High-elasticity antibacterial fiber material and preparation method thereof

Abstract

This invention provides a highly elastic antimicrobial fiber material and a preparation method thereof. The highly elastic antimicrobial fiber material comprises a first layer comprising aramid fiber and carbon fiber, and a second layer comprising guanidine / polyurethane fiber. The carbon fiber to aramid fiber ratio in the first layer is 1:1-3. By combining the first and second layers, the highly elastic antimicrobial fiber material not only exhibits an excellent elastic modulus but also possesses superior antimicrobial efficacy.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber material manufacturing, and in particular relates to a high-elasticity antibacterial fiber material and a preparation method thereof. Background Art

[0002] To meet the hygiene and health needs in various applications, including medical and health care, personal care, home environment, public health, industrial agriculture, etc., related technologies use the method of adding metal ions such as silver ions and copper ions to fibers to produce fibers with antibacterial effects.

[0003] Fiber materials with added antimicrobial agents can inhibit the growth of bacteria and other microorganisms, but there are disadvantages. On the one hand, the cost of adding metal ions is high. On the other hand, for synthetic fibers such as polyester and nylon, silver ions interact with polymer chain segments, changing the mechanical properties of the fibers, resulting in increased fiber brittleness and a decrease in the elastic modulus of the woven fiber materials, which cannot meet the needs of elastic fabrics such as bandages and sportswear. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a highly elastic antibacterial fiber material and a preparation method thereof, aiming to solve the problem of low elastic modulus of the antibacterial fiber material in a low-cost manner.

[0005] To solve the above technical problems, the present invention is implemented as follows: a highly elastic antibacterial fiber material, comprising a first layer and a second layer, wherein the first layer comprises the aramid fiber and the carbon fiber, and the second layer comprises guanidine salt / polyurethane fiber, wherein the carbon fiber and aramid fiber content ratio in the first layer is 1:1 to 3.

[0006] In some embodiments of the present invention, the guanidine salt / polyurethane fiber comprises a polyurethane dispersion and a guanidine salt, wherein the guanidine salt comprises at least one of polyhexamethyleneguanidine hydrochloride, polyhexamethyleneguanidine stearate, polyhexamethyleneguanidine propionate, and polyhexamethyleneguanidine phosphate.

[0007] In some embodiments of the present invention, the first layer includes a plurality of first warps and first wefts, the second layer includes a plurality of second warps and second wefts, and the first intersection points of the first wefts and first wefts are staggered with the second intersection points of the second warps and second wefts.

[0008] In some embodiments of the present invention, at least a third intersection point of each of the second longitude lines with a first latitude line is exposed on the outer surface of the first layer.

[0009] In some embodiments of the present invention, the fineness of the carbon fiber and the polyester fiber is 1-1.5D, and the fineness of the guanidine salt / polyurethane fiber is 0.5-1.5D.

[0010] The present invention provides a preparation method for preparing the high-elasticity antibacterial fiber material as described above, the preparation method comprising the following steps:

[0011] S1. preparing a polyurethane dispersion;

[0012] S2, simultaneously adding dropwise the guanidine salt solution and the polyurethane dispersion and mixing them, and spinning the mixed solution into the guanidine salt / polyurethane fiber;

[0013] S3. First, weave the guanidine salt / polyurethane fiber into a second layer, and then mix and weave the carbon fiber and the aramid fiber with the second layer to form a first layer, so as to prepare the high-elasticity antibacterial fiber material.

[0014] In some embodiments of the present invention, step S1 includes:

[0015] S1.1. Mixing a vegetable oil-based polyol, a crosslinking agent, and a hydrophilic chain extender, and heating the mixture for the first time to obtain a polyurethane prepolymer;

[0016] S1.2. Sequentially adding a catalyst and an organic solvent to the polyurethane prepolymer, stirring and mixing, heating for a second time, and then adding an alkaline neutralizer and continuing stirring to obtain a polyurethane emulsion, wherein the mass ratio of the catalyst: the alkaline neutralizer: the hydrophilic chain extender: the crosslinker: the vegetable oil-based polyol is 0.02-0.01:0.5-1:1:2-4:5-8;

[0017] S1.3. Heating the polyurethane emulsion for a third time to prepare the polyurethane dispersion.

[0018] In some embodiments of the present invention, the plant oil-based polyol includes at least one of castor oil-based polyol, soybean oil-based polyol, and palm oil-based polyol;

[0019] The cross-linking agent includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate;

[0020] The hydrophilic chain extender includes at least one of 2,2-dihydroxymethylbutyric acid, N-methyldiethanolamine, and trimethylolpropane;

[0021] The catalyst comprises at least one of stannous octoate, triethylenediamine, dibutyltin dilaurate, and zinc acetylmethyl isobutyl ketone;

[0022] The alkaline neutralizing agent includes at least one of trimethylamine, triethylamine, and triisopropylamine;

[0023] The organic solvent includes at least one of ethyl acetate, butanone, toluene, and methyl isobutyl ketone.

[0024] In some embodiments of the present invention, the heating temperature of the first heating is 70-80°C, the heating temperature of the second heating is 25-30°C, and the heating temperature of the third heating is 90-110°C.

[0025] Compared with the prior art, the high elasticity antibacterial fiber material and its preparation method of the present invention have the following advantages:

[0026] The combination of aramid and carbon fibers in the first layer provides the fiber material with high elasticity. The aramid fibers, due to their excellent toughness and strength, enable the fiber material to quickly return to its original shape when stretched or compressed. The carbon fibers, with their high modulus and low density, further enhance the fiber material's elasticity and resistance to deformation.

[0027] The polyurethane in the second layer serves as the matrix, while guanidine salts are introduced as antimicrobial agents and reinforcing agents. By leveraging electrostatic interactions and intermolecular hydrogen bonds between the components, the bonding between the matrix and reinforcing agent is enhanced, improving the mechanical properties of the guanidine salt / polyurethane fiber. The introduction of guanidine salts disrupts the polyurethane's original "oil-in-water" structure, increasing the hydrophilic portion within the fiber, enhancing the fiber's hygroscopicity and breathability. Combined with the antimicrobial properties of guanidine salts, this prevents bacterial reproduction and growth on the fiber surface. By combining the first and second layers, the highly elastic antimicrobial fiber material possesses not only an excellent elastic modulus but also exceptional antimicrobial effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a highly elastic antibacterial fiber material according to an embodiment of the present invention;

[0029] Figure 2 1 is a flow chart of a method for preparing a highly elastic antibacterial fiber material according to an embodiment of the present invention.

[0030] In the accompanying drawings, the reference numerals represent: 100, high-elastic antibacterial fiber material; 11, first layer; 111, first warp; 112, first weft; 113, first intersection; 12, second layer; 121, second warp; 122, second weft; 123, second intersection; 13, third intersection. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Please refer to Figure 1 The present invention provides a high-elasticity antibacterial fiber material 100, which includes a first layer 11 and a second layer 12. The first layer 11 includes aramid fiber and carbon fiber, and the second layer 12 includes guanidine salt / polyurethane fiber. The content ratio of carbon fiber to aramid fiber in the first layer 11 is 1:1~3.

[0033] The combination of aramid and carbon fibers in the first layer 11 provides the fiber material with high elasticity. The aramid fibers, due to their excellent toughness and strength, enable the fiber material to quickly recover from tension or compression. The carbon fibers, with their high modulus and low density, further enhance the fiber material's elasticity and resistance to deformation.

[0034] The polyurethane in the second layer 12 serves as a matrix, and the guanidine salt is introduced as an antimicrobial agent and reinforcing agent. By leveraging electrostatic interactions and intermolecular hydrogen bonds between the components, the bonding between the matrix and reinforcing agent is enhanced, improving the mechanical properties of the guanidine salt / polyurethane fiber. The introduction of the guanidine salt disrupts the polyurethane's original "oil-in-water" structure, increasing the hydrophilic portion within the fiber, enhancing the fiber material's hygroscopicity and breathability. Combined with the antimicrobial properties of the guanidine salt, it prevents bacterial reproduction and growth on the fiber surface. By combining the first layer 11 and the second layer 12, the highly elastic antimicrobial fiber material 100 possesses not only excellent mechanical properties but also superior antimicrobial efficacy.

[0035] Guanidine salt / polyurethane fiber comprises a polyurethane dispersion and a guanidine salt. The guanidine salt includes at least one of polyhexamethyleneguanidine hydrochloride, polyhexamethyleneguanidine stearate, polyhexamethyleneguanidine propionate, and polyhexamethyleneguanidine phosphate. Guanidine salts act by binding to bacterial cell walls, disrupting the cell membrane structure and causing leakage of cell contents, thereby killing the bacteria. Using different types of polyhexamethyleneguanidine salts, such as hydrochloride, stearate, propionate, and phosphate, can provide more effective antimicrobial effects against different microorganisms, enhancing the breadth and durability of the antimicrobial effect.

[0036] Moreover, the thermal conductivity along the cross-sectional direction of the carbon fibers is extremely low, and the heat that contacts the first layer 11 is difficult to transmit. The first layer 11 woven with carbon fibers has strong thermal insulation performance, and the high-elasticity antibacterial fiber material 100 can extend the thermal insulation effect.

[0037] Specifically, the first layer 11 includes a plurality of first warps 111 and first wefts 112, the second layer 12 includes a plurality of second warps 121 and second wefts 122, and the first intersection 113 of the first wefts 112 and the second intersection 123 of the second warps 121 and the second wefts 122 are staggered.

[0038] The staggered intersections of the warp and weft lines in the first and second layers 11 and 12 help disperse stress and strain. This allows the material to evenly bear the load when subjected to external forces, reducing stress concentration at single intersections and improving overall strength and toughness. This staggered intersection creates more micropores, enhancing the material's air permeability and moisture absorption, making it more suitable for applications requiring excellent breathability and comfort, such as sportswear and medical textiles.

[0039] Furthermore, the third intersection 13 of each second warp thread 121 with at least one first weft thread 112 is exposed on the outer surface of the first layer 11. By exposing the intersections of the second warp threads 121 and the first weft threads 112 on the outer surface, the double-layer connection structure creates a stronger connection point, enhancing the bond between the two layers of fabric and improving the overall strength and durability of the fabric. This also increases the interweaving density of the surface fibers, forming a more complex mesh structure. This allows the two layers of fabric to jointly withstand external forces during stretching and tearing, distributing stress and preventing stress concentration at a single point, significantly improving the fabric's tear and stretch resistance.

[0040] Moreover, the exposed second warp 121 contains antibacterial components, which can directly exert antibacterial effects when exposed on the outer surface, effectively inhibit the reproduction of bacteria on the surface of the material, improve the hygienic properties of the material, and are suitable for medical and health-related applications.

[0041] Specifically, the fineness of carbon fiber and polyester fiber is 1-1.5D, while the fineness of guanidine / polyurethane fiber is 0.5-1.5D. The smaller the fineness, the finer the fiber. Finer fibers provide a larger surface area, allowing the antimicrobial component of the guanidine salt to more effectively contact and inhibit microorganisms. It also tightly bonds with the antimicrobial layer, improving the performance of the overall fiber material.

[0042] In one embodiment, guanidine salt / polyurethane fibers, carbon fibers, and polyester fibers can be spunbonded, meltblown, hydroentangled, or air-laid to form a web. After the fibers are gathered into a web, they are made into a non-woven fiber material through mechanical, thermal, or chemical bonding methods, which can also effectively maintain the antibacterial properties of the fiber material.

[0043] Example 1:

[0044] Please refer to Figure 2In the first embodiment of the present invention, a preparation method is provided for preparing a high-elasticity antibacterial fiber material 100. The preparation method comprises the following steps:

[0045] S1. Prepare a polyurethane dispersion.

[0046] The specific steps of S1 are as follows:

[0047] S1.1. Mix 10 g of castor oil-based polyol, 8 g of isophorone diisocyanate, and 2 g of 2,2-dimethylolbutyric acid and heat for the first time to obtain a polyurethane prepolymer. The first heating temperature is 80°C, the mixing stirring rate is 200 rpm, and the heating stirring time is 10 min.

[0048] Castor oil-based polyols provide hydroxyl groups for the synthesis of polyurethanes, while isophorone diisocyanate provides isocyanate groups. The hydroxyl and isocyanate groups react to form urethane bonds in the polyurethane chain. 2,2-Dimethylolbutyric acid acts as a hydrophilic chain extender, introducing hydrophilic groups that impart water solubility or dispersibility to the polyurethane, facilitating mixing with guanidine salts in subsequent reactions.

[0049] As the basic chain segment, polyurethane prepolymers provide the essential mechanical and structural properties of polyurethane materials, such as high strength and elasticity. Prepolymers also possess a certain degree of hydrophilicity, allowing them to react with alkaline neutralizers in subsequent reactions, further improving the water solubility or dispersibility of the polyurethane, making them suitable for the preparation of waterborne polyurethane dispersions.

[0050] S1.2. Add dibutyltin dilaurate and butanone to the polyurethane prepolymer in sequence, stir and mix, heat for a second time, then add 1 g of triethylamine and continue stirring to obtain a polyurethane emulsion. The amount of dibutyltin dilaurate is 0.15 g, and the stirring time is 2 h. The second heating temperature is 25°C, and the stirring rate is 500 rpm.

[0051] Dibutyltin dilaurate acts as a reaction catalyst, coordinating with the isocyanate groups to reduce the activation energy of the reaction, accelerate the reaction between the isocyanate, polyol, and chain extender, increase the reaction rate and efficiency, and promote the formation of urethane bonds. Butanone dissolves the polyurethane prepolymer, reducing its viscosity and ensuring a uniform mixture, facilitating subsequent stirring and emulsification. Triethylamine acts as a neutralizing agent, neutralizing the carboxyl groups in the prepolymer to form salts. This increases the hydrophilicity and dispersibility of the polyurethane, making it easier to disperse in water to form a stable emulsion.

[0052] The addition of dibutyltin dilaurate and butanone to the polyurethane prepolymer is carried out at the heating temperature of the first heating. Dibutyltin dilaurate is added first to be fully mixed in the prepolymer to ensure that it can efficiently catalyze the reaction between isocyanate and hydroxyl. If butanone is added first, the concentration of the catalyst may be reduced, affecting the catalytic efficiency.

[0053] The second heating temperature is lower than the first heating temperature because triethylamine is easily volatile at higher temperatures. By cooling, the volatilization loss of triethylamine can be reduced, ensuring that a sufficient amount of triethylamine participates in the neutralization reaction, thereby improving the reaction efficiency and product quality. Cooling can also reduce or avoid the occurrence of these side reactions, ensuring that the main reaction proceeds smoothly.

[0054] After adding triethylamine, the stirring speed increases. High-speed stirring can generate stronger shear forces, helping to form finer polyurethane particles and improving the emulsification effect, making the final polyurethane emulsion more stable and with a more uniform particle distribution. High-speed stirring also helps maintain the uniformity of the system, preventing phase separation caused by density differences or uneven reactions, and ensuring consistent quality and performance of the final product.

[0055] S1.3. Heat the polyurethane emulsion for a third time to prepare a polyurethane dispersion. The third heating temperature is 90°C.

[0056] At higher temperatures, unreacted isocyanate and hydroxyl groups can continue to react, ensuring the complete reaction of the polyurethane and forming a more complete polymer network structure. During the heating process, the viscosity of the system decreases, which helps the polyurethane particles disperse more evenly in the water, forming a stable dispersion. Heating also helps evaporate the solvent, reducing the residual solvent content in the system and obtaining a purer polyurethane dispersion.

[0057] S2. The guanidine salt solution and the polyurethane dispersion are simultaneously added dropwise and mixed, and the mixed solution is blended into guanidine salt / polyurethane fibers. The guanidine salt solution is a 1 wt% polyhexamethylene guanidine hydrochloride solution, and the mass ratio of the guanidine salt solution to the polyurethane dispersion is 1:1.

[0058] Simultaneous addition of the guanidine salt solution and polyurethane dispersion ensures uniform dispersion during mixing, forming a uniform composite fiber structure and avoiding phase separation. Simultaneous addition controls the reaction rate, preventing rapid reactions or agglomeration caused by localized high concentrations, and contributes to a stable fiber forming process. Simultaneous addition allows for better adjustment of the composite material's composition ratio, optimizing the fiber's mechanical and functional properties, and enhancing its antimicrobial properties, flexibility, and durability.

[0059] Lower concentrations help form small, evenly distributed guanidine salt particles, ensuring a smooth fiber surface and uniform internal structure, improving the overall fiber quality. Low guanidine salt concentrations also prevent excessive hardening or brittleness in the fiber, maintaining good flexibility and ductility.

[0060] Guanidine / polyurethane fibers were prepared by electrospinning using the following steps:

[0061] The guanidine salt solution and polyurethane dispersion are mixed evenly, filtered, degassed, and loaded into a syringe. The syringe is connected to a high-voltage power supply, with the syringe needle acting as the nozzle. The appropriate voltage and flow rate are set. Turning on the power supply, the high-voltage field stretches the mixed solution into fine fibers. The fibers are continuously stretched and solidified in the electric field, ultimately being collected on a receiving plate. The specific spinning equipment and process chosen depends on the material properties and the final application requirements.

[0062] S3. First, weave the guanidine salt / polyurethane fiber into the second layer 12, and then mix the carbon fiber and aramid fiber with the second layer 12 to form the first layer 11, so as to prepare the high-elasticity antibacterial fiber material 100.

[0063] The high-elasticity antibacterial fiber material 100 is knitted using a composite knitting machine. The operation steps are as follows:

[0064] (1) Using a loom, weave the guanidine salt / polyurethane fibers into a fiber material to form the second layer 12. Select an appropriate weave (e.g., plain weave, twill weave, or satin weave) to achieve the desired fiber material properties and performance. In Example 1, the second layer 12 is woven into a plain weave. Plain weave fabric is formed by alternating warp and weft threads to form a simple interlaced structure. Each warp thread passes through each weft thread in sequence. Due to the high frequency of interlacing of each warp thread and weft thread, the plain weave fabric has a very compact structure and good stability and tear resistance.

[0065] (2) Prepare the carbon fiber and aramid fiber separately and ensure that they have a length and uniformity suitable for weaving. Use a composite weaving machine to mix and weave the carbon fiber, aramid fiber and the woven second layer 12 to form the first layer 11.

[0066] The weaving process ensures uniform distribution of all fibers, staggering the second intersection 123 of the second warp 121 and second weft 122 of the second layer 12 with the first intersection 113 of the first weft 112 and first weft 112 of the first layer 11. Furthermore, the third intersection 13 of each second warp 121 with at least one first weft 112 is ensured to be exposed on the outer surface of the first layer 11 to achieve the desired mechanical and functional properties.

[0067] Example 2:

[0068] Example 2 of the present invention provides a preparation method for preparing a highly elastic antibacterial fiber material 100. The preparation method comprises the following steps:

[0069] S1. Prepare a polyurethane dispersion.

[0070] The specific steps of S1 are as follows:

[0071] S1.1. Mix 5 g of soybean oil-based polyol, 4 g of toluene diisocyanate, and 1.4 g of N-methyldiethanolamine and heat for the first time to obtain a polyurethane prepolymer. The first heating temperature is 70°C, the mixing stirring rate is 250 rpm, and the heating stirring time is 10 minutes.

[0072] S1.2. Add stannous octoate and ethyl acetate sequentially to the polyurethane prepolymer, stir and mix, heat for a second time, then add 0.7 g of trimethylamine and continue stirring to obtain a polyurethane emulsion. The amount of stannous octoate is 0.1 g, and the stirring time is 2 h. The second heating temperature is 30°C and the stirring rate is 500 rpm.

[0073] S1.3. Heat the polyurethane emulsion for a third time to prepare a polyurethane dispersion. The third heating temperature is 80°C.

[0074] S2. The guanidine salt solution and the polyurethane dispersion are simultaneously added dropwise and mixed, and the mixed solution is blended into guanidine salt / polyurethane fibers. The guanidine salt solution is a 0.5 wt% polyhexamethylene guanidine stearate solution, and the mass ratio of the guanidine salt solution to the polyurethane dispersion is 2:1.

[0075] S3. First, guanidine salt / polyurethane fibers are woven into the second layer 12. Then, carbon fibers and aramid fibers are mixed and woven with the second layer 12 to form the first layer 11, thereby producing a highly elastic antimicrobial fiber material 100. In Example 2, the second layer 12 is woven into a satin weave. Satin fabrics have a natural waterproofing effect due to their smooth surface, allowing water droplets to roll off easily and resist penetration. Furthermore, the weave structure of satin fabrics creates continuous floating lines on the warp or weft surface, resulting in a smoother surface and improved skin-friendliness.

[0076] Example 3:

[0077] Example 3 of the present invention provides a preparation method for preparing a highly elastic antibacterial fiber material 100. The preparation method comprises the following steps:

[0078] S1. Prepare a polyurethane dispersion.

[0079] The specific steps of S1 are as follows:

[0080] S1.1. Mix 7.5 g of palm oil-based polyol, 6 g of diphenylmethane diisocyanate, and 1 g of trimethylolpropane and heat for the first time to obtain a polyurethane prepolymer. The first heating temperature is 75°C, the mixing stirring rate is 250 rpm, and the heating stirring time is 10 minutes.

[0081] S1.2. Add triethylenediamine and toluene sequentially to the polyurethane prepolymer, stir and mix, heat for a second time, then add 0.5 g of triisopropylamine and continue stirring to obtain a polyurethane emulsion. The amount of triethylenediamine is 0.1 g, and the stirring time is 2 h. The second heating temperature is 30°C, and the stirring rate is 500 rpm.

[0082] S1.3. Heat the polyurethane emulsion for a third time to prepare a polyurethane dispersion. The third heating temperature is 110°C.

[0083] S2. The guanidine salt solution and the polyurethane dispersion are simultaneously added dropwise and mixed, and the mixed solution is blended into guanidine salt / polyurethane fibers. The guanidine salt solution is a 1.5 wt% polyhexamethylene guanidine propionate solution, and the mass ratio of the guanidine salt solution to the polyurethane dispersion is 1:2.

[0084] S3, first weave the guanidine salt / polyurethane fiber into the second layer 12, then mix the carbon fiber and aramid fiber with the second layer 12 to form the first layer 11, so as to produce the highly elastic antibacterial fiber material 100. In Example 3, the second layer 12 is woven into a twill.

[0085] The twill weaving structure has good wrinkle resistance, and clothes and fabrics are not prone to permanent wrinkles during use. The surface of the twill fabric has a distinct diagonal texture, which is not only beautiful, but also has a certain three-dimensional sense visually, increasing the texture of the fabric.

[0086] Comparative Example 1: The difference from Example 1 is that the prepared high-elasticity antibacterial fiber material 100 is a single-layer structure.

[0087] Comparative Example 2: The difference from Example 1 is that the ratio of carbon fiber to aramid fiber in the high-elasticity antibacterial fiber material 100 is 3:1.

[0088] Comparative Example 3: The difference from Example 1 is that the second layer 12 of the highly elastic antibacterial fiber material 100 is polyurethane fiber.

[0089] Experiment 1: Tensile test.

[0090] Three rectangular specimens of different sizes were cut from each highly elastic antimicrobial fiber material 100 in Examples 1-3 and Comparative Examples 1-3. The initial length and width of each specimen were recorded. The specimens were secured to the fixture of a tensile testing machine, ensuring that the specimens were perpendicular to the fixture and not loose. The tensile testing machine parameters, including the stretching speed and termination conditions, were set. The machine was started and the stress (tension) versus strain (elongation) curve was recorded. Within the elastic range, the slope of the stress-strain curve, i.e., the elastic modulus, was calculated. The experimental data are shown in Table 1.

[0091] Table 1:

[0092]

[0093] The elastic modulus of Comparative Example 1 is significantly lower than that of Example 1, indicating that the single-layer structure affects the elastic modulus. The elastic modulus of Comparative Example 2 is lower than that of Example 1, indicating that although increasing the carbon fiber ratio (3:1) increases the strength, the elastic modulus is reduced.

[0094] Experiment 2: Antibacterial and anti-mite experiment.

[0095] Small pieces of uniform size (eg, circular pieces with a diameter of 1 cm) were cut from the high elastic antibacterial fiber material 100 of Example 1 and Comparative Example 3 for experiments.

[0096] (1) Antibacterial test:

[0097] Escherichia coli and Staphylococcus aureus were inoculated on LB agar medium and cultured for 24 hours until colonies formed. Fiber material samples were placed on the culture medium inoculated with bacteria, ensuring full contact between the fiber material sample and the bacteria. The culture dishes were then incubated in a 37°C incubator for 24 hours. The culture plates were removed, and the diameter of the inhibition zone (the area without bacterial growth) surrounding each fiber material sample was observed and recorded. Bacterial growth on the fiber material surface was further observed using a microscope, and bacterial density was recorded. The experimental data are shown in Table 2.

[0098] Table 2:

[0099]

[0100] Guanidine salt is a broad-spectrum antimicrobial agent that can destroy the cell membranes of bacteria and fungi, thereby inhibiting or killing these microorganisms. Therefore, the diameter of the inhibition zone of Example 1 with the addition of guanidine salt is much larger than that of Comparative Example 3 without the addition of guanidine salt.

[0101] (2) Anti-mite experiment:

[0102] House dust mites were cultured on mite culture medium, ensuring that the medium was suitable for mite growth (temperature 25°C, humidity 70%). The initial mite count and activity were recorded. Fiber material samples were placed in a Petri dish along with the cultured mites, ensuring that the fiber material samples were covered with mites. The culture was maintained at a constant temperature and humidity for 7 days. The fiber material samples were removed and the number and activity of mites on the fiber material surface were observed using a microscope. The mite count and mortality rate for each fiber material sample were recorded. The experimental data are shown in Table 3.

[0103] Table 3:

[0104]

[0105] Mites often thrive in environments rich in bacteria and fungi. The antimicrobial effects of guanidine salts can indirectly reduce these habitats. Through their broad-spectrum antimicrobial activity, guanidine salts have the potential to indirectly reduce the habitat of mites, thereby achieving a mite-repellent effect. Therefore, the mite mortality rate in Example 1, which contained guanidine salts, was significantly higher than that in Comparative Example 3.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly elastic antibacterial fiber material, characterized in that: The highly elastic antibacterial fiber material includes a first layer and a second layer, the first layer includes a plurality of first warps and a first weft, the second layer includes a plurality of second warps and a second weft, the first intersections of the first wefts and the first wefts are staggered with the second intersections of the second warps and the second wefts, and at least one third intersection of each second warp and one first weft is exposed on the outer surface of the first layer, the first layer includes aramid fibers and carbon fibers, the second layer includes guanidine salt / polyurethane fibers, the guanidine salt / polyurethane fibers include a polyurethane dispersion and a guanidine salt, the guanidine salt including at least one of polyhexamethyleneguanidine hydrochloride, polyhexamethyleneguanidine stearate, polyhexamethyleneguanidine propionate, and polyhexamethyleneguanidine phosphate, and the content ratio of the carbon fibers to the aramid fibers in the first layer is 1:1-3; The preparation method of the high-elasticity antibacterial fiber material comprises the following steps: S1. preparing a polyurethane dispersion; S2, simultaneously adding dropwise the guanidine salt solution and the polyurethane dispersion and mixing them, and spinning the mixed solution into the guanidine salt / polyurethane fiber; The guanidine salt solution and the polyurethane dispersion are mixed evenly, filtered and degassed, and then loaded into a syringe. The syringe is connected to a high-voltage power supply, and the syringe needle is used as a nozzle. The voltage and flow rate are set, and the power is turned on. The mixed solution of the guanidine salt solution and the polyurethane dispersion is stretched into fibers through a high-voltage field. The fibers are continuously stretched and solidified in the electric field and are finally collected on a receiving plate to obtain guanidine salt / polyurethane fibers. S3. First, weave the guanidine salt / polyurethane fiber into a second layer, and then mix and weave the carbon fiber and the aramid fiber with the second layer to form a first layer, so as to prepare the high-elasticity antibacterial fiber material.

2. The high elastic antibacterial fiber material according to claim 1, characterized in that: The fineness of the carbon fiber and the aramid fiber is 1-1.5D, and the fineness of the guanidine salt / polyurethane fiber is 0.5-1.5D.

3. The high elastic antibacterial fiber material according to claim 1, characterized in that: The step S1 comprises: S1.

1. Mixing a vegetable oil-based polyol, a crosslinking agent, and a hydrophilic chain extender, and heating the mixture for the first time to obtain a polyurethane prepolymer; S1.

2. Sequentially adding a catalyst and an organic solvent to the polyurethane prepolymer, stirring and mixing, heating for a second time, and then adding an alkaline neutralizer and continuing stirring to obtain a polyurethane emulsion, wherein the mass ratio of the catalyst: the alkaline neutralizer: the hydrophilic chain extender: the crosslinker: the vegetable oil-based polyol is 0.02-0.01:0.5-1:1:2-4:5-8; S1.

3. Heating the polyurethane emulsion for a third time to prepare the polyurethane dispersion.

4. The high elastic antibacterial fiber material according to claim 3, characterized in that: The vegetable oil-based polyol includes at least one of castor oil-based polyol, soybean oil-based polyol, and palm oil-based polyol; The cross-linking agent includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate; The hydrophilic chain extender includes at least one of 2,2-dihydroxymethylbutyric acid, N-methyldiethanolamine, and trimethylolpropane; The catalyst comprises at least one of stannous octoate, triethylenediamine, dibutyltin dilaurate, and zinc acetylmethyl isobutyl ketone; The alkaline neutralizing agent includes at least one of trimethylamine, triethylamine, and triisopropylamine; The organic solvent includes at least one of ethyl acetate, butanone, toluene, and methyl isobutyl ketone.

5. The high elasticity antibacterial fiber material according to claim 3, characterized in that: The heating temperature of the first heating is 70-80°C, the heating temperature of the second heating is 25-30°C, and the heating temperature of the third heating is 90-110°C.

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