Antiviral polypropylene nonwoven fabric and preparation method thereof

Abstract

The present invention provides an antiviral polypropylene nonwoven fabric and a preparation method thereof. The method comprises placing a polypropylene nonwoven fabric under a preset temperature for heat treatment, so that the polypropylene nonwoven fabric is softened and a micro-melting phenomenon occurs; placing the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution, and using the temperature of the polypropylene nonwoven fabric to realize in-situ synthesis of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, hot pressing is performed to obtain the antiviral polypropylene nonwoven fabric. Through the above method, the present invention can utilize the physical properties of the polypropylene nonwoven fabric to cause a micro-melting phenomenon on its surface after heat treatment, so as to load antiviral nanoparticles, thereby making the antiviral nanoparticles uniformly loaded and tightly bonded to the polypropylene fibers without destroying the performance of the polypropylene nonwoven fabric itself, giving the polypropylene nonwoven fabric excellent antiviral performance and biocompatibility, so as to meet the needs of actual production and application.

Description

Technical Field

[0001] The invention relates to the technical field of post-processing of polypropylene nonwoven fabrics, and in particular to an antiviral polypropylene nonwoven fabric and a preparation method thereof. Background Art

[0002] Polypropylene meltblown nonwoven fabric is a common raw material for disposable medical supplies and is widely used in the preparation of medical masks, protective clothing and other products. In recent years, with the increase in demand for medical protection, there are higher requirements for the functionality of polypropylene nonwoven fabrics. How to make polypropylene nonwoven fabrics have better antiviral effects has become an urgent problem to be solved.

[0003] However, since polypropylene nonwoven fabrics contain only two elements, carbon and oxygen, and have an extremely regular chemical structure, polypropylene nonwoven fabrics have very stable properties, are not easily dissolved in common solvents, and are difficult to effectively modify.

[0004] The patent with publication number CN113925240A provides an antibacterial and antiviral mask and a preparation method thereof. The patent sequentially immerses the melt-blown nonwoven fabric in an alkaline solution, a copper source solution and a reducing solution after pretreatment, controls its liquid carrying rate, and finally places it in a solvent reaction medium. In a high temperature environment, nano cuprous oxide is synthesized by in-situ reaction, thereby preparing a melt-blown nonwoven fabric modified by nano cuprous oxide. Although the method provided by the patent can load and fix nano cuprous oxide to the inside and outside of the melt-blown nonwoven fabric through in-situ reaction to a certain extent, so as to achieve the antibacterial and antiviral effect, it needs to be impregnated multiple times during the preparation process, and the impregnation conditions and the liquid carrying rate of the nonwoven fabric need to be controlled during each impregnation treatment. The preparation process is relatively cumbersome, and the pretreatment solution and alkaline solution used in the impregnation process will also cause certain damage to the structure and performance of the nonwoven fabric itself; and the patent arranges the impregnated melt-blown nonwoven fabric in a high-temperature solvent reaction medium for in-situ reaction, and only relies on the grooves on the fiber surface to fix the synthesized nano cuprous oxide, and the bonding strength still needs to be strengthened.

[0005] In view of this, it is necessary to design an improved antiviral polypropylene nonwoven fabric and a preparation method thereof to solve the above problems. Summary of the invention

[0006] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide an antiviral polypropylene non-woven fabric and a preparation method thereof. The physical properties of the polypropylene non-woven fabric are utilized to heat-treat the polypropylene non-woven fabric near the melting temperature of polypropylene to cause micro-melting on its surface to load antiviral nanoparticles, thereby giving the polypropylene non-woven fabric excellent antiviral properties without destroying the properties of the polypropylene non-woven fabric itself.

[0007] To achieve the above object, the present invention provides a method for preparing an antiviral polypropylene nonwoven fabric, comprising the following steps:

[0008] S1, heat-treating the polypropylene nonwoven fabric at a preset temperature to soften the polypropylene nonwoven fabric and produce a micro-melting phenomenon;

[0009] S2, placing the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution, and using the temperature of the polypropylene nonwoven fabric to perform one-step in-situ synthesis loading of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, a polypropylene nonwoven fabric loaded with nanoparticles is obtained;

[0010] S3. Performing heat pressing treatment on the polypropylene nonwoven fabric loaded with nanoparticles to obtain an antiviral polypropylene nonwoven fabric.

[0011] As a further improvement of the present invention, in step S1, the temperature difference between the preset temperature and the melting temperature of polypropylene does not exceed 50°C; preferably, the preset temperature is 140-240°C.

[0012] As a further improvement of the present invention, in step S2, the antiviral treatment solution is one or a mixture of titanium dioxide sol, cuprous oxide sol, and cuprous oxide hybrid titanium dioxide solution.

[0013] As a further improvement of the present invention, the concentration of the titanium dioxide sol is 1% to 10%; the titanium dioxide sol is prepared by the following method:

[0014] Adding tetrabutyl titanate into anhydrous ethanol and mixing them evenly to obtain a first solution;

[0015] Add glacial acetic acid and deionized water into anhydrous ethanol, mix well, and adjust the pH to 1.5-3 to obtain a second solution;

[0016] The first solution is added to the second solution, stirred for 20 to 40 minutes in a water bath at 30 to 50° C., and then kept warm for 1.5 to 2.5 hours to obtain a titanium dioxide sol.

[0017] As a further improvement of the present invention, the concentration of the cuprous oxide sol is 1% to 10%; the cuprous oxide sol is prepared by the following method:

[0018] Under a nitrogen atmosphere, anhydrous methanol and lithium are mixed evenly and reacted fully to obtain lithium methoxide;

[0019] Mixing a methanol solution of copper chloride with the lithium methoxide to obtain copper methoxide after sufficient reaction;

[0020] The copper methoxide is placed in ethylene glycol methyl ether, acetic acid is added to dissolve the copper methoxide in the ethylene glycol methyl ether, and then a glucose aqueous solution is added to obtain a cuprous oxide sol after sufficient reaction.

[0021] As a further improvement of the present invention, the concentration of the cuprous oxide hybrid titanium dioxide solution is 1% to 10%, wherein the mass ratio of cuprous oxide to titanium dioxide is 1:9 to 9:1; the cuprous oxide hybrid titanium dioxide solution is prepared by the following method:

[0022] Dispersing titanium dioxide in deionized water, and stirring ultrasonically at room temperature to obtain a titanium dioxide dispersion;

[0023] Disodium ethylenediaminetetraacetate is added to the titanium dioxide dispersion, and then placed in a water bath at 30-50° C. for reaction for 2-4 hours, and then CuSO4·5H2O is added. After reacting for 20-40 minutes, 1.0-2.0 mol / L NaOH solution and 0.05-0.15 mol / L ascorbic acid aqueous solution are added in sequence. After sufficient reaction, a cuprous oxide hybrid titanium dioxide solution is obtained.

[0024] As a further improvement of the present invention, in step S3, the temperature of the hot pressing treatment is 160-180° C., and the time of the hot pressing treatment is 3-10 minutes.

[0025] As a further improvement of the present invention, in step S1, the polypropylene nonwoven fabric is also pre-treated before the heat treatment; the pre-treatment method includes: washing the polypropylene nonwoven fabric in a neutral detergent for 20 to 40 minutes, and then drying it in an environment of 40 to 80°C.

[0026] To achieve the above objectives, the present invention also provides an antiviral polypropylene nonwoven fabric, which is prepared according to any of the above technical solutions, and includes a polypropylene nonwoven fabric and antiviral nanoparticles loaded in the polypropylene nonwoven fabric.

[0027] As a further improvement of the present invention, the loading amount of the antiviral nanoparticles is 1% to 5%.

[0028] The beneficial effects of the present invention are:

[0029] 1. The preparation method of the antiviral polypropylene nonwoven fabric provided by the present invention can make the polypropylene surface slightly melted by heat-treating the polypropylene nonwoven fabric near the melting temperature of polypropylene, and will not affect the performance of the polypropylene itself; under this condition, the heat-treated polypropylene nonwoven fabric is immediately immersed in the antiviral treatment solution, which can not only use the high temperature on the surface of the polypropylene nonwoven fabric to provide temperature conditions for the in-situ synthesis of nanoparticles, but also make the solvent in the antiviral treatment solution close to the surface of the nonwoven fabric evaporate quickly, and promote the rapid loading of nanoparticles on the slightly melted surface of the polypropylene nonwoven fabric. During the soaking process, the temperature on the surface of the polypropylene nonwoven fabric gradually decreases until it reaches equilibrium with the sol temperature, and the nanoparticles synthesized in situ and loaded on the surface of the polypropylene nonwoven fabric are also effectively fixed as the surface of the polypropylene nonwoven fabric cools down. After the soaking treatment, hot pressing treatment is performed again, which can further promote the close bonding between the polypropylene fiber and the antiviral nanoparticles, so that it has a strong interface bonding ability.

[0030] 2. The present invention prepares titanium dioxide sol, cuprous oxide sol, and cuprous oxide hybrid titanium dioxide solution as antiviral treatment liquids, and controls the concentration of the treatment liquids, thereby enabling the precursors of nanoparticles to be fully dispersed in the sols. When the heat-treated polypropylene nonwoven fabric is immersed, the precursors can be uniformly polymerized on the polypropylene nonwoven fabric, thereby improving the uniformity of the antiviral nanoparticles loaded on the polypropylene nonwoven fabric, thereby improving the antiviral effect.

[0031] 3. The preparation method of the antiviral polypropylene nonwoven fabric provided by the present invention is based on an immersion in-situ synthesis method. It only needs to immerse the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution to achieve one-step in-situ synthesis and loading, and the entire preparation process only requires one immersion, which greatly simplifies the process flow and will not damage the performance of the polypropylene nonwoven fabric itself. The antiviral polypropylene nonwoven fabric finally obtained can still maintain excellent antiviral effect and biocompatibility under the condition of low antiviral nanoparticle loading, effectively meeting the needs of actual production and application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below in conjunction with specific embodiments.

[0033] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] The present invention provides a method for preparing an antiviral polypropylene nonwoven fabric, comprising the following steps:

[0035] S1, heat-treating the polypropylene nonwoven fabric at a preset temperature to soften the polypropylene nonwoven fabric and produce a micro-melting phenomenon;

[0036] S2, placing the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution, and using the temperature of the polypropylene nonwoven fabric to perform one-step in-situ synthesis loading of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, a polypropylene nonwoven fabric loaded with nanoparticles is obtained;

[0037] S3. Performing heat pressing treatment on the polypropylene nonwoven fabric loaded with nanoparticles to obtain an antiviral polypropylene nonwoven fabric.

[0038] Before the heat treatment of the polypropylene nonwoven fabric, a pretreatment may be performed; the pretreatment method includes: washing the polypropylene nonwoven fabric in a neutral detergent for 20 to 40 minutes, and then drying it at 40 to 80° C. to obtain a clean polypropylene nonwoven fabric.

[0039] In step S1, the preset temperature is controlled near the melting temperature of polypropylene, and the temperature difference between the preset temperature and the melting temperature of polypropylene does not exceed 50°C, which can cause micro-melting on the surface of polypropylene without affecting the performance of the polypropylene itself; preferably, the preset temperature is 140-240°C.

[0040] In step S2, the antiviral treatment liquid is a mixture of one or more of titanium dioxide sol, cuprous oxide sol, and cuprous oxide hybrid titanium dioxide solution. Preferably, the concentration of the titanium dioxide sol is 1% to 10%, the concentration of the cuprous oxide sol is 1% to 10%, the concentration of the cuprous oxide hybrid titanium dioxide solution is 1% to 10%, and the mass ratio of cuprous oxide to titanium dioxide in the cuprous oxide hybrid titanium dioxide solution is 1:9 to 9:1. By regulating the concentration of the antiviral nanoparticle precursor in the antiviral treatment liquid, it is beneficial to promote the precursor to be fully dispersed in the sol, and when the heat-treated polypropylene nonwoven fabric is immersed, the precursor can be uniformly polymerized on the polypropylene nonwoven fabric to improve the uniformity of the antiviral nanoparticles loaded on the polypropylene nonwoven fabric, thereby improving the antiviral effect.

[0041] Specifically, the titanium dioxide sol is prepared by the following method:

[0042] Adding tetrabutyl titanate into anhydrous ethanol and mixing them evenly to obtain a first solution;

[0043] Add glacial acetic acid and deionized water into anhydrous ethanol, mix well, and adjust the pH to 1.5-3 to obtain a second solution;

[0044] The first solution is added to the second solution, stirred for 20 to 40 minutes in a water bath at 30 to 50° C., and then kept warm for 1.5 to 2.5 hours to obtain a titanium dioxide sol.

[0045] The cuprous oxide sol is prepared by the following method:

[0046] Under a nitrogen atmosphere, anhydrous methanol and lithium are mixed evenly and reacted fully to obtain lithium methoxide;

[0047] Mixing a methanol solution of copper chloride with the lithium methoxide to obtain copper methoxide after sufficient reaction;

[0048] The copper methoxide is placed in ethylene glycol methyl ether, acetic acid is added to dissolve the copper methoxide in the ethylene glycol methyl ether, and then a glucose aqueous solution is added to obtain a cuprous oxide sol after sufficient reaction.

[0049] The cuprous oxide hybrid titanium dioxide solution is prepared by the following method:

[0050] Dispersing titanium dioxide in deionized water, and stirring ultrasonically at room temperature to obtain a titanium dioxide dispersion;

[0051] Disodium ethylenediaminetetraacetate is added to the titanium dioxide dispersion, and then placed in a water bath at 30-50° C. for reaction for 2-4 hours, and then CuSO4·5H2O is added. After reacting for 20-40 minutes, 1.0-2.0 mol / L NaOH solution and 0.05-0.15 mol / L ascorbic acid aqueous solution are added in sequence. After sufficient reaction, a cuprous oxide hybrid titanium dioxide solution is obtained.

[0052] In step S3, the temperature of the hot pressing treatment is 160-180° C., and the time of the hot pressing treatment is 3-10 minutes. Through the hot pressing treatment, the close bonding between the polypropylene fiber and the antiviral nanoparticles can be further promoted, so that the polypropylene fiber has a strong interface bonding ability, and the antiviral nanoparticles are prevented from falling off during use.

[0053] The present invention also provides an antiviral polypropylene nonwoven fabric, which is prepared according to the above technical solution and comprises a polypropylene nonwoven fabric and antiviral nanoparticles loaded in the polypropylene nonwoven fabric.

[0054] In the antiviral polypropylene nonwoven fabric, the loading amount of the antiviral nanoparticles is 1% to 5%. Since the antiviral nanoparticles are uniformly loaded and firmly bonded in the polypropylene nonwoven fabric, even under the condition of low loading amount of the antiviral nanoparticles, excellent antiviral effect and biocompatibility can still be achieved.

[0055] The antiviral polypropylene nonwoven fabric and the preparation method thereof provided by the present invention are specifically described below in conjunction with embodiments and comparative examples.

[0056] Example 1

[0057] This embodiment provides a method for preparing an antiviral polypropylene nonwoven fabric, comprising the following steps:

[0058] S1. The polypropylene nonwoven fabric is washed in a neutral detergent for 30 minutes, and then dried at 60° C. for 2 hours to obtain a clean polypropylene nonwoven fabric; the clean polypropylene nonwoven fabric is placed at 220° C. and heat treated for 15 minutes, and the polypropylene nonwoven fabric softens and produces a micro-melting phenomenon.

[0059] S2. Prepare titanium dioxide sol as an antiviral treatment liquid, immediately place the polypropylene nonwoven fabric after heat treatment in step S1 in the titanium dioxide sol, and use the high temperature of the polypropylene nonwoven fabric to achieve one-step in-situ synthesis loading of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, dry it to obtain the polypropylene nonwoven fabric loaded with nanoparticles.

[0060] Wherein, the preparation method of titanium dioxide sol is:

[0061] At room temperature, 10 mL of tetrabutyl titanate was slowly dripped into 35 mL of anhydrous ethanol, mixed evenly, and a yellow clear solution was formed to obtain the first solution; 4 mL of glacial acetic acid and 10 mL of deionized water were added to another 35 mL of anhydrous ethanol, mixed evenly, and then 1-2 drops of hydrochloric acid were added to adjust the pH to 3 to obtain the second solution. Next, the first solution was slowly added to the second solution to obtain a light yellow solution, and the solution was stirred for 30 min in a water bath at 40 ° C. After being kept warm for 2 h, a white gel solution was obtained, which was a titanium dioxide sol, and the mass concentration of the precursor in the sol was 10%.

[0062] S3. The nanoparticle-loaded polypropylene nonwoven fabric obtained in step S2 is subjected to hot pressing at 170° C. for 5 min to obtain an antiviral polypropylene nonwoven fabric.

[0063] The antiviral effect and ultraviolet absorption rate of the antiviral polypropylene nonwoven fabric prepared in this embodiment were tested. Taking the H1N1 influenza virus as an example, the antiviral activity rate was measured to be 95.58%, and the ultraviolet absorption rate was 85%.

[0064] Embodiment 2-3

[0065] Embodiments 2 to 3 respectively provide a method for preparing an antiviral polypropylene nonwoven fabric. Compared with Embodiment 1, the difference is that the antiviral treatment solution used in step S2 is different. The remaining steps are consistent with Embodiment 1 and are not repeated here.

[0066] The antiviral treatment solution used in Example 2 is cuprous oxide sol, and its preparation method is as follows:

[0067] Under a nitrogen atmosphere, 50 mL of anhydrous methanol and 50 g of lithium with a purity of 99.9% are mixed evenly, and lithium methoxide is obtained after sufficient reaction; a methanol solution of copper chloride is reacted with lithium methoxide to obtain copper methoxide. Further, 10 g of copper methoxide is placed in 40 mL of ethylene glycol methyl ether, 5 mL of acetic acid is added to dissolve the copper methoxide in the ethylene glycol methyl ether, and 45 mL of glucose aqueous solution (concentration of 10%) is added to generate a uniform and transparent light blue solution, which is cuprous oxide sol, and the mass concentration of the precursor in the sol is 10%.

[0068] The antiviral treatment solution used in Example 3 is a cuprous oxide hybrid titanium dioxide solution, and its preparation method is as follows:

[0069] First, 8 g of titanium dioxide was dispersed in 200 mL of deionized water and ultrasonically stirred at room temperature for 30 min. Subsequently, 8 g of disodium ethylenediaminetetraacetate was slowly added to the titanium dioxide dispersion, and the formed reaction system was placed in a water bath and reacted at 40 ° C for 3 h. Then, 8 g of CuSO4·5H2O was added, and the reaction was continued for 30 min. Then, 3 mL of 1.5 mol / L NaOH solution was added, and finally 2 mL of 0.1 mol / L ascorbic acid aqueous solution was added. The reaction was further continued for 1 h and kept warm at 40 ° C to obtain a cuprous oxide hybrid titanium dioxide solution in which the mass concentration of the precursor was 10%.

[0070] The performance of the antiviral polypropylene nonwoven fabrics prepared in Example 2 and Example 3 was tested, and the results showed that the antiviral activity rates were 95.86% and 96.01%, and the ultraviolet absorption rates were 90% and 95%, respectively.

[0071] Examples 4-5 and Comparative Examples 1-2

[0072] Examples 4 to 5 and Comparative Examples 1 to 2 respectively provide a method for preparing an antiviral polypropylene nonwoven fabric. Compared with Example 1, the difference is that the temperature of the heat treatment in step S1 is changed, and the remaining steps and parameters are consistent with Example 1, which are not repeated here. The corresponding heat treatment temperatures in each embodiment and comparative example and the performance parameters of the antiviral polypropylene nonwoven fabric obtained are shown in Table 1.

[0073] Table 1 Heat treatment temperature and product performance in Examples 3-4 and Comparative Examples 1-2

[0074]

[0075] It can be seen from Table 1 that within a certain range, the higher the heat treatment temperature, the greater the loading amount of nanoparticles. As the amount of nanoparticles increases, the antiviral performance of the fabric is enhanced, and its anti-ultraviolet performance is gradually enhanced. When the heat treatment temperature reaches 300°C in Comparative Example 2, although the loading amount and antiviral activity rate of the nanoparticles can be increased, the heat treatment temperature is too high, which will directly cause thermal degradation of the polypropylene nonwoven fabric substrate, which is not conducive to its practical application. Therefore, the preferred heat treatment temperature range is 140-240°C.

[0076] Comparative Example 3

[0077] Comparative Example 3 provides a method for preparing an antiviral polypropylene nonwoven fabric. Compared with Example 1, the difference is that the polypropylene nonwoven fabric is not heat-treated, but the polypropylene nonwoven fabric is fully immersed in a titanium dioxide sol and then placed in a dimethyl silicone oil solvent at 220°C for reaction, titanium dioxide nanoparticles are generated in situ, and a polypropylene nonwoven fabric loaded with nanoparticles is obtained; then, the same hot pressing treatment as Example 1 is performed to obtain an antiviral polypropylene nonwoven fabric.

[0078] The performance of the antiviral polypropylene non-woven fabric prepared in this comparative example was tested, and the antiviral activity rate was measured to be 99.9%, and the ultraviolet absorption rate was 88%, which was slightly improved compared with Example 1. This is because the specific heat capacity of dimethyl silicone oil is relatively large. During the self-assembly process, the loading amount of the nanoparticles is slightly increased, which improves its relative antiviral activity and anti-ultraviolet performance. However, dimethyl silicone oil has extremely strong permeability. There is no way to completely remove it after the non-woven fabric is treated with dimethyl silicone oil. Moreover, dimethyl silicone oil, as a liquid with hydrophobic properties, will further enhance the hydrophobic properties of the polypropylene non-woven fabric, which is not conducive to water permeability, moisture permeability and air permeability, and affects the application of the obtained polypropylene non-woven fabric product.

[0079] Comparative Example 4

[0080] Comparative Example 4 provides a method for preparing an antiviral polypropylene nonwoven fabric. Compared with Example 1, the difference is that the hot pressing treatment in step S3 is not performed, and the remaining steps are consistent with Example 1 and are not repeated here.

[0081] The performance of the antiviral polypropylene nonwoven fabric prepared in this comparative example was tested, and its antiviral activity rate was measured to be 90.12%, and the ultraviolet absorption rate was 79%. The test results were compared with those in Example 1. The results showed that the fabric that had not been subjected to heat pressing treatment had a great influence on its antiviral and anti-ultraviolet properties because the unreinforced nanoparticles were not tightly bound to the surface of the polypropylene fiber.

[0082] In summary, the present invention provides an antiviral polypropylene nonwoven fabric and a preparation method thereof. The method comprises placing a polypropylene nonwoven fabric under a preset temperature for heat treatment, so that the polypropylene nonwoven fabric softens and produces a micro-melting phenomenon; placing the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution, and using the temperature of the polypropylene nonwoven fabric to realize the in-situ synthesis of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, hot pressing is performed to obtain an antiviral polypropylene nonwoven fabric. Through the above method, the present invention can utilize the physical properties of the polypropylene nonwoven fabric to cause a micro-melting phenomenon on its surface after heat treatment, so as to load antiviral nanoparticles, thereby making the antiviral nanoparticles uniformly loaded and tightly bonded to the polypropylene fibers without destroying the performance of the polypropylene nonwoven fabric itself, giving the polypropylene nonwoven fabric excellent antiviral performance and biocompatibility, so as to meet the needs of actual production and application.

[0083] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing an antiviral polypropylene nonwoven fabric, characterized in that: The steps include: S1, heat-treating the polypropylene nonwoven fabric at a preset temperature to soften the polypropylene nonwoven fabric and produce a micro-melting phenomenon; the preset temperature is 220° C.; S2, placing the heat-treated polypropylene nonwoven fabric in an antiviral treatment solution, and using the temperature of the polypropylene nonwoven fabric to perform one-step in-situ synthesis loading of nanoparticles; after the temperature of the polypropylene nonwoven fabric drops to room temperature, a polypropylene nonwoven fabric loaded with nanoparticles is obtained; the antiviral treatment solution is one or a mixture of titanium dioxide sol, cuprous oxide sol, and cuprous oxide hybrid titanium dioxide solution; S3. Performing heat pressing treatment on the polypropylene nonwoven fabric loaded with nanoparticles to obtain an antiviral polypropylene nonwoven fabric.

2. The method for preparing the antiviral polypropylene nonwoven fabric according to claim 1, characterized in that: The concentration of the titanium dioxide sol is 1% to 10%; the titanium dioxide sol is prepared by the following method: Adding tetrabutyl titanate into anhydrous ethanol and mixing them evenly to obtain a first solution; Add glacial acetic acid and deionized water to anhydrous ethanol, mix well, and adjust the pH to 1.5-3 to obtain a second solution; The first solution is added to the second solution, stirred for 20 to 40 minutes in a water bath at 30 to 50° C., and then kept warm for 1.5 to 2.5 hours to obtain a titanium dioxide sol.

3. The method for preparing the antiviral polypropylene nonwoven fabric according to claim 1, characterized in that: The concentration of the cuprous oxide sol is 1% to 10%; the cuprous oxide sol is prepared by the following method: Under a nitrogen atmosphere, anhydrous methanol and lithium are mixed evenly and reacted fully to obtain lithium methoxide; Mixing a methanol solution of copper chloride with the lithium methoxide to obtain copper methoxide after sufficient reaction; The copper methoxide is placed in ethylene glycol methyl ether, acetic acid is added to dissolve the copper methoxide in the ethylene glycol methyl ether, and then a glucose aqueous solution is added to obtain a cuprous oxide sol after sufficient reaction.

4. The method for preparing the antiviral polypropylene nonwoven fabric according to claim 1, characterized in that: The concentration of the cuprous oxide hybrid titanium dioxide solution is 1% to 10%, wherein the mass ratio of cuprous oxide to titanium dioxide is 1:9 to 9:1; the cuprous oxide hybrid titanium dioxide solution is prepared by the following method: Dispersing titanium dioxide in deionized water, and stirring ultrasonically at room temperature to obtain a titanium dioxide dispersion; Disodium ethylenediaminetetraacetate is added to the titanium dioxide dispersion, and then placed in a water bath at 30-50° C. for reaction for 2-4 hours, and then CuSO4·5H2O is added. After reacting for 20-40 minutes, 1.0-2.0 mol / L NaOH solution and 0.05-0.15 mol / L ascorbic acid aqueous solution are added in sequence. After sufficient reaction, a cuprous oxide hybrid titanium dioxide solution is obtained.

5. The method for preparing the antiviral polypropylene nonwoven fabric according to claim 1, characterized in that: In step S3, the temperature of the hot pressing treatment is 160-180° C., and the time of the hot pressing treatment is 3-10 minutes.

6. The method for preparing the antiviral polypropylene nonwoven fabric according to claim 1, characterized in that: In step S1, the polypropylene nonwoven fabric is pre-treated before the heat treatment; the pre-treatment method includes: washing the polypropylene nonwoven fabric in a neutral detergent for 20-40 minutes, and then drying it in an environment of 40-80°C.

7. An antiviral polypropylene nonwoven fabric, characterized in that: The method according to any one of claims 1 to 6 comprises a polypropylene nonwoven fabric and antiviral nanoparticles loaded in the polypropylene nonwoven fabric.

8. The antiviral polypropylene nonwoven fabric according to claim 7, characterized in that: The loading amount of the antiviral nanoparticles is 1% to 5%.

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