CN114232336A - Hemp diphenol modified viscose fiber and preparation method thereof - Google Patents
Hemp diphenol modified viscose fiber and preparation method thereof Download PDFInfo
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- CN114232336A CN114232336A CN202111616906.2A CN202111616906A CN114232336A CN 114232336 A CN114232336 A CN 114232336A CN 202111616906 A CN202111616906 A CN 202111616906A CN 114232336 A CN114232336 A CN 114232336A
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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
- D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
- D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
- D06M14/20—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin
- D06M14/22—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin of vegetal origin, e.g. cellulose or derivatives thereof
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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
- D06M11/32—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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- 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
- D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
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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
- 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
- D06M2101/06—Vegetal fibres cellulosic
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Abstract
The invention relates to the technical field of household textiles, in particular to a cannabidiol modified viscose fiber and a preparation method thereof. The preparation method comprises the following steps: adding nano cannabidiol and azobisisoheptonitrile into a solvent to obtain a mixed solution; and (2) soaking the viscose in an aqueous solution of sodium hydroxide, washing and drying, then placing the viscose in a mixed solution under the atmosphere of ultrasound and inert gas for grafting reaction, and then washing and drying to obtain the cannabidiol modified viscose. In the invention, the combination of the cannabidiol and the viscose fiber is a grafting mode rather than a crosslinking mode of a crosslinking agent, so that the technical problems that the mobility of a molecular chain is reduced along with the progress of a crosslinking reaction and the crosslinking reaction of a crosslinking molecular chain segment is influenced after the crosslinking molecular chain segment is firstly carried out do not exist, thereby improving the reaction uniformity and the antibacterial stability and the deodorization performance of the reaction product cannabidiol modified viscose fiber.
Description
Technical Field
The invention relates to the technical field of household textiles, in particular to a cannabidiol modified viscose fiber and a preparation method thereof.
Background
Viscose fiber is also called viscose fiber and viscose silk, and is one kind of artificial fiber. The viscose fiber is regenerated cellulose fiber which is spun by cellulose sulfonate solution by using natural cellulose as a basic raw material. The viscose fiber has the characteristics of smoothness, coolness, air permeability, moisture absorption, static resistance, easy dyeing and the like, and is widely applied to various household textiles.
In order to improve the antibacterial property of viscose fabrics, people try to introduce cannabidiol into viscose. However, the fabric processed by the viscose fiber containing the cannabidiol prepared by the existing method has lower cannabidiol content, and the cannabidiol is easy to fall off in the washing process.
In order to solve the technical problems that the content of cannabidiol in fabrics processed by viscose fibers containing cannabidiol prepared by the existing method is low, and the cannabidiol is easy to fall off in the washing process, the patent document with the publication number of CN113136728A provides a method for applying cannabidiol extract to home textile fabrics, which comprises the following steps: (1) extracting cannabidiol raw material, namely extracting cannabidiol raw material from industrial cannabis; (2) preparing the cannabidiol raw material obtained in the step (1) into capsules; (3) preparing the capsules prepared in the step (2) into finishing liquid, wherein the ratio of the finishing liquid is as follows: comprises cannabidiol extract microcapsule 102g/L and cross-linking agent 11 g/L; (4) applying the finishing liquor prepared in the step (3) to the fabric by adopting an impregnation method, and specifically comprises the following steps: drying and shaping the cotton fabric, and then soaking the cotton fabric in finishing liquor for 30 minutes at room temperature, wherein the bath ratio of the finishing liquor is 100: 10. according to the scheme, the cannabidiol is in a uniform emulsified state, so that the combination effect of the cannabidiol extract microcapsules and the fabric is improved, and the cannabidiol can be stably stored on the textile fabric after being prepared into the microcapsules; after the fabric is extruded, the functional substance of the cannabidiol can be released immediately, and can also be prevented from being influenced and interfered by other substances in the production process of the textile, then the cannabidiol microcapsules are prepared into finishing liquid through a cross-linking agent, and the cross-linking agent is added to serve as an activator, so that the combination effect of the cannabidiol extract microcapsules and the fabric is improved. However, this solution has the following drawbacks: with the progress of the cross-linking reaction, the mobility of the molecular chain is reduced, the cross-linking molecular chain segment influences the progress of the cross-linking reaction of the post-cross-linking molecular chain segment, so that the dispersion uniformity of the cannabidiol in the prepared fabric is poor, and the improvement degree of the antibacterial and deodorizing performance of the fabric is limited.
Disclosure of Invention
In view of the above, the present invention aims to provide a cannabidiol modified viscose fiber and a preparation method thereof, which are used for solving the problems that in the prior art, the uniformity of cannabidiol dispersion in a fabric prepared by using the existing method is poor, and the improvement degree of the antibacterial and deodorizing performance of the fabric is limited.
In a first aspect, the present invention provides a method for preparing a cannabidiol modified viscose fiber, comprising the following steps:
A. adding nano cannabidiol and azobisisoheptonitrile into a solvent to obtain a mixed solution;
B. and (2) soaking the viscose in an aqueous solution of sodium hydroxide, washing and drying, then placing the viscose in a mixed solution under the atmosphere of ultrasound and inert gas for grafting reaction, and then washing and drying to obtain the cannabidiol modified viscose.
Optionally, in step a, the nano cannabidiol has a particle size of 20-80nm, preferably 20-50 nm.
Optionally, in the step a, the mass ratio of the nano cannabidiol to the azobisisoheptonitrile is 100: 0.3-0.6, preferably 100: 0.5-0.6.
Optionally, in the mixed solution in the step a, the concentration of the nano cannabidiol is 6 wt% to 10 wt%, preferably 6 wt% to 8 wt%.
Optionally, in step a, styrene is further added to the mixed solution.
Optionally, the volume ratio of styrene to solvent is 2-5: 100, preferably 3 to 5: 100.
optionally, in the step a, N-methyldiethanolamine is further added to the mixed solution.
Optionally, the volume ratio of N-methyldiethanolamine to solvent is 0.4-0.9: 100, preferably 0.5-0.9: 100.
optionally, in step a, the solvent is methanol or ethanol or a combination of methanol and ethanol.
Optionally, in step B, the fineness of the viscose fibers is 1 to 6dtex, preferably 1 to 2.5 dtex.
Optionally, in step B, the concentration of sodium hydroxide in the aqueous sodium hydroxide solution is 15 wt% to 20 wt%, preferably 18 wt% to 20 wt%.
Optionally, in the step B, the soaking temperature is 0-10 ℃, preferably 0-5 ℃; the soaking time is 1-3h, preferably 2-3 h.
Optionally, in step B, the mass ratio of the sodium hydroxide aqueous solution to the viscose fibers is 15-25: 1, preferably 20 to 25: 1.
optionally, in the step B, the drying temperature is 60-80 ℃, preferably 70-80 ℃; the drying time is 15-25min, preferably 20-25 min.
Optionally, in the step B, the intensity of the ultrasound is 200-400W/cm2Preferably 300-400W/cm2。
Optionally, in the step B, the mass ratio of the mixed solution to the viscose is 5-15: 1, preferably 10 to 15: 1.
optionally, in step B, the temperature of the grafting reaction is 50-60 ℃, preferably 55-60 ℃; the time of the grafting reaction is 1 to 2 hours, preferably 1.5 to 2 hours.
Optionally, in step B, the drying temperature is 75-85 ℃, preferably 80-85 ℃; the drying time is 15-25min, preferably 20-25 min.
In a second aspect, the present invention also aims to provide the cannabidiol modified viscose fiber prepared by the preparation method.
The invention has the beneficial effects that:
(1) in the invention, the sodium hydroxide aqueous solution can reduce the crystallinity of the viscose fiber, convert a part of crystalline region into an amorphous region, increase the proportion of the amorphous region in the viscose fiber, further increase the accessibility of the cellulose and promote the grafting reaction.
(2) In the invention, the ultrasonic action can improve the dispersion uniformity of cannabidiol in the mixed solution, thereby improving the uniformity of grafting reaction; in addition, the ultrasonic effect can also improve the grafting reaction activity of the cellulose in the viscose fiber, increase the accessibility of the cellulose and further promote the grafting reaction.
(3) In the invention, the azodiisoheptanonitrile is heated and decomposed to generate free radicals to initiate grafting reaction; the cannabidiol is grafted to the viscose fibers through a grafting reaction, and the cannabidiol and the viscose fibers are subjected to the grafting reaction through the vinyl groups carried by the cannabidiol, so that the cannabidiol is introduced into the viscose fibers through a chemical bond combination mode, and the combination strength of the cannabidiol and the viscose fibers is improved; according to the invention, the combination of the cannabidiol and the viscose fiber is a grafting mode rather than a crosslinking mode of a crosslinking agent, so that the technical problems that the mobility of a molecular chain is reduced along with the progress of a crosslinking reaction, and the crosslinking reaction of a crosslinking molecular chain segment is influenced after the crosslinking molecular chain segment is firstly carried out do not exist, thereby improving the reaction uniformity, improving the antibacterial stability and the deodorization performance of the cannabidiol modified viscose fiber as a reaction product, and further improving the antibacterial property and the deodorization performance of the fabric processed by the cannabidiol modified viscose fiber.
(4) In the invention, the styrene and the cannabidiol can form the styrene/cannabidiol polymer with a long branched chain structure, the reaction activity of the styrene/cannabidiol polymer and the viscose is greater than that of the cannabidiol, the affinity of the styrene/cannabidiol polymer and the viscose is greater than that of the cannabidiol, and the grafting rate is further improved.
(5) In the invention, the N-methyldiethanolamine can accelerate the thermal decomposition rate of the azobisisoheptonitrile, promote the grafting reaction and further improve the grafting rate.
(6) The cannabidiol modified viscose fiber prepared by the method has good antibacterial property and deodorization property.
Detailed Description
The present invention is further illustrated by the following specific examples, but it should be noted that the specific material ratios, process conditions, results, etc. described in the examples of the present invention are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the scope of the present invention. It is to be noted that "wt%" as indicated in the description herein means "mass fraction" unless otherwise specified.
The invention provides a preparation method of cannabidiol modified viscose fiber, which comprises the following steps:
A. nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.3-0.6, adding into solvent to obtain mixed solution of nanometer cannabidiol with concentration of 6-10 wt%, wherein the solvent is methanol or ethanol or a combination of methanol and ethanol;
B. soaking the viscose fiber with the fineness of 1-6dtex in a sodium hydroxide aqueous solution with the temperature of 0-10 ℃ and the concentration of 15-20 wt% for 1-3h, wherein the mass ratio of the sodium hydroxide aqueous solution to the viscose fiber is 15-25: 1; then washed with water for 2-3 times, dried at 60-80 ℃ for 15-25min, and then dried at 200-400W/cm2Placing the viscose fibers in the mixed solution for grafting reaction for 1-2h under the ultrasonic intensity and inert gas atmosphere, wherein the mass ratio of the mixed solution to the viscose fibers is 5-15: 1, the temperature of grafting reaction is 50-60 ℃; then washing with ethanol for 2-3 times, and drying at 75-85 deg.C for 15-25min to obtain the cannabidiol modified viscose fiber.
In another embodiment of the present invention, styrene is further added to the mixed solution, and the volume ratio of styrene to the solvent is 2-5: 100, preferably 3 to 5: 100.
in another embodiment of the present invention, N-methyldiethanolamine is further added to the mixed solution, and the volume ratio of the N-methyldiethanolamine to the solvent is 0.4-0.9: 100, preferably 0.5-0.9: 100.
the present invention will be described in detail below with reference to specific exemplary embodiments. It should also be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention, and that numerous insubstantial modifications and adaptations of the invention described above will occur to those skilled in the art. The specific process parameters and the like of the following examples are also only one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below.
Example 1
A preparation method of cannabidiol modified viscose fibers comprises the following specific steps:
A. pulverizing cannabidiol to 20nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.6 is added into ethanol and stirred to obtain a mixed solution with the concentration of the nano cannabidiol of 10 weight percent;
B. placing the common viscose fiber with the fineness of 1dtex into a sodium hydroxide aqueous solution with the temperature of 0 ℃ and the concentration of 18 wt% for soaking for 3 hours, wherein the mass ratio of the sodium hydroxide aqueous solution to the viscose fiber is 25: 1; followed by washing with water 3 times, followed by oven drying at 80 deg.C for 25min, followed by 400W/cm2Placing the viscose fibers in the mixed solution for grafting reaction for 2 hours under the ultrasonic intensity and nitrogen atmosphere, wherein the mass ratio of the mixed solution to the viscose fibers is 15: 1, the temperature of grafting reaction is 55 ℃; then washing with ethanol for 3 times, and drying at 85 deg.C for 25min to obtain cannabidiol modified viscose fiber.
Example 2
A preparation method of cannabidiol modified viscose fibers comprises the following specific steps:
A. pulverizing cannabidiol to 50nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.5, adding into methanol, and stirring to obtain a mixed solution with the concentration of the nano cannabidiol being 8 wt%;
B. placing common viscose fiber with the fineness of 6dtex into a sodium hydroxide aqueous solution with the temperature of 5 ℃ and the concentration of 20 wt% for soaking for 2 hours, wherein the mass ratio of the sodium hydroxide aqueous solution to the viscose fiber is 20: 1; then washed 2 times with water, then dried at 70 ℃ for 20min, and then dried at 300W/cm2Ultrasonic intensity and nitrogen atmospherePlacing the viscose in the mixed solution for grafting reaction for 1.5h, wherein the mass ratio of the mixed solution to the viscose is 10: 1, the temperature of grafting reaction is 60 ℃; then washing with ethanol for 2 times, and drying at 80 deg.C for 20min to obtain cannabidiol modified viscose fiber.
Example 3
A preparation method of cannabidiol modified viscose fibers comprises the following specific steps:
A. pulverizing cannabidiol to 80nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.3, adding into ethanol, and stirring to obtain a mixed solution with the concentration of the nano cannabidiol being 6 wt%;
B. placing the common viscose fiber with the fineness of 2.5dtex into a sodium hydroxide aqueous solution with the temperature of 10 ℃ and the concentration of 15 wt% to be soaked for 1.5h, wherein the mass ratio of the sodium hydroxide aqueous solution to the viscose fiber is 15: 1; followed by washing with water 3 times, followed by drying at 60 ℃ for 15min, followed by drying at 200W/cm2Placing the viscose fibers in the mixed solution for grafting reaction for 2 hours under the ultrasonic intensity and nitrogen atmosphere, wherein the mass ratio of the mixed solution to the viscose fibers is 5: 1, the temperature of grafting reaction is 50 ℃; then washing with ethanol for 3 times, and drying at 85 deg.C for 15min to obtain cannabidiol modified viscose fiber.
Example 4
A cannabidiol-modified viscose fiber was prepared in the same manner as in example 1, except for the following conditions:
A. styrene and ethanol are mixed according to a volume ratio of 5: 100, uniformly mixing to obtain a mixed solution; pulverizing cannabidiol to 20nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.6 is added into the mixed solution and stirred to obtain the mixed solution with the concentration of the nano cannabidiol of 10 weight percent.
Example 5
A cannabidiol-modified viscose fiber was prepared in the same manner as in example 1, except for the following conditions:
A. styrene and ethanol are mixed according to a volume ratio of 2: 100, uniformly mixing to obtain a mixed solution; pulverizing cannabidiol to 20nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.6 is added into the mixed solution and stirred to obtain the mixed solution with the concentration of the nano cannabidiol of 10 weight percent.
Example 6
A cannabidiol-modified viscose fiber was prepared in the same manner as in example 1, except for the following conditions:
A. n-methyldiethanolamine and ethanol are mixed according to the volume ratio of 0.9: 100, uniformly mixing to obtain a mixed solution; pulverizing cannabidiol to 20nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.6 is added into ethanol and stirred to obtain the mixed solution with the concentration of the nano cannabidiol of 10 weight percent.
Example 7
A cannabidiol-modified viscose fiber was prepared in the same manner as in example 1, except for the following conditions:
A. n-methyldiethanolamine and ethanol are mixed according to a volume ratio of 0.4: 100, uniformly mixing to obtain a mixed solution; pulverizing cannabidiol to 20nm to obtain nanometer cannabidiol; nano cannabidiol and azobisisoheptonitrile are mixed according to the mass ratio of 100: 0.6 is added into ethanol and stirred to obtain the mixed solution with the concentration of the nano cannabidiol of 10 weight percent.
Comparative example 1
Common viscose fibres of the same fineness of 1dtex as the source of example 1.
Performance detection
The cannabidiol modified viscose fibers obtained in examples 1-7 and the common viscose fiber obtained in comparative example 1 are processed into fabrics, and samples of 50cm to 50cm are respectively cut at the edge of one radial side of the fabric (hereinafter referred to as a 1# sample), the position 1/3 radial length away from the edge of one radial side (hereinafter referred to as a 2# sample), the position 2/3 radial length away from the edge of one radial side (hereinafter referred to as a 3# sample) and the edge of the other radial side of the fabric (hereinafter referred to as a 4# sample); according to GB/T33610.3-2019, the deodorizing performance of the textile is measured in part 3: detecting the deodorization rate of the sample by gas chromatography, wherein the odor solution is indole solution;
according to the test condition AIM of GB/T12490 + 1990 method for testing the color fastness of fabrics to household and commercial washing, an ECE standard detergent is adopted, each washing corresponds to 5 times of washing (namely, the washing corresponds to 250 times in total), and the specific washing conditions are as follows: washing with 150mL solution and 10 steel balls at 40 ℃ for 45min, taking out a sample after washing, and washing twice in 100mL water at 40 ℃ for 1min each time; after cleaning, fully cleaning the sample with water, drying, and determining the deodorizing performance of the textile according to GB/T33610.3-2019 part 3: detecting the deodorization rate of the sample by gas chromatography, wherein the odor solution is indole solution; the results are shown in Table 1.
TABLE 1 test results
As can be seen from table 1, the deodorization ratio of the fabrics processed by the viscose fibers of examples 1 to 7 is significantly improved compared to that of comparative example 1; and compared with the fabric before cleaning, the fabric processed by the viscose fibers of the examples 1 to 7 has no significant difference in deodorization rate after cleaning.
The odor removal rate of the face fabric processed from the viscose of example 1 (sample before washing, mean of 4 samples as reference) was improved by about 1.85 times compared to the face fabric processed from the viscose of comparative example 1 (sample before washing, mean of 4 samples as reference).
The deodorizing rates of the fabrics processed from the viscose fibers of examples 4 and 5 (the samples before washing, based on the average of 4 samples) were improved by about 15.6% and 11.1%, respectively, compared to example 1 (the samples before washing, based on the average of 4 samples).
The deodorizing rates of the fabrics processed from the viscose fibers of examples 6 and 7 (the samples before washing, based on the average of 4 samples) were improved by about 18.4% and 14.6%, respectively, compared to example 4 (the samples before washing, based on the average of 4 samples).
In conclusion, the deodorant fabric effectively improves the deodorization performance of the fabric processed by the viscose fiber and effectively improves the bonding fastness of the cannabidiol and the viscose fiber.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The preparation method of the cannabidiol modified viscose fiber is characterized by comprising the following steps:
A. adding nano cannabidiol and azobisisoheptonitrile into a solvent to obtain a mixed solution;
B. and (2) soaking the viscose in an aqueous solution of sodium hydroxide, washing and drying, then placing the viscose in a mixed solution under the atmosphere of ultrasound and inert gas for grafting reaction, and then washing and drying to obtain the cannabidiol modified viscose.
2. The method as claimed in claim 1, wherein in the step a, the nano cannabidiol has a particle size of 20-80 nm;
and/or in the step A, the mass ratio of the nano cannabidiol to the azobisisoheptonitrile is 100: 0.3-0.6;
and/or, in the mixed solution in the step A, the concentration of the nano cannabidiol is 6-10 wt%;
and/or, in the step A, the solvent is methanol or ethanol or a combination of methanol and ethanol.
3. The method according to claim 1, wherein styrene is further added to the mixed solution in step a.
4. The method according to claim 3, wherein the volume ratio of styrene to solvent is 2-5: 100.
5. the method according to claim 1, wherein in step a, N-methyldiethanolamine is further added to the mixed solution.
6. The preparation method according to claim 5, wherein the volume ratio of the N-methyldiethanolamine to the solvent is 0.4-0.9: 100.
7. the method according to claim 1, wherein in step B, the viscose fiber has a fineness of 1 to 6 dtex; and/or in the step B, the concentration of sodium hydroxide in the sodium hydroxide aqueous solution is 15-20 wt%;
and/or in the step B, the soaking temperature is 0-10 ℃; the soaking time is 1-3 h;
and/or in the step B, the mass ratio of the sodium hydroxide aqueous solution to the viscose fibers is 15-25: 1;
and/or in the step B, the drying temperature is 60-80 ℃, and the drying time is 15-25 min; and/or in the step B, the intensity of the ultrasound is 200-2。
8. The preparation method according to claim 1, wherein in the step B, the mass ratio of the mixed solution to the viscose fibers is 5-15: 1.
9. the preparation method according to claim 1, wherein in the step B, the temperature of the grafting reaction is 50-60 ℃, and the time of the grafting reaction is 1-2 h;
and/or in the step B, the drying temperature is 75-85 ℃, and the drying time is 15-25 min.
10. The cannabidiol-modified viscose fiber prepared by the preparation method of any one of claims 1 to 9.
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