Moisturizing antibacterial regenerated cellulose fiber and method for producing the same

Abstract

The application provides a moisturizing and antibacterial regenerated cellulose fiber and a preparation method thereof. The preparation method of the moisturizing and antibacterial regenerated cellulose fiber comprises the following steps: S1, adding a fatty alcohol polyoxyethylene ether into water, stirring to obtain an emulsifier dispersion liquid; S2, adding konjac glucomannan, tea polyphenol and the emulsifier dispersion liquid into water to obtain an aqueous phase; adding dimethyl acrylate into butyl acetate to obtain an oil phase; adding the aqueous phase into the oil phase, and shearing to obtain an emulsion; S3, adding a sodium persulfate aqueous solution and a sodium metabisulfite aqueous solution into the emulsion, performing a reaction in a protective gas atmosphere, and drying to obtain microcapsules; and S4, adding the microcapsules into a regenerated cellulose fiber spinning dope to obtain a spinning solution; using water as a coagulating bath, performing wet spinning on the spinning solution, drafting, heat setting, and obtaining the moisturizing and antibacterial regenerated cellulose fiber. The application can endow the regenerated cellulose fiber with skin moisturizing and antibacterial effects.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a moisturizing and antibacterial regenerated cellulose fiber and its preparation method. Background Technology

[0002] Regenerated cellulose fiber is a cellulose fiber made from natural cellulose (such as cotton pulp, bamboo pulp, and wood pulp) without altering its chemical structure, only its physical structure. The structure of regenerated cellulose fiber is similar to that of natural fibers like cotton, but its moisture absorption and breathability are superior. Regenerated cellulose fiber exhibits excellent dyeing properties, a soft, full, and smooth hand feel, and excellent drape; it also boasts high thermal and light stability and does not generate static electricity. Regenerated cellulose fiber can be spun purely or blended with other fibers, producing fabrics that are soft, smooth, and breathable. After dyeing, the colors are vibrant and have good colorfastness, making it widely used in home textiles, clothing, and other fields.

[0003] With the improvement of living standards and the enhancement of health awareness, people's demand for textiles is no longer limited to covering and keeping warm, but focuses more on their functionality, such as moisture wicking, antibacterial and deodorizing, and skin care and health care.

[0004] However, regenerated cellulose fibers do not possess antibacterial or moisturizing properties, which limits their application in high-value-added products. Summary of the Invention

[0005] This application provides a moisturizing and antibacterial regenerated cellulose fiber and its preparation method to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution of this application is as follows: This application provides a method for preparing moisturizing and antibacterial regenerated cellulose fiber, the method comprising the following steps: S1. Add fatty alcohol polyoxyethylene ether to water and stir to obtain an emulsifier dispersion; S2. Add konjac glucomannan, tea polyphenols, and the emulsifier dispersion to water to obtain an aqueous phase; Dimethacrylate was added to butyl acetate to obtain an oil phase; The aqueous phase is added to the oil phase, and the mixture is sheared to obtain an emulsion; S3. Add sodium persulfate aqueous solution and sodium metabisulfite aqueous solution to the emulsion, react under a protective gas atmosphere, and dry to obtain microcapsules; S4. Add the microcapsules to the regenerated cellulose fiber spinning solution to obtain the spinning solution; Using water as a coagulation bath, the spinning solution is wet-spun, drawn, and heat-set to obtain the moisturizing and antibacterial regenerated cellulose fiber.

[0007] In one embodiment of this application, in step S1, the mass ratio of the fatty alcohol polyoxyethylene ether to water is 2-5:100, preferably 3-5:100.

[0008] In one embodiment of this application, in step S2, the mass ratio of konjac glucomannan to water is 1-2:100, preferably 1.5-2:100.

[0009] In one embodiment of this application, in step S2, the mass ratio of tea polyphenols to water is 1-3:100, preferably 1.5-3:100.

[0010] In one embodiment of this application, step S2 satisfies at least one of the following requirements (1)-(4): (1) Based on the total mass of the konjac glucomannan and tea polyphenols, the mass of the fatty alcohol polyoxyethylene ether is 2%-5%, preferably 3%-5%; (2) The mass ratio of dimethacrylate to butyl acetate is 1-2:100, preferably 1.5-2:100; (3) Based on the total mass of the konjac glucomannan and tea polyphenols, the mass of the dimethacrylate is 30%-50%, preferably 40%-50%; (4) During the shearing process, the shearing rate is 8000rpm-9000rpm, preferably 8500rpm-9000rpm; the shearing time is 5min-8min, preferably 6min-8min.

[0011] In one embodiment of this application, step S3 satisfies at least one of the following requirements (5)-(9): (5) The mass ratio of sodium persulfate to sodium metabisulfite is 1:0.9-1.2, preferably 1:0.9-1.1; (6) The mass ratio of sodium persulfate to the dimethacrylate is 4-7:100, preferably 5-7:100; (7) The sodium persulfate aqueous solution contains 15%-20% sodium persulfate by mass, preferably 18%-20%; (8) The sodium metabisulfite aqueous solution contains 15%-20% sodium metabisulfite by mass, preferably 18%-20%; (9) During the reaction process, the temperature is 25℃-30℃, preferably 28℃-30℃; the reaction time is 2h-3h, preferably 2.5h-3h.

[0012] In one embodiment of this application, in step S4, the mass ratio of the microcapsule to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 3-5:100, preferably 4-5:100.

[0013] In one embodiment of this application, in step S4, the temperature of the coagulation bath is 10℃-15℃, preferably 10℃-12℃.

[0014] In one embodiment of this application, in step S4, the stretching temperature is 70℃-80℃, preferably 75℃-80℃; the stretching ratio is 3 times-5 times, preferably 4 times-5 times.

[0015] In one embodiment of this application, in step S4, the heat setting temperature is 110℃-115℃, preferably 112℃-115℃; the heat setting time is 60s-120s, preferably 90s-120s.

[0016] In one embodiment of this application, in step S4, methyl methacrylate-acrylonitrile copolymer is also added to the spinning solution.

[0017] In one embodiment of this application, in step S4, the mass ratio of the methyl methacrylate-acrylonitrile copolymer to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 2-5:100, preferably 3-5:100.

[0018] This application also provides a moisturizing and antibacterial regenerated cellulose fiber prepared according to the method described above.

[0019] The technical solution provided in this application has at least the following beneficial effects: In this application, a redox system formed by sodium persulfate and sodium metabisulfite is used as an initiator. During the oxidation reaction of sodium persulfate and sodium metabisulfite, free radicals are generated. Through the initiation of these free radicals, dimethacrylate undergoes a self-polymerization reaction, generating polydimethacrylate with good film-forming properties. Polydimethacrylate can encapsulate moisturizing konjac glucomannan and antibacterial tea polyphenols within it, forming microcapsules. Adding these microcapsules to the spinning solution of regenerated cellulose fibers for wet spinning imparts skin-care, moisturizing, and antibacterial effects to the fibers.

[0020] In this application, the methyl methacrylate-acrylonitrile copolymer has an amphiphilic structure. The methyl methacrylate units in its molecular chain can physically entangle with the polydimethacrylate (PDMA) wall material of the microcapsules, while the nitrile groups in the acrylonitrile units can form hydrogen bonds with the hydroxyl groups on the cellulose macromolecules. In other words, through the interaction between the methyl methacrylate-acrylonitrile copolymer, PMA, and cellulose, an interfacial transition layer can be constructed between the microcapsules and the cellulose matrix, reducing the interfacial tension between the microcapsules and the cellulose matrix. This allows the microcapsules to be firmly fixed inside the fiber matrix during wet spinning, reducing precipitation and loss due to phase separation, improving moisturizing and antibacterial effects, and enhancing the durability of these effects. Detailed Implementation

[0021] The technical solution of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] One embodiment of this application provides a method for preparing moisturizing and antibacterial regenerated cellulose fiber, comprising the following steps: S1. Add fatty alcohol polyoxyethylene ether to water and stir to obtain an emulsifier dispersion; S2. Add konjac glucomannan, tea polyphenols and emulsifier dispersion to water, stir, and obtain an aqueous phase; Dimethacrylate was added to butyl acetate and stirred to obtain the oil phase; The aqueous phase is added to the oil phase, and the mixture is sheared to obtain an emulsion. S3. Add sodium persulfate aqueous solution and sodium metabisulfite aqueous solution to the emulsion, react under a protective gas atmosphere, and dry to obtain microcapsules; S4. Microcapsules are added to the spinning solution of regenerated cellulose fibers to obtain the spinning solution; Using water as a coagulation bath, the spinning solution is wet-spun, drawn, and heat-set to obtain moisturizing and antibacterial regenerated cellulose fiber.

[0023] In this application, a redox system formed by sodium persulfate and sodium metabisulfite is used as an initiator. During the oxidation reaction between sodium persulfate and sodium metabisulfite, free radicals are generated. Through the initiation of these free radicals, dimethacrylate undergoes a self-polymerization reaction, generating polydimethacrylate with good film-forming properties. Polydimethacrylate can encapsulate moisturizing konjac glucomannan and antibacterial tea polyphenols within it, forming microcapsules. Adding these microcapsules to the spinning solution of regenerated cellulose fibers for wet spinning imparts skin-care, moisturizing, and antibacterial effects to the fibers.

[0024] In one embodiment of this application, in step S1, the mass ratio of fatty alcohol polyoxyethylene ether to water is 2-5:100, preferably 3-5:100.

[0025] In one embodiment of this application, in step S2, the mass ratio of konjac glucomannan to water is 1-2:100, preferably 1.5-2:100. The mass ratio of tea polyphenols to water is 1-3:100, preferably 1.5-3:100. Based on the total mass of konjac glucomannan and tea polyphenols, the mass of fatty alcohol polyoxyethylene ether is 2%-5%, preferably 3%-5%. In other words, the mass ratio of fatty alcohol polyoxyethylene ether to the total mass of the two (i.e., the total mass of konjac glucomannan and tea polyphenols) is 2-5:100, meaning the mass of fatty alcohol polyoxyethylene ether accounts for 2%-5% of the total mass of konjac glucomannan and tea polyphenols. The mass ratio of dimethacrylate to butyl acetate is 1-2:100, preferably 1.5-2:100. Based on the total mass of konjac glucomannan and tea polyphenols, the mass of dimethacrylate is 30%-50%, preferably 40%-50%, meaning that the mass of methacrylate accounts for 30%-50% of the total mass of konjac glucomannan and tea polyphenols. During the shearing process, the shearing rate is 8000rpm-9000rpm, preferably 8500rpm-9000rpm; the shearing time is 5min-8min, preferably 6min-8min.

[0026] In one embodiment of this application, in step S3, the mass ratio of sodium persulfate to sodium metabisulfite is 1:0.9-1.2, preferably 1:0.9-1.1. The mass ratio of sodium persulfate to dimethacrylate is 4-7:100, preferably 5-7:100. The mass percentage of sodium persulfate in the sodium persulfate aqueous solution is 15%-20%, preferably 18%-20%. The mass percentage of sodium metabisulfite in the sodium metabisulfite aqueous solution is 15%-20%, preferably 18%-20%. During the reaction, the temperature is 25℃-30℃, preferably 28℃-30℃; the reaction time is 2h-3h, preferably 2.5h-3h.

[0027] In one embodiment of this application, in step S4, the mass ratio of the microcapsules to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 3-5:100, preferably 4-5:100. The temperature of the coagulation bath is 10℃-15℃, preferably 10℃-12℃. The drawing temperature is 70℃-80℃, preferably 75℃-80℃; the drawing ratio is 3-5 times, preferably 4-5 times. The heat-setting temperature is 110℃-115℃, preferably 112℃-115℃; the heat-setting time is 60s-120s, preferably 90s-120s. Examples of regenerated cellulose fibers include viscose fiber, modal fiber, and lyocell fiber.

[0028] In another embodiment of this application, in step S4, methyl methacrylate-acrylonitrile copolymer is further added to the spinning solution. The mass ratio of methyl methacrylate-acrylonitrile copolymer to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 2-5:100, preferably 3-5:100.

[0029] In this application, the methyl methacrylate-acrylonitrile copolymer has an amphiphilic structure. The methyl methacrylate units in its molecular chain can physically entangle with the polydimethacrylate (PDMA) wall material of the microcapsules, while the nitrile groups in the acrylonitrile units can form hydrogen bonds with the hydroxyl groups on the cellulose macromolecules. In other words, through the interaction between the methyl methacrylate-acrylonitrile copolymer, PMA, and cellulose, an interfacial transition layer can be constructed between the microcapsules and the cellulose matrix, reducing the interfacial tension between the microcapsules and the cellulose matrix. This allows the microcapsules to be firmly fixed inside the fiber matrix during wet spinning, reducing precipitation and loss due to phase separation, improving moisturizing and antibacterial effects, and enhancing the durability of these effects.

[0030] Another embodiment of this application also provides a moisturizing and antibacterial regenerated cellulose fiber prepared according to the method described above.

[0031] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0032] Example 1 S1. Add fatty alcohol polyoxyethylene ether AEO-5 to deionized water, with a mass ratio of fatty alcohol polyoxyethylene ether AEO-5 to deionized water of 5:100, stir, and obtain an emulsifier dispersion. S2. Add konjac glucomannan, tea polyphenols and emulsifier dispersion to deionized water. The mass ratio of konjac glucomannan to deionized water is 1:100, the mass ratio of tea polyphenols to deionized water is 3:100, and the mass of fatty alcohol polyoxyethylene ether AEO-5 accounts for 5% of the total mass of konjac glucomannan and tea polyphenols. Stir to obtain an aqueous phase. Add dimethacrylate to butyl acetate, with a mass ratio of dimethacrylate to butyl acetate of 1:100, stir, and obtain the oil phase; The aqueous phase was slowly added to the oil phase, and the mass of dimethacrylate accounted for 50% of the total mass of konjac glucomannan and tea polyphenols. The emulsion was sheared at a shear rate of 8000 rpm for 8 min to obtain the emulsion. S3. Add a 20% sodium persulfate aqueous solution and a 20% sodium metabisulfite aqueous solution to the emulsion. The mass ratio of sodium persulfate to sodium metabisulfite is 1:0.9, and the mass ratio of sodium persulfate to dimethacrylate is 4:100. React in a nitrogen atmosphere for 2 hours at a reaction temperature of 30°C, and then air dry to obtain microcapsules. S4. Add cotton pulp to an aqueous solution of N-methyl-morpholine-N-oxide with a mass percentage of 50% to obtain a spinning solution with a cotton pulp mass percentage of 10%. Microcapsules were added to the spinning solution, with a mass ratio of microcapsules to cotton pulp of 3:100, to obtain the spinning solution; Using water at 15°C as a coagulation bath, the spinning solution was wet-spun, then stretched 3 times at 80°C, and then heat-set at 110°C for 120 seconds to obtain moisturizing and antibacterial lyocell fiber.

[0033] Example 2 S1. Add fatty alcohol polyoxyethylene ether AEO-5 to deionized water, with a mass ratio of fatty alcohol polyoxyethylene ether AEO-5 to deionized water of 2:100, stir, and obtain an emulsifier dispersion. S2. Add konjac glucomannan, tea polyphenols and emulsifier dispersion to deionized water. The mass ratio of konjac glucomannan to deionized water is 2:100, the mass ratio of tea polyphenols to deionized water is 1:100, and the mass of fatty alcohol polyoxyethylene ether AEO-5 accounts for 2% of the total mass of konjac glucomannan and tea polyphenols. Stir to obtain an aqueous phase. Dimethacrylate was added to butyl acetate at a mass ratio of 2:100, and the mixture was stirred to obtain an oil phase. The aqueous phase was slowly added to the oil phase, and the mass of dimethacrylate accounted for 30% of the total mass of konjac glucomannan and tea polyphenols. The emulsion was sheared at a shear rate of 9000 rpm for 5 min to obtain the emulsion. S3. Add a 15% sodium persulfate aqueous solution and a 15% sodium metabisulfite aqueous solution to the emulsion. The mass ratio of sodium persulfate to sodium metabisulfite is 1:1.2, and the mass ratio of sodium persulfate to dimethacrylate is 7:100. React in a nitrogen atmosphere for 3 hours at a reaction temperature of 25°C, and then air dry to obtain microcapsules. S4. The wood pulp is alkalized by soaking in a 5% sodium hydroxide solution with a sodium hydroxide to wood pulp weight ratio of 0.5:1 to obtain alkali cellulose. The alkali cellulose is aged at 18°C ​​for 8 hours. The aged alkali cellulose is xanthated and dissolved in a 5% sodium hydroxide solution, degassed, filtered, and a spinning solution with an esterification degree of 50 is obtained. Microcapsules were added to the spinning solution, with the mass ratio of microcapsules to cellulose xanthate in the spinning solution being 5:100, to obtain the spinning solution. Using water at 10℃ as a coagulation bath, the spinning solution was wet-spun, then stretched 5 times at 70℃, and then heat-set at 115℃ for 60 seconds to obtain moisturizing and antibacterial viscose fiber.

[0034] Example 3 S1. Add fatty alcohol polyoxyethylene ether AEO-5 to deionized water, with a mass ratio of fatty alcohol polyoxyethylene ether AEO-5 to deionized water of 4:100, stir, and obtain an emulsifier dispersion. S2. Add konjac glucomannan, tea polyphenols and emulsifier dispersion to deionized water. The mass ratio of konjac glucomannan to deionized water is 1.5:100, the mass ratio of tea polyphenols to deionized water is 2:100, and the mass of fatty alcohol polyoxyethylene ether AEO-5 accounts for 3% of the total mass of konjac glucomannan and tea polyphenols. Stir to obtain an aqueous phase. Dimethacrylate was added to butyl acetate at a mass ratio of 1.5:100, and the mixture was stirred to obtain an oil phase. The aqueous phase was slowly added to the oil phase, with the mass of dimethacrylate accounting for 40% of the total mass of konjac glucomannan and tea polyphenols. The emulsion was obtained by shearing at a shear rate of 8500 rpm for 6 min. S3. Add an aqueous solution of sodium persulfate with a mass percentage of 18% and an aqueous solution of sodium metabisulfite with a mass percentage of 18% to the emulsion. The mass ratio of sodium persulfate to sodium metabisulfite is 1:1, and the mass ratio of sodium persulfate to dimethacrylate is 6:100. React in a nitrogen atmosphere for 2.5 h at a reaction temperature of 28°C, and then air dry to obtain microcapsules. S4. Add cotton pulp to an aqueous solution of N-methyl-morpholine-N-oxide with a mass percentage of 50% to obtain a spinning solution with a cotton pulp mass percentage of 10%. Microcapsules were added to the spinning solution, with a mass ratio of microcapsules to cotton pulp of 4:100, to obtain the spinning solution; Using water at 12°C as a coagulation bath, the spinning solution was wet-spun, then stretched 4 times at 75°C, and then heat-set at 112°C for 90 seconds to obtain moisturizing and antibacterial lyocell fiber.

[0035] Example 4 Except for the following conditions, moisturizing and antibacterial lyocell fibers were prepared in the same manner as in Example 3: S4. Add cotton pulp to an aqueous solution of N-methyl-morpholine-N-oxide with a mass percentage of 50% to obtain a spinning solution with a cotton pulp mass percentage of 10%. Microcapsules and methyl methacrylate-acrylonitrile copolymer were added to the spinning solution. The mass ratio of microcapsules to cotton pulp was 4:100, and the mass ratio of methyl methacrylate-acrylonitrile copolymer to cotton pulp was 2:100. The spinning solution was obtained by wet spinning with water at 12°C as the coagulation bath. Then, it was stretched 4 times at 75°C and heat-set at 112°C for 90 seconds to obtain moisturizing and antibacterial lyocell fiber.

[0036] The difference between this embodiment and Example 3 is that methyl methacrylate-acrylonitrile copolymer is also added to the spinning solution, and the mass ratio of methyl methacrylate-acrylonitrile copolymer to cotton pulp is 2:100.

[0037] Example 5 Except for the following conditions, moisturizing and antibacterial lyocell fibers were prepared in the same manner as in Example 3: S4. Add cotton pulp to an aqueous solution of N-methyl-morpholine-N-oxide with a mass percentage of 50% to obtain a spinning solution with a cotton pulp mass percentage of 10%. Microcapsules and methyl methacrylate-acrylonitrile copolymer were added to the spinning solution. The mass ratio of microcapsules to cotton pulp was 4:100, and the mass ratio of methyl methacrylate-acrylonitrile copolymer to cotton pulp was 5:100, thus obtaining the spinning solution. Using water at 12°C as a coagulation bath, the spinning solution was wet-spun, then stretched 4 times at 75°C, and then heat-set at 112°C for 90 seconds to obtain moisturizing and antibacterial lyocell fiber.

[0038] The difference between this embodiment and Example 3 is that methyl methacrylate-acrylonitrile copolymer is also added to the spinning solution, and the mass ratio of methyl methacrylate-acrylonitrile copolymer to cotton pulp is 5:100.

[0039] Comparative Example 1 Lyocell fibers were prepared in the same manner as in Example 3, except for the following conditions: S4. Add cotton pulp to an aqueous solution of N-methyl-morpholine-N-oxide with a mass percentage of 50% to obtain a spinning solution with a cotton pulp mass percentage of 10%. Using water at 12°C as a coagulation bath, the spinning solution was wet-spun, then stretched 4 times at 75°C, and then heat-set at 112°C for 90 seconds to obtain Lyocell fiber.

[0040] The difference between this comparative example and Example 3 is that no microcapsules were added to the spinning solution.

[0041] Performance testing The fibers obtained in Examples 1-5 and Comparative Example 1 were processed into fabrics using the same process; The inhibition rates of each fabric against Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 11229) were tested according to GB / T 20944.3-2008 Evaluation of antimicrobial properties of textiles - Part 3: Shaking method. The results are shown in Table 1. The moisture regain of each fabric was tested according to GB / T 9995-1997 Determination of Moisture Content and Moisture Regain of Textile Materials by Oven Drying Method. The results are shown in Table 1. Each fabric was machine washed at room temperature for 10 minutes, spun dry at 650 rpm for 6 minutes, and then air-dried. The process was repeated 20 times. The moisture absorption and antibacterial rate against Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 11229) were then tested again using the same method. The results are shown in Tables 1 and 2.

[0042] Table 1 Results of moisture regain test

[0043] Table 2 Results of antibacterial rate test

[0044] As shown in Tables 1 and 2, compared with Comparative Example 1 (without microcapsules added to the spinning solution), the fabric processed from lyocell fibers prepared in Example 3 (with microcapsules added to the spinning solution) exhibited significantly improved moisture regain and antibacterial rate. This result indicates that, in this application, using konjac glucomannan and tea polyphenols as core materials and a copolymer of dimethacrylate (i.e., polydimethacrylate) as wall material to prepare microcapsules, and then adding these microcapsules to the spinning solution for wet spinning, can impart skin-care, moisturizing, and antibacterial effects to the fibers.

[0045] As shown in Tables 1 and 2, compared with Example 3 (spinning solution without methyl methacrylate-acrylonitrile copolymer), the fabrics made from lyocell fibers prepared in Examples 4 (spinning solution with methyl methacrylate-acrylonitrile copolymer) and 5 (spinning solution with methyl methacrylate-acrylonitrile copolymer) exhibited significantly improved moisture regain and antibacterial rates. Furthermore, after washing, the moisture regain and antibacterial rate of the fabrics made from lyocell fibers prepared in Example 3 (spinning solution without methyl methacrylate-acrylonitrile copolymer) decreased slightly, while the moisture regain and antibacterial rate of the fabrics made from lyocell fibers prepared in Examples 4 (spinning solution with methyl methacrylate-acrylonitrile copolymer) and 5 (spinning solution with methyl methacrylate-acrylonitrile copolymer) showed no significant changes. These results indicate that, in this application, adding methyl methacrylate-acrylonitrile copolymer to the regenerated cellulose fiber spinning solution can improve the moisturizing properties, antibacterial effect, and the durability of the moisturizing and antibacterial effects.

[0046] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for preparing a moisturizing and antibacterial regenerated cellulose fiber, characterized in that, The preparation method includes the following steps: S1. Add fatty alcohol polyoxyethylene ether to water and stir to obtain an emulsifier dispersion; S2. Add konjac glucomannan, tea polyphenols, and the emulsifier dispersion to water to obtain an aqueous phase; Dimethacrylate was added to butyl acetate to obtain an oil phase; The aqueous phase is added to the oil phase, and the mixture is sheared to obtain an emulsion; S3. Add sodium persulfate aqueous solution and sodium metabisulfite aqueous solution to the emulsion, react under a protective gas atmosphere, and dry to obtain microcapsules; S4. Add the microcapsules to the regenerated cellulose fiber spinning solution to obtain the spinning solution; Using water as a coagulation bath, the spinning solution is wet-spun, drawn, and heat-set to obtain the moisturizing and antibacterial regenerated cellulose fiber.

2. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, In step S1, the mass ratio of the fatty alcohol polyoxyethylene ether to water is 2-5:

100.

3. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, In step S2, the mass ratio of konjac glucomannan to water is 1-2:100; And / or, in step S2, the mass ratio of tea polyphenols to water is 1-3:

100.

4. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, Step S2 satisfies at least one of the following requirements (1)-(4): (1) Based on the total mass of the konjac glucomannan and tea polyphenols, the mass of the fatty alcohol polyoxyethylene ether is 2%-5%; (2) The mass ratio of the dimethacrylate to the butyl acetate is 1-2:100; (3) Based on the total mass of the konjac glucomannan and tea polyphenols, the mass of the dimethacrylate is 30%-50%; (4) During the shearing process, the shearing rate is 8000rpm-9000rpm and the shearing time is 5min-8min.

5. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, Step S3 satisfies at least one of the following requirements (5)-(9): (5) The mass ratio of sodium persulfate to sodium metabisulfite is 1:0.9-1.2; (6) The mass ratio of sodium persulfate to the dimethacrylate is 4-7:100; (7) The sodium persulfate aqueous solution contains 15%-20% sodium persulfate by mass; (8) The sodium metabisulfite aqueous solution contains 15%-20% sodium metabisulfite by mass; (9) During the reaction, the temperature is 25℃-30℃ and the reaction time is 2h-3h.

6. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, In step S4, the mass ratio of the microcapsules to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 3-5:100; And / or, in step S4, the temperature of the coagulation bath is 10℃-15℃.

7. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1 or 6, characterized in that, In step S4, the stretching temperature is 70℃-80℃, and the stretching ratio is 3-5 times. And / or, in step S4, the heat setting temperature is 110℃-115℃, and the heat setting time is 60s-120s.

8. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 1, characterized in that, In step S4, methyl methacrylate-acrylonitrile copolymer is also added to the spinning solution.

9. The method for preparing moisturizing and antibacterial regenerated cellulose fiber as described in claim 8, characterized in that, In step S4, the mass ratio of the methyl methacrylate-acrylonitrile copolymer to the fiber-forming matrix in the regenerated cellulose fiber spinning solution is 2-5:

100.

10. A moisturizing, antibacterial, regenerated cellulose fiber prepared according to any one of claims 1-9.

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