Collagen pull frame fabric, preparation method and application thereof

Abstract

The application belongs to the technical field of functional textile fabric, and specifically discloses a collagen pull-frame fabric, a preparation method thereof and application. The collagen pull-frame fabric according to the application comprises the following components in percentage by mass: collagen fiber 17-22%; silk short fiber 8-11%; modal fiber 55-72%; polyurethane elastic fiber 10-11%; and the total content of the collagen fiber and the silk short fiber is greater than or equal to 25%. The natural protein is functioned, and the structure optimization mode of high count and high density of the fabric is combined to obtain a durable and stable pull-frame fabric which is moisturizing and comfortable. In the preparation method, a low-temperature neutral biological antibacterial enzyme fixing system is used, so that the pull-frame fabric has high-efficiency antibacterial performance and long-acting antibacterial stability.

Description

Technical Field

[0001] This application relates to the technical field of functional textile fabrics, and in particular to a collagen stretch fabric, its preparation method, and its application. Background Technology

[0002] Knitted fabrics are made by using knitting needles to bend yarn into loops and interlock them. The basic structural unit of knitted fabric is the loop. Under the action of the knitting needles, the yarn forms a two-dimensional or three-dimensional spatial curve, namely the loop. These loops interlock in the longitudinal (warp) and transverse (weft) directions, forming a soft and elastic mesh structure. Thanks to its loop structure, knitted fabrics have good elasticity and comfort, stretching and contracting with body movement, providing a free and unrestricted wearing experience, especially suitable for underwear and sportswear; they also have good breathability and moisture absorption, with the gaps between the loops facilitating air circulation and moisture wicking; and excellent softness and drape, with a comfortable feel and conforming to the body's curves.

[0003] As market demand continues to rise, functional requirements are being placed on conventional knitted fabrics, such as high absorbency and high antibacterial properties. Existing knitted fabrics typically achieve their antibacterial effect using chemical antibacterial agents, such as adding appropriate amounts of silver ion-based inorganic antibacterial agents, quaternary ammonium salt-based organic antibacterial agents, or chitosan-based natural antibacterial agents to viscose or polyester fibers. However, during long-term wear and washing, these antibacterial components gradually weaken and become ineffective, causing knitted fabrics to fail to maintain suitable long-term antibacterial properties. Furthermore, these antibacterial components (especially inorganic antibacterial agents) are highly irritating to human skin, easily causing allergic reactions and other adverse reactions in some individuals. Additionally, these antibacterial components also present environmental concerns.

[0004] Regarding the aforementioned technologies, the applicant believes that it is crucial to develop a stretch knitted fabric that balances comfort and eco-friendliness, as well as possessing high antibacterial properties and long-lasting antibacterial effects. Summary of the Invention

[0005] In order to achieve both high antibacterial rate and long-lasting antibacterial ability in antibacterial fabrics, and to reduce the irritation of conventional antibacterial ingredients to human skin and the lack of environmental friendliness, this application provides a collagen stretch fabric, its preparation method, and its application.

[0006] Firstly, this application provides a collagen stretch fabric, which adopts the following technical solution: A collagen stretch fabric, comprising the following components by weight percentage: Collagen fibers: 17-22%; Silk staple fiber: 8-11%; Modal fiber 55-72%; Polyurethane elastic fiber 10-11%; Furthermore, the total content of the collagen fiber and the short silk fiber is ≥25%.

[0007] By employing the aforementioned technical solutions, collagen fibers and silk staple fibers are used as natural protein composite fibers. This not only provides excellent moisturizing and skin-friendly effects, along with the premium feel and luster of silk staple fibers, but also utilizes their dense surface structure and quick-drying properties to make it more difficult for sebum, dead skin cells, and other organic dirt to adhere to and penetrate the fibers, thus limiting the survival environment for microorganisms and synergistically enhancing their antibacterial effect. Modal fibers, as regenerated fibers, possess excellent breathability and moisture absorption and wicking properties, quickly absorbing sweat from the skin surface and conducting it to the outer layer of the knitted fabric to create a low-humidity environment, similarly limiting the survival environment for microorganisms. Polyurethane elastic fibers have high elasticity and resilience, which, combined with the high-count, high-density knitted structure of the fabric, prevents it from easily loosening and deforming due to stretching during daily wear. Furthermore, the aforementioned fiber materials have complementary effects: Modal fibers have lower wet strength, while silk staple fibers have higher strength. The blending of these two fibers effectively compensates for the vulnerability of modal fibers to damage in wet conditions, improving the overall durability and washability of the fabric. Furthermore, the good rigidity of silk staple fibers, combined with the elasticity of polyurethane elastic fibers, allows the fabric to maintain softness while possessing excellent wrinkle resistance and shape stability. Simultaneously, all of these fiber materials are highly environmentally friendly: modal raw materials, as regenerated cellulose fibers, come from sustainably managed forests; collagen can be derived from byproducts of the food industry; and silk is a natural protein fiber. This results in a high bio-based content and good biodegradability in the entire fabric formulation, aligning with modern green consumption trends. Controlling the total content of collagen fibers and silk staple fibers to ≥25% ensures significant improvement in the skin's physiological functions and hand feel of the woven fabric.

[0008] Preferably, the collagen stretch fabric is knitted from antibacterial yarn, wherein the antibacterial yarn is a compact Sirospun yarn with a twist rate of 60s / 1Ne and the twist coefficient of the antibacterial yarn is set to 360-420.

[0009] By adopting the above technical solution, on the one hand, the antibacterial yarn used to knit the antibacterial fabric is made of high-count single yarn (60 English count) combined with a compact Sirospun process. By controlling the twist within a specific range, very fine antibacterial single yarn can be obtained, resulting in a more delicate, lightweight, and smooth knitted fabric. The compact Sirospun process effectively twists the edge fibers into the yarn body when two slivers are twisted, reducing surface fuzz. Simultaneously, the compact spinning process ensures straight and concentrated fiber arrangement with almost no stretch triangles, resulting in uniform fiber stress, thus increasing yarn strength and making the fabric surface smoother.

[0010] On the other hand, controlling the twist coefficient of antibacterial yarn between 360 and 420 can suppress yarn evenness and breakage, thereby ensuring yarn strength and uniformity to meet the requirements of subsequent processing steps. If the twist coefficient is too low (<360), the yarn is relatively soft and has a fluffier feel, but its strength is weakened and it has slightly more hairiness; if the twist coefficient is too high (>420), the excessive twist will lead to a larger yarn shrinkage rate and a stiffer feel.

[0011] Preferably, the weight of the collagen stretch fabric is set to 180-200 g / m². 2 The width of the collagen stretch fabric is set to 160-175cm, and the weave structure of the collagen stretch fabric is set to plain stretch.

[0012] By adopting the above technical solution, the weight of collagen stretch fabric can be controlled at 180-200 g / m². 2 This allows for the production of medium-thickness fabrics, resulting in garments that balance texture (drape) and breathability. Controlling the width of the collagen stretch fabric to 160-175cm ensures that the effective width of the knitted fabric after dyeing and setting better suits garment cutting, significantly reducing selvage waste and offering high versatility. Furthermore, using a plain weave structure for the collagen stretch fabric provides good elasticity in both the longitudinal and transverse directions (combined with polyurethane elastic fibers), resulting in garments that fit snugly without restricting movement. The tight plain weave structure also reduces snagging, improves dimensional stability, and further enhances the durability of the finished garments.

[0013] Preferably, the draw ratio of the polyurethane elastic fiber is set to 2.5 to 3.2×, and the yarn feed tension of the polyurethane elastic fiber is set to 8 to 12 cN.

[0014] By adopting the above technical solution, controlling the draft ratio of polyurethane elastic fibers at 2.5–3.2× allows the manufactured fabric to achieve both good resilience and wearing comfort. If the draft ratio of polyurethane elastic fibers is too low (<2.5), the fibers are not fully stretched, their elastic potential is difficult to realize, resulting in insufficient resilience, a soft feel, and a lack of firmness in the fabric. If the draft ratio is too high (>3.2), the tension on the fibers is too great, leading to fatigue damage, increasing the risk of yarn breakage during production, and affecting production efficiency. Furthermore, the fabric's elasticity diminishes rapidly after repeated wear or washing, making it prone to loosening and deformation. Controlling the yarn feed tension of polyurethane elastic fibers at 8–12 cN ensures stable, uniform, and controllable delivery to the knitting needle position, with uniform feed tension resulting in uniform elasticity. If the yarn feed tension is too low (<8 cN), the delivery of the fibers is unstable, easily slipping, shaking, or forming knots in the yarn feed channel. It can also easily lead to uneven length of polyurethane elastic fibers fed into the loom, resulting in uneven fabric elasticity and defects on the surface of the knitted fabric. If the yarn tension of the polyurethane elastic fibers is too low (>12cN), it can cause yarn breakage or subsequent elasticity reduction during the production process. Furthermore, after blending, it can affect the normal looping of other fibers, which may lead to abnormal fabric tightness or defects.

[0015] Preferably, the collagen stretch fabric has an antibacterial rate of ≥90% after 30 washes, an air permeability of ≥220 mm / s, a dimensional stability of ≤±3%, a moisture regain rate of 11-13%, and a skin irritation level of 0.

[0016] By adopting the above technical solutions, the woven collagen stretch fabric achieves an antibacterial rate of ≥90% after 30 washes, demonstrating its durable and reliable antibacterial ability, classifying it as a wash-resistant antibacterial fabric. The fabric's breathability is ≥220 mm / s, ensuring rapid sweat evaporation and contributing to an antibacterial environment while preventing sweat buildup between skin and clothing. Its dimensional stability is ≤±3%, thanks to its high-count, high-density structure, maintaining its original shape after wearing and washing, preventing loosening, shrinkage, or deformation. The fabric's wet regain is 11-13%, indicating rapid shrinkage and moisture release when wet, resulting in accelerated drying after washing and a better wearing experience. Finally, the fabric has a skin irritation rating of 0, achieved through the use of natural protein composite fibers and bio-enzyme antibacterial technology, distinguishing it from traditional structures and chemical antibacterial ingredients that irritate human skin, thus better meeting market demands.

[0017] Secondly, this application provides a method for preparing a collagen stretch fabric, comprising the following steps: S1. Pretreatment: The antibacterial yarn is knitted using a high-density circular knitting machine to obtain a greige fabric; the greige fabric is instantaneously singed at 800-900℃, then desized and spun at 95-100℃ for 40-50 minutes; and then dried at 90-100℃ to obtain a preliminary knitted fabric. S2. Step-by-step dyeing: Perform the following steps sequentially on the pre-knitted fabric from step S1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 90-100℃ and the pH value at 6-7 for dyeing treatment, followed by water washing and soaping to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dyes are used to control the temperature at 80-90℃ and the pH value at 6.5-7.5 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. S3. Setting: The dyed knitted fabric in step S2 is set using a setting machine at a temperature of ≤120℃, a speed of 17~20m / min, and a holding time of 25~35s to obtain the initial knitted fabric product. S4. Antibacterial enzyme finishing: The initial knitted fabric from step S3 is immersed in an antibacterial impregnation solution at a controlled temperature of 35-45℃, a liquor ratio of 1:20-1:30, and a pH value of 6.0-6.5 for 20-25 minutes, and then dried and fixed at a temperature of 95-105℃ for 8-10 minutes to obtain collagen stretch fabric.

[0018] By adopting the above technical solution, a high-density circular knitting machine is first used to knit the yarns mixed with four types of fibers, forming a high-count, high-density plain weave fabric. The fabric is then subjected to a brief singeing treatment to remove surface fuzz and oils and sizing agents added during spinning, thereby improving fabric smoothness, wettability, and dyeing uniformity. Next, a mild refining agent is used for desizing and scouring, avoiding strong alkalis and prolonged high-temperature treatments to protect the fibers and remove sizing agents and impurities. Finally, drying is performed, all in preparation for subsequent dyeing.

[0019] Different dyes and processes are used to achieve high-quality, uniform color dyeing based on the chemical properties of different fibers. After dyeing, thorough washing and soaping are performed to ensure colorfastness and fixation (step-by-step dyeing here should be understood as two consecutive dyeing processes on the same fabric). Collagen fibers and short silk fibers have reduced inherent strength; without step-by-step dyeing after weaving, yarn breakage and pilling are likely to occur in subsequent processes, reducing the quality of the fabric. Polyurethane elastic fibers, however, do not require dyeing and are directly encased within other fibers. Furthermore, dyeing different fibers in the same or continuous bath results in a more uniform color effect. In practice, acid dyes are first added to selectively dye the silk fibers on the fabric, while collagen and modal fibers are barely dyed or easily washed away. Then, medium-temperature reactive dyes are added (to avoid damaging the fibers) primarily to dye the collagen and modal fibers in the fabric. Since the silk fibers have already undergone color fixation in the previous steps, and the reactive dyes have little effect on already fixed silk, the dyeing effect is minimal.

[0020] The fabric is then set using a setting machine to create a stable initial product. The setting temperature is controlled at ≤120℃ to prevent denaturation and yellowing of the collagen fibers. Next, a dip-and-bake method is employed, combined with a low-temperature neutral antibacterial enzyme fixation system. The enzyme activity temperature, pH environment, and liquor ratio are controlled, and a drying process is then combined to ensure the antibacterial impregnation solution and composite fibers are fully fixed by a cross-linking agent, thus performing antibacterial functionalization on the knitted stretch fabric. All of the above processing steps take into account both the heat sensitivity of collagen fibers and the heat resistance range of polyurethane elastic fibers. The antibacterial treatment also fully considers the enzyme activity range, making the processing flow more stable and controllable, and ensuring the quality of the produced knitted stretch fabric.

[0021] Preferably, the diameter of the high-density circular knitting machine in step S1 is set to 34 inches, and the number of needles is set to 36.

[0022] By adopting the above technical solution, a high-density circular knitting machine is selected, with a cylinder diameter of 34 inches and a needle count of 36. The higher needle count allows for a more tightly packed arrangement of needles, enabling high-density knitting of the yarn and resulting in smaller, tighter loops. Simultaneously, high-count fine yarn (60s) is used to ensure a stable fabric structure, fine texture, smooth surface, resistance to deformation, and uniform weight. Using coarse yarn would prevent knitting or lead to needle breakage.

[0023] Preferably, the antibacterial impregnation solution in step S4 comprises, by mass percentage, the following components: 0.07-0.1% egg white lysozyme, 0.03-0.06% transglutaminase, 0.05-0.1% chitinase, 0.1-4% chitosan nanofibers, 0.8-1.2% acrylic fixative, and the balance being deionized water.

[0024] By employing the above technical solution, egg white lysozyme and chitinase are used as the main bio-enzyme antibacterial components, while chitosan nanofibers serve as both enzyme carriers and antibacterial components. Transglutaminase acts as an activity promoter, acrylic fixatives act as cross-linking components for the weak cross-linking and fixation of the antibacterial impregnation component with the fibers, and deionized water serves as the dissolving substrate. Specifically, egg white lysozyme, as an effective antibacterial component against bacteria (Staphylococcus aureus, Bacillus subtilis, etc.), can effectively hydrolyze peptidoglycan in bacterial cell walls, leading to bacterial lysis and thus exerting an antibacterial effect. Chitinase catalyzes the hydrolysis of chitin, a key component of the cell walls of most fungi, thereby achieving an antibacterial effect against fungi. Furthermore, chitinase itself is a protein enzyme, thus possessing high biocompatibility. By combining egg white lysozyme and chitinase for synergistic effect, the antibacterial spectrum can be more comprehensive, significantly improving the antibacterial effectiveness of the antibacterial impregnation solution. The introduction of transglutaminase can act as a catalyst, and the immobilized complex enzyme component can also exert antibacterial effects, indirectly affecting the effective dosage and durability of other components. Furthermore, the complex enzyme component can be covalently grafted onto chitosan nanofibers to form a stable cross-linked structure.

[0025] Chitosan possesses excellent antibacterial activity, biocompatibility, and biodegradability. Its positively charged amino groups bind to the negatively charged surface of microbial cells, leading to microbial death. Furthermore, it serves as an effective carrier for immobilized enzymes. The synergistic effect of chitosan and the complex enzyme components results in high activity and strong antibacterial properties. Utilizing nanoscale chitosan fibers effectively increases the specific surface area, thereby increasing the loading rate of the immobilized enzyme. The use of acrylic adhesives allows for weak cross-linking between the enzyme components and chitosan fibers and the fabric fibers, forming a stable network. This weak cross-linking method also effectively chemically links the chitosan carrier material and the active groups on the enzyme molecule surface, forming covalent bonds to immobilize the enzyme, thus improving enzyme stability and reusability. Simultaneously, the use of transglutaminase and acrylic adhesives firmly anchors the complex enzyme to the fabric fibers, significantly reducing the risk of it detaching from the fabric. The aforementioned synergistic solidification also enhances the stability of the complex bioenzyme, thereby prolonging its biological activity. Compared to its free form, it is more tolerant of temperature and pH changes and more resistant to environmental changes. Deionized water is used to dissolve and carry all other components.

[0026] Preferably, the antibacterial impregnation solution in step S4 further comprises, by mass percentage, the following components: 0.7-1% pH buffer and 2-3% enzyme stabilizer, wherein the pH buffer is selected as phosphate buffer and the enzyme stabilizer is selected as one or more of glycerol, sorbitol and trehalose.

[0027] By adopting the above technical solution and selecting phosphate-buffered saline (PBS) as the pH buffer, the pH of the antibacterial impregnation solution can be kept stable throughout the preparation process, preventing enzyme inactivation due to pH fluctuations. Furthermore, selecting one or more of glycerol, sorbitol, and trehalose as the enzyme stabilizer can stabilize the enzyme's spatial structure during storage and processing, preventing denaturation and inactivation.

[0028] Preferably, the method for preparing the antibacterial impregnation solution in step S4 includes the following steps: s1. Predispersed chitosan nanofibers: Weigh 75-85% of deionized water, add chitosan nanofibers, and stir at 40-60 rpm for 10-15 min to prepare chitosan nanofiber preparative solution. s2, Addition of additives: Add pH buffer and enzyme stabilizer to the chitosan nanofiber preparation solution in step s1 in sequence, control the pH value within 6.0 to 6.5, stir and mix at 30 to 60 rpm for 15 to 25 min to obtain the impregnation base solution; s3, Addition of biological enzymes: Control the temperature of the impregnation base solution in step s2 within 35-45℃, add transglutaminase and stir to mix evenly, then add egg white lysozyme and chitinase in sequence and stir to mix evenly to obtain the impregnation antibacterial base solution. s4. Volume adjustment: After diluting the remaining deionized water with an acrylic fixative, add it dropwise to the impregnation antibacterial base solution in step s3, and stir and mix at 30-60 rpm for 10-15 minutes to obtain the antibacterial impregnation solution.

[0029] By employing the above technical solution, firstly, most of the deionized water and chitosan nanofibers are continuously stirred under mild conditions until completely dispersed, forming a homogeneous, slightly turbid colloidal solution to prevent agglomeration caused by direct addition of chitosan nanofibers. Next, relevant auxiliaries for stabilizing the biocomplex enzyme are added to this chitosan nanofiber preparation solution to pre-construct a liquid environment that maintains enzyme activity and provides buffering. Then, bioenzyme components are added sequentially, ensuring that each enzyme is completely dissolved and uniformly dispersed before adding the next. Finally, the remaining deionized water is used to dilute the acrylic fixative to obtain a mixed solution, which is then added dropwise to prevent the fixative from reacting violently with the bioenzyme or chitosan due to excessively high local concentrations. The entire preparation process strictly controls temperature and pH, and employs gentle stirring to ensure the bioenzyme is in its optimal activity state, resulting in a stable and homogeneous antibacterial impregnation solution.

[0030] Thirdly, this application provides the application of the above-mentioned collagen stretch fabric or the above-mentioned method for preparing collagen stretch fabric in intimate apparel such as T-shirts, underwear, suits, loungewear, and sportswear.

[0031] In summary, this application has the following beneficial effects: 1. This application utilizes collagen fiber and silk staple fiber as natural protein composite fibers, which not only provide excellent moisturizing and skin-friendly effects, as well as the high-end skin feel and luster of silk staple fiber, but also leverage their dense surface structure and quick-drying properties to make it more difficult for sebum, dead skin cells, and other organic dirt secreted by the human body to adhere to and penetrate into the fiber interior, thus limiting the survival environment of microorganisms and synergistically enhancing their antibacterial effect. Modal fiber, as a regenerated fiber, has excellent breathability and moisture absorption and wicking properties, quickly absorbing sweat from the skin surface and conducting it to the outer layer of the knitted stretch fabric to create a low-humidity environment, similarly limiting the survival environment of microorganisms. Polyurethane elastic fiber has high elasticity and resilience, which, combined with the high-count, high-density knitted structure of the fabric, prevents it from loosening and deforming due to stretching during daily wear. Furthermore, the above fiber materials have complementary effects; Modal fiber has lower wet strength, while silk staple fiber has higher strength. The blending of these two fibers effectively compensates for the vulnerability of modal fibers to damage in wet conditions, improving the overall durability and washability of the fabric. Furthermore, the good rigidity of silk staple fibers, combined with the elasticity of polyurethane elastic fibers, allows the fabric to maintain softness while possessing excellent wrinkle resistance and shape stability. Simultaneously, all of these fiber materials are highly environmentally friendly: modal raw materials, as regenerated cellulose fibers, come from sustainably managed forests; collagen can be derived from byproducts of the food industry; and silk is a natural protein fiber. This results in a high bio-based content and good biodegradability in the entire fabric formulation, aligning with modern green consumption trends. Controlling the total content of collagen fibers and silk staple fibers to ≥25wt% ensures significant improvement in the skin's physiological functions and hand feel of the woven fabric.

[0032] 2. This application first uses a high-density circular knitting machine to knit a blend of yarns containing four types of fibers, forming a high-count, high-density plain weave fabric. Then, the fabric undergoes a brief singeing treatment to remove surface fuzz and oils and sizing agents added during spinning, thereby improving fabric smoothness, wettability, and dyeing uniformity. Next, a mild refining agent is used for desizing and scouring, avoiding strong alkalis and prolonged high-temperature treatments to protect the fibers and remove sizing agents and impurities. Finally, drying is performed to prepare for subsequent dyeing.

[0033] Different dyes and processes are used to achieve high-quality, uniform color dyeing based on the chemical properties of different fibers. After dyeing, thorough washing and soaping are performed to ensure colorfastness and fixation (step-by-step dyeing here should be understood as two consecutive dyeing processes on the same fabric). Collagen fibers and short silk fibers have reduced inherent strength; without step-by-step dyeing after weaving, yarn breakage and pilling are likely to occur in subsequent processes, reducing the quality of the fabric. Polyurethane elastic fibers, however, do not require dyeing and are directly encased within other fibers. Furthermore, dyeing different fibers in the same or continuous bath results in a more uniform color effect. In practice, acid dyes are first added to selectively dye the silk fibers on the fabric, while collagen and modal fibers are barely dyed or easily washed away. Then, medium-temperature reactive dyes are added (to avoid damaging the fibers) primarily to dye the collagen and modal fibers in the fabric. Since the silk fibers have already undergone color fixation in the previous steps, and the reactive dyes have little effect on already fixed silk, the dyeing effect is minimal.

[0034] The fabric is then set using a setting machine to create a stable initial product. The setting temperature is controlled at ≤120℃ to prevent denaturation and yellowing of the collagen fibers. Next, a dip-and-bake method is employed, combined with a low-temperature neutral antibacterial enzyme fixation system. The enzyme activity temperature, pH environment, and liquor ratio are controlled, and a drying process is then combined to ensure the antibacterial impregnation solution and composite fibers are fully fixed by a cross-linking agent, thus performing antibacterial functionalization on the knitted stretch fabric. All of the above processing steps take into account both the heat sensitivity of collagen fibers and the heat resistance range of polyurethane elastic fibers. The antibacterial treatment also fully considers the enzyme activity range, making the processing flow more stable and controllable, and ensuring the quality of the produced knitted stretch fabric.

[0035] 3. This application utilizes egg white lysozyme and chitinase as the main bio-enzyme antibacterial components, while chitosan nanofibers serve as both enzyme carriers and antibacterial components. Transglutaminase acts as an active compatibilizer, acrylic fixatives act as cross-linking components for the weak cross-linking and fixation of the antibacterial impregnation component with the fibers, and deionized water serves as the dissolving substrate. Specifically, egg white lysozyme, as an effective antibacterial component against bacteria (Staphylococcus aureus, Bacillus subtilis, etc.), can effectively hydrolyze peptidoglycan in bacterial cell walls, leading to bacterial lysis and thus exerting an antibacterial effect. Chitinase catalyzes the hydrolysis of chitin, a key component of the cell walls of most fungi, thereby achieving an antibacterial effect against fungi. Furthermore, chitinase itself is a protein enzyme, thus possessing high biocompatibility. By combining egg white lysozyme and chitinase for synergistic effect, a more comprehensive antibacterial spectrum can be achieved, significantly improving the antibacterial effectiveness of the antibacterial impregnation solution. The introduction of transglutaminase can act as a catalyst, and the immobilized complex enzyme component can also exert antibacterial effects, indirectly affecting the effective dosage and durability of other components. Furthermore, the complex enzyme component can be covalently grafted onto chitosan nanofibers to form a stable cross-linked structure.

[0036] Chitosan possesses excellent antibacterial activity, biocompatibility, and biodegradability. Its positively charged amino groups bind to the negatively charged surface of microbial cells, leading to microbial death. Furthermore, it serves as an effective carrier for immobilized enzymes. The synergistic effect of chitosan and the complex enzyme components results in high activity and strong antibacterial properties. Utilizing nanoscale chitosan fibers effectively increases the specific surface area, thereby increasing the loading rate of the immobilized enzyme. The use of acrylic adhesives allows for weak cross-linking between the enzyme components and chitosan fibers and the fabric fibers, forming a stable network. This weak cross-linking method also effectively chemically links the chitosan carrier material and the active groups on the enzyme molecule surface, forming covalent bonds to immobilize the enzyme, thus improving enzyme stability and reusability. Simultaneously, the use of transglutaminase and acrylic adhesives firmly anchors the complex enzyme to the fabric fibers, significantly reducing the risk of it detaching from the fabric. The aforementioned synergistic solidification also enhances the stability of the complex bioenzyme, thereby prolonging its biological activity. Compared to its free form, it is more tolerant of temperature and pH changes and more resistant to environmental changes. Deionized water is used to dissolve and carry all other components. Detailed Implementation

[0037] To facilitate understanding of this application, it may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0038] 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 belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] In this application, terms such as "further," "even more," "particularly," "for example," "like," "example," and "exemplary" are used for descriptive purposes to indicate that different technical solutions preceding and following each other are related in terms of their coverage, but should not be construed as limiting the preceding technical solution or restricting the scope of protection of this application. In this application, unless otherwise specified, A (e.g., B) indicates that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0040] In this application, the technical features or solutions described in open-ended language include both closed-ended technical features or solutions consisting of the listed contents and open-ended technical features or solutions that include the listed contents.

[0041] In this application, the exemplary descriptions such as "in some implementations (or embodiments)" and "in one implementation (or embodiment)" may cover, but are not limited to, the following meanings: these solutions can be combined with other solutions in a suitable manner to form new technical solutions.

[0042] In this application, where the method flow involves multiple steps, unless otherwise explicitly stated herein, there is no strict order restriction on the execution of these steps; they can be executed in any order other than those described. Moreover, any step may include multiple sub-steps or multiple stages, which are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or simultaneously with other steps or parts of the sub-steps or stages of other steps.

[0043] The raw materials used in the examples and comparative examples are all commercially available.

[0044] This application aims to disclose a collagen stretch fabric, the main components and their contents of which include: Collagen fibers: 17-22%; Silk staple fiber: 8-11%; Modal fiber 55-72%; Polyurethane elastic fiber 10-11%; The total content of collagen fiber and silk staple fiber is ≥25% to ensure the skin physiological function and hand feel of the woven fabric. For the above four types of raw material fibers, collagen fiber can be extracted from cowhide, and has high protein content, is environmentally friendly, non-irritating to the skin, and has preliminary antibacterial, antifungal, and moisturizing properties; silk staple fiber can be selected as 6A grade mulberry silk staple fiber to obtain a high-end hand feel and natural luster, improving skin-friendliness and moisture absorption and release; modal fiber can be selected as fine denier modal fiber, which has soft, smooth, and moisture-wicking properties, and is stronger than ordinary modal fiber; polyurethane elastic fiber (30D) provides resilience and shape stability, and its tension difference can be controlled to ≤±5%. In addition to the above four main fibers, this application can also blend other fibers in suitable amounts into the fabric, such as cotton fiber to improve moisture absorption or diacetate fiber to impart luster and smoothness.

[0045] The above-mentioned fiber raw materials are blended into yarn to produce antibacterial yarn, which is then woven into antibacterial fabric using a 36-needle / 34-inch high-density circular knitting machine. This high-density circular knitting machine must have electronic yarn feeding, constant tension, and online defect monitoring; specifically, a German Mayersey 36G high-density single-sided circular knitting machine can be used. Before weaving, the antibacterial yarn is spun using a compact Siro-spun yarn controlled at 60s / 1Ne, with a twist coefficient controlled at 360–420 to obtain high-quality yarn with minimal hairiness, high strength, evenness, good abrasion resistance, and good luster. Simultaneously, the four types of fiber raw materials can be blended in stages according to a specific order, gradually adding collagen, silk, and modal fibers, and then incorporating polyurethane elastic fibers during weaving. During this process, an additional lubricant can be added to optimize the cohesion of the various fibers. For polyurethane elastic fibers, it is preferable to control the draft ratio at 2.5–3.2× and the yarn tension at 8–12 cN. Meanwhile, for the overall collagen stretch fabric, its weight is controlled at 180-200g / m2, and its width is controlled at 160-175cm. The fabric structure can be plain stretch or other structures such as rib stripes.

[0046] For finished collagen stretch fabrics, strict requirements are imposed on the following: antibacterial rate ≥90% after 30 washes, breathability ≥220mm / s, dimensional stability ≤±3% (shrinkage ≤3%; twist ≤3%), wet recovery rate 11~13%, pilling ≥4 level, and skin irritation 0 level.

[0047] Based on the composition, related process parameters, and performance parameters of the aforementioned collagen stretch fabric, this application also discloses a method for preparing a corresponding collagen stretch fabric, comprising the following steps: 1. Pretreatment: The above antibacterial yarn is knitted on a 36-needle / 34-inch high-density circular knitting machine to obtain a greige fabric; the greige fabric is instantaneously singed at 800-900℃, then desized and spun at 95-100℃ for 40-50 minutes; and then dried at 90-100℃ to obtain a preliminary knitted fabric. 2. Step-by-step dyeing: Perform the following steps sequentially on the preliminary knitted fabric from step 1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 90-100℃ and the pH value at 6-7 for dyeing treatment, followed by water washing and soaping to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dyes are used to control the temperature at 80-90℃ and the pH value at 6.5-7.5 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. 3. Setting: The dyed knitted fabric from step 2 is set using a setting machine at a temperature of ≤120℃, a speed of 17~20m / min, and a holding time of 25~35s to obtain the initial knitted fabric product. 4. Antibacterial enzyme finishing: The knitted fabric from step 3 is immersed in an antibacterial impregnation solution at a controlled temperature of 35-45℃, a liquor ratio of 1:20-1:30, and a pH value of 6.0-6.5 for 20-25 minutes, and then dried and fixed at a temperature of 95-105℃ for 8-10 minutes to obtain collagen stretch fabric.

[0048] 5. Test the collagen stretch fabric from step 4 for indicators such as weight, width, color fastness, elasticity, and antibacterial properties. After passing the test, package and store it in the warehouse.

[0049] It is important to note that step 2 employs a step-by-step dyeing process, requiring the following color fastness: washing ≥ grade 4; dry / wet rubbing ≥ grade 3-4; perspiration ≥ grade 4. Furthermore, all auxiliaries / dyes used in this preparation process must comply with OEKO-TEX®, ZDHC, and REACH requirements.

[0050] Regarding step 4, the bio-antibacterial enzyme finishing, in the above-mentioned method for preparing collagen stretch fabric, this application also discloses a specific formulation and preparation method for the antibacterial impregnation solution used in the process: On the one hand, the above-mentioned antibacterial impregnation solution, by mass percentage, comprises the following components: Egg white lysozyme 0.07–0.1%; Transglutaminase levels: 0.03–0.06%; Chitinase 0.05–0.1%; Chitosan nanofibers 0.1–4%; Acrylic fixative 0.8–1.2%; pH buffer 0.7–1%; Enzyme stabilizer 2-3%; The remaining amount is replenished to 100% with deionized water.

[0051] For each of the above components, the transglutaminase can be a microbial transglutaminase; the chitinase can be the strain CZW003 screened from marine microorganisms; the chitosan nanofibers can be prepared by conventional electrospinning, and chitosan with a degree of deacetylation ≥90% can be used to expose more amino groups to facilitate cross-linking; the acrylic fixative can be a glycidyl methacrylate (GMA) system with GMA as the active monomer and N,N'-methylenebisacrylamide (MBAA) as the cross-linking agent. The epoxy groups on the GMA molecule can covalently bind to the amino groups on the surface of the complex enzyme molecule under mild conditions to achieve firm fixation; the pH buffer is selected as phosphate buffer; and the enzyme stabilizer is selected as one or more of glycerol, sorbitol, and trehalose.

[0052] On the other hand, the preparation method of the above-mentioned antibacterial impregnation solution includes the following steps: Ⅰ. Predispersed chitosan nanofibers: Weigh 75-85% of deionized water, add chitosan nanofibers, and stir at 40-60 rpm for 10-15 min to prepare chitosan nanofiber preparative solution. II. Addition of additives: Add pH buffer and enzyme stabilizer to the chitosan nanofiber preparation solution in step I in sequence, control the pH value within 6.0 to 6.5, stir and mix at 30 to 60 rpm for 15 to 25 minutes to obtain the impregnation base solution; III. Addition of biological enzymes: Control the temperature of the impregnation base solution in step II within 35-45℃, add transglutaminase and stir until evenly mixed, then add egg white lysozyme and chitinase in sequence and stir until evenly mixed to obtain the impregnation antibacterial base solution. IV. Volume Adjustment: Dilute the remaining deionized water with an acrylic fixative, then add it dropwise to the impregnation antibacterial base solution in step III. Stir and mix at 30-60 rpm for 10-15 minutes to obtain the antibacterial impregnation solution.

[0053] Preparation Example Preparation Example 1: A method for preparing an antibacterial impregnation solution, comprising the following steps: (1) Predispersed chitosan nanofibers: Weigh 74.8g of deionized water, add 2.0g of chitosan nanofibers, stir and mix at 50rpm for 13min to obtain chitosan nanofiber preparative solution; (2) Addition of additives: Add 0.8g of phosphate buffer and 2.5g of glycerol to the chitosan nanofiber preparation solution in step (1) in sequence, control the pH value within 6.5, stir and mix at 50rpm for 20min to obtain the impregnation base solution; (3) Addition of biological enzymes: Control the temperature of the impregnation base solution in step (2) within 40℃, add 0.05g transglutaminase and stir to mix evenly, then add 0.09g egg white lysozyme and 0.08g chitinase in sequence and stir to mix evenly to obtain the impregnation antibacterial base solution; (4) Volume adjustment: Add 1.0g of GMA-type fixative to the remaining 18.7g of deionized water for dilution treatment, and then add it dropwise to the impregnation antibacterial base solution in step (3). Stir and mix at 50rpm for 13min to obtain the antibacterial impregnation solution.

[0054] Preparation Example 2: A method for preparing an antibacterial impregnation solution, comprising the following steps: (1) Predispersed chitosan nanofibers: Weigh 77g of deionized water, add 4.0g of chitosan nanofibers, stir and mix at 60rpm for 15min to obtain chitosan nanofiber preparative solution; (2) Addition of additives: Add 1.0g phosphate buffer and 3.0g sorbitol to the chitosan nanofiber preparation solution in step (1) in sequence, control the pH value within 6.5, stir and mix at 60rpm for 25min to obtain the impregnation base solution; (3) Addition of biological enzymes: Control the temperature of the impregnation base solution in step (2) within 45℃, add 0.06g transglutaminase and stir to mix evenly, then add 0.1g egg white lysozyme and 0.1g chitinase in sequence and stir to mix evenly to obtain the impregnation antibacterial base solution; (4) Volume adjustment: Add 1.2g of GMA-type fixative to the remaining 13.5g of deionized water for dilution treatment, and then add it dropwise to the impregnation antibacterial base solution in step (3). Stir and mix at 60rpm for 15min to obtain the antibacterial impregnation solution.

[0055] Preparation Example 3: A method for preparing an antibacterial impregnation solution, comprising the following steps: (1) Predispersed chitosan nanofibers: Weigh 71.9g of deionized water, add 0.5g of chitosan nanofibers, stir and mix at 40rpm for 10min to obtain chitosan nanofiber preparative solution; (2) Addition of additives: Add 0.7g phosphate buffer and 2.0g trehalose to the chitosan nanofiber preparation solution in step (1) in sequence, control the pH value within 6.0, stir and mix at 30rpm for 15min to obtain the impregnation base solution; (3) Addition of biological enzymes: Control the temperature of the impregnation base solution in step (2) within 35℃, add 0.03g transglutaminase and stir to mix evenly, then add 0.07g egg white lysozyme and 0.05g chitinase in sequence and stir to mix evenly to obtain the impregnation antibacterial base solution; (4) Volume adjustment: Add 0.8g of GMA-type fixative to the remaining 24g of deionized water for dilution treatment, and then add it dropwise to the impregnation antibacterial base solution in step (3). Stir and mix at 30rpm for 10min to obtain the antibacterial impregnation solution.

[0056] Preparation Example 4, a method for preparing an antibacterial impregnation solution, differs from Preparation Example 1 in that the chitosan nanofibers in step (1) are replaced with an equal amount of cellulose.

[0057] Preparation Example 5: A method for preparing an antibacterial impregnation solution, which differs from Preparation Example 1 in that the phosphate buffer in step (2) is replaced with an equal amount of deionized water.

[0058] Preparation Example 6: A method for preparing an antibacterial impregnation solution, which differs from Preparation Example 1 in that the glycerol in step (2) is replaced with an equal amount of deionized water.

[0059] Preparation Example 7, a method for preparing an antibacterial impregnation solution, differs from Preparation Example 1 in that the transglutaminase in step (3) is replaced with an equal amount of deionized water.

[0060] Preparation Example 8: A method for preparing an antibacterial impregnation solution, which differs from Preparation Example 1 in that the egg white lysozyme in step (3) is replaced with an equal amount of deionized water.

[0061] Preparation Example 9: A method for preparing an antibacterial impregnation solution, which differs from Preparation Example 1 in that the chitinase in step (3) is replaced with an equal amount of deionized water.

[0062] Preparation Example 10: A method for preparing an antibacterial impregnation solution, which differs from Preparation Example 1 in that the GMA-type fixative in step (4) is replaced with an equal amount of carbodiimide.

[0063] Preparation Example 11: A method for preparing an antibacterial impregnation solution. The difference from Preparation Example 1 is that the GMA-type fixative in step (4) is not diluted with deionized water, but is directly added to the impregnation antibacterial base solution.

[0064] Example Example 1: A collagen stretch fabric, the preparation method of which includes the following steps: 1. Pretreatment: The antibacterial yarn is knitted on a 36-gauge / 34-inch high-density circular knitting machine to obtain the greige fabric; the greige fabric is instantaneously singed at 850℃, then desized and spun at 98℃ for 45 minutes; and then dried at 95℃ to obtain the preliminary knitted fabric. 2. Step-by-step dyeing: Perform the following steps sequentially on the preliminary knitted fabric from step 1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 95℃ and the pH value at 6.5 for dyeing treatment, followed by water washing and soaping to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dye is used to control the temperature at 85℃ and the pH value at 7 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. 3. Setting: The dyed knitted fabric from step 2 is set at a temperature of 110℃, a speed of 18m / min, and a holding time of 30s using a setting machine to obtain the initial knitted fabric product. 4. Antibacterial enzyme finishing: The knitted fabric in step 3 is immersed in an antibacterial impregnation solution at a controlled temperature of 40℃, a liquor ratio of 1:25, and a pH value of 6.5 for 23 minutes, and then dried and fixed at a temperature of 100℃ for 9 minutes to obtain collagen stretch fabric.

[0065] The antibacterial yarn contains 19% collagen fiber, 9% 6A grade mulberry silk short fiber, 61% fine denier modal fiber and 11% polyurethane elastic fiber, and the twist coefficient of the antibacterial yarn is set to 390; the draw ratio of the polyurethane elastic fiber is set to 2.8×, and the yarn tension is set to 10cN; and the antibacterial impregnation solution in step 4 is derived from preparation example 1.

[0066] Example 2: A collagen stretch fabric, the preparation method of which includes the following steps: 1. Pretreatment: The antibacterial yarn is knitted on a 36-needle / 34-inch high-density circular knitting machine to obtain the greige fabric; the greige fabric is instantaneously singed at 900℃, then desized and spun at 100℃ for 50 minutes; and then dried at 100℃ to obtain the preliminary knitted fabric. 2. Step-by-step dyeing: Perform the following steps sequentially on the preliminary knitted fabric from step 1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 100℃ and the pH value at 7 for dyeing treatment, followed by water washing and soap washing to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dye is used to control the temperature at 90℃ and the pH value at 7.5 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. 3. Setting: The dyed knitted fabric from step 2 is set at a temperature of 120℃, a speed of 20m / min, and a holding time of 35s using a setting machine to obtain the initial knitted fabric product. 4. Antibacterial enzyme finishing: The knitted fabric from step 3 is immersed in an antibacterial impregnation solution at a controlled temperature of 45℃, a liquor ratio of 1:30, and a pH of 6.5 for 25 minutes, and then dried and fixed at 105℃ for 10 minutes to obtain collagen stretch fabric.

[0067] The antibacterial yarn contains 22% collagen fiber, 11% grade 6A mulberry silk short fiber, 56% fine denier modal fiber and 10% polyurethane elastic fiber, and the twist coefficient of the antibacterial yarn is set to 420; the draw ratio of the polyurethane elastic fiber is set to 3.2×, and the yarn tension is set to 12cN; and the antibacterial impregnation solution in step 4 is derived from preparation example 1.

[0068] Example 3: A collagen stretch fabric, the preparation method of which includes the following steps: 1. Pretreatment: The antibacterial yarn is knitted on a 36-gauge / 34-inch high-density circular knitting machine to obtain the greige fabric; the greige fabric is instantaneously singed at 800℃, then desized and spun at 95℃ for 40 minutes; and then dried at 90℃ to obtain the preliminary knitted fabric. 2. Step-by-step dyeing: Perform the following steps sequentially on the preliminary knitted fabric from step 1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 90℃ and the pH value at 6 for dyeing treatment, followed by water washing and soaping to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dye is used to control the temperature at 80℃ and the pH value at 6.5 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. 3. Setting: The dyed knitted fabric from step 2 is set at a temperature of 100℃, a speed of 17m / min, and a holding time of 25s using a setting machine to obtain the initial knitted fabric product. 4. Antibacterial finishing: The knitted fabric from step 3 is immersed in an antibacterial impregnation solution at a controlled temperature of 35℃, a liquor ratio of 1:20, and a pH of 6.0 for 20 minutes, and then dried and fixed at a temperature of 95℃ for 8 minutes to obtain collagen stretch fabric.

[0069] The antibacterial yarn contains 17% collagen fiber, 8% 6A grade mulberry silk short fiber, 65% fine denier modal fiber and 10% polyurethane elastic fiber, and the twist coefficient of the antibacterial yarn is set to 360; the draw ratio of the polyurethane elastic fiber is set to 2.5×, and the yarn tension is set to 8cN; and the antibacterial impregnation solution in step 4 is derived from preparation example 1.

[0070] Example 4, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution in step 4 is derived from preparation example 2.

[0071] Example 5, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution in step 4 is derived from preparation example 3.

[0072] Comparative Example Comparative Example 1, a collagen stretch fabric, differs from Example 1 in that the collagen fibers in the antibacterial yarn are replaced with an equal amount of cotton fibers.

[0073] Comparative Example 2, a collagen stretch fabric, differs from Example 1 in that the 6A grade silk short fibers in the antibacterial yarn are replaced with an equal amount of cotton fibers.

[0074] Comparative Example 3, a collagen stretch fabric, differs from Example 1 in that the antibacterial yarn contains 10% collagen fiber, 5% 6A grade mulberry silk staple fiber, 75% fine denier modal fiber, and 10% polyurethane elastic fiber. That is, the total content of collagen fiber and silk staple fiber is 15%.

[0075] Comparative Example 4, a collagen stretch fabric, differs from Example 1 in that the twist coefficient of the antibacterial yarn is 200.

[0076] Comparative Example 5, a collagen stretch fabric, differs from Example 1 in that the stretch ratio of the polyurethane elastic fibers in the antibacterial yarn is 1.2×.

[0077] Comparative Example 6, a collagen stretch fabric, differs from Example 1 in that the pre-tension of the polyurethane elastic fibers in the antibacterial yarn is 4 cN.

[0078] Comparative Example 7, a collagen stretch fabric, differs from Example 1 in that the yarn in step 1 of its preparation method is not knitted using a 36-needle / 34-inch high-density circular knitting machine, but rather using a conventional single-sided circular knitting machine.

[0079] Comparative Example 8, a collagen stretch fabric, differs from Example 1 in that the initial knitted fabric in step 4 of its preparation method is immersed at a controlled temperature of 65°C, a liquor ratio of 1:1, and a pH value of 4.5.

[0080] Comparative Example 9, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 4.

[0081] Comparative Example 10, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 5.

[0082] Comparative Example 11, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 6.

[0083] Comparative Example 12, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 7.

[0084] Comparative Example 13, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 8.

[0085] Comparative Example 14, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 9.

[0086] Comparative Example 15, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 10.

[0087] Comparative Example 16, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is derived from Preparation Example 11.

[0088] Comparative Example 17, a collagen stretch fabric, differs from Example 1 in that the antibacterial impregnation solution used in step 4 of its preparation method for the initial knitted fabric impregnation treatment is an equal volume solution prepared with quaternary ammonium salt chemical antibacterial agent.

[0089] Performance testing Collagen stretch fabrics were prepared according to the methods described in the embodiments and comparative examples, and the prepared collagen stretch fabrics were cut into several standard collagen stretch fabric samples with a size of 100cm × 100cm. Three standard collagen stretch fabric samples were taken from each embodiment or comparative example for antibacterial performance, antibacterial long-term effect, dimensional stability, and skin irritation tests. The test results were averaged and recorded in Table 1. The test methods are as follows: 1. Antibacterial performance test: In accordance with the GB / T 20944-2022 series of standards "Evaluation of antibacterial properties of textiles", the antibacterial effect of standard collagen stretch fabric samples against Staphylococcus aureus and Candida albicans was tested. The test results are shown in Table 1.

[0090] 2. Antibacterial long-lasting performance test: Referring to GB / T 8629-2017 "Home washing and drying procedures for testing textiles", the standard collagen stretch fabric sample was subjected to simulated washing. After completing the specified 30 washes, the antibacterial rate was tested again according to the above-mentioned GB / T 20944-2022 standard. The test results are shown in Table 1.

[0091] 3. Dimensional stability test: Referring to GB / T 8629-2017 "Home washing and drying procedures for testing textiles", the standard collagen stretch fabric sample was subjected to simulated washing to measure whether it shrank or deformed after washing, and its warp and weft dimensional change rate was calculated. The test results are shown in Table 1.

[0092] 4. Skin irritation test: Referring to FZ / T 01158 "Determination of itching sensation of textile fabrics by vibration audio analysis", and combined with the actual first wearing feedback of users, the skin irritation of standard collagen stretch fabric was comprehensively evaluated. The test results are shown in Table 1.

[0093] Table 1 Based on Examples 1-5 and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. Structural analysis shows that the collagen stretch fabrics prepared in Examples 1-5 all meet the requirements of an antibacterial rate ≥98%, an antibacterial rate ≥90% after 30 washes, dimensional stability ≤±3%, and a skin irritation level of 0. This demonstrates that the fiber composition and preparation method of the collagen stretch fabric, along with the composition and preparation method of the antibacterial impregnation solution used in the bio-antibacterial enzyme finishing process, are crucial.

[0094] Based on Example 1, Comparative Examples 1-4, and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. Analytical analysis reveals that for Comparative Examples 1-3, using cotton fibers instead of collagen fibers and short silk fibers, or failing to maintain a total content of both below 25%, fails to fully utilize the moisturizing and skin-friendly effects and synergistic antibacterial effects of the natural protein composite fibers within the fiber system. Furthermore, for Comparative Example 4, when the twist coefficient of the antibacterial yarn is too low, the yarn is relatively soft and has a more fluffy feel, but its strength is weakened, and it has slightly more hairiness, thus affecting dimensional stability.

[0095] Based on Examples 1, Comparative Examples 5-8, and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. The structural analysis reveals that for Comparative Examples 5 and 6, the inability to maintain the stretch ratio and yarn tension of the polyurethane elastic fibers within a suitable range significantly impacts the overall dimensional stability of the knitted stretch fabric, failing to provide excellent durability. For Comparative Example 7, the lack of more precise knitting equipment also negatively affects the overall performance of the finished fabric. For Comparative Example 8, strict control of process parameters such as temperature, pH, and liquor ratio is necessary during the antibacterial enzyme finishing process to maintain the composite enzyme within its optimal activity range for optimal antibacterial effect.

[0096] Combining Example 1, Comparative Examples 9-11, and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. Analyzing the structure reveals that, for Comparative Example 9, the use of chitosan nanofibers in the antibacterial impregnation solution not only provides a certain antibacterial effect but also serves as the optimal carrier for the composite bio-enzyme with a high loading rate, thereby enhancing the fabric's antibacterial rate and long-lasting antibacterial properties. For Comparative Examples 10 and 11, the pH buffer and enzyme stabilizer are crucial in providing a stable enzymatic environment for the composite bio-enzyme.

[0097] Combining Examples 1, Comparative Examples 12-14, and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. Structural analysis reveals that, in Comparative Example 12, transglutaminase also exerts antibacterial activity and indirectly affects the effective dosage and durability of other components. Furthermore, the complex enzyme components can be covalently grafted onto chitosan nanofibers to form a stable cross-linked structure, ensuring long-lasting antibacterial efficacy. In Comparative Examples 13 and 14, egg white lysozyme showed particularly significant antibacterial effects against bacteria, while chitinase showed particularly significant antibacterial effects against fungi.

[0098] Combining Examples 1, Comparative Examples 15-17, and Table 1, the collagen stretch fabric prepared in Example 1 exhibits the best overall performance. Structural analysis reveals that, in Comparative Examples 15 and 16, the acrylic fixative effectively creates a weak cross-linking effect between the aforementioned enzyme components and chitosan fibers and the fabric fibers, forming a stable network. Furthermore, the transglutaminase and acrylic fixative firmly anchor the complex enzyme to the fabric fibers, significantly reducing the risk of detachment and ensuring long-lasting antibacterial efficacy. However, directly adding the acrylic fixative causes cross-linking reactions between enzyme molecules, disrupting the protein's spatial structure and restricting the spatial movement of enzyme molecules, thus reducing their activity, thermal vibration, and conformational flexibility. Conventional chemical antibacterial agents, such as quaternary ammonium salts, are highly irritating to human skin and are not suitable for this approach.

[0099] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A collagen stretch fabric, characterized in that, By mass percentage, it includes the following components: Collagen fibers: 17-22%; Silk staple fiber: 8-11%; Modal fiber 55-72%; Polyurethane elastic fiber 10-11%; Furthermore, the total content of the collagen fiber and the short silk fiber is ≥25%.

2. The collagen stretch fabric according to claim 1, characterized in that, The collagen stretch fabric is knitted from antibacterial yarn, which is a compact Sirospun yarn with a twist rate of 60s / 1Ne and a twist coefficient of 360-420.

3. The collagen stretch fabric according to claim 2, characterized in that, The weight of the collagen stretch fabric is set to 180-200 g / m². 2 The width of the collagen stretch fabric is set to 160-175cm, and the weave structure of the collagen stretch fabric is set to plain stretch.

4. The collagen stretch fabric according to claim 1, characterized in that, The stretch ratio of the polyurethane elastic fiber is set to 2.5 to 3.2×, and the yarn feed tension of the polyurethane elastic fiber is set to 8 to 12 cN.

5. The collagen stretch fabric according to claim 1, characterized in that, The collagen stretch fabric has an antibacterial rate of ≥90% after 30 washes, breathability of ≥220 mm / s, dimensional stability of ≤±3%, wet recovery rate of 11~13%, and skin irritation level of 0.

6. A method for preparing a collagen stretch fabric as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Pretreatment: The antibacterial yarn is knitted using a high-density circular knitting machine to obtain a greige fabric; the greige fabric is instantaneously singed at 800-900℃, then desized and spun at 95-100℃ for 40-50 minutes; and then dried at 90-100℃ to obtain a preliminary knitted fabric. S2. Step-by-step dyeing: Perform the following steps sequentially on the pre-knitted fabric from step S1: (1) Dyeing of short silk fibers: Acid dyes are used to control the temperature at 90-100℃ and the pH value at 6-7 for dyeing treatment, followed by water washing and soaping to remove floating color; (2) Dyeing of collagen fiber and modal fiber: medium temperature reactive dyes are used to control the temperature at 80-90℃ and the pH value at 6.5-7.5 for dyeing treatment, followed by water washing and soap washing to obtain dyed knitted fabric. S3. Setting: The dyed knitted fabric in step S2 is set using a setting machine at a temperature of ≤120℃, a speed of 17~20m / min, and a holding time of 25~35s to obtain the initial knitted fabric product. S4. Antibacterial enzyme finishing: The initial knitted fabric from step S3 is immersed in an antibacterial impregnation solution at a controlled temperature of 35-45℃, a liquor ratio of 1:20-1:30, and a pH value of 6.0-6.5 for 20-25 minutes, and then dried and fixed at a temperature of 95-105℃ for 8-10 minutes to obtain collagen stretch fabric.

7. The method for preparing a collagen stretch fabric according to claim 6, characterized in that, In step S1, the diameter of the high-density circular knitting machine is set to 34 inches, and the number of needles is set to 36.

8. The method for preparing a collagen stretch fabric according to claim 6, characterized in that, The antibacterial impregnation solution in step S4 comprises, by mass percentage, the following components: 0.07–0.1% egg white lysozyme, 0.03–0.06% transglutaminase, 0.05–0.1% chitinase, 0.1–4% chitosan nanofibers, 0.8–1.2% acrylic fixative, 0.7–1% pH buffer, 2–3% enzyme stabilizer, and the balance being deionized water; Furthermore, the pH buffer is selected as phosphate buffer, and the enzyme stabilizer is selected as one or more of glycerol, sorbitol and trehalose.

9. The method for preparing a collagen stretch fabric according to claim 8, characterized in that, The method for preparing the antibacterial impregnation solution in step S4 includes the following steps: s1. Predispersed chitosan nanofibers: Weigh 75-85% of deionized water, add chitosan nanofibers, and stir at 40-60 rpm for 10-15 min to prepare chitosan nanofiber preparative solution. s2, Addition of additives: Add pH buffer and enzyme stabilizer to the chitosan nanofiber preparation solution in step s1 in sequence, control the pH value within 6.0 to 6.5, stir and mix at 30 to 60 rpm for 15 to 25 min to obtain the impregnation base solution; s3, Addition of biological enzymes: Control the temperature of the impregnation base solution in step s2 within 35-45℃, add transglutaminase and stir to mix evenly, then add egg white lysozyme and chitinase in sequence and stir to mix evenly to obtain the impregnation antibacterial base solution. s4. Volume adjustment: After diluting the remaining deionized water with an acrylic fixative, add it dropwise to the impregnation antibacterial base solution in step s3, and stir and mix at 30-60 rpm for 10-15 minutes to obtain the antibacterial impregnation solution.

10. The application of a collagen stretch fabric according to any one of claims 1 to 5 or a method for preparing a collagen stretch fabric according to any one of claims 6 to 9 in intimate apparel such as T-shirts, underwear, suits, loungewear, and sportswear.

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