Antibacterial non-woven fabric and preparation method thereof

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to an antibacterial non-woven fabric and a preparation method thereof.A non-woven fabric base material is modified through dopamine hydrochloride, dopamine is subjected to an oxidation self-polymerization reaction, a polydopamine coating is formed on the surface of the non-woven fabric base material, and on the basis that the hydrophilic performance and the adhesion performance of the non-woven fabric are enhanced, the antibacterial property of the non-woven fabric is improved; a good substrate can be provided for subsequent antibacterial treatment; secondly, the non-woven fabric coated with the dopamine on the surface is immersed in a silver nitrate solution added with sepiolite, the antibacterial performance of the non-woven fabric can be further enhanced, the sepiolite can be adsorbed and fixed to the dopamine coating on the surface of the non-woven fabric, and silver ions ionized from silver nitrate can also be adsorbed and fixed by the sepiolite, so that the antibacterial performance of the non-woven fabric is improved; therefore, a sepiolite-dopamine composite coating containing silver ions can be formed on the surface of the non-woven fabric, and the composite coating not only has excellent performance of a dopamine coating, but also enables the non-woven fabric to have lasting antibacterial performance.

Description

Technical Field

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

[0002] With the increasing requirements for antibacterial properties of materials in the fields of medical treatment, health and daily life, the market demand for antibacterial non-woven fabrics, as an important functional material, has grown dramatically. Traditional non-woven fabrics are prone to breed bacteria during use, which not only affects the service life of the product, but also may cause health problems such as cross-infection. Moreover, with the improvement of medical standards and people's pursuit of healthy life, antibacterial non-woven fabrics are increasingly widely used in medical supplies (such as surgical gowns, masks, bandages, dressings, etc.). These products need to have efficient and lasting antibacterial properties to ensure the safety of patients and reduce the risk of nosocomial infections. Therefore, it is particularly important to develop non-woven materials with efficient and lasting antibacterial properties. However, most of the antibacterial non-woven fabrics on the market currently have problems such as non-persistent antibacterial effects, easy detachment of antibacterial agents, and environmental pollution.

[0003] In the existing antibacterial non-woven fabric preparation technology, a common method is to achieve the antibacterial effect by coating or soaking the non-woven fabric surface with an antibacterial agent. However, this method often has problems such as the antibacterial agent and the non-woven fabric are not firmly bonded, and the antibacterial effect is easily attenuated. Therefore, how to modify the existing non-woven fabric preparation method so that the non-woven fabric has stable and non-attenuating antibacterial properties has become a technical problem that needs to be urgently solved by technicians in this field. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an antibacterial non-woven fabric and a preparation method thereof, which can effectively solve the problem that the antibacterial performance of the non-woven fabric in the prior art is unstable and easily attenuated.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A method for preparing an antibacterial nonwoven fabric, the preparation method comprising:

[0009] S1, treating cotton fiber with pectinase and amylase to obtain enzymatically hydrolyzed cotton fiber, and then modifying the enzymatically hydrolyzed cotton fiber with a silane coupling agent to prepare modified cotton fiber;

[0010] S2, mixing the modified cotton fiber and polypropylene to prepare a non-woven fabric base material by melt-blowing;

[0011] S3. The non-woven fabric base material is subjected to preliminary antibacterial modification with dopamine hydrochloride, and then immersed in a silver nitrate modified solution containing antibacterial sepiolite for secondary antibacterial modification, and the resulting non-woven fabric is an antibacterial non-woven fabric.

[0012] Furthermore, in S1, the specific steps of enzyme treatment are:

[0013] Step 2.1, weigh 0.1 g pectinase and 0.1 g amylase, pour into 1 L deionized water, and disperse them ultrasonically at a frequency of 23 kHz for 10 min. The result is recorded as the enzymatic solution component;

[0014] Step 2.2, add 100g cotton fiber to the enzymatic hydrolyzate component, ultrasonically oscillate at a power of 200W for 20min, and then place it in a 50℃ water bath for enzymatic hydrolysis for 1h. After the enzymatic hydrolysis is completed, filter out the cotton fiber, rinse it three times with deionized water, and then dry it in an oven at 65℃ for 3-5h to obtain the enzymatic hydrolyzed cotton fiber.

[0015] Furthermore, in S1, the preparation steps of the modified cotton fiber are:

[0016] Step 3.1, dissolve 3-5g of silane coupling agent KH-550 in 100mL of deionized water, stir at a stirring speed of 500r / min for 10min, and record the result as the modified solution;

[0017] Step 3.2, weigh 10-12g of enzymatically hydrolyzed cotton fiber and disperse it in the modified solution in step 3.1, stir and react in a water bath at 60°C, filter and remove the filtrate, and then dry to obtain the modified cotton fiber.

[0018] Furthermore, in step 3.2, the specific operation of the stirring reaction is stirring at a stirring speed of 200 r / min for 1 hour, and the specific operation of the drying treatment is placing in an oven at 65° C. for drying for 4-5 hours.

[0019] Furthermore, in S3, the specific steps of the preliminary antibacterial modification are:

[0020] Step 5.1, adding dopamine hydrochloride solution to an equal volume of Tris solution, adding hydrochloric acid solution dropwise to adjust the pH value to 8.5-8.8, and the resultant is recorded as dopamine buffer solution;

[0021] Step 5.2: completely immerse the non-woven fabric base material in the dopamine buffer solution, seal it and place it in a constant temperature water bath shaker at 30°C and 100 r / min to react for 24 hours. After taking it out, rinse it once with deionized water. After drying, the preliminary antibacterial modification is completed.

[0022] Furthermore, in step 5.1, the concentration of dopamine hydrochloride solution is 0.02 mol / L, the concentration of Tris solution is 10 mol / L, and the concentration of hydrochloric acid solution is 1 mol / L. In step 5.2, the specific operation of the drying treatment is to place it in an oven at 60° C. and dry it for 30 minutes.

[0023] Furthermore, in S3, the preparation steps of antibacterial sepiolite are:

[0024] The sepiolite was dispersed in a 6 mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 g / mL, modified in a 50°C water bath for 1 hour and then aged for 24 hours. It was washed three times with deionized water and dried in an oven at 80°C for 2 hours. It was then placed in a muffle furnace for thermal modification at 600°C for 1 hour. After cooling to room temperature, it was ground through a 200-mesh sieve to obtain the antibacterial sepiolite.

[0025] Furthermore, in S3, the preparation step of the silver nitrate modified solution is: weigh 15-20g of antibacterial sepiolite and disperse it in 1L of silver nitrate solution with a concentration of 0.03mol / L, and ultrasonically disperse it at a frequency of 26kHz for 10min to obtain the silver nitrate modified solution.

[0026] Furthermore, in S3, the specific steps of the secondary antibacterial modification are:

[0027] The non-woven fabric base material that has undergone preliminary antibacterial modification is completely immersed in the silver nitrate modification solution, sealed and placed in a constant temperature water bath shaker at 30°C and 100r / min to react for 24 hours, taken out and rinsed with deionized water three times, and then placed in an oven at 60°C to dry for 4-5 hours, and the resulting antibacterial non-woven fabric is obtained.

[0028] An antibacterial nonwoven fabric is prepared by a method for preparing the antibacterial nonwoven fabric.

[0029] Beneficial Effects

[0030] The present invention provides an antibacterial nonwoven fabric and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention removes impurities from cotton fibers by a combination of pectinase and amylase, and can specifically decompose impurities such as pectin and starch in cotton fibers. Compared with traditional chemical impurity removal methods, biological enzyme treatment is more gentle, can reduce fiber damage, and improve impurity removal efficiency; secondly, the cotton fibers after enzymatic hydrolysis are modified by a silane coupling agent, one end of the silane coupling agent can chemically react with functional groups such as hydroxyl groups on the surface of the cotton fibers to form stable chemical bonds, and the other end can produce physical or chemical adsorption with polypropylene molecular chains, thereby building a "bridge" between the cotton fibers and polypropylene. This chemical bonding action significantly enhances the interfacial bonding force between the two, making it difficult for the cotton fibers to fall off or aggregate in the polypropylene matrix, thereby improving the overall stability of the composite material, and the modified cotton fibers can be more evenly dispersed in the polypropylene matrix to form a more dense network structure. This uniform dispersion state is conducive to the effective transmission of stress in the composite material, thereby improving the overall mechanical properties of the material.

[0032] 2. The present invention modifies the non-woven fabric base material with dopamine hydrochloride, so that dopamine undergoes an oxidative self-polymerization reaction to form a polydopamine coating on the surface of the non-woven fabric base material. On the basis of enhancing the hydrophilicity and adhesion properties of the non-woven fabric, it can also provide a good substrate for subsequent antibacterial treatment; secondly, immersing the non-woven fabric with dopamine coated on the surface in a silver nitrate solution containing sepiolite can further enhance the antibacterial properties of the non-woven fabric. The sepiolite can be adsorbed and fixed on the dopamine coating on the surface of the non-woven fabric, and the silver ions ionized by silver nitrate can also be adsorbed and fixed by the sepiolite, thereby forming a sepiolite-dopamine composite coating containing silver ions on the surface of the non-woven fabric. This composite coating not only has the excellent properties of the dopamine coating, but also can make the non-woven fabric have lasting antibacterial properties. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] Example 1

[0036] The present embodiment provides a method for preparing an antibacterial nonwoven fabric, the preparation method comprising:

[0037] S1. Enzymatically treating cotton fiber with pectinase and amylase to obtain enzymatically hydrolyzed cotton fiber, and then modifying the enzymatically hydrolyzed cotton fiber with a silane coupling agent to prepare modified cotton fiber.

[0038] The specific steps of enzyme treatment are:

[0039] Step 2.1, weigh 0.1 g pectinase and 0.1 g amylase, pour into 1 L deionized water, and disperse them ultrasonically at a frequency of 23 kHz for 10 min. The result is recorded as the enzymatic solution component;

[0040] Step 2.2, add 100g cotton fiber to the enzymatic hydrolyzate component, ultrasonically oscillate at a power of 200W for 20min, and then place it in a 50℃ water bath for enzymatic hydrolysis for 1h. After the enzymatic hydrolysis is completed, filter out the cotton fiber, rinse it three times with deionized water, and then dry it in an oven at 65℃ for 3h to obtain the enzymatic hydrolyzed cotton fiber.

[0041] The preparation steps of modified cotton fiber are:

[0042] Step 3.1, dissolving 3 g of silane coupling agent KH-550 in 100 mL of deionized water, stirring at a stirring speed of 500 r / min for 10 min, and the resulting solution was recorded as a modified solution;

[0043] Step 3.2: Weigh 10 g of enzymatically hydrolyzed cotton fiber and disperse it in the modified solution in step 3.1. Stir it in a water bath at 60°C at a stirring speed of 200 r / min for 1 h. After filtering out the filtrate, dry it in an oven at 65°C for 4 h to obtain the modified cotton fiber.

[0044] S2. The modified cotton fiber and polypropylene are mixed and prepared into a non-woven fabric base material by a melt-blowing method.

[0045] S3. The non-woven fabric base material is subjected to preliminary antibacterial modification with dopamine hydrochloride, and then immersed in a silver nitrate modified solution containing antibacterial sepiolite for secondary antibacterial modification, and the resulting non-woven fabric is an antibacterial non-woven fabric.

[0046] Among them, the specific steps of preliminary antibacterial modification are:

[0047] Step 5.1, adding a 0.02 mol / L dopamine hydrochloride solution to an equal volume of a 10 mol / L Tris solution, and adding a 1 mol / L hydrochloric acid solution dropwise to adjust the pH value to 8.5, the resultant is recorded as dopamine buffer;

[0048] Step 5.2: completely immerse the non-woven fabric base material in the dopamine buffer solution, seal it and place it in a constant temperature water bath shaker at 30°C and 100 r / min to react for 24 hours. After taking it out, rinse it once with deionized water and dry it in an oven at 60°C for 30 minutes to complete the preliminary antibacterial modification.

[0049] The preparation steps of antibacterial sepiolite are:

[0050] The sepiolite was dispersed in a 6 mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 g / mL, modified in a 50°C water bath for 1 hour and then aged for 24 hours. It was washed three times with deionized water and dried in an oven at 80°C for 2 hours. It was then placed in a muffle furnace for thermal modification at 600°C for 1 hour. After cooling to room temperature, it was ground through a 200-mesh sieve to obtain the antibacterial sepiolite.

[0051] The preparation steps of the silver nitrate modified solution are as follows: weigh 15g of antibacterial sepiolite and disperse it in 1L of a silver nitrate solution with a concentration of 0.03mol / L, and ultrasonically disperse it at a frequency of 26kHz for 10min to obtain the silver nitrate modified solution.

[0052] The specific steps of secondary antibacterial modification are:

[0053] The non-woven fabric base material that has undergone preliminary antibacterial modification is completely immersed in the silver nitrate modification solution, sealed and placed in a constant temperature water bath shaker at 30°C and 100r / min to react for 24 hours, taken out and rinsed with deionized water three times, and then placed in an oven at 60°C to dry for 4 hours, and the result is an antibacterial non-woven fabric.

[0054] An antibacterial nonwoven fabric is prepared by a method for preparing the antibacterial nonwoven fabric.

[0055] Example 2

[0056] The present embodiment provides a method for preparing an antibacterial nonwoven fabric, the preparation method comprising:

[0057] S1. Enzymatically treating cotton fiber with pectinase and amylase to obtain enzymatically hydrolyzed cotton fiber, and then modifying the enzymatically hydrolyzed cotton fiber with a silane coupling agent to prepare modified cotton fiber.

[0058] The specific steps of enzyme treatment are:

[0059] Step 2.1, weigh 0.1 g pectinase and 0.1 g amylase, pour into 1 L deionized water, and disperse them ultrasonically at a frequency of 23 kHz for 10 min. The result is recorded as the enzymatic solution component;

[0060] Step 2.2, add 100g cotton fiber to the enzymatic hydrolyzate component, ultrasonically oscillate at a power of 200W for 20min, and then place it in a 50℃ water bath for enzymatic hydrolysis for 1h. After the enzymatic hydrolysis is completed, filter out the cotton fiber, rinse it three times with deionized water, and then dry it in an oven at 65℃ for 5h. The result is the enzymatic hydrolyzed cotton fiber.

[0061] The preparation steps of modified cotton fiber are:

[0062] Step 3.1, dissolve 5 g of silane coupling agent KH-550 in 100 mL of deionized water, and stir at a stirring speed of 500 r / min for 10 min to obtain a modified solution;

[0063] Step 3.2: Weigh 12 g of enzymatically hydrolyzed cotton fiber and disperse it in the modified solution in step 3.1. Stir it in a water bath at 60°C at a stirring speed of 200 r / min for 1 h. Filter the filtrate and dry it in an oven at 65°C for 5 h. The result is the modified cotton fiber.

[0064] S2. The modified cotton fiber and polypropylene are mixed and prepared into a non-woven fabric base material by a melt-blowing method.

[0065] S3. The non-woven fabric base material is subjected to preliminary antibacterial modification with dopamine hydrochloride, and then immersed in a silver nitrate modified solution containing antibacterial sepiolite for secondary antibacterial modification, and the resulting non-woven fabric is an antibacterial non-woven fabric.

[0066] Among them, the specific steps of preliminary antibacterial modification are:

[0067] Step 5.1, adding a 0.02 mol / L dopamine hydrochloride solution to an equal volume of a 10 mol / L Tris solution, and adding a 1 mol / L hydrochloric acid solution dropwise to adjust the pH value to 8.8, the resultant is recorded as dopamine buffer;

[0068] Step 5.2: completely immerse the non-woven fabric base material in the dopamine buffer solution, seal it and place it in a constant temperature water bath shaker at 30°C and 100 r / min to react for 24 hours. After taking it out, rinse it once with deionized water and dry it in an oven at 60°C for 30 minutes to complete the preliminary antibacterial modification.

[0069] The preparation steps of antibacterial sepiolite are:

[0070] The sepiolite was dispersed in a 6 mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 g / mL, modified in a 50°C water bath for 1 hour and then aged for 24 hours. It was washed three times with deionized water and dried in an oven at 80°C for 2 hours. It was then placed in a muffle furnace for thermal modification at 600°C for 1 hour. After cooling to room temperature, it was ground through a 200-mesh sieve to obtain the antibacterial sepiolite.

[0071] The preparation steps of the silver nitrate modified solution are as follows: weigh 20g of antibacterial sepiolite and disperse it in 1L of silver nitrate solution with a concentration of 0.03mol / L, and ultrasonically disperse it at a frequency of 26kHz for 10min to obtain the silver nitrate modified solution.

[0072] The specific steps of secondary antibacterial modification are:

[0073] The non-woven fabric base material that has undergone preliminary antibacterial modification is completely immersed in the silver nitrate modification solution, sealed and placed in a constant temperature water bath shaker at 30°C and 100r / min to react for 24 hours, taken out and rinsed with deionized water three times, and then placed in an oven at 60°C to dry for 5 hours, and the resulting antibacterial non-woven fabric is obtained.

[0074] An antibacterial nonwoven fabric is prepared by a method for preparing the antibacterial nonwoven fabric.

[0075] Example 3

[0076] The present embodiment provides a method for preparing an antibacterial nonwoven fabric, the preparation method comprising:

[0077] S1. Enzymatically treating cotton fiber with pectinase and amylase to obtain enzymatically hydrolyzed cotton fiber, and then modifying the enzymatically hydrolyzed cotton fiber with a silane coupling agent to prepare modified cotton fiber.

[0078] The specific steps of enzyme treatment are:

[0079] Step 2.1, weigh 0.1 g pectinase and 0.1 g amylase, pour into 1 L deionized water, and disperse them ultrasonically at a frequency of 23 kHz for 10 min. The result is recorded as the enzymatic solution component;

[0080] Step 2.2, add 100g cotton fiber to the enzymatic hydrolyzate component, ultrasonically oscillate at a power of 200W for 20min, and then place it in a 50℃ water bath for enzymatic hydrolysis for 1h. After the enzymatic hydrolysis is completed, filter out the cotton fiber, rinse it three times with deionized water, and then dry it in an oven at 65℃ for 4h to obtain the enzymatic hydrolyzed cotton fiber.

[0081] The preparation steps of modified cotton fiber are:

[0082] Step 3.1, dissolving 4 g of silane coupling agent KH-550 in 100 mL of deionized water, stirring at a stirring speed of 500 r / min for 10 min, and the resulting solution was recorded as a modified solution;

[0083] Step 3.2: Weigh 11 g of enzymatically hydrolyzed cotton fiber and disperse it in the modified solution in step 3.1. Stir it in a water bath at 60°C at a stirring speed of 200 r / min for 1 h. Filter the filtrate and dry it in an oven at 65°C for 4 h to obtain the modified cotton fiber.

[0084] S2. The modified cotton fiber and polypropylene are mixed and prepared into a non-woven fabric base material by a melt-blowing method.

[0085] S3. The non-woven fabric base material is subjected to preliminary antibacterial modification with dopamine hydrochloride, and then immersed in a silver nitrate modified solution containing antibacterial sepiolite for secondary antibacterial modification, and the resulting non-woven fabric is an antibacterial non-woven fabric.

[0086] Among them, the specific steps of preliminary antibacterial modification are:

[0087] Step 5.1, adding a 0.02 mol / L dopamine hydrochloride solution to an equal volume of a 10 mol / L Tris solution, and adding a 1 mol / L hydrochloric acid solution dropwise to adjust the pH value to 8.7, the resultant is recorded as dopamine buffer;

[0088] Step 5.2: completely immerse the non-woven fabric base material in the dopamine buffer solution, seal it and place it in a constant temperature water bath shaker at 30°C and 100 r / min to react for 24 hours. After taking it out, rinse it once with deionized water and dry it in an oven at 60°C for 30 minutes to complete the preliminary antibacterial modification.

[0089] The preparation steps of antibacterial sepiolite are:

[0090] The sepiolite was dispersed in a 6 mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 g / mL, modified in a 50°C water bath for 1 hour and then aged for 24 hours. It was washed three times with deionized water and dried in an oven at 80°C for 2 hours. It was then placed in a muffle furnace for thermal modification at 600°C for 1 hour. After cooling to room temperature, it was ground through a 200-mesh sieve to obtain the antibacterial sepiolite.

[0091] The preparation steps of the silver nitrate modified solution are as follows: weigh 18g of antibacterial sepiolite and disperse it in 1L of a silver nitrate solution with a concentration of 0.03mol / L, and ultrasonically disperse it at a frequency of 26kHz for 10min to obtain the silver nitrate modified solution.

[0092] The specific steps of secondary antibacterial modification are:

[0093] The non-woven fabric base material that has undergone preliminary antibacterial modification is completely immersed in the silver nitrate modification solution, sealed and placed in a constant temperature water bath shaker at 30°C and 100r / min to react for 24 hours, taken out and rinsed with deionized water three times, and then placed in an oven at 60°C to dry for 5 hours, and the resulting antibacterial non-woven fabric is obtained.

[0094] An antibacterial nonwoven fabric is prepared by a method for preparing the antibacterial nonwoven fabric.

[0095] Comparative Example 1

[0096] The antibacterial non-woven fabric and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that in this comparative example 1, the modified cotton fiber in Example 1 is replaced with enzymatically hydrolyzed cotton fiber.

[0097] Comparative Example 2

[0098] The antibacterial non-woven fabric and its preparation method provided in this comparative example are substantially the same as those in Example 1, with the main difference being that this comparative example 2 removes the primary antibacterial modification of S3 in Example 1 and directly performs secondary antibacterial modification on the non-woven fabric base material.

[0099] Comparative Example 3

[0100] The antibacterial non-woven fabric and the preparation method thereof provided in this comparative example are substantially the same as those in Example 1, with the main difference being that the antibacterial sepiolite in Example 1 is replaced with deionized water in this comparative example 3.

[0101] Performance Testing

[0102] The antibacterial nonwoven fabrics in Examples 1-3 and Comparative Examples 1-3 are marked as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2 and Comparative Example 3, respectively. Then, the performance of Examples 1-3 and Comparative Examples 1-3 is tested. The specific testing method is as follows:

[0103] 1. The water contact angles of Examples 1-3 and Comparative Examples 1-3 were measured using a JGW-360 fully automatic optical contact angle meter, and the obtained data are recorded in the following table;

[0104] 2. The antibacterial rates of Examples 1-3 and Comparative Examples 1-3 were measured with reference to GB / T20944.3-2008 "Evaluation of Antibacterial Properties of Textiles (Part 3): Oscillation Method", and the antibacterial rates of Examples 1-3 and Comparative Examples 1-3 were measured after rinsing 100 times and 500 times, respectively. The antibacterial rates were calculated according to the following formula:

[0105] Antibacterial rate (%) = (A0-A1) / A0×100%

[0106] Where: A0 represents the colony count of the blank control sample after 24 hours of culture,

[0107] A1 represents the number of colonies after 24 hours of culture of the antibacterial finishing sample.

[0108] The colonies were cultured in a DH3600 constant temperature incubator, and the data obtained are recorded in the table below.

[0109]

[0110] It can be seen from the data in the above table that the hygroscopicity of the antibacterial non-woven fabrics in Examples 1-3 is significantly better than that in Comparative Example 1, indicating that the modification of the enzymatically hydrolyzed cotton fibers by a silane coupling agent can improve the hygroscopicity of the non-woven fabric base material; secondly, the antibacterial rate of the antibacterial non-woven fabrics in Examples 1-3 is significantly better than that in Comparative Examples 2-3, indicating that the preliminary antibacterial modification of the non-woven fabric base material and the addition of antibacterial sepiolite to the silver nitrate solution can significantly improve the antibacterial properties of the non-woven fabric. In summary, the antibacterial non-woven fabric prepared by the present invention has stable antibacterial properties and has excellent application prospects in the field of antibacterial non-woven fabrics.

[0111] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will 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 method for preparing an antibacterial nonwoven fabric, characterized in that: The preparation method is: S1, treating cotton fiber with pectinase and amylase to obtain enzymatically hydrolyzed cotton fiber, and then modifying the enzymatically hydrolyzed cotton fiber with a silane coupling agent to prepare modified cotton fiber; S2, mixing the modified cotton fiber and polypropylene to prepare a non-woven fabric base material by melt-blowing; S3. The non-woven fabric base material is subjected to preliminary antibacterial modification with dopamine hydrochloride, and then immersed in a silver nitrate modified solution containing antibacterial sepiolite for secondary antibacterial modification, and the resulting non-woven fabric is an antibacterial non-woven fabric.

2. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S1, the specific steps of enzyme treatment are: Step 2.1, weigh 0.1 g pectinase and 0.1 g amylase, pour into 1 L deionized water, and disperse them ultrasonically at a frequency of 23 kHz for 10 min. The result is recorded as the enzymatic solution component; Step 2.2, add 100g cotton fiber to the enzymatic hydrolyzate component, ultrasonically oscillate at a power of 200W for 20min, and then place it in a 50℃ water bath for enzymatic hydrolysis for 1h. After the enzymatic hydrolysis is completed, filter out the cotton fiber, rinse it three times with deionized water, and then dry it in an oven at 65℃ for 3-5h to obtain the enzymatic hydrolyzed cotton fiber.

3. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S1, the preparation steps of modified cotton fiber are: Step 3.1, dissolve 3-5g of silane coupling agent KH-550 in 100mL of deionized water, stir at a stirring speed of 500r / min for 10min, and record the result as the modified solution; Step 3.2, weigh 10-12g of enzymatically hydrolyzed cotton fiber and disperse it in the modified solution in step 3.1, stir and react in a water bath at 60°C, filter and remove the filtrate, and then dry to obtain the modified cotton fiber.

4. The method for preparing an antibacterial nonwoven fabric according to claim 3, characterized in that: In step 3.2, the specific operation of the stirring reaction is stirring at a stirring speed of 200 r / min for 1 hour, and the specific operation of the drying treatment is placing in an oven at 65° C. and drying for 4-5 hours.

5. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S3, the specific steps of the preliminary antibacterial modification are: Step 5.1, adding dopamine hydrochloride solution to an equal volume of Tris solution, adding hydrochloric acid solution dropwise to adjust the pH value to 8.5-8.8, and the resultant is recorded as dopamine buffer solution; Step 5.2: completely immerse the non-woven fabric base material in the dopamine buffer solution, seal it and place it in a constant temperature water bath shaker at 30°C and 100 r / min to react for 24 hours. After taking it out, rinse it once with deionized water. After drying, the preliminary antibacterial modification is completed.

6. The method for preparing an antibacterial nonwoven fabric according to claim 5, characterized in that: In step 5.1, the concentration of dopamine hydrochloride solution is 0.02 mol / L, the concentration of Tris solution is 10 mol / L, and the concentration of hydrochloric acid solution is 1 mol / L. In step 5.2, the specific operation of the drying treatment is to place it in an oven at 60° C. and dry it for 30 minutes.

7. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S3, the preparation steps of antibacterial sepiolite are: The sepiolite was dispersed in a 6 mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 g / mL, modified in a 50°C water bath for 1 hour and then aged for 24 hours. It was washed three times with deionized water and dried in an oven at 80°C for 2 hours. It was then placed in a muffle furnace for thermal modification at 600°C for 1 hour. After cooling to room temperature, it was ground through a 200-mesh sieve to obtain the antibacterial sepiolite.

8. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S3, the preparation steps of the silver nitrate modified solution are: weigh 15-20g of antibacterial sepiolite and disperse it in 1L of silver nitrate solution with a concentration of 0.03mol / L, and ultrasonically disperse it at a frequency of 26kHz for 10min to obtain the silver nitrate modified solution.

9. The method for preparing an antibacterial nonwoven fabric according to claim 1, characterized in that: In S3, the specific steps of the secondary antibacterial modification are: The non-woven fabric base material that has undergone preliminary antibacterial modification is completely immersed in the silver nitrate modification solution, sealed and placed in a constant temperature water bath shaker at 30°C and 100r / min to react for 24 hours, taken out and rinsed with deionized water three times, and then placed in an oven at 60°C to dry for 4-5 hours, and the resulting antibacterial non-woven fabric is obtained.

10. An antibacterial nonwoven fabric, characterized in that: The antibacterial nonwoven fabric is prepared by the method for preparing the antibacterial nonwoven fabric according to any one of claims 1 to 9.

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