Fiber with bactericidal and antiviral functions, preparation method and application thereof

Abstract

The present invention belongs to the field of fiber material preparation and protective products, specifically relating to a fiber with antibacterial and antiviral properties, its preparation method, and its application. The fiber comprises the following components: resin particles, a dispersed polymer, and a bactericide. By pre-dissolving the inorganic bactericide in a solvent, adding it to the polymer, and then dispersing it using ultrasonic waves, the antibacterial polymer is obtained, in which the antibacterial agent is evenly distributed, effectively preventing agglomeration. Subsequently, the fiber with antibacterial and antiviral properties and excellent tensile strength is produced through melt spinning.

Description

Technical Field

[0001] The present invention belongs to the field of fiber material preparation and protective products, and particularly relates to a fiber with bactericidal and antiviral functions, a preparation method thereof, and an application thereof. Background Art

[0002] Bacteria and viruses are common pathogens. The battle between humans and bacteria has always been an ongoing one. Bacteria and viruses can infect in numerous ways. Textile fabrics, composed of fibers, are porous and contain polymers that facilitate microbial attachment, making them ideal hosts for microbial survival and reproduction. These parasites, in addition to harming humans, can also contaminate the fabric.

[0003] Therefore, it is of great significance to develop fibers and fabrics that have bactericidal and antiviral functions, good breathability and can be washed repeatedly.

[0004] Currently, antimicrobial agents in washable antimicrobial fibers are divided into organic and inorganic antimicrobial agents. Organic antimicrobial agents are primarily quaternary ammonium salts. For example, CN 108239881 A uses a co-irradiation grafting method to produce an antimicrobial, washable, quaternized fiber. CN 110079882 A blends nano-taiji stones co-modified with n-dodecyl groups and quaternary ammonium salt groups with polypropylene particles to produce a quaternized fiber. Organic antimicrobial agents have the characteristics of rapid sterilization and high antimicrobial efficacy, but they suffer from poor heat resistance and insufficient durability.

[0005] Inorganic antimicrobial agents include nano-titanium dioxide, nano-silver, nano-copper oxide, and nano-zinc oxide. Among these, the most commonly used inorganic antimicrobial agents are silver-based antimicrobial agents. For example, CN104727140A reports an antimicrobial fiber containing nano-silver. Nano-silver has a good bactericidal effect, but is relatively expensive, easily discolors under light, and silver has cumulative toxicity, limiting its application. CN113802205A reports an antimicrobial fiber containing nano-titanium dioxide particles. However, titanium dioxide primarily relies on ultraviolet light for sterilization, resulting in low light utilization efficiency, and titanium dioxide is a Class 2B carcinogen. Furthermore, copper-based antimicrobials are highly effective against fungi but very weak against bacteria. Zinc-based antimicrobials, on the other hand, are less effective against fungi. Furthermore, when nano-antimicrobial agents are added during the textile process, the particles can agglomerate during the spinning process, thereby affecting the fiber's spinnability and fiber strength. For example, CN104592629A reports a method for preparing a Cu / ZnO composite antibacterial masterbatch. The resulting PP chips exhibited good antibacterial properties, but the material's washability was not described. Furthermore, the material's elongation at break was only 60% of that of blank PP, indicating limited mechanical properties. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a fiber with bactericidal and antiviral functions and a preparation method and application thereof.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A fiber with bactericidal and antiviral functions comprises the following components: resin particles, dispersed polymers and bactericides.

[0009] The mass ratio of the bactericide to the dispersed polymer is 1:0-20, preferably 1:1-10, and more preferably 1:2-5. In the present application, the dispersed polymer not only acts as a solvent for dispersion, but also the lone pairs of electrons on the oxygen atoms in the dispersed polymer form weak ionic bonds with the metal ions of the bactericide; therefore, a relatively large amount of dispersed polymer is required. If the amount of dispersed polymer is too small, such as when the mass ratio of the bactericide to the dispersed polymer is higher than 1:1, such as 1:0.5, 1:0.3, etc., the bactericide will agglomerate and cannot be evenly dispersed; if the amount of dispersed polymer is too large, the performance and breaking strength of the fiber will be affected.

[0010] The mass ratio of the sum of the biocide and the dispersed polymer to the mass ratio of the resin particles is 10-50:60-200. If the mass ratio of the sum of the biocide and the dispersed polymer to the resin particles is lower than the range, the antibacterial performance will be reduced; if it is higher than the range, the yarn will break and a continuous spinning process cannot be formed.

[0011] The bactericide is one of bismuth trioxide, silver antibacterial agent, copper antibacterial agent, zinc antibacterial agent, titanium antibacterial agent, molybdenum antibacterial agent, and graphene antibacterial agent, or a mixture thereof.

[0012] Preferably, the fungicide is bismuth trioxide, and the particle size of bismuth trioxide is less than 14 microns and greater than 5 nanometers.

[0013] The dispersed polymer is any one of polyethylene glycol PEG, polypropylene glycol PPG, and polytetramethylene glycol PTMG.

[0014] The resin particles are selected from resins with a processing temperature below 300° C., such as at least one of polypropylene (PP), polyethylene (PE), ethylene-vinyl acetate copolymer (EVA) and polyurethane (PU).

[0015] Preferably, the resin particles are one of polypropylene (PP) with a melt spinning temperature not exceeding 240°C.

[0016] The present invention also includes a method for preparing the fiber having bactericidal and antiviral functions, which is characterized by comprising the following steps:

[0017] S1: adding a bactericide to a solvent, adding the bactericide to a dispersed polymer, uniformly dispersing the bactericide through ultrasonication, removing the solvent, and fully drying to obtain a bactericidal polymer in which bismuth trioxide is uniformly dispersed; the solvent is any one of water, ethanol, isopropanol, and methanol;

[0018] S2: adding the bactericidal polymer obtained in step S1 to the resin particles in proportion, and preparing fibers with bactericidal and antiviral functions and good tensile strength by melt spinning;

[0019] Alternatively, the bactericidal polymer obtained in step S1 is added to the resin particles in proportion and blended to prepare an antibacterial masterbatch; the antibacterial masterbatch is blended with the resin particles and melt-spinned to prepare a fiber with bactericidal and antiviral functions and good tensile strength.

[0020] Preferably, the ultrasonic dispersion in step S1 uses an ultrasonic power of 100-5000 watts and a time of 5-30 minutes.

[0021] Preferably, the solvent is removed in step S1 by placing the mixture in a 60-80 degree blast oven after uniform ultrasonic dispersion.

[0022] Preferably, the temperature of the melt spinning in step S2 is 30 to 80° C. higher than the melting point of the resin, and the winding rate in the melt spinning is 500 to 2000 m / min.

[0023] Preferably, the take-up rate in the melt spinning in step S2 is 1150 m / min.

[0024] During the spinning process, a temperature 30 to 80°C above the melting point of the resin particles facilitates the disentanglement of polymer molecular chains, facilitating the bonding of the fungicide and resin particles. The fungicide powder particle size ranges from 5 nm to 14 μm, allowing the fungicide to be coated or semi-coated within the fiber matrix and surface, forming a tight interfacial bond while minimizing the impact on the mechanical properties of the resin fiber. The adjustable winding rate allows for a wide range of fiber diameters, facilitating the production of medium- and coarse-denier fibers (15 to 40 μm). The preferred winding rate during melt spinning is 1150 m / min. The antimicrobial material powder coated within and on the fiber matrix is less susceptible to filament breakage, making it suitable for the preparation of a variety of fiber fabrics.

[0025] The fiber with bactericidal and antiviral functions of the present invention is applied to woven fabrics and non-woven fabrics; the fiber, woven fabrics and non-woven fabrics have an inactivation rate of greater than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate against human coronavirus HcoV-229E greater than 90%, and an antiviral activity rate against influenza A virus H1N1 greater than 90%;

[0026] The fiber breaking strength reaches up to 4.6CN / dtex; the air permeability of the woven fabric prepared by the melt spinning and weaving process is ≥75mm / s, and the air permeability of the protective product prepared by the non-woven fabric process is ≥75mm / s;

[0027] After washing 50 times, the fiber had an inactivation rate of more than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans.

[0028] The fiber of the present invention can also be used in masks, gas masks, medical protective clothing, medical pads, air filters, fresh air, purifiers, home textiles, clothing, aircraft interiors, high-speed rail interiors, astronaut clothing, or military combat clothing.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1) The present invention dissolves the inorganic fungicide in a solvent in advance and then adds it to a dispersed polymer. The dispersed polymer contains oxygen atoms. The lone pair of electrons on the oxygen atoms can form a coordination effect with the metal cations in the fungicide, thereby surrounding and isolating the metal ions and avoiding the formation of agglomeration. Afterwards, ultrasonic dispersion is used to further obtain an antibacterial polymer with uniformly distributed antibacterial agents, thereby effectively avoiding the agglomeration phenomenon; then, a fiber with bactericidal and antiviral functions and good tensile strength is prepared by a melt spinning method. The polymer not only plays a role in solvent dispersion, but also the lone pair of electrons on the oxygen atoms in the polymer will form a weak ionic bond with the metal ions of the fungicide (as shown below, taking bismuth trioxide and PEG as an example); this complex-like form allows the fungicide to be uniformly dissolved in the polymer, thereby significantly eliminating the agglomeration phenomenon of the fungicide and contributing to a better uniform dispersion of the fungicide.

[0031]

[0032] 2) The fiber obtained by the present invention can be used in woven fabrics and non-woven fabrics; the fiber, woven fabrics and non-woven fabrics have an inactivation rate of greater than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate against human coronavirus HcoV-229E greater than 90%, and an antiviral activity rate against influenza A virus H1N1 greater than 90%; the fiber breaking strength can reach 4.6CN / dtex; and after washing 50 times, the fiber has an inactivation rate of greater than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans.

[0033] 3) The present invention applies a fungicide to fiber fabrics, and the resulting woven or non-woven fabric has good bactericidal ability against a variety of bacteria and fungi. Moreover, the antibacterial properties of the fibers and fabrics do not decrease after washing 50 times; at the same time, the fibers have good tensile strength.

[0034] 4) The fibers and fabrics with bactericidal and antiviral functions prepared by the present invention can be effectively used in masks, gas masks, medical protective clothing, medical pads, air filters, fresh air, purifiers, home textiles, clothing, aircraft, high-speed rail interiors, astronaut clothing, military combat clothing and other fields; the method of the present invention is simple to operate, efficient, and has long-lasting effectiveness, is conducive to large-scale production, and has broad application prospects. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that those skilled in the art may make several adjustments and improvements without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0036] Example 1

[0037] 100 g of bismuth trioxide (average particle size 100 nm, the same below) was added to 100 mL of water, and 400 g of PEG 400 was added. After ultrasonic dispersion (ultrasonic power 180 watts, 10 minutes) and uniform dispersion, the mixture was placed in a 70-degree forced air oven to remove the solvent and fully dried to obtain a polymer with uniform bismuth trioxide dispersion.

[0038] 500 g of the above polymer was melt-blended with 1500 g of polypropylene pellets and melt-spun into fibers; the melt-blending temperature was 200° C., the melt-spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0039] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated an antiviral activity greater than 92% against human coronavirus HCoV-229E and greater than 92% against influenza A virus H1N1. The fiber had a breaking strength of 4.2 CN / dtex. After 50 washes, the fiber demonstrated an inactivation rate greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans.

[0040] Example 2

[0041] 100 g of bismuth trioxide was added to 10 mL of water, and 400 g of PEG 2000 was added. The mixture was evenly dispersed by ultrasonication (ultrasonic power 180 watts, 10 minutes), and then placed in a 70-degree forced air oven to remove the solvent. After sufficient drying, a polymer with evenly dispersed bismuth trioxide was obtained.

[0042] 500 g of the above polymer was melt-blended with 1500 g of polypropylene pellets and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0043] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated antiviral activity against human coronavirus HCoV-229E and influenza A virus H1N1, exceeding 92%. The fiber also exhibited a breaking strength of 4.0 CN / dtex.

[0044] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0045] Example 3

[0046] 100 g of bismuth trioxide was added to 100 mL of water, and 900 g of PPG 4000 was added. The mixture was evenly dispersed by ultrasonication (ultrasonic power 180 watts, 10 minutes), and then placed in a 70-degree blast oven to remove the solvent. After sufficient drying, a polymer with evenly dispersed bismuth trioxide was obtained.

[0047] 500 g of the above polymer was melt-blended with 2000 g of polypropylene pellets and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0048] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated antiviral activity against human coronavirus HCoV-229E and influenza A virus H1N1, exceeding 91%. The fiber also exhibited a breaking strength of 4.5 CN / dtex.

[0049] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0050] Example 4

[0051] 10 g of nanosilver antibacterial agent (average particle size 100 nm) was added to 100 mL of water, and 900 g of PPG 4000 was added. After ultrasonic dispersion (ultrasonic power 180 watts, 10 minutes), the mixture was placed in a 70-degree blast oven to remove the solvent. After sufficient drying, a polymer with a uniform dispersion of the nanosilver antibacterial agent was obtained.

[0052] 500 g of the above polymer was melt-blended with 2000 g of polypropylene pellets and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0053] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated antiviral activity against human coronavirus HCoV-229E and influenza A virus H1N1, exceeding 90%. The fiber also exhibited a breaking strength of 3.5 CN / dtex.

[0054] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0055] Example 5

[0056] 100 g of nano-copper oxide antibacterial agent (average particle size 100 nm) was added to 100 mL of water, and 900 g of PPG 4000 was added. After ultrasonic dispersion (ultrasonic power 180 watts, 10 minutes) and uniform dispersion, the mixture was placed in a 70-degree blast oven to remove the solvent. After sufficient drying, a polymer with a uniform dispersion of the copper oxide antibacterial agent was obtained.

[0057] 500 g of the above polymer was melt-blended with 2000 g of polypropylene pellets and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0058] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate greater than 95% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated antiviral activity greater than 90% against human coronavirus HCoV-229E and greater than 90% against influenza A virus H1N1. The fiber also exhibited a breaking strength of 3.5 CN / dtex.

[0059] After being washed 50 times, the fiber has an inactivation rate of more than 95% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0060] Example 6

[0061] 100 g of bismuth trioxide was added to 100 mL of water, and 900 g of PTMG was added. After ultrasonic dispersion (ultrasonic power 180 watts, 10 minutes) was uniformly dispersed, the mixture was placed in a 70-degree blast oven to remove the solvent, and after sufficient drying, a polymer with bismuth trioxide uniformly dispersed was obtained.

[0062] 100 g of the above polymer was melt-blended with 900 g of polypropylene pellets and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0063] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated antiviral activity against human coronavirus HCoV-229E and influenza A virus H1N1, exceeding 90%. The fiber also exhibited a breaking strength of 4.6 CN / dtex.

[0064] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0065] Example 7

[0066] 100 g of bismuth trioxide was added to 100 mL of water, and 200 g of PTMG was added. After ultrasonic dispersion (ultrasonic power 180 watts, 10 minutes) was uniformly dispersed, the mixture was placed in a 70-degree blast oven to remove the solvent, and after sufficient drying, a polymer with bismuth trioxide uniformly dispersed was obtained.

[0067] 300 g of the above polymer, 700 g of polypropylene particles, 0.25 g of antioxidant 1010, 0.25 g of antioxidant 168 and 50 g of liquid paraffin were placed in a high-speed mixer for high-speed mixing. After being evenly mixed, the antibacterial masterbatch was obtained through a twin-screw extruder.

[0068] 100 g of the above antibacterial masterbatch was melt-blended with 900 g of polypropylene particles, and then spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the winding rate in the melt spinning was 1150 m / min.

[0069] The fiber has an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans, an antiviral activity rate of greater than 90% against human coronavirus HcoV-229E, and an antiviral activity rate of greater than 90% against influenza A virus H1N1. The fiber has a breaking strength of 4.6CN / dtex.

[0070] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0071] Example 8

[0072] 200 g of bismuth trioxide was added to 200 mL of water, and 200 g of PEG 2000 was added. The mixture was evenly dispersed by ultrasonication (ultrasonic power 180 watts, 10 minutes), and then placed in a 70-degree blast oven to remove the solvent. After sufficient drying, a polymer with evenly dispersed bismuth trioxide was obtained.

[0073] 400 g of the above polymer, 600 g of polypropylene particles, 0.25 g of antioxidant 1010, 0.25 g of antioxidant 168 and 50 g of liquid paraffin were placed in a high-speed mixer for mixing; high-speed mixing was performed, and after the mixture was uniformly mixed, the antibacterial masterbatch was obtained through a twin-screw extruder.

[0074] 500 g of the above-mentioned antibacterial masterbatch was melt-blended with 1500 g of polypropylene particles, and then spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the winding rate in the melt spinning was 1150 m / min.

[0075] The fiber has an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate of greater than 92% against human coronavirus HcoV-229E and an antiviral activity rate of greater than 92% against influenza A virus H1N1, and a breaking strength of 4.3CN / dtex.

[0076] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0077] Example 9

[0078] 100 g of bismuth trioxide was added to 100 mL of water, and 400 g of PEG 400 was added. The mixture was evenly dispersed by ultrasonication (ultrasonic power 180 watts, 10 minutes), and then placed in a 70-degree forced air oven to remove the solvent. After sufficient drying, a polymer with evenly dispersed bismuth trioxide was obtained.

[0079] 500 g of the above polymer was melt-blended with 1500 g of polyethylene particles and melt-spun into fibers; the melt-blending temperature was 160° C., the melt-spinning temperature was 180° C., and the take-up rate during melt spinning was 1150 m / min.

[0080] Tested according to GB / T 20944.2-2007 (Evaluation of Antimicrobial Properties of Textiles - Part 2 - Absorption Method), the resulting fiber demonstrated an inactivation rate greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also demonstrated an antiviral activity greater than 92% against human coronavirus HcoV-229E and greater than 92% against influenza A virus H1N1. After 50 washes, the fiber demonstrated an inactivation rate greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans.

[0081] Comparative Example 1

[0082] 100 g of bismuth trioxide and 1900 g of polypropylene particles were melt-blended and spun into fibers by melt spinning; the melt blending temperature was 200° C., the melt spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0083] The fiber has an inactivation rate of more than 96% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate of more than 90% against human coronavirus HcoV-229E, and an antiviral activity rate of more than 90% against influenza A virus H1N1. The fiber has a breaking strength of 3.5CN / dtex.

[0084] After being washed 50 times, the fiber has an inactivation rate of more than 95% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0085] Comparative Example 2

[0086] 100 g of bismuth trioxide was added to 100 mL of water, and 10 g of PEG 400 was added. The mixture was dispersed evenly by ultrasonication (ultrasonic power 180 watts, 10 minutes), and then placed in a 70°C forced air oven to remove the solvent. After thorough drying, the mixture was observed to have agglomeration.

[0087] 55 g of the above mixture was melt-blended with 945 g of polypropylene pellets and melt-spun into fibers; the melt-blending temperature was 200° C., the melt-spinning temperature was 220° C., and the take-up rate during melt spinning was 1150 m / min.

[0088] The fiber has an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate of greater than 92% against human coronavirus HcoV-229E and an antiviral activity rate of greater than 92% against influenza A virus H1N1, and a breaking strength of 3.6CN / dtex.

[0089] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0090] Comparative Example 3

[0091] 800g of polypropylene particles, 0.25g of antioxidant 1010, 0.25g of antioxidant 168 and 50g of liquid paraffin were put into a high-speed mixer for mixing, and then 200g of nano-bismuth trioxide was added for high-speed mixing. After mixing evenly, the antibacterial masterbatch was obtained through a twin-screw extruder.

[0092] Then, 500 g of the antibacterial masterbatch was melt-blended with 1500 g of polypropylene particles and spun into fibers by melt spinning at a temperature of 200° C., a temperature of 220° C., and a take-up rate of 1150 m / min.

[0093] The resulting fiber contains 5% antimicrobial agent, with an inactivation rate of greater than 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. It also exhibits an antiviral activity rate of greater than 90% against human coronavirus HcoV-229E and greater than 90% against influenza A virus H1N1. The fiber has a breaking strength of 3.2 CN / dtex.

[0094] After being washed 50 times, the fiber has an inactivation rate of more than 99% on Escherichia coli, Staphylococcus aureus and Candida albicans.

[0095] The above examples and comparative examples demonstrate that fibers produced by first uniformly dispersing the antimicrobial agent in the polymer and then melt-spinning it generally exhibit higher breaking strength than fibers produced by directly melt-spinning the antimicrobial agent and PP. Furthermore, the resulting fibers exhibit excellent antimicrobial and good antiviral activity. However, as shown in Comparative Example 2, insufficient amounts of the dispersant PEG 400 can lead to agglomeration and poor dispersion, which in turn affects the breaking strength of the resulting fibers.

[0096] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A fiber with bactericidal and antiviral functions, characterized in that: The invention comprises the following components: resin particles, a dispersed polymer, and a fungicide; the fungicide is bismuth trioxide, and the particle size of the bismuth trioxide is less than 14 microns and greater than 5 nanometers; the mass ratio of the fungicide to the dispersed polymer is 1:1-10; the mass ratio of the fungicide to the dispersed polymer and the resin particles is 10-50:60-200; the dispersed polymer is any one of polyethylene glycol PEG400, polyethylene glycol PEG2000, polyethylene glycol PEG4000, and polytetramethylene glycol PTMG; the resin particles are selected from polypropylene (PP); The fiber is prepared by a method comprising the following steps: S1: adding the bactericide to the solvent, then adding the dispersing polymer, dispersing evenly with ultrasonic waves, removing the solvent, and fully drying to obtain the bactericidal polymer with the bactericide evenly dispersed; S2: adding the bactericidal polymer obtained in step S1 to the resin particles in proportion, and preparing fibers by melt spinning; Alternatively, the bactericidal polymer obtained in step S1 is added to part of the resin particles in proportion, and the mixture is firstly blended to prepare an antibacterial masterbatch, which is then blended with the remaining resin particles to prepare fibers by melt spinning.

2. The fiber with bactericidal and antiviral functions according to claim 1, characterized in that: The temperature of the melt spinning in step S2 is 30 to 80° C. higher than the melting point of the resin particles, and the take-up rate in the melt spinning is 500 to 2000 m / min.

3. An application of the fiber with bactericidal and antiviral functions as claimed in claim 1 or 2, characterized in that: Applicable to woven or non-woven fabrics; The fiber, woven fabric and non-woven fabric have an inactivation rate of greater than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans, an antiviral activity rate of greater than 90% against human coronavirus HcoV-229E, and an antiviral activity rate of greater than 90% against influenza A virus H1N1; The fiber breaking strength reaches up to 4.6CN / dtex; After washing 50 times, the fiber had an inactivation rate of more than 95% against Escherichia coli, Staphylococcus aureus and Candida albicans.

4. An application of the fiber with bactericidal and antiviral functions as claimed in claim 1 or 2, characterized in that: It is used in masks, gas masks, medical protective clothing, medical pads, purifiers, home textiles, aircraft interiors, high-speed rail interiors, astronaut clothing or military combat clothing.

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