Preparation method of regenerated cellulose fiber containing linseed oil and collagen

Abstract

The invention discloses a preparation method of regenerated cellulose fibers containing linseed oil and collagen. The preparation method comprises the following steps: S1, preparing a linseed oil microcapsule solution; s2, preparing a collagen solution; s3, blending the linseed oil dissolving solution, the collagen solution and the viscose spinning solution; s4, spinning; s5, solidification and curing; s6, carrying out post-treatment; the olein viscose fiber is obtained. The problems of poor solubility and dispersibility of the linseed oil and the collagen are solved, and the linseed oil and the collagen can be uniformly distributed in a solution, so that the combination effect of the linseed oil and the collagen with the regenerated cellulose fibers is improved; by adopting a microcapsule technology, the linseed oil and the collagen are wrapped, so that the loss of the linseed oil and the collagen can be reduced, and the utilization rate is increased; by compounding the linseed oil and the collagen with the regenerated cellulose fiber, the fiber can be endowed with better free radical scavenging, anti-oxidation and moisturizing properties.

Description

Technical Field

[0001] This invention relates to the field of chemical fiber manufacturing technology, and in particular to a method for preparing regenerated cellulose fibers containing flaxseed oil and collagen. Background Technology

[0002] As people's living standards continue to improve, their demands for the health and functionality of fibers and textiles are increasing. Due to the adjustability of physical properties and the ability to impart functionality during the production process, regenerated cellulose fibers have attracted increasing attention from researchers and have been the subject of extensive study. Therefore, developing various functional regenerated cellulose fibers (viscose fibers), such as thermal insulation regenerated cellulose fibers and protein composite regenerated cellulose fibers, has become a research hotspot in the field of regenerated cellulose fiber modification.

[0003] Flaxseed oil and collagen have excellent nutritional and health benefits. Flaxseed oil is rich in omega-3 fatty acids, which have antioxidant, anti-inflammatory, and lipid-lowering effects. Collagen is a major component of animal connective tissue, possessing excellent biocompatibility, biodegradability, and bioactivity, and is commonly used in beauty and health products. In the field of chemical fiber manufacturing, regenerated cellulose fiber is a commonly used fiber material, mainly prepared by modifying natural cellulose.

[0004] Current technologies only involve combining collagen with regenerated cellulose fibers through chemical or enzymatic cross-linking, but this approach suffers from low cross-linking efficiency, numerous byproducts, and complex operations. There has been no research on combining flaxseed oil with regenerated cellulose. Furthermore, there has been no research on combining flaxseed oil and collagen together with regenerated fibers.

[0005] However, existing technologies for compounding flaxseed oil and collagen with regenerated cellulose fibers present several challenges. First, flaxseed oil and collagen exhibit poor solubility and dispersibility, making them difficult to distribute uniformly in solution, which affects their binding effect with regenerated cellulose fibers. Second, the utilization rate of flaxseed oil and collagen is low in existing technologies, potentially leading to the loss of some active substances. Furthermore, the antioxidant and moisturizing properties of fibers prepared using current technologies need improvement. Therefore, how to efficiently compound flaxseed oil and collagen with regenerated cellulose fibers, thereby enhancing their utilization rate and bioactivity, is a pressing issue that needs to be addressed. Summary of the Invention

[0006] This invention aims to provide a method for preparing regenerated cellulose fibers containing flaxseed oil and collagen, solving the problem of poor solubility and dispersibility of flaxseed oil and collagen, enabling flaxseed oil and collagen to be evenly distributed in the solution, thereby improving their binding effect with regenerated cellulose fibers; by using microencapsulation technology to encapsulate flaxseed oil and collagen, their loss can be reduced and their utilization rate improved; by combining flaxseed oil and collagen with regenerated cellulose fibers, the fibers can be endowed with better free radical scavenging, antioxidant, and moisturizing properties.

[0007] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A method for preparing regenerated cellulose fibers containing flaxseed oil and collagen includes the following steps: S1. Preparation of flaxseed oil microcapsule solution: The aerogel powder was dissolved in ethanol solution to obtain an aerogel solution. Flaxseed oil microcapsules were slowly added to the aerogel solution and stirred evenly to fully disperse them in the aerogel solution. Polyethylene glycol 200 was then added and stirred. After stirring, the solution was filtered to obtain the flaxseed oil solution. S2. Prepare collagen solution: Select collagen powder with a molecular weight of 5000-10000 Daltons, add the collagen powder to sodium hydroxide solution, and then add the auxiliary agent to obtain collagen solution. S3. Blending of flaxseed oil solution, collagen solution, and viscose spinning solution: Mix the flaxseed oil solution from step S1 and the collagen solution from step S2 in a certain proportion, then add a crosslinking agent and stir using a high-speed particle disperser at a speed of 800-4000 rpm for 0.5-1 hour to ensure thorough and uniform mixing, thereby obtaining an oil-protein solution. The crosslinking agent mixture is slowly and quantitatively added to the oil protein solution while continuously stirring to ensure thorough mixing. The oil protein solution and viscose spinning solution are then degassed separately, statically mixed in a certain proportion, and then degassed again to obtain oil protein viscose fiber. S4. Spinning: The two-bath wet spinning method is adopted. The defoamed oil-containing protein viscose liquid is sent into the spinning machine through the glue supply pipeline. The particle impurities are filtered out again through the candle filter and then sent into the spinneret assembly through the curved tube to form numerous viscose fine streams. S5. Coagulation and solidification: The adhesive stream obtained in step S4 is sent into the coagulation bath. After coagulation and solidification in the coagulation bath, it becomes a nascent filament. The nascent filament is sent by the guide disc to bundle and stretch. The decomposition and regeneration process is completed in the solidification bath to form a stable core-sheath structure and obtain fiber bundles. S6. Post-processing: The fiber bundles described in step S5 are cut according to certain specifications, and then subjected to pickling, desulfurization, water washing, pickling, water washing, oiling, dehydration and drying to obtain oil protein viscose fiber.

[0008] Furthermore, in step S1, the aerogel powder is a water-soluble powder with many pores. Dissolving flaxseed oil microcapsules in it will fill the pores with flaxseed oil microcapsules, increasing their contact area with collagen and adhesive liquid. At the same time, it also protects the flaxseed oil microcapsules, reducing the damage of flaxseed oil microcapsules to acids and alkalis during subsequent spinning, delaying the release of microcapsules, and improving the utilization and retention rate of microcapsules.

[0009] In step S1, the mass fraction of the ethanol solution is 2-3%.

[0010] In step S1, the mass fraction of flaxseed oil in the flaxseed oil solution is 15-30%.

[0011] In step S1, the concentration of the aerogel solution is 1-5% by mass.

[0012] In step S1, the mass ratio of polyethylene glycol 200 to flaxseed oil solution is 4-12%.

[0013] In step S1, the particle diameter of the flaxseed oil microcapsules is ≤5µm.

[0014] In step S2, the auxiliary agent is gelatin, and the amount of gelatin used is 0.2-1% of the collagen solution. By adding the auxiliary agent, the utilization rate of collagen in the subsequent spinning process can be improved.

[0015] In step S2, the mass concentration of sodium hydroxide is 2-4%.

[0016] In step S2, the mass ratio of collagen powder in the collagen solution is 15-30%.

[0017] In step S3, the flaxseed oil solution and the collagen solution are mixed at a mass ratio of 1:1-1.5.

[0018] In step S3, the collagen protein mass is 2-30% of the methyl cellulose mass in the viscose spinning solution, and the flaxseed oil mass is 1-15% of the methyl cellulose mass in the viscose spinning solution.

[0019] In step S3, the crosslinking agent is polyethyleneimine, and the mass ratio of the crosslinking agent to the oil protein solution is 3-7%. The crosslinking agent can increase the crosslinking between the mixture and between the mixture and the adhesive, thereby improving the utilization rate of flaxseed oil and collagen.

[0020] In step S5, the coagulation bath consists of 250-360 g / L sodium sulfate, 80-130 g / L sulfuric acid, and 20-40 g / L zinc sulfate.

[0021] The beneficial effects of this invention are: 1. This invention employs a multi-step, multiple-filtration method to obtain a high-content oil-protein solution, improving the solubility and dispersibility of flaxseed oil and collagen, allowing them to be more evenly distributed in the solution. This is beneficial for their binding effect with regenerated cellulose fibers. If flaxseed oil is directly added to the mixture, hydrolysis, oxidation, and esterification reactions will occur in subsequent strong acid and alkali environments, damaging the structural properties of the flaxseed oil. Furthermore, as flaxseed oil is an oil, water-oil separation will occur in subsequent processes, increasing losses. In this invention, the flaxseed oil is encapsulated, increasing its content. This method is simpler and more uniform than directly dispersing flaxseed oil in viscose. Additionally, the microcapsule form makes it easier to mix with collagen than directly mixing flaxseed oil. Flaxseed oil itself is an oil, making direct oil-water mixing difficult and prone to stratification. Water-soluble microcapsules can be directly dissolved and dispersed in water, facilitating easier mixing.

[0022] 2. This invention utilizes microcapsules to prepare the same aqueous phase, rather than a water-oil mixture, reducing stratification and loss. By leveraging the porous properties of aerogels, more of the effective components of flaxseed oil microcapsules are retained, reducing loss during spinning. At the same time, the microcapsules themselves are protected and slowly released, allowing the oil protein to be evenly distributed in the solution and ensuring uniform mixing with the viscose. This will further improve the utilization rate of flaxseed oil and collagen, and reduce the loss of active substances.

[0023] 3. This invention incorporates an aerogel homologous to the encapsulation material of oleoprotein microcapsule powder, which can further ensure the retention of the effective components of oleoprotein, better bind with subsequent adhesive liquid, and improve utilization rate. This will further enhance the bioactivity of flaxseed oil and collagen, and strengthen their health benefits.

[0024] 4. The fiber prepared by this invention has good free radical scavenging, antioxidant, and moisturizing properties, which will improve its effectiveness and meet people's needs for skincare, makeup, and perfume products. The antioxidant principle of flaxseed oil is due to its rich content of unsaturated fatty acids such as linolenic acid and alpha-linolenic acid. Unsaturated fatty acids have multiple double bonds, which are prone to oxidation. Linolenic acid and alpha-linolenic acid in flaxseed oil can react with oxygen in the air to form free radicals. In addition, flaxseed oil also contains abundant vitamin E and polyphenols, among other natural antioxidants. These antioxidants can react with free radicals to neutralize their activity and prevent free radical-induced oxidation reactions. Therefore, the prepared fiber has an antioxidant effect. Collagen contains a large number of hydrophilic groups, which can strongly lock in moisture, keeping the skin hydrated, radiant, and smooth for a long time. Supplementing with collagen can effectively improve skin dryness and dehydration, keeping the skin moisturized. Collagen is rich in hydrophilic natural moisturizing factors, and its unique triple helix structure can powerfully lock in water molecules, absorbing up to 30 times its own weight in water, thus effectively moisturizing the skin and making it radiant and supple.

[0025] 5. The preparation method of the present invention is simple, easy to operate, and conducive to large-scale production, which will reduce production costs and improve economic benefits.

[0026] 6. In this invention, microcapsules are used to reduce flaxseed oil loss and stratification; aerogel is used as a protective layer for the flaxseed oil microcapsules and collagen to reduce loss and improve utilization; the molecular weight of collagen is limited. If the molecular weight is too small, the prepared collagen solution will easily be lost due to the small molecular weight, increasing costs; if the molecular weight is too large, it is impossible to prepare a high concentration of protein solution, and it is also not conducive to subsequent spinning, which is prone to clogging and cannot be formed. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the preparation process of the regenerated cellulose fiber containing flaxseed oil and collagen according to the present invention.

[0028] Figure 2 This is a diagram of the regenerated cellulose fiber containing flaxseed oil and collagen obtained in Example 1 of the present invention. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0030] Example 1 This embodiment provides a method for preparing regenerated cellulose fibers containing flaxseed oil and collagen, including the following steps: S1. Preparation of flaxseed oil microcapsule solution: Aerogel powder was added to a 2% (w / w) ethanol solution to prepare a 2% (w / w) aerogel solution. Flaxseed oil microcapsules with a particle size of ≤5μm were slowly added to the aerogel solution and stirred until fully dispersed. Polyethylene glycol 200 was added, and the mixture was stirred at 3000 rpm for 0.5 hours using a high-speed particle disperser. The mixture was then filtered to obtain a flaxseed oil solution, wherein the content of polyethylene glycol 200 was 6% of the flaxseed oil solution, the mass fraction of flaxseed oil in the flaxseed oil solution was 15%, and the mass ratio of polyethylene glycol 200 to flaxseed oil solution was 8%. 100g of the solution was prepared. S2. Prepare collagen solution: Select collagen powder with a molecular weight of 8000 Daltons, add 30 grams of collagen powder to 70 grams of sodium hydroxide solution with a mass fraction of 3%, and then add 0.6 grams of gelatin to obtain collagen solution. S3. Blend flaxseed oil, collagen solution and viscose spinning solution: Take 50g of flaxseed oil solution and 50g of collagen solution respectively, slowly add 4g of polyethyleneimine, and stir for 0.5 hours at 2000 rpm using a high-speed particle disperser to obtain an oil protein solution containing flaxseed oil and collagen. The obtained oil-protein solution and viscose solution are then degassed separately, statically mixed in a certain proportion, and further degassed to obtain an oil-protein-viscose mixture. The collagen protein mass is 2-30% of the cellulose mass in the viscose spinning solution, and the flaxseed oil mass is 1-15% of the cellulose mass in the viscose spinning solution. The oil-protein solution and viscose spinning solution are statically mixed in a certain proportion, and then further degassed to obtain an oil-protein-viscose spinning solution. S4. Spinning: The two-bath wet spinning method is adopted. The defoamed oil-containing protein viscose liquid is sent into the spinning machine through the glue supply pipeline. The particle impurities are filtered out again through the candle filter and then sent into the spinneret assembly through the curved tube to form numerous viscose fine streams. S5. Coagulation and solidification: The adhesive stream obtained in step S4 is sent to a coagulation bath. After coagulation in a coagulation bath composed of sodium sulfate 260g / L, sulfuric acid 100g / L, zinc sulfate 30g / L, and barium sulfate 15g / L, it becomes a nascent filament. The nascent filament is sent to a bundle stretching device by a guide disc. The decomposition and regeneration process is completed in the solidification bath to form a stable core-sheath structure and obtain a fiber bundle. S6. Post-processing: The fiber bundles described in step S5 are cut according to certain specifications, and then subjected to pickling, desulfurization, water washing, pickling, water washing, oiling, dehydration and drying to obtain oil protein viscose fiber.

[0031] The performance of the oleoprotein viscose fiber obtained in this embodiment was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this embodiment are shown in Table 1. The antibacterial properties of the fibers were tested using the oscillation method according to GB / T 20944.3-2007. The protein content of the fiber was determined by the Kjeldahl method (FZ / T 50018-2013) according to method A. The total fatty acid content in the fiber was determined using liquid chromatography. Table 1. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Example 2. Example 2 This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that: in this embodiment, the amount of gelatin used is 0.2% of the collagen solution, the mass ratio of the crosslinking agent to the oil protein solution is 3%; the mass fraction of flaxseed oil in the flaxseed oil solution is 15%; the concentration of the aerogel solution is 3%; the mass ratio of polyethylene glycol 200 to the flaxseed oil solution is 4%; the mass concentration of sodium hydroxide is 2%; the mass ratio of collagen powder in the collagen solution is 15%; the collagen protein mass is 10% of the cellulose mass, and the flaxseed oil mass is 5% of the cellulose mass, and static mixing is performed. The remaining methods are the same as in Embodiment 1.

[0032] The performance of the oleoprotein viscose fiber obtained in this embodiment was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this embodiment are shown in Table 2. Table 2. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Example 2 Example 3 This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that: in this embodiment, the amount of gelatin used is 1% of the collagen solution, the mass ratio of the crosslinking agent to the oil protein solution is 7%; the mass fraction of flaxseed oil in the flaxseed oil solution is 30%; the concentration of the aerogel solution is 5%; the mass ratio of polyethylene glycol 200 to the flaxseed oil solution is 12%; the mass concentration of sodium hydroxide is 4%; the mass ratio of collagen powder in the collagen solution is 18%; the collagen protein mass is 8% of the cellulose mass, and the flaxseed oil mass is 4% of the cellulose mass, and static mixing is performed. The remaining methods are the same as in Embodiment 1.

[0033] The performance of the oleoprotein viscose fiber obtained in this embodiment was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this embodiment are shown in Table 3. Table 3. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Example 3 Example 4 This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that: in this embodiment, the amount of gelatin used is 0.2% of the collagen solution, the mass ratio of the crosslinking agent to the oil protein solution is 7%; the mass fraction of flaxseed oil in the flaxseed oil solution is 30%; the concentration of the aerogel solution is 1%; the mass ratio of polyethylene glycol 200 to the flaxseed oil solution is 12%; the mass concentration of sodium hydroxide is 4%; the mass ratio of collagen powder in the collagen solution is 30%; static mixing is performed at a ratio of 2-30% of the mass of collagen protein in the viscose spinning solution and 1-15% of the mass of flaxseed oil in the viscose spinning solution, and the remaining methods are the same as in Embodiment 1.

[0034] The performance of the oleoprotein viscose fiber obtained in this embodiment was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this embodiment are shown in Table 4. Table 4. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Example 4. Comparative Example 1 The difference between this comparative example and Example 1 is that no aerogel powder is added in step S1 of this comparative example, while the other steps are the same as in Example 1.

[0035] The performance of the oleoprotein viscose fiber obtained in this comparative example was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this example are shown in Table 5. Table 5. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen (Comparative Example 1) Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, collagen powder with a molecular weight of 4000 Daltons is used in step S2, while the other steps are the same as in Example 1.

[0036] The performance of the oleoprotein viscose fiber obtained in this comparative example was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this example are shown in Table 6. Table 6. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Comparative Example 2 Comparative Example 3 The difference between this comparative example and Example 1 is that gelatin is not added as an additive in step S2 of this comparative example, while the other steps are the same as in Example 1.

[0037] The performance of the oleoprotein viscose fiber obtained in this comparative example was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this example are shown in Table 7. Table 7. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen in Comparative Example 3 Comparative Example 4 The difference between this comparative example and Example 1 is that polyethyleneimine is not added as a crosslinking agent in step S3 of this comparative example, while the other steps are the same as in Example 1.

[0038] The performance of the oleoprotein viscose fiber obtained in this comparative example was tested. The performance test results of the regenerated cellulose fiber containing flaxseed oil and collagen in this example are shown in Table 8. Table 8. Performance test results of regenerated cellulose fibers containing flaxseed oil and collagen (Comparative Example 4) As can be seen from Tables 1-8, compared with Example 1, Comparative Example 1 showed a significant decrease in antibacterial properties, protein content, and total fatty acid content. This indicates that the use of aerogel powder can effectively increase the total protein and fatty acid content in the fiber and improve their utilization rate. This is because the porous network structure of the aerogel itself allows more effective components of flaxseed oil and collagen to enter the network under the same volume. During the subsequent spinning process, it is not easily damaged by strong acid and alkali environments, thus becoming a protective layer for both and improving the utilization rate of raw materials. At the same time, it slows down the release process of flaxseed oil microcapsules. Compared with Example 1, Comparative Example 2 showed a significant decrease in antibacterial properties, protein content, and total fatty acid content. This is because the molecular weight of collagen affects its utilization rate during use. If the molecular weight is too low, too much is lost, resulting in low utilization. If the molecular weight is too high, it is impossible to prepare a collagen solution suitable for spinning.

[0039] Compared with Example 1, Comparative Example 3 showed a significant decrease in antibacterial properties, protein content, and total fatty acid content. This is because gelatin increases the concentration of collagen solution. In acidic or alkaline environments, since both are homologous substances, gelatin can protect collagen to a certain extent and improve the utilization rate of collagen. Compared with Example 1, Comparative Example 4 showed a significant decrease in antibacterial properties, protein content, and total fatty acid content. This is because the cross-linking agent polyethyleneimine can increase the cross-linking between the mixtures and between the mixture and the adhesive, thereby improving the utilization rate of flaxseed oil and collagen.

[0040] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for preparing regenerated cellulose fibers containing flaxseed oil and collagen, characterized in that: Includes the following steps: S1. Preparation of flaxseed oil microcapsule solution: The aerogel powder was dissolved in ethanol solution to obtain an aerogel solution. Flaxseed oil microcapsules were slowly added to the aerogel solution and stirred evenly to fully disperse them in the aerogel solution. Polyethylene glycol 200 was then added and stirred. After stirring, the solution was filtered to obtain the flaxseed oil solution. S2. Prepare collagen solution: Select collagen powder with a molecular weight of 5000-10000 Daltons, add the collagen powder to sodium hydroxide solution, and then add the auxiliary agent to obtain collagen solution. S3. Blending of flaxseed oil solution, collagen solution, and viscose spinning solution: Mix the flaxseed oil solution from step S1 and the collagen solution from step S2 in a certain proportion, then add a crosslinking agent and stir using a high-speed particle disperser at a speed of 800-4000 rpm for 0.5-1 hour to ensure thorough and uniform mixing, thereby obtaining an oil-protein solution. The crosslinking agent mixture is slowly and quantitatively added to the oil protein solution while continuously stirring to ensure thorough mixing. The oil protein solution and viscose spinning solution are then degassed separately, statically mixed in a certain proportion, and then degassed again to obtain oil protein viscose fiber. S4. Spinning: The two-bath wet spinning method is adopted. The defoamed oil-containing protein viscose liquid is sent into the spinning machine through the glue supply pipeline. The particle impurities are filtered out again through the candle filter and then sent into the spinneret assembly through the curved tube to form numerous viscose fine streams. S5. Coagulation and solidification: The adhesive stream obtained in step S4 is sent into the coagulation bath. After coagulation and solidification in the coagulation bath, it becomes a nascent filament. The nascent filament is sent by the guide disc to bundle and stretch. The decomposition and regeneration process is completed in the solidification bath to form a stable core-sheath structure and obtain fiber bundles. S6. Post-processing: The fiber bundles described in step S5 are cut according to certain specifications, and then subjected to pickling, desulfurization, water washing, pickling, water washing, oiling, dehydration and drying to obtain oil protein viscose fiber.

2. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: The aerogel powder has a mass fraction of 1-5%; the ethanol solution has a mass fraction of 2-3%.

3. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S1, the mass fraction of flaxseed oil in the flaxseed oil solution is 15-30%.

4. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S1, the concentration of the aerogel solution is 1-5% by mass, and the particle diameter of the flaxseed oil microcapsules is ≤5 μm.

5. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S1, the mass ratio of polyethylene glycol 200 to flaxseed oil solution is 4-12%.

6. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S2, the auxiliary agent is gelatin, and the amount of gelatin used is 0.2-1% of the collagen solution.

7. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S2, the mass concentration of sodium hydroxide is 2-4%; in step S2, the mass ratio of collagen powder in the collagen solution is 15-30%.

8. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S3, the collagen protein mass is 2-30% of the methyl cellulose mass in the viscose spinning solution, and the flaxseed oil mass is 1-15% of the methyl cellulose mass in the viscose spinning solution.

9. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S3, the crosslinking agent is polyethyleneimine, and the mass ratio of the crosslinking agent to the oil protein solution is 3-7%.

10. The method for preparing regenerated cellulose fibers containing flaxseed oil and collagen according to claim 1, characterized in that: In step S5, the coagulation bath consists of 250-360 g / L sodium sulfate, 80-130 g / L sulfuric acid, and 20-40 g / L zinc sulfate.

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