Water-repellent antibacterial fiber and preparation method thereof

Abstract

The invention relates to the technical field of polypropylene fibers, in particular to a water-repellent antibacterial fiber and a preparation method thereof.Modified chitosan and nano-zinc oxide cooperate, a stable hydrophobic surface can be formed, fluoride pollution is avoided at the same time, and due to the dual mechanism between chitosan and nano-zinc oxide, the water-repellent antibacterial fiber has a good antibacterial effect. The antibacterial rate on escherichia coli and staphylococcus aureus is high, the risk of drug resistance is avoided, and the polypropylene grafted styrene and the aniline are doped and synergetic, so that the antistatic effect can be achieved; secondly, modified chitosan is subjected to dual treatment through a titanate coupling agent and sodium dodecyl sulfate, the compatibility and dispersity of the modified chitosan and polypropylene can be improved, agglomeration is avoided, the interface bonding force is enhanced through coating of a silane coupling agent in modified zinc oxide, degradation of a polypropylene matrix by ultraviolet light catalysis can be reduced, and the anti-ultraviolet performance of the polypropylene is improved. The antistatic modified component optimizes a conductive path through a step-by-step grafting and acid doping process, and the antistatic property and the mechanical strength can be both considered.

Description

Technical Field

[0001] The present invention relates to the technical field of polypropylene fibers, and in particular to a water-repellent and antibacterial fiber and a preparation method thereof. Background Art

[0002] As people's living standards improve, the demand for high-quality fabrics and clothing is growing. In addition to basic needs such as warmth, style and patterns, the demand for fabrics with different functions is also becoming more and more widespread. In daily life, people often wear clothing made of natural hydrophilic fiber fabrics such as cotton and linen. Although these clothes are comfortable, they are easily contaminated by liquids such as soup, seasonings, and blood in scenes such as dining, cooking, and injuries. Once these pollutants are contaminated with clothing and are not removed in time, they not only affect the appearance of the clothing, but also bacteria and viruses in the air will attach to organic stains and further breed, threatening human health. Therefore, in addition to having good water-repellent and anti-pollution properties, clothing fabrics must also have excellent antibacterial properties.

[0003] In the field of textiles, water-repellent and antibacterial finishing of fabrics has received widespread attention. Currently, there are many methods for achieving water-repellent and antibacterial functions of fabrics. For example, a method for preparing antibacterial cotton fabric based on in-situ reduction of nanosilver with thiolated chitosan is described. The method involves immersing thiolated chitosan-grafted cotton fabric in a silver nitrate solution, slowly adding a reducing agent at room temperature, and reacting to obtain an antibacterial cotton fabric. However, these methods have certain limitations in terms of process, and some processes are relatively cumbersome, such as the method of combining chitosan with silver, which affects their large-scale promotion and application. Therefore, how to improve the preparation process to produce fibers with excellent waterproof and antibacterial properties has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0004] Technical problems solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a water-repellent and antibacterial fiber and a preparation method thereof, which can effectively solve the problem of poor waterproof and antibacterial properties of polypropylene fibers in the prior art.

[0006] Technical Solution

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

[0008] A water-repellent antibacterial fiber, comprising the following components: modified chitosan, modified zinc oxide, an antistatic modified component, an antioxidant 1010, and polypropylene;

[0009] The modified chitosan is prepared by grinding chitosan and then performing surface modification treatment with a coupling agent;

[0010] The modified zinc oxide is prepared by modifying nano zinc oxide with a silane coupling agent;

[0011] The antistatic modification component is prepared by modifying polypropylene grafted styrene.

[0012] Furthermore, the preparation steps of the modified chitosan are as follows:

[0013] Step 1: Pour chitosan into a ball milling tank for intermittent grinding, and the obtained product after grinding is denoted as chitosan powder;

[0014] Step 2: Weigh 0.1 - 0.2 g of titanate coupling agent and disperse it in 100 mL of ethanol aqueous solution. Stir and dissolve it under the water bath condition of 60 °C, add 0.1 - 0.2 g of sodium dodecyl sulfonate and continue stirring. The obtained product is the coupling agent solution;

[0015] Step 3: Weigh 9 - 10 g of chitosan powder and pour it into the coupling agent solution. After stirring and reacting, filter to remove the filtrate, wash it 3 times with absolute ethanol and then 2 times with deionized water. After drying treatment, grind it through a 200 - mesh sieve. The obtained product is the modified chitosan.

[0016] Furthermore, the grinding speed in Step 1 is 300 r / min, the grinding time is 4 - 6 h, and the grinding method is to stop for 15 min every 30 min of grinding. The volume fraction of the ethanol aqueous solution in Step 2 is 90%, the method of stirring and dissolving in Step 2 is to stir at a stirring speed of 500 r / min for 30 min, and the method of continuing to stir in Step 2 is to stir at a stirring speed of 300 r / min for 10 min.

[0017] Furthermore, the method of stirring and reacting in Step 3 is to stir and react at a stirring speed of 200 r / min for 2 h, and the method of drying treatment in Step 3 is to first place it in a vacuum drying oven at 60 °C for drying for 12 h and then place it in a vacuum drying oven at 80 °C for drying for 2 h.

[0018] Furthermore, the preparation steps of the modified zinc oxide are as follows:

[0019] Step A: Weigh 3 - 4 g of silane coupling agent KH - 550 and disperse it in 100 mL of ethanol aqueous solution. After stirring and dissolving, add 50 - 60 g of nano zinc oxide for dispersion treatment in a dispersant. The obtained product is denoted as the mixture;

[0020] Step B: Add 200 mL of absolute ethanol to the mixture, then pour it into a high - speed centrifuge and centrifuge at a speed of 5000 r / min for 10 min. After drying treatment, grind it through a 200 - mesh sieve. The obtained product is the modified zinc oxide.

[0021] Further, the mass fraction of the ethanol aqueous solution in step A is 80%, the method of dispersion treatment in step A is to mix at a stirring speed of 800 r / min for 10 min, and the method of drying treatment in step B is to dry in a vacuum drying oven at 68 °C for 8 h.

[0022] Further, the preparation method of the antistatic modification component is as follows:

[0023] S1. Under a nitrogen atmosphere, pour polypropylene, styrene, and diisopropylbenzene peroxide into a reaction flask according to a weight ratio of 20:40:1, react at a temperature of 140 °C for 6 h, then cool to room temperature, filter by suction, extract with ethyl acetate for 24 h, filter by suction again, and then perform drying treatment. The obtained product is denoted as the grafted component;

[0024] S2. Weigh 2 g of the grafted component, add it to 30 mL of chloroform and swell for 12 h, then add 30 mL of sulfuric acid solution and react at a temperature of 40 °C for 9 h. Pour the obtained product into 100 mL of deionized water, stir and mix, then filter by suction. Dry and grind the suction-filtered product, and it is denoted as the intermediate component;

[0025] S3. Weigh 5 g of the intermediate component, add it to 150 mL of deionized water, ultrasonically disperse it, then add 3 - 4 g of aniline and react for 8 h. Add 10 mL of hydrochloric acid solution, stir and react for 1 h, then dropwise add 0.1 g of the initiator component, ultrasonically react at a temperature of 30 °C, then filter by suction, and after drying treatment, the obtained product is the antistatic modification component.

[0026] Further, the drying treatment method in S1 is to dry in an oven at 65 °C for 3 - 5 h, the stirring and mixing method in S2 is to stir at a stirring speed of 300 r / min for 10 min, the drying and grinding method in S2 is to dry in an oven at 60 °C for 5 h and then grind through a 200-mesh sieve, and the mass fraction of the sulfuric acid solution in S2 is 70%.

[0027] Further, the ultrasonic dispersion method in S3 is to ultrasonically disperse at a frequency of 30 kHz for 30 min, the mass fraction of the hydrochloric acid solution in S3 is 20%, the stirring speed of the stirring reaction in S3 is 300 r / min, the ultrasonic reaction method in S3 is to ultrasonically disperse at a frequency of 22 kHz for 30 min, the drying treatment method in S3 is to dry in an oven at 68 °C for 4 - 5 h, and the initiator component in S3 is prepared by mixing ammonium persulfate and potassium persulfate according to an equal weight ratio.

[0028] A preparation method of a water-repellent and antibacterial fiber, the preparation method is as follows:

[0029] Weigh 100 parts by weight of polypropylene, 2 - 3 parts by weight of modified chitosan, 1 - 2 parts by weight of modified zinc oxide, 3 - 5 parts by weight of antistatic modification component and 1 - 2 parts by weight of antioxidant 1010, pour them into an internal mixer, and carry out internal mixing at a temperature of 200 °C and a rotational speed of 50 r / min for 5 min. Then, prepare fibers through melt electrospinning, and the obtained fibers are water - repellent and antibacterial fibers.

[0030] Beneficial effects

[0031] The present invention provides a water - repellent and antibacterial fiber and a preparation method thereof. Compared with the existing well - known technologies, the present invention has the following beneficial effects:

[0032] In the present invention, the synergistic effect of modified chitosan and nano - zinc oxide can form a stable hydrophobic surface, while avoiding fluoride pollution. Moreover, the dual mechanism between chitosan and nano - zinc oxide has a high antibacterial rate against Escherichia coli and Staphylococcus aureus and no risk of drug resistance. The grafting of styrene onto polypropylene and the doping of aniline in the present invention can also achieve an antistatic effect; secondly, modified chitosan is treated by a titanate coupling agent and sodium dodecyl sulfonate, which can improve its compatibility and dispersibility with polypropylene and avoid agglomeration. The interfacial bonding force of modified zinc oxide is enhanced by the coating of a silane coupling agent, which can reduce the degradation of the polypropylene matrix by ultraviolet photocatalysis. The antistatic modification component optimizes the conductive path through a step - by - step grafting and acid doping process, which can balance antistatic performance and mechanical strength. Finally, the internal mixing process in the present invention matches with melt electrospinning, which can realize continuous production, thereby reducing energy consumption and making the prepared water - repellent and antibacterial fibers have better application prospects. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] The sources of some components in the examples and comparative examples are as follows:

[0036] Chitosan, industrial grade; particle size ≥ 40 mesh, Jinan Haidebei Marine Bio - engineering Co., Ltd.;

[0037] Titanate coupling agent, analytical pure, Nanjing Daoning Chemical Co., Ltd.;

[0038] Ethanol, analytical pure, Hangzhou Gaojing Fine Chemical Co., Ltd.;

[0039] Sodium dodecyl sulfonate, analytical reagent, Tianjin Kemiou Chemical Reagent Co., Ltd.;

[0040] Silane coupling agent KH-550, Aladdin Reagent Co., Ltd.;

[0041] Nano zinc oxide, (30±10)nm, Aladdin Reagent Co., Ltd.;

[0042] Polypropylene, Daqing Petrochemical Co., Ltd.;

[0043] Styrene, Tianjin Institute of Chemical Reagents;

[0044] Dicumyl peroxide, National Institute of Chemical Reagents Co., Ltd.;

[0045] Ethyl acetate, Tianjin Kaitong Chemical Reagent Co., Ltd.;

[0046] Aniline, Tianjin Kemiou Chemical Reagent Co., Ltd.;

[0047] Ammonium persulfate, Aladdin Reagent (Shanghai) Co., Ltd.;

[0048] Potassium persulfate, Aladdin Reagent (Shanghai) Co., Ltd.;

[0049] Antioxidant 1010, industrial grade, BASF (China) Co., Ltd.

[0050] Example 1

[0051] A water-repellent and antibacterial fiber in this example, the water-repellent and antibacterial fiber is composed of the following components: modified chitosan, modified zinc oxide, antistatic modification component, antioxidant 1010 and polypropylene;

[0052] The modified chitosan is obtained by grinding chitosan and then performing surface modification treatment with a coupling agent, and its preparation steps are:

[0053] Step 1: Pour chitosan into the ball mill tank for intermittent grinding. The grinding method is to stop for 15 minutes every 30 minutes of grinding. After grinding at a speed of 300 r / min for 4 hours, the obtained product is recorded as chitosan powder;

[0054] Step 2: Weigh 0.1 g of titanate coupling agent and disperse it in 100 mL of an ethanol aqueous solution with a volume fraction of 90%. Stir at a stirring speed of 500 r / min under the water bath condition of 60 °C for 30 minutes. After adding 0.1 g of sodium dodecyl sulfonate, stir at a stirring speed of 300 r / min for 10 minutes. The obtained product is the coupling agent solution;

[0055] Step 3: Weigh 9 g of chitosan powder and pour it into the coupling agent solution. Stir and react at a stirring speed of 200 r / min for 2 h, then filter to remove the filtrate. Wash it 3 times with absolute ethanol and then 2 times with deionized water. First, dry it in a vacuum drying oven at 60 °C for 12 h, and then dry it in a vacuum drying oven at 80 °C for 2 h. After grinding through a 200-mesh sieve, the obtained product is the modified chitosan.

[0056] The modified zinc oxide is prepared by modifying nano zinc oxide with a silane coupling agent. The preparation steps are as follows:

[0057] Step A: Weigh 3 g of silane coupling agent KH-550 and disperse it in 100 mL of an ethanol aqueous solution with a mass fraction of 80%. Stir at a stirring speed of 400 r / min for 10 min, then add 50 g of nano zinc oxide and mix at a stirring speed of 800 r / min in the dispersant for 10 min. The obtained product is denoted as the mixture.

[0058] Step B: Add 200 mL of absolute ethanol to the mixture, then pour it into a high-speed centrifuge and centrifuge at a speed of 5000 r / min for 10 min. Dry it in a vacuum drying oven at 68 °C for 8 h, then grind it through a 200-mesh sieve. The obtained product is the modified zinc oxide.

[0059] The antistatic modification component is prepared by modifying polypropylene grafted styrene. The preparation method is as follows:

[0060] S1: Under a nitrogen atmosphere, pour polypropylene, styrene, and diisopropylbenzene peroxide into the reaction flask according to a weight ratio of 20:40:1. React at a temperature of 140 °C for 6 h, then cool to room temperature. Filter, extract with ethyl acetate for 24 h, filter again, and dry in an oven at 65 °C for 3 h. The obtained product is denoted as the grafted component.

[0061] S2: Weigh 2 g of the grafted component, add it to 30 mL of chloroform and swell for 12 h. Then add 30 mL of a sulfuric acid solution with a mass fraction of 70% and react at a temperature of 40 °C for 9 h. Pour the obtained product into 100 mL of deionized water, stir at a stirring speed of 300 r / min for 10 min, then filter. Place the filtered product in an oven at 60 °C and dry for 5 h, then grind it through a 200-mesh sieve and denote it as the intermediate component.

[0062] S3. Weigh 5 g of the intermediate component, add it to 150 mL of deionized water, ultrasonically disperse it at a frequency of 30 kHz for 30 min, then add 3 g of aniline and react for 8 h. Add 10 mL of a hydrochloric acid solution with a mass fraction of 20%, stir and react at a stirring speed of 300 r / min for 1 h, then dropwise add 0.1 g of the initiator component. Ultrasonically disperse it at a frequency of 22 kHz for 30 min at a temperature of 30 °C, then perform suction filtration, and dry it in an oven at 68 °C for 4 h. What is obtained is the antistatic modified component. Among them, the initiator component is prepared by mixing ammonium persulfate and potassium persulfate in an equal weight ratio.

[0063] A preparation method of a water-repellent and antibacterial fiber, and the preparation method is as follows:

[0064] Weigh 100 parts by weight of polypropylene, 2 parts by weight of modified chitosan, 1 part by weight of modified zinc oxide, 3 parts by weight of the antistatic modified component, and 1 part by weight of antioxidant 1010, pour them into an internal mixer, and knead at a temperature of 200 °C and a rotation speed of 50 r / min for 5 min, and prepare fibers by melt electrospinning. What is obtained is the water-repellent and antibacterial fiber.

[0065] Example 2

[0066] A water-repellent and antibacterial fiber in this example, and the water-repellent and antibacterial fiber is composed of the following components: modified chitosan, modified zinc oxide, antistatic modified component, antioxidant 1010, and polypropylene;

[0067] The modified chitosan is obtained by grinding chitosan and then performing surface modification treatment with a coupling agent. Its preparation steps are as follows:

[0068] Step 1. Pour chitosan into a ball mill tank for intermittent grinding. The grinding method is to stop for 15 min every 30 min of grinding. Grind at a rotation speed of 300 r / min for 6 h, and what is obtained is recorded as chitosan powder;

[0069] Step 2. Weigh 0.2 g of titanate coupling agent, disperse it in 100 mL of an ethanol aqueous solution with a volume fraction of 90%, stir at a stirring speed of 500 r / min under a water bath condition of 60 °C for 30 min, add 0.2 g of sodium dodecyl sulfate, and then stir at a stirring speed of 300 r / min for 10 min. What is obtained is the coupling agent solution;

[0070] Step 3. Weigh 10 g of chitosan powder, pour it into the coupling agent solution, stir and react at a stirring speed of 200 r / min for 2 h, then perform suction filtration to remove the filtrate, wash it 3 times with absolute ethanol and then 2 times with deionized water, first dry it in a vacuum drying oven at 60 °C for 12 h, then dry it in a vacuum drying oven at 80 °C for 2 h, grind it through a 200-mesh sieve, and what is obtained is the modified chitosan.

[0071] The modified zinc oxide is prepared by modifying nano zinc oxide with a silane coupling agent. The preparation steps are as follows:

[0072] Step A: Weigh 4 g of silane coupling agent KH-550 and disperse it in 100 mL of ethanol aqueous solution with a mass fraction of 80%. After stirring at a speed of 400 r / min for 10 min, add 60 g of nano zinc oxide and mix at a stirring speed of 800 r / min in the dispersant for 10 min. The obtained product is denoted as the mixture.

[0073] Step B: Add 200 mL of anhydrous ethanol to the mixture, then pour it into a high-speed centrifuge and centrifuge at a speed of 5000 r / min for 10 min. Place it in a vacuum drying oven at 68 °C and dry for 8 h, then grind it through a 200-mesh sieve. The obtained product is the modified zinc oxide.

[0074] The antistatic modification component is prepared by modifying polypropylene grafted styrene. Its preparation method is as follows:

[0075] S1: Under a nitrogen atmosphere, pour polypropylene, styrene, and diisopropylbenzene peroxide into the reaction flask according to a weight ratio of 20:40:1. React at a temperature of 140 °C for 6 h, then cool to room temperature. After suction filtration, extract with ethyl acetate for 24 h, and then perform suction filtration again and place it in an oven at 65 °C and dry for 5 h. The obtained product is denoted as the grafted component.

[0076] S2: Weigh 2 g of the grafted component, add it to 30 mL of chloroform and swell for 12 h. Then add 30 mL of sulfuric acid solution with a mass fraction of 70% and react at a temperature of 40 °C for 9 h. Pour the obtained product into 100 mL of deionized water, stir at a speed of 300 r / min for 10 min, and then perform suction filtration. Place the suction filtration product in an oven at 60 °C and dry for 5 h, and then grind it through a 200-mesh sieve and denote it as the intermediate component.

[0077] S3: Weigh 5 g of the intermediate component, add it to 150 mL of deionized water, ultrasonically disperse it at a frequency of 30 kHz for 30 min, then add 4 g of aniline and react for 8 h. Add 10 mL of hydrochloric acid solution with a mass fraction of 20%, stir and react at a speed of 300 r / min for 1 h, then dropwise add 0.1 g of the initiator component. Ultrasonically disperse it at a frequency of 22 kHz for 30 min at a temperature of 30 °C, and then perform suction filtration. Place it in an oven at 68 °C and dry for 5 h. The obtained product is the antistatic modification component, where the initiator component is prepared by mixing ammonium persulfate and potassium persulfate according to an equal weight ratio.

[0078] A preparation method of a water-repellent and antibacterial fiber. The preparation method is as follows:

[0079] Weigh 100 parts by weight of polypropylene, 3 parts by weight of modified chitosan, 2 parts by weight of modified zinc oxide, 5 parts by weight of antistatic modification component, and 2 parts by weight of antioxidant 1010, and pour them into an internal mixer. Knead at a temperature of 200 °C and a rotation speed of 50 r / min for 5 min, and prepare fibers by melt electrospinning. The obtained fibers are water-repellent and antibacterial fibers.

[0080] Example 3

[0081] A kind of water-repellent and antibacterial fiber in this example, the water-repellent and antibacterial fiber is composed of the following components: modified chitosan, modified zinc oxide, antistatic modification component, antioxidant 1010, and polypropylene;

[0082] The modified chitosan is prepared by grinding chitosan and then performing surface modification treatment with a coupling agent. The preparation steps are as follows:

[0083] Step 1: Pour chitosan into a ball mill tank for intermittent grinding. The grinding method is to stop for 15 min every 30 min of grinding. After grinding at a rotation speed of 300 r / min for 5 h, the obtained product is recorded as chitosan powder;

[0084] Step 2: Weigh 0.2 g of titanate coupling agent and disperse it in 100 mL of an ethanol aqueous solution with a volume fraction of 90%. Stir at a stirring speed of 500 r / min under a water bath condition of 60 °C for 30 min. After adding 0.1 g of sodium dodecyl sulfate, stir at a stirring speed of 300 r / min for 10 min. The obtained product is the coupling agent solution;

[0085] Step 3: Weigh 10 g of chitosan powder and pour it into the coupling agent solution. Stir and react at a stirring speed of 200 r / min for 2 h, then filter to remove the filtrate. Wash it 3 times with absolute ethanol and then 2 times with deionized water. First, dry it in a vacuum drying oven at 60 °C for 12 h, and then dry it in a vacuum drying oven at 80 °C for 2 h. After grinding through a 200-mesh sieve, the obtained product is the modified chitosan.

[0086] The modified zinc oxide is prepared by modifying nano-zinc oxide with a silane coupling agent. The preparation steps are as follows:

[0087] Step A: Weigh 4 g of silane coupling agent KH-550 and disperse it in 100 mL of an ethanol aqueous solution with a mass fraction of 80%. Stir at a stirring speed of 400 r / min for 10 min, then add 55 g of nano-zinc oxide and mix at a stirring speed of 800 r / min in a dispersant for 10 min. The obtained product is recorded as the mixture;

[0088] Step B: Add 200 mL of absolute ethanol to the mixture, then pour it into a high-speed centrifuge and centrifuge at a rotation speed of 5000 r / min for 10 min. Place it in a vacuum drying oven at 68 °C and dry for 8 h, then grind through a 200-mesh sieve. The obtained product is the modified zinc oxide.

[0089] The antistatic modification component is prepared by modifying polypropylene grafted styrene, and its preparation method is as follows:

[0090] S1. Under a nitrogen atmosphere, pour polypropylene, styrene, and diisopropylbenzene peroxide into a reaction flask according to a weight ratio of 20:40:1, react at a temperature of 140 °C for 6 h, then cool to room temperature, filter by suction, extract with ethyl acetate for 24 h, filter by suction again, and dry in an oven at 65 °C for 4 h. The obtained product is denoted as the grafted component;

[0091] S2. Weigh 2 g of the grafted component, add it to 30 mL of chloroform and swell for 12 h, then add 30 mL of a sulfuric acid solution with a mass fraction of 70%, react at a temperature of 40 °C for 9 h, pour the obtained product into 100 mL of deionized water, stir at a stirring speed of 300 r / min for 10 min, then filter by suction, place the suction-filtered product in an oven at 60 °C and dry for 5 h, and then grind it through a 200-mesh sieve. The obtained product is denoted as the intermediate component;

[0092] S3. Weigh 5 g of the intermediate component, add it to 150 mL of deionized water, ultrasonically disperse it at a frequency of 30 kHz for 30 min, then add 4 g of aniline and react for 8 h, add 10 mL of a hydrochloric acid solution with a mass fraction of 20%, stir and react at a stirring speed of 300 r / min for 1 h, then dropwise add 0.1 g of the initiator component, ultrasonically disperse it at a frequency of 22 kHz for 30 min at a temperature of 30 °C, then filter by suction, place it in an oven at 68 °C and dry for 5 h. The obtained product is the antistatic modification component. Among them, the initiator component is prepared by mixing ammonium persulfate and potassium persulfate according to an equal weight ratio.

[0093] A preparation method of a water-repellent and antibacterial fiber, and the preparation method is as follows:

[0094] Weigh 100 parts by weight of polypropylene, 2 parts by weight of modified chitosan, 2 parts by weight of modified zinc oxide, 4 parts by weight of the antistatic modification component, and 2 parts by weight of antioxidant 1010, pour them into a mixer, knead at a temperature of 200 °C and a rotation speed of 50 r / min for 5 min, and prepare fibers by melt electrospinning. The obtained product is the water-repellent and antibacterial fiber.

[0095] Comparative Example 1

[0096] A water-repellent and antibacterial fiber and its preparation method provided in this comparative example are generally the same as those in Example 1. The main difference is that in this Comparative Example 1, the modified chitosan in Example 1 is replaced with unmodified chitosan.

[0097] Comparative Example 2

[0098] A water-repellent and antibacterial fiber and its preparation method provided in this comparative example are generally the same as those in Example 1. The main difference is that in this Comparative Example 1, the modified zinc oxide in Example 1 is replaced with unmodified zinc oxide.

[0099] Comparative Example 3

[0100] A water-repellent and antibacterial fiber provided in this comparative example and its preparation method are generally the same as those in Example 1, and the main difference is that in this Comparative Example 1, the antistatic modification component in Example 1 is replaced with polypropylene.

[0101] Performance Test

[0102] The water-repellent and antibacterial fibers prepared in Examples 1-3 and Comparative Examples 1-3 were respectively labeled as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3, and then the performances of Examples 1-3 and Comparative Examples 1-3 were detected. The specific detection methods and detection items are as follows:

[0103] 1. Referring to the standard of QB / T2591-2003, the colony counting method was used to determine the antibacterial activity against Staphylococcus aureus and Escherichia coli, so as to detect the bacteriostatic rates of Examples 1-3 and Comparative Examples 1-3. The obtained data are recorded in the following table;

[0104] 2. An automatic optical contact angle measuring instrument was used to measure the contact angle between the surfaces of Examples 1-3 and Comparative Examples 1-3 and water. The obtained data are recorded in the following table;

[0105] 3. Referring to the standard of GB / T14344-2022, the tensile fracture strength of Examples 1-3 and Comparative Examples 1-3 was detected. The obtained data are recorded in the following table;

[0106]

[0107] It can be seen from the data in the above table that the bacteriostatic rates, water contact angles, and tensile fracture strengths of the water-repellent and antibacterial fibers in Examples 1-3 of this invention are all higher than those in Comparative Examples 1-3, indicating that the water-repellent and antibacterial fibers prepared in the present invention have more excellent antibacterial performance, waterproof performance, and mechanical properties. Thus, it shows that adding modified chitosan, modified zinc oxide, and antistatic modification components in the preparation of water-repellent and antibacterial fibers can play a role in improving the fiber properties.

[0108] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-repellent and antibacterial fiber, characterized in that, The water-repellent and antibacterial fiber is composed of the following components: modified chitosan, modified zinc oxide, antistatic modification component, antioxidant 1010, and polypropylene; The modified chitosan is obtained by grinding chitosan and then performing surface modification treatment with a coupling agent; The modified zinc oxide is obtained by modifying nano zinc oxide with a silane coupling agent; The antistatic modification component is obtained by modifying polypropylene grafted styrene; 2. The water-repellent and antibacterial fiber according to claim 1, wherein, The preparation steps of the modified chitosan are as follows: Step 1: Pour chitosan into a ball milling tank for intermittent grinding, and the obtained product after grinding is denoted as chitosan powder; Step 2: Weigh 0.1 - 0.2 g of titanate coupling agent and disperse it in 100 mL of ethanol aqueous solution. Stir and dissolve it under the water bath condition of 60 °C. After adding 0.1 - 0.2 g of sodium dodecyl sulfonate, continue to stir. The obtained product is the coupling agent solution; Step 3: Weigh 9 - 10 g of chitosan powder and pour it into the coupling agent solution. After stirring and reacting, filter to remove the filtrate. Wash it 3 times with absolute ethanol and then 2 times with deionized water. After drying treatment, grind it through a 200-mesh sieve. The obtained product is the modified chitosan.

3. The water-repellent and antibacterial fiber according to claim 2, characterized in that, The grinding speed in Step 1 is 300 r / min, the grinding time is 4 - 6 h, and the grinding method is to stop for 15 min every 30 min of grinding. The volume fraction of the ethanol aqueous solution in Step 2 is 90%. The method of stirring and dissolving in Step 2 is to stir at a stirring speed of 500 r / min for 30 min. The method of continuing to stir in Step 2 is to stir at a stirring speed of 300 r / min for 10 min; 4. The water-repellent and antibacterial fiber according to claim 2, wherein The method of stirring and reacting in Step 3 is to stir and react at a stirring speed of 200 r / min for 2 h. The method of drying treatment in Step 3 is to first dry it in a vacuum drying oven at 60 °C for 12 h and then dry it in a vacuum drying oven at 80 °C for 2 h; 5. A water-repellent and antibacterial fiber according to claim 1, characterized in that, The preparation steps of the modified zinc oxide are as follows: Step A: Weigh 3 - 4 g of silane coupling agent KH-550 and disperse it in 100 mL of ethanol aqueous solution. After stirring and dissolving, add 50 - 60 g of nano zinc oxide for dispersion treatment in a dispersant. The obtained product is denoted as the mixture; Step B: Add 200 mL of absolute ethanol to the mixture and then pour it into a high-speed centrifuge to centrifuge at a speed of 5000 r / min for 10 min. After drying treatment, grind it through a 200-mesh sieve. The obtained product is the modified zinc oxide; 6. The water-repellent and antibacterial fiber according to claim 5, characterized in that, The mass fraction of the ethanol aqueous solution in Step A is 80%. The method of dispersion treatment in Step A is to mix at a stirring speed of 800 r / min for 10 min. The method of drying treatment in Step B is to dry it in a vacuum drying oven at 68 °C for 8 h; 7. The water-repellent and antibacterial fiber according to claim 1, characterized in that, The preparation method of the antistatic modification component is as follows: S1: Under a nitrogen atmosphere, pour polypropylene, styrene, and diisopropylbenzene peroxide into a reaction flask according to a weight ratio of 20:40:

1. React at a temperature of 140 °C for 6 h and then cool to room temperature. After filtration, extract it with ethyl acetate for 24 h. After filtration again, perform drying treatment. The obtained product is denoted as the grafted component; S2. Weigh 2 g of the grafted component, add it to 30 mL of chloroform and swell for 12 h. Then add 30 mL of sulfuric acid solution and react at 40 °C for 9 h. Pour the obtained product into 100 mL of deionized water, stir and mix, and then perform suction filtration. After drying and grinding the suction filtration product, it is recorded as the intermediate component. S3. Weigh 5 g of the intermediate component, add it to 150 mL of deionized water, ultrasonically disperse it, then add 3 - 4 g of aniline and react for 8 h. Add 10 mL of hydrochloric acid solution, stir and react for 1 h, then dropwise add 0.1 g of the initiator component. After ultrasonic reaction at 30 °C, perform suction filtration. After drying treatment, the obtained product is the antistatic modified component.

8. The water-repellent and antibacterial fiber according to claim 7, wherein The drying treatment method in S1 is to dry in an oven at 65 °C for 3 - 5 h. The stirring and mixing method in S2 is to stir at a stirring speed of 300 r / min for 10 min. The drying and grinding method in S2 is to dry in an oven at 60 °C for 5 h and then grind through a 200 - mesh sieve. The mass fraction of the sulfuric acid solution in S2 is 70%.

9. The water-repellent and antibacterial fiber according to claim 7, characterized in that, The ultrasonic dispersion method in S3 is to ultrasonically disperse at a frequency of 30 kHz for 30 min. The mass fraction of the hydrochloric acid solution in S3 is 20%. The stirring speed of the stirring reaction in S3 is 300 r / min. The ultrasonic reaction method in S3 is to ultrasonically disperse at a frequency of 22 kHz for 30 min. The drying treatment method in S3 is to dry in an oven at 68 °C for 4 - 5 h. The initiator component in S3 is prepared by mixing ammonium persulfate and potassium persulfate in an equal weight ratio.

10. A method for preparing a water-repellent and antibacterial fiber according to any one of claims 1-9, characterized in that, The preparation method is as follows: Weigh 100 parts by weight of polypropylene, 2 - 3 parts by weight of modified chitosan, 1 - 2 parts by weight of modified zinc oxide, 3 - 5 parts by weight of the antistatic modified component, and 1 - 2 parts by weight of antioxidant 1010, pour them into an internal mixer, and knead at a temperature of 200 °C and a rotation speed of 50 r / min for 5 min. Then prepare fibers by melt electrospinning. The obtained product is the water - repellent and antibacterial fiber.

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