20.0 (±0.5), the heat detection plate temperature is 35.0 (±0.5), and the temperature difference with the sample platform is 15°C. Five positions are selected for testing each sample, and the average value is taken.

[0105] The test results are shown in Table 1.

[0106] Table 1

[0107]

[0108]

[0109] As can be seen from Table 1, the addition of cooling particles can significantly increase the contact coolness coefficient of the fabric. This is because cooling particles generally have a high thermal conductivity coefficient. The cooling particles form a good thermal conductivity pathway in the polylactic acid. These materials can quickly conduct heat, thereby accelerating the heat exchange rate between the skin and the fabric, making the human body feel cool. At the same time, cooling particles often also have good hygroscopicity, able to absorb and quickly release water. When the polylactic acid fiber absorbs sweat, these particles can quickly evaporate the water, carrying away the heat, thereby keeping the skin surface dry and cool. This moisture absorption and perspiration function makes the cooling effect more lasting and significant.

[0110] (2) Antibacterial performance test: The antibacterial performance of the polylactic acid fiber fabrics prepared in Examples 7 to 9 and Comparative Examples 4 to 8 against Staphylococcus aureus and Escherichia coli was tested. The antibacterial experiment selected two representative Gram-negative and Gram-positive bacteria (Staphylococcus aureus, S.aureus and Escherichia coli, E.coli) to verify the antibacterial performance of the antibacterial cool polylactic acid fiber fabric. In order to facilitate the operation of the antibacterial experiment, the antibacterial cool polylactic acid fiber fabric was cut into sheets before the test. According to "GB / T 20944.3-2008 Evaluation of antibacterial properties of textiles Part 3: Oscillation method", the antibacterial cool polylactic acid fiber fabric samples were cut into pieces and placed in a flask, and then 70 ml of phosphate buffer solution (PBS, pH ≈ 7.2) and 5 ml of bacterial solution (3×10 5 ~4×10 5cfu / ml), and then the flask was shaken at 24°C for 18 h; 1 ml of the culture solution was taken out, diluted, and evenly dispersed on the agar plate, and incubated at 37°C for 36 h. The number of grown colonies was counted and the inhibition rate was calculated by the formula.

[0111] The test results are shown in Table 2.

[0112] Table 2

[0113]

[0114]

[0115] As shown in Table 2, pure PLA fabric exhibits some antibacterial properties against Staphylococcus aureus and Escherichia coli, but the results are far from ideal. Antibacterial cool PLA fabric exhibits antibacterial effects of 97.95% and 92.38% against Staphylococcus aureus and Escherichia coli, respectively. After 30 washes, the inhibition rates are 91.63% and 88.09%, respectively. This indicates that PLA fabric exhibits significantly greater antibacterial activity against Staphylococcus aureus than Escherichia coli, with a long-lasting antibacterial effect. This is due to the ability of cuprous oxide nanoparticles to adsorb onto bacterial cell walls, disrupting them and the cell membrane, leading to bacterial death. This disruption prevents the bacteria from maintaining normal physiological functions, ultimately leading to their death. Cuprous oxide reacts with key compounds in bacteria, such as sulfhydryl groups and disulfide bonds, to form corresponding thiol-copper compounds. These reactions interfere with normal bacterial biochemical reactions, affecting their physiological activities and even inducing apoptosis. When cuprous oxide comes into contact with bacteria, it catalyzes the production of large amounts of reactive oxygen species (ROS), which directly damage bacterial cellular components, killing them. The cuprous ions released by cuprous oxide are highly toxic and can bind to bacterial enzymes, inactivating them and hindering bacterial metabolism and energy production, ultimately leading to bacterial death. Cuprous oxide inhibits Staphylococcus aureus and Escherichia coli through multiple mechanisms, including disruption of cell structure, interference with biochemical reactions, production of reactive oxygen species, and the direct toxic effects of copper ions. These mechanisms work together to make cuprous oxide an excellent antibacterial agent.

[0116] In summary, the antibacterial and cool polylactic acid fabric prepared by the present invention has both excellent mechanical strength and good thermal and moisture conductivity. The fabric is soft and comfortable, has good air permeability, can be used and stored for a long time, and has great application value in the field of fiber textiles.

[0117] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0118] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An antibacterial cool feeling polylactic acid fiber fabric, characterized in that: The fabric is composed of a first cooling layer and a second antibacterial layer; The first cooling layer comprises cooling polylactic acid fiber fabric; The second antibacterial layer comprises an antibacterial polylactic acid fiber / polyester fiber blended fabric; the antibacterial polylactic acid fiber / polyester fiber blended fabric is formed by interweaving antibacterial polylactic acid fiber and polyester fiber.

2. The antibacterial cool feeling polylactic acid fiber fabric according to claim 1, characterized in that: The preparation method of the cool polylactic acid fiber cloth comprises the following steps: Step A1: adding the silane coupling agent dispersion to the cooling particles, stirring and mixing evenly to obtain modified cooling particles; Step A2: mixing the polylactic acid slices with the modified cooling particles, and then extruding and granulating them to obtain a polylactic acid cooling masterbatch; Step A3: melt-spinning the polylactic acid cooling masterbatch to obtain cooling polylactic acid fibers; and weaving the cooling polylactic acid fiber fabric.

3. The antibacterial cool polylactic acid fiber fabric according to claim 2, characterized in that: In step A1, the mass ratio of the cooling particles to the silane coupling agent is 10 to 50:

1.

4. The antibacterial cool polylactic acid fiber fabric according to claim 2, characterized in that: In step A2, the mass ratio of the modified cooling particles to the polylactic acid is 0.1 to 0.5:

1.

5. The antibacterial cool feeling polylactic acid fiber fabric according to claim 1, characterized in that: The method for preparing the antibacterial polylactic acid fiber / polyester fiber mixed fabric comprises the following steps: Step B1: adding polylactic acid into dichloromethane and dissolving and mixing uniformly to obtain a polylactic acid solution; Step B2: adding nano-cuprous oxide to the polylactic acid solution and dispersing the mixture by ultrasonication to obtain a mixed solution; Step B3: After the solvent in the mixed solution is evaporated, the mixed solution is sequentially subjected to extrusion granulation and melt spinning to obtain antibacterial polylactic acid fibers; Step B4: interweaving the polyester fiber and the antibacterial polylactic acid fiber to obtain an antibacterial polylactic acid fiber / polyester fiber blended fabric.

6. The antibacterial cool feeling polylactic acid fiber fabric according to claim 5, characterized in that: The mass ratio of the polylactic acid to the nano-cuprous oxide is 1:0.005-0.

01.

7. The antibacterial cool polylactic acid fiber fabric according to claim 5, characterized in that: In step B2, the power of the ultrasonic dispersion treatment is 50-100 W, and the ultrasonic time is 5-10 h.

8. The antibacterial cool feeling polylactic acid fiber fabric according to claim 5, characterized in that: In step B4, the blending ratio of the polyester fiber to the antibacterial polylactic acid fiber is 30:

70.

9. A method for preparing the antibacterial cool feeling polylactic acid fiber fabric according to claim 1, characterized in that: The following steps are involved: The first cool feeling layer as the bottom layer and the second antibacterial layer as the surface layer are quilted and sewn together to obtain an antibacterial cool feeling polylactic acid fiber fabric.

10. Use of the antibacterial cool polylactic acid fiber fabric according to claim 1 in antibacterial textiles.

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