An antibacterial stone-plastic flooring and its preparation method

Abstract

This invention relates to the field of stone-plastic flooring technology, specifically to an antibacterial stone-plastic flooring, comprising a substrate layer, a photocatalytic antibacterial layer, and a surface hydrophobic film. The photocatalytic antibacterial layer is disposed on the surface of the substrate layer, and the surface hydrophobic film is disposed on the surface of the photocatalytic antibacterial layer. The substrate layer comprises the following components in parts by weight: 60-80 parts of polyvinyl chloride, 300-350 parts of calcium carbonate, 30-50 parts of a composite antibacterial agent, and 1-5 parts of a coupling agent. This invention utilizes the synergistic effect of the composite antibacterial agent, with nano-tea polyphenols (which disrupt bacterial cell membranes) and chitosan (which inhibits bacterial metabolism) released slowly through a modified zeolite carrier, achieving an antibacterial rate of >99.5% against Escherichia coli, Staphylococcus aureus, etc., and covering both bacteria and molds on the antibacterial spectrum.

Description

Technical Field

[0001] This invention relates to the field of stone-plastic flooring technology, specifically to an antibacterial stone-plastic flooring and its preparation method. Background Technology

[0002] Stone-plastic flooring, also known as PVC flooring, is mostly made of sheets. It is a high-quality, high-tech new type of flooring material. It uses refined calcium carbonate powder and PVC resin as the main raw materials to form a solid base layer with a high-density, high-fiber mesh structure. The surface is decorated with a thermosetting melamine impregnation layer to form a wood-grain or stone-grain surface. The boards are processed through extrusion, lamination, slicing, grooving and other processes.

[0003] Traditional stone-plastic flooring is prone to bacterial and mold growth in humid environments, posing hygiene and safety risks, especially in settings such as hospitals and kitchens. Current technologies mainly improve the antibacterial performance of stone-plastic flooring by adding antibacterial agents, such as silver ions. However, silver ions are prone to oxidation and discoloration and are expensive. Single plant extracts have a narrow antibacterial spectrum and poor durability. Alternatively, antibacterial coatings can be applied to the surface of stone-plastic flooring to improve its antibacterial performance, but the surface coating is prone to wear and peeling, leading to a rapid decline in antibacterial performance. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems existing in the prior art and provide an antibacterial stone-plastic flooring and its preparation method.

[0005] To achieve the above objectives, the present invention provides an antibacterial stone plastic flooring, comprising a substrate layer, a photocatalytic antibacterial layer, and a surface hydrophobic film, wherein the photocatalytic antibacterial layer is disposed on the surface of the substrate layer, and the surface hydrophobic film is disposed on the surface of the photocatalytic antibacterial layer.

[0006] The substrate layer comprises the following components in parts by weight: 60-80 parts of polyvinyl chloride, 300-350 parts of calcium carbonate, 30-50 parts of composite antibacterial agent, and 1-5 parts of coupling agent.

[0007] The photocatalytic antibacterial layer comprises a heterojunction composite of nano-titanium dioxide and graphitic carbon nitride, wherein the mass ratio of nano-titanium dioxide to graphitic carbon nitride is 2:1 to 4:1 and the particle size is 20-50 nm.

[0008] Preferably, the surface hydrophobic film has a light transmittance of ≥85%, a contact angle of ≥110°, and a thickness of 10-30μm.

[0009] Preferably, the composite antibacterial agent comprises the following components in parts by weight: 3-7 parts of nano-tea polyphenols, 2-6 parts of chitosan, and 10-20 parts of zeolite powder.

[0010] Preferably, the preparation method of the composite antibacterial agent includes the following steps:

[0011] a. Soak zeolite powder in 2 mol / L HCl for 2 hours, wash until neutral, and calcine at 500℃ for 3 hours to expand the pores;

[0012] b. Disperse activated zeolite powder in 2% acetic acid solution, add chitosan, stir at 60°C for 4 hours to allow chitosan to enter the zeolite channels through electrostatic adsorption, then add silane coupling agent (KH-550), adjust pH to 6, react at 70°C for 2 hours, centrifuge, wash and dry to obtain chitosan modified zeolite carrier.

[0013] c. Immerse the modified zeolite carrier in glutaraldehyde solution, shake at 40°C for 1 hour to activate the surface amino groups, add nano-tea polyphenols, adjust the pH to 6, and react at 60°C for 6 hours to allow the phenolic hydroxyl groups of tea polyphenols to bond with the amino groups of chitosan through Schiff base reaction.

[0014] d. Finally, wash three times with PBS to remove unreacted substances, and dry under vacuum at 45°C to obtain the composite antibacterial agent.

[0015] Preferably, the chitosan has a degree of deacetylation ≥90% and a molecular weight of 5×10⁻⁶. 4 .

[0016] Preferably, the pore size of the modified zeolite carrier is 2-5 nm, and the molar ratio of nano-tea polyphenols to chitosan is 1:2 to 1:4.

[0017] Preferably, the thickness of the photocatalytic antibacterial layer is 1 / 5 to 1 / 3 of the thickness of the substrate layer.

[0018] A method for preparing antibacterial stone-plastic flooring includes the following steps:

[0019] S1. Substrate pretreatment: Mix polyvinyl chloride, calcium carbonate and coupling agent, and activate at 80-90℃ for 30-60 minutes to obtain the pretreated substrate;

[0020] S2, Antibacterial agent grafting: The composite antibacterial agent is mixed with the pretreated substrate and grafted copolymerized by solid-phase mechanochemical method at 80-100℃ and 5-12MPa pressure. Then, it is extruded and molded to obtain the substrate layer.

[0021] S3. Molding: The substrate layer, photocatalytic antibacterial layer and hydrophobic film layer are combined through a hot-pressing composite process to form a complete antibacterial stone plastic floor blank;

[0022] S4. Calendering: The formed antibacterial stone plastic flooring blank is calendered and shaped, and after cooling, the antibacterial stone plastic flooring can be obtained.

[0023] Preferably, the reaction time of the solid-phase mechanochemical method in step S2 is 20-40 minutes, and the grafting rate of the antibacterial agent to PVC is 85%-95%.

[0024] Preferably, the extrusion temperature of the substrate layer is 150-170℃, the extrusion temperature of the photocatalytic antibacterial layer is 140-150℃, and the extrusion temperature of the hydrophobic film layer is 120-135℃.

[0025] Through the above technical solution, the present invention has the following technical effects:

[0026] This invention utilizes the synergistic effect of composite antibacterial agents. Nano-tea polyphenols (which disrupt bacterial cell membranes) and chitosan (which inhibit bacterial metabolism) are released slowly through a modified zeolite carrier, achieving an antibacterial rate of >99.5% against Escherichia coli, Staphylococcus aureus, and other bacteria. The antibacterial spectrum covers both bacteria and molds. Furthermore, through a photocatalytic antibacterial layer, the nitrogen-rich surface of graphitic carbon nitride adsorbs negatively charged bacteria through electrostatic interactions, enriching them on the catalyst surface. This locally increases the ROS concentration, accelerates the killing process, and provides an antibacterial effect. Moreover, the hydrophobic film on the surface has a contact angle ≥110°, which can effectively block moisture penetration and further reduce the risk of mold growth. Detailed Implementation

[0027] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0028] Example 1

[0029] An antibacterial stone plastic flooring includes a substrate layer, a photocatalytic antibacterial layer, and a surface hydrophobic film. The photocatalytic antibacterial layer is disposed on the surface of the substrate layer, and the surface hydrophobic film is disposed on the surface of the photocatalytic antibacterial layer. The surface hydrophobic film has a light transmittance of ≥85%, a contact angle of ≥110°, and a thickness of 30μm.

[0030] The substrate layer comprises the following components in parts by weight: 80 parts polyvinyl chloride, 350 parts calcium carbonate, 30 parts composite antibacterial agent, and 5 parts coupling agent.

[0031] The photocatalytic antibacterial layer comprises a heterojunction composite of nano-titanium dioxide and graphitic carbon nitride, with a mass ratio of nano-titanium dioxide to graphitic carbon nitride of 2:1 and a particle size of 50 nm. The thickness of the photocatalytic antibacterial layer is 1 / 5 of the thickness of the substrate layer.

[0032] It should be noted that the photocatalytic antibacterial layer is prepared as follows: Melamine or urea is placed in a crucible and heated to 550℃ at a rate of 5℃ / min in air atmosphere, calcined for 4 hours, cooled, and then ground into nano-sized powder (particle size 50nm) to obtain graphitic carbon nitride. Anatase titanium dioxide (particle size 50nm) is then surface-modified using a silane coupling agent (such as KH-550) to enhance its dispersibility and interfacial bonding ability, thus obtaining nano-titanium dioxide. Graphitic carbon nitride and nano-titanium dioxide are mixed at a mass ratio of 1:4, and deionized water is added. Ethanol (volume ratio 3:1) was ultrasonically dispersed for 1 hour, then transferred to a high-pressure reactor and solvothermal reacted at 160°C for 12 hours to form a tightly bound Z-shaped heterojunction structure. After centrifugation, washing, and drying, a composite photocatalytic powder was obtained. The composite photocatalytic powder and dispersant were then placed into a mixing tank and mixed under precisely controlled temperature, pressure, time, and speed. Finally, the mixed raw materials were filled into an extruder and extruded under precisely controlled temperature, pressure, time, and speed to obtain a photocatalytic antibacterial layer.

[0033] It should be explained that the conduction band of graphitic carbon nitride (-1.1 eV) is higher than that of titanium dioxide (+2.7 eV). Under illumination, the photogenerated electrons (e) of graphitic carbon nitride... - ) and the holes (h) of titanium dioxide + ) composite, while the holes (h) of graphitic carbon nitride + ) and the electrons (e) of titanium dioxide - ) is retained, forming a Z-shaped transmission path, and h is retained. + (Graphite-phase carbon nitride) has strong oxidizing properties and can directly attack bacterial cell membranes; - Titanium dioxide reduces O2 to generate superoxide radicals (·O2). - ), which work together to destroy microbial DNA.

[0034] The compound antibacterial agent comprises the following components in parts by weight: 3 parts nano-tea polyphenols, 2 parts chitosan, and 10 parts zeolite powder.

[0035] Specifically, the nano-tea polyphenols used in this application were purchased from Shaanxi Xintianyu Biotechnology Co., Ltd. The mechanism of action of the nano-tea polyphenols in this application is as follows: tea polyphenol molecules contain multiple phenolic hydroxyl groups (-OH), possessing strong hydrophobicity and electron donor capabilities, allowing them to insert into the phospholipid bilayer of bacterial cell membranes and disrupt their integrity; through hydrogen bonding and hydrophobic interactions, they bind to membrane proteins, leading to membrane perforation (TEM observation showed significant rupture in the E. coli cell membrane). After cell membrane rupture, intracellular ions (kJ / kJ / kE2) are released into the cell. + Ca 2+The outflow of proteins and bacteria leads to osmotic pressure imbalance and death (verified by conductivity experiments, the conductivity of the solution increased by 200% after 1 hour of treatment). Tea polyphenols have a high affinity for the outer membrane lipopolysaccharide (LPS) of Gram-negative bacteria (such as Escherichia coli) and preferentially destroy the outer membrane structure.

[0036] Specifically, the chitosan was purchased from Huai'an Runjie Industry and Trade Co., Ltd. Chitosan is used to inhibit bacterial metabolism and enzyme activity. Its mechanism of action is as follows: the chitosan molecular chain is rich in amino groups (-NH2), which protonate to a positive charge (-NH3) under acidic conditions. + Chitosan binds to negatively charged lipopolysaccharides (LPS) or teichoic acid on the bacterial surface via electrostatic adsorption, blocking nutrient absorption pathways. It penetrates into the cell, binding to DNA and inhibiting transcription (agarose gel electrophoresis shows impaired DNA migration); it also inhibits the activity of key bacterial enzymes (such as ATPase and β-galactosidase) (enzyme activity tests show a 70%-85% reduction in activity), and exhibits strong penetrability to the peptidoglycan layer of Staphylococcus aureus (Gram-positive bacteria) and the chitinous cell walls of fungi (SEM shows cell surface collapse).

[0037] Specifically, in this application, the modified zeolite carrier is used for sustained release and synergistic effect. Its mechanism of action is as follows: after the zeolite is acidified and expanded (pore size 2-5 nm), tea polyphenols and chitosan molecules are loaded into the pores through capillary action (BET test shows that the pore volume increases to 0.8 cm). 3 / g); Nano-sized tea polyphenols (particle size 50-80nm) are confined in the pores, avoiding aggregation and failure (TEM shows uniform dispersion). Chitosan forms hydrogen bonds with the silanol groups (Si-OH) on the zeolite surface through amino groups, and tea polyphenols crosslink with the amino groups of chitosan through phenolic hydroxyl groups (FT-IR shows a Schiff base characteristic peak at 1640cm-1); In a humid environment, water molecules gradually break the hydrogen bonds, achieving slow release of the antibacterial agent (in vitro sustained-release experiments show a release rate of <50% after 30 days). The negative charge on the zeolite surface adsorbs positively charged bacteria (such as Staphylococcus aureus), locally concentrating the antibacterial agent concentration and improving contact efficiency (Zeta potential test shows a bacterial adsorption rate of >80%); Zeolite adsorbs toxins produced by bacterial metabolism (such as endotoxins), blocking secondary pollution.

[0038] It should be noted that the synergistic effect of nano-tea polyphenol chitosan and modified zeolite carrier in this application is as follows: tea polyphenols mainly target the physical destruction of cell membranes (highly effective against Gram-negative bacteria); chitosan interferes with metabolism and enzyme activity (highly effective against Gram-positive bacteria and fungi); the two work together to cover the common targets of bacteria and fungi (such as cell membranes and metabolic enzymes), tea polyphenols rapidly destroy cell membranes, making it easier for chitosan to enter the cell; the zeolite carrier continuously releases antibacterial agents to inhibit the regeneration of residual bacteria.

[0039] The composite antibacterial agent in this application is self-made, and the preparation method includes the following steps: First, zeolite powder is soaked in 2 mol / L HCl for 2 hours, washed until neutral, and calcined at 500℃ for 3 hours to expand the pores; then, activated zeolite powder is dispersed in 2% acetic acid solution, and chitosan is added. The degree of deacetylation of chitosan is ≥90%, and the molecular weight is 5×10. 4 The mixture was stirred at 60℃ for 4 hours to allow chitosan to enter the zeolite channels via electrostatic adsorption. Then, a silane coupling agent (KH-550) was added, the pH was adjusted to 6, and the reaction was carried out at 70℃ for 2 hours. After centrifugation, washing, and drying, a chitosan-modified zeolite carrier was obtained. The pore size of the modified zeolite carrier was 5 nm, and the molar ratio of nano-tea polyphenols to chitosan was 1:2. The modified zeolite carrier was then immersed in a glutaraldehyde solution and shaken at 40℃ for 1 hour to activate the surface amino groups. Nano-tea polyphenols were added, the pH was adjusted to 6, and the reaction was carried out at 60℃ for 6 hours, allowing the phenolic hydroxyl groups of tea polyphenols to bond with the amino groups of chitosan via Schiff base reaction. Finally, the mixture was washed three times with PBS to remove unreacted substances and dried under vacuum at 45℃ to obtain a composite antibacterial agent.

[0040] It should be noted that the amino activity is optimal at pH 6.0 in this application to avoid the self-oxidation of tea polyphenols; the reaction temperature is ≤60℃ to prevent the degradation of chitosan chains; and the problems of easy migration of tea polyphenols and poor solubility of chitosan are solved by chemical bonding rather than physical mixing. The zeolite pore size (2-5nm) matches the bacterial size (0.5-5μm), and the efficiency is improved through the "adsorption-killing" synergistic mechanism.

[0041] This embodiment describes a method for preparing antibacterial stone-plastic flooring, comprising the following steps: First, polyvinyl chloride, calcium carbonate, and a coupling agent are mixed and activated at 90°C for 60 minutes to obtain a pretreated substrate; then, a composite antibacterial agent is mixed with the pretreated substrate and grafted copolymerized at 100°C and 12 MPa pressure using a solid-state mechanochemical method to obtain a substrate layer. The reaction time of the solid-state mechanochemical method is 40 minutes, and the grafting rate between the antibacterial agent and PVC is 95%; then, the substrate layer, the photocatalytic antibacterial layer, and the hydrophobic film layer are composited using a hot-pressing composite process to form a complete antibacterial stone-plastic flooring blank; the formed antibacterial stone-plastic flooring blank is calendered and shaped, and after cooling, the antibacterial stone-plastic flooring is obtained.

[0042] It should be explained that in this application, the antibacterial agent is grafted and copolymerized with the PVC substrate layer at 80-100℃ using a solid-phase mechanochemical method, which avoids the destruction of the activity of natural antibacterial components by high temperature (traditional process >160℃), thereby increasing the bonding strength of the antibacterial agent by 50% and the floor density uniformity error <0.5% (the industry standard is 2%).

[0043] Example 2

[0044] The only difference between this embodiment and Embodiment 1 is that in this embodiment, there are 35 parts of the compound antibacterial agent, while all other conditions are the same.

[0045] Example 3

[0046] The only difference between this embodiment and Embodiment 1 is that in this embodiment, 40 parts of the compound antibacterial agent are used, while all other conditions are the same.

[0047] Example 4

[0048] The only difference between this embodiment and Embodiment 1 is that in this embodiment, 50 parts of the compound antibacterial agent are used, while all other conditions are the same.

[0049] Comparative Example 1

[0050] The method is the same as in Example 1, except that silver ions are used instead of the compound antibacterial agent.

[0051] Comparative Example 2

[0052] The method is the same as in Example 1, except that it does not contain a compound antibacterial agent.

[0053] Comparative Example 3

[0054] The method is the same as in Example 1, except that the ratio of the composite antibacterial agent is different, as follows: The composite antibacterial agent includes the following components in parts by weight: 5 parts of nano tea polyphenols, 3 parts of chitosan and 15 parts of zeolite powder.

[0055] Comparative Example 4

[0056] The method of Example 1 is the same, except that the ratio of the composite antibacterial agent is different, as follows: The composite antibacterial agent includes the following components in parts by weight: 7 parts of nano tea polyphenols, 6 parts of chitosan and 20 parts of zeolite powder.

[0057] Experimental Example

[0058] 1. Antibacterial rate test: The 24-hour antibacterial rate of Escherichia coli (ATCC 25922) and Staphylococcus aureus (ATCC 6538) was tested according to ISO 22196 standard;

[0059] Samples were prepared according to Examples 1-4 and Comparative Examples 1-4, and the antibacterial properties of the nonwoven fabrics of each sample were tested in accordance with ISO 22196 standard.

[0060] First, place an antibacterial stone plastic floor on a petri dish, drop 25 μl of bacterial solution on the surface, and incubate for 10 min in both light (xenon lamp with a 600 nm filter) and dark environments. Then, dilute the original bacterial solution and the bacterial solution on the sample sequentially by 106 times in centrifuge tubes to prepare a 10-fold dilution series.

[0061] Take 10 μl of solution from each centrifuge tube in the dilution series and inject it into a Petri dish containing agar medium. Incubate at 37°C for 24 h. Finally, measure the colony count, calculate the antibacterial rate (%), and evaluate the antibacterial effect.

[0062] Inhibition rate = (Number of colonies in the original inoculation sample - Number of colonies remaining after antibacterial treatment) / Number of colonies in the original inoculation sample × 100%;

[0063] The bacterial culture used two groups of bacteria: Staphylococcus aureus at a concentration of 1.36 × 10⁶ CFU / sample and Escherichia coli at a concentration of 1.79 × 10⁶ CFU / sample.

[0064] The experimental results are shown in Table 1.

[0065] Table 1

[0066]

[0067]

[0068] As can be seen from the data in Table 1:

[0069] The higher the content of the compound antibacterial agent within the scope of this application, that is, when the compound antibacterial agent is 40 parts, the better its antibacterial performance. The improvement is slight. The data of Example 4 in Table 1 is significantly different from the data of Comparative Example 1. Therefore, the antibacterial effect of the compound antibacterial agent in this application is significantly better than that of the silver ion system.

[0070] It is worth noting that the data of Example 4 in Table 1 are not much different from those of Comparative Example 3. However, the antibacterial effect of Comparative Example 3 is better than that of Example 4. Therefore, when the composite antibacterial agent is 40 parts, and the composite antibacterial agent includes the following components in parts by weight: 5 parts of nano tea polyphenols, 3 parts of chitosan and 15 parts of zeolite powder, its antibacterial effect is the best.

[0071] 2. Abrasion resistance and aging resistance tests:

[0072] Taber wear test (CS-10 grinding wheel, 1000g load) was conducted according to GB / T 4085-2015; aging resistance test: QUV accelerated aging tester (UVB-313 lamp, 60℃ / 8h illumination + 50℃ / 4h condensation, cycle for 3000 hours).

[0073] The experimental results are shown in Table 2.

[0074] Table 2

[0075]

[0076]

[0077] As can be seen from the data in Table 2:

[0078] The composite antibacterial agent in this application maintains highly efficient antibacterial performance (>96%) even after wear and aging, while the traditional silver ion system has just reached the industry standard. Therefore, the synergistic effect of nano-tea polyphenol chitosan and modified zeolite carrier in this application is as follows: tea polyphenols mainly target the physical destruction of cell membranes (highly effective against Gram-negative bacteria); chitosan interferes with metabolism and enzyme activity (highly effective against Gram-positive bacteria and fungi); the two work together to cover the common targets of bacteria and fungi (such as cell membranes and metabolic enzymes), tea polyphenols rapidly destroy cell membranes, making it easier for chitosan to enter the cell; the zeolite carrier continuously releases antibacterial agents, inhibiting the regeneration of residual bacteria.

[0079] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An antibacterial stone-plastic flooring, characterized in that, It includes a substrate layer, a photocatalytic antibacterial layer, and a surface hydrophobic film, wherein the photocatalytic antibacterial layer is disposed on the surface of the substrate layer, and the surface hydrophobic film is disposed on the surface of the photocatalytic antibacterial layer; The substrate layer comprises the following components in parts by weight: 60-80 parts of polyvinyl chloride, 300-350 parts of calcium carbonate, 30-50 parts of composite antibacterial agent, and 1-5 parts of coupling agent. The photocatalytic antibacterial layer comprises a heterojunction composite of nano-titanium dioxide and graphite-phase carbon nitride, wherein the mass ratio of nano-titanium dioxide to graphite-phase carbon nitride is 2:1 to 4:

1. The composite antibacterial agent comprises the following components in parts by weight: 3-7 parts of nano-tea polyphenols, 2-6 parts of chitosan, and 10-20 parts of zeolite powder; The preparation method of the compound antibacterial agent includes the following steps: a. Soak zeolite powder in 2 mol / L HCl for 2 hours, wash until neutral, and calcine at 500℃ for 3 hours to expand the pores; b. Disperse activated zeolite powder in 2% acetic acid solution, add chitosan, stir at 60°C for 4 hours to allow chitosan to enter the zeolite channels through electrostatic adsorption, then add silane coupling agent KH-550, adjust pH to 6, react at 70°C for 2 hours, centrifuge, wash and dry to obtain chitosan modified zeolite carrier. c. Immerse the chitosan-modified zeolite carrier in glutaraldehyde solution, shake at 40°C for 1 hour to activate the surface amino groups, add nano-tea polyphenols, adjust the pH to 6, and react at 60°C for 6 hours to allow the phenolic hydroxyl groups of nano-tea polyphenols to bond with the amino groups of chitosan through Schiff base reaction. d. Finally, wash three times with PBS to remove unreacted substances, and dry under vacuum at 45°C to obtain the composite antibacterial agent; The chitosan has a degree of deacetylation ≥90% and a molecular weight of 5×10⁻⁶. 4 ; The chitosan-modified zeolite carrier has a pore size of 2-5 nm, and the molar ratio of nano-tea polyphenols to chitosan is 1:2 to 1:

4.

2. The antibacterial stone-plastic flooring according to claim 1, characterized in that, The surface hydrophobic film has a light transmittance of ≥85%, a contact angle of ≥110°, and a thickness of 10-30μm.

3. The antibacterial stone-plastic flooring according to claim 1, characterized in that, The thickness of the photocatalytic antibacterial layer is 1 / 5 to 1 / 3 of the thickness of the substrate layer.

4. A method for preparing antibacterial stone-plastic flooring, applicable to the antibacterial stone-plastic flooring according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Substrate pretreatment: Mix polyvinyl chloride, calcium carbonate and coupling agent, and activate at 80-90℃ for 30-60 minutes to obtain the pretreated substrate; S2, Composite antibacterial agent grafting: The composite antibacterial agent is mixed with the pretreated substrate and grafted copolymerized by solid-phase mechanochemical method at 80-100℃ and 5-12MPa pressure. Then, it is extruded and molded to obtain the substrate layer. S3. Molding: The substrate layer, photocatalytic antibacterial layer and surface hydrophobic film are combined through a hot-pressing composite process to form a complete antibacterial stone plastic floor blank; S4. Calendering: The formed antibacterial stone plastic flooring blank is calendered and shaped, and after cooling, the antibacterial stone plastic flooring can be obtained.

5. The method for preparing antibacterial stone-plastic flooring according to claim 4, characterized in that, The reaction time of the solid-phase mechanochemical method described in step S2 is 20-40 minutes, and the grafting rate of the composite antibacterial agent to polyvinyl chloride is 85%-95%.

6. The method for preparing antibacterial stone-plastic flooring according to claim 4, characterized in that, The extrusion temperature of the substrate layer in step S2 is 150-170℃.

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