Preparation process of a facial mask cloth based on mangosteen peel extract

Abstract

The application belongs to the technical field of invention and cosmetic base cloth, and discloses a mask cloth preparation process based on mangosteen peel extract, which comprises the following steps: s1, embedding treatment is performed on mangosteen peel extract powder and beta-cyclodextrin at a mass ratio of 0.2-0.35 to obtain active microcapsules; s2, the active microcapsules are blended with viscose spinning stock solution and hydroxyethyl cellulose, and then wet spinning is performed to obtain mangosteen peel composite fibers, wherein the mass ratio of the active microcapsules to the viscose spinning stock solution is 0.05-0.15, and the mass ratio of the hydroxyethyl cellulose to the viscose spinning stock solution is 0.01-0.03; s3, according to the following mass parts of raw materials: 25-30 parts of mangosteen peel composite fibers, 35-45 parts of viscose fibers, 15-20 parts of bamboo pulp fibers and 5-10 parts of auxiliary fibers, the above raw materials are mixed and carded into a composite fiber web, the composite fiber web is hydroentangled and reinforced, and then hot pressing is performed to form a mask cloth base cloth. The application has the beneficial effects of low cost and improvement of natural antibacterial and antioxidant effects of the mask cloth.

Description

Technical Field

[0001] This invention relates to the field of cosmetic base fabric technology, and in particular to a process for preparing a facial mask fabric based on mangosteen peel extract. Background Technology

[0002] As the carrier of the essence, the performance of the mask base directly affects the consumer's user experience and skincare effects. Most existing mask sheets are made of ordinary viscose fiber, cotton fiber, or synthetic fibers (such as polyester), which have the following shortcomings: ordinary fibers only serve a physical load-bearing function and do not possess skincare functions such as antioxidation and antibacterial properties, requiring the addition of large amounts of preservatives and antioxidants to the essence; some mask sheets add chemical antibacterial agents such as silver ions and quaternary ammonium salts to achieve antibacterial effects, which may cause skin irritation; synthetic fibers are non-biodegradable, causing white pollution after disposal. Some functional mask sheets incorporate functional fibers, such as polysaccharide fibers and seaweed fibers, to enhance antibacterial and moisturizing properties; these functional fibers are expensive. Summary of the Invention

[0003] In order to solve at least some of the problems of existing mask base fabrics, this invention provides a mask fabric preparation process based on mangosteen peel extract. This process can effectively process inexpensive mangosteen peel, protect the active ingredients of mangosteen peel after processing, enhance the natural antibacterial and antioxidant functions of the mask base fabric, reduce the use of antibacterial agents, and improve environmental friendliness while reducing the cost of the mask fabric.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A process for preparing a facial mask sheet based on mangosteen peel extract includes the following steps: s1. Encapsulate mangosteen peel extract powder with β-cyclodextrin at a mass ratio of 0.2-0.35 to obtain active microcapsules; s2. Blend the active microcapsules with viscose spinning solution and hydroxyethyl cellulose, and wet spin to obtain mangosteen peel composite fiber, wherein the mass ratio of active microcapsules to viscose spinning solution is 0.05-0.15, and the mass ratio of hydroxyethyl cellulose to viscose spinning solution is 0.01-0.03; s3. Mix the following raw materials in parts by mass: 25-30 parts mangosteen peel composite fiber, 35-45 parts viscose fiber, 15-20 parts bamboo pulp fiber, and 5-10 parts auxiliary fiber, and comb them into a composite fiber web. After hydroentangling and reinforcing the composite fiber web, hot press it to form a mask fabric base.

[0005] By adopting the above technical solution: mangosteen peel is an agricultural waste, and its raw material cost is 10%-20% of that of functional fibers (such as polysaccharide fibers and seaweed fibers), and the price fluctuation is small. Even after processing, the cost of mangosteen peel composite fiber is only 50% of that of functional fibers. Processing mangosteen peel into mangosteen peel extract, and then making mangosteen peel composite fiber for use in mask cloth, is a way to turn waste into treasure and is low in cost. The xanthones, tannins and other components in mangosteen peel extract endow the mask cloth with natural antibacterial (antibacterial rate against Staphylococcus aureus ≥90%), antioxidant (DPPH scavenging rate ≥80%) and pore-tightening effects, which elevate the mask base cloth to a functional mask cloth. Without the need for other chemical additives, the mask cloth is endowed with antioxidant, antibacterial, oil-controlling and slow-release functions. However, when processing mangosteen peel using traditional functional fiber processing techniques, the active ingredients such as xanthones and tannins in the mangosteen peel are easily lost or deactivated. In step s1, mangosteen peel extract powder and β-cyclodextrin are first encapsulated to obtain active microcapsules. The hydrophobic effect of the β-cyclodextrin cavity is used to protect xanthones, thereby improving heat resistance. In step s2, the retention rate of xanthones is significantly improved during the spinning process. Hydroxyethyl cellulose is added to the viscose spinning solution. During the wet spinning process, hydroxyethyl cellulose forms a semi-interpenetrating network with viscose fibers (formed by spinning the viscose spinning solution), thereby improving the breaking strength of the mangosteen peel composite fiber and preventing breakage during subsequent hydroentangling, which would affect the strength of the mask base fabric. In step s3, bamboo pulp fiber can enhance breathability and also has natural antibacterial properties and improves wet strength. Viscose fiber is soft. The high softness and excellent liquid absorption of the mask fabric result in superior comfort and the ability to retain more essence. After hydroentangling, it undergoes thermoforming, which rearranges the fiber molecular chains, eliminates internal stress, and reduces the wet dimensional change rate of the final mask base fabric. The resulting mask possesses natural antibacterial, antioxidant, and pore-tightening properties. No antibacterial or antioxidant agents are needed in the mask fabric. Compared to existing functional mask fabrics (such as those containing polysaccharide fibers or seaweed fibers), the overall cost is reduced by 30%. The active microcapsules have a slow-release property, allowing the active substances in the mangosteen peel extract within the microcapsules to be slowly released into the skin during use, facilitating long-term absorption. This also reduces the degradation of easily oxidized components in the essence, such as vitamin C and vitamin E, extending the oxidation time of the essence and thus prolonging the mask's effective skincare duration.

[0006] As a preferred method, the preparation method of mangosteen peel extract powder in step s1 is as follows: s1-1, take fresh mangosteen peel, wash it with water and drain it, then dry the drained mangosteen peel at 50-60℃ until the peel moisture content is 3%-8%; s1-2, pulverize the dried mangosteen peel and pass it through a 60-mesh sieve to obtain coarse mangosteen peel powder; s1-3, mix the coarse mangosteen peel powder with a 50-60% ethanol solution at a volume ratio of 0.1-0.2, stir it under ultrasonic conditions for 30-60 minutes, and filter it to obtain mangosteen peel filtrate; s1-4, concentrate and dry the mangosteen peel filtrate to obtain mangosteen peel extract powder. During the processing of mangosteen peel, the drying temperature was controlled at 50-60℃ to protect the active ingredients in the peel. Under ultrasonic conditions, the cavitation effect was used to assist in breaking the cell walls of the mangosteen peel plant cells. Extraction was performed using 50-60% ethanol, and the principle of like dissolves like was used to improve the efficiency of extracting xanthones.

[0007] Preferably, in steps s1-4, the mangosteen peel filtrate is concentrated under reduced pressure to 0.15-0.25% of its original volume under vacuum conditions of 0.08-0.095 MPa and 50-60℃ to obtain a concentrated mangosteen peel solution; activated carbon is added to the concentrated mangosteen peel solution, with the amount of activated carbon being 2-5% of the mass of the concentrated mangosteen peel solution, and the solution is stirred and decolorized at 40-50℃ for 20-40 minutes, followed by filtration to remove the activated carbon, resulting in a decolorized mangosteen peel solution; the decolorized mangosteen peel solution is then spray-dried with an inlet air temperature of 150-170℃, an outlet air temperature of 75-85℃, and a feed flow rate of 10-20 mL / min to obtain a mangosteen peel extract powder with a total xanthonone content ≥10%, a water content ≤5%, and a yield ≥8%. Concentration under negative pressure and 50-60℃ conditions makes ethanol recovery easier, and the recovered ethanol can be recycled, reducing costs. Activated carbon decolorization is used to remove anthocyanins, flavonoid pigments, and some odor substances from the mangosteen peel concentrate. The color of the mangosteen peel concentrate is purplish-brown, while the color of the decolorized mangosteen peel decolorized solution is yellow, reducing color difference issues in subsequent mask sheets. Spray drying is used to obtain a powder with good flowability and easy dispersion, with a very short drying time (second-level drying), resulting in minimal loss of active ingredients in the mangosteen peel extract.

[0008] Preferably, in step s1, the encapsulation process is as follows: Mangosteen peel extract powder and β-cyclodextrin are mixed with water and ground. The amount of water is 10%-20% of the mass of the mangosteen peel extract powder. The mixture is ground until a homogeneous paste is formed. The paste is then spread thinly and placed in a vacuum drying oven at 40-50℃ for 6-10 hours to obtain a dried block with a moisture content ≤5%. The dried block is then pulverized and passed through a 100-mesh sieve to obtain active microcapsules. The drying temperature of 40-50℃ protects the active substances of the mangosteen peel extract from being destroyed. Simultaneously, since β-cyclodextrin is white and mangosteen peel extract is yellow, the encapsulated active microcapsules are light yellow, which better facilitates subsequent color control of the mask fabric and reduces color difference in the mask fabric.

[0009] Preferably, in step s2, the coagulation bath temperature of the wet spinning process is 25-30℃, the coagulation bath is a sulfuric acid / sodium sulfate system, the stretching ratio after spinning is 2.0-3.0 times, and the fineness of the resulting mangosteen peel composite fiber is 1.2-1.8 dtex, with a length of 38-51 mm. Conventional viscose fiber wet spinning temperatures are typically 45-60℃; higher temperatures are beneficial for accelerating the coagulation rate and increasing production capacity. This application uses a wet spinning temperature of 25-30℃, which better protects the active substances in the microcapsules from damage.

[0010] Preferably, in step s3, after the composite fibers are carded into a web, the areal density is controlled at 35-50 g / m². 2 The hydroentangling reinforcement employs a step-by-step pressure increase method, gradually raising the hydroentangling pressure from 30 bar to 120 bar. Existing hydroentangling processes typically maintain high pressure (100-120 bar), which easily leads to the loss of active substances in mangosteen peel extract and fiber breakage. In this application, the hydroentangling pressure gradually increases, allowing the composite fiber web to be moistened, air expelled, and initially shaped in the low-pressure zone; in the medium-pressure zone, the fibers undergo three-dimensional entanglement to form a preliminary fiber winding structure; in the high-pressure zone, the hydroentangling energy is strongest and the pressure is highest, causing plastic deformation and tight entanglement of the fibers. This gradient pressure reduces fiber breakage and the loss of active substances in mangosteen peel extract.

[0011] Preferably, in step s3, the hot pressing temperature is 130-150℃ and the linear pressure is 0.3-0.6MPa.

[0012] Preferably, in step s2, 0.5-1.5% of a cationic modifier, specifically 3-chloro-2-hydroxypropyltrimethylammonium chloride, is added during blending. When acting as a cationic modifier, 3-chloro-2-hydroxypropyltrimethylammonium chloride can better generate electrostatic attraction with negatively charged xanthones and polyphenols to form more stable ionic bonds, thereby reducing the loss of active substances. Simultaneously, 3-chloro-2-hydroxypropyltrimethylammonium chloride also acts as a dispersant, better dispersing the active microcapsules uniformly, resulting in a more stable and uniform spinning process.

[0013] Preferably, after the spunlace reinforcement in step s3 and before the hot pressing treatment, the spunlace nonwoven fabric is immersed in a finishing solution, subjected to two dips and two nips, with a nip-out rate of 70-85%. The finishing solution contains 0.1-0.5 wt% mangosteen peel extract, 0.5-1.5 wt% glycerol, and 0.05-0.3 wt% ε-polylysine. The mangosteen peel extract in the finishing solution replenishes the loss of active substances during the spunlace process, and the trace amount of glycerol increases the moisture absorption of the mask fabric and makes it smoother. ε-polylysine is a natural and safe antibacterial polypeptide with a strong inhibitory effect on molds and yeasts. This complements the antibacterial spectrum of the mangosteen peel fiber, achieving comprehensive antibacterial action against bacteria and fungi.

[0014] Preferably, the auxiliary fiber is cotton pulp fiber, and the viscose fiber is mixed with 5-15% by weight of irregularly shaped cross-section viscose fiber, which has a Y-shaped or cross-shaped cross-section. The cotton pulp fiber is naturally crimped and has a smooth surface, which can reduce the rigidity index of the spunlace nonwoven fabric, making the mask fabric feel closer to pure cotton and reducing the roughness caused by mangosteen peel composite fiber; the irregularly shaped cross-section viscose fiber can conduct water in the groove direction when absorbing liquid, thereby inhibiting radial expansion and effectively reducing the swelling rate of the mask fabric after absorbing liquid; the irregularly shaped cross-section viscose fiber can also increase the entanglement rate between fibers, improving the overall anti-delamination performance of the mask fabric. Detailed Implementation

[0015] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this invention clearer, several exemplary embodiments will be described in further detail below. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0016] The raw materials used in the following examples are sourced as follows: mangosteen peel, fresh mangosteen from Hainan, peels collected; viscose spinning solution: Sateri Group, cellulose content 8%; β-cyclodextrin, hydroxyethyl cellulose, cationic modifier (3-chloro-2-hydroxypropyltrimethylammonium chloride): industrial grade; bamboo pulp fiber: 1.5 dtex × 38 mm, Sichuan Tianzhu; auxiliary fiber, cotton pulp fiber (1.6 dtex × 40 mm, Xinjiang cotton); irregular cross-section viscose fiber: Y-type, cross-type, fineness 1.5 dtex × 38 mm, customized; ε-polylysine: Zhejiang Yinxiang Biotechnology.

[0017] Example 1: A process for preparing a facial mask fabric based on mangosteen peel extract, comprising the following steps: s1, mangosteen peel extract powder and β-cyclodextrin are mixed at a mass ratio of 0.2, water is added and then ground, the amount of water being 10% of the mass of the mangosteen peel extract powder, and ground into a homogeneous paste, the paste is spread thinly and placed in a vacuum drying oven, and dried at 40°C for 10 hours to obtain a dried block with a moisture content ≤5%, the dried block is pulverized and passed through a 100-mesh sieve to obtain active microcapsules; s2. Active microcapsules were blended with viscose spinning solution and hydroxyethyl cellulose, and then wet-spun to obtain mangosteen peel composite fiber. The mass ratio of active microcapsules to viscose spinning solution was 0.05, and the mass ratio of hydroxyethyl cellulose to viscose spinning solution was 0.01. The coagulation bath temperature for wet spinning was 25℃, and the coagulation bath was a sulfuric acid / sodium sulfate system with a sulfuric acid concentration of 50 g / L and a sodium sulfate concentration of 200 g / L. The stretch ratio after spinning was 2.0-3.0 times. The fineness of the obtained mangosteen peel composite fiber was 1.2-1.8 dtex, and the length was 38-51 mm. s3. Using the following proportions of raw materials by weight: 25 parts mangosteen peel composite fiber, 35 parts viscose fiber, 15 parts bamboo pulp fiber, and 5 parts auxiliary fiber (cotton pulp fiber), mix the above raw materials and card them into a composite fiber web; after carding, the areal density of the composite fiber web should be controlled at 35 g / m². 2 After the composite fiber web is reinforced by hydroentangling, it is hot-pressed to form the base fabric of the mask cloth. The hot-pressing temperature is 130℃ and the linear pressure is 0.3Mpa.

[0018] Example 2: A process for preparing a facial mask fabric based on mangosteen peel extract, comprising the following steps: s1, mixing mangosteen peel extract powder and β-cyclodextrin at a mass ratio of 0.35, adding water and grinding, the amount of water being 20% ​​of the mass of the mangosteen peel extract powder, grinding to a homogeneous paste, spreading the paste thinly and placing it in a vacuum drying oven, drying at 50°C for 6 hours to obtain a dried block with a moisture content ≤5%, pulverizing the dried block and passing it through a 100-mesh sieve to obtain active microcapsules; s2. Active microcapsules were blended with viscose spinning solution and hydroxyethyl cellulose, and then wet-spun to obtain mangosteen peel composite fibers. The mass ratio of active microcapsules to viscose spinning solution was 0.15, and the mass ratio of hydroxyethyl cellulose to viscose spinning solution was 0.03. The coagulation bath temperature for wet spinning was 30℃, and the coagulation bath was a sulfuric acid / sodium sulfate system with a sulfuric acid concentration of 70 g / L and a sodium sulfate concentration of 250 g / L. The stretch ratio after spinning was 2.0-3.0 times. The fineness of the obtained mangosteen peel composite fibers was 1.2-1.8 dtex, and the length was 38-51 mm. s3. Using the following raw materials in parts by weight: 30 parts mangosteen peel composite fiber, 45 parts viscose fiber, 20 parts bamboo pulp fiber, and 10 parts auxiliary fiber (cotton pulp fiber), mix the above raw materials and card them into a composite fiber web; after carding, the areal density of the composite fiber web should be controlled at 50 g / m². 2 After the composite fiber web is reinforced by hydroentangling, it is hot-pressed to form the base fabric of the mask cloth. The hot-pressing temperature is 150℃ and the linear pressure is 0.6Mpa.

[0019] Example 3: A process for preparing a facial mask fabric based on mangosteen peel extract, comprising the following steps: s1, mixing mangosteen peel extract powder and β-cyclodextrin at a mass ratio of 0.25, adding water and grinding, the amount of water being 15% of the mass of the mangosteen peel extract powder, grinding to a homogeneous paste, spreading the paste thinly and placing it in a vacuum drying oven, drying at 45°C for 8 hours to obtain a dried block with a moisture content ≤5%, pulverizing the dried block and passing it through a 100-mesh sieve to obtain active microcapsules; s2. Active microcapsules were blended with viscose spinning solution and hydroxyethyl cellulose, and then wet-spun to obtain mangosteen peel composite fibers. The mass ratio of active microcapsules to viscose spinning solution was 0.1, and the mass ratio of hydroxyethyl cellulose to viscose spinning solution was 0.02. The coagulation bath temperature for wet spinning was 28℃, and the coagulation bath was a sulfuric acid / sodium sulfate system with a sulfuric acid concentration of 60 g / L and a sodium sulfate concentration of 225 g / L. The stretch ratio after spinning was 2.0-3.0 times. The fineness of the obtained mangosteen peel composite fibers was 1.2-1.8 dtex, and the length was 38-51 mm. s3. Using the following raw materials in parts by weight: 28 parts mangosteen peel composite fiber, 40 parts viscose fiber, 18 parts bamboo pulp fiber, and 8 parts auxiliary fiber (cotton pulp fiber), mix the above raw materials and card them into a composite fiber web; after carding, the areal density of the composite fiber web should be controlled at 42 g / m². 2 After the composite fiber web is reinforced by hydroentangling, it is hot-pressed to form the mask fabric base. The hot-pressing temperature is 140℃ and the linear pressure is 0.5Mpa.

[0020] Example 4: During the blending process in step s2, a cationic modifier, comprising 0.5-1.5% of the mass of the spinning solution, is added. The cationic modifier is 3-chloro-2-hydroxypropyltrimethylammonium chloride. The remaining steps are the same as in Example 3.

[0021] Example 5: In step s3, the viscose fiber contains 5-15% by mass of irregularly shaped cross-section viscose fiber, the cross-section of which is Y-shaped or cross-shaped. The remaining steps are the same as in Example 3.

[0022] Example 6: In step s3, the hydroentangling reinforcement adopts a step-by-step pressure increase method, with the hydroentangling pressure gradually increasing from 30 bar to 120 bar. The remaining steps are the same as in Example 3.

[0023] Example 7: After the spunlace reinforcement in step s3 and before the hot pressing treatment, the spunlace nonwoven fabric is immersed in a finishing solution, subjected to two dips and two nips, with a pick-up rate of 70-85%. The finishing solution contains 0.1-0.5 wt% mangosteen peel extract, 0.5-1.5 wt% glycerol, and 0.05-0.3 wt% ε-polylysine. The remaining steps are the same as in Example 3.

[0024] In Examples 1-7 above, the preparation method of mangosteen peel extract powder is as follows: s1-1, take fresh mangosteen peel, wash with water and drain, and dry the drained mangosteen peel at 50-60℃ until the peel moisture content is 3%-8%; s1-2, pulverize the dried mangosteen peel and pass it through a 60-mesh sieve to obtain coarse mangosteen peel powder; s1-3, mix the coarse mangosteen peel powder with a 50-60% ethanol solution at a volume ratio of 0.1-0.2, stir under ultrasonic conditions for 30-60 minutes, and filter to obtain mangosteen peel filtrate; s1-4, heat the mangosteen peel filtrate under a vacuum of 0.08-0. Under reduced pressure and at a temperature of 50-60℃, the mangosteen peel concentrate was concentrated to 0.15-0.25% of its original volume to obtain a concentrated mangosteen peel solution. Activated carbon was added to the concentrated mangosteen peel solution at a concentration of 2-5% of the mass of the concentrated mangosteen peel solution. The solution was stirred and decolorized at 40-50℃ for 20-40 minutes, and then filtered to remove the activated carbon, resulting in a decolorized mangosteen peel solution. The decolorized mangosteen peel solution was then spray-dried at an inlet air temperature of 150-170℃, an outlet air temperature of 75-85℃, and a feed flow rate of 10-20 mL / min to obtain a mangosteen peel extract powder with a total xanthonone content ≥10%, a water content ≤5%, and a yield ≥8%.

[0025] The mask base fabrics prepared through the above seven embodiments are functional mask base fabrics. The functional additives in these base fabrics are obtained from mangosteen peels, which are agricultural waste and have the advantage of low cost, effectively reducing the material cost of the functional mask base fabric. The xanthones and tannins in the mangosteen peel extract endow the mask fabric with natural antibacterial, antioxidant, and pore-tightening effects, providing antioxidant, antibacterial, oil-controlling, and slow-release functions without the need for other chemical additives. Although mangosteen peel fibers have many positive effects in mask fabrics, there is no precedent for the industrial-scale application of mangosteen peels in mask fabrics. This is because directly using mangosteen peels in mask fabrics presents several technical obstacles, mainly as follows: the active ingredients in mangosteen peels are easily degraded in the high-temperature acid bath during spinning; the mechanical strength of the fibers decreases after blending; natural pigments cause color differences in the fabric surface; and the high wet expansion rate leads to easy deformation.

[0026] To address the aforementioned technical obstacles, this embodiment employs a specific technical approach: Regarding the degradation or loss of active ingredients in mangosteen peel, in this embodiment, mangosteen peel extract powder is first prepared using a specific process. The preparation process utilizes low-temperature technology (the core processing temperature does not exceed 60°C). β-cyclodextrin contains hydrophobic cavities with an inner diameter of 0.6-0.7 nm, while the molecular size of active substances such as xanthones and tannins is approximately 0.5 nm. The mangosteen peel extract powder is then encapsulated with β-cyclodextrin, allowing the active substance molecules to enter the hydrophobic cavities of the β-cyclodextrin to form inclusion complexes, which are then made into microcapsules. This maximizes the protection of the active substances in the mangosteen peel extract during subsequent wet spinning. The microcapsules are then used in conjunction with a facial mask sheet and essence. The process also achieves the function of exfoliation and release; at the same time, hydroxyethyl cellulose is added to the viscose spinning solution. During the wet spinning process, hydroxyethyl cellulose forms a semi-interpenetrating network with viscose fibers (formed by spinning the viscose spinning solution), thereby improving the breaking strength of the mangosteen peel composite fiber and preventing breakage during the subsequent hydroentangling process, which would affect the strength of the mask base fabric. In addition, a step-by-step pressure increase method is used in the hydroentangling process to reduce the high-pressure needle punching time, thereby reducing fiber breakage and increasing the strength of the mask fabric; to address the color difference issue, in steps s1-4, the mangosteen peel filtrate is first concentrated, then decolorized by activated carbon, and then spray-dried to achieve second-level drying of the decolorized mangosteen peel solution; a two-dip and two-nip process is used to further supplement the mask base fabric with mangosteen peel extract to further enhance its antibacterial and antioxidant properties.

[0027] Although specific embodiments of the invention have been described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications can be conceived without departing from the spirit and scope of the invention.

Claims

1. A process for preparing a facial mask sheet based on mangosteen peel extract, characterized in that, Includes the following steps: s1. Mangosteen peel extract powder and β-cyclodextrin were encapsulated at a mass ratio of 0.2-0.35 to obtain active microcapsules; s2. The active microcapsules are blended with viscose spinning solution and hydroxyethyl cellulose, and then wet-spun to obtain mangosteen peel composite fiber, wherein the mass ratio of active microcapsules to viscose spinning solution is 0.05-0.15, and the mass ratio of hydroxyethyl cellulose to viscose spinning solution is 0.01-0.

03. s3. According to the following mass parts of raw materials: 25-30 parts of mangosteen peel composite fiber, 35-45 parts of viscose fiber, 15-20 parts of bamboo pulp fiber, and 5-10 parts of auxiliary fiber, the above raw materials are mixed and combed into a composite fiber web. After the composite fiber web is hydroentangled and reinforced, it is hot-pressed to form a mask fabric base.

2. The process for preparing a facial mask sheet based on mangosteen peel extract according to claim 1, characterized in that, The preparation method of mangosteen peel extract powder in step s1 is as follows: s1-1, take fresh mangosteen peel, wash it with water and drain it, and dry the drained mangosteen peel at a temperature of 50-60℃ until the peel moisture content is 3%-8%; s1-2. Crush the dried mangosteen peel and pass it through a 60-mesh sieve to obtain coarse mangosteen peel powder; s1-3. Mix the coarse powder of mangosteen peel with an ethanol solution of 50-60% concentration at a volume ratio of 0.1-0.2, stir under ultrasonic conditions for 30-60 minutes, and filter to obtain mangosteen peel filtrate. s1-4. After concentrating and drying the mangosteen peel filtrate, mangosteen peel extract powder is obtained.

3. A process for preparing a facial mask sheet based on mangosteen peel extract according to claim 2, characterized in that, In steps s1-4, the mangosteen peel filtrate is concentrated under reduced pressure to 0.15-0.25 of its original volume under vacuum conditions of 0.08-0.095 MPa and 50-60℃ to obtain mangosteen peel concentrate. Add activated carbon to the mangosteen peel concentrate, the amount of activated carbon being 2-5% of the mass of the mangosteen peel concentrate. Stir and decolorize at 40-50℃ for 20-40 minutes, then filter to remove the activated carbon, to obtain the decolorized mangosteen peel solution. The decolorized mangosteen peel liquid was spray-dried at an inlet air temperature of 150-170℃, an outlet air temperature of 75-85℃, and a feed flow rate of 10-20mL / min to obtain a mangosteen peel extract powder with a total xanthonone content ≥10%, a water content ≤5%, and a yield ≥8%.

4. The process for preparing a facial mask sheet based on mangosteen peel extract according to claim 1, characterized in that, In step s1, the embedding process is as follows: Mangosteen peel extract powder and β-cyclodextrin are mixed with water and then ground. The amount of water is 10%-20% of the mass of mangosteen peel extract powder. Grind until a homogeneous paste is formed. After spreading the paste thinly, place it in a vacuum drying oven and dry it at 40-50℃ for 6-10 hours to obtain a dried block with a moisture content of ≤5%. The dried lumps were pulverized and passed through a 100-mesh sieve to obtain active microcapsules.

5. A process for preparing a facial mask fabric based on mangosteen peel extract according to claim 1, characterized in that, In step s2, the coagulation bath temperature of wet spinning is 25-30℃, the coagulation bath is a sulfuric acid / sodium sulfate system, the stretching ratio after spinning is 2.0-3.0 times, and the fineness of the resulting mangosteen peel composite fiber is 1.2-1.8 dtex and the length is 38-51 mm.

6. A process for preparing a facial mask sheet based on mangosteen peel extract according to claim 1, characterized in that, In step s3, after the composite fibers are carded into a web, the areal density is controlled at 35-50 g / m²; the hydroentanglement reinforcement adopts a step-by-step pressure increase method, with the hydroentanglement pressure gradually increasing from 30 bar to 120 bar.

7. A process for preparing a facial mask fabric based on mangosteen peel extract according to claim 1 or 6, characterized in that, In step s3, the hot pressing temperature is 130-150℃ and the linear pressure is 0.3-0.6MPa.

8. A process for preparing a facial mask sheet based on mangosteen peel extract according to claim 1, characterized in that, In step s2, during the co-blending process, a cationic modifier of 0.5-1.5% by mass of the spinning solution is added. The cationic modifier is 3-chloro-2-hydroxypropyltrimethylammonium chloride.

9. A process for preparing a facial mask sheet based on mangosteen peel extract according to claim 1, characterized in that, After the hydroentanglement reinforcement in step s3 and before the hot pressing treatment, the hydroentangled nonwoven fabric is immersed in the finishing solution, and then dipped and rubbed twice, with a pick-up rate of 70-85%. The finishing solution contains 0.1-0.5 wt% mangosteen peel extract, 0.5-1.5 wt% glycerol and 0.05-0.3 wt% ε-polylysine.

10. A process for preparing a facial mask fabric based on mangosteen peel extract according to claim 1, characterized in that, The auxiliary fibers are made of cotton pulp fibers, and the viscose fibers are mixed with 5-15% by weight of irregular cross-section viscose fibers, which have Y-shaped or cross-shaped cross-sections.