Antibacterial and antioxidant viscose fiber as well as preparation method and application thereof
By adding the extracted antibacterial and antioxidant active ingredients to the viscose fiber spinning solution, the problem of viscose fiber lacking antibacterial and antioxidant effects is solved, and the versatility and durability of functional fibers are achieved.
Patent Information
- Application Number
- CN202411663942.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-01-03
AI Technical Summary
The existing viscose fibers lack antibacterial and antioxidant effects and cannot meet the high requirements of modern textiles for functional fibers.
The active ingredients of perilla leaves and isatis roots were extracted by alcohol extraction, and antibacterial and antioxidant extracts were prepared, and mixed with hydrogel suspension was added to viscose fiber spinning stock solution, and through alcohol extraction and alkali The liquid treatment forms antibacterial and antioxidant viscose fibers.
Giving viscose fiber antibacterial and antioxidant effects while improving the durability of antibacterial and antioxidant effects, it is suitable for bedding, clothing and medical supplies.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of textiles, and in particular to an antibacterial and antioxidant viscose fiber and a preparation method and application thereof. Background Art
[0002] Viscose fiber, also known as viscose silk, is a cellulose fiber whose main raw material is chemical pulp (including cotton pulp and wood pulp). Viscose fiber is made of natural fibers such as wood fiber and cotton linters. It is made into soluble cellulose xanthate through alkalization, aging, sulfonation and other processes. The soluble cellulose xanthate is then dissolved in dilute alkali solution to make viscose, which is then made through wet spinning. Viscose fiber has good hygroscopicity, is easy to dye, is not prone to static electricity, and has good spinnability. It is widely used in various textile, clothing and other fields.
[0003] With the development of science and technology and the improvement of living standards, people have put forward higher requirements for textiles, such as the hope that textiles have anti-ultraviolet, antistatic, health care, antibacterial and other functions, and various functional fibers and textiles are constantly emerging. Functional fibers refer to new fibers that have some special functions in addition to the physical and mechanical properties of ordinary fibers, such as health care functions (such as antibacterial, mite killing, physical therapy, deodorization, etc.), protective functions (such as radiation protection, antistatic, anti-ultraviolet, etc.), thermal and moist comfort functions (such as heat absorption, heat release, moisture absorption, moisture release, etc.), medical and environmental protection functions (such as biocompatibility, biodegradability). However, existing viscose fibers do not have antibacterial and antioxidant effects. Summary of the invention
[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides an antibacterial and antioxidant viscose fiber and a preparation method and application thereof, so as to impart antibacterial and antioxidant effects to the viscose fiber.
[0005] To achieve the above objectives, the scheme of this application is as follows: In a first aspect, the present invention provides a method for preparing antibacterial and antioxidant viscose fibers, comprising the following steps: S1. extracting the perilla leaves and the isatis root by alcohol extraction to obtain the perilla leaf extract and the isatis root extract; S2. The lignified isatis root stems were crushed, ball-milled, sieved, placed in an alkali solution, centrifuged, filtered, washed until neutral, dried, placed in a sodium hydroxide-urea aqueous solution, frozen, and dissolved at room temperature to obtain a hydrogel suspension; S3. Dissolving the perilla leaf extract and the isatis root extract separately to obtain a perilla leaf extract solution and a isatis root extract solution; Mixing the perilla leaf extract solution and the isatis root extract solution to obtain a mixed solution; adding a dispersant to the hydrogel suspension to obtain a premixed solution; Adding the premixed solution into the mixed solution to obtain a functional additive solution; S4. adding the functional additive liquid into the viscose fiber spinning solution to prepare antibacterial and antioxidant viscose fiber.
[0006] Optionally, in step S1, extracting the perilla leaves by alcohol extraction includes: crushing the perilla leaves, immersing them in an ethanol solution after sieving, filtering, vacuum concentrating to dryness, and ball milling.
[0007] Optionally, in step S1, the volume concentration of the ethanol solution is 70%-80%, preferably 72%-80%.
[0008] Optionally, in step S1, the perilla leaves are crushed, sieved and then soaked in an ethanol solution for 10-15 hours, preferably 11-15 hours.
[0009] Optionally, in step S1, vacuum is applied at a temperature of 35-45°C.
[0010] Optionally, in step S1, extracting the Radix Isatidis by alcohol extraction includes: crushing the Radix Isatidis, immersing it in an ethanol solution after screening, filtering, vacuum concentrating to dryness, and ball milling.
[0011] Optionally, in step S1, the Radix Isatidis is crushed, sieved and then soaked in an ethanol solution for 30-40 hours, preferably 32-40 hours.
[0012] Optionally, in step S2, the alkali solution is a sodium hydroxide solution.
[0013] Optionally, in step S2, the concentration of the alkali solution is 2wt%-5wt%, preferably 3wt%-5wt%.
[0014] Optionally, in step S2, the temperature of the alkali solution is 40-50°C, preferably 42-50°C.
[0015] Optionally, in step S2, the mixture is placed in an alkaline solution for treatment for 3-5 hours, preferably 3.5-5 hours.
[0016] Optionally, in step S2, the drying temperature is 55-65°C, preferably 58-65°C; the drying time is 7-9h, preferably 7.5-9h.
[0017] Optionally, in step S2, the temperature of the sodium hydroxide-urea aqueous solution is -8 to -12°C, preferably -9 to -12°C.
[0018] Optionally, in the sodium hydroxide-urea aqueous solution in step S2, the mass ratio of sodium hydroxide to urea is 6-8:14-16, preferably 7-8:15-16.
[0019] Optionally, in step S2, the mass ratio of the dried solid to the sodium hydroxide-urea aqueous solution is 1:18-21, preferably 1:19-21.
[0020] Optionally, in step S2, the freezing temperature is -16~-20°C, preferably -17~-20°C; the freezing time is 7-9h, preferably 7.5-9h.
[0021] Optionally, in step S3, water at a temperature of 40-50° C. is used to dissolve the perilla leaf extract.
[0022] Optionally, in step S3, the mass ratio of the perilla leaf extract to the solvent used is 1:4-6.
[0023] Optionally, in step S3, water at a temperature of 40-50° C. is used to dissolve the Radix Isatidis extract.
[0024] Optionally, in step S3, the mass ratio of the Radix Isatidis extract to the solvent used is 1:4-6, preferably 1:4.5-6.
[0025] Optionally, in step S3, the volume ratio of the perilla leaf extract solution to the isatis root extract solution is 1:1-3.
[0026] Optionally, in step S3, the dispersant is selected from at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate.
[0027] Optionally, in the premixed liquid of step S3, the concentration of the dispersant is 0.5wt%-2.0wt%, preferably 0.6wt%-2.0wt%.
[0028] Optionally, in the functional additive liquid in step S3, the concentration of the perilla leaf extract is 3wt%-6wt%.
[0029] Optionally, in step S4, the mass ratio of the sum of the perilla leaf extract and the isatis root extract in the functional additive solution to the methyl cellulose contained in the viscose fiber spinning solution is 10-20:100, preferably 12-20:100.
[0030] In a second aspect, the present invention also provides antibacterial and antioxidant viscose fibers prepared according to the method described above.
[0031] In a third aspect, the present invention also provides the use of the antibacterial and antioxidant viscose fiber described above in bedding, wadding filling, clothing and medical supplies.
[0032] Beneficial effects of the present invention: The present application uses lignified isatis root as the raw material of hydrogel, and utilizes the hydrogel to adsorb perilla leaf extract with antioxidant effect and isatis root extract with antibacterial effect to prepare a functional additive liquid, which is added to the spinning solution to prepare fibers. While giving the viscose fiber antibacterial and antioxidant effects, it can also improve the durability of the antibacterial and antioxidant effects.
[0033] The fiber of the invention has good health protection, excellent wearing performance and good textile processing performance, and can be widely used in the fields of bedding, flake filling, clothing and medical supplies. DETAILED DESCRIPTION
[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention can be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.
[0035] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.
[0036] One embodiment of the present application provides a method for preparing antibacterial and antioxidant viscose fiber, comprising the following steps: S1. Extracting the perilla leaves by an alcohol extraction method: crushing the perilla leaves, sieving them, soaking them in an ethanol solution, filtering them, concentrating them to dryness under vacuum, and ball milling them to obtain a perilla leaf extract; The isatis root is extracted by alcohol extraction: the isatis root is crushed, sieved, immersed in an ethanol solution, filtered, vacuum-concentrated to dryness, and ball-milled to obtain the isatis root extract; S2. The lignified isatis root stems were crushed, ball-milled, sieved, placed in an alkali solution with a concentration of 2wt%-5wt% and a temperature of 40-50°C for 3-5h, centrifuged, filtered, washed until neutral, dried at 55-65°C for 7-9h, placed in a sodium hydroxide-urea aqueous solution at a temperature of -8~-12°C, frozen at a temperature of -16~-20°C for 7-9h, and dissolved at room temperature to obtain a hydrogel suspension; The alkali solution is sodium hydroxide solution; In the sodium hydroxide-urea aqueous solution, the mass ratio of sodium hydroxide to urea is 6-8:14-16; The mass ratio of the dried solid to the sodium hydroxide-urea aqueous solution is 1:18-21; S3. Dissolving the perilla leaf extract and the isatis root extract in water at a temperature of 40-50° C. to obtain a perilla leaf extract solution and a isatis root extract solution, wherein the mass ratio of the perilla leaf extract to water is 1:4-6, and the mass ratio of the isatis root extract to water is 1:4-6; Mixing the perilla leaf extract solution and the isatis root extract solution in a volume ratio of 1:1-3 to obtain a mixed solution; Adding a dispersant to the hydrogel suspension to obtain a premixed solution with a dispersant concentration of 0.5wt%-2.0wt%, wherein the dispersant is selected from at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate; adding the premixed liquid into the mixed liquid to obtain a functional additive liquid having a concentration of 3 wt % to 6 wt % of the perilla leaf extract; S4. Adding the functional additive liquid into the viscose fiber spinning solution to prepare the antibacterial and antioxidant viscose fiber, the mass ratio of the functional additive liquid to the cellulose alpha contained in the viscose fiber spinning solution is 10-20:100.
[0037] Another embodiment of the present invention also provides an antibacterial and antioxidant viscose fiber prepared according to the method as described above.
[0038] Another embodiment of the present invention also provides the use of the antibacterial and antioxidant viscose fiber as described above in bedding, wadding filling, clothing and medical supplies.
[0039] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.
[0040] Example 1 A method for preparing antibacterial and antioxidant viscose fiber, the specific steps are as follows: S1. Preparation of Perilla Extract and Radix Isatidis Extract The perilla leaves were crushed, passed through a 40-mesh sieve, and then immersed in a 75% volume concentration ethanol solution for 12 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain a perilla leaf extract; The isatis root was crushed, passed through a 40-mesh sieve, and then soaked in an ethanol solution with a volume concentration of 75% for 36 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain the isatis root extract; S2. Preparation of Radix Isatidis Hydrogel The lignified isatis root stems were dried and crushed, ball-milled, and passed through an 80-mesh sieve. The sieved powder was immersed in a sodium hydroxide solution with a temperature of 45°C and a concentration of 3wt% for 4 hours, centrifuged, filtered, and washed with water until neutral, and dried in a 60°C oven for 8 hours. The dried powder was added to a sodium hydroxide-urea aqueous solution (the mass ratio of sodium hydroxide to urea was 7:15, and the concentration of sodium hydroxide was 7wt%) at a temperature of -10°C, and the mass ratio of the solid powder to the solution was 1:20. After sufficient stirring, it was frozen at a temperature of -18°C for 8 hours, and dissolved at room temperature to obtain a hydrogel suspension. S3. The perilla leaf extract and the isatis root extract were dissolved in 45°C water, respectively, and ultrasonically vibrated to make them uniformly dispersed, and the mass ratio of each extract to water was 1:5 to obtain a perilla leaf extract solution and a isatis root extract solution; The perilla extract solution and the isatis root extract solution are mixed evenly in a volume ratio of 1:1 to obtain a mixed solution; Adding sodium dodecylbenzene sulfonate to the hydrogel suspension to obtain a premixed solution having a sodium dodecylbenzene sulfonate concentration of 0.5%wt; The premixed solution is added to the mixed solution to obtain a functional additive solution having a concentration of 5 wt % of the perilla leaf extract; S4. Using cellulose pulp as a raw material, a viscose fiber spinning solution is prepared, and a functional additive liquid is added to the viscose fiber spinning solution by a pre-spinning injection device to prepare a blended spinning solution, and the above-prepared composite modified additive is added in an amount of 10% of the cellulose alpha content in the viscose according to the effective ingredients, and the mass ratio of the sum of the perilla leaf extract and the isatis root extract contained in the functional additive liquid to the cellulose alpha contained in the viscose fiber spinning solution (the amount of cellulose alpha is tested in accordance with "FZ / T50010.4-2011 Determination of the cellulose alpha content in viscose fiber pulp") is 10:100; After spinning and post-treatment (including coagulation, desulfurization, bleaching, oil bath and drying, the coagulation bath contains 72g / L sulfuric acid, 6.5g / L zinc sulfate and 295g / L sodium sulfate, the desulfurization bath contains 1.8g / L sodium sulfite, the bleaching bath contains 4.2g / L hydrogen peroxide, the oil bath concentration is 4.5g / L, and the drying temperature is 115℃), an antibacterial and antioxidant viscose fiber of 1.33dtex*38mm is made.
[0041] Example 2 A method for preparing antibacterial and antioxidant viscose fiber, the specific steps are as follows: S1. Preparation of Perilla Extract and Radix Isatidis Extract The perilla leaves were crushed, passed through a 40-mesh sieve, and then immersed in a 75% volume concentration ethanol solution for 12 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain a perilla leaf extract; The isatis root was crushed, passed through a 40-mesh sieve, and then soaked in an ethanol solution with a volume concentration of 75% for 36 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain the isatis root extract; S2. Preparation of Radix Isatidis Hydrogel The lignified isatis root stems were dried and crushed, ball-milled, and passed through an 80-mesh sieve. The sieved powder was immersed in a sodium hydroxide solution with a temperature of 45°C and a concentration of 3wt% for 4 hours, centrifuged, filtered, and washed with water until neutral, and dried in a 60°C oven for 8 hours. The dried powder was added to a sodium hydroxide-urea aqueous solution (the mass ratio of sodium hydroxide to urea was 7:15, and the concentration of sodium hydroxide was 7wt%) at a temperature of -10°C, and the mass ratio of the solid powder to the solution was 1:20. After sufficient stirring, it was frozen at a temperature of -18°C for 8 hours, and dissolved at room temperature to obtain a hydrogel suspension. S3. The perilla leaf extract and the isatis root extract were dissolved in 45°C water, respectively, and ultrasonically vibrated to make them uniformly dispersed, and the mass ratio of each extract to water was 1:5 to obtain a perilla leaf extract solution and a isatis root extract solution; The perilla extract solution and the isatis root extract solution were mixed evenly in a volume ratio of 1:1.5 to obtain a mixed solution; Adding sodium dodecyl sulfate to the hydrogel suspension to obtain a premixed solution having a sodium dodecyl sulfate concentration of 1.0% wt; The premixed solution is added to the mixed solution to obtain a functional additive solution having a concentration of 3 wt % of the perilla leaf extract; S4. Using cellulose pulp as raw material, preparing viscose fiber spinning solution, adding functional additive liquid to the viscose fiber spinning solution by using pre-spinning injection equipment to prepare a blended spinning solution, the mass ratio of the sum of the perilla leaf extract and the isatis root extract contained in the functional additive liquid to the cellulose alpha contained in the viscose fiber spinning solution (the amount of cellulose alpha is tested in accordance with "FZ / T 50010.4-2011 Determination of cellulose alpha content in viscose fiber pulp") is 15:100; After spinning and post-treatment (including coagulation, desulfurization, bleaching, oil bath and drying, the coagulation bath contains 85g / L sulfuric acid, 7.0g / L zinc sulfate and 315g / L sodium sulfate, the desulfurization bath contains 3.6g / L sodium sulfite, the bleaching bath contains 4.5g / L hydrogen peroxide, the oil bath concentration is 5.8g / L, and the drying temperature is 118°C), an antibacterial and antioxidant viscose fiber of 1.67dtex*38mm is made.
[0042] Example 3 A method for preparing antibacterial and antioxidant viscose fiber, the specific steps are as follows: S1. Preparation of Perilla Extract and Radix Isatidis Extract The perilla leaves were crushed, passed through a 40-mesh sieve, and then immersed in a 75% volume concentration ethanol solution for 12 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain a perilla leaf extract; The isatis root was crushed, passed through a 40-mesh sieve, and then soaked in an ethanol solution with a volume concentration of 75% for 36 hours, the extract was filtered, vacuum-concentrated to dryness at 40°C, and ball-milled to powder (particle size D≤2um) to obtain the isatis root extract; S2. Preparation of Radix Isatidis Hydrogel The lignified isatis root stems were dried and crushed, ball-milled, and passed through an 80-mesh sieve. The sieved powder was immersed in a sodium hydroxide solution with a temperature of 45°C and a concentration of 3wt% for 4 hours, centrifuged, filtered, and washed with water until neutral, and dried in a 60°C oven for 8 hours. The dried powder was added to a sodium hydroxide-urea aqueous solution (the mass ratio of sodium hydroxide to urea was 7:15, and the concentration of sodium hydroxide was 7wt%) at a temperature of -10°C, and the mass ratio of the solid powder to the solution was 1:20. After sufficient stirring, it was frozen at a temperature of -18°C for 8 hours, and dissolved at room temperature to obtain a hydrogel suspension. S3. The perilla leaf extract and the isatis root extract were dissolved in 45°C water, respectively, and ultrasonically vibrated to make them uniformly dispersed, and the mass ratio of each extract to water was 1:5 to obtain a perilla leaf extract solution and a isatis root extract solution; The perilla extract solution and the isatis root extract solution are mixed evenly in a volume ratio of 1:2 to obtain a mixed solution; Adding sodium lauryl sulfate to the hydrogel suspension to obtain a premixed solution having a sodium lauryl sulfate concentration of 1.5%wt; The premixed solution is added to the mixed solution to obtain a functional additive solution having a concentration of 6 wt % of the perilla leaf extract; S4. Using cellulose pulp as a raw material, a viscose fiber spinning solution is prepared, and a functional additive liquid is added to the viscose fiber spinning solution by a pre-spinning injection device to prepare a blended spinning solution, and the above-prepared composite modified additive is added in an amount of 10% of the cellulose alpha content in the viscose according to the effective ingredients, and the mass ratio of the sum of the perilla leaf extract and the isatis root extract contained in the functional additive liquid to the cellulose alpha contained in the viscose fiber spinning solution (the amount of cellulose alpha is tested in accordance with "FZ / T50010.4-2011 Determination of the cellulose alpha content in viscose fiber pulp") is 20:100; After spinning and post-treatment (including coagulation, desulfurization, bleaching, oil bath, drying, the coagulation bath contains 92g / L sulfuric acid, 7.2g / L zinc sulfate and 325g / L sodium sulfate, the desulfurization bath contains 4.3g / L sodium sulfite, the bleaching bath contains 4.0g / L hydrogen peroxide, the oil bath concentration is 6.0g / L, and the drying temperature is 123℃), an antibacterial and antioxidant viscose fiber of 2.22dtex*56mm is made.
[0043] Performance Testing The DPPH method was used to detect the antioxidant properties of the viscose fibers prepared in Examples 1-3. The results are shown in Table 1. The antioxidant performance evaluation criteria are shown in Table 2. After washing 100 times, the DPPH method was used again to detect the antioxidant properties of the viscose fibers prepared in Examples 1-3. The viscose fibers prepared in Examples 1-3 were made into fabrics respectively, and 10 cm*10 cm samples were taken from each sample. The antibacterial rate of each sample against Staphylococcus aureus, Escherichia coli and Candida albicans was tested according to "GB / T 20994.3-2008 Evaluation of Antibacterial Properties of Textiles Part 3: Oscillation Method", and the results are shown in Table 3. After washing 100 times, the antibacterial rate of each sample against Staphylococcus aureus, Escherichia coli and Candida albicans was tested again according to "GB / T 20994.3-2008 Evaluation of Antibacterial Properties of Textiles Part 3: Oscillation Method", and the results are shown in Table 3.
[0044] Table 1 Antioxidant performance test results
[0045] Table 2 Evaluation criteria for antioxidant effect
[0046] Table 3 Antibacterial performance test results
[0047] As shown in Table 1 and Table 3, the antioxidant properties and antibacterial rates of the fabrics made of viscose fibers obtained in Examples 1-3 did not change significantly before and after washing. The results show that the present application uses lignified Radix Isatidis as the raw material of the hydrogel, uses the hydrogel to adsorb the perilla leaf extract with antioxidant efficacy and the Radix Isatidis extract with antibacterial efficacy to prepare a functional additive liquid, and adds the functional additive liquid to the spinning solution to prepare fibers, which can not only give the viscose fiber antibacterial and antioxidant efficacy, but also improve the durability of the antibacterial and antioxidant effects.
[0048] According to GB / T14463-2008 Viscose Staple Fibers, the dry breaking strength, wet breaking strength, dry breaking elongation, dry breaking strength variation coefficient and other indicators of the viscose fibers prepared in Examples 1-3 were tested. After testing, the dry breaking strength, wet breaking strength, dry breaking elongation, dry breaking strength variation coefficient and other indicators of the viscose fibers prepared in Examples 1-3 met the requirements of first-class products in GB / T14463-2008 Viscose Staple Fibers.
[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. A method for preparing antibacterial and antioxidant viscose fiber, characterized in that: The following steps are involved: S1. extracting the perilla leaves and the isatis root by alcohol extraction to obtain the perilla leaf extract and the isatis root extract; S2. The lignified isatis root stems were crushed, ball-milled, sieved, placed in an alkali solution, centrifuged, filtered, washed until neutral, dried, placed in a sodium hydroxide-urea aqueous solution, frozen, and dissolved at room temperature to obtain a hydrogel suspension; S3. Dissolving the perilla leaf extract and the isatis root extract separately to obtain a perilla leaf extract solution and a isatis root extract solution; Mixing the perilla leaf extract solution and the isatis root extract solution to obtain a mixed solution; adding a dispersant to the hydrogel suspension to obtain a premixed solution; Mixing the premixed liquid with the mixed liquid to obtain a functional additive liquid; S4. adding the functional additive liquid into the viscose fiber spinning solution to prepare antibacterial and antioxidant viscose fiber.
2. The preparation method according to claim 1, characterized in that In step S1, the extraction of perilla leaves by alcohol extraction includes: crushing the perilla leaves, sieving and soaking in an ethanol solution, filtering, vacuuming and concentrating to dryness, and ball milling; And / or, in step S1, extracting the Radix Isatidis by alcohol extraction includes: crushing the Radix Isatidis, immersing it in an ethanol solution after screening, filtering, vacuum concentrating to dryness, and ball milling.
3. The preparation method according to claim 1, characterized in that: In step S2, the alkali solution is a sodium hydroxide solution; And / or, in step S2, the concentration of the alkali solution is 2wt%-5wt%.
4. The preparation method according to claim 1, characterized in that: In step S2, the temperature of the alkali solution is 40-50°C; And / or, in step S2, the mixture is placed in an alkaline solution for treatment for 3-5 hours.
5. The preparation method according to claim 1, characterized in that: In step S2, the drying temperature is 55-65°C, and the drying time is 7-9 hours.
6. The preparation method according to claim 1, characterized in that: In step S2, the temperature of the sodium hydroxide-urea aqueous solution is -8 to -12°C; And / or, in the sodium hydroxide-urea aqueous solution of step S2, the mass ratio of sodium hydroxide to urea is 6-8:14-16; and / or, in step S2, the mass ratio of the dried solid to the sodium hydroxide-urea aqueous solution is 1:18-21; And / or, in step S2, the freezing temperature is -16~-20°C, and the freezing time is 7-9h.
7. The preparation method according to claim 1, characterized in that: In step S3, the perilla leaf extract is dissolved in water at a temperature of 40-50° C.; and / or, in step S3, the mass ratio of the perilla leaf extract to the solvent used is 1:4-6; And / or, in step S3, using water at a temperature of 40-50° C. to dissolve the Radix Isatidis extract; And / or, in step S3, the mass ratio of the Radix Isatidis extract to the solvent used is 1:4-6.
8. The preparation method according to claim 1, characterized in that: In step S3, the volume ratio of the perilla leaf extract solution to the isatis root extract solution is 1:1-3; And / or, in step S3, the dispersant is selected from at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate; And / or, in the premixed solution of step S3, the concentration of the dispersant is 0.5wt%-2.0wt%; And / or, in the functional additive liquid in step S3, the concentration of the perilla leaf extract is 3wt%-6wt%.
9. The antibacterial and antioxidant viscose fiber prepared according to the method described in any one of claims 1 to 8.
10. Use of the antibacterial and antioxidant viscose fiber according to claim 9 in bedding, wadding filling, clothing and medical supplies.