A lavender and valerian modified plant-based fiber and preparation method thereof

Abstract

The present application relates to the technical field of functional fiber preparation, and specifically discloses a lavender and valerian modified plant-based fiber and a preparation method thereof. The modified plant-based fiber is prepared by the following method: lavender and valerian are washed, dried, and then crushed to obtain plant powder, and the plant powder is used as a raw material for extraction treatment to obtain a plant extract; nanographene sheets are added to a silane coupling agent hydrolyzate, and the plant extract is added for ultrasonic dispersion treatment, and then a sodium alginate coating liquid is added and fully stirred and mixed, and then dried and solidified to obtain a functional filler; a cellulose solution, a functional filler, epoxy soybean oil and a stearate are blended and wet-spun to obtain the fiber; the modified plant-based fiber prepared by the above preparation method can significantly improve the health care performance and antibacterial and anti-inflammatory performance of the fiber while ensuring excellent mechanical properties and thermal stability, and increase the moisture absorption and air permeability of the fiber.

Description

Technical Field

[0001] The present application relates to the technical field of functional fiber preparation, and more specifically, to a lavender and valerian modified plant-based fiber and a preparation method thereof. Background Art

[0002] Regenerated cellulose fibers are fibers made from cellulose extracted from nature after chemical treatment and transformation. The most common ones are bamboo fiber, chitin fiber, lyocell fiber and modal fiber. Regenerated cellulose fibers are widely used in the textile industry because they combine the advantages of natural fibers and synthetic fibers. They are used to produce various clothing, household items, industrial products, etc. They are popular among consumers for their good moisture absorption, breathability and soft feel, and have potential in environmental protection and sustainability.

[0003] Regenerated cellulose fiber is commonly used as a filling material in furniture, baby products, toys, and sleep products. For example, lyocell fiber can be used as a filling for pillows and bedding because of its good air permeability and moisture absorption. The pillow core filled with lyocell fiber can provide moderate neck support, help relieve cervical fatigue, and can maintain its shape for a long time and is not easy to deform. Although regenerated cellulose fiber has some advantages in pillow filling, its durability is poor. Long-term use can easily lead to moisture and heat accumulation inside the pillow. It is also very easy to cause problems such as odor and mold growth inside the pillow, so it needs to be replaced frequently.

[0004] As people's living standards improve, consumers have higher and higher requirements for the health and functionality of bedding. In order to further improve the comprehensive performance of regenerated cellulose fibers, people began to study and apply modified plant-based fibers. Modified plant-based fibers usually use natural plant extracts as modifiers or additives. The plant extracts are made into a treatment liquid and then impregnated into the regenerated cellulose fibers, thereby giving the regenerated cellulose fibers more excellent antibacterial properties, comfort and health care. However, although the above-mentioned treatment liquid impregnation treatment method can improve the antibacterial properties and comfort of the regenerated cellulose fibers to a certain extent, the modification effect is not lasting. Based on the above statements, the present application provides a lavender and valerian modified plant-based fiber and a preparation method thereof. Summary of the invention

[0005] In order to improve the healthiness and functionality of regenerated cellulose fibers and prolong the modification effect, the present application provides a lavender and valerian modified plant-based fiber and a preparation method thereof.

[0006] In the first aspect, the present application provides a method for preparing lavender and valerian modified plant-based fibers, using the following technical solution:

[0007] A method for preparing lavender and valerian modified plant-based fibers, comprising the following preparation steps:

[0008] S1. Preparation of plant extracts:

[0009] Washing, drying and crushing lavender and valerian to obtain plant powder, using the plant powder as a raw material for extraction treatment to obtain a plant extract;

[0010] S2. Preparation of functional fillers:

[0011] The nanographene sheets are added to the hydrolyzed solution of silane coupling agent, the plant extract is added for ultrasonic dispersion treatment, the sodium alginate coating solution is added, the mixture is fully stirred and mixed, and the functional filler is obtained by drying and solidification;

[0012] S3. Preparation of modified plant-based fibers:

[0013] The cellulose solution, functional filler, epoxidized soybean oil and stearate are blended and then wet-spun to obtain the desired modified plant-based fiber.

[0014] Preferably, the extraction process in step S1 is specifically divided into two times, firstly, the plant powder is initially extracted by steam distillation to collect extract I, then the plant powder is ultrasonically extracted with ethanol aqueous solution at a mass ratio of 1:8-12, the filter residue is removed by filtration to obtain extract II, and the extract I and extract II are combined to obtain the plant extract.

[0015] Preferably, the silane coupling agent hydrolyzate in step S2 is prepared by the following method: controlling the mass ratio to be 1:20-24, adding the silane coupling agent to an ethanol aqueous solution, and performing a hydrolysis reaction at a temperature of 50-60° C. for 1-2 hours to obtain the silane coupling agent hydrolyzate.

[0016] Preferably, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane and / or N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0017] Preferably, the sodium alginate coating solution in step S2 is prepared by the following method: controlling the mass ratio of sodium alginate, stabilizer and water to be 5-6:2-3:22, adding water to sodium alginate and stirring until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain the sodium alginate coating solution.

[0018] Preferably, the stabilizer comprises sophorolipids and polyethylene glycol in a mass ratio of 3-5:1.

[0019] Preferably, the raw materials in step S3 are selected in the following weight parts: 80-100 weight parts of cellulose solution, 20-30 weight parts of functional filler, 3-8 weight parts of epoxidized soybean oil, and 1-3 weight parts of stearate.

[0020] Preferably, the cellulose solution is obtained by dissolving cellulose pulp in an aqueous solution of N-methylmorpholine-N-oxide.

[0021] Preferably, the wet spinning in step S3 specifically includes: spinning the blended liquid through a spinning machine at a temperature of 70-90°C, solidifying it with an acetic acid aqueous solution with a temperature of 20-25°C and a mass concentration of 33-38% as a solidifying liquid, stretching it with a stretching multiple of 2-3 times, washing it with ethanol and then drying it at a temperature of 40-60°C.

[0022] In the second aspect, the present application provides a lavender and valerian modified plant-based fiber, using the following technical solution:

[0023] A lavender and valerian modified plant-based fiber is prepared by the preparation method of the lavender and valerian modified plant-based fiber.

[0024] In summary, this application has the following beneficial effects:

[0025] 1. Both lavender and valerian have significant sedative and hypnotic, relaxing and soothing, calming the mind, antibacterial and anti-inflammatory effects. The dual extraction methods of steam extraction and solvent extraction can effectively extract different active ingredients, expand the extraction spectrum, and improve the extraction efficiency, thereby improving the efficacy and quality of the product.

[0026] 2. In the present application, a stabilizer is prepared by compounding sophorolipids and polyethylene glycol. The sodium alginate coating solution is prepared by adding a stabilizer to the sodium alginate solution. On the one hand, the addition of the stabilizer can change the interaction force between the gel particles, increase the viscosity and viscoelasticity of the sodium alginate gel, and make the gel form a stable coating layer, thereby slowing down the diffusion rate of the active substance; on the other hand, the stabilizer can also interact with the active substance to form a composite structure to provide additional protection, further slow down the release of the active substance, and protect the active substance from the influence and degradation of the external environment.

[0027] 3. The present application gives priority to utilizing nano-graphene sheets to fully absorb plant extracts. The high specific surface area of ​​the nano-graphene sheets and the natural antioxidant properties of the plant extracts can effectively prevent the degradation of active ingredients due to the influence of the external environment; a sodium alginate coating liquid is used to form a stable coating layer on the surface of the nano-graphene sheets; on the one hand, the structure of the sodium alginate gel can effectively prevent the premature release of active ingredients and delay the release rate of active ingredients; on the other hand, the cross-linking effect between sodium alginate molecules can increase the cross-linking density of the final fiber and improve the mechanical properties and moisture absorption and air permeability of the fiber product; the functional filler prepared in the present application can enhance the mechanical properties and thermal stability of the modified fiber while improving the health care properties and antibacterial and anti-inflammatory properties of the fiber and increasing the moisture absorption and air permeability of the fiber. DETAILED DESCRIPTION

[0028] In order to make the implementation methods of the present application easier to understand, the present application will be described in detail below in conjunction with specific examples. These examples are only for illustration and are not limited to the scope of application of the present application.

[0029] Example 1

[0030] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0031] S1. Preparation of plant extracts:

[0032] Fresh lavender and valerian are collected, washed, dried, and then crushed through an 80-mesh sieve, lavender powder and valerian powder are mixed at a mass ratio of 1:3 to obtain plant powder, the plant powder is initially extracted for 2 hours by steam distillation to collect extract I, and then the plant powder is ultrasonically extracted with an ethanol aqueous solution with a mass concentration of 55% at a mass ratio of 1:8, the ultrasonic temperature is controlled to be 50° C., the ultrasonic power is 280 W, the ultrasonic frequency is 40 kHz, the ultrasonic extraction is performed for 2 hours, the filter residue is removed by filtration to obtain extract II, and the extract I and extract II are combined to obtain a plant extract;

[0033] S2. Preparation of functional fillers:

[0034] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0035] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 200 in a mass ratio of 3:1;

[0036] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, the stirring treatment is carried out at a temperature of 50°C for 2h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is carried out for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained, wherein the mass ratio of the nano-graphene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 4:18:1:10;

[0037] S3. Preparation of modified plant-based fibers:

[0038] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0039] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0040] S33. 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate are stirred and mixed at a speed of 350 r / min for 40 minutes, and the mixture is spun by a spinning machine at a temperature of 70°C, and solidified with an acetic acid aqueous solution with a temperature of 20°C and a mass concentration of 38% as a solidifying liquid, and stretched at a stretching multiple of 2 times. After washing with ethanol, it is dried at a temperature of 60°C to obtain a modified plant-based fiber with a fineness of 2.2 dtex.

[0041] Example 2

[0042] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0043] S1. Preparation of plant extracts:

[0044] Collect fresh lavender and valerian, wash and dry them, and then crush them through an 80-mesh sieve, mix lavender powder and valerian powder in a mass ratio of 1:2 to obtain plant powder, use steam distillation to initially extract the plant powder for 2.5 hours to collect extract I, then add 60% ethanol aqueous solution to the plant powder for ultrasonic extraction in a mass ratio of 1:9, control the ultrasonic temperature to 50°C, the ultrasonic power to 300W, the ultrasonic frequency to 42kHz, and perform ultrasonic extraction for 1.8 hours, filter and remove the filter residue to obtain extract II, and combine extract I and extract II to obtain a plant extract;

[0045] S2. Preparation of functional fillers:

[0046] S21, controlling the mass ratio to be 1:21, adding the silane coupling agent to a 68% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 52° C. for 1.8 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:2;

[0047] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:3:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 200 in a mass ratio of 3.5:1;

[0048] S23, prepare nanographene sheets (thickness: 4-20 nm, diameter: 5-10 μm, number of layers: <30, density: 0.23 g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 380r / min, the stirring treatment is carried out at a temperature of 52°C for 1.8h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 300W, the ultrasonic frequency is 42kHz, the ultrasonic dispersion treatment is carried out for 1.8h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 1.2h, and the functional filler is obtained, wherein the mass ratio of the nanographene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 6:18:1:10;

[0049] S3. Preparation of modified plant-based fibers:

[0050] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4.2, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite, and water in a mass ratio of 1:3.2:18;

[0051] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide with a mass concentration of 58% at a mass ratio of 1:6.5, stirring at a temperature of 98° C. until completely dissolved, to obtain a cellulose solution;

[0052] S33. 85 parts by weight of cellulose solution, 22 parts by weight of functional filler, 4 parts by weight of epoxidized soybean oil and 1.5 parts by weight of potassium stearate are stirred and mixed at a speed of 380 r / min for 38 minutes, and the mixture is spun by a spinning machine at a temperature of 75°C, and solidified with an acetic acid aqueous solution with a temperature of 21°C and a mass concentration of 36% as a solidifying liquid. The fiber is stretched at a stretching multiple of 2.2 times, washed with ethanol, and dried at a temperature of 55°C to obtain a modified plant-based fiber with a fineness of 2.7 dtex.

[0053] Example 3

[0054] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0055] S1. Preparation of plant extracts:

[0056] Collect fresh lavender and valerian, wash and dry them, and then crush them through an 80-mesh sieve, mix lavender powder and valerian powder in a mass ratio of 1:1 to obtain plant powder, use steam distillation to initially extract the plant powder for 3 hours to collect extract I, then add 65% ethanol aqueous solution to the plant powder for ultrasonic extraction in a mass ratio of 1:10, control the ultrasonic temperature to 50°C, the ultrasonic power to 310W, the ultrasonic frequency to 45kHz, and perform ultrasonic extraction for 1.5 hours, filter and remove the filter residue to obtain extract II, and combine extract I and extract II to obtain a plant extract;

[0057] S2. Preparation of functional fillers:

[0058] S21, controlling the mass ratio to be 1:22, adding the silane coupling agent to a 70% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 55° C. for 1.5 h to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:1;

[0059] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 6:2:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 400 in a mass ratio of 4:1;

[0060] S23, prepare nanographene sheets (thickness: 4-20 nm, diameter: 5-10 μm, number of layers: <30, density: 0.23 g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to 400r / min, the stirring treatment is carried out at a temperature of 55°C for 1.5h, the plant extract is added, the ultrasonic temperature is controlled to 50°C, the ultrasonic power is 310W, the ultrasonic frequency is 45kHz, the ultrasonic dispersion treatment is carried out for 1.5h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 1.5h, and the functional filler is obtained, wherein the mass ratio of the nanographene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 5:19:1:11;

[0061] S3. Preparation of modified plant-based fibers:

[0062] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4.5, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite, and water in a mass ratio of 1:3.5:18;

[0063] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide with a mass concentration of 60% at a mass ratio of 1:7, stirring at a temperature of 95° C. until completely dissolved, to obtain a cellulose solution;

[0064] S33. 90 parts by weight of cellulose solution, 25 parts by weight of functional filler, 5 parts by weight of epoxidized soybean oil and 2 parts by weight of potassium stearate are stirred and mixed at a speed of 400 r / min for 35 minutes, and the mixture is spun by a spinning machine at a temperature of 80°C, and solidified with an acetic acid aqueous solution with a temperature of 23°C and a mass concentration of 35% as a solidifying liquid, and stretched at a stretching multiple of 2.5 times. After washing with ethanol, it is dried at a temperature of 50°C to obtain a modified plant-based fiber with a fineness of 2.9 dtex.

[0065] Example 4

[0066] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0067] S1. Preparation of plant extracts:

[0068] Collect fresh lavender and valerian, wash and dry them, and then crush them through an 80-mesh sieve, mix lavender powder and valerian powder in a mass ratio of 2:1 to obtain plant powder, use steam distillation to initially extract the plant powder for 3.5 hours to collect extract I, then add 70% ethanol aqueous solution to the plant powder for ultrasonic extraction in a mass ratio of 1:11, control the ultrasonic temperature to 50°C, the ultrasonic power to 320W, the ultrasonic frequency to 48kHz, and extract for 1.2 hours, filter and remove the filter residue to obtain extract II, and combine extract I and extract II to obtain a plant extract;

[0069] S2. Preparation of functional fillers:

[0070] S21, controlling the mass ratio to be 1:23, adding the silane coupling agent to an ethanol aqueous solution having a mass fraction of 72%, and hydrolyzing the mixture at a temperature of 58° C. for 1.2 h to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 2:1;

[0071] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 6:3:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 400 in a mass ratio of 4.5:1;

[0072] S23, prepare nanographene sheets (thickness: 4-20 nm, diameter: 5-10 μm, number of layers: <30, density: 0.23 g / cm 3) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to 420r / min, the stirring treatment is carried out at a temperature of 58°C for 1.2h, the plant extract is added, the ultrasonic temperature is controlled to 50°C, the ultrasonic power is 320W, the ultrasonic frequency is 48kHz, the ultrasonic dispersion treatment is carried out for 1.2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 1.8h, and the functional filler is obtained at a temperature of 80°C. The mass ratio of the nanographene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 6:18:1:12;

[0073] S3. Preparation of modified plant-based fibers:

[0074] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4.8, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite, and water in a mass ratio of 1:3.8:18;

[0075] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 62% at a mass ratio of 1:7.5, stirring at a temperature of 98° C. until completely dissolved, to obtain a cellulose solution;

[0076] S33. 95 parts by weight of cellulose solution, 28 parts by weight of functional filler, 7 parts by weight of epoxidized soybean oil and 2.5 parts by weight of potassium stearate are stirred and mixed at a speed of 420 r / min for 32 minutes, and the mixture is spun by a spinning machine at a temperature of 85°C, and solidified with an acetic acid aqueous solution with a temperature of 24°C and a mass concentration of 34% as a solidifying liquid, and stretched at a stretching multiple of 2.8 times. After washing with ethanol, it is dried at a temperature of 55°C to obtain a modified plant-based fiber with a fineness of 1.9 dtex.

[0077] Example 5

[0078] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0079] S1. Preparation of plant extracts:

[0080] Fresh lavender and valerian are collected, washed, dried, and then crushed through an 80-mesh sieve, lavender powder and valerian powder are mixed at a mass ratio of 3:1 to obtain plant powder, the plant powder is initially extracted for 4 hours by steam distillation to collect extract I, and then the plant powder is ultrasonically extracted with an ethanol aqueous solution with a mass concentration of 75% at a mass ratio of 1:12, the ultrasonic temperature is controlled to be 50° C., the ultrasonic power is 340 W, the ultrasonic frequency is 50 kHz, the ultrasonic extraction is performed for 1 hour, the filter residue is removed to obtain extract II, and the extract I and extract II are combined to obtain the plant extract;

[0081] S2. Preparation of functional fillers:

[0082] S21, controlling the mass ratio to be 1:24, adding the silane coupling agent to an ethanol aqueous solution having a mass fraction of 75%, and hydrolyzing the mixture at a temperature of 60° C. for 1 hour to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 3:1;

[0083] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:3:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 600 in a mass ratio of 5:1;

[0084] S23, prepare nanographene sheets (thickness: 4-20 nm, diameter: 5-10 μm, number of layers: <30, density: 0.23 g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 450r / min, the stirring treatment is carried out at a temperature of 60°C for 1h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 340W, the ultrasonic frequency is 50kHz, the ultrasonic dispersion treatment is carried out for 1h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained by drying and curing at a temperature of 80°C, wherein the mass ratio of the nanographene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 6:20:1:12;

[0085] S3. Preparation of modified plant-based fibers:

[0086] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:5, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:4:18;

[0087] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide with a mass concentration of 65% at a mass ratio of 1:8, stirring at a temperature of 90° C. until completely dissolved, to obtain a cellulose solution;

[0088] S33. 100 parts by weight of cellulose solution, 30 parts by weight of functional filler, 8 parts by weight of epoxidized soybean oil and 3 parts by weight of potassium stearate are stirred and mixed at a speed of 450 r / min for 30 minutes, and the mixture is spun by a spinning machine at a temperature of 90°C, and solidified with an acetic acid aqueous solution with a temperature of 25°C and a mass concentration of 33% as a solidifying liquid, and stretched at a stretching multiple of 3 times. After washing with ethanol, it is dried at a temperature of 40°C to obtain a modified plant-based fiber with a fineness of 2.5 dtex.

[0089] In order to verify the comprehensive performance of the modified plant-based fibers prepared in Examples 1-5 of the present application, the applicant set up contrast agents 1-5, as follows:

[0090] Comparative Example 1

[0091] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0092] S1. Preparation of plant extracts:

[0093] Collect fresh lavender and valerian, wash and dry them, and then crush them through an 80-mesh sieve. Mix lavender powder and valerian powder in a mass ratio of 1:3 to obtain plant powder. Use steam distillation to initially extract the plant powder for 4 hours to obtain a plant extract.

[0094] S2. Preparation of functional fillers:

[0095] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0096] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 200 in a mass ratio of 3:1;

[0097] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, the stirring treatment is carried out at a temperature of 50°C for 2h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is carried out for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained, wherein the mass ratio of the nano-graphene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 4:18:1:10;

[0098] S3. Preparation of modified plant-based fibers:

[0099] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0100] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0101] S33. 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate are stirred and mixed at a speed of 350 r / min for 40 minutes, and the mixture is spun by a spinning machine at a temperature of 70°C, and solidified with an acetic acid aqueous solution with a temperature of 20°C and a mass concentration of 38% as a solidifying liquid, and stretched at a stretching multiple of 2 times. After washing with ethanol, it is dried at a temperature of 60°C to obtain a modified plant-based fiber with a fineness of 2.2 dtex.

[0102] Comparative Example 2

[0103] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0104] S1. Preparation of plant extracts:

[0105] Collect fresh lavender and valerian, wash and dry them, and then crush them through an 80-mesh sieve, mix lavender powder and valerian powder in a mass ratio of 1:3 to obtain plant powder, add 55% ethanol aqueous solution to the plant powder for ultrasonic extraction, control the ultrasonic temperature to 50°C, the ultrasonic power to 280W, the ultrasonic frequency to 40kHz, perform ultrasonic extraction for 4 hours, and filter to remove the filter residue to obtain the plant extract;

[0106] S2. Preparation of functional fillers:

[0107] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0108] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 200 in a mass ratio of 3:1;

[0109] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, the stirring treatment is carried out at a temperature of 50°C for 2h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is carried out for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained, wherein the mass ratio of the nano-graphene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 4:18:1:10;

[0110] S3. Preparation of modified plant-based fibers:

[0111] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0112] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0113] S33. 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate are stirred and mixed at a speed of 350 r / min for 40 minutes, and the mixture is spun by a spinning machine at a temperature of 70°C, and solidified with an acetic acid aqueous solution with a temperature of 20°C and a mass concentration of 38% as a solidifying liquid, and stretched at a stretching multiple of 2 times. After washing with ethanol, it is dried at a temperature of 60°C to obtain a modified plant-based fiber with a fineness of 2.2 dtex.

[0114] Comparative Example 3

[0115] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0116] S1. Preparation of plant extracts:

[0117] Fresh lavender and valerian are collected, washed, dried, and then crushed through an 80-mesh sieve, lavender powder and valerian powder are mixed at a mass ratio of 1:3 to obtain plant powder, the plant powder is initially extracted for 2 hours by steam distillation to collect extract I, and then the plant powder is ultrasonically extracted with an ethanol aqueous solution with a mass concentration of 55% at a mass ratio of 1:8, the ultrasonic temperature is controlled to be 50° C., the ultrasonic power is 280 W, the ultrasonic frequency is 40 kHz, the ultrasonic extraction is performed for 2 hours, the filter residue is removed by filtration to obtain extract II, and the extract I and extract II are combined to obtain a plant extract;

[0118] S2. Preparation of functional fillers:

[0119] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0120] S22, controlling the mass ratio of sodium alginate, sophorolipid and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until completely dissolved, adding sophorolipid and continuing to stir until completely dissolved, to obtain a sodium alginate coating solution;

[0121] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, the stirring treatment is carried out at a temperature of 50°C for 2h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is carried out for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained, wherein the mass ratio of the nano-graphene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 4:18:1:10;

[0122] S3. Preparation of modified plant-based fibers:

[0123] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0124] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0125] S33. 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate are stirred and mixed at a speed of 350 r / min for 40 minutes, and the mixture is spun by a spinning machine at a temperature of 70°C, and solidified with an acetic acid aqueous solution with a temperature of 20°C and a mass concentration of 38% as a solidifying liquid, and stretched at a stretching multiple of 2 times. After washing with ethanol, it is dried at a temperature of 60°C to obtain a modified plant-based fiber with a fineness of 2.2 dtex.

[0126] Comparative Example 4

[0127] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0128] S1. Preparation of plant extracts:

[0129] Fresh lavender and valerian are collected, washed, dried, and then crushed through an 80-mesh sieve, lavender powder and valerian powder are mixed at a mass ratio of 1:3 to obtain plant powder, the plant powder is initially extracted for 2 hours by steam distillation to collect extract I, and then the plant powder is ultrasonically extracted with an ethanol aqueous solution with a mass concentration of 55% at a mass ratio of 1:8, the ultrasonic temperature is controlled to be 50° C., the ultrasonic power is 280 W, the ultrasonic frequency is 40 kHz, the ultrasonic extraction is performed for 2 hours, the filter residue is removed by filtration to obtain extract II, and the extract I and extract II are combined to obtain a plant extract;

[0130] S2. Preparation of functional fillers:

[0131] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0132] S22, controlling the mass ratio of sodium alginate, polyethylene glycol 200 and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until completely dissolved, adding polyethylene glycol 200 and continuing to stir until completely dissolved, to obtain a sodium alginate coating solution;

[0133] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, the stirring treatment is carried out at a temperature of 50°C for 2h, the plant extract is added, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is carried out for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained, wherein the mass ratio of the nano-graphene sheet, the silane coupling agent hydrolyzate, the plant extract and the sodium alginate coating solution is 4:18:1:10;

[0134] S3. Preparation of modified plant-based fibers:

[0135] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0136] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0137] S33. 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate are stirred and mixed at a speed of 350 r / min for 40 minutes, and the mixture is spun by a spinning machine at a temperature of 70°C, and solidified with an acetic acid aqueous solution with a temperature of 20°C and a mass concentration of 38% as a solidifying liquid, and stretched at a stretching multiple of 2 times. After washing with ethanol, it is dried at a temperature of 60°C to obtain a modified plant-based fiber with a fineness of 2.2 dtex.

[0138] Comparative Example 5

[0139] A lavender and valerian modified plant-based fiber is prepared by the following preparation method:

[0140] S1. Preparation of plant extracts:

[0141] Fresh lavender and valerian are collected, washed, dried, and then crushed through an 80-mesh sieve, lavender powder and valerian powder are mixed at a mass ratio of 1:3 to obtain plant powder, the plant powder is initially extracted for 2 hours by steam distillation to collect extract I, and then the plant powder is ultrasonically extracted with an ethanol aqueous solution with a mass concentration of 55% at a mass ratio of 1:8, the ultrasonic temperature is controlled to be 50° C., the ultrasonic power is 280 W, the ultrasonic frequency is 40 kHz, the ultrasonic extraction is performed for 2 hours, the filter residue is removed by filtration to obtain extract II, and the extract I and extract II are combined to obtain a plant extract;

[0142] S2. Preparation of functional fillers:

[0143] S21, controlling the mass ratio to be 1:20, adding the silane coupling agent to a 65% by mass ethanol aqueous solution, and hydrolyzing the mixture at a temperature of 50° C. for 2 hours to obtain a silane coupling agent hydrolyzate, wherein the silane coupling agent comprises γ-glycidyloxypropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 1:3;

[0144] S22, controlling the mass ratio of sodium alginate, stabilizer and water to be 5:2:22, adding water to sodium alginate and stirring at room temperature until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain a sodium alginate coating solution, wherein the stabilizer includes sophorolipids and polyethylene glycol 200 in a mass ratio of 3:1;

[0145] S23, nanographene sheets (thickness: 4-20nm, diameter: 5-10μm, density: 0.23g / cm 3 ) is added to the silane coupling agent hydrolyzate, the stirring speed is controlled to be 350r / min, after stirring at a temperature of 50°C for 2h, the ultrasonic temperature is controlled to be 50°C, the ultrasonic power is 280W, the ultrasonic frequency is 40kHz, the ultrasonic dispersion treatment is performed for 2h, and finally the sodium alginate coating solution is added and the stirring and mixing is continued for 2h, and the functional filler is obtained by drying and curing at a temperature of 80°C, wherein the mass ratio of the nanographene sheet, the silane coupling agent hydrolyzate and the sodium alginate coating solution is 2:9:5;

[0146] S3. Preparation of modified plant-based fibers:

[0147] S31. Add pine pulp with a solid content of 50% to a pulping liquor in a mass ratio of 1:4, boil for 2 hours, and then filter. Immerse the filter residue in a sodium hypochlorite solution with a mass concentration of 22%, stir for 1 hour at a temperature of 60° C., filter, wash the filter residue, and dry to obtain cellulose pulp, wherein the pulping liquor is obtained by mixing sodium hydroxide, sodium sulfite and water in a mass ratio of 1:3:18;

[0148] S32, adding cellulose pulp to an aqueous solution of N-methylmorpholine-N-oxide having a mass concentration of 55% at a mass ratio of 1:6, stirring at a temperature of 100° C. until the cellulose pulp is completely dissolved, to obtain a cellulose solution;

[0149] S33, 80 parts by weight of cellulose solution, 20 parts by weight of functional filler, 3 parts by weight of epoxidized soybean oil and 1 part by weight of potassium stearate were stirred and mixed at a speed of 350 r / min for 40 minutes, the mixed solution was spun by a spinning machine at a temperature of 70°C, cured with an acetic acid aqueous solution at a temperature of 20°C and a mass concentration of 38% as a curing liquid, stretched at a draft multiple of 2 times, washed with ethanol and dried at a temperature of 60°C to obtain a plant-based fiber with a fineness of 2.2 dtex;

[0150] S34, controlling the mass ratio to be 1:18, adding the plant extract to the silane coupling agent hydrolyzate, at a temperature of 45°C, controlling the ultrasonic temperature to be 50°C, the ultrasonic power to be 280W, and the ultrasonic frequency to be 40kHz, after ultrasonic dispersion treatment for 2 hours, adding the plant-based fiber to the solution containing the plant extract, soaking for 4 hours, taking out and drying to obtain the modified plant-based fiber.

[0151] Performance Testing

[0152] The comprehensive properties of the modified base fibers prepared in Examples 1-5 of the present application and Comparative Examples 1-5 were tested respectively.

[0153] Breaking strength and breaking elongation: tested in accordance with the test standard GB / T 14344-2022;

[0154] Hygroscopicity: Take 10g of each sample to be tested and place it in a drying oven at 80°C to dry to constant weight. Record the weight of each sample after drying, recorded as W0. Place each dried sample in an environment with a temperature of 37°C and a relative humidity of 90% for 8h, and measure the weight of each sample after moisture absorption, recorded as W1. Moisture absorption rate (%) = (W1-W0) / W0×100;

[0155] Air permeability: Each sample to be tested is opened, combed, laid into a mesh, and then hot-rolled and reinforced to make a gram weight of 40g / m 2 , non-woven fabric samples with a thickness of 0.5 mm were tested according to the test standard GB / T 5453-1997. The different parts of each non-woven fabric sample were measured 10 times, and the average value was calculated as the final air permeability of the test sample;

[0156] Antibacterial property: tested in accordance with the test standard GB / T 20944.3-2008, the test strain is Staphylococcus aureus;

[0157] Aroma release cycle: Take 10g of each sample to be tested and place it in a sealed bag. Seal it at 60℃ for 1h and smell it. This is considered a cycle. Repeat the test until the aroma is completely lost. Record the number of cycle tests when the aroma is lost.

[0158] Sleep-aiding effect: Each sample to be tested was filled into a pillow to be tested. 22 volunteers aged 35-55 years with an average sleep onset time greater than 30 minutes, an average total sleep time less than 7 hours, an average deep sleep time less than 0.8 hours in the past two months were selected and randomly divided into 11 groups, each using a pillow to be tested. A sleep monitor was used to monitor the sleep of the volunteers for 8 hours. The monitoring indicators were sleep onset time and deep sleep time. The monitoring period was 30 days. After eliminating the values ​​with obvious deviations in the monitored data, the remaining data were averaged to obtain the average sleep onset time t1 and the average deep sleep time t2.

[0159] The specific performance test results are shown in Table 1:

[0160]

[0161] It can be seen from the results shown in Table 1 above that the comprehensive performance of the modified base fibers prepared in Examples 1-5 of the present application is significantly better than that of the modified base fibers prepared in Comparative Examples 1-5, that is, within the technical scheme defined in the present application, the prepared modified base fibers can significantly improve the health care properties and antibacterial and anti-inflammatory properties of the fibers while ensuring excellent mechanical properties and thermal stability, and increase the moisture absorption and air permeability of the fibers.

[0162] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for preparing lavender and valerian modified plant-based fibers, characterized in that: The method comprises the following preparation steps: S1. Preparation of plant extracts: Washing, drying and crushing lavender and valerian to obtain plant powder, using the plant powder as a raw material for extraction treatment to obtain a plant extract; S2. Preparation of functional fillers: The nanographene sheets are added to the hydrolyzed solution of silane coupling agent, the plant extract is added for ultrasonic dispersion treatment, the sodium alginate coating solution is added, the mixture is fully stirred and mixed, and the functional filler is obtained by drying and solidification; S3. Preparation of modified plant-based fibers: The cellulose solution, the functional filler, the epoxidized soybean oil and the stearate are mixed and then wet-spun to obtain the desired modified plant-based fiber; The sodium alginate coating solution in step S2 is prepared by the following method: controlling the mass ratio of sodium alginate, stabilizer and water to be 5-6:2-3:22, adding water to sodium alginate and stirring until it is completely dissolved, adding stabilizer and continuing to stir until it is completely dissolved, to obtain the sodium alginate coating solution; The stabilizer comprises sophorolipids and polyethylene glycol in a mass ratio of 3-5:

1.

2. The method for preparing lavender and valerian modified plant-based fibers according to claim 1, characterized in that: The extraction process in step S1 is specifically divided into two times. First, the plant powder is initially extracted by steam distillation to collect extract I. Then, the plant powder is ultrasonically extracted with ethanol aqueous solution at a mass ratio of 1:8-12, and the filter residue is removed by filtration to obtain extract II. The extract I and extract II are combined to obtain the plant extract.

3. The method for preparing lavender and valerian modified plant-based fibers according to claim 1, characterized in that: The silane coupling agent hydrolyzate in step S2 is prepared by the following method: controlling the mass ratio to be 1:20-24, adding the silane coupling agent to an ethanol aqueous solution, and performing a hydrolysis reaction at a temperature of 50-60° C. for 1-2 hours to obtain the silane coupling agent hydrolyzate.

4. The method for preparing lavender and valerian modified plant-based fibers according to claim 3, characterized in that: The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane and / or N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

5. The method for preparing lavender and valerian modified plant-based fibers according to claim 1, characterized in that: In step S3, the raw materials are selected in the following weight parts: 80-100 weight parts of cellulose solution, 20-30 weight parts of functional filler, 3-8 weight parts of epoxidized soybean oil, and 1-3 weight parts of stearate.

6. The method for preparing lavender and valerian modified plant-based fibers according to claim 5, characterized in that: The cellulose solution is obtained by dissolving cellulose pulp in an aqueous solution of N-methylmorpholine-N-oxide.

7. The method for preparing lavender and valerian modified plant-based fibers according to claim 1, characterized in that: The wet spinning in step S3 specifically includes: spinning the blended liquid through a spinning machine at a temperature of 70-90°C, solidifying it with an acetic acid aqueous solution with a temperature of 20-25°C and a mass concentration of 33-38% as a solidifying liquid, stretching it with a stretching multiple of 2-3 times, washing it with ethanol and then drying it at a temperature of 40-60°C.

8. A lavender or valerian modified plant-based fiber, characterized in that: The fiber is prepared by the method for preparing the lavender or valerian modified plant-based fiber according to any one of claims 1 to 7.

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