A vitamin fiber and a method for preparing the same

Abstract

The present application provides a kind of vitamin fiber and its preparation method, the preparation method includes the carboxylation of beta-cyclodextrin, modification of vitamin E, preparation of microcapsule, blending and spinning.The present application improves the stability of vitamin E by modifying vitamin E and protecting the phenolic hydroxyl group in vitamin E.The modified vitamin E retains the characteristics of skin care and moisturizing of vitamin, and has the properties of beta-cyclodextrin, which can be used as a capsule wall material to coat vitamin B and vitamin C as water-soluble vitamins to make composite vitamin microcapsules.The microcapsules have good compatibility with the fiber, avoiding the phenomenon of mechanical property reduction of the fiber, and avoiding the loss of vitamins caused by the destruction of alkaline, high temperature and other conditions during the spinning process, while the three vitamins stably coexist in the fiber, prolonging the release period.

Description

Technical Field

[0001] This invention belongs to the field of cellulose fiber technology, specifically relating to a vitamin fiber and its preparation method. Background Technology

[0002] Cellulose fiber is a type of man-made fiber with advantages such as good moisture absorption, ease of dyeing, and low static electricity, making it widely used in clothing, textiles, and other fields. Acetate fiber and cuprammonium fiber are also fibers prepared from natural cellulose through modification, and they have even better properties than viscose fiber, leading to their wider application. With the rapid development of society and the economy, people's demands and requirements for textiles are constantly being updated and improved, gradually leading to a pursuit of more environmentally friendly, more functional, and higher-quality fiber fabrics.

[0003] Vitamins are essential elements for the human body, including vitamin E, vitamin C, and B vitamins. Vitamin E (VE), also known as tocopherol, is one of the earliest discovered vitamins. It is a fat-soluble vitamin widely found in the animal and plant kingdoms, especially in wheat germ oil, corn oil, and soybean oil. It is also a powerful free radical scavenger and antioxidant, which can delay aging, effectively reduce wrinkles, and moisturize the skin. Vitamin C, also known as ascorbic acid, is a water-soluble vitamin, abundant in fresh vegetables and certain fruits, and can enhance the skin's antioxidant capacity. B vitamins are also water-soluble vitamins, widely found in rice bran, wheat bran, yeast, animal liver, whole grains, and vegetables, and have anti-allergic and anti-inflammatory effects. Adding vitamins to fiber can provide skin moisturizing, anti-allergic, and anti-inflammatory benefits, making it suitable for people with sensitive skin. However, vitamins are easily oxidized in high-temperature, acidic, or alkaline environments, limiting their application in fiber.

[0004] Patent number "CN201110104832.4" entitled "A Method for Preparing Vitamin E Fiber" proposes a method for producing vitamin E fiber by encapsulating vitamin E in microcapsules and adding it to a spinning solution. However, vitamin E is a fat-soluble vitamin, while vitamins B and C are water-soluble vitamins. Mixing these three vitamins can easily lead to uneven distribution due to their immiscibility, making it difficult to encapsulate them in microcapsules and thus hindering the effective release of their benefits. Furthermore, existing technologies rarely employ methods that simultaneously incorporate all three vitamins into the fiber for synergistic effects. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a vitamin fiber and its preparation method, achieving the following objectives:

[0006] 1. To address the uneven distribution of vitamin E, vitamin B, and vitamin C when they coexist, modified vitamin E is used as the capsule wall material to encapsulate vitamin B and vitamin C into microcapsules, which are then added to fiber to achieve stable coexistence and synergistic effects of vitamin E, vitamin B, and vitamin C.

[0007] 2. Since vitamin E is unstable in an alkaline environment, and spinning solutions are usually alkaline, vitamin E is modified to improve its stability in spinning solutions and avoid being destroyed and lost in large quantities during the spinning process.

[0008] To address the above technical problems, one of the objectives of this invention is to provide a vitamin fiber containing vitamin E, vitamin B, and vitamin C.

[0009] The second objective of this invention is to provide a method for preparing vitamin fiber, comprising the following steps:

[0010] Carboxylation of S1 and β-cyclodextrin

[0011] β-Cyclodextrin was added to a 10-16% NaOH solution and stirred until dissolved. The temperature was then raised to 70-80℃, and chloroacetic acid solution was slowly added. The mixture was sonicated for 50-70 minutes at a frequency of 90-150 kHz. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to 5-6. Anhydrous ethanol was added for separation, and the filtrate was concentrated to 30% under reduced pressure. Anhydrous methanol was added and the mixture was allowed to stand for 12-18 hours. The mixture was then filtered and dried to obtain carboxymethyl-β-cyclodextrin.

[0012] Preferably, the concentration of the chloroacetic acid solution is 7-10%, and the mass ratio of chloroacetic acid to β-cyclodextrin in the chloroacetic acid solution is 1:2-3.

[0013] Preferably, the amount of anhydrous methanol added is 3-5 times that of the filtrate.

[0014] S2, Modification of Vitamin E

[0015] Vitamin E was placed in a reaction vessel, and dimethylacetamide was added and stirred until homogeneous. The temperature was raised to 40-50℃, and then carboxymethyl-β-cyclodextrin and catalyst were added and stirred for 4-6 hours at a stirring rate of 80-120 r / min. The phenolic hydroxyl group on the benzodihydropyran parent ring of vitamin E was connected to the carboxymethyl group on the carboxymethyl-β-cyclodextrin through an ester bond. After the reaction was completed, deionized water was added, and the product was washed with 1-2% acetic acid solution and saturated NaCl solution. After drying, modified vitamin E was obtained.

[0016] Preferably, the vitamin E is an oily liquid with an active ingredient content of 99.9%.

[0017] Preferably, the amount of dimethylacetamide added is 3-6 times the volume of vitamin E.

[0018] Preferably, the mass ratio of carboxymethyl-β-cyclodextrin to vitamin E is 5-12:1-2; and the amount of catalyst added is 3-7% of vitamin E.

[0019] Furthermore, the catalyst comprises N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine, wherein the molar ratio of N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine is 2-5:1.

[0020] S3, Preparation of Microcapsules

[0021] Modified vitamin E was added to an aqueous ethanol solution with a volume fraction of 75-90%, and stirred at 40-50°C for 10-15 minutes. Then, fatty alcohol polyoxyethylene ether ammonium sulfate was added and stirred for 20-30 minutes. Next, a mixed solution of vitamin B and vitamin C was added, and stirring was continued for 1-2 hours. After cooling to room temperature, the mixture was allowed to stand for 12-24 hours. After washing and drying, the compound vitamin microcapsules were obtained.

[0022] Preferably, the mass ratio of the modified vitamin E to the aqueous ethanol solution is 1-5:15-20; and the amount of fatty alcohol polyoxyethylene ether ammonium sulfate added is 0.6-1.2% of the modified vitamin E.

[0023] Preferably, the mixed solution of vitamin B and vitamin C comprises vitamin B, vitamin C and deionized water, wherein the mass ratio of vitamin B, vitamin C and deionized water is 1-2:4-5:20-30.

[0024] Preferably, the ratio of the mass of the modified vitamin E to the total mass of vitamins B and C is 3-6:1.

[0025] S4, blending

[0026] Add compound vitamin microcapsules and sodium dodecylbenzenesulfonate to the spinning solution and mix for 15-20 minutes to obtain vitamin spinning solution.

[0027] Preferably, the amount of the compound vitamin microcapsules added is 2-4% of the mass of the spinning solution, and the amount of sodium dodecylbenzenesulfonate added is 0.5-0.8% of the mass of the compound vitamin microcapsules.

[0028] Preferably, the spinning solution is one of viscose fiber spinning solution, cellulose acetate spinning solution, cuprammonium cellulose spinning solution, etc.

[0029] S5, spinning

[0030] The vitamin spinning solution is extruded from a nozzle and passed through a coagulation bath to obtain nascent fiber bundles. After post-treatment processes such as stretching, washing, oiling, and drying, the vitamin fiber prepared in this invention is obtained.

[0031] By adopting the above technical solution, the technical effect achieved by this invention is as follows:

[0032] 1. The vitamin fiber prepared by this invention has good mechanical properties, which are basically no less than those of commercially available fibers. It has excellent moisture absorption properties, and the three vitamins coexist stably and work synergistically to exert their effects. The total loss rate of vitamins during the preparation process is less than 1%.

[0033] 2. Because vitamin E has phenolic hydroxyl groups on the benzodihydropyran parent ring, these hydroxyl groups are linked to the carboxymethyl group on carboxymethyl-β-cyclodextrin via ester bonds under the action of a catalyst. This protects the phenolic hydroxyl groups in vitamin E, improves its stability, and prevents them from being destroyed or lost during the spinning process by alkaline conditions, high temperatures, etc.

[0034] 3. The modified vitamin E retains the skin-care and moisturizing characteristics of vitamins while also possessing the properties of β-cyclodextrin. It can be used as a capsule wall material to encapsulate water-soluble vitamins B and C to form complex vitamin microcapsules. These microcapsules have good compatibility with fibers, and vitamin E, vitamin B, and vitamin C are evenly distributed in the fibers, avoiding the phenomenon of decreased fiber mechanical properties.

[0035] 4. When the vitamin fiber prepared according to this invention is made into fabric and worn, since human sweat has a pH of 4.5-5.5 and is weakly acidic, the modified vitamin E in the complex vitamin microcapsules can slowly hydrolyze and release free vitamin E when the body sweats. This free vitamin E, along with the slow-released vitamin B and vitamin C, works synergistically with the body to provide skin care, moisturizing, anti-allergy, and anti-inflammatory effects. In a study of 500 people with sensitive skin who wore fabric made from this fiber for 10 days, no redness, swelling, or itching was observed. Furthermore, the dryness symptoms of those with dry skin were effectively relieved, indicating that this fiber does not irritate the skin and has skin care and moisturizing effects, making it suitable for sensitive skin.

[0036] 5. According to testing, the sustained-release period of the vitamin active ingredients in this fiber is 1.7-2 years. Detailed Implementation

[0037] The present invention will be further illustrated below with reference to specific embodiments.

[0038] Example 1: A vitamin fiber and its preparation method, comprising the following steps:

[0039] Carboxylation of S1 and β-cyclodextrin

[0040] β-Cyclodextrin was added to a 12% NaOH solution and stirred until dissolved. The temperature was then raised to 75°C, and chloroacetic acid solution was slowly added. The mixture was sonicated for 60 minutes at a frequency of 110 kHz. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to 5. Anhydrous ethanol was added for separation. The filtrate was concentrated to 30% under reduced pressure, and anhydrous methanol was added. The mixture was left to stand for 18 hours, filtered, and dried to obtain carboxymethyl-β-cyclodextrin.

[0041] The concentration of the chloroacetic acid solution is 8%, and the mass ratio of chloroacetic acid to β-cyclodextrin in the chloroacetic acid solution is 1:2.

[0042] The amount of anhydrous methanol added is 4 times that of the filtrate.

[0043] S2, Modification of Vitamin E

[0044] Vitamin E was placed in a reaction vessel, and dimethylacetamide was added and stirred until homogeneous. The mixture was heated to 46°C, and then carboxymethyl-β-cyclodextrin and a catalyst were added and stirred for 5 hours at a stirring rate of 100 r / min. The phenolic hydroxyl group on the benzodihydropyran parent ring of vitamin E was connected to the carboxymethyl group on the carboxymethyl-β-cyclodextrin via an ester bond. After the reaction was completed, deionized water was added, and the product was washed with a 2% acetic acid solution and a saturated NaCl solution. After drying, modified vitamin E was obtained.

[0045] The vitamin E is an oily liquid with an active ingredient content of 99.9%.

[0046] The amount of dimethylacetamide added is 5 times the volume of vitamin E.

[0047] The mass ratio of carboxymethyl-β-cyclodextrin to vitamin E is 8:1; the amount of catalyst added is 5% of vitamin E.

[0048] The catalyst comprises N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine, wherein the molar ratio of N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine is 4:1.

[0049] S3, Preparation of Microcapsules

[0050] Modified vitamin E was added to an 80% (v / v) aqueous ethanol solution and stirred at 45°C for 15 min. Then, fatty alcohol polyoxyethylene ether ammonium sulfate was added and stirred for 25 min. Next, a mixed solution of vitamin B and vitamin C was added and stirred for 2 h. After cooling to room temperature, the mixture was allowed to stand for 20 h. After washing and drying, the compound vitamin microcapsules were obtained.

[0051] The mass ratio of the modified vitamin E to the aqueous ethanol solution is 3:18; the amount of fatty alcohol polyoxyethylene ether ammonium sulfate added is 1.0% of the modified vitamin E.

[0052] The mixed solution of vitamin B and vitamin C comprises vitamin B, vitamin C and deionized water, wherein the mass ratio of vitamin B, vitamin C and deionized water is 2:5:30.

[0053] The ratio of the mass of the modified vitamin E to the total mass of vitamins B and C is 5:1.

[0054] S4, blending

[0055] Add compound vitamin microcapsules and sodium dodecylbenzene sulfonate to the viscose fiber spinning solution and mix for 15-20 minutes to obtain vitamin spinning solution.

[0056] The amount of the compound vitamin microcapsules added is 3% of the mass of the viscose fiber spinning solution, and the amount of sodium dodecylbenzenesulfonate added is 0.6% of the mass of the compound vitamin microcapsules.

[0057] S5, spinning

[0058] The vitamin spinning solution is extruded from a nozzle and passed through a coagulation bath to obtain nascent fiber bundles. After post-treatment processes such as stretching, washing, oiling, and drying, the vitamin fiber prepared in this invention is obtained.

[0059] Example 2: A vitamin fiber and its preparation method, comprising the following steps:

[0060] Carboxylation of S1 and β-cyclodextrin

[0061] β-Cyclodextrin was added to a 10% NaOH solution and stirred until dissolved. The temperature was then raised to 70°C, and chloroacetic acid solution was slowly added. The mixture was sonicated for 50 minutes at a frequency of 90 kHz. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to 6. Anhydrous ethanol was added for separation. The filtrate was concentrated to 30% under reduced pressure, and anhydrous methanol was added. The mixture was left to stand for 12 hours, filtered, and dried to obtain carboxymethyl-β-cyclodextrin.

[0062] The concentration of the chloroacetic acid solution is 7%, and the mass ratio of chloroacetic acid to β-cyclodextrin in the chloroacetic acid solution is 1:3.

[0063] The amount of anhydrous methanol added is three times that of the filtrate.

[0064] S2, Modification of Vitamin E

[0065] Vitamin E was placed in a reaction vessel, and dimethylacetamide was added and stirred until homogeneous. The mixture was heated to 40°C, and then carboxymethyl-β-cyclodextrin and a catalyst were added and stirred for 4 hours at a stirring rate of 80 r / min. The phenolic hydroxyl group on the benzodihydropyran parent ring of vitamin E was connected to the carboxymethyl group on the carboxymethyl-β-cyclodextrin via an ester bond. After the reaction was completed, deionized water was added, and the product was washed with a 1% acetic acid solution and a saturated NaCl solution. After drying, modified vitamin E was obtained.

[0066] The vitamin E is an oily liquid with an active ingredient content of 99.9%.

[0067] The amount of dimethylacetamide added is three times the volume of vitamin E.

[0068] The mass ratio of carboxymethyl-β-cyclodextrin to vitamin E is 5:1; the amount of catalyst added is 3% of vitamin E.

[0069] The catalyst comprises N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine, wherein the molar ratio of N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine is 2:1.

[0070] S3, Preparation of Microcapsules

[0071] Modified vitamin E was added to a 75% (v / v) aqueous ethanol solution and stirred at 40°C for 10 min. Then, fatty alcohol polyoxyethylene ether ammonium sulfate was added and stirred for 20 min. Next, a mixed solution of vitamin B and vitamin C was added and stirred for 1 h. After cooling to room temperature, the mixture was allowed to stand for 12 h. After washing and drying, the compound vitamin microcapsules were obtained.

[0072] The mass ratio of the modified vitamin E to the aqueous ethanol solution is 1:15; the amount of fatty alcohol polyoxyethylene ether ammonium sulfate added is 0.6% of the modified vitamin E.

[0073] The mixed solution of vitamin B and vitamin C includes vitamin B, vitamin C and deionized water, wherein the mass ratio of vitamin B, vitamin C and deionized water is 1:4:20.

[0074] The ratio of the mass of the modified vitamin E to the total mass of vitamins B and C is 3:1.

[0075] S4, blending

[0076] Add compound vitamin microcapsules and sodium dodecylbenzenesulfonate to the viscose fiber spinning solution and mix for 15 minutes to obtain vitamin spinning solution.

[0077] The amount of the compound vitamin microcapsules added is 2% of the mass of the viscose fiber spinning solution, and the amount of sodium dodecylbenzenesulfonate added is 0.5% of the mass of the compound vitamin microcapsules.

[0078] S5, spinning

[0079] The vitamin spinning solution is extruded from a nozzle and passed through a coagulation bath to obtain nascent fiber bundles. After post-treatment processes such as stretching, washing, oiling, and drying, the vitamin fiber prepared in this invention is obtained.

[0080] Example 3: A vitamin fiber and its preparation method, comprising the following steps:

[0081] Carboxylation of S1 and β-cyclodextrin

[0082] β-Cyclodextrin was added to a 16% NaOH solution and stirred until dissolved. The temperature was then raised to 80°C, and chloroacetic acid solution was slowly added. The mixture was sonicated for 70 minutes at a frequency of 150 kHz. After the reaction was completed, the mixture was cooled to room temperature, and the pH was adjusted to 5. Anhydrous ethanol was added for separation. The filtrate was concentrated to 30% under reduced pressure, and anhydrous methanol was added. The mixture was left to stand for 15 hours, filtered, and dried to obtain carboxymethyl-β-cyclodextrin.

[0083] The concentration of the chloroacetic acid solution is 10%, and the mass ratio of chloroacetic acid to β-cyclodextrin in the chloroacetic acid solution is 1:3.

[0084] The amount of anhydrous methanol added is 5 times that of the filtrate.

[0085] S2, Modification of Vitamin E

[0086] Vitamin E was placed in a reaction vessel, and dimethylacetamide was added and stirred until homogeneous. The mixture was heated to 50°C, and then carboxymethyl-β-cyclodextrin and a catalyst were added and stirred for 6 hours at a stirring rate of 120 r / min. The phenolic hydroxyl group on the benzodihydropyran parent ring of vitamin E was connected to the carboxymethyl group on the carboxymethyl-β-cyclodextrin via an ester bond. After the reaction was completed, deionized water was added, and the product was washed with a 2% acetic acid solution and a saturated NaCl solution. After drying, modified vitamin E was obtained.

[0087] The vitamin E is an oily liquid with an active ingredient content of 99.9%.

[0088] The amount of dimethylacetamide added is 6 times the volume of vitamin E.

[0089] The mass ratio of carboxymethyl-β-cyclodextrin to vitamin E is 12:2; the amount of catalyst added is 7% of vitamin E.

[0090] The catalyst comprises N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine, wherein the molar ratio of N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine is 5:1.

[0091] S3, Preparation of Microcapsules

[0092] Modified vitamin E was added to a 90% (v / v) aqueous ethanol solution and stirred at 50°C for 15 min. Then, fatty alcohol polyoxyethylene ether ammonium sulfate was added and stirred for 30 min. Next, a mixed solution of vitamin B and vitamin C was added and stirred for 1.5 h. After cooling to room temperature, the mixture was allowed to stand for 24 h. After washing and drying, the compound vitamin microcapsules were obtained.

[0093] The mass ratio of the modified vitamin E to the aqueous ethanol solution is 5:20; the amount of fatty alcohol polyoxyethylene ether ammonium sulfate added is 1.2% of the modified vitamin E.

[0094] The mixed solution of vitamin B and vitamin C includes vitamin B, vitamin C and deionized water, wherein the mass ratio of vitamin B, vitamin C and deionized water is 1:5:25.

[0095] The ratio of the mass of the modified vitamin E to the total mass of vitamins B and C is 6:1.

[0096] S4, blending

[0097] Add compound vitamin microcapsules and sodium dodecylbenzene sulfonate to the viscose fiber spinning solution and mix for 20 minutes to obtain vitamin spinning solution.

[0098] The amount of the compound vitamin microcapsules added is 4% of the mass of the viscose fiber spinning solution, and the amount of sodium dodecylbenzenesulfonate added is 0.8% of the mass of the compound vitamin microcapsules.

[0099] S5, spinning

[0100] The vitamin spinning solution is extruded from a nozzle and passed through a coagulation bath to obtain nascent fiber bundles. After post-treatment processes such as stretching, washing, oiling, and drying, the vitamin fiber prepared in this invention is obtained.

[0101] Table 1 shows the product performance of vitamin fiber in Examples 1-3.

[0102]

[0103] Table 1 shows that the vitamin fiber prepared by this invention has good mechanical properties, which are basically no less than those of commercially available fibers. It also has excellent moisture absorption properties, and the three vitamins coexist stably and work synergistically to exert their effects. The total loss rate of vitamins during the preparation process is less than 1%.

[0104] In a study of 500 people with sensitive skin, none of them experienced redness, swelling, or itching after wearing the fabric made from this fiber for 10 days. In fact, the dryness symptoms of some individuals with dry skin were effectively relieved. This indicates that the fiber does not irritate the skin and has moisturizing effects, making it suitable for sensitive skin.

[0105] Comparative Example 1

[0106] Example 1, a representative example, was selected. The compound vitamin microcapsules were removed, and equal amounts of vitamins E, B, and C were directly added to the spinning solution for blending. All other aspects remained the same as in Example 1, serving as Comparative Example 1. The vitamin fiber prepared using Comparative Example 1 had a dry strength of 1.43 cN / dtex and a wet strength of 0.82 cN / dtex, showing a significant decrease in mechanical properties. Testing revealed uneven distribution of vitamins E, B, and C within the fiber. This was attributed to some vitamin E adhering to the surface of vitamins B and C during blending, resulting in uneven distribution in the spinning solution and thus affecting the fiber's mechanical properties. Further testing showed that vitamins were significantly affected by acidity, alkali, and temperature during the preparation process, with a total vitamin loss rate of 44%.

[0107] This invention modifies vitamin E and then uses it as the capsule wall material to encapsulate water-soluble vitamins B and C into composite vitamin microcapsules. These microcapsules have good compatibility with fibers, and vitamins E, B, and C are evenly distributed in the fibers, avoiding the decline in the mechanical properties of the fibers and preventing the vitamins from being destroyed or lost during the spinning process due to alkaline conditions, high temperatures, etc. At the same time, the three vitamins coexist stably in the fibers, prolonging the sustained-release period.

[0108] Unless otherwise specified, all proportions and percentages mentioned in this invention are mass proportions and mass percentages; all raw materials are commercially available.

[0109] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vitamin fiber, characterized in that, The vitamin fiber contains vitamin E, vitamin B, and vitamin C; The method for preparing the vitamin fiber includes carboxylation of β-cyclodextrin, modification of vitamin E, preparation of microcapsules, blending and spinning. The carboxylation of β-cyclodextrin is performed by adding β-cyclodextrin to a 10-16% NaOH solution and stirring until dissolved. Then, the temperature is raised to 70-80℃, and chloroacetic acid solution is slowly added. The mixture is ultrasonically reacted for 50-70 minutes at a frequency of 90-150kHz. After the reaction is completed, the mixture is cooled to room temperature, the pH is adjusted to 5-6, and anhydrous ethanol is added for separation. The filtrate is concentrated to 30% under reduced pressure, anhydrous methanol is added, and the mixture is left to stand for 12-18 hours. The mixture is then filtered and dried to obtain carboxymethyl-β-cyclodextrin. The modification of vitamin E involves placing vitamin E in a reaction vessel, adding dimethylacetamide and stirring until homogeneous, heating to 40-50℃, then adding carboxymethyl-β-cyclodextrin and a catalyst and stirring for 4-6 hours at a stirring rate of 80-120 r / min. After the reaction is complete, deionized water is added, and the product is washed with a 1-2% acetic acid solution and a saturated NaCl solution. After drying, modified vitamin E is obtained. The microcapsules are prepared by adding modified vitamin E to an ethanol aqueous solution with a volume fraction of 75-90%, stirring at 40-50°C for 10-15 minutes, then adding fatty alcohol polyoxyethylene ether ammonium sulfate and stirring for 20-30 minutes, followed by adding a mixed solution of vitamin B and vitamin C, stirring for 1-2 hours, cooling to room temperature and standing for 12-24 hours, washing and drying to obtain compound vitamin microcapsules.

2. The method for preparing vitamin fiber according to claim 1, characterized in that, The concentration of the chloroacetic acid solution is 7-10%, and the mass ratio of chloroacetic acid to β-cyclodextrin in the chloroacetic acid solution is 1:2-3; The amount of anhydrous methanol added is 3-5 times that of the filtrate.

3. The method for preparing vitamin fiber according to claim 1, characterized in that, The amount of dimethylacetamide added is 3-6 times the volume of vitamin E; The mass ratio of carboxymethyl-β-cyclodextrin to vitamin E is 5-12:1-2; the amount of catalyst added is 3-7% of vitamin E. The catalyst comprises N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine, wherein the molar ratio of N,N-dicyclohexylcarboimide and 4-dimethylaminopyridine is 2-5:

1.

4. The method for preparing vitamin fiber according to claim 1, characterized in that, The mass ratio of the modified vitamin E to the ethanol aqueous solution is 1-5:15-20; the amount of fatty alcohol polyoxyethylene ether ammonium sulfate added is 0.6-1.2% of the modified vitamin E. The mixed solution of vitamin B and vitamin C includes vitamin B, vitamin C and deionized water, wherein the mass ratio of vitamin B, vitamin C and deionized water is 1-2:4-5:20-30; The ratio of the mass of the modified vitamin E to the total mass of vitamins B and C is 3-6:

1.

5. The method for preparing vitamin fiber according to claim 1, characterized in that, The blending process involves adding compound vitamin microcapsules and sodium dodecylbenzenesulfonate to the spinning solution and mixing for 15-20 minutes to obtain a vitamin spinning solution.

6. The method for preparing vitamin fiber according to claim 5, characterized in that, The amount of the compound vitamin microcapsules added is 2-4% of the mass of the spinning solution, and the amount of sodium dodecylbenzenesulfonate added is 0.5-0.8% of the mass of the compound vitamin microcapsules.

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