Preparation method of skin-care and odor-removing regenerated cellulose fiber

Abstract

The invention belongs to the technical field of functional fibers, and particularly relates to a preparation method of skin-care and odor-removing regenerated cellulose fibers. According to the preparation method, a modified functional agent is obtained by generating a polytannic acid thin layer on the surface of a bamboo charcoal adsorbate, so that the dispersity of bamboo charcoal powder particles and the slow release effect on jojoba oil are improved; polytannic acid on the surface of the modifying functional agent and amino in amino modified dimethyl siloxane are subjected to a Michael addition / Schiff base reaction under the weak alkaline condition to form a cross-linked structure, the internal stability of the fiber is improved, meanwhile, the fiber strength and the combination effect of the modifying functional agent and the fiber are improved, and the function durability is higher. The prepared skin-care odor-removing regenerated cellulose fiber has excellent mechanical properties and a good deodorizing effect, the reduction rate of ammonia gas is greater than or equal to 90%, the reduction rate of acetic acid is greater than or equal to 90%, and the reduction rate of isovaleric acid is greater than or equal to 85%.

Description

Technical Field

[0001] The invention belongs to the technical field of functional fibers, and in particular relates to a method for preparing regenerated cellulose fibers for skin care and deodorization. Background Art

[0002] With technological advancements, economic development, and rising living standards, the concept of green, safe, healthy, and comfortable consumption has become increasingly popular. Fiber fabrics infused with natural functional materials like hyaluronic acid, collagen, and essential oils have emerged, and the "skin-nourishing fabric" product line has become a hot seller.

[0003] Jojoba oil, derived from the seeds of the jojoba plant, has excellent permeability and is rich in vitamin D and protein. It is highly moisturizing and hydrating, offering water-oil balancing, anti-inflammatory, antioxidant, and moisturizing properties. Camellia oil, derived from the tender stems, leaves, and mature seeds of the Camellia sinensis plant (Theaceae), is extracted through oil refining techniques. It contains over 85% oleic acid and numerous bioactive substances, including tea polyphenols, vitamin E, vitamin D, and squalene. It can be used in high-quality pharmaceuticals and skin care products. Directly adding essential oils to fibers or finishing textile fabrics presents challenges with loss and durability of efficacy.

[0004] Bamboo charcoal is made from bamboo carbonized at 1000°C. It has a loose, porous structure, fine-grained molecules, a hard texture, and strong adsorption capacity. It can purify the air, eliminate odors, promote blood circulation and metabolism, and relieve fatigue. The production of bamboo charcoal fiber is a mature process, which involves grinding and dispersing bamboo charcoal and adding it to various chemical fibers. Using bamboo charcoal to adsorb essential oils and then adding them to fibers can enhance their sustained release. However, bamboo charcoal tends to agglomerate, clogging spinnerets and affecting the mechanical properties of the fibers. Furthermore, using bamboo charcoal to adsorb essential oils poses the risk of sudden release during subsequent washings, resulting in reduced functionality. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a method for preparing regenerated cellulose fiber for skin care and deodorization, thereby achieving the invention objectives of reducing the loss of essential oils during washing and uniformly dispersing bamboo charcoal in the fiber spinning solution. The method for preparing regenerated cellulose fiber for skin care and deodorization comprises the following steps: S1. Preparation of modified functional emulsion Jojoba oil is added to bamboo charcoal powder and stirred to mix evenly, and then the mixture is put into a grinder for high-speed grinding and dispersion, so that the bamboo charcoal powder fully absorbs the jojoba oil to obtain a bamboo charcoal adsorbent; after grinding and dispersion, the bamboo charcoal adsorbent is added to deionized water and ultrasonically treated for 2 to 5 minutes, the pH of the system is adjusted to 8 to 9 with a sodium hydroxide solution, and then tannic acid is added dropwise, and the reaction is continuously stirred to form a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, i.e., a modified functional agent; a stabilizer is added to the system to obtain a modified functional emulsion with a certain viscosity and system stability.

[0006] Preferably, the weight of bamboo charcoal in the modified functional emulsion accounts for 10 to 20%.

[0007] Preferably, the jojoba oil in the modified functional emulsion is 5-20% of the mass of the bamboo charcoal.

[0008] Preferably, the grinder is a ceramic nano-grinder, the grinding speed is 1000-2000 r / min, and the grinding time is 90-120 min; the particle size of the bamboo charcoal adsorbent after grinding and dispersion is D10 ≥ 0.5 μm and D90 ≤ 2.0 μm, which not only ensures the adsorption rate of bamboo charcoal powder particles on jojoba oil, but also ensures the spinnability of subsequent spinning.

[0009] Preferably, the frequency of the ultrasonic treatment is 40 to 80 kHz.

[0010] Preferably, the mass fraction of the sodium hydroxide solution is 7-10%.

[0011] Preferably, the amount of tannic acid added is 12-16% of the mass of the bamboo charcoal in the modified functional emulsion.

[0012] Preferably, the droplet acceleration rate of the tannic acid is 20-40 ml / min.

[0013] Preferably, the stirring reaction is carried out at a rate of 200 to 300 r / min and for a time of 16 to 20 h.

[0014] Preferably, the stabilizer is one or more of hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and the added amount is 0.5-1% of the mass of the modified functional emulsion.

[0015] The formation of a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent can not only improve the dispersion ability of the bamboo charcoal powder particles and avoid agglomeration, but also improve the sustained-release ability of the bamboo charcoal powder, thereby avoiding the sudden release of jojoba oil during subsequent fiber washing, which would cause a significant decrease in functionality. The addition of a stabilizer can improve the overall stability of the emulsion system and improve its compatibility with the cellulose spinning solution.

[0016] S2. Preparation of blended spinning solution Cotton pulp, wood pulp, bamboo pulp or a mixture thereof is selected as raw material, and cellulose spinning solution is prepared through processes such as impregnation, pressing, crushing, aging, xantholysis, dissolution, filtration and degassing; modified functional emulsion is added to the cellulose spinning solution in proportion before spinning and mixed evenly to prepare a blended spinning solution.

[0017] Preferably, the viscosity of the cellulose spinning solution is 30-50s (falling ball method), the maturity is 10-15mL (10% NH4CL), the methylcellulose content is 8.8-9.2wt%, and the sodium hydroxide content is 4.5-5.2wt%.

[0018] Preferably, the added amount of the modified functional emulsion is such that the bamboo charcoal adsorbent in the modified functional emulsion accounts for 5 to 10 wt % of the methyl cellulose content in the cellulose spinning solution.

[0019] S3, Spinning After the blended spinning solution is ejected from the spinneret, it is formed and drawn in a coagulation bath to obtain a primary fiber tow. The tow is further drawn in a second bath and enters the post-processing process.

[0020] Preferably, in the coagulation bath, sulfuric acid is 60-80 g / L, zinc sulfate is 40-50 g / L, sodium sulfate is 200-230 g / L, the reaction temperature is 35-40° C., and the draft in the coagulation bath is controlled at 10-30%.

[0021] Preferably, the H2SO4 content in the second bath is 15-30 g / L, the bath temperature is controlled at 80-90°C, and the draft in the second bath is controlled at 70-90%.

[0022] S4. Post-processing The fibers after double-bath drawing are acid-washed, desulfurized, washed, oiled, and dried to produce skin-protecting and odor-removing regenerated cellulose fibers.

[0023] Preferably, the desulfurization uses sodium sulfite as a desulfurizing agent with a concentration of 10 to 20 g / L and a temperature of 70 to 80°C.

[0024] Preferably, the oiling is performed by immersing the desulfurized fiber in an oil bath, heating the oil bath to 60-70° C. and maintaining the temperature for 2-3 hours.

[0025] Furthermore, in the oil bath, amino-modified dimethylsiloxane accounts for 2-4% of the mass of the oil bath, and the penetrant fatty alcohol polyoxyethylene ether accounts for 0.1-0.3% of the mass of the oil bath; the pH of the oil bath is 8-8.5.

[0026] Under the action of the penetrant, amino-modified dimethylsiloxane penetrates the fiber and reacts with the evenly distributed modifier within the fiber to form a cross-linked structure. The specific reaction principle is: the polytannic acid on the surface of the modifier and the amino groups in the amino-modified dimethylsiloxane undergo a Michael addition / Schiff base reaction under weakly alkaline conditions, forming a cross-linked structure. This not only improves the bonding between the modifier and the fiber, but also further enhances the fiber strength. The amino-modified dimethylsiloxane not only acts as an oiling agent, but also strengthens the bonding between the modifier and the fiber, achieving two goals at once.

[0027] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are: 1. The skin care and deodorizing regenerated cellulose fiber prepared by the present invention has excellent mechanical properties, wherein the dry breaking strength is 2.72-2.93 cN / dtex and the wet breaking strength is 1.82-1.97 cN / dtex.

[0028] 2. The skin care and odor removal regenerated cellulose fiber prepared by the present invention has a good deodorizing effect, wherein the ammonia reduction rate is ≥90%, the acetic acid reduction rate is ≥90%, and the isovaleric acid reduction rate is ≥85% (according to "GB / T 33610.2-2017 Determination of Deodorizing Performance of Textiles Part 2: Inspection Tube Method").

[0029] 3. The skin-care and odor-removing regenerated cellulose fiber prepared by the present invention has a soft hand feel and good wrinkle resistance. After being made into fabric, the wrinkle recovery angle can reach about 230° (tested in accordance with "GB / T 3819-1997 Determination of Crease Recovery of Textile Fabrics").

[0030] 4. The present invention forms a modified functional agent by forming a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, improving the dispersibility of the bamboo charcoal powder particles and the sustained release of jojoba oil. During the subsequent oiling process, the polytannic acid on the surface of the modified functional agent reacts with the amino groups in the amino-modified dimethylsiloxane under weakly alkaline conditions to form a Michael addition / Schiff base reaction, forming a cross-linked structure. This improves the internal stability of the fiber, while also enhancing fiber strength and the bonding between the modified functional agent and the fiber, resulting in a more durable function. Testing has shown that the loss of jojoba oil active ingredients in the skin-care and odor-removing regenerated cellulose fiber prepared by the present invention after fifty washes was less than 3%. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with preferred embodiments.

[0032] Example 1: Preparation method of skin care and deodorizing regenerated cellulose fiber S1. Preparation of modified functional emulsion Jojoba oil is added to bamboo charcoal powder and stirred to mix evenly, and then the mixture is placed in a grinder for high-speed grinding and dispersion, so that the bamboo charcoal powder fully absorbs the jojoba oil to obtain a bamboo charcoal adsorbent; after grinding and dispersion, the bamboo charcoal adsorbent is added to deionized water and ultrasonically treated for 4 minutes, the pH of the system is adjusted to 8.5 with sodium hydroxide solution, and tannic acid is then added dropwise, and the reaction is continuously stirred to form a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, i.e., a modified functional agent; a stabilizer is added to the system to obtain a modified functional emulsion with a certain viscosity and system stability.

[0033] The weight of bamboo charcoal in the modified functional emulsion accounts for 15%.

[0034] The jojoba oil in the modified functional emulsion is 15% of the mass of the bamboo charcoal.

[0035] The grinder is a ceramic nano-grinder, the grinding speed is 1600 r / min, and the grinding time is 110 min; the particle size of the bamboo charcoal adsorbent after grinding and dispersion is D10=0.5 μm and D90=2.0 μm.

[0036] The frequency of the ultrasonic treatment was 60 kHz.

[0037] The mass fraction of the sodium hydroxide solution is 8%.

[0038] The added amount of the tannic acid is 14% of the mass of the bamboo charcoal in the modified functional emulsion.

[0039] The dropwise addition rate of the tannic acid was 30 ml / min.

[0040] The stirring reaction was carried out at a rate of 250 r / min and for 18 h.

[0041] The stabilizer is hydroxyethyl cellulose (HEC), and the added amount is 0.8% of the mass of the modified functional emulsion.

[0042] S2. Preparation of blended spinning solution Cotton pulp is used as raw material, and cellulose spinning solution is prepared through processes such as impregnation, pressing, crushing, aging, yellowing, dissolving, filtering, and degassing; the modified functional emulsion is added to the cellulose spinning solution in proportion before spinning and mixed evenly to prepare a blended spinning solution.

[0043] The viscosity of the cellulose spinning solution is 40s (falling ball method), the maturity is 13mL (10% NH4CL), the methyl cellulose content is 9wt%, and the sodium hydroxide content is 4.8wt%.

[0044] The added amount of the modified functional emulsion is such that the bamboo charcoal adsorbent in the modified functional emulsion accounts for 8wt% of the methyl cellulose content in the cellulose spinning solution.

[0045] S3, Spinning After the blended spinning solution is ejected from the spinneret, it is formed and drawn in a coagulation bath to obtain a primary fiber tow. The tow is further drawn in a second bath and enters the post-processing process.

[0046] In the coagulation bath, sulfuric acid is 70 g / L, zinc sulfate is 45 g / L, and sodium sulfate is 210 g / L. The reaction temperature is 38° C., and the draft in the coagulation bath is controlled at 20%.

[0047] The H2SO4 content in the second bath is 20 g / L, the bath temperature is controlled at 85°C, and the draft in the second bath is controlled at 80%.

[0048] S4. Post-processing The fibers after double-bath drawing are acid-washed, desulfurized, washed, oiled, and dried to produce skin-protecting and odor-removing regenerated cellulose fibers.

[0049] The desulfurization adopts sodium sulfite as the desulfurization agent with a concentration of 15 g / L and a temperature of 75°C.

[0050] The oiling step is to immerse the desulfurized fiber in an oil bath, heat it to 65° C., and keep it in an oil bath for 2.5 hours.

[0051] In the oil bath, amino-modified dimethylsiloxane accounts for 3% of the mass of the oil bath, and the penetrant fatty alcohol polyoxyethylene ether accounts for 0.2% of the mass of the oil bath; the pH of the oil bath is 8.5.

[0052] Example 2: A method for preparing regenerated cellulose fiber for skin care and deodorization S1. Preparation of modified functional emulsion Jojoba oil is added to bamboo charcoal powder and stirred to mix evenly, and then the mixture is placed in a grinder for high-speed grinding and dispersion, so that the bamboo charcoal powder fully absorbs the jojoba oil to obtain a bamboo charcoal adsorbent; after grinding and dispersion, the bamboo charcoal adsorbent is added to deionized water and ultrasonically treated for 2 minutes, the pH of the system is adjusted to 8 with sodium hydroxide solution, and tannic acid is then added dropwise, and the reaction is continuously stirred to form a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, i.e., a modified functional agent; a stabilizer is added to the system to obtain a modified functional emulsion with a certain viscosity and system stability.

[0053] The weight of the bamboo charcoal in the modified functional emulsion accounts for 10%.

[0054] The jojoba oil in the modified functional emulsion is 10% of the mass of the bamboo charcoal.

[0055] The grinder is a ceramic nano-grinder, the grinding speed is 1000 r / min, and the grinding time is 120 min; the particle size of the bamboo charcoal adsorbent after grinding and dispersion is D10=0.5 μm and D90=2.0 μm.

[0056] The frequency of the ultrasonic treatment was 80 kHz.

[0057] The mass fraction of the sodium hydroxide solution is 7%.

[0058] The added amount of the tannic acid is 12% of the mass of the bamboo charcoal in the modified functional emulsion.

[0059] The tannic acid was added at a rate of 20 ml / min.

[0060] The stirring reaction was carried out at a rate of 200 r / min and for 16 h.

[0061] The stabilizer is hydroxyethyl cellulose (HEC), and the added amount is 0.5% of the mass of the modified functional emulsion.

[0062] S2. Preparation of blended spinning solution Cotton pulp is used as raw material, and cellulose spinning solution is prepared through processes such as impregnation, pressing, crushing, aging, yellowing, dissolving, filtering, and degassing; the modified functional emulsion is added to the cellulose spinning solution in proportion before spinning and mixed evenly to prepare a blended spinning solution.

[0063] The viscosity of the cellulose spinning solution is 30s (falling ball method), the maturity is 10mL (10% NH4CL), the methyl cellulose content is 8.8wt%, and the sodium hydroxide content is 4.5wt%.

[0064] The added amount of the modified functional emulsion is such that the bamboo charcoal adsorbent in the modified functional emulsion accounts for 5wt% of the methyl cellulose content in the cellulose spinning solution.

[0065] S3, Spinning After the blended spinning solution is ejected from the spinneret, it is formed and drawn in a coagulation bath to obtain a primary fiber tow. The tow is further drawn in a second bath and enters the post-processing process.

[0066] In the coagulation bath, sulfuric acid is 60 g / L, zinc sulfate is 40 g / L, and sodium sulfate is 200 g / L. The reaction temperature is 35° C., and the draft in the coagulation bath is controlled at 10%.

[0067] The H2SO4 content in the second bath is 30 g / L, the bath temperature is controlled at 80°C, and the draft in the second bath is controlled at 90%.

[0068] S4. Post-processing The fibers after double-bath drawing are acid-washed, desulfurized, washed, oiled, and dried to produce skin-protecting and odor-removing regenerated cellulose fibers.

[0069] The desulfurization adopts sodium sulfite as the desulfurization agent with a concentration of 10 g / L and a temperature of 70°C.

[0070] The oiling step is to immerse the desulfurized fiber in an oil bath, heat it to 60° C., and keep it warm for 2 hours.

[0071] In the oil bath, amino-modified dimethylsiloxane accounts for 2% of the mass of the oil bath, and the penetrant fatty alcohol polyoxyethylene ether accounts for 0.1% of the mass of the oil bath; the pH of the oil bath is 8.

[0072] Example 3: Preparation method of skin care and deodorizing regenerated cellulose fiber S1. Preparation of modified functional emulsion Jojoba oil is added to bamboo charcoal powder and stirred to mix evenly, and then the mixture is placed in a grinder for high-speed grinding and dispersion, so that the bamboo charcoal powder fully absorbs the jojoba oil to obtain a bamboo charcoal adsorbent; after grinding and dispersion, the bamboo charcoal adsorbent is added to deionized water and ultrasonically treated for 5 minutes, the pH of the system is adjusted to 9 with sodium hydroxide solution, and tannic acid is then added dropwise, and the reaction is continuously stirred to form a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, i.e., a modified functional agent; a stabilizer is added to the system to obtain a modified functional emulsion with a certain viscosity and system stability.

[0073] The weight of bamboo charcoal in the modified functional emulsion accounts for 20%.

[0074] The jojoba oil in the modified functional emulsion is 20% of the mass of the bamboo charcoal.

[0075] The grinder is a ceramic nano-grinder, the grinding speed is 2000 r / min, and the grinding time is 90 min; the particle size of the bamboo charcoal adsorbent after grinding and dispersion is D10=0.5 μm and D90=2.0 μm.

[0076] The frequency of the ultrasonic treatment was 40 kHz.

[0077] The mass fraction of the sodium hydroxide solution is 10%.

[0078] The added amount of the tannic acid is 16% of the mass of the bamboo charcoal in the modified functional emulsion.

[0079] The tannic acid was added at a rate of 40 ml / min.

[0080] The stirring reaction was carried out at a rate of 300 r / min and for 20 h.

[0081] The stabilizer is hydroxyethyl cellulose (HEC), and the added amount is 1% of the mass of the modified functional emulsion.

[0082] S2. Preparation of blended spinning solution Cotton pulp is used as raw material, and cellulose spinning solution is prepared through processes such as impregnation, pressing, crushing, aging, yellowing, dissolving, filtering, and degassing; the modified functional emulsion is added to the cellulose spinning solution in proportion before spinning and mixed evenly to prepare a blended spinning solution.

[0083] The viscosity of the cellulose spinning solution is 50s (falling ball method), the maturity is 15mL (10% NH4CL), the methyl cellulose content is 9.2wt%, and the sodium hydroxide content is 5.2wt%.

[0084] The added amount of the modified functional emulsion is such that the bamboo charcoal adsorbent in the modified functional emulsion accounts for 10 wt % of the methyl cellulose content in the cellulose spinning solution.

[0085] S3, Spinning After the blended spinning solution is ejected from the spinneret, it is formed and drawn in a coagulation bath to obtain a primary fiber tow. The tow is further drawn in a second bath and enters the post-processing process.

[0086] In the coagulation bath, sulfuric acid is 80 g / L, zinc sulfate is 50 g / L, and sodium sulfate is 230 g / L. The reaction temperature is 40° C., and the draft in the coagulation bath is controlled at 30%.

[0087] The H2SO4 content in the second bath is 30 g / L, the bath temperature is controlled at 90°C, and the draft in the second bath is controlled at 70%.

[0088] S4. Post-processing The fibers after double-bath drawing are acid-washed, desulfurized, washed, oiled, and dried to produce skin-protecting and odor-removing regenerated cellulose fibers.

[0089] The desulfurization adopts sodium sulfite as the desulfurization agent with a concentration of 20 g / L and a temperature of 80°C.

[0090] The oiling step is to immerse the desulfurized fiber in an oil bath, heat it to 70° C., and keep it warm for 3 hours.

[0091] In the oil bath, amino-modified dimethylsiloxane accounts for 4% of the mass of the oil bath, and the penetrant fatty alcohol polyoxyethylene ether accounts for 0.3% of the mass of the oil bath; the pH of the oil bath is 8.

[0092] Comparative Example 1: Representative Example 1 was selected, and tannic acid was removed from step S1. The rest was consistent with Example 1, as Comparative Example 1.

[0093] Comparative Example 2: Representative Example 1 was selected, and dimethyl silicone oil without amino group was used in step S2. The rest was consistent with Example 1, as Comparative Example 2.

[0094] The fibers prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests, as shown in Table 1.

[0095] Table 1 As can be seen from Table 1, the fibers prepared using Examples 1-3 have excellent mechanical properties, good functional durability, and good anti-wrinkle performance. At the same time, the skin care and odor removal regenerated cellulose fibers prepared using Examples 1-3 have good deodorizing effects, wherein the ammonia reduction rate is ≥90%, the acetic acid reduction rate is ≥90%, and the isovaleric acid reduction rate is ≥85%.

[0096] In Comparative Example 1, the tannic acid in S1 was removed, and the properties of the obtained fiber were greatly reduced. This is because the bamboo charcoal adsorbent is easy to agglomerate, resulting in an unstable internal structure of the fiber and a decrease in strength. In addition, the jojoba oil in the bamboo charcoal adsorbent is easily released during washing, resulting in a rapid decrease in functionality.

[0097] Comparative Example 2 uses dimethyl silicone oil that does not contain amino groups, which cannot cross-link with the polytannic acid on the surface of the modified functional agent. During water washing, the modified functional agent will fall off due to the force it is subjected to, so various performances also show a downward trend. Moreover, since dimethyl silicone oil does not react, the amount added in Comparative Example 2 is slightly higher, resulting in a slippery fiber surface.

[0098] Unless otherwise specified, the ratios and percentages described in the present invention are all by mass; all raw materials are commercially available.

[0099] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing regenerated cellulose fiber for skin care and deodorization, characterized in that: The preparation method comprises the preparation of modified functional emulsion, preparation of blended spinning solution, spinning molding and post-processing.

2. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 1, characterized in that: The modified functional emulsion is prepared by adding jojoba oil to bamboo charcoal powder and stirring to mix evenly, then putting the mixture into a grinder for high-speed grinding and dispersion, so that the bamboo charcoal powder fully absorbs the jojoba oil to obtain a bamboo charcoal adsorbent; After grinding and dispersion, the bamboo charcoal adsorbent is added to deionized water and ultrasonically treated for 2 to 5 minutes. The pH of the system is adjusted to 8 to 9 with sodium hydroxide solution, and tannic acid is added dropwise. The reaction is continuously stirred to form a thin layer of polytannic acid on the surface of the bamboo charcoal adsorbent, which is a modified functional agent. A stabilizer is added to the system to obtain a modified functional emulsion with a certain viscosity and system stability.

3. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 2, characterized in that: The weight of bamboo charcoal in the modified functional emulsion accounts for 10 to 20%; The jojoba oil in the modified functional emulsion is 5-20% of the mass of the bamboo charcoal.

4. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 2, characterized in that: The grinder is a ceramic nano grinder with a grinding speed of 1000-2000 r / min and a grinding time of 90-120 min. The particle size of the bamboo charcoal adsorbent after grinding and dispersion is D10≥0.5 μm and D90≤2.0 μm.

5. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 2, characterized in that: The amount of tannic acid added is 12-16% of the mass of the bamboo charcoal in the modified functional emulsion; The tannic acid addition rate is 20-40 ml / min; The stirring reaction is carried out at a rate of 200 to 300 r / min and for a time of 16 to 20 hours; The stabilizer is one or more of hydroxyethyl cellulose and carboxymethyl cellulose, and the added amount is 0.5-1% of the mass of the modified functional emulsion.

6. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 1, characterized in that: The blended spinning solution is prepared by selecting cotton pulp, wood pulp, bamboo pulp or a mixture thereof as raw materials, and preparing a cellulose spinning solution through the processes of impregnation, pressing, crushing, aging, yellowing, dissolving, filtering, and degassing; and adding the modified functional emulsion to the cellulose spinning solution in proportion before spinning and mixing them uniformly to prepare the blended spinning solution. The added amount of the modified functional emulsion is such that the bamboo charcoal adsorbent in the modified functional emulsion accounts for 5 to 10 wt % of the methyl cellulose content in the cellulose spinning solution.

7. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 1, characterized in that: The spinning process is as follows: after the blended spinning solution is ejected from the spinneret, it is formed and drawn in a coagulation bath to obtain a primary fiber bundle, and the bundle is further drawn in a second bath and enters a post-processing process.

8. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 7, characterized in that: In the coagulation bath, sulfuric acid is 60-80 g / L, zinc sulfate is 40-50 g / L, sodium sulfate is 200-230 g / L, the reaction temperature is 35-40°C, and the draft in the coagulation bath is controlled at 10-30%; The H2SO4 content in the second bath is 15-30 g / L, the bath temperature is controlled at 80-90°C, and the draft in the second bath is controlled at 70-90%.

9. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 1, characterized in that: The post-treatment is that the fibers after the two-bath drafting are acid-washed, desulfurized, washed, oiled, and dried to obtain skin-protecting and odor-removing regenerated cellulose fibers; The desulfurization adopts sodium sulfite as a desulfurizing agent with a concentration of 10-20 g / L and a temperature of 70-80°C.

10. The method for preparing a skin-care and odor-removing regenerated cellulose fiber according to claim 9, characterized in that: The oiling step is to immerse the desulfurized fiber in an oil bath, heat it to 60-70°C and keep it in the oil bath for 2-3 hours; In the oil bath, amino-modified dimethylsiloxane accounts for 2-4% of the mass of the oil bath, and the penetrant fatty alcohol polyoxyethylene ether accounts for 0.1-0.3% of the mass of the oil bath; the pH value of the oil bath is 8-8.5.

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