Antibacterial polyurethane fiber for socks and preparation method thereof
By combining antibacterial microcapsules with synergists, the problem of bacterial and fungal growth in polyurethane fibers in humid environments has been solved, achieving efficient and long-lasting antibacterial effects and improving fiber performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAOYUAN HAIBAINA SOCKS CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-05-12
AI Technical Summary
Existing polyurethane fibers are prone to bacterial and fungal growth in humid environments, leading to fiber degradation, discoloration, and odor. Furthermore, traditional antibacterial treatment methods have poor antibacterial durability and are easily washed away.
Antibacterial polyurethane fibers were prepared by using antibacterial microcapsule technology and combining berberine-ellagic acid hybrid nanocrystals with zirconium-polyphenol complex synergists. The antibacterial components were released slowly and controlled by the microcapsules, and the fibers were prepared by wet spinning technology.
It achieves highly efficient and long-lasting antibacterial properties, improves the inhibition efficiency against a variety of bacteria and fungi, maintains the mechanical properties and washability of fibers, and avoids the side effects of traditional antibacterial agents.
Smart Images
Figure CN122013357A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of composite materials technology, specifically to an antibacterial polyurethane fiber for socks and its preparation method. Background Technology
[0002] Polyurethane fiber has become one of the important functional materials in sock manufacturing due to its excellent elasticity, abrasion resistance and comfort.
[0003] In the prior art, ordinary polyurethane fibers without antibacterial treatment are prone to the growth of bacteria, fungi and other microorganisms in humid and warm environments, leading to problems such as fiber degradation, discoloration and odor. Currently, common antibacterial treatment methods on the market include surface coating, blending with inorganic or organic antibacterial agents. These methods have problems such as poor antibacterial durability and easy washing off. Based on this, the present invention provides an antibacterial polyurethane fiber for socks and its preparation method. Summary of the Invention
[0004] The purpose of this invention is to provide an antibacterial polyurethane fiber for socks and its preparation method. This invention has efficient, long-lasting and stable antibacterial properties, which can effectively inhibit the growth of common bacteria and fungi in socks, and solve problems such as odor, material degradation and potential health risks caused by microbial reproduction.
[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides an antibacterial polyurethane fiber for socks, characterized in that it comprises the following raw materials in parts by weight: 100 parts polyurethane resin, 350-450 parts organic solvent, 15-30 parts antibacterial microcapsules, 3-8 parts emulsifier, 1-5 parts viscosity modifier, and 2-6 parts antibacterial synergist. The antibacterial microcapsules are prepared by the following method: S1: Berberine and ellagic acid are dissolved together in a 50% ethanol solution at a mass ratio of 1:(0.5-2), and the mixture is stirred at 50-65℃ for 2-4 hours to obtain the core material. The mass of berberine is 20% of the mass of the ethanol solution. S2: Chitosan and gum arabic are dissolved in a 1% acetic acid solution at a mass ratio of 1:(1-2) to prepare a wall material; S3: Disperse the core material obtained in S1 into the wall material, adjust the pH to 4.5-5.5 with dilute alkali solution, stir and react for 1-2 hours to obtain an emulsion; S4: After cooling the emulsion to room temperature, centrifuge to obtain a precipitate. Wash the precipitate three times alternately with deionized water and anhydrous ethanol at 4°C. Place the product in a freeze-drying pan and pre-freeze at -45°C for 5 hours. Then transfer it to a freeze dryer and freeze-dry at -55°C and a vacuum of 15 Pa for 36 hours to obtain antibacterial microcapsules.
[0006] Furthermore, the antibacterial synergist is prepared by the following method: Step 1: Poplar polyphenol extract is dissolved in deionized water and stirred at 55-65℃ for 30 minutes to obtain the first mixture, wherein the mass of poplar polyphenol extract is 5% of the mass of deionized water; Step 2: Add zirconium oxychloride powder to the first mixture and mix well, wherein the mass of zirconium oxychloride is 25%-40% of the mass of poplar polyphenol extract; Step 3: After mixing the first mixture with zirconium oxychloride powder, maintain the temperature at 50°C and continue the reaction for 2.5-3.5 hours. After the reaction is completed, allow it to cool to room temperature. The resulting product is then centrifuged, washed with ethanol, dried, and ground to obtain the antibacterial synergist.
[0007] Further, the poplar polyphenol extract is prepared by the following method: poplar bark powder is mixed with a 60% ethanol aqueous solution at a solid-liquid ratio of 1:(9-11) to obtain a second mixture. The second mixture is refluxed twice at 80-90℃, each time for 1.5-2.5h. The extracts are combined and filtered to obtain a filtrate. The filtrate is concentrated under reduced pressure to remove ethanol. The obtained product is freeze-dried to obtain the poplar polyphenol extract.
[0008] Furthermore, the dilute alkaline solution is selected as a sodium bicarbonate solution with a concentration of 1-5%.
[0009] Furthermore, the organic solvent is N,N-dimethylformamide.
[0010] Furthermore, the emulsifier is selected from gum arabic.
[0011] Furthermore, the viscosity modifier is selected from fumed silica.
[0012] Secondly, the present invention also provides a method for preparing antibacterial polyurethane fibers for socks, comprising the following steps: Step 1: Dissolve polyurethane resin in an organic solvent to obtain a stock solution. Add antibacterial microcapsules, emulsifier, viscosity modifier and antibacterial synergist to the stock solution, stir and mix evenly to obtain a mixture. Step 2: After degassing and filtration, the mixture is injected into a coagulation bath using wet spinning technology to form nascent fibers. Step 3: Wash the nascent fibers with hot water at 50-70℃. After washing, heat stretch them in a hot medium at 70-95℃, then oil them. The resulting product is dried and heat-set at 100-130℃. The resulting product is then wound to obtain antibacterial polyurethane fiber for socks.
[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by adding antibacterial microcapsules, the antibacterial microcapsules can release antibacterial components in the fiber system. By utilizing the antibacterial components, the durability of the antibacterial effect can be significantly extended, effectively overcoming the defects of easy migration and easy elution of antibacterial components in traditional polyurethane fibers.
[0014] 2. This invention utilizes the combined use of berberine-ellagic acid hybrid nanocrystals and zirconium-polyphenol complex synergists to leverage the synergistic effect between antibacterial components, significantly improving the inhibition efficiency and broad-spectrum activity against a variety of common bacteria and fungi.
[0015] 3. The antibacterial active ingredients selected in this invention, such as berberine, ellagic acid, and plant polyphenols, are derived from natural extracts, are non-irritating to human skin, are environmentally friendly, and avoid the side effects of traditional metal antibacterial agents or organic synthetic bactericides.
[0016] 4. The antibacterial microcapsules used in this invention are prepared by compound coagulation method. They have a stable structure and their addition and spinning process are compatible with polyurethane fibers. They are not easily damaged during processing, resulting in polyurethane fiber materials with excellent mechanical properties, good washability and wear resistance, and effectively improving their service life. Attached Figure Description
[0017] Figure 1 A flowchart is provided for the invention of an antibacterial polyurethane fiber for socks. Detailed Implementation
[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application are described clearly and completely below.
[0020] Example 1
[0021] Preparation of antibacterial microcapsules: S1: Berberine and ellagic acid are dissolved together in a 50% ethanol solution at a mass ratio of 1:0.5, and the solution is stirred at 50°C for 2 hours to obtain the core material. The mass of berberine is 20% of the mass of the ethanol solution. S2: Chitosan and gum arabic are dissolved in a 1% acetic acid solution at a mass ratio of 1:1 to prepare a wall material; S3: Disperse the core material obtained in S1 into the wall material, adjust the pH to 4.5 with 1% dilute alkali solution, stir and react for 1 hour to obtain an emulsion; S4: After cooling the emulsion to room temperature, centrifuge to obtain a precipitate. Wash the precipitate three times alternately with deionized water and anhydrous ethanol at 4°C. Place the product in a freeze-drying pan and pre-freeze at -45°C for 5 hours. Then transfer it to a freeze dryer and freeze-dry at -55°C and a vacuum of 15 Pa for 36 hours to obtain antibacterial microcapsules.
[0022] Preparation of poplar polyphenol extract: Poplar bark powder was mixed with 60% ethanol aqueous solution at a solid-liquid ratio of 1:9 to obtain a second mixture. The second mixture was refluxed twice at 80℃ for 1.5 h each time. The extracts were combined and filtered to obtain a filtrate. The filtrate was concentrated under reduced pressure to remove ethanol. The obtained product was freeze-dried to obtain poplar polyphenol extract.
[0023] Preparation of antibacterial synergists: Step 1: Poplar polyphenol extract is dissolved in deionized water and stirred at 55°C for 30 minutes to obtain the first mixture, wherein the mass of poplar polyphenol extract is 5% of the mass of deionized water; Step 2: Add zirconium oxychloride powder to the first mixture and mix well, wherein the mass of zirconium oxychloride is 25% of the mass of poplar polyphenol extract; Step 3: After mixing the first mixture with zirconium oxychloride powder, maintain the temperature at 50°C and continue the reaction for 2.5 hours. After the reaction is completed, allow it to cool to room temperature. The resulting product is then centrifuged, washed with ethanol, dried, and ground to obtain an antibacterial synergist.
[0024] The organic solvent used is N,N-dimethylformamide.
[0025] The emulsifier used is gum arabic.
[0026] The viscosity modifier is selected from fumed silica.
[0027] Raw material preparation: 100 parts polyurethane resin, 350 parts organic solvent, 15 parts antibacterial microcapsules, 3 parts emulsifier, 1 part viscosity modifier, 2 parts antibacterial synergist. Preparation of antibacterial polyurethane fibers for socks: Step 1: Dissolve polyurethane resin in an organic solvent to obtain a stock solution. Add antibacterial microcapsules, emulsifier, viscosity modifier and antibacterial synergist to the stock solution, stir and mix evenly to obtain a mixture. Step 2: After degassing and filtration, the mixture is injected into a coagulation bath using wet spinning technology to form nascent fibers. Step 3: Wash the nascent fibers with 50°C hot water. After washing, heat stretch them in a 70°C hot medium, then oil them. The resulting product is dried and heat-set at 100°C. The resulting product is then wound to obtain antibacterial polyurethane fiber for socks.
[0028] Example 2
[0029] Preparation of antibacterial microcapsules: S1: Berberine and ellagic acid are dissolved together in a 50% ethanol solution at a mass ratio of 1:1, and the solution is stirred at 60°C for 3 hours to obtain the core material. The mass of berberine is 20% of the mass of the ethanol solution. S2: Chitosan and gum arabic are dissolved in a 1% acetic acid solution at a mass ratio of 1:1.5 to prepare a wall material; S3: Disperse the core material obtained in S1 into the wall material, adjust the pH to 5.0 with dilute alkali solution, stir and react for 1.5 h to obtain an emulsion; S4: After cooling the emulsion to room temperature, centrifuge to obtain a precipitate. Wash the precipitate three times alternately with deionized water and anhydrous ethanol at 4°C. Place the product in a freeze-drying pan and pre-freeze at -45°C for 5 hours. Then transfer it to a freeze dryer and freeze-dry at -55°C and a vacuum of 15 Pa for 36 hours to obtain antibacterial microcapsules.
[0030] Preparation of poplar polyphenol extract: Poplar bark powder was mixed with 60% ethanol aqueous solution at a solid-liquid ratio of 1:10 to obtain a second mixture. The second mixture was refluxed twice at 85℃ for 2 hours each time. The extracts were combined and filtered to obtain a filtrate. The filtrate was concentrated under reduced pressure to remove ethanol. The obtained product was freeze-dried to obtain poplar polyphenol extract.
[0031] Preparation of antibacterial synergists: Step 1: Poplar polyphenol extract is dissolved in deionized water and stirred at 60°C for 30 minutes to obtain the first mixture, wherein the mass of poplar polyphenol extract is 5% of the mass of deionized water; Step 2: Add zirconium oxychloride powder to the first mixture and mix well, wherein the mass of zirconium oxychloride is 35% of the mass of poplar polyphenol extract; Step 3: After mixing the first mixture with zirconium oxychloride powder, maintain the temperature at 50°C and continue the reaction for 3 hours. After the reaction is completed, wait for it to cool to room temperature. The resulting product is then centrifuged, washed with ethanol, dried, and ground to obtain an antibacterial synergist.
[0032] The organic solvent used is N,N-dimethylformamide.
[0033] The emulsifier used is gum arabic.
[0034] The viscosity modifier is selected from fumed silica.
[0035] Raw material preparation: 100 parts polyurethane resin, 400 parts organic solvent, 22 parts antibacterial microcapsules, 6 parts emulsifier, 3 parts viscosity modifier, 4 parts antibacterial synergist. Preparation of antibacterial polyurethane fibers for socks: Step 1: Dissolve polyurethane resin in an organic solvent to obtain a stock solution. Add antibacterial microcapsules, emulsifier, viscosity modifier and antibacterial synergist to the stock solution, stir and mix evenly to obtain a mixture. Step 2: After degassing and filtration, the mixture is injected into a coagulation bath using wet spinning technology to form nascent fibers. Step 3: Wash the nascent fibers with 60℃ hot water. After washing, heat stretch them in a hot medium at 80℃, then oil them. The resulting product is dried and heat-set at 125℃. The resulting product is then wound to obtain antibacterial polyurethane fiber for socks.
[0036] Example 3
[0037] Preparation of antibacterial microcapsules: S1: Berberine and ellagic acid are dissolved together in a 50% ethanol solution at a mass ratio of 1:2, and the mixture is stirred at 65°C for 4 hours to obtain the core material. The mass of berberine is 20% of the mass of the ethanol solution. S2: Chitosan and gum arabic are dissolved in a 1% acetic acid solution at a mass ratio of 1:2 to obtain a wall material; S3: Disperse the core material obtained in S1 into the wall material, adjust the pH to 5.5 with dilute alkali solution, stir and react for 2 hours to obtain an emulsion; S4: After cooling the emulsion to room temperature, centrifuge to obtain a precipitate. Wash the precipitate three times alternately with deionized water and anhydrous ethanol at 4°C. Place the product in a freeze-drying pan and pre-freeze at -45°C for 5 hours. Then transfer it to a freeze dryer and freeze-dry at -55°C and a vacuum of 15 Pa for 36 hours to obtain antibacterial microcapsules.
[0038] Preparation of poplar polyphenol extract: Poplar bark powder was mixed with 60% ethanol aqueous solution at a solid-liquid ratio of 1:11 to obtain a second mixture. The second mixture was refluxed twice at 90℃ for 2.5 h each time. The extracts were combined and filtered to obtain a filtrate. The filtrate was concentrated under reduced pressure to remove ethanol. The obtained product was freeze-dried to obtain poplar polyphenol extract.
[0039] Preparation of antibacterial synergists: Step 1: Poplar polyphenol extract is dissolved in deionized water and stirred at 65°C for 30 minutes to obtain the first mixture, wherein the mass of poplar polyphenol extract is 5% of the mass of deionized water; Step 2: Add zirconium oxychloride powder to the first mixture and mix well, wherein the mass of zirconium oxychloride is 40% of the mass of poplar polyphenol extract; Step 3: After mixing the first mixture with zirconium oxychloride powder, maintain the temperature at 50°C and continue the reaction for 3.5 hours. After the reaction is completed, allow it to cool to room temperature. The resulting product is then centrifuged, washed with ethanol, dried, and ground to obtain an antibacterial synergist.
[0040] The organic solvent is N,N-dimethylformamide.
[0041] The emulsifier is gum arabic.
[0042] The viscosity modifier is fumed silica.
[0043] Raw material preparation: 100 parts polyurethane resin, 450 parts organic solvent, 30 parts antibacterial microcapsules, 8 parts emulsifier, 5 parts viscosity modifier, 6 parts antibacterial synergist. Preparation of antibacterial polyurethane fibers for socks: Step 1: Dissolve polyurethane resin in an organic solvent to obtain a stock solution. Add antibacterial microcapsules, emulsifier, viscosity modifier and antibacterial synergist to the stock solution, stir and mix evenly to obtain a mixture. Step 2: After degassing and filtration, the mixture is injected into a coagulation bath using wet spinning technology to form nascent fibers. Step 3: The nascent fibers are washed with 70°C hot water. After washing, they are hot-stretched in a 95°C hot medium, then oiled. The resulting product is dried and heat-set at 130°C. The resulting product is then wound to obtain antibacterial polyurethane fiber for socks.
[0044] Comparative Example 1: The antibacterial polyurethane fiber for socks and its preparation method provided in this comparative example are largely the same as those in Example 1, except that the addition of antibacterial microcapsules is omitted.
[0045] Comparative Example 2: The antibacterial polyurethane fiber for socks and its preparation method provided in this comparative example are generally the same as those in Example 1, except that the antibacterial synergist is omitted.
[0046] Comparative Example 3: The antibacterial polyurethane fiber for socks and its preparation method provided in this comparative example are largely the same as those in Example 1, except that ordinary berberine powder is used instead of antibacterial microgels.
[0047] Comparative Example 4: The antibacterial polyurethane fiber for socks and its preparation method provided in this comparative example are generally the same as those in Example 1, except that nano-silver particles are used instead of the antibacterial capsules and antibacterial synergists of this invention.
[0048] Performance testing: The polymers for power cable insulation prepared in Examples 1, 2, 3, 1, 2, 3, and 4 were subjected to performance testing, and the test data are recorded in the table below: sample Antibacterial rate (%) Antibacterial retention rate (%) Fracture strength (cN / tex) Example 1 98.2 95.1 2.86 Example 2 98.5 96.3 2.91 Example 3 98.8 96.7 2.88 Comparative Example 1 72.3 45.6 2.87 Comparative Example 2 88.6 68.4 2.86 Comparative Example 3 85.2 52.7 2.83 Comparative Example 4 90.5 71.2 2.60 Test method: Antibacterial performance test: Refer to GB / T 20944.3-2008 to test the inhibition rate against Staphylococcus aureus and Candida albicans, and record it as R0.
[0049] Antibacterial retention rate test: Wash 50 times according to GB / T 12490-2014 standard, and then test the antibacterial rate according to GB / T 20944.3-2008 standard. Record it as R1, and calculate the antibacterial retention rate. The calculation formula is R1 / R0×100%.
[0050] Mechanical property testing: The fiber breaking strength was tested in accordance with GB / T 3916-2013.
[0051] As shown in Comparative Example 1 in the table, after removing the addition of antibacterial microcapsules, the antibacterial performance significantly decreased when relying solely on the basic polyurethane resin and other additives. The antibacterial retention rate after washing also decreased significantly. This is because the lack of a pH-responsive release mechanism of microcapsules prevents the continuous release of antibacterial components in the moist and slightly acidic environment of the feet, resulting in a short-lived antibacterial effect that is easily washed away. Furthermore, the absence of microcapsules exposes the antibacterial components directly to the fiber system, making them prone to loss during processing and use, further weakening the durability of the antibacterial effect. This invention improves the utilization rate and durability of antibacterial components through the encapsulation and slow-release function of microcapsules, solving the problem of easy attenuation of antibacterial function after washing of traditional antibacterial fibers.
[0052] As can be seen from the data in Comparative Example 2 in the table, although the microcapsules still provide a certain antibacterial ability after the antibacterial synergist is removed, its antibacterial rate and wash resistance are significantly lower than those of the embodiments of the present invention. The antibacterial synergist can not only enhance the antibacterial activity of the berberine-ellagic acid system, but also stabilize the antibacterial components through metal-polyphenol coordination, delay release and improve its dispersibility and binding force in the fiber. Without this synergist, the synergistic effect between antibacterial components is weakened, resulting in a weakened inhibitory effect on fungal microorganisms.
[0053] As shown in Comparative Example 3 in the table, the initial antibacterial performance of directly adding ordinary berberine powder is acceptable, but the antibacterial rate drops sharply after washing. This indicates that the unencapsulated antibacterial components are easily lost during the washing process, resulting in low antibacterial efficiency and poor durability. This invention effectively protects the active ingredients by microencapsulating berberine-ellagic acid hybrid crystals, thereby significantly improving the antibacterial durability while maintaining the mechanical properties of the fiber.
[0054] As can be seen from the data in Comparative Example 4 in the table, although the antibacterial rate of nano-silver particles, a traditional silver-based antibacterial agent, is high in the early stage, the washability is poor and the breaking strength is significantly reduced. This indicates that the introduction of silver particles will affect the fiber formation and the mechanical properties of the material.
[0055] The comparative analysis of the above comparative examples and embodiments shows that the present invention achieves high efficiency, durability and environmental friendliness of antibacterial performance by using antibacterial microcapsules and antibacterial synergists, thereby improving the overall performance and market competitiveness of polyurethane fibers for socks.
[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0057] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. An antibacterial polyurethane fiber for socks, characterized in that, It is composed of the following raw materials in parts by weight: 100 parts polyurethane resin, 350-450 parts organic solvent, 15-30 parts antibacterial microcapsules, 3-8 parts emulsifier, 1-5 parts viscosity modifier, and 2-6 parts antibacterial synergist.
2. The antibacterial polyurethane fiber for socks according to claim 1, characterized in that, The antibacterial microcapsules are prepared by the following method: S1: Berberine and ellagic acid are dissolved together in a 50% ethanol solution at a mass ratio of 1:(0.5-2), and the mixture is stirred at 50-65℃ for 2-4 hours to obtain the core material. The mass of berberine is 20% of the mass of the ethanol solution. S2: Chitosan and gum arabic are dissolved in a 1% acetic acid solution at a mass ratio of 1:(1-2) to prepare a wall material; S3: Disperse the core material obtained in S1 into the wall material, adjust the pH to 4.5-5.5 with dilute alkali solution, stir and react for 1-2 hours to obtain an emulsion; S4: After cooling the emulsion to room temperature, centrifuge to obtain a precipitate. Wash the precipitate three times alternately with deionized water and anhydrous ethanol at 4°C. Place the product in a freeze-drying pan and pre-freeze at -45°C for 5 hours. Then transfer it to a freeze dryer and freeze-dry at -55°C and a vacuum of 15 Pa for 36 hours to obtain antibacterial microcapsules.
3. The antibacterial polyurethane fiber for socks according to claim 1, characterized in that, The antibacterial synergist is prepared by the following method: Step 1: Poplar polyphenol extract is dissolved in deionized water and stirred at 55-65℃ for 30 minutes to obtain the first mixture, wherein the mass of poplar polyphenol extract is 5% of the mass of deionized water; Step 2: Add zirconium oxychloride powder to the first mixture and mix well, wherein the mass of zirconium oxychloride is 25%-40% of the mass of poplar polyphenol extract; Step 3: After mixing the first mixture with zirconium oxychloride powder, maintain the temperature at 50°C and continue the reaction for 2.5-3.5 hours. After the reaction is completed, allow it to cool to room temperature. The resulting product is then centrifuged, washed with ethanol, dried, and ground to obtain the antibacterial synergist.
4. The antibacterial polyurethane fiber for socks according to claim 3, characterized in that, The poplar polyphenol extract is prepared by the following method: poplar bark powder is mixed with a 60% ethanol aqueous solution at a solid-liquid ratio of 1:(9-11) to obtain a second mixture. The second mixture is refluxed twice at 80-90℃ for 1.5-2.5 hours each time. The extracts are combined and filtered to obtain a filtrate. The filtrate is concentrated under reduced pressure to remove ethanol. The obtained product is freeze-dried to obtain the poplar polyphenol extract.
5. The antibacterial polyurethane fiber for socks according to claim 2, characterized in that, The dilute alkaline solution mentioned in S3 is a sodium bicarbonate solution with a concentration of 1-5%.
6. The antibacterial polyurethane fiber for socks according to claim 1, characterized in that, The organic solvent used is N,N-dimethylformamide.
7. The antibacterial polyurethane fiber for socks according to claim 1, characterized in that, The emulsifier used is gum arabic.
8. The antibacterial polyurethane fiber for socks according to claim 1, characterized in that, The viscosity modifier is selected from fumed silica.
9. The method for preparing antibacterial polyurethane fiber for socks according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Dissolve polyurethane resin in an organic solvent to obtain a stock solution. Add antibacterial microcapsules, emulsifier, viscosity modifier and antibacterial synergist to the stock solution, stir and mix evenly to obtain a mixture. Step 2: After degassing and filtration, the mixture is injected into a coagulation bath using wet spinning technology to form nascent fibers. Step 3: Wash the nascent fibers with hot water at 50-70℃. After washing, heat stretch them in a hot medium at 70-95℃, then oil them. The resulting product is dried and heat-set at 100-130℃. The resulting product is then wound to obtain antibacterial polyurethane fiber for socks.