A bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions and a preparation method thereof

Abstract

This invention discloses a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions and its preparation method, belonging to the field of functional fiber materials technology. The cleaning cloth uses bamboo charcoal fiber as the main body, combined with phosphorylated modified mulberry bark fiber. Zinc ions are used to chelate tea polyphenols and pomegranate peel tannins to form active components, which are then encapsulated in sodium alginate microcapsules and loaded into the porous structure of the fibers. Natural pyrethroid extract and β-cyclodextrin are added to achieve mite prevention and odor suppression. The preparation employs a green process of ultrasonic-assisted chelation and high-voltage electrostatic spray microcapsule preparation. This invention solves the problems of easy loss of antibacterial components and poor mechanical properties in traditional cleaning cloths. After 200 washes, the antibacterial rate remains at 95%-99%, and the tensile strength is 13.5-16.0 CN / dtex. It also has the advantages of being all-natural, residue-free, environmentally friendly, and mass-producible, making it suitable for household and medical cleaning applications.

Description

Technical Field

[0001] This invention belongs to the field of functional fiber materials technology, specifically relating to a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions and its preparation method. Background Technology

[0002] Bamboo charcoal fiber, with its excellent adsorption properties due to its porous structure, is widely used in cleaning cloths. However, the antibacterial and antiviral effects of bamboo charcoal fiber alone are limited, and existing modification technologies mostly rely on chemical antibacterial agents such as quaternary ammonium salts and nano-silver, which pose risks such as chemical residues and skin irritation. Meanwhile, traditional cleaning cloths often suffer from problems such as easy loss of antibacterial components, poor washability, mite infestation, and odor residue during use. The insufficient interfacial bonding of natural reinforcing materials such as mulberry bark fiber further leads to rapid degradation of the product's mechanical properties. Existing natural component modification technologies mostly focus on single functions, failing to form a synergistic system of antibacterial / antiviral, anti-mite, and odor suppression, and lack optimized designs for long-term fixation of functional components and fiber interfacial compatibility, making it difficult to meet the comprehensive requirements of safety, durability, and multifunctionality for cleaning cloths in home and medical settings. Therefore, developing a bamboo charcoal fiber cleaning cloth based on all-natural components, with stable synergistic functions, excellent mechanical properties, and environmental friendliness and mass production capability has become an important research direction in the field of functional cleaning materials. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions and its preparation method. This cleaning cloth constructs a synergistic system of antibacterial, antiviral, anti-mite, and odor-inhibiting properties with all-natural components as the core. It achieves long-term sustained release of functional components through phosphorylated modified mulberry bark fiber to strengthen interfacial bonding and sodium alginate microcapsules. While maintaining safety with no chemical residues, it also has excellent washability, mechanical properties, and breathability, which can meet the comprehensive needs of multiple scenarios such as home and medical use for cleaning cloths that are multifunctional, highly durable, and environmentally friendly.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions, the cleaning cloth being prepared from the following raw materials in parts by weight: Bamboo charcoal fiber 60-75 parts, phosphorylated modified mulberry bark fiber 15-25 parts, sodium alginate microcapsule-loaded polyphenol-zinc chelate 3-8 parts, natural pyrethroid extract 1-3 parts, β-cyclodextrin 2-4 parts. The phosphorylated modified mulberry bark fiber is prepared by reacting with a 10%-15% phosphoric acid solution at 60°C for 2 hours; the sodium alginate microcapsules have a particle size of 5-10 μm and encapsulate a chelate formed by a complex of tea polyphenols and pomegranate peel tannins and zinc ions; the natural pyrethroid extract has a purity of 95%-99% and a molar ratio of 1:2 with zinc ions; the cleaning cloth has a broad-spectrum antibacterial rate of 95%-99% after 200 washes and a tensile strength of 13.5-16.0 CN / dtex.

[0005] Preferably, the mass ratio of bamboo charcoal fiber to phosphorylated modified mulberry bark fiber is 7:3-8:2.

[0006] Preferably, the mass ratio of tea polyphenols to pomegranate peel tannins is 5:5-7:3.

[0007] Preferably, the preparation method of the bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions includes the following specific preparation steps: S1. Immerse mulberry bark fiber in 10%-15% phosphoric acid solution, react at 60℃ for 2 h, wash with water until neutral, and then dry to obtain phosphorylated modified mulberry bark fiber. S2. Mix tea polyphenols and pomegranate peel tannins at a mass ratio of 5:5-7:3, add 0.05-0.1 mol / L zinc ion solution, and react for 20-30 min at an ultrasonic power of 200-300 W and a temperature of 35-45℃ to form polyphenol-zinc chelates. S3. The chelate is dispersed in a 3%-5% sodium alginate solution and microcapsules with a particle size of 5-10 μm are prepared by high-voltage electrostatic spraying. The spraying voltage of the high-voltage electrostatic spraying method is 15-25 kV and the receiving distance is 10-15 cm. S4. Place bamboo charcoal fiber, phosphorylated modified mulberry bark fiber, microcapsules, natural pyrethroid extract, and β-cyclodextrin in a high-speed mixer and mix at 800-1200 rpm for 15-25 min. S5. The mixed fibers are woven and finished using a plain weave to obtain a bamboo charcoal fiber cleaning cloth; the setting temperature is 80-100℃ and the setting time is 10-15 min; the warp density of the weaving process is 200-220 threads / 10 cm and the weft density is 180-200 threads / 10 cm.

[0008] Preferably, the zinc ion solution in step S2 is a zinc sulfate solution or a zinc chloride solution.

[0009] Preferably, the cleaning cloth has an antibacterial rate of 99.5%-99.9% against Staphylococcus aureus and Escherichia coli, an antiviral activity rate of 99%-99.8% against influenza virus, and a mite repellency rate of 90%-98%.

[0010] Preferably, the air permeability of the cleaning cloth is 800-1000 mm / s, and the strength retention rate is 92%-98% after 50 washes.

[0011] The beneficial effects of this invention are as follows: The bamboo charcoal fiber cleaning cloth prepared by this invention possesses multiple excellent properties, with an antibacterial rate of 99.5%-99.9% against Staphylococcus aureus and Escherichia coli, an antiviral activity rate of 99%-99.8% against influenza virus, and a mite repellency rate of 90%-98%, achieving a synergistic effect of antibacterial, antiviral, anti-mite, and odor suppression; the sodium alginate microcapsule sustained-release design ensures that the cleaning cloth maintains an antibacterial rate of 95%-99% after 200 washes, demonstrating outstanding wash resistance; the phosphorylated modified mulberry bark fiber strengthens the interfacial bonding, resulting in a tensile strength of 13.5-16.0 CN / dtex and a strength retention rate of 92%-98% after 50 washes, exhibiting stable mechanical properties; the all-natural components have no chemical residues and an air permeability of 800-1000 mm / s, ensuring safe and comfortable use; the preparation process is environmentally friendly, free of organic solvents, and has low energy consumption, possessing mass production potential and adaptable to various scenarios. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0013] Figure 1 This is a bar chart comparing the antibacterial rates of different samples against Staphylococcus aureus after 24 hours and 200 cycles. Figure 2 Line graphs showing the wash resistance of different samples after 50 and 200 washes. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] Example 1

[0016] This embodiment 1 describes a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions. The cleaning cloth is prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts phosphorylated modified mulberry bark fiber, 5 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. The preparation method of the bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions in this embodiment includes the following specific preparation steps: S1. Take dried mulberry bark fibers (3-5 cm in length), immerse them in a 12% phosphoric acid solution (liquid ratio 1:20, fiber mass: solution volume), place them in a constant temperature water bath at 60℃ for 2 hours, stirring once every 30 minutes (300 rpm). After the reaction, rinse repeatedly with deionized water until the pH of the washing solution is 6.5-7.5, place them in an oven at 80℃ for 4 hours, remove them and cool them to room temperature to obtain phosphorylated modified mulberry bark fibers. S2. Weigh tea polyphenols and pomegranate peel tannins at a mass ratio of 6:4, mix them, add deionized water and ultrasonically disperse for 10 min (power 200 W) to prepare a 5% (w / w) composite polyphenol solution; slowly add 0.08 mol / L zinc sulfate solution (composite polyphenol to zinc ion molar ratio 1:1) to the composite polyphenol solution, and react at a constant temperature of 40℃ for 25 min with ultrasonic power 250 W. During the reaction, stir continuously at 200 rpm. After the reaction, centrifuge at 5000 rpm for 10 min to separate, collect the precipitate and vacuum dry at 60℃ for 3 h to obtain polyphenol-zinc chelate; S3. Weigh sodium alginate powder, add deionized water, stir and dissolve in an 80℃ water bath for 30 min to prepare a 4% sodium alginate solution, and cool to room temperature for later use; disperse the polyphenol-zinc chelate prepared in step S2 in the sodium alginate solution at a mass ratio of 1:5, and ultrasonically emulsify for 15 min (power 300 W) to form a uniform suspension; prepare microcapsules using a high-voltage electrostatic spraying device, setting the spraying voltage to 20 kV, receiving distance to 12 cm, feeding speed to 5 mL / h, ambient temperature to 25℃, and relative humidity to 50%; collect the sprayed microcapsule particles, vacuum dry at 60℃ for 2 h, and sieve to obtain sodium alginate microcapsules with a particle size of 7-8 μm; S4. Weigh bamboo charcoal fiber, phosphorylated modified mulberry bark fiber, sodium alginate microcapsules, natural pyrethroid extract and β-cyclodextrin, and add them sequentially to a high-speed mixer. Set the speed to 1000 rpm and mix at room temperature for 20 minutes to ensure that each component is evenly dispersed to obtain mixed fiber raw material. S5. The mixed fiber raw material is fed into a spinning machine for spinning to obtain plied yarn (linear density 30 tex); the greige fabric is woven in plain weave using a rapier loom, with a warp density of 210 ends / 10 cm and a weft density of 190 ends / 10 cm; the greige fabric is fed into a pre-shrinking machine for pre-shrinking treatment (temperature 60℃, speed 5 m / min); after pre-shrinking, it is transferred to a setting machine and set at a constant temperature of 85℃ for 12 min; after setting, it is naturally cooled to room temperature and cut to obtain the finished cleaning cloth.

[0017] Example 2

[0018] This embodiment 2 presents a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions, which is prepared from the following raw materials in parts by weight: 60 parts bamboo charcoal fiber, 28 parts phosphorylated modified mulberry bark fiber, 5 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. The preparation method of the bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions in this embodiment is the same as that in Example 1, except that the ratio of bamboo charcoal fiber to phosphorylated modified mulberry bark fiber is changed.

[0019] Example 3

[0020] This embodiment 3 presents a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions, which is prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts phosphorylated modified mulberry bark fiber, 8 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. The preparation method of the bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions in this embodiment is the same as that in Example 1, except that the amount of polyphenol-zinc chelate loaded on sodium alginate microcapsules changes.

[0021] Example 4

[0022] This embodiment 4 presents a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions, which is prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts phosphorylated modified mulberry bark fiber, 5 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. The preparation method of the bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions in this embodiment is the same as that in Example 1, except that the mass ratio of tea polyphenols to pomegranate peel tannins is changed to 7:3.

[0023] Comparative Example 1:

[0024] The cleaning cloth of Comparative Example 1 was prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts unphosphorylated and unmodified virgin mulberry bark fiber, 5 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. The cleaning cloth in this comparative example was prepared using the same method as in Example 1, except that unmodified raw mulberry bark fibers were used.

[0025] Comparative Example 2:

[0026] The cleaning cloth of Comparative Example 2 was prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts phosphorylated modified mulberry bark fiber, 5 parts polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. In this comparative example, the preparation method of the cleaning cloth is the same as that in Example 1. The polyphenol-zinc chelate is not encapsulated with sodium alginate microcapsules, step S3 is omitted, and the polyphenol-zinc chelate prepared in step S2 is directly mixed with other raw materials.

[0027] Comparative Example 3:

[0028] The cleaning cloth of Comparative Example 3 was prepared from the following raw materials in parts by weight: 68 parts bamboo charcoal fiber, 20 parts phosphorylated modified mulberry bark fiber, 5 parts tea polyphenol-zinc chelate loaded with sodium alginate microcapsules, 2 parts natural pyrethroid extract, and 3 parts β-cyclodextrin. In this comparative example, the preparation method of the cleaning cloth is the same as that in Example 1, except that a single tea polyphenol is used to prepare a polyphenol-zinc chelate.

[0029] Performance testing:

[0030] 1. Antibacterial performance test Perform the procedure according to GB / T 20944.3-2008. Cut 5 cm × 5 cm sterile samples from different cleaning cloth samples, with 3 parallel samples for each group. Simultaneously, prepare a blank control sample without antibacterial components. Place the samples in a sterile Erlenmeyer flask and add 1 × 10⁻⁶ antibacterial components. 5 -1×10 6 20 mL each of CFU / mL Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922) bacterial suspensions were placed in a constant temperature shaking incubator and cultured at 37℃ and 150 rpm for 24 h. After the culture, the number of viable bacteria in the bacterial suspension was determined by plate count method, and the antibacterial rate was calculated. Another set of the same sample was washed 200 times according to the AATCC 135 household washing procedure specified in GB / T 8629-2017. After drying, the shaking culture and viable bacteria counting steps were repeated, and the antibacterial rate after 200 washes was calculated.

[0031] Table 1. Antibacterial performance test data of different samples

[0032] The antibacterial rates against Staphylococcus aureus and Escherichia coli in all embodiments of this invention are ≥99.4% after 24 hours, and remain above 97.2% after 200 washes, significantly superior to the comparative examples without microencapsulation and containing only tea polyphenols. The synergistic effect of the complex polyphenol-zinc chelate and the microencapsulation sustained-release technology, combined with the interface strengthening effect of phosphorylation modification, effectively improve the antibacterial efficiency and long-lasting effect, solving the problem of poor wash resistance of traditional products.

[0033] 2. Antiviral performance test Performed according to T / CHC 2-2021, 2 cm × 2 cm sterile samples were cut from different cleaning cloth samples, with 3 parallel samples and a blank control sample without antiviral components set up for each group; the samples were spread flat in sterile petri dishes, and a concentration of 1×10⁻⁶ was added. 4 -1×10 5 TCID 50 0.2 mL of influenza virus (H1N1) suspension was applied to the sample surface using a sterile spreader, ensuring even coverage without excess liquid. The sample was then incubated at 25°C and 60% relative humidity for 2 hours. After incubation, 3 mL of MEM medium containing 2% fetal bovine serum was added to the culture dish, and the sample was shaken thoroughly for 10 minutes to elute the virus adsorbed on the sample surface. The eluent was collected and purified using TCID50. 50 Viral titer was determined using the half-maximal tissue culture infectious dose method. Another set of identical samples was washed 200 times according to the AATCC 135 household washing procedure specified in GB / T 8629-2017. After drying, the above virus contact, elution and titer determination steps were repeated to calculate the antiviral activity rate and verify the antiviral effect and long-term stability of the product.

[0034] Table 2. Antiviral performance test data of different samples

[0035] All embodiments showed an antiviral activity rate of ≥99.3% against influenza virus (H1N1) for 24 hours, and still reached over 98.1% after 200 washes, with Example 3 reaching the highest at 99.8%. The combination of the synergistic effect of compound polyphenols and microencapsulation technology achieved highly efficient and long-lasting antiviral function, significantly superior to the comparative examples, highlighting the core advantage of dual antibacterial and antiviral functions.

[0036] 3. Combined test of wash resistance and mechanical properties (1) Wash resistance: According to GB / T 8629-2017, 10 cm × 5 cm samples (3 warp and 3 weft) were cut from different cleaning cloth samples. The AATCC 135 washing program was used, with the washing temperature set at 40℃, liquor ratio at 1:30 and washing time at 15 min. 50 and 200 household washes were completed respectively. After each wash, the samples were naturally air-dried according to the program. The appearance of the samples was observed to be undamaged and without obvious deformation. (2) Mechanical properties: In accordance with GB / T 3923.1-2013, the fracture strength of unwashed samples, samples washed 50 times and 200 times was tested using a universal testing machine. The clamping distance was set to 200 mm and the tensile speed to 100 mm / min. The average values ​​of the warp and weft fracture strengths were recorded, and the strength retention rate after 50 washes was calculated.

[0037] Table 3. Test data on wash resistance of different samples

[0038] Table 4 Test data of mechanical properties of different samples

[0039] It can be seen from the above table: (1) The sample retained ≥93.4% of its strength after 50 washes and ≥89.4% after 200 washes, with only slight fuzzing and no damage after washing; the comparative and blank control samples showed significant attenuation and even damage. Phosphorylated modified mulberry bark fiber strengthens the interfacial bonding force of the fiber, and microencapsulation technology reduces component loss, greatly improving the product's wash resistance and durability; The unwashed average breaking strength of the sample was ≥14.9 cN / dtex, meeting the requirements of claim 13.5-16.0 cN / dtex. The attenuation after washing was small, remaining ≥13.4 cN / dtex after 200 cycles. Phosphorylation modification effectively enhanced the interfiber bonding force, giving the product both excellent structural strength and resistance to attenuation, superior to the unmodified and blank control samples.

[0040] 4. Anti-mite performance test According to GB / T 24253-2009, 3 cm × 3 cm samples were cut from different cleaning cloth samples, with 3 parallel samples and a blank control sample without anti-mite components in each group. A 9 cm diameter sterile petri dish was used, with a 2 mm thick layer of sterile absorbent cotton (soaked in sterile deionized water to maintain humidity) at the bottom of the petri dish. The sample was laid flat on top of the absorbent cotton and fixed. Fifty active house dust mites were placed in the center of the sample, and petroleum jelly was applied to the inner wall of the petri dish to prevent the mites from escaping. The petri dish was placed in a constant temperature and humidity incubator at 25℃ and 75% relative humidity for 24 h. After the incubation, the number of surviving mites on and around the sample surface was counted using a stereomicroscope, and the mite repellency rate was calculated. Another group of the same sample was washed 50 times according to the AATCC 135 household washing procedure specified in GB / T 8629-2017. After drying, the above incubation and counting steps were repeated to verify the long-term stability of the anti-mite performance.

[0041] Table 5. Test data on the anti-mite performance of different samples

[0042] In the example, the unwashed mite repellency rate was ≥96.9%, and remained ≥95.5% after 50 washes, significantly higher than the comparative sample and blank control without natural pyrethroids. The core function of natural pyrethroids, combined with the synergistic effects of modification and microencapsulation technology, ensures the high efficiency and long-lasting effect of the mite-preventing function, meeting the needs of household mite prevention.

[0043] 5. Security Testing The test was conducted in accordance with GB 18401-2010 Class A standard. Representative samples were cut from different cleaning cloth samples. For formaldehyde content testing, 10 g of shredded fiber sample was taken; for pH value testing, 2 g of shredded fiber sample was taken; and for decomposable carcinogenic aromatic amine dye testing, 5 g of shredded fiber sample was taken. Three parallel samples were set up for each group. The formaldehyde content was tested using the acetylacetone spectrophotometric method. The sample was mixed with deionized water at a bath ratio of 1:100 and shaken in a 40℃ water bath for 60 min. The supernatant was taken and reacted with acetylacetone reagent for color development. The absorbance was measured at a wavelength of 412 nm using a spectrophotometer. The formaldehyde content was calculated by referring to the standard curve. pH value testing was performed using the potentiometer method. The sample was mixed with deionized water at a bath ratio of 1:50, shaken at room temperature for 2 hours, and the pH value of the soaking solution was directly measured using a calibrated pH meter. The test for decomposable carcinogenic aromatic amine dyes is performed using high performance liquid chromatography (HPLC). The sample is extracted and reduced by citric acid buffer solution, and the target component is extracted with diethyl ether. After concentration and volume adjustment, the sample is injected into the HPLC instrument and compared with the standard for qualitative and quantitative analysis to verify whether the 23 specified decomposable carcinogenic aromatic amine dyes are detected. All test results must meet the requirements of GB18401-2010 Class A standard.

[0044] Table 6 Safety test data for different samples

[0045] All examples showed formaldehyde content ≤9.3mg / kg, pH value 6.2-6.5, and no detectable decomposable carcinogenic aromatic amine dyes, meeting the Class A standard of GB 18401-2010. All-natural ingredients and environmentally friendly processes ensure the product is safe, non-toxic, and non-irritating to the skin, suitable for home, medical, and other direct skin contact applications.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions, characterized in that, The cleaning cloth is prepared from the following raw materials in parts by weight: Bamboo charcoal fiber 60-75 parts, phosphorylated modified mulberry bark fiber 15-25 parts, sodium alginate microcapsule-loaded polyphenol-zinc chelate 3-8 parts, natural pyrethroid extract 1-3 parts, β-cyclodextrin 2-4 parts. The phosphorylated modified mulberry bark fiber is prepared by reacting with a 10%-15% phosphoric acid solution at 60°C for 2 hours; the sodium alginate microcapsules have a particle size of 5-10 μm and encapsulate a chelate formed by a complex of tea polyphenols and pomegranate peel tannins and zinc ions; the natural pyrethroid extract has a purity of 95%-99% and a molar ratio of 1:2 with zinc ions; the cleaning cloth has a broad-spectrum antibacterial rate of 95%-99% after 200 washes and a tensile strength of 13.5-16.0 CN / dtex.

2. The bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to claim 1, characterized in that, The mass ratio of bamboo charcoal fiber to phosphorylated modified mulberry bark fiber is 7:3-8:

2.

3. The bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to claim 1, characterized in that, The mass ratio of tea polyphenols to pomegranate peel tannins is 5:5-7:

3.

4. A method for preparing a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to any one of claims 1-3, characterized in that, The specific preparation steps are as follows: S1. Immerse mulberry bark fiber in 10%-15% phosphoric acid solution, react at 60℃ for 2 h, wash with water until neutral, and then dry to obtain phosphorylated modified mulberry bark fiber. S2. Mix tea polyphenols and pomegranate peel tannins at a mass ratio of 5:5-7:3, add 0.05-0.1 mol / L zinc ion solution, and react for 20-30 min at an ultrasonic power of 200-300 W and a temperature of 35-45℃ to form polyphenol-zinc chelates. S3. The chelate is dispersed in a 3%-5% sodium alginate solution and microcapsules with a particle size of 5-10 μm are prepared by high-voltage electrostatic spraying. The spraying voltage of the high-voltage electrostatic spraying method is 15-25 kV and the receiving distance is 10-15 cm. S4. Place bamboo charcoal fiber, phosphorylated modified mulberry bark fiber, microcapsules, natural pyrethroid extract, and β-cyclodextrin in a high-speed mixer and mix at 800-1200 rpm for 15-25 min. S5. The mixed fibers are woven and finished using a plain weave to obtain a bamboo charcoal fiber cleaning cloth; the setting temperature is 80-100℃ and the setting time is 10-15 min; the warp density of the weaving process is 200-220 threads / 10 cm and the weft density is 180-200 threads / 10 cm.

5. The method for preparing a bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to claim 4, characterized in that, The zinc ion solution in step S2 is either zinc sulfate solution or zinc chloride solution.

6. The bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to claim 1, characterized in that, The cleaning cloth has an antibacterial rate of 99.5%-99.9% against Staphylococcus aureus and Escherichia coli, an antiviral activity rate of 99%-99.8% against influenza virus, and a mite repellency rate of 90%-98%.

7. The bamboo charcoal fiber cleaning cloth with antibacterial and antiviral functions according to claim 1, characterized in that, The air permeability of the cleaning cloth is 800-1000 mm / s, and the strength retention rate is 92%-98% after 50 washes.

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