Antibacterial odor-free fiber, method for preparing the same, and use thereof

Abstract

This application provides an antibacterial and odor-neutralizing fiber, its preparation method, and its application, belonging to the field of functional fiber materials. The antibacterial and odor-neutralizing fiber includes a matrix fiber and organic matter catalytic decomposition particles. The matrix fiber includes a core layer and a sheath layer surrounding the surface of the core layer; the organic matter catalytic decomposition particles are partially embedded in the sheath layer and partially exposed on the surface of the matrix fiber. In this application, the antibacterial and odor-neutralizing fiber can maintain high catalytic activity while improving the loading stability and interfacial compatibility of the organic matter catalytic decomposition particles.

Description

Technical Field

[0001] This invention relates to the field of functional fiber materials technology, specifically to an antibacterial and deodorizing fiber, its preparation method, and its application. Background Technology

[0002] The conventional preparation of odor-neutralizing automotive textiles currently available mainly employs two techniques: finishing and melt blending spinning. Finishing involves loading functional particles such as titanium dioxide onto the surface of fibers or fabrics through methods like impregnation, spraying, or coating. While the finishing process is simple, the functional particles are mostly physically attached to the fibers, resulting in weak bonding. During use, they are easily detached or lost due to friction, leading to functional degradation or even failure. Melt blending spinning, on the other hand, involves blending functional particles with chips in a molten state before spinning. Blending spinning can embed the functional particles within the fibers, improving durability.

[0003] However, the interfacial compatibility between inorganic functional particles and the fiber-forming polymer matrix is ​​poor. The particles are prone to agglomeration and difficult to disperse. Furthermore, most of the functional particles are encased inside the fiber and cannot come into contact with pollutants, resulting in low interfacial purification efficiency. Summary of the Invention

[0004] In view of the technical problems existing in the background art, this application proposes an antibacterial and deodorizing fiber, its preparation method, and its application. This antibacterial and deodorizing fiber can improve the loading stability and interfacial compatibility of organic matter catalytic decomposition particles while maintaining high catalytic activity.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide an antibacterial and deodorizing fiber, comprising: The matrix fiber includes a core layer and a sheath surrounding the surface of the core layer; Organic matter catalytic decomposition particles are partially embedded in the cortex and partially exposed on the surface of the matrix fibers.

[0006] Furthermore, the number-average particle size of the organic matter catalytic decomposition particles is 50nm-150nm.

[0007] Furthermore, the mass fraction of organic matter catalytic decomposition particles in the matrix fiber is 0.5%-5%.

[0008] Furthermore, the matrix fibers include polymer matrix fibers.

[0009] Furthermore, the core layer comprises at least one of polyester, polyamide, and polyolefin; and / or, The skin layer includes at least one of polyester, polyamide, and polyolefin.

[0010] Furthermore, the organic matter catalytic decomposition particles include at least one of titanium dioxide, zinc oxide, and metal-organic framework materials.

[0011] Secondly, embodiments of this application also provide a method for preparing antibacterial and deodorizing fibers, comprising: It provides raw materials for the catalytic decomposition of organic matter, a first matrix raw material, and a second matrix raw material, wherein the viscosity of the first matrix raw material is less than the viscosity of the second matrix raw material; Surface modification of organic matter catalytic decomposition raw materials yields precursors; The precursor is blended with the first matrix raw material and then granulated to obtain the intermediate. The intermediate and the second matrix raw material are melt-co-extruded to encapsulate the intermediate on the outside of the second matrix raw material, and then nascent fibers are obtained by composite spinning. The nascent fibers are stretched and heat-set to obtain antibacterial and deodorizing fibers.

[0012] Furthermore, the surface of the organic matter catalytic decomposition feedstock is modified to obtain a precursor, including: The surface of the organic catalytic decomposition raw material was modified by a surface modifier to obtain a precursor.

[0013] Furthermore, the melting temperature is 200℃-300℃.

[0014] Thirdly, embodiments of this application also provide an application of antibacterial and deodorizing fibers, wherein the aforementioned antibacterial and deodorizing fibers are applied to seat fabrics, ceilings, carpets, or air conditioning filters.

[0015] The beneficial effects of this application are as follows: In the technical solution of this application, by embedding organic catalytic decomposition particles into the cortex to form a mechanical interlocking effect, the bonding force between the organic catalytic decomposition particles and the matrix fiber is enhanced, reducing the problem of shedding and loss due to friction during use. Furthermore, the active sites of the organic catalytic decomposition particles partially exposed on the fiber surface can directly contact pollutants, fully exerting their catalytic decomposition effect, thus solving the problem of low purification efficiency caused by the complete encapsulation of particles in traditional melt blending spinning.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0018] Figure 1 This is a SEM (scanning electron microscope) image of the antibacterial and deodorizing fiber of Example 1 of this application. Detailed Implementation

[0019] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] To achieve the above objectives, in a first aspect, embodiments of this application provide an antibacterial and deodorizing fiber, comprising: The matrix fiber includes a core layer and a sheath surrounding the surface of the core layer; Organic matter catalytic decomposition particles are partially embedded in the cortex and partially exposed on the surface of the matrix fibers.

[0028] In the technical solution of this application, by embedding organic catalytic decomposition particles into the cortex to form a mechanical interlocking effect, the bonding force between the organic catalytic decomposition particles and the matrix fiber is enhanced, reducing the problem of shedding and loss due to friction during use. Furthermore, the active sites of the organic catalytic decomposition particles partially exposed on the fiber surface can directly contact pollutants, fully exerting their catalytic decomposition effect, thus solving the problem of low purification efficiency caused by the complete encapsulation of particles in traditional melt blending spinning.

[0029] In some embodiments, the number-average particle size of the organic matter catalytic decomposition particles is 50 nm-150 nm.

[0030] In this embodiment, by controlling the number-average particle size of the organic catalytic decomposition particles within the range of 50nm-150nm, the organic catalytic decomposition particles can be embedded in the cortex for stable loading. Furthermore, the organic catalytic decomposition particles within this particle size range have a large specific surface area, providing sufficient catalytic active sites, allowing for appropriate exposure of the organic catalytic decomposition particles on the fiber surface, thus achieving a balance between catalytic decomposition efficiency and structural stability.

[0031] In some embodiments, the organic matter catalytic decomposition particles have a mass fraction of 0.5%-5% in the matrix fiber.

[0032] In this embodiment, by controlling the mass fraction of organic matter catalytic decomposition particles within the range of 0.5%-5%, efficient sterilization and deodorization functions can be achieved while ensuring the mechanical properties of the fiber.

[0033] In some embodiments, the matrix fiber comprises a polymer matrix fiber.

[0034] In this embodiment, by using polymer matrix fibers as a carrier, the advantages of the core-sheath composite structure can be fully utilized, allowing the sheath and core layers to assume different functional roles. The core layer provides the main mechanical support and basic physical properties of the fiber, while the sheath layer can effectively load and controllably release functional particles, thereby improving the overall strength of the fiber while providing excellent antibacterial and deodorizing functions.

[0035] In some embodiments, the core layer comprises at least one of polyester, polyamide, and polyolefin.

[0036] In this embodiment, polyester, with its good strength, modulus, and heat resistance, provides excellent mechanical support and dimensional stability for the fibers. Polyamide, with its excellent abrasion resistance and elastic recovery, enhances the durability and comfort of the fibers. Polyolefin, with its low density and excellent chemical resistance, helps reduce fiber weight and improve environmental adaptability. By using these materials alone or in combination, the properties of the core layer can be flexibly adjusted according to specific application requirements.

[0037] In some embodiments, the skin layer comprises at least one of polyester, polyamide, and polyolefin.

[0038] In this embodiment, polyester, with its good strength, modulus, and heat resistance, provides excellent mechanical support and dimensional stability for the fiber. Polyamide, with its excellent abrasion resistance and elastic recovery, enhances the fiber's durability and comfort. Polyolefin, with its low density and excellent chemical resistance, helps reduce fiber weight and improve environmental adaptability. By using these materials alone or in combination, the properties of the sheath can be flexibly adjusted according to specific application requirements.

[0039] Furthermore, it is worth mentioning that the core layer and the skin layer can be configured with the same or different materials. When the core layer and the skin layer use the same materials, the production process can be simplified and good interfacial bonding between the layers can be ensured. When different materials are used, an optimized combination of functions and performance can be achieved. For example, the core layer can use high-strength polyester to provide mechanical support, and the skin layer can use modified polyamide to obtain better surface activity.

[0040] In some embodiments, the organic catalytic decomposition particles include at least one of titanium dioxide, zinc oxide, and metal-organic framework materials.

[0041] In this embodiment, titanium dioxide generates photogenerated electrons and holes under ultraviolet or visible light excitation, effectively catalyzing the decomposition of organic pollutants. This process offers advantages such as good chemical stability, non-toxicity, and low cost. Zinc oxide, possessing semiconductor properties similar to titanium dioxide, exhibits excellent catalytic activity under specific wavelengths of light and also inhibits various bacteria. Metal-organic framework materials, with their high specific surface area, tunable pore structure, and abundant active sites, enable efficient adsorption and catalytic degradation of specific pollutants. By using these materials alone or in combination, the selection can be flexible based on the type of target pollutant and the application scenario, achieving synergistic antibacterial and deodorizing effects.

[0042] Specifically, metal-organic framework materials can be ZIF-8, UiO-66, MIL-101 and other series of materials. Among them, ZIF-8 has excellent chemical and thermal stability, UiO-66 has outstanding performance in visible light response, and MIL-101 has extremely high specific surface area and pore volume. They can be screened according to specific catalytic requirements.

[0043] The second invention, according to embodiments of this application, also provides a method for preparing antibacterial and deodorizing fibers, comprising: It provides raw materials for the catalytic decomposition of organic matter, a first matrix raw material, and a second matrix raw material, wherein the viscosity of the first matrix raw material is less than the viscosity of the second matrix raw material; Surface modification of organic matter catalytic decomposition raw materials yields precursors; The precursor is blended with the first matrix raw material and then granulated to obtain the intermediate. The intermediate and the second matrix raw material are melt-co-extruded to encapsulate the intermediate on the outside of the second matrix raw material, and then nascent fibers are obtained by composite spinning. The nascent fibers are stretched and heat-set to obtain antibacterial and deodorizing fibers.

[0044] In this embodiment, surface modification treatment can improve the surface properties of organic catalytic decomposition particles, enhance their interfacial compatibility with the polymer matrix, and reduce particle agglomeration during melt processing. Pre-blending and granulating the modified precursor with the first matrix raw material allows for uniform dispersion of functional particles to form a stable intermediate. It can be noted that the Balas effect often makes it difficult to control the uniformity of fiber cross-sections. In the technical solution of this application, the high-viscosity melt (second matrix raw material) has a higher extrusion expansion rate and smaller stretching deformation; the low-viscosity melt (intermediate) has a lower extrusion expansion rate and larger stretching deformation. This allows the high-viscosity melt to exert a squeezing and stretching effect on the low-viscosity melt during extrusion, thereby promoting the migration and exposure of organic catalytic decomposition particles in the low-viscosity melt to the surface, enhancing their contact efficiency with the external environment.

[0045] It can be explained that by having the second matrix raw material and the intermediate melt flow through different channels, the organic catalytic decomposition particles in the intermediate are enriched in the skin region, while the core layer is composed of the second matrix raw material, thus forming a distinct skin-core interface structure.

[0046] It can be explained that when the first and second matrix materials are the same substance, the difference lies in their viscosity, which can be controlled by molecular weight. This design of the same material with different viscosities is beneficial to the good compatibility between the core and sheath layers.

[0047] In some embodiments, the surface of the organic catalytic decomposition feedstock is modified to obtain a precursor, comprising: The surface of the organic catalytic decomposition raw material was modified by a surface modifier to obtain a precursor.

[0048] In this embodiment, by introducing functional groups or coating layers on the surface of organic catalytic decomposition particles using surface modifiers, the surface energy of the organic catalytic decomposition particles can be reduced, thereby improving the wettability and interfacial bonding strength between them and the polymer matrix.

[0049] Specifically, in one embodiment, the surfactant is stearic acid.

[0050] In this embodiment, a flexible near-monolayer is constructed on the surface of organic catalytic decomposition particles using stearic acid. This layer fuses with the fiber-forming polymer during the melting process and initiates weak chemical bonding during subsequent heat treatment, thereby achieving firm anchoring and long-term stability of the particles without blocking the catalytic active sites.

[0051] In some embodiments, the melting temperature is 200°C-300°C.

[0052] In this embodiment, by controlling the melt treatment temperature within the range of 200℃-300℃, the surface modifier can fully contact and react with the organic catalytic decomposition raw materials. In addition, it is worth mentioning that this temperature range is conducive to the formation of a uniform and dense modified layer on the particle surface by surface modifiers such as stearic acid, providing good interfacial compatibility for subsequent composite processing with the polymer matrix.

[0053] The third invention, embodiments of this application, also provide an application of antibacterial and deodorizing fibers, including the application of all the above-described embodiments of antibacterial and deodorizing fibers to seat fabrics, headliners, carpets, or air conditioning filters.

[0054] In this embodiment, by applying antibacterial and odor-neutralizing fibers to seat fabrics, the growth of organic pollutants such as sweat and sebum from passengers can be inhibited on the fabric surface, thus reducing odors and improving the comfort and hygiene of the vehicle interior. When applied to headliner materials, it can continuously degrade volatile organic compounds in the vehicle, improving air quality. When applied to carpets, it can maintain long-lasting antibacterial and odor-neutralizing properties while withstanding frequent foot traffic and wear, reducing mold growth and odor accumulation. When applied to air conditioning filters, the three-dimensional network structure of the fibers enables efficient filtration and interception of particulate matter in the air, while the exposed catalytic active sites on the surface can decompose the trapped organic pollutants in situ, preventing secondary pollution and extending the filter's lifespan.

[0055] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0056] I. Preparation Method Example 1 The surface of titanium dioxide was modified with stearic acid to obtain a precursor; wherein the number average particle size of titanium dioxide was 100 nm. Low-viscosity polyethylene terephthalate and high-viscosity polyethylene terephthalate were treated with hot air at 155°C for 60 minutes to convert them into stable crystalline forms.

[0057] The pretreated low-viscosity polyethylene terephthalate was dried at 170°C for 5 hours to obtain dried low-viscosity polyethylene terephthalate with a water content of 30 ppm.

[0058] The pretreated high-viscosity polyethylene terephthalate was dried at 170°C for 7 hours to obtain dried high-viscosity polyethylene terephthalate with a water content of 30 ppm.

[0059] The precursor was blended with dried low-viscosity polyethylene terephthalate and then granulated to obtain the intermediate. The intermediate and dried high-viscosity polyethylene terephthalate (PET) are melted separately in two independent screw extruders. The core layer is the dried PET, with a screw temperature of 290°C; the sheath layer is the intermediate, with a temperature of 280°C. The melt is filtered and precisely metered by a metering pump before entering the core-sheath composite spinning assembly. The melt extruded from the spinneret is cooled by side-blowing or ring-blowing air at a temperature of 23°C and a velocity of 0.5 m / s. The cooled and solidified nascent fibers are bundled and oiled, and then wound into POY bobbins at a speed of 3000 m / min.

[0060] The nascent fibers obtained above were subjected to two stages of stretching: the first stage was at 85°C, and the second stage was at 150°C, with the total stretching ratio controlled at 3.7 times. The stretched fibers were then set at 140°C for 13 minutes to eliminate internal stress, resulting in the antibacterial and deodorizing fibers of Example 1.

[0061] Example 2 The difference from Example 1 is that titanium dioxide is replaced with zinc oxide. The remaining steps are roughly the same and will not be described in detail here, thus obtaining the antibacterial and deodorizing fiber of Example 2.

[0062] Example 3 The difference from Example 1 is that titanium dioxide is replaced with a metal-organic framework material (ZIF-8). The remaining steps are roughly the same and will not be described in detail here, resulting in the antibacterial and deodorizing fiber of Example 3.

[0063] Example 4 The difference from Example 1 is that the number-average particle size of titanium dioxide is 50 nm. The other steps are roughly the same and will not be described in detail here. The antibacterial and deodorizing fiber of Example 4 is obtained.

[0064] Example 5 The difference from Example 1 is that the number-average particle size of titanium dioxide is 150 nm. The other steps are roughly the same and will not be described in detail here. The antibacterial and deodorizing fiber of Example 5 is obtained.

[0065] Comparative Example 1 The difference from Example 1 is that the intermediate and the second matrix raw material are melt-co-extruded (that is, the intermediate and the second matrix raw material are melt-mixed evenly), and the nascent fiber is obtained by composite spinning; the remaining steps are roughly the same and will not be described in detail here, thus obtaining the antibacterial and deodorizing fiber of Comparative Example 1.

[0066] Comparative Example 2 The difference from Example 1 is that titanium dioxide is not added. The remaining steps are largely the same and will not be described in detail here, resulting in the antibacterial and deodorizing fiber of Comparative Example 2.

[0067] II. Testing Methods 1. Photodynamic antibacterial performance test method Utilizing the reactive oxygen species (such as ·OH, O2) generated by catalytic particles supported on the fiber surface under light irradiation - (etc.) Disrupts bacterial cell membranes and nucleic acid structures. The antibacterial rate is calculated by measuring the number of viable bacteria in the bacterial solution before and after light exposure, characterizing the photodynamic antibacterial effect of the fiber. Common car pathogens, *Escherichia coli* and *Staphylococcus aureus*, are selected as model bacteria. Antibacterial and odor-neutralizing textiles are cut into 1cm × 1cm samples, sterilized, and placed in sterile petri dishes for later use. 0.1 mL of a 1×10⁻⁶ concentration... 6 -1×10 7 CFU / mL bacterial suspension was evenly added dropwise to the surface of the sample. A blank, non-antibacterial, odor-neutralizing fiber was used as a control sample, and the same bacterial suspension was added. Both the sample and control samples were then subjected to light treatment under the conditions described above. Visible light irradiation was performed for 2 hours. After irradiation, 10 mL of sterile physiological saline was added to both the sample and control samples, and the mixture was eluted for 10 minutes. The eluent was serially diluted, and 0.1 mL of each diluted solution was spread onto solid culture plates. The plates were incubated in a constant temperature incubator for 16-24 hours. The antibacterial rate was calculated based on the viable bacterial concentration. Antibacterial rate calculation: Antibacterial rate (%) = [(Viable bacteria count in control sample - Viable bacteria count in sample) / Viable bacteria count in control sample] × 100%. Three parallel samples were prepared for each group of samples, and the average value was taken.

[0068] 2. Formaldehyde Oxidation Decomposition Performance Test Method A static sealed chamber method was employed, in which textiles were placed in a sealed chamber containing a fixed amount of formaldehyde. Catalytic particles were used to oxidize and decompose the formaldehyde under constant temperature and humidity conditions (temperature 25±2℃, relative humidity 60±5% RH). The formaldehyde concentration in the sealed chamber was measured at different time points, with the initial formaldehyde concentration set at 1.0 mg / m³. The formaldehyde decomposition rate was calculated to characterize the fiber's ability to oxidize and decompose formaldehyde. Accurately weighed textile samples were placed on a sample rack inside the sealed chamber and exposed to visible light. With circulating air, the formaldehyde concentration C was measured using a formaldehyde analyzer at 0h (initial concentration), 0.5h, 1h, 2h, and 4h. t Under the same conditions, without placing a sample, the concentration C of formaldehyde naturally decaying in the sealed chamber was measured. 空白 This excludes the influence of adsorption by the cabin. The decomposition rate calculation formula is: Formaldehyde decomposition rate (%) = [(C0-C...] t +C 空白 ) / (C0)]×100%.

[0069] (1) Two parallel samples were made for each group of samples, and the average value was taken. If the formaldehyde decomposition rate was ≥80% in 24h and ≥50% in 4h, it was judged as having excellent formaldehyde oxidation decomposition performance.

[0070] 3. SEM (Scanning Electron Microscopy) Testing Methods The microstructure of the fibers was characterized using scanning electron microscopy to observe the distribution and surface exposure of organic matter catalytic decomposition particles in the cortex.

[0071] III. Analysis of Test Results for Each Embodiment and Comparative Example Table 1. Antibacterial activity of Examples 1-5 and Comparative Examples 1-2 Table 2 Antibacterial activity of Examples 1-5 and Comparative Examples 1-2 Table 1 shows that Examples 1-5 exhibited excellent broad-spectrum antibacterial properties against Staphylococcus aureus, Escherichia coli, and Candida albicans. This indicates that the titanium dioxide catalytic particles enriched in the cortex generate a large number of reactive oxygen species under visible light irradiation, which disrupt the bacterial cell membrane structure and inhibit their metabolic activity. Comparative Example 1, because it did not employ a viscosity-difference-driven particle migration mechanism, had a more dispersed distribution of catalytic particles across the fiber cross-section, resulting in a lower density of active sites exposed in the cortex. Consequently, the antibacterial rates against the three bacteria decreased to 96%, 93%, and 82%, respectively, which are significantly lower than those of Examples 1-5. Comparative Example 2, having not added any catalytic functional particles, served as a control group.

[0072] As can be seen from the formaldehyde decomposition performance data in Table 2, Examples 1-5 exhibited good dynamic degradation capabilities at 0.5 hours, 1 hour, 2 hours, and 4 hours. This is because the titanium dioxide particles enriched in the cortex provided a high density of surface active sites, enabling formaldehyde molecules to be rapidly adsorbed and catalytically oxidized into carbon dioxide and water. In Comparative Example 1, due to the uniform distribution of catalytic particles across the fiber cross-section and insufficient concentration of active sites in the cortex region, the formaldehyde decomposition rate at each time point was significantly lower than that of Example 1, with a decomposition rate of only 47% at 4 hours, failing to meet the criteria for excellent performance. Comparative Example 2, lacking catalytic functional components, had an extremely low formaldehyde decomposition rate of only 6% at 4 hours, mainly relying on the physical adsorption of the fiber itself, with almost no catalytic degradation ability.

[0073] Visit Figure 1 , Figure 1The scanning electron microscope (SEM) images from Example 1 show a large number of uniformly distributed protruding particles on the fiber surface. This indicates that after surface modification and viscosity difference-driven composite spinning, the catalytic particles were successfully enriched in the fiber cortex and partially exposed on the surface. These exposed active sites provide a sufficient reaction interface for photocatalytic reactions and formaldehyde oxidation and decomposition, while maintaining the continuity of the fiber surface without obvious cracks or peeling, indicating a good interfacial bond between the particles and the polymer matrix.

[0074] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. An antibacterial and deodorizing fiber, characterized in that, include: The matrix fiber includes a core layer and a sheath surrounding the surface of the core layer; Organic matter catalytic decomposition particles are partially embedded in the skin layer and partially exposed on the surface of the matrix fiber.

2. The antibacterial and deodorizing fiber according to claim 1, characterized in that, The number-average particle size of the organic matter catalytic decomposition particles is 50nm-150nm.

3. The antibacterial and deodorizing fiber according to claim 1, characterized in that, The organic catalytic decomposition particles have a mass fraction of 0.5%-5% in the matrix fiber.

4. The antibacterial and deodorizing fiber according to claim 1, characterized in that, The matrix fibers include polymer matrix fibers.

5. The antibacterial and deodorizing fiber according to claim 4, characterized in that, The core layer comprises at least one of polyester, polyamide, and polyolefin; and / or, The skin layer comprises at least one of polyester, polyamide, and polyolefin.

6. The antibacterial and deodorizing fiber according to claim 1, characterized in that, The organic catalytic decomposition particles include at least one of titanium dioxide, zinc oxide, and metal-organic framework materials.

7. A method for preparing an antibacterial and deodorizing fiber, characterized in that, include: The system provides raw materials for the catalytic decomposition of organic matter, a first matrix material, and a second matrix material, wherein the viscosity of the first matrix material is less than the viscosity of the second matrix material. The surface of the organic catalytic decomposition raw material is modified to obtain a precursor; The precursor is blended with the first matrix raw material and then granulated to obtain an intermediate. The intermediate is melt-co-extruded with the second matrix raw material, so that the intermediate is wrapped around the outside of the second matrix raw material, and then nascent fibers are obtained by composite spinning; The nascent fibers are stretched and heat-set to obtain antibacterial and deodorizing fibers.

8. The method for preparing antibacterial and deodorizing fiber according to claim 7, characterized in that, The surface modification of the organic catalytic decomposition raw material to obtain the precursor includes: The surface of the organic catalytic decomposition raw material is modified with a surface modifier to obtain a precursor.

9. The method for preparing antibacterial and deodorizing fiber according to claim 7, characterized in that, The melting temperature is 200℃-300℃.

10. An application of an antibacterial and deodorizing fiber, characterized in that, The antibacterial and odor-neutralizing fiber according to any one of claims 1-6 is applied to seat fabrics, ceilings, carpets, or air conditioning filters.

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