A composite fiber containing nano-natural tea fiber and its preparation method and application

Abstract

The present invention belongs to the technical field of fiber materials, and relates to a composite fiber containing nano natural tea fibers, and a preparation method and application thereof. The raw materials for preparing the composite fiber include nano natural tea fibers and basic fiber pulp, and the nano natural tea fibers are mate nano fiber microemulsions. The present invention integrates nanotechnology into the preparation of natural tea fibers, and adopts a microemulsion method to simultaneously and evenly disperse a variety of effective ingredients in tea in the mate nano fiber microemulsion, so that the multifunctionality of the fabric can be effectively exerted; the microemulsion system has high uniformity and long-term stability, and during the spinning process, the nano tea fibers can be highly dispersed in the spinning solution without the need for additional surfactants, and the effect of the functional fabric finally obtained can be long-lasting. In addition, mate tea is rich in tea polyphenols and unique yerba mate alkaloids, which can further improve the comprehensive performance of the composite fiber.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber materials and relates to a composite fiber containing nano natural tea fibers and a preparation method and application thereof. Background Art

[0002] Natural tea fiber is a new type of functional textile material created by extracting the active ingredients from tea leaves through a specific process and evenly dispersing them into textile fibers. The development of tea fiber fabrics can be traced back to the growing demand for healthy, environmentally friendly, and functional textiles. With improving living standards, people are increasingly concerned about their health and quality of life. While traditional textiles offer excellent comfort and aesthetics, they lack health benefits such as antibacterial, deodorizing, and antioxidant properties. Tea fiber fabrics, due to their natural antibacterial, deodorizing, and antioxidant properties, have attracted widespread market attention. At the same time, environmental protection has become a global issue. Traditional textile production relies heavily on the use of chemical dyes and additives, causing significant environmental pollution. Tea fiber fabrics, which do not require chemical dyes during production and have a natural beige color, avoid environmental pollution and align with the concept of sustainable development.

[0003] Tea fiber fabrics, due to their unique functionality and environmentally friendly properties, have been widely used in various fields. In underwear and sportswear, tea fiber fabrics offer excellent antibacterial, deodorizing, and breathable properties, making them suitable for use in these areas, providing a comfortable wearing experience. In bedding and household goods, their antibacterial, anti-mite, and antioxidant properties make them suitable for use in bedding and household goods, improving sleep quality and overall quality of life. In medical and nursing care products, their antibacterial, deodorizing, moisturizing, and antioxidant properties make them suitable for use in medical and nursing care products such as bandages and dressings, providing enhanced care. Furthermore, continuous innovation in tea fiber fabric production technology has enabled the creation of tea fiber fabrics with diverse functionalities, such as antibacterial, deodorizing, moisturizing, and antioxidant properties. To regulate the production and market of tea fiber fabrics, relevant standardization organizations and certification bodies have developed a series of standards and certification systems to ensure product quality and safety. For example, international standards and certification systems such as ISO and OEKO-TEX provide strong support for the production and application of tea fiber fabrics.

[0004] Despite their impressive functionality and environmental friendliness, tea fiber fabrics still face challenges and challenges in practical applications. To ensure the long-term effectiveness of tea fiber fabrics, it is crucial to evenly disperse the active ingredients in tea leaves throughout the fibers, ensuring their stability and durability within the fabric. This is a key technical challenge. Summary of the Invention

[0005] The present invention aims to solve the above problems in the prior art and provides a composite fiber containing nano-natural tea fiber and a preparation method and application thereof.

[0006] One object of the present invention is achieved by the following technical solutions:

[0007] The invention discloses a composite fiber containing nano natural tea fiber. The raw materials for preparing the composite fiber include nano natural tea fiber and basic fiber pulp. The nano natural tea fiber is mate tea nano fiber microemulsion.

[0008] Preferably, the method for preparing the yerba mate nanofiber microemulsion comprises the following steps:

[0009] (1) extracting active ingredients from yerba mate tea leaves to obtain yerba mate nanofiber liquid;

[0010] (2) adding a surfactant and a co-surfactant to the oil phase and stirring to obtain a pre-emulsion, and then adding the yerba mate nanofiber liquid to the pre-emulsion and continuing to stir to uniformly disperse it to obtain a yerba mate nanofiber emulsion;

[0011] (3) The yerba mate nanofiber emulsion is added to the aqueous phase and homogenized under pressure, and then ultrasonicated and the pH is adjusted to obtain the yerba mate nanofiber microemulsion.

[0012] Preferably, in step (1), extracting the active ingredient from yerba mate leaves comprises the following steps: pre-crushing the yerba mate leaves to obtain a pre-crushed yerba mate powder; adding the pre-crushed yerba mate powder to an extractant for extraction to obtain a yerba mate fiber stock solution; and concentrating the yerba mate fiber stock solution by rotary evaporation, and ball-milling the concentrated yerba mate fiber stock solution using a nano ball mill to obtain a yerba mate nanofiber solution.

[0013] Preferably, the particle size of the pre-crushed yerba mate powder is 1 to 100 μm.

[0014] Preferably, the extractant comprises one or more of water, ethanol, methanol, isopropanol, n-butanol, and propanol.

[0015] Preferably, the ratio of the pre-crushed yerba mate leaf powder to the extractant is (1-100) g: (10-1000) ml.

[0016] Preferably, the extraction temperature is 60-100° C., and the extraction time is 1-20 h.

[0017] Preferably, the rotary evaporation concentrates the yerba mate fiber stock solution to 5-30 wt% of the initial mass.

[0018] Preferably, the ball milling temperature is 5 to 30° C., and the ball milling time is 3 to 10 hours.

[0019] Preferably, the yerba mate nanofiber liquid is a mixed liquid containing nano-sized yerba mate fibers, and the particle size of the nano-sized yerba mate fibers is 10 to 90 nm.

[0020] Preferably, in step (2), the surfactant includes one or more of a nonionic surfactant, an anionic surfactant, a cationic surfactant, and a double-chain ionic surfactant.

[0021] Further preferably, in the step (2), the surfactant includes one or more of polyoxyethylene sorbitan monostearate (Tween 80), sodium dodecyl sulfate (SDS), sodium dodecylbenzenesulfonate (SDBS), cetyltrimethylammonium bromide (CTAB), and sodium dioctyl sulfosuccinate (AOT).

[0022] Preferably, in step (2), the co-surfactant includes one or more of n-propanol, isobutanol, n-pentanol, isopentanol, 1-hexanol, 2-hexanol, 1-octanol, 2-octanol, fusel oil, and p-nonylphenol.

[0023] Preferably, in step (2), the oil phase comprises one or more of cyclohexane, n-hexane, paraffin oil, cyclopentane, isooctane, epoxidized soybean oil, epoxidized sunflower oil, dimethyl silicone oil, polydimethylsiloxane, and white mineral oil.

[0024] Preferably, in step (2), the mass ratio of the surfactant, the co-surfactant, the oil phase and the yerba mate nanofiber liquid extract is (10-20): (1-15): (10-30): (10-20).

[0025] Preferably, in step (3), the pressure is increased to 0.1-10 MPa, the homogenization speed is 1000-10000 rpm, and the time is 1-20 min.

[0026] Preferably, in step (3), the ultrasonication time is 30 to 60 minutes, and the pH is adjusted to 4.0 to 7.0. Within this pH range, the stability of the active ingredients in the tea fiber in the microemulsion can be significantly improved.

[0027] Preferably, the basic fiber pulp includes one or more of cotton fiber pulp, silk fiber pulp, bamboo fiber pulp, flax fiber pulp, and hemp fiber pulp.

[0028] The second object of the present invention is achieved through the following technical solutions:

[0029] A method for preparing composite fibers containing nano-natural tea fibers comprises the following steps: subjecting base fiber pulp to impregnation, pressing, crushing, xantholysis, dissolution, filtration and degassing processes to obtain a fiber viscose spinning solution; adding yerba mate nanofiber microemulsion by pre-spinning injection and mixing uniformly to obtain a composite fiber spinning solution; and then spinning and post-processing to obtain the composite fibers containing nano-natural tea fibers.

[0030] Preferably, the mass ratio of the yerba mate nanofiber microemulsion to the fiber viscose spinning solution is (1-5):(5-10).

[0031] Preferably, the squeezing pressure is 0.5-1.5 MPa, the crushed particle size is 1-5 mm, the amount of CS2 used in the yellowing process is 20-50 wt%, and the yellowing temperature is 20-40°C.

[0032] Preferably, the post-processing operation includes cleaning, drying and shaping.

[0033] The third object of the present invention is achieved through the following technical solutions:

[0034] A composite fiber fabric containing nano natural tea fibers is obtained by processing the composite fiber containing nano natural tea fibers.

[0035] The fourth object of the present invention is achieved through the following technical solutions:

[0036] The invention discloses an application of a composite fiber fabric containing nano natural tea fibers in the preparation of clothing and household items.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention provides a composite fiber containing nano natural tea fiber, which integrates nano technology into the preparation of natural tea fiber. These nano natural tea fibers can be evenly dispersed in the spinning solution to ensure the uniform distribution of the effective ingredients in the tea fiber. The small size and high surface area at the nano level make it more stable in the spinning solution and less likely to agglomerate, thereby improving the uniformity and consistency of the fiber. Among them, the small size makes it easier for the effective ingredients to penetrate the skin, improves their bioavailability, and thus enhances the antibacterial, deodorizing, and antioxidant effects of the fabric; the high surface area is conducive to the contact of the effective ingredients with the skin, improves their absorption rate, and enhances the skin-nourishing effect of the fabric. In addition, the addition of nano natural tea fibers can also improve the mechanical properties of the fiber, increase the strength and toughness of the fiber, make the fabric more durable, and improve the feel and comfort of the fabric.

[0039] 2. The present invention provides a composite fiber containing nano-natural tea fibers. Using a microemulsion method, multiple soluble or insoluble active ingredients from tea leaves can be uniformly dispersed simultaneously in a yerba mate nanofiber microemulsion, effectively unleashing the multifunctionality of the fabric. The microemulsion system exhibits high uniformity and long-term stability. During the spinning process of the composite fiber, the nano-tea fibers can be highly dispersed in the spinning solution without the addition of surfactants, ensuring the long-lasting performance of the resulting functional fabric. The preparation process of this yerba mate nanofiber microemulsion is simple, seamlessly integrated with the spinning process, improving production efficiency and making it suitable for large-scale industrial production to meet market demand.

[0040] 3. The present invention provides a composite fiber containing nano-natural tea fibers, wherein the nano-natural tea fibers are made of yerba mate nanofiber microemulsion. Yerba mate contains a rich variety of tea polyphenols, including catechins, flavonoids, etc. Yerba mate also contains theaflavins, saponin compounds and unique yerba mate. Applying yerba mate to fibers to make fabrics that can be worn next to the skin has obvious advantages in terms of health, environmental protection, and comfort. Specifically, the various ingredients in yerba mate can effectively inhibit bacterial growth and extend the service life of the fabric. Tea polyphenols can also adsorb and decompose odor molecules and reduce odors caused by sweat and bacterial metabolism. Secondly, tea polyphenols, theaflavins and yerba mate have good moisturizing properties, which can absorb and lock in moisture, keep the skin moist and soft, and reduce dryness and roughness. In addition, the antioxidant components in yerba mate can reduce the production of free radicals, protect the skin from oxidative damage, help delay skin aging, and keep the skin healthy and young.

[0041] 4. The present invention provides a composite fiber containing nano-natural tea fibers, which incorporates a yerba mate nanofiber microemulsion containing a unique component, yerba mate. Yerba mate is a natural alkaloid similar to caffeine, but with distinct physiological effects. The use of yerba mate in natural tea fibers can provide multiple benefits, particularly in terms of antibacterial, deodorizing, refreshing, and stress-relieving properties. On the one hand, it can synergize with tea polyphenols to further promote antibacterial effects. On the other hand, yerba mate can stimulate the central nervous system, enhancing alertness and attention. Wearing tea fiber fabrics containing yerba mate can provide a certain degree of refreshing effect, making people feel refreshed. Yerba mate has a refreshing effect, but compared to caffeine, its effect is milder, does not cause excessive excitement or anxiety, and can help relieve stress, providing a sense of ease and relaxation. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims appended hereto.

[0043] Example 1

[0044] The preparation method of the yerba mate nanofiber microemulsion of this embodiment comprises the following steps:

[0045] (1) 10 g of yerba mate leaves were pulverized in a fluidized bed airflow superfine grinder to obtain a yerba mate pre-pulverized powder with a particle size of 100 μm. The yerba mate pre-pulverized powder was added to 100 ml of ethanol and extracted at 80° C. for 5 h to obtain a yerba mate fiber stock solution. The yerba mate fiber stock solution was concentrated by rotary evaporation to 15% of the initial mass, and then the concentrated yerba mate fiber stock solution was ball-milled in a nano-ball mill to reduce the particle size of the nano-yerba mate fibers therein to 60 nm, thereby obtaining a yerba mate nanofiber solution.

[0046] (2) 15 g of polyoxyethylene sorbitan monostearate and 10 g of n-propanol were added to 20 g of cyclohexane and stirred to obtain a pre-emulsion, and then 20 g of yerba mate nanofiber liquid was added and stirred to uniformly disperse it to obtain a yerba mate nanofiber emulsion;

[0047] (3) The yerba mate nanofiber emulsion was added to water, homogenized at 0.1 MPa and 5000 rpm for 5 min, and then ultrasonically treated for 45 min and the pH was adjusted to 6.0 to obtain the yerba mate nanofiber microemulsion.

[0048] The preparation method of the composite fiber containing nano-natural tea fibers comprises the following steps: immersing 200 g of cotton fiber pulp in an 18 g / L NaOH solution at 35° C. for 2 hours; squeezing the pulp at 1 MPa to a water content of 50 wt%; crushing the pulp to an average particle size of 3 mm; adding 50 g of CS2 at 30° C. for xanthening for 1 hour; dissolving the xanthened product in a 10 wt% NaOH solution at 20° C. and ripening the solution for 3 hours; filtering and vacuum degassing the solution to obtain a fiber viscose spinning solution; then adding 30 g of yerba mate nanofiber microemulsion by injection before spinning and mixing the mixture uniformly to obtain a composite fiber spinning solution; and then spinning and post-processing the solution to obtain the composite fiber containing nano-natural tea fibers.

[0049] Example 2

[0050] The preparation method of the yerba mate nanofiber microemulsion of this embodiment comprises the following steps:

[0051] (1) 15 g of yerba mate leaves were pulverized using a fluidized bed airflow superfine grinder to obtain a yerba mate pre-pulverized powder with a particle size of 100 μm. The yerba mate pre-pulverized powder was added to 250 ml of water and extracted at 80° C. for 5 h to obtain a yerba mate fiber stock solution. The yerba mate fiber stock solution was concentrated by rotary evaporation to 15% of the initial mass, and then the concentrated yerba mate fiber stock solution was ball-milled using a nano ball mill to reduce the particle size of the nano-sized yerba mate fibers therein to 60 nm, thereby obtaining a yerba mate nanofiber solution.

[0052] (2) adding 18 g of sodium lauryl sulfate and 15 g of isobutanol to 30 g of paraffin oil and stirring to obtain a pre-emulsion, and then adding 20 g of yerba mate nanofiber liquid and continuing to stir to uniformly disperse it to obtain a yerba mate nanofiber emulsion;

[0053] (3) The yerba mate nanofiber emulsion was added to water and stirred for 30 min, homogenized at 1 MPa and 5000 rpm for 3 min, and then ultrasonically treated for 30 min and the pH was adjusted to 6.0 to obtain the yerba mate nanofiber microemulsion.

[0054] The preparation method of the composite fiber containing nano natural tea fiber in this embodiment is the same as that in Example 1.

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 1 is that yerba mate fiber stock solution is used instead of yerba mate nanofiber microemulsion in the composite fiber raw material, and the rest is the same as Example 1.

[0057] The preparation method of the yerba mate fiber extract comprises the following steps: pulverizing 10 g of yerba mate leaves using a fluidized bed airflow ultrafine grinder to obtain a yerba mate pre-pulverized powder with a particle size of 100 μm; adding the yerba mate pre-pulverized powder to 100 ml of ethanol; and extracting at 80° C. for 5 hours to obtain a yerba mate fiber stock solution.

[0058] Comparative Example 2

[0059] The difference between this comparative example and Example 1 is that green tea nanofiber microemulsion is used instead of yerba mate nanofiber microemulsion in the composite fiber raw material, and the rest is the same as Example 1.

[0060] The preparation method of the green tea nanofiber microemulsion comprises the following steps:

[0061] (1) 10 g of green tea leaves were pulverized using a fluidized bed airflow ultrafine grinder to obtain a green tea pre-pulverized powder with a particle size of 100 μm. The green tea pre-pulverized powder was added to 100 ml of ethanol and extracted at 80° C. for 5 h to obtain a green tea fiber stock solution. The green tea fiber stock solution was concentrated by rotary evaporation to 15% of the initial mass, and then the concentrated green tea fiber stock solution was ball-milled using a nano-ball mill to reduce the particle size of the nano-scale green tea fibers therein to 60 nm, thereby obtaining a green tea nanofiber solution.

[0062] (2) 15 g of polyoxyethylene sorbitan monostearate and 10 g of n-propanol were added to 20 g of cyclohexane and stirred to obtain a pre-emulsion, and then 20 g of green tea fiber extract was added and stirred to uniformly disperse it to obtain a green tea nanofiber emulsion;

[0063] (3) The green tea nanofiber emulsion was added to water, homogenized at 0.1 MPa and 5000 rpm for 5 min, and then ultrasonically treated for 45 min and the pH was adjusted to 6.0 to obtain a green tea nanofiber microemulsion.

[0064] Comparative Example 3

[0065] The difference between this comparative example and Example 1 is that no yerba mate nanofiber microemulsion is added to the raw materials, and conventional cotton fibers are used for subsequent testing.

[0066] The composite fibers of the above examples and comparative examples were subjected to carding, spinning and weaving processes to obtain composite fiber fabrics, and the obtained fabrics were subjected to relevant performance tests. The specific test standards are as follows:

[0067] Elongation at break is measured according to ISO 13934-1;

[0068] Deodorization performance: According to ISO 17299-1 standard, the sample is placed in a sealed container containing odorous gas for 24 hours, and the odorous gas concentration in the container is measured using a gas chromatograph;

[0069] The moisture retention and moisture absorption properties are measured according to ASTM D2258;

[0070] Air permeability is measured according to ISO 9237;

[0071] The sensory evaluation of fabrics is conducted by trained technicians on a scale of 1-5, where 1 is very rough and 5 is very comfortable;

[0072] The specific measurement results are shown in Table 1.

[0073] Table 1. Test results of relevant properties of the embodiments and comparative examples

[0074]

[0075] The obtained fabric was subjected to antibacterial performance testing, and the inhibition rates against Escherichia coli and Staphylococcus aureus were determined according to ISO 20743 standard;

[0076] The obtained fabric was tested for its antioxidant properties, and the free radical scavenging rate was measured spectrophotometrically based on the DPPH analysis method;

[0077] The specific test results are shown in Table 2.

[0078] Table 2 Antibacterial performance test results of Examples and Comparative Examples

[0079]

[0080] As shown in Table 1 and Table 2, it can be seen from the examples that the composite fiber containing nano natural tea fiber prepared using the technical solution of the present invention has excellent moisturizing and moisture absorption effect, air permeability, deodorizing effect, antibacterial effect and antioxidant effect when applied to fabrics. The introduction of nano tea fiber microemulsion can also enhance the mechanical properties of the fiber. Composite with base fiber can effectively increase the smoothness of the fabric, improve the skin-friendly effect of the fabric, and is suitable for preparing functional skin-friendly products. It is sufficient to prove that the composite fiber containing nano natural tea fiber of the present invention has broad application prospects as a functional textile material and is expected to become an important part of the future textile market.

[0081] The various aspects, embodiments, and features of the present invention should be considered in all respects as illustrative and not limiting, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.

[0082] In the preparation method of the present invention, the order of the steps is not limited to the order listed. Persons skilled in the art will appreciate that variations in the order of the steps are within the scope of the present invention without inventive effort. Furthermore, two or more steps or actions may be performed simultaneously.

[0083] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit its implementation. Persons skilled in the art may make various modifications, additions, or substitute similar methods for the described specific embodiments. It is not necessary and impossible to provide comprehensive examples of all implementations here. However, obvious variations or modifications arising from the essential spirit of the present invention remain within the scope of protection of the present invention, and interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A composite fiber containing nano natural tea fiber, characterized in that: The raw materials for preparing the composite fiber include nano natural tea fiber and basic fiber pulp, wherein the nano natural tea fiber is mate tea nano fiber microemulsion; The preparation method of the yerba mate nanofiber microemulsion comprises the following steps: (1) extracting active ingredients from yerba mate tea leaves to obtain yerba mate nanofiber liquid; (2) adding a surfactant and a co-surfactant to the oil phase and stirring to obtain a pre-emulsion, and then adding the yerba mate nanofiber liquid to the pre-emulsion and continuing to stir to uniformly disperse it to obtain a yerba mate nanofiber emulsion; (3) The yerba mate nanofiber emulsion is added to the aqueous phase and homogenized under pressure, and then ultrasonicated and the pH is adjusted to obtain the yerba mate nanofiber microemulsion.

2. The composite fiber containing nano natural tea fiber according to claim 1, characterized in that: In the step (1), extracting the active ingredient from the yerba mate tea leaves comprises the following steps: pre-crushing the yerba mate tea leaves to obtain a pre-crushed yerba mate tea powder; adding the pre-crushed yerba mate tea powder to an extractant for extraction to obtain a yerba mate tea fiber stock solution; concentrating the yerba mate tea fiber stock solution by rotary evaporation, and ball milling the concentrated yerba mate tea fiber stock solution using a nano ball mill to obtain a yerba mate tea nanofiber solution; The particle size of the yerba mate tea pre-crushed powder is 1 to 100 μm; The extractant includes one or more of water, ethanol, methanol, isopropanol, n-butanol, and propanol; The ratio of the yerba mate pre-crushed powder to the extractant is (1-100) g: (10-1000) ml; The extraction temperature is 60-100° C. and the extraction time is 1-20 hours; The rotary evaporation concentrates the yerba mate fiber stock solution to 5-30 wt% of the initial mass; The ball milling temperature is 5 to 30° C., and the ball milling time is 3 to 10 hours; The yerba mate nanofiber liquid is a mixed liquid containing nanometer-scale yerba mate fibers, and the particle size of the nanometer-scale yerba mate fibers is 10-90 nm.

3. The composite fiber containing nano natural tea fiber according to claim 1, characterized in that: In the step (2), the surfactant includes one or more of a nonionic surfactant, an anionic surfactant, a cationic surfactant, and a double-chain ionic surfactant; In the step (2), the cosurfactant includes one or more of n-propanol, isobutanol, n-pentanol, isopentanol, 1-hexanol, 2-hexanol, 1-octanol, 2-octanol, fusel oil, and p-nonylphenol; In the step (2), the oil phase comprises one or more of cyclohexane, n-hexane, paraffin oil, cyclopentane, isooctane, epoxy soybean oil, epoxy sunflower oil, polydimethylsiloxane, and white mineral oil; In the step (2), the mass ratio of the surfactant, the co-surfactant, the oil phase and the yerba mate fiber extract is (10-20): (1-15): (10-30): (10-20).

4. The composite fiber containing nano natural tea fiber according to claim 1, characterized in that: In the step (3), the pressure is increased to 0.1-10 MPa, the homogenization speed is 1000-10000 rpm, and the time is 1-20 min; In the step (3), the ultrasonic time is 30 to 60 minutes, and the pH is adjusted to 4.0 to 7.

0.

5. The composite fiber containing nano natural tea fiber according to claim 1, characterized in that: The basic fiber pulp includes one or more of cotton fiber pulp, bamboo fiber pulp, and hemp fiber pulp.

6. A method for preparing a composite fiber containing nano natural tea fiber according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: subjecting basic fiber pulp to a process of impregnation, pressing, crushing, xantholysis, dissolution, filtration and degassing to obtain a fiber viscose spinning solution; then adding yerba mate nanofiber microemulsion by pre-spinning injection and mixing uniformly to obtain a composite fiber spinning solution; and then spinning and post-processing to obtain a composite fiber containing nano natural tea fibers.

7. The preparation method according to claim 6, characterized in that The mass ratio of the yerba mate nanofiber microemulsion to the fiber viscose spinning solution is (1-5): (5-10).

8. The preparation method according to claim 6, characterized in that The squeezing pressure is 0.5-1.5 MPa, the crushed particle size is 1-5 mm, the amount of CS2 used in the yellowing process is 20-50 wt%, and the yellowing temperature is 20-40° C.

9. A composite fiber fabric containing nano natural tea fibers, characterized in that: The composite fiber is obtained by processing the composite fiber containing nano natural tea fiber as claimed in any one of claims 1 to 5.

10. Use of the composite fiber fabric containing nano natural tea fibers as claimed in claim 9 in the preparation of clothing and household items.

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