Biomass natural plant fiber, preparation thereof and application of biomass natural plant fiber in sleep-aiding home textile products

Abstract

The invention belongs to the technical field of textiles, and particularly discloses a biomass natural plant fiber, preparation thereof and application of the biomass natural plant fiber in sleep-aiding home textile products. The biomass natural plant fibers comprise viscose fibers and slow-release porous microcapsules dispersed in the viscose fibers; the slow-release porous microcapsule comprises a capsule core and a capsule wall, the capsule core comprises a porous material PM and natural plant particles, and part of the natural plant particles are located in pores of the porous material PM; the porous material PM is obtained by dispersing a first polymer M in water and then performing double-frequency ultrasonic treatment; the natural plant particles are obtained by uniformly mixing natural plant powder and a stabilizer and then carrying out micro-nano treatment through an ultrasonication method, and the natural plant powder comprises at least one kind of natural plant powder which contains volatile components and has the effects of soothing the nerves and helping sleep. The novel fiber which is good and durable in nerve soothing and sleep aiding effect is researched and developed through combined application of a physical crushing method, a slow-release porous microcapsule and wet spinning, and the novel fiber is suitable for being developed into sleep aiding home textile products.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, and particularly to a biomass natural plant fiber and its preparation and application in sleep-aiding home textile products. Background Art

[0002] With the increasing acceleration of the modern life rhythm and the continuous increase of mental stress, insomnia has become a serious health problem prevalent in today's society. Insomnia not only seriously affects an individual's quality of life but may also lead to a series of health problems such as a decline in immune function, an increased risk of cardiovascular diseases, and memory decline. Clinically common treatment methods include cognitive behavioral therapy and drug treatment. Cognitive behavioral therapy usually requires a relatively long treatment cycle, and the curative effect varies from person to person. Drugs for treating insomnia mainly include sedative-hypnotic drugs. Although they take effect quickly, they are prone to drug resistance and dependence and may also cause adverse reactions such as dizziness and drowsiness.

[0003] Aromatherapy refers to using aromatic scents or essential oils to directly act on the brain through the olfactory system to regulate neurotransmitter levels, thereby improving sleep quality. In addition, aromatherapy can also relieve mood disorders such as anxiety and depression, achieve the effect of regulating the qi movement of the zang-fu organs and harmonizing yin and yang of the body, and further promote sleep. Applying aromatherapy to textiles and developing them into functional textiles, such as clothing and bedding, users can make the fragrance slowly and continuously released through the movement, friction, touch, and extrusion during wearing clothing and using bedding. Through the aromatic scent of natural plants, it can effectively improve sleep quality, relieve insomnia symptoms, and solve the dependence and side effects brought by traditional drug treatment of insomnia.

[0004] For example, Patent CN114164517B provides a polyester fiber containing honeysuckle plant traditional Chinese medicine for antibacterial and antioxidant skin care. It is to purify traditional Chinese medicines such as honeysuckle and then add them to PET chips to make masterbatches, and then melt-extrude them into polyester fibers. This fiber has multifunctions of traditional Chinese medicine antibacterial, antioxidant, and skin care. Since the functional agents are relatively evenly distributed in the fiber, they will not lose their efficacy due to washing, showing excellent wash resistance, and can be used to produce underwear, bedding, towels, knitted products, etc. with antibacterial, odor-proof, antioxidant, and skin care functions. However, using this method, due to the relatively high temperature of the melt spinning process of synthetic fibers, plant components are prone to carbonization, pasting, and blackening at this temperature, resulting in damage or invalidation of active ingredients, wasting plant resources, and increasing production costs. The processing method of a Chinese herbal medicine dipping solution for a sleep-promoting fabric provided by Patent CN102485999A uses a one-bath process of dyeing and finishing for Chinese herbal medicine finishing. Although this method does not have the above problems, it has defects such as low bonding fastness and short-lasting effects. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the object of the present invention is to provide a biomass natural plant fiber and its preparation and application in sleep-aiding home textile products. By combining physical fragmentation, slow-release porous microcapsules, and wet spinning, it solves the problems in the prior art that melt spinning will cause carbonization and decomposition of natural plant components under high-temperature melting conditions, resulting in damage and invalidation of active ingredients, as well as poor bonding fastness, non-persistent effect, and water-wash intolerance in the post-treatment method.

[0006] To achieve the above object and other related objects, the first aspect of the present invention provides a method for preparing a biomass natural plant fiber, including the following steps:

[0007] Preparation of natural plant microparticles:

[0008] Select at least one natural plant containing volatile components and having the effect of calming the nerves and helping sleep. After drying, it is preliminarily pulverized to obtain natural plant powder; a stabilizer is added to water, mixed evenly, and then the natural plant powder is added. Micro-nano treatment is carried out by ultrasonic fragmentation method, and then dried to obtain nano-scale powdered natural plant microparticles;

[0009] Preparation of slow-release porous microcapsules:

[0010] Disperse the first polymer M in an organic solvent, and obtain a porous material PM through dual-frequency ultrasonic treatment; add natural plant microparticles and carry out the first stirring to serve as the oil phase; dissolve the wall material B and the emulsifier in water to prepare the water phase, and slowly add the oil phase to the water phase and carry out the second stirring; after the second stirring ends, obtain the slow-release porous microcapsules by spray drying; the first polymer M is selected from at least one of starch, polyurea resin, or epoxy resin, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate, or gum arabic; Preparation of fiber:

[0011] Add the slow-release porous microcapsules and a cross-linking agent to the viscose spinning dope, mix evenly to obtain a spinning solution, and prepare the biomass natural plant fiber by wet spinning.

[0012] Furthermore, the natural plant is selected from at least one of Albizia julibrissin Durazz., Lavandula angustifolia Mill., Matricaria chamomilla L., Valeriana officinalis L., Citrus aurantium L. var. amara Engl., Citrus bergamia Risso, Vetiveria zizanioides Nash., Melissa officinalis L., Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chow, Aquilaria sinensis (Lour.) Spreng., Platycodon grandiflorus (Jacq.) A. DC., Ligusticum chuanxiong Hort., Lantana camara L., Ligusticum chuanxiong Hort., Eupatorium fortunei Turcz., Perilla frutescens (L.) Britt., or Humulus lupulus L.

[0013] Furthermore, the stabilizer is selected from polyvinylpyrrolidone, including but not limited to K12, K30, K60, and K90, etc.

[0014] Furthermore, the mass ratio of the natural plant powder to the stabilizer is 100:0.2 - 2.

[0015] Furthermore, it is preliminarily pulverized to 100 - 200 meshes.

[0016] Further, the particle size of the natural plant microparticles is 20 nm to 200 nm.

[0017] Further, the ultrasonic frequency used for ultrasonic disruption is 20 kHz to 40 kHz, the power is 500 W to 1000 W, and the treatment duration is 30 min to 60 min.

[0018] Further, temperature control is carried out during ultrasonic disruption, and the temperature control methods include but are not limited to ice bath, etc., to avoid local overheating.

[0019] Further, the drying temperature is 50 °C to 70 °C, and it is dried until the moisture content is less than 5%.

[0020] Further, the mass ratio of the first polymer M, natural plant microparticles, wall material B to the emulsifier is 2 - 20:2 - 20:2 - 15:0.5 - 5.

[0021] Further, 2 g to 20 g of the first polymer M is added to every 100 mL of water.

[0022] Further, the organic solvent is selected from at least one of palm oil, olive oil, liquid paraffin, white oil, isopropyl myristate, ethylhexyl palmitate, cyclopentasiloxane, polydimethylsiloxane or cyclohexane.

[0023] Further, the emulsifier is selected from non - ionic emulsifiers and / or anionic emulsifiers. The non - ionic emulsifiers include but are not limited to polyether - modified silicone, polyether - modified organofluorine, alkyl polyether, Tween 40, Tween 60, Tween 80 and Span 80, etc. The anionic emulsifiers include but are not limited to sodium dodecylbenzenesulfonate and sodium dodecyl sulfate, etc.

[0024] Further, the ultrasonic frequencies used for the dual - frequency ultrasonic treatment are 21 kHz to 40 kHz and 5 kHz to 20 kHz, the power is 500 W to 1000 W, and the treatment duration is 15 min to 120 min.

[0025] Further, the duration of the first stirring is 20 min to 120 min, and the first stirring is carried out at room temperature.

[0026] Further, the duration of the second stirring is 60 min to 180 min, and the temperature of the second stirring is 30 °C to 65 °C.

[0027] Further, the mass ratio of the viscose spinning dope, slow - release porous microcapsules and cross - linker is 100:1 - 15:0.5 - 2.

[0028] Further, the crosslinking agent is selected from silane coupling agents, including but not limited to vinyltrimethoxysilane (VTMS), γ-glycidoxypropyltrimethoxysilane (KH-560), γ-aminopropyltriethoxysilane (KH-550), γ-methacryloxypropyltrimethoxysilane (KH-570), etc.

[0029] Further, the pore diameter of the wet spinning spinneret is 0.05 mm to 0.1 mm.

[0030] Further, the wet spinning process includes: conveying the spinning solution to the spinneret, extruding it into the coagulation bath, and stretching and forming.

[0031] The second aspect of the present invention provides a biomass natural plant fiber, including viscose fiber and slow-release porous microcapsules dispersed in the viscose fiber;

[0032] The slow-release porous microcapsules include a core and a wall. The core includes a porous material PM and natural plant microparticles, and some of the natural plant microparticles are located in the pores of the porous material PM; the porous material PM is obtained by dispersing a first polymer M in an organic solvent and then performing dual-frequency ultrasonic treatment. The first polymer M is selected from at least one of starch, polyurea resin, or epoxy resin; the natural plant microparticles are obtained by drying after micro-nano treatment of natural plant powder in an aqueous solution of a stabilizer by ultrasonic fragmentation. The natural plant powder includes the powder of at least one natural plant containing volatile components and having the effect of calming the nerves and helping sleep;

[0033] The wall includes a wall material B, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate, or arabic gum.

[0034] Further, the natural plant is selected from at least one of Albizia julibrissin Durazz., Lavandula angustifolia Mill., Matricaria chamomilla L., Valeriana officinalis L., Citrus aurantium L. var. amara Engl., Citrus bergamia Risso, Vetiveria zizanioides Nash., Melissa officinalis L., Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chow, Aquilaria sinensis (Lour.) Spreng., Platycodon grandiflorus (Jacq.) A. DC., Ligusticum chuanxiong Hort., Lantana camara L., Ligusticum chuanxiong Hort., Eupatorium fortunei Turcz., Perilla frutescens (L.) Britt., or Humulus lupulus L.

[0035] Further, the stabilizer is selected from polyvinylpyrrolidone, including but not limited to K12, K30, K60, and K90, etc.

[0036] Further, the mass ratio of the natural plant powder to the stabilizer is 100:0.2 to 2.

[0037] Further, the particle size of the natural plant microparticles is 20 nm to 200 nm.

[0038] Further, the mass ratio of the first polymer M, the natural plant microparticles, and the wall material B is 2 to 20:2 to 20:2 to 15.

[0039] Furthermore, the biomass natural plant fiber is prepared by wet spinning from a spinning solution.

[0040] Furthermore, the spinning solution comprises viscose spinning dope and slow-release porous microcapsules with a mass ratio of 100:1 to 15.

[0041] Furthermore, the spinning solution further comprises a crosslinking agent, and the mass ratio of the viscose spinning dope, the slow-release porous microcapsules and the crosslinking agent is 100:1 to 15:0.5 to 2.

[0042] Furthermore, the biomass natural plant fiber is prepared by the method described in the first aspect.

[0043] The third aspect of the present invention provides a textile product containing the biomass natural plant fiber prepared by the method described in the first aspect and / or the biomass natural plant fiber described in the second aspect.

[0044] Furthermore, the textile product is a home textile product, and the home textile product comprises a filler and / or a first fabric. The filler comprises the biomass natural plant fiber; the first fabric is woven from at least one fiber, and the at least one fiber comprises the biomass natural plant fiber.

[0045] Furthermore, the home textile product comprising a filler includes but is not limited to a pillow core, a quilt core, etc., and the home textile product comprising a first fabric includes but is not limited to a bed set, home clothes, etc.

[0046] As described above, the biomass natural plant fiber of the present invention, its preparation and its application in sleep-aiding home textile products have the following beneficial effects:

[0047] 1. The present invention uses a physical method to crush natural plant components, with simple steps, avoiding the cumbersome steps of chemical and biological methods and the recovery treatment of reagent waste liquid; and the present invention selects natural plants containing volatile components and having the effect of calming the nerves and aiding sleep, and can use natural plants for aromatherapy without investing a great deal of cost in refining high-purity and high-concentration plant essential oils. Therefore, the physical crushing method adopted by the present invention is not only convenient and effective, but also has the advantages of low cost, environmental friendliness, etc.

[0048] 2. The preparation method of the sustained-release porous microcapsules in the present invention actually belongs to the indirect embedding technology. After the porous material PM prepared by treating the first polymer M with dual-frequency ultrasound adsorbs natural plant particles, the wall material B is coated to form the final microcapsules. Compared with the microencapsulation using only porous materials, the added wall material in the indirect embedding method can largely limit the volatilization of natural plant components, and its oxidation stability and other indicators are also better than those of the direct embedding method. In addition, compared with the conventional wall materials with a non-porous structure, its dense structure limits its wide application. The porous material has a "sponge-like" structure, with relatively large micropores on the surface and inside, showing a relatively large specific surface area and porosity, and protecting substances sensitive to light, oxygen, and temperature, and having better adsorption capacity and stability than ordinary coating materials. The sustained-release porous microcapsules prepared in the present invention are beneficial to controlling the slow release of natural plant odor molecules and realizing their functions stably for a long time.

[0049] 3. The present invention uses wet spinning to prepare biomass natural plant fibers, solving the problems of poor adhesion fastness, insufficient wash resistance, and non-persistent special odor of natural plants in the post-treatment method, and also avoiding the problems of unstable natural plant components under heat, easy carbonization, and poor spinning performance during the melt spinning process. In the present invention, the micro-nano crushing technology is used to control the particle size and uniformity of natural plant particles, and the sustained-release porous microcapsules with good dispersibility and small particle size are prepared by the porous material PM and the wall material B. The particle size and dispersibility of the microcapsules directly affect the spinning performance; at the same time, the present invention also adds a cross-linking agent during the spinning process to ensure the compatibility of the microcapsules and the spinning dope. Through the above various ways, the spinning is promoted smoothly together. Specific Embodiments

[0050] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] In the present invention, unless otherwise specified, the term "a plurality of" means two or more.

[0052] The character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0053] The term "and / or" is an associative relationship describing an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0054] An embodiment of the present invention provides a method for preparing biomass natural plant fibers, including the following steps:

[0055] Preparation of natural plant microparticles:

[0056] Select at least one natural plant containing volatile components and having the efficacy of calming the nerves and promoting sleep. After drying, it is preliminarily pulverized to obtain natural plant powder; a stabilizer is added to water, and after mixing, the natural plant powder is added. Micro-nano treatment is carried out by ultrasonic fragmentation method, and then dried to obtain nano-scale powdered natural plant microparticles;

[0057] Preparation of sustained-release porous microcapsules:

[0058] Disperse the first polymer M in an organic solvent, and obtain a porous material PM through dual-frequency ultrasonic treatment; add natural plant microparticles and carry out the first stirring to serve as the oil phase; dissolve the wall material B and an emulsifier in water to prepare an aqueous phase, and slowly add the oil phase into the aqueous phase and carry out the second stirring; after the second stirring ends, a sustained-release porous microcapsule is prepared by spray drying; the first polymer M is selected from at least one of starch, polyurea resin or epoxy resin, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate or arabic gum;

[0059] Preparation of fibers:

[0060] Add the sustained-release porous microcapsule and a crosslinking agent to the viscose spinning dope, and after mixing, obtain a spinning solution, and prepare the biomass natural plant fiber through wet spinning.

[0061] The present invention uses a physical method to carry out fragmentation treatment on natural plant components, with simple steps, avoiding the cumbersome steps of chemical methods and biological methods and the recovery treatment of reagent waste liquids; and the present invention selects natural plants containing volatile components and having the efficacy of calming the nerves and promoting sleep, and odor therapy can be carried out using natural plants, without investing a great deal of cost to extract high-purity and high-concentration plant essential oils. Therefore, the physical fragmentation method adopted by the present invention is not only convenient and effective, but also has the advantages of low cost, environmental friendliness, etc.

[0062] The preparation method of the sustained-release porous microcapsules in the present invention actually belongs to the indirect embedding technology. After the porous material PM prepared by treating the first polymer M with dual-frequency ultrasound adsorbs natural plant particles, the wall material B is coated to form the final microcapsules. Compared with microencapsulation using only porous materials, the wall material added by the indirect embedding method can largely limit the volatilization of natural plant components, and its oxidation stability and other indicators are also better than those of the direct embedding method. In addition, compared with the conventional non-porous wall materials, their dense structure limits their wide application. The porous material has a "sponge-like" structure, with relatively large micropores on the surface and inside, showing a relatively large specific surface area and porosity, and protecting substances sensitive to light, oxygen, and temperature, and having better adsorption capacity and stability than ordinary coating materials. The sustained-release porous microcapsules prepared by the present invention are beneficial to controlling the sustained release of natural plant odor molecules and realizing their functions stably for a long time.

[0063] The present invention uses wet spinning to prepare biomass natural plant fibers, which solves the problems of poor adhesion fastness, insufficient washability, and non-persistent special odor of natural plants in the post-treatment method, and also avoids the problems of unstable natural plant components under heat, easy carbonization, and poor spinning performance during the melt spinning process. In the present invention, the micro-nano crushing technology is used to control the particle size and uniformity of natural plant particles, and the sustained-release porous microcapsules with good dispersibility and small particle size are prepared by the porous material PM and the wall material B. The particle size and dispersibility of the microcapsules directly affect the spinning performance. At the same time, the present invention also adds a cross-linking agent during the spinning process to ensure the compatibility between the microcapsules and the spinning dope. Through the above-mentioned various ways, the spinning process is promoted smoothly.

[0064] In some embodiments, the natural plants include but are not limited to Albizia julibrissin Durazz., Lavandula angustifolia Mill., Matricaria chamomilla L., Valeriana officinalis L., Citrus aurantium L. var. amara Engl., Citrus bergamia Risso, Vetiveria zizanioides Nash., Melissa officinalis L., Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chow, Aquilaria sinensis (Lour.) Spreng., Platycodon grandiflorus (Jacq.) A. DC., Ligusticum chuanxiong Hort., Lantana camara L., Ligusticum chuanxiong Hort., Eupatorium fortunei Turcz., Perilla frutescens (L.) Britt., or Humulus lupulus L., etc. The above natural plants all belong to aromatic Chinese herbal medicines. The results of modern pharmacological research show that the active ingredients of aromatic Chinese herbal medicines are mainly small molecular substances with volatility, which can be quickly absorbed by the body, have the effects of aromatic resuscitation and guiding drugs upward, and their volatile components have a dual regulatory effect on the human central nervous system. By regulating the balance of brain excitation and inhibition, the function of the central nervous system can be restored to normal, which can not only soothe the nerves and help sleep, but also refresh the mind and resuscitate. Based on traditional Chinese medicine theory, the present invention often uses Chinese herbal medicines for promoting blood circulation and regulating qi, replenishing qi and tranquilizing the mind, and sedating and hypnotizing in the treatment of insomnia. By using the volatility and special odor characteristics of aromatic Chinese herbal medicines, by preparing fibers containing aromatic Chinese herbal medicine components, and then using them as fillers and weaving them into fabrics, the aromatic Chinese herbal medicine components are evenly distributed on the products and continuously emit the special odor of Chinese herbal medicines, and are absorbed and penetrated into the human body through channels, acupoints, skin, mucous membranes and other channels, from the outside to the inside, and circulate throughout the body through qi and blood meridians, so as to relax the muscles and soothe the emotions, so as to improve the sleep quality and relieve the symptoms of insomnia.

[0065] In some embodiments, the drying methods of natural plants include but are not limited to freeze-drying, drying, etc. The drying temperature can be selected and determined within the range of 20°C to 80°C according to the types of natural plants.

[0066] In some embodiments, the stabilizer is selected from polyvinylpyrrolidone, including but not limited to K12, K30, K60, K90, etc. Using polyvinylpyrrolidone as the stabilizer and adding the stabilizer during the ultrasonic crushing process, the stabilizer will adhere to the surface of the pulverized natural plant micropowder to form natural plant microparticles, reduce the surface energy, reduce the agglomeration between natural plant microparticles, improve the dispersibility, and thus contribute to improving the particle size uniformity and dispersibility of the subsequent prepared sustained-release porous microcapsules, and further make the microcapsule particle size more uniform, with better stability and sustained-release performance. At the same time, the good dispersibility and stability of the sustained-release porous microcapsules are also necessary prerequisites to ensure the smooth subsequent spinning.

[0067] In some embodiments, the mass ratio of the natural plant powder to the stabilizer is 100:0.2 to 2. As an additive, the dosage of the stabilizer should not be too high, otherwise it will cause adverse effects instead.

[0068] In some embodiments, it is preliminarily pulverized to 100 to 200 meshes. First, pulverize the dried natural plants to the micron level, which is beneficial to shortening the processing time required for subsequent ultrasonic crushing and improving the particle size uniformity and dispersibility of natural plant microparticles.

[0069] In some embodiments, the particle size of the natural plant microparticles is 20 nm to 200 nm. Controlling the particle size of the natural plant microparticles below 200 nm is beneficial for them to enter the pores of the porous material PM and is also more conducive to the volatilization of natural plant components to exert the effect of soothing the nerves and helping sleep; at the same time, the particle size of the natural plant microparticles should not be too small, and it is preferably controlled within the range of 20 nm to 200 nm, because the smaller the particle size, the longer the ultrasonic crushing processing time required, and too long ultrasonic time will cause adverse effects instead.

[0070] In some embodiments, the ultrasonic frequency used for ultrasonic disruption is 20 kHz to 40 kHz, the power is 500 W to 1000 W, and the treatment duration is 30 min to 60 min. If the ultrasonic frequency is too low, the energy is insufficient, making it difficult to effectively break the cellulose and lignin structures of the natural plant cell wall, resulting in a low release rate of active ingredients. Moreover, the cavitation effect is weak, unable to fully disperse the large particles in the dried powder, easily forming coarse particle residues, leading to uneven particle sizes. Additionally, it is necessary to extend the ultrasonic time to make up for the insufficient low-frequency energy, which may cause the sample to thermally denature due to long-term mechanical vibration. If the ultrasonic frequency is too high, it may cause excessive fragmentation of the plant cell wall, resulting in the degradation of thermosensitive active ingredients (such as flavonoids, volatile oils, etc.) due to local high temperatures (generated by the cavitation effect). It will also lead to insufficient fragmentation in local areas, resulting in particle aggregation or uneven particle size distribution. If the ultrasonic power is too low, it will cause insufficient comminution and uneven particle distribution. If the ultrasonic power is too high, it will lead to over-comminution, resulting in powder caking or decreased fluidity, and will also cause local overheating and damage to thermosensitive active ingredients (such as flavonoids, volatile oils, etc.). If the ultrasonic duration is too short, it will also cause insufficient comminution and uneven particle distribution. If the ultrasonic duration is too long, it will lead to over-comminution and damage to active ingredients.

[0071] In some embodiments, temperature control is carried out during ultrasonic disruption. The temperature control methods include but are not limited to ice baths, etc., to avoid local overheating and damage or inactivation of natural plant components.

[0072] In some embodiments, the drying temperature is 50 °C to 70 °C, and drying is carried out until the moisture content is less than 5%. The purpose of drying is to remove moisture, and the temperature should not be too high, otherwise it will cause negative effects, such as damaging natural plant components.

[0073] In some embodiments, the mass ratio of the first polymer M, natural plant microparticles, wall material B to the emulsifier is 2 to 20:2 to 20:2 to 15:0.5 to 5.

[0074] In some embodiments, 2 g to 20 g of the first polymer M is added to every 100 mL of water.

[0075] In some embodiments, the organic solvents include but are not limited to palm oil, olive oil, liquid paraffin, white oil, isopropyl myristate, ethylhexyl palmitate, cyclopentasiloxane, polydimethylsiloxane, cyclohexane, etc.

[0076] In some embodiments, the emulsifier is selected from non-ionic emulsifiers and / or anionic emulsifiers. The non-ionic emulsifiers include but are not limited to polyether-modified silicone, polyether-modified organofluorine, alkyl polyether, Tween 40, Tween 60, Tween 80, Span 80, etc. The anionic emulsifiers include but are not limited to sodium dodecylbenzenesulfonate and sodium dodecyl sulfate, etc.

[0077] In some embodiments, the ultrasonic frequencies used in the dual-frequency ultrasonic treatment are 21 kHz to 40 kHz and 5 kHz to 20 kHz, the power is 500 W to 1000 W, and the treatment duration is 15 min to 120 min. Ultrasonic waves cause the appearance of bubbles in the liquid. Under continuous acoustic stimulation, the volume of the bubbles expands until they burst, and the shock waves generated by the bursting cause holes to appear on the surface of the surrounding first polymer M particles, turning them into porous materials PM. Dual-frequency ultrasonic waves can significantly improve the cavitation effect to increase the sonochemical yield. The strong mechanical force, powerful shock waves in the solution, and rapid jetting result in the porous structure. The high-low dual-frequency (21 kHz to 40 kHz + 5 kHz to 20 kHz) ultrasonic waves make the first polymer M particles smaller and have more depressions on the surface, which is better than the effect of single-frequency ultrasonic waves. The possible reasons are as follows: Dual-frequency ultrasonic waves, that is, two beams of ultrasonic waves propagating in the liquid simultaneously, can increase the vibration amplitude and generate more ultrasonic cavitation phenomena in the same time. Therefore, the interfacial area of mass transfer increases, and more damage is formed on the particle surface, indicating that dual-frequency ultrasonic waves are more effective in modifying the first polymer M.

[0078] In some embodiments, the duration of the first stirring is 20 min to 120 min, and the first stirring is carried out at room temperature.

[0079] In some embodiments, the duration of the second stirring is 60 min to 180 min, and the temperature of the second stirring is 30 °C to 65 °C.

[0080] In some embodiments, the mass ratio of the viscose spinning dope, the sustained-release porous microcapsules, and the cross-linking agent is 100:1 to 15:0.5 to 2.

[0081] In some embodiments, the cross-linking agent is selected from silane coupling agents, and the silane coupling agents include but are not limited to vinyltrimethoxysilane (VTMS), γ-glycidoxypropyltrimethoxysilane (KH-560), γ-aminopropyltriethoxysilane (KH-550), and γ-methacryloxypropyltrimethoxysilane (KH-570), etc.

[0082] In some embodiments, the aperture of the wet spinning spinneret is 0.05 mm to 0.1 mm.

[0083] In some embodiments, the wet spinning process includes: conveying the spinning solution to the spinneret, extruding it into the coagulation bath, and stretching and forming.

[0084] Based on the above concept, another embodiment of the present invention provides a biomass natural plant fiber, including viscose fibers and sustained-release porous microcapsules dispersed in the viscose fibers;

[0085] The sustained-release porous microcapsules include a core and a wall. The core includes a porous material PM and natural plant microparticles. Part of the natural plant microparticles are located in the pores of the porous material PM; another part of the natural plant microparticles are mixed and doped with the porous material PM, and / or adhered to the surface of the porous material PM. The porous material PM is obtained by dispersing a first polymer M in an organic solvent and then performing dual-frequency ultrasonic treatment. The first polymer M is selected from at least one of starch, polyurea resin, or epoxy resin. The natural plant microparticles are obtained by drying after micro-nano treatment of natural plant powder in an aqueous solution of a stabilizer by ultrasonic fragmentation. The natural plant powder includes the powder of at least one natural plant containing volatile components and having the effect of soothing the nerves and helping sleep.

[0086] The wall includes a wall material B, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate, or gum arabic.

[0087] In some embodiments, the biomass natural plant fiber is prepared by wet spinning of a spinning solution.

[0088] In some embodiments, the spinning solution includes a viscose spinning stock solution and the sustained-release porous microcapsules in a mass ratio of 100:1 to 15.

[0089] In some embodiments, the spinning solution further includes a crosslinking agent, and the mass ratio of the viscose spinning stock solution, the sustained-release porous microcapsules, and the crosslinking agent is 100:1 to 15:0.5 to 2.

[0090] In some embodiments, the biomass natural plant fiber is prepared by the method described above.

[0091] It should be noted that the biomass natural plant fiber provided by the above embodiments and the preparation method of the biomass natural plant fiber provided by the above embodiments belong to the same concept. The details and technical principles of each embodiment have been described in detail in the method embodiments and will not be repeated here.

[0092] Another embodiment of the present invention provides a textile product containing the biomass natural plant fiber prepared by the method described above and / or the biomass natural plant fiber described above.

[0093] In some embodiments, the textile product is a home textile product. The home textile product includes a filler and / or a first fabric. The filler includes the biomass natural plant fiber. The first fabric is woven from at least one fiber, and the at least one fiber includes the biomass natural plant fiber.

[0094] In some embodiments, the home textile products including fillers include, but are not limited to, pillow cores, quilt cores, etc., and the home textile products including the first fabric include, but are not limited to, bed sets, home clothes, etc.

[0095] The biomass natural plant fibers provided by the above embodiments can be used as fillers for pillow cores, quilt cores, etc., or can be woven into fabrics alone or together with other fibers and used for home textile bed sets, home clothes, etc. By continuously and slowly emitting a faint natural plant aroma and small molecule substances during the human sleep process, it plays a role in calming the nerves and improving sleep quality.

[0096] The following specifically lists embodiments to illustrate the present invention in detail. It should also be understood that the following embodiments are only used to specifically illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention. The specific process parameters and the like in the following examples are also only an example within a suitable range, that is, those skilled in the art can make selections within a suitable range through the description in this article, rather than being limited to the specific values in the following examples.

[0097] Example 1

[0098] This embodiment provides a biomass natural plant fiber, and its preparation method is as follows:

[0099] 1. Preparation of natural plant microparticles:

[0100] Select acacia flowers, lavender, and chamomile. After cleaning them, according to the mass ratio of 1:1:1, freeze-dry and preliminarily pulverize them to 100 mesh to 200 mesh to obtain natural plant powder; add a stabilizer (polyvinylpyrrolidone K30) to water, mix well to prepare a 10% polyvinylpyrrolidone K30 aqueous solution (that is, 10 g of polyvinylpyrrolidone K30 per 100 mL of water), and then add the natural plant powder. The mass ratio of the natural plant powder to the stabilizer (polyvinylpyrrolidone K30) is 100:0.5. Perform micro-nano treatment by ultrasonic fragmentation method, set the ultrasonic frequency to 25 kHz, the power to 800 W, and the treatment duration to 45 min. At the same time, control the temperature by ice bath to avoid local overheating; then dry at 60 °C until the moisture content is less than 5% to obtain nano-scale powdery natural plant microparticles.

[0101] 2. Preparation of slow-release porous microcapsules:

[0102] Weigh 20 g of polyurea resin and add it to 100 mL of palm oil, disperse it evenly, and obtain porous polyurea resin through dual-frequency ultrasonic treatment with a frequency of 20 kHz + 25 kHz and a power of 800 W. Then add 20 g of natural plant particles, stir with a magnetic stirrer for 120 min, and wait for the porous polyurea resin to adsorb the natural plant particles as fully as possible to serve as the oil phase.

[0103] Add 15 g of wall material β-cyclodextrin and 1 g of emulsifier (the emulsifier is a compound of Span 80 and Tween 40 used in a 1:1 ratio) to 500 mL of water in sequence to prepare the aqueous phase; slowly drop the oil phase into the aqueous phase and stir with a magnetic stirrer for 120 min at a stirring temperature of 55 °C, and then spray dry to obtain the sustained-release porous microcapsules.

[0104] 3. Preparation of fibers:

[0105] Add the sustained-release porous microcapsules and crosslinking agent (silane coupling agent KH-550) to the viscose spinning dope according to a mass ratio of 100:10:1, mix well to obtain the spinning solution; add the spinning solution to a wet spinning machine, let it stand for defoaming, and then transport the spinning solution to a spinneret (pore diameter 0.05 mm - 0.1 mm) through a metering pump, extrude it into a coagulation bath, and stretch and form to obtain the biomass natural plant fiber.

[0106] Example 2

[0107] This example provides a biomass natural plant fiber, and its preparation method is as follows:

[0108] 1. Preparation of natural plant particles:

[0109] Select Albizia julibrissin Durazz., lavender, and chamomile, clean them, and freeze-dry and preliminarily crush them to 100 - 200 mesh according to a mass ratio of 1:1:1 to obtain natural plant powder; add a stabilizer (polyvinylpyrrolidone K30) to water, mix well to prepare a 10% aqueous solution of polyvinylpyrrolidone K30 (that is, 10 g of polyvinylpyrrolidone K30 per 100 mL of water), and then add the natural plant powder. The mass ratio of the natural plant powder to the stabilizer (polyvinylpyrrolidone K30) is 100:1, and perform micro-nano treatment by ultrasonic fragmentation method, set the ultrasonic frequency to 20 kHz, the power to 1000 W, and the treatment duration to 60 min, and control the temperature with an ice bath to avoid local overheating; then dry at 50 °C until the moisture content is less than 5% to obtain nano-scale powdered natural plant particles.

[0110] 2. Preparation of sustained-release porous microcapsules:

[0111] Weigh 10 g of starch and add it to 100 mL of liquid paraffin, disperse evenly, and obtain porous starch through dual-frequency ultrasonic treatment with a frequency of 10 kHz + 30 kHz and a power of 1000 W. Then add 10 g of natural plant microparticles, stir with a magnetic stirrer for 120 min, and wait for the porous starch to adsorb the natural plant microparticles as fully as possible to serve as the oil phase.

[0112] Continue to add 1 g of emulsifier (the emulsifier is a 1:1 compound of Span 80 and Tween 40) to the above solution, and add 5 g of wall material maltodextrin, 5 g of sodium alginate, and 1 g of emulsifier (the emulsifier is a 1:1 compound of Span 80 and Tween 40) to 500 mL of water in sequence to prepare the aqueous phase; slowly drip the oil phase into the aqueous phase and stir with a magnetic stirrer for 180 min at a stirring temperature of 65 °C, and then spray dry to obtain the sustained-release porous microcapsules.

[0113] 3. Preparation of fibers:

[0114] Add the sustained-release porous microcapsules and crosslinking agent (silane coupling agent KH-550) to the viscose spinning dope according to a mass ratio of 100:1:0.5, mix evenly to obtain the spinning solution; add the spinning solution to a wet spinning machine, stand for defoaming, and then transport the spinning solution to a spinneret (pore diameter 0.05 mm - 0.1 mm) through a metering pump, extrude it into a coagulation bath, and stretch and form to obtain the biomass natural plant fiber.

[0115] Example 3

[0116] This example provides a biomass natural plant fiber, and its preparation method is as follows:

[0117] 1. Preparation of natural plant microparticles:

[0118] Select Albizia julibrissin Durazz., lavender, and chamomile, clean them, and freeze-dry them according to a mass ratio of 1:1:1, and then preliminarily pulverize them to 100 - 200 mesh to obtain natural plant powder; add the stabilizer (polyvinylpyrrolidone K30) to water, mix evenly to prepare a 10% polyvinylpyrrolidone K30 aqueous solution (that is, 10 g of polyvinylpyrrolidone K30 per 100 mL of water), and then add the natural plant powder. The mass ratio of the natural plant powder to the stabilizer (polyvinylpyrrolidone K30) is 100:0.2, and perform micro-nano treatment by ultrasonic fragmentation method. Set the ultrasonic frequency to 40 kHz, the power to 500 W, and the treatment duration to 30 min, and control the temperature with an ice bath to avoid local overheating; then dry at 70 °C until the moisture content is less than 5% to obtain nano-scale powdered natural plant microparticles.

[0119] 2. Preparation of sustained-release porous microcapsules:

[0120] Weigh 2 g of epoxy resin and add it to 100 mL of polydimethylsiloxane. Through dual-frequency ultrasonic treatment with a frequency of 5 kHz + 40 kHz and a power of 500 W, porous epoxy resin is obtained. Then add 10 g of natural plant particles and stir with a magnetic stirrer for 60 min. Wait for the porous epoxy resin to adsorb the natural plant particles as fully as possible to serve as the oil phase.

[0121] Continue to add 1 g of emulsifier (the emulsifier is a 1:1 compound of Span 80 and Tween 40) to the above solution, and add 1 g of wall material sodium alginate, 1 g of arabic gum, and 1 g of emulsifier (the emulsifier is a 1:1 compound of Span 80 and Tween 40) to 500 mL of water in sequence to prepare the aqueous phase; slowly drip the oil phase into the aqueous phase and stir with a magnetic stirrer for 60 min at a stirring temperature of 30 °C. Then spray dry to obtain the sustained-release porous microcapsules.

[0122] 3. Preparation of fibers:

[0123] Add the sustained-release porous microcapsules and cross-linking agent (silane coupling agent KH-550) to the viscose spinning dope according to a mass ratio of 100:15:2, mix well to obtain the spinning solution; add the spinning solution to the wet spinning machine, let it stand for degassing, and then transport the spinning solution to the spinneret (pore diameter 0.05 mm - 0.1 mm) through a metering pump, extrude it into the coagulation bath, and stretch and form to obtain the biomass natural plant fiber.

[0124] Comparative Example 1

[0125] This comparative example provides a biomass natural plant fiber, and the difference in its preparation method from that of Example 1 is only:

[0126] The preparation of the fiber uses melt spinning, and the melt spinning process is as follows:

[0127] Mix conventional polyester chips, sustained-release porous microcapsules, and cross-linking agent in a high-speed mixer according to a mass ratio of 100:1:0.5, add them to a screw spinning machine for melt spinning, set the spinning temperature at 280 °C, pull out the nascent fiber through the melt spinning machine, and then obtain the biomass natural plant fiber through cooling and drawing.

[0128] Comparative Example 2

[0129] This comparative example provides a biomass natural plant fiber, and the difference in its preparation method from that of Example 1 is only:

[0130] First, add the viscose spinning dope into a wet spinning machine. After standing for degassing, the spinning solution is transported to a spinneret (with a pore diameter of 0.05 mm to 0.1 mm) through a metering pump, extruded into a coagulation bath, and stretched to form viscose fibers. Then, the viscose fibers are placed in a finishing solution containing slow-release porous microcapsules for post-treatment. The concentration of slow-release porous microcapsules in the finishing solution is 4%, the fiber liquid uptake rate is 100%, the drying temperature is 105 °C, and the drying time is 2 min.

[0131] Comparative Example 3

[0132] This comparative example provides a biomass natural plant fiber, and its preparation method is as follows:

[0133] 1. Preparation of natural plant microparticles:

[0134] Select Albizia julibrissin Durazz., lavender, and chamomile. After cleaning them, freeze-dry them and preliminarily crush them to 100 to 200 mesh according to the mass ratio of 1:1:1 to obtain natural plant powder. Add a stabilizer (polyvinylpyrrolidone K30) into water, mix well to prepare a 10% polyvinylpyrrolidone K30 aqueous solution (that is, 10 g of polyvinylpyrrolidone K30 is contained in every 100 mL of water), and then add the natural plant powder. The mass ratio of the natural plant powder to the stabilizer (polyvinylpyrrolidone K30) is 100:0.5. Perform micro-nano treatment by ultrasonic fragmentation method, set the ultrasonic frequency to 25 kHz, the power to 800 W, and the treatment duration to 45 min. At the same time, control the temperature by ice bath to avoid local overheating. Then dry it at 60 °C until the moisture content is less than 5% to obtain nano-scale powdery natural plant microparticles.

[0135] 2. Preparation of microcapsules:

[0136] Weigh 20 g of polyurea resin and add it to 100 mL of palm oil, stir evenly, then add 20 g of natural plant microparticles, and stir with a magnetic stirrer for 120 min as the oil phase.

[0137] Continue to add 1 g of emulsifier (the emulsifier is a compound of Span 80 and Tween 40 used in a ratio of 1:1) to the above solution, and add 15 g of wall material β-cyclodextrin and 1 g of emulsifier (the emulsifier is a compound of Span 80 and Tween 40 used in a ratio of 1:1) to 500 mL of water in sequence to prepare an aqueous phase. Slowly drop the oil phase into the aqueous phase and stir with a magnetic stirrer for 120 min. The stirring temperature is 55 °C, and then spray dry to obtain microcapsules.

[0138] 3. Preparation of fibers:

[0139] Microcapsules and a crosslinking agent (silane coupling agent KH-550) were added to the viscose spinning dope according to a mass ratio of 100:10:1, and after mixing evenly, a spinning solution was obtained; the spinning solution was added to a wet spinning machine, and after standing and degassing, the spinning solution was conveyed to a spinneret (aperture 0.05 mm - 0.1 mm) through a metering pump, extruded into a coagulation bath, and stretched and formed to obtain biomass natural plant fibers.

[0140] The biomass natural plant fibers of Example 1, Comparative Examples 1 - 3, and ordinary viscose fibers were respectively woven into fabrics, and then made into pillowcases, which were numbered 1 - 5 in sequence; Volunteers were recruited for a 2-month sleep test, and the screening criteria for volunteers were as follows: 1) No sleep aid drugs were used within the past month; 2) Good acceptance of natural plant odors; 3) Aged 22 - 40 years. There were 20 volunteers in total, including 10 females and 10 males, with an average age of 28.5 years. They were randomly divided into 5 groups, with 4 people in each group, and 2 males and 2 females in each group. In the first month, the 5 groups of subjects used pillowcase 5 to sleep every day as a blank control; in the second month, the 5 groups of subjects used pillowcases 1 - 5 to sleep every day respectively; The sleep states of the subjects were continuously monitored using a polysomnograph, and objective indicators such as sleep onset time, deep sleep duration, and number of turns were compared for the use of pillowcases 1 - 5. The test results are shown in Table 1; After the pillowcases were washed 20 times, the sleep test was carried out again, and the test results are shown in Table 2.

[0141] Table 1 Sleep test results before washing (i.e., 0 times of washing)

[0142] Pillowcase Average sleep onset time Average deep sleep duration Average number of turns 1 9.5min 6.0h 3.0 2 26.4min 3.9h 7.5 3 11.8min 5.5h 3.8 4 21.6min 4.8h 6.0 5 25.3min 4.1h 7.2

[0143] Table 2 Sleep test results after 20 times of washing

[0144] Pillowcase Average sleep onset time Average deep sleep duration Average number of turns 1 10.3min 5.8h 3.0 2 26.8min 3.8h 7.8 3 25.8min 4.2h 7.0 4 23.5min 4.6h 6.4 5 26.1min 4.0h 7.4

[0145] As can be seen from Table 1, compared with the pillowcase made of ordinary viscose fiber (i.e., pillowcase 5), for the pillowcase made of the biomass natural herb fiber of Example 1 (i.e., pillowcase 1), the average sleep onset time of the subjects was significantly shortened, the average deep sleep duration was significantly prolonged, and the average number of turns was significantly reduced, indicating a better effect of calming the nerves and promoting sleep. Moreover, the effect of calming the nerves and promoting sleep of using pillowcase 1 was better than that of using pillowcases 2 and 3, indicating that compared with melt spinning and post-finishing, using wet spinning to prepare fibers has a better protection effect on natural plant components and a higher bonding strength. In addition, the sleep-promoting effect of using pillowcase 2 was slightly worse than that of using pillowcase 5, probably because a large amount of effective natural plant components were destroyed during the high-temperature spinning process and could not play the role of calming the nerves and promoting sleep.

[0146] As can be seen from Table 1 and Table 2, before washing and after 20 washes, the changes in the average sleep onset time, average deep sleep duration, and average number of body turns when using Pillowcase 1 are not significant. This shows that after multiple washes, Pillowcase 1 still has a good effect of calming the nerves and promoting sleep, with a lasting calming and sleep-promoting effect and good water wash resistance. After 20 washes, the average sleep onset time, average deep sleep duration, and average number of body turns when using Pillowcase 3 and 4 are similar to those when using Pillowcase 5. This indicates that compared with wet spinning, the post-treatment method has the problems of non-lasting calming and sleep-promoting effect and poor water wash resistance. It also shows that porous materials are more conducive to controlling the slow release of natural plant odor molecules and achieving its calming and sleep-promoting function stably for a long time.

[0147] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A preparation method of biomass natural plant fibers, characterized in that, It includes the following steps: Preparation of natural plant microparticles: Select at least one natural plant containing volatile components and having the efficacy of calming the nerves and promoting sleep. After drying, it is preliminarily pulverized to obtain natural plant powder; a stabilizer is added to water, and after mixing, the natural plant powder is added. Micro-nano treatment is carried out by ultrasonic fragmentation method, and then dried to obtain nano-scale powdered natural plant microparticles; Preparation of sustained-release porous microcapsules: Disperse the first polymer M in an organic solvent, and obtain a porous material PM by dual-frequency ultrasonic treatment; add natural plant microparticles and carry out the first stirring to obtain an oil phase; dissolve the wall material B and an emulsifier in water to prepare an aqueous phase, add the oil phase to the aqueous phase, and carry out the second stirring; after the second stirring is completed, the sustained-release porous microcapsules are prepared by spray drying; the first polymer M is selected from at least one of starch, polyurea resin or epoxy resin, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate or gum arabic; Preparation of fibers: Add the sustained-release porous microcapsules and a crosslinking agent to the viscose spinning dope, mix evenly to obtain a spinning solution, and prepare the biomass natural plant fiber by wet spinning.

2. The preparation method according to claim 1, characterized in that: The natural plant is selected from at least one of Albizia julibrissin Durazz., Lavandula angustifolia Mill., Matricaria chamomilla L., Valeriana officinalis L., Citrus aurantium L. var. amara Engl., Citrus bergamia Risso, Vetiveria zizanioides Nash., Melissa officinalis L., Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chow, Aquilaria sinensis (Lour.) Spreng., Platycodon grandiflorus (Jacq.) A. DC., Ligusticum chuanxiong Hort., Lantana camara L., Ligusticum chuanxiong Hort., Eupatorium fortunei Turcz., Perilla frutescens (L.) Britt., or Humulus lupulus L.; And / or, the stabilizer is selected from polyvinylpyrrolidone; And / or, the mass ratio of the natural plant powder to the stabilizer is 100:0.2 - 2; And / or, it is preliminarily pulverized to 100 - 200 meshes; And / or, the particle size of the natural plant microparticles is 20nm - 200nm; And / or, the ultrasonic frequency used during ultrasonic fragmentation is 20kHz - 40kHz, the power is 500W - 1000W, and the treatment duration is 30min - 60min; And / or, temperature control is carried out during ultrasonic fragmentation; And / or, the drying temperature is 50°C - 70°C.

3. The preparation method according to claim 1, wherein: The mass ratio of the first polymer M, natural plant microparticles, wall material B to the emulsifier is 2 - 20:2 - 20:2 - 15:0.5 - 5; And / or, 2g - 20g of the first polymer M is added to every 100mL of water; And / or, the organic solvent is selected from at least one of palm oil, olive oil, liquid paraffin, white oil, isopropyl myristate, ethylhexyl palmitate, cyclopentasiloxane, polydimethylsiloxane or cyclohexane; And / or, the emulsifier is selected from non-ionic emulsifiers and / or anionic emulsifiers; And / or, the ultrasonic frequencies used for the dual-frequency ultrasonic treatment are 21kHz - 40kHz and 5kHz - 20kHz, the power is 500W - 1000W, and the treatment duration is 15min - 120min; And / or, the duration of the first stirring is 20min - 120min; And / or, the duration of the second stirring is 60min - 180min, and the temperature of the second stirring is 30°C - 65°C.

4. The preparation method according to any one of claims 1 to 3, characterized in that: The mass ratio of the viscose spinning dope, sustained-release porous microcapsules and crosslinking agent is 100:1 - 15:0.5 - 2; And / or, the crosslinking agent is selected from silane coupling agents; And / or, the aperture of the wet spinning spinneret is 0.05 mm to 0.1 mm; And / or, the wet spinning process includes: conveying the spinning solution to the spinneret, extruding it into the coagulation bath, and stretching and forming.

5. A biomass natural plant fiber, characterized in that: It includes viscose fibers and slow-release porous microcapsules dispersed in the viscose fibers; The slow-release porous microcapsules include a core and a wall. The core includes a porous material PM and natural plant microparticles, and some of the natural plant microparticles are located in the pores of the porous material PM; the porous material PM is obtained by dispersing a first polymer M in an organic solvent and then performing dual-frequency ultrasonic treatment. The first polymer M is selected from at least one of starch, polyurea resin, or epoxy resin; the natural plant microparticles are obtained by drying after micro-nano treatment of natural plant powder in an aqueous solution of a stabilizer by ultrasonic fragmentation. The natural plant powder includes the powder of at least one natural plant containing volatile components and having the effect of calming the nerves and promoting sleep; The wall includes a wall material B, and the wall material B is selected from at least one of maltodextrin, β-cyclodextrin, sodium alginate, or gum arabic; 6. The biomass natural plant fiber according to claim 5, characterized in that: The natural plant is selected from at least one of Albizia julibrissin Durazz., Lavandula angustifolia Mill., Matricaria chamomilla L., Valeriana officinalis L., Citrus aurantium L. var. amara Engl., Citrus bergamia Risso, Vetiveria zizanioides Nash., Melissa officinalis L., Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chow, Aquilaria sinensis (Lour.) Spreng., Platycodon grandiflorus (Jacq.) A. DC., Ligusticum chuanxiong Hort., Lantana camara L., Ligusticum chuanxiong Hort., Eupatorium fortunei Turcz., Perilla frutescens (L.) Britt., or Humulus lupulus L.; And / or, the stabilizer is selected from polyvinylpyrrolidone; And / or, the mass ratio of the natural plant powder to the stabilizer is 100:0.2 to 2; And / or, the particle size of the natural plant microparticles is 20 nm to 200 nm; And / or, the mass ratio of the first polymer M, natural plant microparticles, and wall material B is 2 to 20:2 to 20:2 to 15; The biomass natural plant fiber is prepared by wet spinning from a spinning solution.

7. The biomass natural plant fiber according to claim 5, characterized in that: The biomass natural plant fiber is prepared by wet spinning from a spinning solution, and the spinning solution includes a viscose spinning dope and slow-release porous microcapsules with a mass ratio of 100:1 to 15.

8. The biomass natural plant fiber according to any one of claims 5 to 7, characterized in that: The biomass natural plant fiber is prepared by the method according to any one of claims 1 to 4.

9. A textile, characterized in that: It contains the biomass natural plant fiber prepared by the method according to any one of claims 1 to 4 and / or the biomass natural plant fiber according to any one of claims 5 to 8.

10. The textile according to claim 9, characterized in that: The textile is a home textile product. The home textile product includes a filler and / or a first fabric. The filler includes the biomass natural plant fiber; the first fabric is woven from at least one fiber, and the at least one fiber includes the biomass natural plant fiber.