Composite fiber containing nano natural tea fiber as well as preparation method and application of composite fiber

Abstract

The invention belongs to the technical field of fiber materials, and relates to a composite fiber containing nano natural tea fiber and a preparation method and application thereof. The preparation raw materials of the composite fiber comprise nano natural tea fiber and basic fiber pulp, and the nano natural tea fiber is a yerba mate nano fiber microemulsion. According to the invention, a nanotechnology is fused into the preparation of natural tea fibers, and a micro-emulsion method is adopted to uniformly disperse a plurality of effective components in tea leaves into a mate tea nanofiber micro-emulsion at the same time, so that the multifunctionality of the fabric is effectively developed; the microemulsion system has high uniformity and long-term stability, the nano tea fibers can be highly dispersed in the spinning solution without additionally adding a surfactant in the spinning process, and the effect of the finally obtained functional fabric is enduring. In addition, the yerba mate contains rich tea polyphenols and unique yerba mate alkali, so that the comprehensive performance of the composite fiber can be further improved.

Description

Technical Field

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

[0002] Natural tea fiber is a new type of functional textile material prepared by extracting the effective ingredients in tea through a specific process and evenly dispersing them into textile fibers. The development background of tea fiber fabrics can be traced back to people's growing demand for healthy, environmentally friendly and functional textiles. With the improvement of living standards, people are paying more and more attention to health and quality of life. Although traditional textiles perform well in terms of comfort and aesthetics, they are insufficient in health functions such as antibacterial, deodorizing and antioxidant. Tea fiber fabrics have received widespread attention in the market due to their natural antibacterial, deodorizing and antioxidant properties. At the same time, environmental protection has become a global issue. In the traditional textile production process, a large amount of chemical dyes and auxiliaries are used, which causes serious pollution to the environment. Tea fiber fabrics do not require the use of chemical dyes in the preparation process, and are naturally beige brown, avoiding pollution to the environment, and are in line with the concept of sustainable development.

[0003] Tea fiber fabrics have been widely used in many fields due to their unique functionality and environmental protection characteristics. In the field of underwear and sportswear, tea fiber fabrics have good antibacterial, anti-odor and moisture absorption and breathability properties, which are suitable for making underwear and sportswear, providing a comfortable wearing experience. In the field of bedding and household goods, the antibacterial, anti-mite and antioxidant properties of tea fiber fabrics make them suitable for making bedding and household goods, improving sleep quality and quality of life. In the field of medical and nursing supplies, the antibacterial, anti-odor, moisturizing and antioxidant properties of tea fiber fabrics make them suitable for making medical and nursing supplies, such as bandages, dressings, etc., providing better nursing effects. In addition, the preparation technology of tea fiber fabrics is constantly innovating, and tea fiber fabrics with multiple functions such as antibacterial, anti-odor, moisturizing, and antioxidant can be prepared. In order to standardize the production and market of tea fiber fabrics, relevant standardization organizations and certification bodies have formulated 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] Although tea fiber fabrics have excellent performance in terms of functionality and environmental protection, they still face some challenges and problems in practical applications. In order to ensure the long-term effectiveness of the functionality of tea fiber fabrics, it is necessary to evenly disperse the active ingredients in tea into the fibers to ensure their stability and durability in the fabric, which is a key technical problem. Summary of the invention

[0005] The present invention aims at solving 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] 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 effective ingredients from yerba mate 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 make it uniformly dispersed to obtain a yerba mate nanofiber emulsion;

[0011] (3) Adding the yerba mate nanofiber emulsion into the aqueous phase and homogenizing under pressure, and then performing ultrasound and adjusting the pH to obtain the yerba mate nanofiber microemulsion.

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

[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 hours.

[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 nanometer-scale yerba mate fibers, and the particle size of the nanometer-scale 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 dodecylbenzene sulfonate (SDBS), hexadecyltrimethylammonium bromide (CTAB), and dioctyl sodium 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, epoxy soybean oil, epoxy 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 ultrasonic 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 effective 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 by the following technical solutions:

[0029] A method for preparing composite fibers containing nano-natural tea fibers, the method comprising the following steps: subjecting base fiber pulp to impregnation, pressing, crushing, yellowing, dissolving, filtering and degassing processes to obtain fiber viscose spinning solution; then adding yerba mate nano-fiber microemulsion by pre-spinning injection and mixing evenly to obtain composite fiber spinning stock solution; then spinning and post-processing to obtain 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 pressing 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 by 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 by 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 of ​​the nanometer 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, improve their bioavailability, and thus enhance 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 care effect of the fabric. In addition, the addition of nano natural tea fiber can also improve the mechanical properties of the fiber, improve the strength and toughness of the fiber, make the fabric more durable, and improve the feel and comfort of the fabric.

[0039] 2. The composite fiber containing nano-natural tea fibers provided by the present invention can evenly disperse multiple soluble or insoluble effective ingredients in tea leaves in the mate nanofiber microemulsion by a microemulsion method, so that the multifunctionality of the fabric can be effectively exerted; the microemulsion system has high uniformity and long-term stability, and the nano-tea fibers can be highly dispersed in the spinning solution without the need to add additional surfactants during the spinning process of the composite fiber, and the effect of the functional fabric obtained can be long-lasting. The preparation process of the mate nanofiber microemulsion is simple, and it can be seamlessly connected with the spinning process, improve production efficiency, and is 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. There are a variety of tea polyphenols in yerba mate, including catechins, flavonoid compounds, etc. Yerba mate also contains theaflavins, saponin compounds and unique yerba mate. Applying yerba mate to fibers to make fabrics that can be used close to the body 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 absorb 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 moisture, keep the skin moist and soft, and reduce dryness and roughness. In addition, the antioxidant components in yerba mate can reduce the generation of free radicals, protect the skin from oxidative damage, help delay skin aging, and keep the skin healthy and young.

[0041] 4. A composite fiber containing nano-natural tea fiber provided by the present invention introduces a mate tea nanofiber microemulsion, which contains a unique mate alkaloid component. Mate alkaloid is a natural alkaloid, similar to caffeine, but has different physiological effects. The application of mate alkaloid in natural tea fiber can bring multiple effects, especially in antibacterial, deodorizing, refreshing and stress relief. On the one hand, it can cooperate with tea polyphenols to further promote the antibacterial effect. On the other hand, mate alkaloid can stimulate the central nervous system, improve alertness and attention. Wearing tea fiber fabrics containing mate alkaloid can provide a certain degree of refreshing effect, making people feel refreshed. Mate alkaloid has a refreshing effect, but compared with caffeine, its effect is milder, does not cause excessive excitement or anxiety, can help relieve stress, and provide a sense of ease and relaxation. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used 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 content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0043] Example 1

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

[0045] (1) 10 g of yerba mate leaves are crushed by a fluidized bed airflow superfine pulverizer to obtain a yerba mate leaf pre-crushed powder with a particle size of 100 μm, the yerba mate leaf pre-crushed powder is 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 is concentrated by rotary evaporation to 15% of the initial mass, and then the concentrated yerba mate fiber stock solution is ball-milled by a nano ball mill to reduce the particle size of the nano-level yerba mate fibers therein to 60 nm, thereby obtaining a yerba mate nanofiber liquid;

[0046] (2) adding 15 g of polyoxyethylene sorbitan monostearate and 10 g of n-propanol to 20 g of cyclohexane and stirring to obtain a pre-emulsion, and then adding 20 g of yerba mate nanofiber liquid and continuing to stir to make it uniformly dispersed to obtain a yerba mate nanofiber emulsion;

[0047] (3) The yerba mate nanofiber emulsion was added into 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 fiber comprises the following steps: immersing 200g cotton fiber pulp in 18g / L NaOH solution at 35°C for 2h; pressing at 1MPa to a water content of 50wt%; crushing to an average particle size of 3mm; adding 50g CS2 at 30°C for yellowing for 1h; adding the yellowed product to 10wt% NaOH solution and dissolving and ripening at 20°C for 3h; then filtering and vacuum degassing to obtain fiber viscose spinning solution; then adding 30g yerba mate nano fiber microemulsion by pre-spinning injection and mixing evenly to obtain composite fiber spinning solution; then spinning and post-treatment to obtain composite fiber containing nano natural tea fiber.

[0049] Example 2

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

[0051] (1) 15 g of yerba mate leaves are crushed by a fluidized bed airflow superfine pulverizer to obtain a yerba mate leaf pre-crushed powder with a particle size of 100 μm, the yerba mate leaf pre-crushed powder is 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 is concentrated by rotary evaporation to 15% of the initial mass, and then the concentrated yerba mate fiber stock solution is ball-milled by a nano ball mill to reduce the particle size of the nano-level yerba mate fibers therein to 60 nm, thereby obtaining a yerba mate nanofiber liquid;

[0052] (2) adding 18 g of sodium lauryl sulfate and 15 g of isobutyl alcohol 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 make it uniformly dispersed 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 in the composite fiber raw material instead of yerba mate nanofiber microemulsion, and the rest is the same as Example 1.

[0057] The preparation method of the yerba mate fiber extract comprises the following steps: 10 g of yerba mate leaves are crushed by a fluidized bed airflow superfine grinder to obtain a yerba mate pre-crushed powder with a particle size of 100 μm; the yerba mate pre-crushed powder is added to 100 ml of ethanol, and extracted 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 in the composite fiber raw material instead of yerba mate nanofiber microemulsion, 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 crushed by a fluidized bed air flow superfine pulverizer to obtain a green tea pre-crushed powder with a particle size of 100 μm, the green tea pre-crushed 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 by a nano ball mill to make the particle size of the nano-scale green tea fibers therein 60 nm, thereby obtaining a green tea nanofiber liquid;

[0062] (2) adding 15 g of polyoxyethylene sorbitan monostearate and 10 g of n-propanol to 20 g of cyclohexane and stirring to obtain a pre-emulsion, then adding 20 g of green tea fiber extract and continuing to stir to make it uniformly dispersed to obtain a green tea nanofiber emulsion;

[0063] (3) The green tea nanofiber emulsion was added into 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 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-mentioned embodiments and comparative examples are subjected to carding, spinning and weaving processes to obtain composite fiber fabrics, and the obtained fabrics are subjected to relevant performance tests. The specific test standards are as follows:

[0067] The 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 concentration of odorous gas in the container is measured using a gas chromatograph;

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

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

[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 embodiments and comparative examples

[0074]

[0075] The obtained fabric was tested for antibacterial properties, and the inhibition rates of 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 determined by spectrophotometry 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 embodiments that the composite fiber containing nano natural tea fiber prepared by 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, and the introduction of nano tea fiber microemulsion can also enhance the mechanical properties of the fiber. Composite with the 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 to be illustrative in all aspects and not limiting of the present invention, 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 claimed invention.

[0082] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0083] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is 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, and the nano natural tea fiber is yerba mate nano fiber microemulsion; The preparation method of the yerba mate nanofiber microemulsion comprises the following steps: (1) extracting effective ingredients from yerba mate 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 make it uniformly dispersed to obtain a yerba mate nanofiber emulsion; (3) Adding the yerba mate nanofiber emulsion into the aqueous phase and homogenizing under pressure, and then performing ultrasound and adjusting the pH to obtain the yerba mate nanofiber microemulsion.

2. A composite fiber containing nano natural tea fibers according to claim 1, characterized in that: In the step (1), extracting effective ingredients from yerba mate leaves comprises the following steps: pre-crushing yerba mate leaves to obtain pre-crushed yerba mate leaves powder; adding the pre-crushed yerba mate leaves powder to an extractant for extraction to obtain a yerba mate fiber stock solution; 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; The particle size of the yerba mate 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 1-20h; 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-grade yerba mate fibers, and the particle size of the nanometer-grade 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 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; 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, dimethyl silicone 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, flax fiber pulp and hemp fiber pulp.

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

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 nano-sized natural tea fiber-containing composite fiber is obtained by processing the composite 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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