Preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver

Abstract

The application relates to the field of materials, in particular to a preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver. The method comprises the following steps: S1, ultrasonic cleaning of the non-woven fabric with anhydrous ethanol and deionized water in sequence, and then drying in an oven to obtain pretreated non-woven fabric; S2, moving an antibacterial liquid into a polyethylene bottle, then immersing the obtained pretreated non-woven fabric into the antibacterial liquid, and then stirring in a magnetic stirrer; S3, after the stirred polyethylene bottle is placed in an oven for heating reaction, the non-woven fabric is taken out, repeatedly washed with deionized water, and then dried; S4, repeating steps S2 and S3 for 1-5 times to obtain the biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver. The biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver prepared by the application has the advantages of environmental friendliness, simple preparation, broad-spectrum antibacterial property, high-efficiency sterilization, excellent super-hydrophobic property, long-term antibacterial capacity and skin friendliness, and can be applied in the medical field.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of materials, in particular to a preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver. BACKGROUND

[0002] Non-woven fabric (also known as non-woven cloth) is composed of oriented or random fibers, has the characteristics of air permeability, moisture resistance, flexibility, light weight, non-combustibility, etc., and is used in various fields. In the process of use, the surface of the non-woven fabric is prone to bacterial growth, and the bacteria can adhere for a long time and cannot be killed, so it is very important to further modify the non-woven fabric. Nano-modified non-woven fabric is a technical means to make it have excellent antibacterial performance. Among various nano materials, nano-silver has been proven to have excellent bactericidal ability against almost all bacteria. When used, nano-silver is loaded into the non-woven fabric, which can effectively prevent the agglomeration of nano-silver, and the silver nano-antibacterial non-woven fabric can inherit the excellent performance of silver, and after direct contact with the human skin, it can help the skin resist bacterial invasion and inhibit bacterial growth, thereby achieving the effect of antibacterial and bacteriostatic.

[0003] The preparation of traditional silver-loaded non-woven fabric mainly adopts machine preparation method and textile material treatment method. The machine preparation method needs high-cost equipment and complex technology to process, including electrospinning method, plasma treatment method, etc. The textile material treatment method usually needs to use extremely flammable and explosive reducing agents (such as sodium borohydride, hydrazine hydrate, etc.), which reduces silver nanoparticles to the textile material through immersion or coating, etc. to change the performance of the fabric surface.

[0004] Therefore, the defects of the existing preparation technology are that it is not simple and low-cost to load nano-silver onto textiles, and extremely flammable and explosive substances are often used in the preparation process, which is not conducive to environmental protection and has low safety. In addition, the surface roughness of the material prepared by the existing method cannot achieve the super-hydrophobic effect, and it does not have the properties of stain resistance and corrosion resistance. Therefore, a new preparation method of biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver needs to be developed to overcome the above-mentioned shortcomings. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver. The biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver prepared by the present application has the advantages of long-lasting antibacterial property, washing resistance and excellent hydrophobicity. In addition, the preparation method of the biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver of the present application is simple, safe and environmentally friendly, low in cost, and suitable for large-scale industrial production and market application.

[0006] The present application provides a preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver, which adopts the following technical scheme:

[0007] A method for preparing a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric, comprising the following steps:

[0008] S1, the non-woven fabric is sequentially cleaned by ultrasonic with anhydrous ethanol and deionized water, and then dried in an oven to obtain a pretreated non-woven fabric;

[0009] S2, the antibacterial liquid is moved into a polyethylene bottle, the obtained pretreated non-woven fabric is then immersed in the antibacterial liquid, and the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is then placed in a magnetic stirrer for stirring;

[0010] S3, the stirred polyethylene bottle is placed in an oven for heating reaction, and after the reaction is completed, the non-woven fabric is taken out, washed repeatedly with deionized water, and then dried;

[0011] S4, steps S2 and S3 are repeated for 1-5 times to obtain a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric.

[0012] By adopting the above technical solution, in step S1, the non-woven fabric is cleaned by ultrasonic with anhydrous ethanol and deionized water, and then dried to remove water. The non-woven fabric has no extra interfering substances, and the nano-silver is more easily loaded on the non-woven fabric. In step S2, the addition of the surfactant can make the nano-silver more uniformly loaded on the non-woven fabric, and can also improve the bonding force between the nano-silver and the non-woven fabric. In step S3, silver nitrate and sodium citrate grow nano-silver in situ on the non-woven fabric by a hydrothermal method to generate silver nanocolloid. The specific reaction process is as follows: sodium citrate Na3C6H5O7 is hydrolyzed in water to generate citric acid trianion C6H5O7 3- and sodium ion Na + . Silver nitrate AgNO3 is dissociated in water to generate silver ion Ag + and nitrate ion NO3 - . The citric acid trianion reacts with the silver ion to form a silver citrate complex. The silver citrate complex is further decomposed and reduced under heating conditions to generate silver nanocolloid. In step S3, the use of a magnetic stirrer for stirring can make the antibacterial liquid more uniformly mixed with the non-woven fabric, and then the use of deionized water for washing can further ensure the complete removal of chemicals, and drying can remove water. In step S4, by repeatedly performing steps S2 and S3 for 1-5 times, the loading rate of nano-silver on the non-woven fabric is enhanced, thereby improving the antibacterial performance of the modified non-woven fabric, increasing the roughness of the non-woven fabric, and improving the hydrophobic angle of the non-woven fabric. Through the above steps, the nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric prepared by the present application has the advantages of environmental friendliness, simple preparation, broad-spectrum antibacterial, high-efficiency sterilization, excellent super-hydrophobic characteristics, long-term antibacterial ability, and skin friendliness, and can be widely applied in medical fields and other fields.

[0013] Preferably, in step S1, the non-woven fabric is ultrasonically cleaned with anhydrous ethanol and deionized water for 30 minutes, and the ultrasonic frequency is 60-100 kHz.

[0014] Preferably, in step S1, the drying process is carried out at a temperature of 40-60°C for 1-3 hours.

[0015] Preferably, in step S2, the antibacterial solution comprises the following raw materials with the following mass concentrations: silver nitrate 0.15-0.57 g / L, sodium citrate 30-35 g / L, and surfactant 0.05-0.07 g / L.

[0016] Preferably, the surfactant is one or more of polyethylene glycol, polyvinylpyrrolidone, and sodium alginate. Polyethylene glycol (PEG) P81561 1-500 g, CAS: 25322-68-3, Shanghai Maikelin Biochemical Technology Co., Ltd., average molecular weight 60 kDa; polyvinylpyrrolidone (PVP) P11060 7-100 g, CAS: 9003-39-8, Shanghai Aladdin Biochemical Technology Co., Ltd., average molecular weight 58 kDa, K29-32.

[0017] Preferably, the surfactant is a combination of polyethylene glycol, polyvinylpyrrolidone, and sodium alginate in a mass ratio of 2:(10-15):3.

[0018] By using the above technical solution, in step S2, the antibacterial solution comprises silver nitrate, sodium citrate, and a surfactant. Specifically, silver nitrate mainly provides silver ions. The surfactant enhances the wettability of the solution, making it easier for the solution to penetrate into the non-woven fabric and helping the uniform distribution of nano-silver particles on the non-woven fabric. The surfactant has the following effects in this application: providing wettability of the solution: the surfactant has the ability to reduce the surface tension of the liquid, making it easier for the antibacterial solution to wet the surface of the non-woven fabric, promoting the contact and adsorption of silver ions in the antibacterial solution with the non-woven fabric. Promoting uniform distribution: through the action of the surfactant, the dispersibility of nano-silver particles in the solution can be enhanced, making them uniformly distributed on the non-woven fabric, thereby achieving overall antibacterial and super-hydrophobic properties. Enhancing adhesion: the surfactant can increase the interaction between the antibacterial solution and the non-woven fabric, making the nano-silver particles more firmly attached to the surface of the non-woven fabric, improving the stability and durability of the antibacterial effect. The surfactant can be one or more of polyethylene glycol, polyvinylpyrrolidone, and sodium alginate, or a combination thereof. In this application, a combination of polyethylene glycol, polyvinylpyrrolidone, and sodium alginate in a mass ratio of 2:(10-15):3 is chosen as the surfactant. Such a combination can better exert the effects of wettability, dispersibility, and adhesion, further improving the antibacterial and super-hydrophobic properties of the non-woven fabric.

[0019] Preferably, in step S2, the preparation method of the antibacterial solution is as follows: first, prepare silver nitrate solution with a concentration of 0.45-1.7 g / L, sodium citrate solution with a concentration of 90-105 g / L, and surfactant solution with a concentration of 0.15-0.21 g / L using ultrapure water, respectively; then, slowly introduce 1 part of the sodium citrate solution into 1 part of the silver nitrate solution using a glass rod, mix well, obtain a mixed solution, and then add 1 part of the surfactant solution to the mixed solution, mix well, and obtain the antibacterial solution.

[0020] Preferably, in step S2, the stirring process conditions are as follows: the stirring speed is 200 r / min, and the time is 10-50 min.

[0021] Preferably, in step S3, the heating reaction process conditions include a temperature of 95℃ and a time of 1-2 h.

[0022] By adopting the above technical solution, in step S3, the heating reaction process conditions include a temperature of 95℃ and a time of 1-2 h. Such heating conditions play the following roles in the present application: promoting the formation of silver nanoparticles: heating reaction can provide sufficient heat energy to promote the reaction of silver nitrate and sodium citrate in the antibacterial solution to generate silver nanoparticles. Appropriate heating temperature can improve the reaction rate and yield. Promoting the fixation of silver nanoparticles on the non-woven fabric: during the heating process, silver nanoparticles have high migration rate and diffusion capacity, can better penetrate into the interior of the non-woven fabric, and are fixed in the fiber gap to achieve antibacterial and hydrophobic effects. Improving the dispersibility of silver nanoparticles: during heating, due to the flow of liquid and the volatilization of solvent, silver nanoparticles can be better distributed uniformly on the non-woven fabric, improving its antibacterial and super-hydrophobic properties. The choice of heating temperature of 95℃ is to avoid deformation of the non-woven fabric and damage to heat-sensitive materials, because when the temperature exceeds 100℃, the non-woven fabric will gradually soften and deform. Therefore, the temperature of 95℃ can maintain appropriate heating effect while avoiding the adverse effects of the non-woven fabric. The heating time of 1-2 hours can make full use of time to make the reaction reach the ideal state.

[0023] Preferably, in step S3, the drying process conditions are as follows: the temperature is 60℃, and the time is 1-3 h.

[0024] In summary, the beneficial technical effects of the present application are as follows:

[0025] 1. Environmentally friendly preparation method: the present application uses hydrothermal method to grow silver nanoparticles in situ on the surface of non-woven fabric, which is simple in process and friendly to the environment, and is conducive to large-scale production and market application of silver nanoparticle modified non-woven fabric.

[0026] 2. Broad-spectrum antibacterial performance: Nano-silver has broad-spectrum antibacterial and high-efficiency bactericidal performance, which is effective in inhibiting various bacteria and does not depend on special light conditions, and can be widely used in different application fields. The antibacterial performance of Escherichia coli and Staphylococcus aureus reaches more than 99.9%.

[0027] 3. Excellent super-hydrophobic properties: The non-woven fabric modified by nano-silver has excellent super-hydrophobic properties, and the contact angle with water can reach 155°±5°. When the surface contacts water, it has a high contact angle, good waterproof, self-cleaning and pollution protection ability.

[0028] 4. Persistent hydrophobicity and antibacterial ability: After 50 times of washing, the nano-silver modified non-woven fabric still has excellent antibacterial ability and good persistent performance, which is suitable for long-term use and multiple washing application scenarios.

[0029] 5. Low toxicity and low irritation: By adding trace amounts of silver nitrate and sodium citrate to modify the non-woven fabric, the modified non-woven fabric will not cause toxic reactions and irritation when in contact with the skin for a long time, and is safe and reliable for the human body.

[0030] 6. Wide application field: The preparation method is suitable for preparing non-woven fabric materials for medical purposes such as wound dressings, adhesive bandages, and antibacterial masks, as well as materials with antibacterial and hydrophobic properties in other fields. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. If the specific conditions are not specified in the examples, they are carried out under conventional conditions or according to the manufacturer's recommendations. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market, polyethylene glycol, PEG, P815611-500g, CAS: 25322-68-3, Shanghai Maikelin Biochemical Technology Co., Ltd., average molecular weight 60kDa, polyvinylpyrrolidone, PVP, P110607-100g, CAS: 9003-39-8, Shanghai Aladdin Biochemical Technology Co., Ltd., average molecular weight 58kDa, K29-32.

[0032] Example 1

[0033] A preparation method of a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver, comprising the following steps:

[0034] S1, the non-woven fabric is sequentially cleaned with anhydrous ethanol and deionized water for 30 min under ultrasonic frequency of 60 kHz, and then dried in a 40°C oven for 3h to obtain a pretreated non-woven fabric;

[0035] S2, the antibacterial liquid is moved into a polyethylene bottle, the obtained pretreated non-woven fabric is immersed in the polyethylene bottle, and then the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is placed in a magnetic stirrer for stirring at a speed of 200 r / min for 10 min;

[0036] S3, the stirred polyethylene bottle is placed in an oven for heating to 95 DEG C for 1 h, and then the non-woven fabric is taken out, washed repeatedly with deionized water, and dried at 60 DEG C for 1 h;

[0037] S4, steps S2 and S3 are repeated for 1 time, and a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric is obtained.

[0038] In step S2, the antibacterial liquid comprises the following raw materials with mass concentrations: silver nitrate 0.15 g / L, sodium citrate 30 g / L, and polyethylene glycol 0.05 g / L.

[0039] In step S2, the antibacterial liquid is prepared by first preparing a 0.45 / L silver nitrate solution, a 90 g / L sodium citrate solution, and a 0.15 g / L polyethylene glycol solution with ultrapure water, respectively, then slowly introducing 0.1 L of the sodium citrate solution into 0.1 L of the silver nitrate solution with a glass rod according to the volume ratio, mixing uniformly to obtain a mixed solution, and then adding 0.1 L of the polyethylene glycol solution into the mixed solution and mixing uniformly to obtain the antibacterial liquid.

[0040] Example 2

[0041] A method for preparing a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric comprises the following steps:

[0042] S1, the non-woven fabric is ultrasonically cleaned with anhydrous ethanol and deionized water for 30 min, the ultrasonic frequency is 100 kHz, and then the non-woven fabric is placed in a 60 DEG C oven for drying for 1 h to obtain a pretreated non-woven fabric;

[0043] S2, the antibacterial liquid is moved into a polyethylene bottle, the obtained pretreated non-woven fabric is immersed in the polyethylene bottle, and then the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is placed in a magnetic stirrer for stirring at a speed of 200 r / min for 50 min;

[0044] S3, the stirred polyethylene bottle is placed in an oven for heating to 95 DEG C for 2 h, and then the non-woven fabric is taken out, washed repeatedly with deionized water, and dried at 60 DEG C for 3 h;

[0045] S4, steps S2 and S3 are repeated for 5 times, and a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric is obtained.

[0046] In step S2, the antibacterial liquid comprises the following raw materials with the following mass concentrations: silver nitrate 0.57 g / L, sodium citrate 35 g / L, and polyvinylpyrrolidone 0.07 g / L.

[0047] In step S2, the antibacterial liquid is prepared by first preparing a silver nitrate solution with a concentration of 1.7 g / L, a sodium citrate solution with a concentration of 105 g / L, and a polyvinylpyrrolidone solution with a concentration of 0.21 g / L using ultrapure water, respectively. Then, 0.1 L of the sodium citrate solution is slowly introduced into 0.1 L of the silver nitrate solution using a glass rod, and the mixture is uniformly mixed. Finally, 0.1 L of the polyvinylpyrrolidone solution is added to the mixture, and the mixture is uniformly mixed to obtain the antibacterial liquid.

[0048] Example 3

[0049] A method for preparing a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric includes the following steps:

[0050] S1, the non-woven fabric is sequentially cleaned with anhydrous ethanol and deionized water for 30 minutes under ultrasonic frequency of 80 kHz, and then dried in a 50℃ oven for 2 hours to obtain a pretreated non-woven fabric;

[0051] S2, the antibacterial liquid is moved into a polyethylene bottle, and the obtained pretreated non-woven fabric is immersed therein. Then, the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is placed in a magnetic stirrer for stirring at a speed of 200 r / min for 30 minutes;

[0052] S3, the stirred polyethylene bottle is placed in an oven for heating to 95℃ for 1.5 hours. After the reaction is completed, the non-woven fabric is repeatedly washed with deionized water and dried at a temperature of 60℃ for 2 hours.

[0053] S4, steps S2 and S3 are repeated for 3 times to obtain a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric.

[0054] In step S2, the antibacterial liquid comprises the following raw materials with the following mass concentrations: silver nitrate 0.30 g / L, sodium citrate 33 g / L, and sodium alginate 0.06 g / L.

[0055] In step S2, the antibacterial liquid is prepared by first preparing a silver nitrate solution with a concentration of 0.9 g / L, a sodium citrate solution with a concentration of 99 g / L, and a sodium alginate solution with a concentration of 0.18 g / L using ultrapure water, respectively. Then, 0.1 L of the sodium citrate solution is slowly introduced into 0.1 L of the silver nitrate solution using a glass rod, and the mixture is uniformly mixed. Finally, 0.1 L of the sodium alginate solution is added to the mixture, and the mixture is uniformly mixed to obtain the antibacterial liquid.

[0056] Example 4

[0057] A method for preparing a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric, comprising the following steps:

[0058] S1, the non-woven fabric is sequentially cleaned with anhydrous ethanol and deionized water for 30 minutes under ultrasonic frequency of 80 kHz, and then dried in a 50℃ oven for 2 hours to obtain a pretreated non-woven fabric;

[0059] S2, the antibacterial liquid is moved into a polyethylene bottle, the obtained pretreated non-woven fabric is then immersed therein, and then the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is placed in a magnetic stirrer for stirring at a speed of 200 r / min for 30 minutes;

[0060] S3, the stirred polyethylene bottle is placed in an oven for heating to 95℃ for 1.5 hours, and after the reaction is completed, the non-woven fabric is taken out, repeatedly washed with deionized water, and then dried at a temperature of 60℃ for 2 hours;

[0061] S4, steps S2 and S3 are repeated for 3 times to obtain a nano-silver-based biomimetic super-hydrophobic antibacterial non-woven fabric.

[0062] In step S2, the antibacterial liquid comprises the following raw materials with mass concentrations: silver nitrate 0.3 g / L, sodium citrate 33 g / L, and a surfactant 0.06 g / L, wherein the surfactant is a composition of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2:10:3.

[0063] In step S2, the preparation method of the antibacterial liquid is as follows: first, 0.9 g / L silver nitrate solution, 99 g / L sodium citrate solution and 0.18 g / L surfactant solution are prepared respectively using ultrapure water, and then 0.1 L of the sodium citrate solution is slowly introduced into 0.1 L of the silver nitrate solution using a glass rod according to a volume ratio, mixed uniformly to obtain a mixed solution, and then 0.1 L of the surfactant solution is added into the mixed solution, mixed uniformly to obtain the antibacterial liquid.

[0064] Example 5

[0065] The same as example 4, except that the surfactant is a composition of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2:15:3.

[0066] Example 6

[0067] The same as example 4, except that the surfactant is a composition of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2:12:3.

[0068] Comparative Example 1

[0069] The same as Example 4, except that equal amounts of ultrapure water are used instead of the surfactant combination of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2:10:3.

[0070] Performance tests

[0071] The nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared in Examples 1-6 and Comparative Example 1 is subjected to the following performance tests, and the test results are shown in Table 1:

[0072] Antibacterial performance test: The antibacterial performance test is carried out in accordance with the standard of antibacterial textile detection method AATCC-100, and the test objects include ATCC25922 Escherichia coli (gram-negative bacteria) and ATCC6538 Staphylococcus aureus (gram-positive bacteria);

[0073] Contact angle test: The test is carried out by using a JY-PHB contact angle tester of Chengde Jinhe Instrument Manufacturing Co., Ltd.

[0074] Washing resistance test: The nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric to be tested is washed according to the 4A procedure in the standard GB / T8629-2001, and the antibacterial performance is measured after 50 times of washing;

[0075] Table 1

[0076]

[0077] As can be seen from Table 1, the Staphylococcus aureus antibacterial rate of the nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared in Examples 1-6 is 99.91-99.99%, and the Escherichia coli antibacterial rate is 99.91-99.99%, which has excellent antibacterial effect; the contact angle is 150-160°, which has good hydrophobic property, and the inhibition rate after 50 times of washing is greater than 90%, indicating that the antibacterial performance of the prepared nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric is stable and very durable, and the obtained nano-silver will not be washed off from the non-woven fabric.

[0078] As can be seen from Table 1, the performance of the nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared in Examples 1-3 and Examples 4-6 is compared and analyzed, and the nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared by using the surfactant combination of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2:10:3 has better inhibition rate after 50 times of washing by utilizing the synergistic effect between the surfactants.

[0079] As can be seen from Table 1, the performance of the nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared in Examples 1-6 and Comparative Example 1 is compared and analyzed, and the antibacterial performance stability and durability of the nano-silver based biomimetic super-hydrophobic antibacterial non-woven fabric prepared without adding surfactants are poor.

[0080] Skin irritation test

[0081] Skin irritation test was performed on the nano-silver based biomimic super-hydrophobic antibacterial nonwoven fabric prepared in Examples 1-6 and Comparative Example 1, according to the following method: The relevant provisions and contents in the Technical Guidelines for Irritation, Allergy and Hemolysis Research of Chemical Drugs issued by the State Food and Drug Administration were adopted. The nano-silver based biomimic super-hydrophobic antibacterial nonwoven fabric was attached to the back of a white rabbit on one side, and was removed after 3 days. According to the scoring standard: (1) 0-0.49 was non-irritating; (2) 0.5-2.99 was mild irritation; (3) 3.0-5.99 was moderate irritation; (4) 6.0-8.00 was strong irritation. The irritation of the nano-silver based biomimic super-hydrophobic antibacterial nonwoven fabric to the skin was evaluated by averaging the scores, and the test results are shown in Table 2:

[0082] Table 2

[0083] Score Results Example 1 0.25 Non-irritant Example 2 0.12 Non-irritant Example 3 0.29 Non-irritant Example 4 0.15 Non-irritant Example 5 0.18 Non-irritant Example 6 0.11 Non-irritant Comparative Example 1 0.32 Non-irritant

[0084] As can be seen from Table 2, the results of the skin irritation test of the nano-silver based biomimic super-hydrophobic antibacterial nonwoven fabric prepared in Examples 1-6 showed that the nano-silver based biomimic super-hydrophobic antibacterial nonwoven fabric would not cause toxic reactions and irritation when in long-term contact with the skin, and was safe and reliable for the human body.

[0085] The above examples are only used to explain the technical solutions of the present application and are not intended to limit the same. Although the above examples specifically illustrate the present application, it should be understood by those skilled in the art that the specific embodiments of the present application can still be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modification and equivalent replacement thereof should be covered within the protection scope of the present application.

Claims

1. A method for preparing a biomimetic superhydrophobic antibacterial nonwoven fabric based on nano-silver, characterized in that, The method comprises the following steps: S1, the non-woven fabric is sequentially cleaned by ultrasonic cleaning with anhydrous ethanol and deionized water, and then dried in an oven to obtain a pretreated non-woven fabric; S2, the antibacterial liquid is moved into a polyethylene bottle, the pretreated non-woven fabric is immersed in the antibacterial liquid, and then the polyethylene bottle containing the non-woven fabric and the antibacterial liquid is placed in a magnetic stirrer for stirring; S3, the stirred polyethylene bottle is placed in an oven for heating reaction, and after the reaction is completed, the non-woven fabric is taken out, washed repeatedly with deionized water, and then dried; S4, steps S2 and S3 are repeated for 1-5 times to obtain a biomimetic super-hydrophobic antibacterial non-woven fabric based on nano-silver; In step S2, the antibacterial liquid comprises the following raw materials with mass concentrations: silver nitrate 0.15-0.57 g / L, sodium citrate 30-35 g / L, and a surfactant 0.05-0.07 g / L; the surfactant is a combination of polyethylene glycol, polyvinylpyrrolidone and sodium alginate in a mass ratio of 2: (10-15) : 3; In step S2, the preparation method of the antibacterial liquid is as follows: first, prepare silver nitrate solution with a concentration of 0.45-1.7 g / L, sodium citrate solution with a concentration of 90-105 g / L, and surfactant solution with a concentration of 0.15-0.21 g / L using ultrapure water, and then slowly introduce 1 part of the sodium citrate solution into 1 part of the silver nitrate solution using a glass rod, mix well, add 1 part of the surfactant solution to the mixture, and mix well to obtain the antibacterial liquid.

2. The method of claim 1, wherein the method of preparing a biomimetic superhydrophobic antibacterial nonwoven fabric based on silver nanoparticles is characterized by, In step S1, the non-woven fabric is ultrasonically cleaned with anhydrous ethanol and deionized water for 30 min, and the ultrasonic frequency is 60-100 kHz.

3. The method as claimed in claim 1, wherein the method of preparation of a nano-silver based biomimetic superhydrophobic antibacterial nonwoven fabric is characterized by, In step S1, the drying process conditions are as follows: temperature 40-60°C, and time 1-3 h.

4. The method as claimed in claim 1, wherein the method of preparation of a nano-silver based biomimetic superhydrophobic antibacterial nonwoven fabric is characterized by, In step S2, the stirring process conditions are as follows: stirring speed 200 r / min, and time 10-50 min.

5. The method as claimed in claim 1, wherein the method of preparation of a nano-silver based biomimetic superhydrophobic antibacterial nonwoven fabric is characterized by, In step S3, the heating reaction process conditions are as follows: temperature 95°C, and time 1-2 h.

6. The method as claimed in claim 1, wherein the method of preparation of a nano-silver based biomimetic superhydrophobic antibacterial nonwoven fabric is characterized by, In step S3, the drying process conditions are as follows: temperature 60°C, and time 1-3 h.

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