CN115467156A - Test tube brush-shaped plant fiber and preparation method and application thereof - Google Patents
Test tube brush-shaped plant fiber and preparation method and application thereof Download PDFInfo
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- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic System
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/07—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M11/11—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with halogen acids or salts thereof
- D06M11/13—Ammonium halides or halides of elements of Groups 1 or 11 of the Periodic System
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/07—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M11/30—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with oxides of halogens, oxyacids of halogens or their salts, e.g. with perchlorates
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- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/388—Amine oxides
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
Abstract
The invention relates to the technical field of plant fiber processing, in particular to a test tube brush-shaped plant fiber and a preparation method and application thereof. According to the invention, the natural multi-level structure of the micron-sized plant fiber is utilized, the cellulose nanofiber is stripped from the surface part of the plant fiber by a TEMPO catalytic oxidation method, the surface appearance of the plant fiber is regulated and controlled on a nanoscale to obtain the test tube brush-shaped plant fiber, and the test tube brush-shaped plant fiber has higher specific surface area and abundant carboxyl and aldehyde functional groups, and can be better applied to the preparation of composite materials, cellulose materials, functional fabrics and oil-water separation materials. The method for modifying the plant fiber does not need separation operations such as centrifugation and dialysis, does not need to design a binding site, has simple operation, controllable conditions, mild reaction and less energy consumption, can completely degrade the obtained product, is convenient to store, and has application and popularization values.
Description
Technical Field
The invention relates to the technical field of plant fiber processing, in particular to a test tube brush-shaped plant fiber and a preparation method and application thereof.
Background
Renewable and degradable cellulose is the most abundant natural polymer in nature, and the development of cellulose-based materials is helpful for coping with energy crisis and solving the problems of greenhouse effect, white pollution and the like. The main component of natural plant fiber is cellulose, and the source of the cellulose is mainly divided into wood, bast, leaf, fruit, seed, grass and the like. The plant fiber has the advantages of degradability, low cost, low density, high specific strength, high specific stiffness, low thermal expansion coefficient, small abrasion to production machines and the like, and can be used for manufacturing fabrics and reinforcing polymers. In order to expand the application field of the plant fiber, the surface modification of the plant fiber is often needed. The commonly used surface modification methods include chemical modification methods (such as graft modification) and physical modification methods (such as sizing), which mainly change the chemical structure of the fiber surface, and some can also change the morphology of the fiber surface on a micrometer scale, but generally the regulation and control of the morphology of the fiber surface are limited, and the wide application of the plant fiber is limited.
In order to better control the surface topography of plant fibers, researchers have attempted to modify their surfaces with nanoparticles. Sarker et al enhanced the tensile strength and Young' S modulus of the Fiber by coating Graphene oxide or Graphene sheets on the surface of jute Fiber, while enhancing the interfacial shear strength with the epoxy matrix [ Forkan S, nazmul K, shaila A, et al, high-Performance Graphene-Based Natural Fiber Composites [ J ]. ACS applied materials and interfaces, 2018, 10: 34502-34512 ]. Tzounins et al modify alkali-treated jute fibers by hydrogen bond interaction with acidified carbon nanotubes, reduce the hydrophilicity of the fibers, form a "mechanical interlock" with a natural rubber matrix, and significantly enhance the interfacial adhesion strength of composite Materials [ Tzounins L, debnath S, rooj S, et al. High performance raw rubber composites with a High performance reinforcement structure [ J ]. Materials and Design, 2014, 58: 1-11 ]. Han et al graft polyhedral Polysilsesquioxane (POSS) nanoparticles onto the surface of cotton cloth, which can be used for oil and water separation [ Deng Y, han D, deng Y, et al, surface one-step preparation of robust hydrophilic coating fabrics by means of Chemical bonding synthetic polymeric nanoparticles for aqueous coating materials oil/water separation-scientific direct [ J ] Chemical Engineering Journal, 379 (C): 122391-122391 ] ] [ Zhou D L, yang D, han D, surface of hydrophilic and inorganic porous membranes for surface and water treatment of surface coating fabrics, J.898. Most of the nanoparticles selected in the researches are harsh in preparation conditions and difficult to degrade, so that the modified plant fiber material cannot be completely degraded. Yi et al successfully covered a layer of bacterial cellulose with a net structure on the surface of wood powder by culturing acetobacter xylinum on the wood powder. Although the method can change the surface morphology of the fiber on a nanometer scale and simultaneously maintain the advantage of the degradability of the plant fiber material, the process requirement is strict and is not beneficial to industrial application and popularization [ aachen, forest dawn, old dawn, and the like. Plant fibers are different from inorganic fibers, and are composed of a large number of base fibrils arranged in a specific mode, and nanoscale cellulose can be obtained through mechanical or chemical treatment by adopting a top-down strategy. Nanocellulose has the advantages of sustainability, excellent mechanical properties, low density, easy modification and the like, and thus, nanocellulose becomes a hot point of current research. However, the size of the dispersion is in the nanometer scale, the preparation and separation processes are complex, the viscosity of the dispersion is high, and the storage conditions are harsh, so the use of the dispersion is limited to a certain extent.
Therefore, a plant fiber modification method which can regulate and control the surface appearance of plant fibers on a nanometer scale and maintain the advantage of degradability of the plant fibers and has low process requirements is developed, and the method has important value on the flexible and wide application of the plant fibers.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a test tube brush-shaped plant fiber, a preparation method and application thereof.
The technical scheme of the invention is as follows:
a preparation method of a test tube brush-shaped plant fiber comprises the following steps:
(1) Dispersing plant fibers in a NaOH solution with the mass fraction of 0.1-10% according to the solid-to-liquid ratio of 1 (1-200), reacting at-10-90 ℃ for 0.5-72 h, washing and drying to obtain alkali-treated plant fibers;
(2) And (2) adding water into the alkali-treated plant fiber obtained in the step (1) for dispersing, adjusting the pH value, and reacting for 1-120 h at 20-100 ℃ by using a TEMPO oxidation system to oxidize and modify the alkali-treated plant fiber to obtain the test tube brush-shaped plant fiber.
Further, the plant fiber in the step (1) is any one of bast fiber, leaf fiber, fruit fiber and seed fiber obtained from natural plants, and is in the form of any one of single fiber, fiber bundle and fiber fabric.
Further, in the step (2), 0.01 to 1L of deionized water is used for dispersing per gram of alkali-treated plant fiber; the pH adjustment is specifically to adjust the pH to 2.6-13.0 by using a buffer solution, adjust the pH to 2.6-13.0 by using an acid or an alkali, or adjust the pH to 2.6-13.0 by using the buffer solution and the acid or the alkali.
Preferably, the buffer is any one of an acetate buffer, a phosphate buffer, and a sodium carbonate-sodium bicarbonate buffer.
Further, the TEMPO oxidation system in the step (2) is TEMPO/NaClO 2 System or TEMPO/NaBr/NaClO system.
Preferably, the TEMPO/NaClO 2 The system is used under the condition that each gram of alkali treated plant fiber needs to be added with 0.1-10 mmol of TEMPO, 0.5-50 mmol of NaClO and 5-500 mmol of NaClO 2 (ii) a The TEMPO/NaBr/NaClO system is used under the condition that 0.1-10 mmol of TEMPO, 0.5-50 mmol of NaBr and 5-500 mmol of NaClO are added to each gram of alkali-treated plant fibers.
The invention also comprises the test tube brush-shaped plant fiber prepared by the method.
The invention also comprises the application of the test tube brush-shaped plant fiber in the preparation of composite materials, cellulose materials, functional fabrics and oil-water separation materials.
The invention has the beneficial effects that:
(1) According to the method, the natural multi-level structure of the micron-sized plant fibers is utilized, the cellulose nanofibers are stripped from the surface parts of the plant fibers through a TEMPO catalytic oxidation method, the surface appearance of the plant fibers is regulated and controlled on a nanoscale, separation operations such as centrifugation and dialysis required in the preparation process of the nanofibers are not required in the modification process, binding sites of the micron-sized plant fibers and the nanometer fibers are not required to be designed, the method is simple to operate, conditions are controllable, the reaction is mild, the energy consumption is low, modification of the nanometer particles is not required, the obtained test tube brush-shaped plant fibers can be completely degraded and are convenient to store, and the method is suitable for modification of single plant fibers, plant fiber bundles or plant fiber fabrics.
(2) The test tube brush-shaped plant fiber obtained by stripping the cellulose nanofiber from the surface part of the plant fiber has a higher specific surface area than the original plant fiber; meanwhile, cellulose molecular chains contain rich hydroxyl groups, and after oxidation, the fiber surface can generate rich carboxyl and aldehyde functional groups, so that the test tube brush-shaped plant fiber has more reaction sites and higher reactivity. Therefore, the test tube brush-shaped plant fiber is applied to the preparation of the high-performance composite material, a strong mechanical interlocking effect can be generated in the process of compounding with the polymer, and the nano fiber at the interface of the composite material is beneficial to transferring stress from the matrix to the fiber more uniformly, for example, the Young modulus of the pure polylactic acid composite material can be doubled. In addition, the surface of the test tube brush-shaped plant fiber contains abundant functional groups, and the surface of the test tube brush-shaped plant fiber is easy to be further subjected to chemical modification or physical modification, such as cross-linking modification, grafting modification, conductive particle coating and the like, so that the interaction among fibers and the performances of conductivity, hydrophilicity and hydrophobicity and the like of the surface of the fiber are regulated and controlled, and the test tube brush-shaped plant fiber is better applied to the preparation of cellulose materials, functional fabrics and oil-water separation materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is the SEM images of the unmodified ramie fiber (a), the modified ramie fiber (b) and the modified ramie fiber (c) in example 1.
FIG. 2 is a graph showing the titration of the carboxyl content of the unmodified (a) and modified (b) ramie fibers of example 1.
FIG. 3 is the scanning electron microscope images of the unmodified (a), modified (b) and modified (c) partial enlargements of the ramie fiber fabric in example 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention are commercially available unless otherwise specified.
Example 1
A preparation method of a test tube brush-shaped plant fiber comprises the following steps:
(1) The method comprises the following steps of dispersing ramie fibers (bast fibers) in a NaOH solution with the mass fraction of 7% according to a solid-to-liquid ratio of 1.
(2) Dispersing 1 g of the alkali-treated ramie fibers obtained in step (1) in an acetic acid buffer (pH 3.8, volume 90 mL), and adding 1 mmol of TEMPO, 32 mmol of NaClO and 130 mmol of NaClO in this order 2 Reacting at 40 ℃ for 6 h, repeatedly washing with deionized water after the reaction is finished to obtain the test tube brush-shaped ramie fiber, and refrigerating for later use.
FIG. 1 (a) shows unmodified, original ramie fibers with a smoother surface and a lower roughness; fig. 1 (b) shows the ramie fiber with the modified surface in the form of a test-tube brush in this embodiment, and as shown in fig. 1 (c), it is found by comparison that a large amount of nanofibers appear on the surface of the ramie fiber after oxidation modification, the average diameter of the nanofibers is 125 nm, the specific surface area of the ramie fiber is increased, and the ramie fiber has a test-tube brush structure as a whole.
The carboxyl content of the fiber surface was measured by conductometry (as shown in fig. 2). FIG. 2 (a) is a titration chart of the carboxyl content of unmodified ramie fibers, and it can be seen that fibrils have almost no carboxyl group; FIG. 2 (b) is a titration chart of the carboxyl content of the modified ramie fibers, and the carboxyl content of the modified ramie fibers is calculated to be 0.8 mmol/g, which shows that the carboxyl content of the modified ramie fibers is obviously increased.
Example 2
A preparation method of a test tube brush-shaped plant fiber comprises the following steps:
(1) Dispersing sisal fibers (leaf fibers) in a NaOH solution with the mass fraction of 10% according to the solid-to-liquid ratio of 1.
(2) Taking 1 g of the alkali-treated sisal fibers in the step (1) to disperse in a sodium carbonate-sodium bicarbonate buffer solution (pH is 10.2, and the volume is 10 mL), sequentially adding 0.1 mmol of TEMPO, 0.5 mmol of NaBr and 5 mmol of NaClO, adjusting the pH value to 10-10.5, stirring and reacting at 20 ℃ for 120 h, repeatedly washing with deionized water after the reaction is finished, thus obtaining test tube brush-shaped sisal fibers, and freezing and storing for later use.
Example 3
A preparation method of a test tube brush-shaped plant fiber comprises the following steps:
(1) Soaking ramie fiber bundles (bast fibers) in a NaOH solution with the mass fraction of 0.1% according to the solid-to-liquid ratio of 1.
(2) Taking 1 g of the alkali-treated ramie fiber bundle of step (1), soaking the alkali-treated ramie fiber bundle in a phosphate buffer (pH 6.8, volume 1L), and sequentially adding 10 mmol of TEMPO, 50 mmol of NaClO and 500 mmol of NaClO 2 And (3) oscillating and reacting for 60 hours in a shaking table at 25 ℃, repeatedly washing with deionized water after the reaction is finished to obtain the test tube brush-shaped ramie fiber bundle, and refrigerating and storing for later use.
Example 4
A preparation method of a test tube brush-shaped plant fiber comprises the following steps:
(1) Firstly, placing beakers respectively containing 4 mass percent of NaOH solution and deionized water in a constant-temperature water bath kettle, heating to 90 ℃, then sequentially immersing ramie fiber fabrics (bast fibers) in the NaOH solution and the deionized water for 1 hour respectively, continuously stirring, washing the ramie fiber fabrics to be neutral by using normal-temperature deionized water for multiple times, and placing the ramie fiber fabrics in a 60 ℃ drying oven for drying for 12 hours to obtain the alkali-treated ramie fiber fabrics, wherein the bath ratio is 1.
(2) Soaking 1 g of the alkali-treated ramie fabric obtained in step (1) in 100 mL of an acetic acid buffer solution (pH 3.8), and sequentially adding 0.6 mmol of TEMPO, 6 mmol of NaClO and 10 mmol of NaClO 2 Reacting the reaction system at 60 ℃ for 6 h, repeatedly washing the reaction system with deionized water to be neutral after the reaction is finished, obtaining the fabric containing the test tube brush-shaped plant fibers, and refrigerating and storing the fabric for later use.
The scanning electron microscope images of the ramie fiber fabric before and after modification of the embodiment are shown in fig. 3, and fig. 3 (a) is an original ramie fiber fabric, so that it can be seen that the original plant fiber has a smooth surface and a low surface roughness; fig. 3 (b) shows the modified ramie fiber fabric, and after further enlargement, as shown in fig. 3 (c), a large number of nano-fibers appear on the surface of the ramie fiber fabric after oxidation modification, and the average diameter of the nano-fibers is 194 nm.
Application example 1
A composite was prepared using the test tube brush ramie fibers of example 1:
the ramie fibers in the shape of a test tube brush prepared in example 1 and polylactic acid (PLA) were dried in a vacuum oven at 60 ℃ for 12 hours. Adding the test tube brush-shaped ramie fibers and the PLA into an internal mixer according to the mass ratio of 1. And (3) preparing the prepared composite material into a tensile sample strip by a vacuum molding press, wherein the molding temperature is 190 ℃, the plasticizing time is 8 min, and the pressure maintaining time is 8 min.
The test tube brush-shaped ramie fibers were named mRF. The composite material is named as follows: the percentage content of the polylactic acid-test tube brush-shaped ramie fiber-fiber is, for example, the composite material with the mass ratio of the test tube brush-shaped ramie fiber to the polylactic acid being 1 is named as PLA-mRF-10, and by analogy, the other two prepared composite materials are named as PLA-mRF-20 and PLA-mRF-30, and the pure PLA material is used as a reference substance. The tensile properties of the composite PLA-mRF-10, PLA-mRF-20, PLA-mRF-30 and the control PLA-only material were measured as shown in Table 1.
As can be seen from Table 1, compared with a pure PLA material, the Young modulus of the test tube brush-shaped ramie fiber can be doubled while the good tensile strength of the PLA is maintained, and the test tube brush-shaped ramie fiber prepared by the method achieves the purpose of enhancing the performance of the PLA material.
Application example 2
Preparation of a cellulose block material using the test tube brush-like ramie fiber of example 1:
the test tube brush-shaped ramie fibers prepared in example 1 were soaked in 50 mL of 1 mmol/L CaCl 2 Soaking in the solution for 12 hr, vacuum filtering to obtain ramie fiber filter cake, pressing in a molding press at 105 deg.C for 15 min, drying in a blast oven at 60 deg.C for 12 hr to obtain ramie fiber block, and adding Ca 2+ And (3) crosslinking the carboxyl on the surface of the test tube brush-shaped ramie fiber to obtain the ramie fiber block material. The surface of the original ramie fiber does not contain carboxyl groups and can not pass Ca 2+ Crosslinking to obtain the cellulose block material.
Application example 3
Functional fabrics were prepared using the test tube brush ramie fiber fabric of example 4:
soaking the test tube brush-shaped plant fiber fabric prepared in the example 4 in 0.5 mass percent of carbon nano tube dispersion liquid at room temperature, fishing out after ultrasonic treatment for 1 hour, repeatedly washing with deionized water, and drying in an oven at 50 ℃ overnight to obtain a functional fabric with conductivity, wherein the conductivity is measured to be 4S/m. The non-modified ramie fiber fabric is prepared into a functional fabric with conductivity according to the same method, and the conductivity is only 0.04S/m.
Application example 4
An oil-water separation material was prepared using the test tube brush-like ramie fiber fabric of example 4:
the test tube brush-shaped ramie fiber fabric prepared in the example 4 is taken and soaked in a hydrophobic modifier (an ethanol solution of a hexadecyl silane coupling agent), the soaked ramie fiber fabric is taken out after being soaked for 30 min at room temperature and repeatedly washed by ethanol, and finally the ramie fiber fabric is dried in an oven at 50 ℃ overnight, so that the hydrophobic oleophylic fabric for oil-water separation is obtained. Compared with the unmodified ramie fiber hydrophobic oleophylic fabric, the hydrophobic oleophylic fabric prepared by the method has better hydrophobicity, and a large number of nano fibers on the surface of the modified fabric provide more reaction sites for grafting of the silane coupling agent, so that the hydrophobic oleophylic fabric of the modified ramie fiber has stronger hydrophobicity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a test tube brush-shaped plant fiber is characterized by comprising the following steps:
(1) Adding plant fiber into NaOH solution for reaction, washing and drying to obtain alkali-treated plant fiber;
(2) And (2) adding water into the alkali-treated plant fibers obtained in the step (1) for dispersion, adjusting the pH value, and treating by using a TEMPO oxidation system to obtain the test tube brush-shaped plant fibers.
2. The method for preparing a test tube brush-like plant fiber according to claim 1, wherein: the plant fiber in the step (1) is any one of bast fiber, leaf fiber, fruit fiber and seed fiber obtained from natural plants, and is in the form of any one of single fiber, fiber bundle and fiber fabric.
3. The method for producing a test tube brush-like plant fiber according to claim 2, wherein: the solid-liquid ratio of the plant fiber to the NaOH solution is 1: (1-200); the mass fraction of the NaOH solution is 0.1-10%; the reaction temperature is-10-90 deg.C and the reaction time is 0.5-72 h.
4. The method for producing a test tube brush-like plant fiber according to claim 1, characterized in that: dispersing each gram of alkali-treated plant fiber in the step (2) by using 0.01-1L of deionized water; the pH adjustment is specifically to adjust the pH to 2.6-13.0 using one or more of a buffer, an acid and a base.
5. The method for producing a test tube brush-like plant fiber according to claim 4, wherein: the buffer solution is any one of acetic acid buffer solution, phosphoric acid buffer solution and sodium carbonate-sodium bicarbonate buffer solution.
6. The method according to claim 1, wherein the reaction mixture is heated to a temperature in the reaction mixture: the condition of using the TEMPO oxidation system in the step (2) is that the temperature is 20-100 ℃ and the time is 1-120 h; the TEMPO oxidation system is TEMPO/NaClO 2 System or TEMPO/NaBr/NaClO system.
7. The method for producing a test tube brush-like plant fiber according to claim 6, wherein: the TEMPO/NaClO 2 The system comprises 0.1-10 mmol of TEMPO, 0.5-50 mmol of NaClO and 5-500 mmol of NaClO 2 。
8. The method for producing a test tube brush-like plant fiber according to claim 6, wherein: the TEMPO/NaBr/NaClO system comprises 0.1-10 mmol of TEMPO, 0.5-50 mmol of NaBr and 5-500 mmol of NaClO.
9. A plant fiber in the form of a test tube brush obtained by the production method according to any one of claims 1 to 8.
10. The use of the test tube brush-shaped plant fiber according to claim 9 in the preparation of composite materials, cellulosic materials, functional fabrics, and oil-water separation materials.
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