Antibacterial wear-resistant carpet fabric and preparation method thereof

Abstract

The invention relates to an antibacterial wear-resistant carpet fabric and a preparation method thereof, and belongs to the technical field of textile materials, the antibacterial wear-resistant carpet fabric comprises a surface antibacterial area, a middle wear-resistant area and a bottom layer supporting area which are sequentially stacked from top to bottom; the surface antibacterial area is formed by weaving functional fibers which are prepared by mixing a photosensitizer-loaded covalent organic framework material and polyamide and then carrying out melt spinning; the middle wear-resistant area is formed by weaving mixed fibers of the functional fibers and fibers embedded with self-repairing microcapsules; the self-repairing microcapsule comprises a wall material and a core material arranged in the wall material, the wall material is polyurethane or melamine resin, and the core material comprises a repairing monomer and a catalyst; the photodynamic antibacterial system of the surface layer and the self-repairing system of the middle layer work cooperatively, so that the sanitary level of the carpet is improved, the service life of the carpet is prolonged, and the problem that the carpet is difficult to consider in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of textile materials technology, specifically referring to an antibacterial and wear-resistant carpet fabric and its preparation method. Background Technology

[0002] Carpets, as a common floor covering material, are widely used in homes, hotels, hospitals, and public places. However, traditional carpets face two major challenges: Antibacterial and anti-mildew issues: Carpet fibers easily absorb and accumulate moisture, dander, dust, etc., becoming a breeding ground for bacteria and mold. Current technologies mostly use the addition of silver ions, quaternary ammonium salts, or nano-metal oxides (such as nano-zinc oxide) to achieve antibacterial effects. However, these methods have limitations: silver ions are expensive and may be controversial regarding biotoxicity; organic antibacterial agents have a short effective period and easily lead to drug resistance in microorganisms; nanomaterials have weak adhesion to the matrix and may detach after long-term use, posing potential environmental and health risks.

[0003] Abrasion resistance and lifespan issues: To improve abrasion resistance, common methods include using high-denier fibers, blended metal yarns, or adding a coating to the back. These methods are all "passive" reinforcements; once the fiber surface is worn, its function irreversibly declines, leading to permanent damage to the carpet and affecting its appearance and lifespan.

[0004] Therefore, there is an urgent need in the field for a carpet fabric that can actively, efficiently, and safely inhibit the growth of microorganisms and can self-repair when worn, thereby significantly extending its service life. Summary of the Invention

[0005] In order to overcome some of the problems mentioned in the background above, the present invention provides an antibacterial and wear-resistant carpet fabric and a method for preparing the same, so as to at least partially solve the above problems.

[0006] According to the technical solution of the present invention, an antibacterial and wear-resistant carpet fabric is provided, comprising a surface antibacterial area, a middle wear-resistant area and a bottom support area stacked sequentially from top to bottom; The surface antibacterial area is woven from functional fibers obtained by melt spinning a covalent organic framework material loaded with photosensitizer and polyamide. The intermediate wear-resistant zone is woven from a mixture of functional fibers and fibers embedded with self-healing microcapsules; The self-healing microcapsule includes a wall material and a core material disposed within the wall material. The wall material is polyurethane or melamine resin. The core material includes a repair monomer and a catalyst. The surface antibacterial zone and the middle wear-resistant zone are integrally formed by warp and weft weaving, and the surface is treated with water and oil repellency.

[0007] Furthermore, in the covalent organic framework material loaded with photosensitizer, the covalent organic framework is a two-dimensional sheet structure synthesized by a solvothermal method using trimesaldehyde and p-phenylenediamine as monomers. The photosensitizer is a porphyrin or phthalocyanine compound, and the photosensitizer is fixed in the pores of the covalent organic framework by covalent bonding or physical adsorption.

[0008] Furthermore, the photosensitizer is tetracarboxyphenylporphyrin, and the mass percentage of the photosensitizer in the antibacterial area is 3%-5%.

[0009] Furthermore, the repair monomer includes one of epoxy resin, cyanoacrylate monomer, or dicyclopentadiene; The catalyst includes a Lewis acid catalyst or a Grubb catalyst; The self-healing microcapsules have a particle size of 50-150 μm.

[0010] Furthermore, the fiber embedded with self-healing microcapsules is prepared by melt spinning, wherein the mass percentage of the self-healing microcapsules in the fiber is 5%-8%.

[0011] Furthermore, the underlying support area is formed by blending bio-based polyester with a flame retardant and then spinning and weaving it. The bio-based polyester is polylactic acid; the flame retardant is a halogen-free phosphorus flame retardant, and the flame retardant accounts for 5%-10% of the mass percentage in the bottom support area.

[0012] On the other hand, the present invention also provides a method for preparing antibacterial and wear-resistant carpet fabric, comprising the following steps: (1) Preparation of covalent organic framework material loaded with photosensitizer: Trimethylbenzaldehyde, p-phenylenediamine and photosensitizer are dissolved in organic solvent and subjected to solvothermal reaction to obtain covalent organic framework powder loaded with photosensitizer; (2) Preparation of self-healing microcapsules: Using polyurethane or melamine resin as the wall material and a mixture of repair monomers and catalysts as the core material, self-healing microcapsules are prepared by in-situ polymerization and then filtered and dried for later use. (3) Preparation of functional fibers: The covalent organic framework powder obtained in step (1) is mixed with polyamide chips and melt-spun to obtain functional fibers with antibacterial surface area; the self-healing microcapsules obtained in step (2) are mixed with polyamide chips and melt-spun to obtain fibers embedded with self-healing microcapsules. (4) Weaving and finishing: The functional fibers of the surface antibacterial area and the fibers embedded with self-healing microcapsules are woven into a composite fabric by warp and weft weaving, and then the woven fabric is treated with water and oil repellency. (5) Preparation of the bottom layer: After blending bio-based polyester chips with flame retardant, the fibers are melt-spun into support layer fibers, and then the bottom support fabric is formed by weaving or non-woven processes. The bottom support fabric is then laminated with the finished fabric obtained in step (4) to finally obtain the carpet fabric.

[0013] Preferably, the organic solvent is a mixture of mesitylene and 1,4-dioxane in an equimolar ratio.

[0014] Preferably, the solvothermal reaction in step (1) is carried out at 120°C for 48 hours. The preparation conditions for the in-situ polymerization method in step (2) are to react at 50-60℃ for 4-6 hours.

[0015] Furthermore, the present invention also provides an application of an antibacterial and wear-resistant carpet fabric, which is used as a floor covering material in medical institutions, hotels, and public transportation.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The photodynamic antibacterial system on the surface layer and the self-repairing system in the middle layer of this invention work together to improve the hygiene level and service life of carpets, solving the problem that existing technologies cannot achieve both simultaneously. By fixing the photosensitizer with COF material, the antibacterial components are stabilized and made long-lasting, avoiding the risk of nanomaterials falling off. Moreover, the photodynamic bactericidal effect is rapid and does not cause drug resistance.

[0017] This invention can repair microscopic damage multiple times through its self-healing function, preventing crack expansion and thus significantly improving the durability of carpets, reducing replacement frequency and maintenance costs. The bottom layer uses bio-based polyester, which partially replaces petroleum-based plastics, in line with the trend of green and environmentally friendly development. The overall structural design gives the carpet multiple functions such as flame retardancy and easy cleaning, expanding its application potential in high-requirement places. Detailed Implementation

[0018] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0019] This invention provides an antibacterial and wear-resistant carpet fabric, comprising a surface antibacterial area, a middle wear-resistant area, and a bottom support area stacked sequentially from top to bottom; The surface antibacterial area is woven from functional fibers obtained by melt spinning a covalent organic framework material loaded with photosensitizer and polyamide. The intermediate wear-resistant zone is woven from a mixture of functional fibers and fibers embedded with self-healing microcapsules; The self-healing microcapsule includes a wall material and a core material disposed within the wall material. The wall material is polyurethane or melamine resin. The core material includes a repair monomer and a catalyst. The surface antibacterial zone and the middle wear-resistant zone are integrally formed by warp and weft weaving, and the surface is treated with water and oil repellency.

[0020] In a further embodiment of this example, the covalent organic framework material loaded with photosensitizer is a two-dimensional sheet structure synthesized by a solvothermal method using trimesaldehyde and p-phenylenediamine as monomers. The photosensitizer is a porphyrin or phthalocyanine compound, and the photosensitizer is fixed in the pores of the covalent organic framework by covalent bonding or physical adsorption.

[0021] In a further embodiment of this example, the photosensitizer is tetracarboxyphenylporphyrin, and the mass percentage of the photosensitizer in the antibacterial area of ​​the surface is 3%-5%.

[0022] In a further embodiment of this example, the repair monomer includes one of epoxy resin, cyanoacrylate monomer, or dicyclopentadiene; The catalyst includes a Lewis acid catalyst or a Grubb catalyst; The self-healing microcapsules have a particle size of 50-150 μm.

[0023] In a further embodiment of this example, the fiber embedded with self-healing microcapsules is prepared by melt spinning, wherein the mass percentage of the self-healing microcapsules in the fiber embedded with self-healing microcapsules is 5%-8%.

[0024] In a further embodiment of this example, the bottom support area is made by blending bio-based polyester with a flame retardant and then spinning and weaving it. The bio-based polyester is polylactic acid; the flame retardant is a halogen-free phosphorus flame retardant, and the flame retardant accounts for 5%-10% of the mass percentage in the bottom support area.

[0025] On the other hand, embodiments of the present invention also provide a method for preparing antibacterial and wear-resistant carpet fabric, comprising the following steps: (1) Preparation of covalent organic framework material loaded with photosensitizer: Trimethylbenzaldehyde, p-phenylenediamine and photosensitizer are dissolved in organic solvent and subjected to solvothermal reaction to obtain covalent organic framework powder loaded with photosensitizer; (2) Preparation of self-healing microcapsules: Using polyurethane or melamine resin as the wall material and a mixture of repair monomers and catalysts as the core material, self-healing microcapsules are prepared by in-situ polymerization and then filtered and dried for later use. (3) Preparation of functional fibers: The covalent organic framework powder obtained in step (1) is mixed with polyamide chips and melt-spun to obtain functional fibers with antibacterial surface area; the self-healing microcapsules obtained in step (2) are mixed with polyamide chips and melt-spun to obtain fibers embedded with self-healing microcapsules. (4) Weaving and finishing: The functional fibers of the surface antibacterial area and the fibers embedded with self-healing microcapsules are woven into a composite fabric by warp and weft weaving, and then the woven fabric is treated with water and oil repellency. (5) Preparation of the bottom layer: After blending bio-based polyester chips with flame retardant, the fibers are melt-spun into support layer fibers, and then the bottom support fabric is formed by weaving or non-woven processes. The bottom support fabric is then laminated with the finished fabric obtained in step (4) to finally obtain the carpet fabric.

[0026] In a further embodiment of this example, the organic solvent is a mixture of mesitylene and 1,4-dioxane in an equimolar ratio.

[0027] In a further embodiment of this example, the solvothermal reaction in step (1) is carried out at 120°C for 48 hours. The preparation conditions for the in-situ polymerization method in step (2) are to react at 50-60℃ for 4-6 hours.

[0028] A further embodiment of the present invention also provides an application of an antibacterial and wear-resistant carpet fabric, which is used as a floor covering material in medical institutions, hotels, and public transportation.

[0029] It should be noted that this invention integrates photodynamic antibacterial therapy with microcapsule self-repair technology across fields and applies them synergistically to carpet fabrics to produce a synergistic effect.

[0030] Photosensitizers, such as porphyrin compounds, absorb light energy and transition from the ground state to an excited state under natural or artificial light. In the excited state, the photosensitizer transfers energy to surrounding ground-state oxygen molecules, activating them into highly reactive singlet oxygen or other reactive oxygen species. These reactive oxygen species indiscriminately attack vital biological components such as bacterial cell membranes, enzymes, proteins, and nucleic acids, inactivating them through intense oxidation reactions, leading to irreversible bacterial death. This invention anchors the photosensitizer within the pores of a covalent organic framework, preventing leaching and loss, ensuring that it only produces bactericidal substances in situ in the illuminated area, thus ensuring safety for the environment and human health.

[0031] Microcapsules filled with repair monomers and catalysts are pre-embedded inside fibers. When microcracks develop in the fibers due to daily foot traffic and friction, the propagation of the cracks punctures the microcapsules in their path. After the microcapsules rupture, the liquid core material, the repair monomers and catalysts, rapidly penetrate and fill the crack gaps through capillary action. Subsequently, the catalyst initiates a polymerization reaction of the monomers, forming a solid polymer at the damaged site, thereby re-bonding the cracks and achieving self-repair.

[0032] Example 1 Preparation of COF-photosensitizer carrier: Weigh out pyromellitic aldehyde and p-phenylenediamine, and dissolve them in a mixed solvent consisting of equimolar amounts of pyromellitic aldehyde and 1,4-dioxane.

[0033] Tetracarboxyphenylporphyrin was added as a photosensitizer, and the mixture was ultrasonically treated to ensure its full dispersion.

[0034] The mixed solution was transferred to a high-pressure reactor lined with polytetrafluoroethylene and reacted at 120°C for 48 hours.

[0035] After the reaction was completed, the mixture was cooled to room temperature, and the pink precipitate was collected by centrifugation. The precipitate was then washed three times with anhydrous ethanol and acetone, and dried in a vacuum drying oven at 80°C for 12 hours to obtain COF powder loaded with photosensitizer, wherein the photosensitizer accounted for 4%.

[0036] Preparation of self-healing microcapsules: Core material preparation: Epoxy resin E-51 and ethyl triphenylphosphine tetraphenyl borate catalyst are mixed at a mass ratio of 93:7.

[0037] The above core material mixture was slowly added dropwise to an aqueous solution containing 1% sodium dodecyl sulfate emulsifier while stirring at 300 rpm to form an oil-in-water emulsion.

[0038] Slowly add the prepolymer waterborne polyurethane used as a wall material, and adjust the pH to 4.0 with acetic acid.

[0039] The reaction was carried out in a 55°C water bath at a speed of 400 rpm for 5 hours.

[0040] After the reaction was completed, the mixture was filtered, washed with deionized water, and dried under vacuum at 40°C to obtain white powdery microcapsules with a particle size of 80-120 micrometers.

[0041] Preparation of functional fibers: Antibacterial fiber: The above COF-photosensitizer powder and nylon 6 chips are mixed evenly in a high-speed mixer at a mass ratio of 4%, and then melt-blended and granulated at 240°C by a twin-screw extruder. Finally, melt spinning is performed to obtain antibacterial fiber with a single filament fineness of 3 denier.

[0042] Self-healing fiber: Self-healing microcapsules are mixed with nylon 6 chips at a mass ratio of 7%, and the same melt spinning process is used to control the spinning temperature at 230℃ to prevent the microcapsules from rupturing prematurely, thus obtaining self-healing fiber.

[0043] Weaving and finishing: Antibacterial fibers are used as warp and surface weft yarns, and self-healing fibers are used as middle layer weft yarns. The fabric is woven into a three-layer structure using a rapier loom.

[0044] The woven fabric is treated in an impregnation solution containing fluorocarbon water and oil repellent agents, with the roll-off rate controlled at 70%, and then shaped and dried at 120℃.

[0045] Bio-based polylactic acid (PLA) chips are melt-blended and granulated with a halogen-free phosphorus-based flame retardant at 8% of PLA mass using a twin-screw extruder. The resulting PLA monofilaments are then melt-spun and woven into a nonwoven fabric. Finally, the PLA nonwoven fabric is bonded to the back of a water- and oil-repellent treated fabric using a hot-rolling process to form the underlying support layer, yielding the final product.

[0046] Example 2 The difference from Example 1 is that the photosensitizer is replaced with zinc phthalocyanine, and the loading amount accounts for 5% of the mass of the antibacterial area on the surface.

[0047] The COF-photosensitizer powder and nylon 6 chips were mixed evenly in a high-speed mixer at a mass ratio of 3%.

[0048] Example 3 The difference from Example 1 is that the core material of the self-healing microcapsule is replaced with a dicyclopentadiene and Grubb catalyst system, and the wall material is melamine resin.

[0049] The COF-photosensitizer powder and nylon 6 chips were mixed evenly in a high-speed mixer at a mass ratio of 5%.

[0050] Example 4 The difference from Example 1 is that the matrix polymer of both the antibacterial fiber and the self-healing fiber is replaced with polypropylene terephthalate.

[0051] Example 5 The difference from Example 1 is that the photosensitizer loading accounts for 5% of the mass of the antibacterial surface area; and the self-healing microcapsules are mixed with nylon 6 slices at a mass ratio of 8%.

[0052] Example 6 The difference from Example 1 is that the bottom layer is made of a mixture of 70% PLA and 30% recycled polyester staple fiber, blended with 8% flame retardant, and then made into a composite nonwoven fabric by needle punching.

[0053] Comparative Example 1 The difference from Example 1 is that ordinary nylon 6 fibers without COF-photosensitizer were prepared.

[0054] Comparative Example 2 The difference from Example 1 is that ordinary nylon 6 fibers without microcapsules were prepared as a substitute for self-healing fibers.

[0055] All samples obtained from the embodiments and comparative examples were subjected to uniform testing. The test items, methods, standards, and results are as follows: 1. Antibacterial performance test: Test standard: GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method".

[0056] Tested bacteria: Staphylococcus aureus (Gram-positive bacteria, ATCC 6538), Escherichia coli (Gram-negative bacteria, ATCC 25922).

[0057] Lighting conditions: Simulated indoor fluorescent lighting, illuminance 500±50 lux, continuous irradiation for 24 hours. Contact time: 24 hours.

[0058] Results calculation: Antibacterial rate (%) = [(Number of colonies in blank control - Number of colonies in sample) / Number of colonies in blank control] × 100%.

[0059] Table 1: Antibacterial Performance Test Data

[0060] As shown in Table 1 above, all examples containing COF-photosensitizer exhibited excellent antibacterial performance (>94%), confirming the effectiveness of the photodynamic antibacterial principle. Comparative Example 1 showed virtually no antibacterial effect, while the antibacterial performance of Comparative Example 2 was unaffected, demonstrating that antibacterial and repair functions are relatively independent.

[0061] Porphyrin-based photosensitizers are slightly better than phthalocyanine-based ones; the antibacterial effect is positively correlated with the amount of COF-photosensitizer added.

[0062] 2. Wear resistance and self-healing performance test: Test standard: Abrasion resistance: GB / T 21196.3-2007 "Textiles - Martindale method for determination of abrasion resistance of fabrics".

[0063] Self-healing effect: The repair rate is quantified through microscopic observation and image analysis.

[0064] Test method: The Martindale abrasion tester was used to test the fabric until the surface showed obvious pilling or holes.

[0065] Stop at specific stages (after 10,000 or 20,000 wear cycles) and create standard scratches (10 mm long and 50 μm deep) using a micro-scratch instrument.

[0066] Let stand for 48 hours under standard conditions (23±2℃, 50±5%RH).

[0067] The scratches were observed using a digital microscope (200×), and the repair rate was calculated using image analysis software: Repair rate (%) = [(Initial scratch cross-sectional area - Remaining scratch cross-sectional area) / Initial scratch cross-sectional area] × 100%.

[0068] Table 2. Data on wear resistance and self-healing performance

[0069] As shown in Table 2 above, the examples containing microcapsules all exhibited self-repair capabilities after wear, with a repair rate of over 70%.

[0070] Comparative Example 2 showed no self-healing ability, proving that microcapsules are key to the repair function; Example 3 showed the highest repair rate, demonstrating the performance differences of different repair systems; wear life was positively correlated with the amount of microcapsules added; Example 4 showed the highest number of wear cycles, but a slightly lower repair rate.

[0071] 3. Physical and mechanical property testing: Testing standards: Breaking strength: GB / T 3923.1-2013 "Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break".

[0072] Tear strength: GB / T 3917.3-2009 Textiles - Tear properties of fabrics - Part 3: Determination of tear strength of trapezoidal specimens.

[0073] Dimensional stability: GB / T 8628-2013 "Preparation, marking and measurement of fabric samples and garments for the test of dimensional change of textiles".

[0074] Table 3 Physical and mechanical properties data

[0075] As shown in Table 3 above, the physical and mechanical properties of all embodiments meet or exceed the standards for commercial carpet fabrics (breaking strength > 600N, tear strength > 50N). Embodiment 4 exhibits the best overall mechanical properties. Embodiment 5 shows a slight decrease in performance due to the slight impact of the added components on fiber continuity, but still meets the standards; the addition of functional components has a controllable impact on the basic physical properties.

[0076] 4. Flame retardant performance test: Test standard: GB / T 5454-1997 "Textiles - Test for Burning Performance - Oxygen Index Method"; Test conditions: Temperature 23±2℃, Humidity 50±5%RH.

[0077] Table 4 Flame retardant performance data

[0078] As shown in Table 4, the LOI values ​​of all samples exceeded 28%, meeting the flame retardant material standard (LOI>26%).

[0079] The phosphorus-based flame retardant played a stabilizing role in the PLA substrate layer, with very little difference between the samples.

[0080] 5. Safety and durability testing: Testing standards: Photosensitizer leaching rate: ISO 105-E04:2013 "Textiles - Tests for color fastness - Part E04: Color fastness to perspiration".

[0081] Color fastness to light: GB / T 8427-2019 "Textiles - Tests for color fastness to artificial light: Xenon arc".

[0082] Wash fastness: GB / T 12490-2014 "Textiles - Tests for color fastness to household and commercial washing"

[0083] Test method: Leaching rate test: The sample was soaked in simulated sweat for 24 hours, and the photosensitizer content in the leachate was detected by liquid chromatography-mass spectrometry (LC-MS).

[0084] Table 5: Safety and Durability Data

[0085] As shown in Table 5, the photosensitizer leaching rate of all embodiments is far below the safety limit (<1.0 μg / g), proving that the COF carrier has an excellent fixation effect on the photosensitizer; the light fastness is good, indicating that the functional components are stable under light; after 5 standard washes, the main antibacterial and self-repair functions are retained at a rate of over 78%, showing good durability.

[0086] In summary, this invention overcomes the shortcomings of traditional antibacterial agents such as silver ions and quaternary ammonium salts, which are prone to drug resistance and may leach harmful substances. It achieves a safe, long-lasting, and broad-spectrum antibacterial effect, transforming the material's passive resistance to wear into active repair of damage, significantly extending its service life, and solving the industry pain point of carpets being scrapped due to localized wear.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An antibacterial and wear-resistant carpet fabric, characterized in that, It includes a surface antibacterial zone, an intermediate wear-resistant zone, and a bottom support zone, which are stacked sequentially from top to bottom; The surface antibacterial area is woven from functional fibers obtained by melt spinning a covalent organic framework material loaded with photosensitizer and polyamide. The intermediate wear-resistant zone is woven from a mixture of functional fibers and fibers embedded with self-healing microcapsules; The self-healing microcapsule includes a wall material and a core material disposed within the wall material. The wall material is polyurethane or melamine resin. The core material includes a repair monomer and a catalyst. The surface antibacterial zone and the middle wear-resistant zone are integrally formed by warp and weft weaving, and the surface is treated with water and oil repellency.

2. The antibacterial and wear-resistant carpet fabric according to claim 1, characterized in that, In the covalent organic framework material loaded with photosensitizer, the covalent organic framework is a two-dimensional sheet structure synthesized by a solvothermal method using trimesaldehyde and p-phenylenediamine as monomers. The photosensitizer is a porphyrin or phthalocyanine compound, and the photosensitizer is fixed in the pores of the covalent organic framework by covalent bonding or physical adsorption.

3. The antibacterial and wear-resistant carpet fabric according to claim 2, characterized in that, The photosensitizer is tetracarboxyphenylporphyrin, and the mass percentage of the photosensitizer in the antibacterial area of ​​the surface is 3%-5%.

4. The antibacterial and wear-resistant carpet fabric according to claim 1, characterized in that, The repair monomer includes one of epoxy resin, cyanoacrylate monomer or dicyclopentadiene; The catalyst includes a Lewis acid catalyst or a Grubb catalyst; The self-healing microcapsules have a particle size of 50-150 μm.

5. The antibacterial and wear-resistant carpet fabric according to claim 4, characterized in that, The fiber embedded with self-healing microcapsules is prepared by melt spinning, wherein the self-healing microcapsules account for 5%-8% of the mass percentage of the fiber.

6. The antibacterial and wear-resistant carpet fabric according to claim 1, characterized in that, The underlying support area is made by blending bio-based polyester with flame retardant and then spinning and weaving it. The bio-based polyester is polylactic acid; the flame retardant is a halogen-free phosphorus flame retardant, and the flame retardant accounts for 5%-10% of the mass percentage in the bottom support area.

7. A method for preparing an antibacterial and wear-resistant carpet fabric as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Preparation of covalent organic framework material loaded with photosensitizer: Trimethylbenzaldehyde, p-phenylenediamine and photosensitizer are dissolved in organic solvent and subjected to solvothermal reaction to obtain covalent organic framework powder loaded with photosensitizer; (2) Preparation of self-healing microcapsules: Using polyurethane or melamine resin as the wall material and a mixture of repair monomers and catalysts as the core material, self-healing microcapsules are prepared by in-situ polymerization and then filtered and dried for later use. (3) Preparation of functional fibers: The covalent organic framework powder obtained in step (1) is mixed with polyamide chips and melt-spun to obtain functional fibers with antibacterial surface area; the self-healing microcapsules obtained in step (2) are mixed with polyamide chips and melt-spun to obtain fibers embedded with self-healing microcapsules. (4) Weaving and finishing: The functional fibers of the surface antibacterial area and the fibers embedded with self-healing microcapsules are woven into a composite fabric by warp and weft weaving, and then the woven fabric is treated with water and oil repellency. (5) Preparation of the bottom layer: After blending bio-based polyester chips with flame retardant, the fibers are melt-spun into support layer fibers, and then the bottom support fabric is formed by weaving or non-woven processes. The bottom support fabric is then laminated with the finished fabric obtained in step (4) to finally obtain the carpet fabric.

8. The method for preparing the antibacterial and wear-resistant carpet fabric according to claim 7, characterized in that, The organic solvent is a mixture of mesitylene and 1,4-dioxane in an equimolar ratio.

9. The method for preparing the antibacterial and wear-resistant carpet fabric according to claim 7, characterized in that, The solvothermal reaction in step (1) is carried out at 120°C for 48 hours. The preparation conditions for the in-situ polymerization method in step (2) are to react at 50-60℃ for 4-6 hours.

10. An application of an antibacterial and wear-resistant carpet fabric, characterized in that, The carpet fabric according to any one of claims 1-6 is used as a floor covering material in medical institutions, hotels, and public transportation.

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