Preparation method of antibacterial thermoplastic polyurethane elastic band

Abstract

The invention discloses a preparation method of an antibacterial thermoplastic polyurethane elastic band, and belongs to the technical field of functional polymer material preparation. The antibacterial thermoplastic polyurethane elastic band is prepared by the following steps: preparing a lactic acid-caprolactone copolymer from lactide and caprolactone through ring-opening polymerization, sequentially chemically bonding isocyanate and maleic anhydride to the lactic acid-caprolactone copolymer to prepare an isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride, and then, carrying out high-temperature curing on the isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride to obtain the antibacterial thermoplastic polyurethane elastic band. And finally, sequentially carrying out surface treatment on the polyester type thermoplastic polyurethane elastic band by using an isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride solution and a tea polyphenol solution. The thermoplastic polyurethane elastic band prepared by the invention has excellent mechanical property and long-acting antibacterial property, is mainly applied to the part attached to the human skin in the field of clothing, and has remarkable economic value and social benefit.

Description

Technical Field

[0001] The invention belongs to the technical field of functional polymer material preparation, and in particular relates to a method for preparing an antibacterial thermoplastic polyurethane elastic band. Background Art

[0002] Thermoplastic polyurethane elastic bands are widely used in the fields of clothing, footwear, electronics, automobiles, and medical devices due to their high modulus, high strength, high elongation, and high elasticity, as well as excellent wear resistance, oil resistance, low temperature resistance, and aging resistance. When used in the field of clothing, thermoplastic polyurethane elastic bands are mainly used as shoulder straps or back straps for underwear and swimwear, and waist circumferences for underwear, tights, and other clothing. Therefore, the thermoplastic polyurethane elastic band fits the skin tightly during use. In addition, the poor air permeability of the thermoplastic polyurethane elastic band causes the sweat discharged from the human skin to be unable to evaporate in time. Therefore, bacteria will inevitably breed in the area where the thermoplastic polyurethane elastic band contacts the human skin, causing itching, redness, and swelling in the area. Summary of the invention

[0003] The invention aims at the problem that bacteria are easily bred at the parts where thermoplastic polyurethane elastic bands contact human skin. The invention provides a method for preparing an antibacterial thermoplastic polyurethane elastic band. The thermoplastic polyurethane elastic band prepared by the invention has excellent mechanical properties and long-lasting antibacterial properties, is mainly used at the parts that contact human skin in the field of clothing, and has significant economic value and social benefits.

[0004] To achieve the above object, the present invention adopts the following technical solution: An antibacterial thermoplastic polyurethane elastic band is prepared by firstly using lactide and caprolactone to prepare a lactic acid-caprolactone copolymer by ring-opening polymerization, then chemically bonding isocyanate and maleic anhydride to the lactic acid-caprolactone copolymer in sequence to prepare an isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride, and finally surface treating the polyester-type thermoplastic polyurethane elastic band with an isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride solution and a tea polyphenol solution in sequence; the specific steps include: (1) Under nitrogen atmosphere, 5-10 g of lactide and 4-6 g of caprolactone were mechanically stirred at 60-100 °C for 1-2 h, and then 1-3 g of tin isooctanoate was added. The mixture was mechanically stirred at 110-130 °C for 18-36 h, washed with ethanol, and vacuum dried at 60 °C for 24 h to obtain lactic acid-caprolactone copolymer. (2) Under nitrogen atmosphere, 5-10 g of lactic acid-caprolactone copolymer was first added to 100-200 mL of ethyl acetate, and mechanically stirred at room temperature for 1-2 h. Then, 2-6 g of diphenylmethane-4,4'-diisocyanate was added, and mechanical stirring was continued at 60-80 °C for 6-10 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer. (3) Under nitrogen atmosphere, 6-10 g of isocyanate-terminated lactic acid-caprolactone copolymer was first added to 100-200 mL of ethyl acetate, and mechanically stirred at room temperature for 1-2 h. Then, 1-3 g of maleic anhydride was added, and mechanical stirring was continued at room temperature for 10-20 min. Finally, 0.01-0.05 g of azobisisobutyronitrile was added, and mechanical stirring was continued at 60-80 °C for 6-12 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. (4) First, 1000-1500 g of polyester thermoplastic polyurethane, 10-50 g of matting agent and 1-3 g of octadecyl erucic acid amide are mixed at high speed at room temperature for 2-5 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucic acid amide, and then the primary mixture is melt-extruded, and subjected to release cooling, pulling, shaping and heat treatment to obtain a polyester thermoplastic polyurethane elastic band; (5) Add 0.1-0.2 g of stannous octoate and 3-30 g of isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride into 100-500 mL of toluene, and mechanically stir at room temperature for 1-2 h to prepare a primary treatment solution. Then, immerse the polyester thermoplastic polyurethane elastic band into the primary treatment solution at a temperature of 80-120 °C for 3-6 min. After washing with toluene and vacuum drying at 80 °C for 24 h, a primary treatment polyester thermoplastic polyurethane elastic band is obtained. (6) Add 10-20 g of N,N'-dicyclohexylcarbodiimide and 20-60 g of tea polyphenols into 200-500 mL of acetonitrile, and mechanically stir at room temperature for 30-60 min to obtain a secondary treatment solution. Then, immerse the primary treated polyester thermoplastic polyurethane elastic band into the secondary treatment solution at a treatment liquid temperature of 60-80 °C for 2-4 min. After washing with acetonitrile and vacuum drying at 60 °C for 24 h, a secondary treated polyester thermoplastic polyurethane elastic band is obtained, which is the antibacterial thermoplastic polyurethane elastic band.

[0005] The melt extrusion in step (4) has a melt temperature of 160-190°C, an extrusion speed of 10-20 m / min, and a draw ratio of 1.1-1.3.

[0006] The significant advantages of the present invention are: (1) When used in the field of clothing, traditional thermoplastic polyurethane elastic bands fit closely to human skin, and bacteria easily breed at the contacting parts, causing itching, redness and swelling of human skin and other problems. The present invention uses isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride solution and tea polyphenol solution to sequentially surface treat polyester-type thermoplastic polyurethane elastic bands to obtain antibacterial thermoplastic polyurethane elastic bands. Through the broad-spectrum antibacterial effect of tea polyphenols, the growth of bacteria at the contacting parts of thermoplastic polyurethane elastic bands and human skin can be effectively inhibited, significantly improving the comfort of clothing.

[0007] (2) The present invention first uses lactide and caprolactone to prepare a lactic acid-caprolactone copolymer through ring-opening polymerization, and then chemically bonds isocyanate and maleic anhydride to the lactic acid-caprolactone copolymer in sequence to prepare an isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. In the process of sequentially surface treating the polyester-type thermoplastic polyurethane elastic band with an isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride solution and a tea polyphenol solution, the tea polyphenol is chemically bonded to the surface of the thermoplastic polyurethane elastic band through the reaction of the isocyanate group with the secondary amine group of the thermoplastic polyurethane, and the reaction of the maleic anhydride with the phenolic hydroxyl group of the tea polyphenol, which can significantly improve the stability of the tea polyphenol on the surface of the thermoplastic polyurethane elastic band, and fully endow the thermoplastic polyurethane elastic band with long-lasting antibacterial properties.

[0008] (3) The present invention uses isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride solution and tea polyphenol solution to directly treat the polyester-type thermoplastic polyurethane elastic band, which has the advantages of simple treatment process and low amount of treatment agent. At the same time, lactic acid-caprolactone copolymer and tea polyphenol are biodegradable polymer materials or natural antibacterial materials, have good biocompatibility and biodegradability, are green and environmentally friendly, conform to the national environmental protection concept, and meet the requirements of sustainable development.

[0009] (4) The thermoplastic polyurethane elastic band prepared by the present invention has excellent mechanical properties and long-term antibacterial properties, with a tensile strength of 29.4-32.5 MPa, an elongation at break of 408-468%, an antibacterial rate of 84.4-87.2%, and an antibacterial rate of 75.3-77.7% after being immersed in artificial sweat for 7 days. It is mainly used in the field of clothing in contact with human skin, with significant economic value and social benefits. DETAILED DESCRIPTION

[0010] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods, but the present invention is not limited thereto.

[0011] (1) Under nitrogen atmosphere, 8 g of lactide and 5 g of caprolactone were mechanically stirred at 80 °C for 1.5 h, and then 2 g of tin isooctanoate was added. The mixture was mechanically stirred at 120 °C for 27 h, washed with ethanol, and vacuum dried at 60 °C for 24 h to obtain lactic acid-caprolactone copolymer. (2) Under nitrogen atmosphere, 8 g of lactic acid-caprolactone copolymer was first added to 150 mL of ethyl acetate and mechanically stirred at room temperature for 1.5 h. Then, 4 g of diphenylmethane-4,4'-diisocyanate was added and mechanical stirring was continued at 70 °C for 8 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer. (3) Under nitrogen atmosphere, 8 g of isocyanate-terminated lactic acid-caprolactone copolymer was first added to 150 mL of ethyl acetate and mechanically stirred at room temperature for 1.5 h. Then, 2 g of maleic anhydride was added and mechanically stirred at room temperature for 15 min. Finally, 0.03 g of azobisisobutyronitrile was added and mechanically stirred at 70 °C for 9 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. (4) First, 1200 g of polyester thermoplastic polyurethane, 60 g of matting agent and 2 g of octadecyl erucic acid amide were mixed at high speed at room temperature for 4 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucic acid amide, and then the primary mixture was melt-extruded, and subjected to release cooling, pulling, shaping and heat treatment to obtain a polyester thermoplastic polyurethane elastic band; (5) 0.15 g of stannous octoate and 16 g of isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride were added to 300 mL of toluene and mechanically stirred at room temperature for 1.5 h to obtain a primary treatment solution. The polyester thermoplastic polyurethane elastic band was then immersed in the primary treatment solution at a temperature of 100 °C for 5 min. The band was washed with toluene and vacuum dried at 80 °C for 24 h to obtain a primary treatment polyester thermoplastic polyurethane elastic band. (6) Add 15 g of N,N'-dicyclohexylcarbodiimide and 40 g of tea polyphenols into 350 mL of acetonitrile and mechanically stir at room temperature for 45 min to obtain a secondary treatment solution. Then immerse the primary treated polyester thermoplastic polyurethane elastic band into the secondary treatment solution at a treatment liquid temperature of 70 °C for 3 min. After washing with acetonitrile and vacuum drying at 60 °C for 24 h, a secondary treated polyester thermoplastic polyurethane elastic band is obtained, which is the antibacterial thermoplastic polyurethane elastic band.

[0012] The melt extrusion in step (4) has a melt temperature of 175°C, an extrusion speed of 15 m / min, and a draw ratio of 1.2.

[0013] (1) Under nitrogen atmosphere, 5 g of lactide and 4 g of caprolactone were mechanically stirred at 60 °C for 2 h, and then 1 g of tin isooctanoate was added. The mixture was mechanically stirred at 110 °C for 36 h, washed with ethanol, and vacuum dried at 60 °C for 24 h to obtain lactic acid-caprolactone copolymer. (2) Under nitrogen atmosphere, 5 g of lactic acid-caprolactone copolymer was first added to 100 mL of ethyl acetate and mechanically stirred at room temperature for 1 h. Then, 2 g of diphenylmethane-4,4'-diisocyanate was added and mechanical stirring was continued at 60 °C for 10 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer. (3) Under nitrogen atmosphere, 6 g of isocyanate-terminated lactic acid-caprolactone copolymer was first added to 100 mL of ethyl acetate and mechanically stirred at room temperature for 1 h. Then 1 g of maleic anhydride was added and mechanically stirred at room temperature for 10 min. Finally, 0.01 g of azobisisobutyronitrile was added and mechanically stirred at 60 °C for 12 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. (4) First, 1000 g of polyester thermoplastic polyurethane, 10 g of matting agent and 1 g of octadecyl erucic acid amide were mixed at high speed at room temperature for 2 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucic acid amide, and then the primary mixture was melt-extruded, and after release cooling, pulling, shaping and heat treatment, a polyester thermoplastic polyurethane elastic band was obtained; (5) 0.1 g of stannous octoate and 3 g of isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride were added to 100 mL of toluene and mechanically stirred at room temperature for 1 h to obtain a primary treatment solution. The polyester thermoplastic polyurethane elastic band was then immersed in the primary treatment solution at a temperature of 80 °C for 6 min. The band was washed with toluene and vacuum dried at 80 °C for 24 h to obtain a primary treatment polyester thermoplastic polyurethane elastic band. (6) Add 10 g of N,N'-dicyclohexylcarbodiimide and 20 g of tea polyphenols into 200 mL of acetonitrile and mechanically stir at room temperature for 30 min to obtain a secondary treatment solution. Then immerse the primary treated polyester thermoplastic polyurethane elastic band into the secondary treatment solution at a treatment liquid temperature of 60 °C for 4 min. After washing with acetonitrile and vacuum drying at 60 °C for 24 h, a secondary treated polyester thermoplastic polyurethane elastic band is obtained, which is the antibacterial thermoplastic polyurethane elastic band.

[0014] The melt temperature of the melt extrusion in step (4) is 160°C, the extrusion speed is 10 m / min, and the pulling ratio is 1.1.

[0015] (1) Under nitrogen atmosphere, 10 g of lactide and 6 g of caprolactone were mechanically stirred at 100 °C for 1 h, and then 3 g of tin isooctanoate was added. The mixture was mechanically stirred at 130 °C for 18 h, washed with ethanol, and vacuum dried at 60 °C for 24 h to obtain a lactic acid-caprolactone copolymer. (2) Under nitrogen atmosphere, 10 g of lactic acid-caprolactone copolymer was first added to 200 mL of ethyl acetate and mechanically stirred at room temperature for 2 h. Then 6 g of diphenylmethane-4,4'-diisocyanate was added and mechanical stirring was continued at 80 °C for 6 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer. (3) Under nitrogen atmosphere, 10 g of isocyanate-terminated lactic acid-caprolactone copolymer was first added to 200 mL of ethyl acetate and mechanically stirred at room temperature for 2 h. Then 3 g of maleic anhydride was added and mechanically stirred at room temperature for 20 min. Finally, 0.05 g of azobisisobutyronitrile was added and mechanically stirred at 80 °C for 6 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. (4) First, 1500 g of polyester thermoplastic polyurethane, 50 g of matting agent and 3 g of octadecyl erucic acid amide were mixed at high speed at room temperature for 5 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucic acid amide, and then the primary mixture was melt-extruded, and after release cooling, pulling, shaping and heat treatment, a polyester thermoplastic polyurethane elastic band was obtained; (5) 0.2 g of stannous octoate and 30 g of isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride were added to 500 mL of toluene and mechanically stirred at room temperature for 2 h to obtain a primary treatment solution. The polyester thermoplastic polyurethane elastic band was then immersed in the primary treatment solution at a temperature of 120 °C for 3 min. The band was washed with toluene and vacuum dried at 80 °C for 24 h to obtain a primary treatment polyester thermoplastic polyurethane elastic band. (6) Add 20 g of N,N'-dicyclohexylcarbodiimide and 60 g of tea polyphenols into 500 mL of acetonitrile and mechanically stir at room temperature for 60 min to obtain a secondary treatment solution. Then immerse the primary treated polyester thermoplastic polyurethane elastic band into the secondary treatment solution at a treatment liquid temperature of 80 °C for 2 min. After washing with acetonitrile and vacuum drying at 60 °C for 24 h, a secondary treated polyester thermoplastic polyurethane elastic band is obtained, which is the antibacterial thermoplastic polyurethane elastic band.

[0016] The melt extrusion in step (4) has a melt temperature of 190°C, an extrusion speed of 20 m / min, and a drawing ratio of 1.3.

[0017] First, 1200 g of polyester thermoplastic polyurethane, 60 g of matte agent and 2 g of octadecyl erucamide were mixed at high speed at room temperature for 4 min to obtain a primary mixture of polyester thermoplastic polyurethane, matte agent and octadecyl erucamide, and then the primary mixture was melt-extruded, and the finished product was obtained through release cooling, pulling, shaping and heat treatment.

[0018] The melt extrusion had a melt temperature of 175° C., an extrusion speed of 15 m / min, and a draw ratio of 1.2.

[0019] (1) First, 1200 g of polyester thermoplastic polyurethane, 60 g of matting agent and 2 g of octadecyl erucamide were mixed at high speed at room temperature for 4 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucamide, and then the primary mixture was melt-extruded, and then subjected to release cooling, pulling, shaping and heat treatment to obtain a polyester thermoplastic polyurethane elastic band; (2) Add 15 g of N,N'-dicyclohexylcarbodiimide and 40 g of tea polyphenols into 350 mL of acetonitrile and mechanically stir at room temperature for 45 min to obtain a treatment solution. Then immerse the polyester thermoplastic polyurethane elastic band into the treatment solution at a temperature of 70 °C for 3 min. After vacuum drying at 60 °C for 24 h, the finished product is obtained.

[0020] The melt extrusion in step (1) has a melt temperature of 175°C, an extrusion speed of 15 m / min, and a draw ratio of 1.2.

[0021] The finished products prepared from the three groups of embodiments and two groups of comparative examples were immersed in artificial sweat with a pH value of 4.7 at 37°C, taken out regularly (1 d, 3 d and 7 d), washed with deionized water, and vacuum dried at 60°C for 2 h. The antibacterial rate of Escherichia coli was tested according to GBT 20944.3-2008, and the tensile strength and elongation at break were tested according to GB / T 1040.3-2006. The test results are shown in Table 1.

[0022] Table 1 Performance test results

[0023] It can be seen from the test results of the embodiments and comparative examples that the polyester thermoplastic polyurethane elastic band without surface treatment has almost no antibacterial effect, and the polyester thermoplastic polyurethane elastic band without chemical bonding surface treatment of tea polyphenols has a poor antibacterial effect and quickly loses its antibacterial property in artificial sweat. The present invention chemically bonds tea polyphenols to the surface of the thermoplastic polyurethane elastic band, which can significantly improve the stability of tea polyphenols on the surface of the thermoplastic polyurethane elastic band, and the obtained thermoplastic polyurethane elastic band has excellent mechanical properties and long-term antibacterial properties.

[0024] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, designing tire repair films with different structures does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing an antibacterial thermoplastic polyurethane elastic band, characterized in that: Firstly, lactide and caprolactone are used to prepare lactic acid-caprolactone copolymer by ring-opening polymerization, and then isocyanate and maleic anhydride are chemically bonded to the lactic acid-caprolactone copolymer in sequence to prepare isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride, and finally the polyester-type thermoplastic polyurethane elastic band is surface treated with isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride solution and tea polyphenol solution in sequence; The specific steps include: (1) Under nitrogen atmosphere, 5-10 g of lactide and 4-6 g of caprolactone were mechanically stirred at 60-100 °C for 1-2 h, and then 1-3 g of tin isooctanoate was added. The mixture was mechanically stirred at 110-130 °C for 18-36 h, washed with ethanol, and vacuum dried at 60 °C for 24 h to obtain a lactic acid-caprolactone copolymer. (2) Under nitrogen atmosphere, 5-10 g of lactic acid-caprolactone copolymer was first added to 100-200 mL of ethyl acetate, and mechanically stirred at room temperature for 1-2 h. Then, 2-6 g of diphenylmethane-4,4'-diisocyanate was added, and mechanical stirring was continued at 60-80 °C for 6-10 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer. (3) Under nitrogen atmosphere, 6-10 g of isocyanate-terminated lactic acid-caprolactone copolymer was first added to 100-200 mL of ethyl acetate, and mechanically stirred at room temperature for 1-2 h. Then, 1-3 g of maleic anhydride was added, and mechanical stirring was continued at room temperature for 10-20 min. Finally, 0.01-0.05 g of azobisisobutyronitrile was added, and mechanical stirring was continued at 60-80 °C for 6-12 h. The mixture was washed with ethyl acetate and vacuum dried at 60 °C for 24 h to obtain isocyanate-terminated lactic acid-caprolactone copolymer grafted with maleic anhydride. (4) First, 1000-1500 g of polyester thermoplastic polyurethane, 10-50 g of matting agent and 1-3 g of octadecyl erucic acid amide are mixed at high speed at room temperature for 2-5 min to obtain a primary mixture of polyester thermoplastic polyurethane, matting agent and octadecyl erucic acid amide, and then the primary mixture is melt-extruded, and subjected to release cooling, pulling, shaping and heat treatment to obtain a polyester thermoplastic polyurethane elastic band; (5) Add 0.1-0.2 g of stannous octoate and 3-30 g of isocyanate-terminated lactic acid-caprolactone copolymer grafted maleic anhydride into 100-500 mL of toluene, and mechanically stir at room temperature for 1-2 h to prepare a primary treatment solution. Then, immerse the polyester thermoplastic polyurethane elastic band into the primary treatment solution at a temperature of 80-120 °C for 3-6 min. After washing with toluene and vacuum drying at 80 °C for 24 h, a primary treatment polyester thermoplastic polyurethane elastic band is obtained. (6) Add 10-20 g of N,N'-dicyclohexylcarbodiimide and 20-60 g of tea polyphenols into 200-500 mL of acetonitrile, and mechanically stir at room temperature for 30-60 min to obtain a secondary treatment solution. Then, immerse the primary treated polyester thermoplastic polyurethane elastic band into the secondary treatment solution at a treatment liquid temperature of 60-80 °C for 2-4 min. After washing with acetonitrile and vacuum drying at 60 °C for 24 h, a secondary treated polyester thermoplastic polyurethane elastic band is obtained, which is the antibacterial thermoplastic polyurethane elastic band.

2. The method for preparing the antibacterial thermoplastic polyurethane elastic band according to claim 1, characterized in that: The melt extrusion in step (4) has a melt temperature of 160-190°C, an extrusion speed of 10-20 m / min, and a draw ratio of 1.1-1.3.

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