Bacterial cellulose-birch juice freckle-removing and whitening mask and preparation method thereof

Abstract

The invention relates to the technical field of masks, in particular to a bacterial cellulose-birch juice freckle-removing and whitening mask and a preparation method thereof, and the bacterial cellulose-birch juice freckle-removing and whitening mask comprises the following raw materials: a mask base material, a modified mixed solution and essence; the mask base material is prepared by statically fermenting activated acetobacter xylinum in a natural culture solution; the modified mixed solution is prepared from bletilla striata gum, sericin and deionized water. Coconut water and birch juice are used as culture solutions, activated acetobacter xylinum is inoculated, a static fermentation technology is adopted to prepare the mask base material, the mask base material has the advantages of being simple, stable and safe in fermentation process, and a 3D net structure in the obtained mask base material provides good mechanical performance and water locking performance for the mask base material; through combined modification of bletilla striata gum and sericin, pores of an internal 3D net structure are reduced, the performance of the mask base material is further improved, the mask base material can sufficiently absorb essence, evaporation of the essence is reduced, the essence can better penetrate into the skin, and a good freckle removing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of facial masks, and specifically to a bacterial cellulose - birch sap freckle - removing and whitening facial mask and a preparation method thereof. Background Art

[0002] With the development of social economy and the improvement of people's living standards, beauty care has become a basic living need of people. Skin - care facial masks mainly utilize the short time of being applied on the face to isolate the outside air and dust, so as to quickly increase the skin temperature and dilate pores to meet the needs of deep moisturizing, whitening and moisturizing, anti - aging, balancing oil, repairing the skin barrier, etc. Facial masks are classified into non - woven fabric, silk, tencel, pure cotton, biological fiber, etc. according to the material.

[0003] Bacterial cellulose is a natural nanocellulose material obtained by microbial fermentation, which has the advantages of a three - dimensional network structure, a large specific surface area, high biological safety, biodegradability, etc. Using the prepared bacterial cellulose membrane as the facial mask substrate can endow it with characteristics such as soft texture, non - irritation, no peculiar smell, and super strong skin - affinity. However, the pores in the three - dimensional network structure inside this type of bacterial cellulose membrane are usually relatively large, resulting in poor anti - deformation ability and inability to lock the essence emulsion inside well, ultimately affecting the skin - care effect. Based on this, a bacterial cellulose - birch sap freckle - removing and whitening facial mask and a preparation method thereof are proposed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a bacterial cellulose - birch sap freckle - removing and whitening facial mask and a preparation method thereof. The facial mask substrate prepared by static fermentation is modified with bletilla striata gum and sericin, which can make the essence penetrate into the skin better and achieve a good freckle - removing effect.

[0005] To achieve the above object, the present invention provides the following technical solution: A bacterial cellulose - birch sap freckle - removing and whitening facial mask, comprising the following raw materials: a facial mask substrate, a modification mixture, and an essence; the facial mask substrate is prepared by static fermentation of activated acetobacter xylinum in a natural culture solution; the modification mixture is composed of bletilla striata gum, sericin, and deionized water.

[0006] Preferably, the preparation method of the facial mask substrate is as follows: S1. Uniformly mix coconut water and birch sap to obtain a natural culture solution; S2. Inoculate activated acetobacter xylinum into the natural culture solution, pour it into a facial mask mold after sufficient shaking, seal it with a silicone mold and let it stand for cultivation to form a bacterial cellulose membrane; S3. Take out the bacterial cellulose membrane in the natural culture solution, first wash away the excess culture solution and impurities with deionized water, then remove the bacteria in a high - temperature sodium hydroxide solution, and then rinse it with deionized water until neutral, and perform low - temperature freeze - drying treatment to obtain the facial mask substrate.

[0007] Preferably, in step S1, calculated by mass percentage of the natural culture solution, coconut water accounts for 5-20%, and birch sap accounts for 80-95%.

[0008] Preferably, in step S2, calculated by volume percentage of the natural culture solution, the inoculation amount of activated Acetobacter xylinum is 10-15%; the static culture temperature is 28-32 °C, and the static culture time is 7-10 d.

[0009] Preferably, in step S3, the concentration of the sodium hydroxide solution is 0.1 mol / L; the temperature of the sodium hydroxide solution is 80-90 °C.

[0010] Preferably, the preparation method of the modification mixture is as follows: Dispersing bletilla striata gum and sericin in deionized water to form a mixture; performing ultraviolet sterilization treatment on the mixture to obtain the modification mixture.

[0011] Preferably, calculated by mass percentage of the mixture, bletilla striata gum accounts for 1-3%, and sericin accounts for 3-5%.

[0012] Preferably, the preparation method of the essence is as follows: Putting pine needle essential oil, angelica dahurica extract, safflower extract, asarum volatile oil, pearl hydrolysate, peppermint essential oil, cynanchum atratum volatile oil, dioscorea panthaica extract, gypsum fibrosum powder, niacinamide, vitamin E, glycerol, sodium hyaluronate and deionized water into a high-speed blender, and stirring evenly to obtain the essence.

[0013] Preferably, calculated by weight parts, the essence includes: 0.1-0.2 parts of pine needle essential oil, 0.1-0.2 parts of angelica dahurica extract, 0.1-0.2 parts of safflower extract, 0.05-0.1 parts of asarum volatile oil, 0.1-0.3 parts of pearl hydrolysate, 0.1-0.2 parts of peppermint essential oil, 0.1-0.2 parts of cynanchum atratum volatile oil, 0.1-0.2 parts of dioscorea panthaica extract, 0.1-0.2 parts of gypsum fibrosum powder, 0.1-0.3 parts of niacinamide, 0.1-0.3 parts of vitamin E, 10-15 parts of glycerol, 0.1-0.3 parts of sodium hyaluronate and 150-180 parts of deionized water.

[0014] The present invention also provides a preparation method of a bacterial cellulose-birch sap freckle-removing and whitening mask, comprising the following steps: (1) Immersing the mask substrate in the modification mixture, standing for 2-5 d in a sterile environment, taking it out, rinsing it with sterile water until neutral, and performing low-temperature freeze-drying treatment; (2) Immersing the low-temperature freeze-dried mask substrate in the essence for 18-24 h to obtain the bacterial cellulose-birch sap freckle-removing and whitening mask.

[0015] The present invention provides a bacterial cellulose-birch sap freckle-removing and whitening mask and its preparation method, and has the following beneficial effects compared with the prior art: The present invention uses coconut water and birch sap as culture media, inoculates and activates Acetobacter xylinum, and adopts a static fermentation technology to prepare a mask substrate, which has the characteristics of simple, stable and safe fermentation process. The 3D network structure inside the obtained mask substrate provides good mechanical properties and water-locking properties; through the combined modification of bletilla striata gum and sericin, the pores of the internal 3D network structure are reduced, further improving the performance of the mask substrate, enabling it to fully absorb the essence and reduce the evaporation of the essence, allowing the essence to penetrate deeper into the skin and achieving a good freckle-removing effect.

[0016] The present invention modifies the mask substrate with a modification mixture. Among them, bletilla striata gum, sericin and the mask substrate can be intertwined with each other through hydrogen bonding. Some bletilla striata gum and sericin can also adhere to the internal pores of the mask substrate, forming a more dense 3D network structure, which can not only improve the water-holding capacity of the mask substrate, but also reduce the evaporation loss of the liquid, and also has a promoting effect on improving the anti-deformation ability of the mask substrate.

[0017] The essence used in the present invention is rich in plant essential oils, plant extracts, as well as niacinamide, vitamin E, etc., which work together to have the effect of improving the skin; for example, the coumarin components in angelica dahurica extract can play a role in whitening and anti-inflammatory; the total flavonoids of safflower in safflower extract and the steroidal saponins in dioscorea panthaica extract can play an anti-inflammatory and antioxidant role; niacinamide and vitamin E can play a role in whitening and lightening freckles, controlling oil and removing acne. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings: Figure 1 It is a product diagram of the bacterial cellulose membrane in Example 2 of the present invention; Figure 2 It is a scanning electron microscope image of the mask substrate in Example 2 of the present invention (Figure a) and a scanning electron microscope image of the mask substrate after being modified with the modification mixture and freeze-dried at low temperature in Example 8 (Figure b). DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following examples are used to detail the implementation manners of the present application, so as to fully understand how the present application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0020] The preparation method of the activated Acetobacter xylinum involved in the present invention is as follows: ① Prepare multiple groups of liquid media, which, by mass percentage, include 2.5% glucose, 1.2% yeast extract, 0.5% peptone, 0.5% sodium pyrophosphate, and 95.3% deionized water; ② Thaw the Acetobacter xylinum at room temperature and inoculate it into the liquid medium, and preliminarily culture it on a shaker at 30 °C for 40 h; ③ Re-inoculate the preliminarily cultured Acetobacter xylinum into a new liquid medium at an inoculation amount of 10% of the volume of the liquid medium, and continue to ferment and culture it at 30 °C for 45 h to obtain the activated Acetobacter xylinum.

[0021] The Angelica dahurica extract in the essence involved in the present invention mainly contains Angelica dahurica coumarin components; the Carthamus tinctorius extract mainly contains total flavonoids of Carthamus tinctorius; the Dioscorea panthaica extract mainly contains steroidal saponins.

[0022] Example 1 The preparation method of the mask substrate is as follows: S1. Uniformly mix coconut water and birch sap to obtain a natural culture solution; by mass percentage of the natural culture solution, coconut water accounts for 5% and birch sap accounts for 95%.

[0023] S2. Inoculate the activated Acetobacter xylinum into the natural culture solution, pour it into a mask mold after sufficient shaking, seal it with a silicone mold, and statically culture it at 28 °C for 10 d to form a bacterial cellulose membrane; by volume percentage of the natural culture solution, the inoculation amount of the activated Acetobacter xylinum is 10%.

[0024] S3. Take out the bacterial cellulose membrane in the natural culture solution, first wash away the excess culture solution and impurities with deionized water, then treat it in 0.1 mol / L sodium hydroxide solution at 80 °C for 30 min to remove the bacteria, and then rinse it with deionized water until neutral, and perform low-temperature freeze-drying treatment to obtain the mask substrate.

[0025] Example 2 The preparation method of the mask substrate is as follows: S1. Uniformly mix coconut water and birch sap to obtain a natural culture solution; by mass percentage of the natural culture solution, coconut water accounts for 20% and birch sap accounts for 80%.

[0026] S2. Inoculate the activated Acetobacter xylinum into the natural culture solution, pour it into a mask mold after sufficient shaking, seal it with a silicone mold, and statically culture it at 32 °C for 7 d to form a bacterial cellulose membrane; by volume percentage of the natural culture solution, the inoculation amount of the activated Acetobacter xylinum is 15%.

[0027] S3. Take out the bacterial cellulose membrane from the natural culture solution, first wash away the excess culture solution and impurities with deionized water, then treat it in 0.1 mol / L sodium hydroxide solution at 90 °C for 20 min to remove the bacteria, and then rinse it with deionized water until neutral, and perform low-temperature freeze-drying treatment to obtain the mask substrate.

[0028] Example 3 The preparation method of the modification mixture is as follows: Disperse the bletilla striata gum and sericin in deionized water to form a mixture; perform ultraviolet sterilization treatment on the mixture to obtain the modification mixture. Calculated by the mass percentage of the mixture, the bletilla striata gum accounts for 1%, and the sericin accounts for 3%.

[0029] Example 4 The preparation method of the modification mixture is as follows: Disperse the bletilla striata gum and sericin in deionized water to form a mixture; perform ultraviolet sterilization treatment on the mixture to obtain the modification mixture. Calculated by the mass percentage of the mixture, the bletilla striata gum accounts for 3%, and the sericin accounts for 5%.

[0030] Example 5 The preparation method of the essence is as follows: By weight, weigh 0.2 parts of pine needle essential oil, 0.1 part of angelica dahurica extract, 0.2 part of safflower extract, 0.05 part of asarum volatile oil, 0.3 part of pearl hydrolyzate, 0.1 part of peppermint essential oil, 0.2 part of cynanchum atratum volatile oil, 0.1 part of dioscorea panthaica extract, 0.2 part of gypsum fibrosum, 0.1 part of nicotinamide, 0.3 part of vitamin E, 10 parts of glycerol, 0.3 part of sodium hyaluronate and 150 parts of deionized water, put them into a high-speed blender, and after stirring evenly, obtain the essence.

[0031] Example 6 The preparation method of the essence is as follows: By weight, weigh 0.1 part of pine needle essential oil, 0.2 part of angelica dahurica extract, 0.1 part of safflower extract, 0.1 part of asarum volatile oil, 0.1 part of pearl hydrolyzate, 0.2 part of peppermint essential oil, 0.1 part of cynanchum atratum volatile oil, 0.2 part of dioscorea panthaica extract, 0.1 part of gypsum fibrosum, 0.3 part of nicotinamide, 0.1 part of vitamin E, 15 parts of glycerol, 0.1 part of sodium hyaluronate and 180 parts of deionized water, put them into a high-speed blender, and after stirring evenly, obtain the essence.

[0032] Example 7 A preparation method of a bacterial cellulose - birch sap freckle-removing and whitening mask, comprising the following steps: (1) Immerse the mask substrate in the modification mixture, stand still in a sterile environment for 2 d, take it out, rinse it with sterile water until neutral, and perform low-temperature freeze-drying treatment; (2) Immerse the mask substrate after low-temperature freeze-drying in the essence for 24 h to obtain the bacterial cellulose - birch sap freckle-removing and whitening mask.

[0033] In this embodiment, the mask substrate in Embodiment 1, the modified mixture in Embodiment 4, and the essence in Embodiment 5 are used.

[0034] Embodiment 8 A method for preparing a bacterial cellulose - birch sap freckle - removing and whitening mask, comprising the following steps: (1) Immerse the mask substrate in the modified mixture, leave it standing in a sterile environment for 4 days, take it out, rinse it with sterile water until neutral, and perform low - temperature freeze - drying treatment; (2) Immerse the low - temperature freeze - dried mask substrate in the essence for 20 h to obtain the bacterial cellulose - birch sap freckle - removing and whitening mask.

[0035] In this embodiment, the mask substrate in Embodiment 2, the modified mixture in Embodiment 3, and the essence in Embodiment 6 are used.

[0036] Embodiment 9 A method for preparing a bacterial cellulose - birch sap freckle - removing and whitening mask, comprising the following steps: (1) Immerse the mask substrate in the modified mixture, leave it standing in a sterile environment for 5 days, take it out, rinse it with sterile water until neutral, and perform low - temperature freeze - drying treatment; (2) Immerse the low - temperature freeze - dried mask substrate in the essence for 18 h to obtain the bacterial cellulose - birch sap freckle - removing and whitening mask.

[0037] In this embodiment, the mask substrate in Embodiment 1, the modified mixture in Embodiment 3, and the essence in Embodiment 5 are used.

[0038] Comparative Example 1 A method for preparing a bacterial cellulose - birch sap freckle - removing and whitening mask, comprising the following steps: Immerse the mask substrate in the essence for 20 h to obtain the bacterial cellulose - birch sap freckle - removing and whitening mask.

[0039] In this comparative example, the mask substrate in Embodiment 2 and the essence in Embodiment 6 are used.

[0040] Comparative Example 2 A method for preparing a bacterial cellulose - birch sap freckle - removing and whitening mask, comprising the following steps: (1) Immerse the mask substrate in the modified mixture, leave it standing in a sterile environment for 4 days, take it out, rinse it with sterile water until neutral, and perform low - temperature freeze - drying treatment; (2) Immerse the low - temperature freeze - dried mask substrate in the essence for 20 h to obtain the bacterial cellulose - birch sap freckle - removing and whitening mask.

[0041] The preparation method of the above-mentioned modified mixture is as follows: Dispersing Bletilla striata gum in deionized water to form a mixture; performing ultraviolet sterilization treatment on the mixture to obtain the modified mixture. Calculated by the mass percentage of the mixture, Bletilla striata gum accounts for 1%.

[0042] In this comparative example, the mask substrate in Example 2 and the essence in Example 6 are used.

[0043] Comparative Example 3 A preparation method of a bacterial cellulose - birch sap freckle - removing and whitening mask comprises the following steps: (1) Immersing the mask substrate in the modified mixture, standing for 4 d in a sterile environment, taking it out, rinsing it with sterile water until neutral, and performing low - temperature freeze - drying treatment; (2) Immersing the mask substrate after low - temperature freeze - drying in the essence for 20 h to obtain the bacterial cellulose - birch sap freckle - removing and whitening mask.

[0044] The preparation method of the above - mentioned modified mixture is as follows: Dispersing sericin in deionized water to form a mixture; performing ultraviolet sterilization treatment on the mixture to obtain the modified mixture. Calculated by the mass percentage of the mixture, sericin accounts for 3%.

[0045] In this comparative example, the mask substrate in Example 2 and the essence in Example 6 are used.

[0046] Quality inspection 1. Taking the mask substrates after the first low - temperature freeze - drying treatment in Examples 7 - 9 and Comparative Examples 1 - 3 as test specimens. The mask substrates have been soaked and modified with the modified mixture and then subjected to low - temperature freeze - drying treatment (except for Comparative Example 1), but have not been immersed in the essence yet, and are denoted as modified mask substrates.

[0047] Tensile strength and elongation at break: Detecting the specimens with reference to the standard of GB / T 1040.3 - 2006; Water vapor transmission rate: Detecting the specimens with reference to the standard of GB / T 1037 - 2021; Water - holding performance: Weighing the mask substrate, denoted as ; then putting the mask substrate into deionized water, taking it out after soaking for 24 h, drying the surface moisture and weighing it, denoted as , and the moisture content The calculation formula is as follows: The specific test results are shown in the following table.

[0048] Table 1 Performance of the modified mask substrate

[0049] As can be seen from the above table: (1) In each embodiment, the modified mask substrate generally has a relatively high tensile strength and a relatively low elongation at break, indicating that such a modified mask substrate has excellent anti-deformation ability; at the same time, it has a relatively low water vapor transmission rate and a relatively high water retention performance, indicating that after the mask substrate is modified by the combined action of bletilla striata gum and sericin, the overall performance has been improved.

[0050] (2) Compared with Example 8, the mask substrate in Comparative Example 1 is not modified by bletilla striata gum and sericin, and its performance in terms of mechanical properties, water vapor transmission rate and water retention performance is far inferior to that of the modified mask substrate in Example 8.

[0051] (3) Compared with Example 8, the modified mask substrates in Comparative Examples 2 and 3 are modified with bletilla striata gum or sericin alone, and their performance in various aspects is slightly inferior to that of the modified mask substrate in Example 8.

[0052] (4) The provided non-woven mask substrate performs worse than the mask substrate and the modified mask substrate in the present invention in various aspects.

[0053] 2. Take the bacterial cellulose-birch sap freckle-removing and whitening masks in Example 8 and Comparative Examples 1-3 as test samples.

[0054] Select 30 subjects, including 10 males and 20 females, aged 20 to 35 years old. The average number of facial acne of the 30 subjects is 2.5, the average number of facial solar lentigines is 2.1, and the average number of facial melasma is 1.7. After 21 days of using the mask, statistics are carried out again, and the reduction rate is calculated.

[0055] Acne reduction rate = (number of acne before using the mask - number of acne after using the mask) / number of acne before using the mask × 100%; Solar lentigines reduction rate = (number of solar lentigines before using the mask - number of solar lentigines after using the mask) / number of solar lentigines before using the mask × 100%; Melasma reduction rate = (number of melasma before using the mask - number of melasma after using the mask) / number of melasma before using the mask × 100%; The specific results are shown in the following table.

[0056] Table 2 Freckle-removing effect

[0057] As can be seen from the above table, the bacterial cellulose-birch sap freckle-removing and whitening facial mask in Example 8 has good freckle-removing and acne-removing effects. The freckle-removing and acne-removing effects of the bacterial cellulose-birch sap freckle-removing and whitening facial masks in Comparative Examples 1-3 are inferior to those in Example 8. This should be due to the quality problems of the mask substrates or the modified mask substrates in Comparative Examples 1-3, which result in their inability to fully absorb the essence or cause the essence to be lost more quickly during facial application, affecting the long-term improvement of the facial skin by the essence.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bacterial cellulose - birch sap freckle - removing and skin - whitening facial mask, characterized in that, It includes the following raw materials: a facial mask substrate, a modification mixture, and a essence liquid; The facial mask substrate is prepared by static fermentation of activated Acetobacter xylinum in a natural culture solution; The modification mixture is composed of Bletilla striata gum, sericin, and deionized water.

2. The bacterial cellulose-birch sap freckle-removing and whitening facial mask according to claim 1, wherein The preparation method of the facial mask substrate is as follows: S1. Uniformly mix coconut water and birch sap to obtain a natural culture solution; S2. Inoculate activated Acetobacter xylinum into the natural culture solution, pour it into a facial mask mold after sufficient shaking, seal it with a silicone mold and let it stand for cultivation to form a bacterial cellulose membrane; S3. Take out the bacterial cellulose membrane from the natural culture solution, first wash away the excess culture solution and impurities with deionized water, then remove the bacteria in a high-temperature sodium hydroxide solution, and then wash it with deionized water until neutral, and then perform low-temperature freeze-drying treatment to obtain the facial mask substrate.

3. The bacterial cellulose - birch sap freckle and whitening facial mask according to claim 2, characterized in that In step S1, calculated by the mass percentage of the natural culture solution, coconut water accounts for 5-20%, and birch sap accounts for 80-95%.

4. A bacterial cellulose - birch sap freckle - removing and whitening facial mask according to claim 2, characterized in that, In step S2, calculated by the volume percentage of the natural culture solution, the inoculation amount of activated Acetobacter xylinum is 10-15%; the static cultivation temperature is 28-32 °C, and the static cultivation time is 7-10 d.

5. A bacterial cellulose - birch sap freckle - removing and skin - whitening facial mask according to claim 2, wherein, In step S3, the concentration of the sodium hydroxide solution is 0.1 mol / L; the temperature of the sodium hydroxide solution is 80-90 °C.

6. A bacterial cellulose - birch sap freckle - removing and skin - whitening facial mask according to claim 1, characterized in that, The preparation method of the modification mixture is as follows: Disperse Bletilla striata gum and sericin in deionized water to form a mixture; perform ultraviolet sterilization treatment on the mixture to obtain the modification mixture.

7. A bacterial cellulose-birch sap freckle-removing and skin-whitening facial mask according to claim 6, characterized in that Calculated by the mass percentage of the mixture, Bletilla striata gum accounts for 1-3%, and sericin accounts for 3-5%.

8. A bacterial cellulose - birch sap freckle - removing and skin - whitening facial mask according to claim 1, characterized in that, The preparation method of the essence liquid is as follows: Put pine needle essential oil, Angelica dahurica extract, safflower extract, Asarum volatile oil, hydrolyzed pearl, peppermint essential oil, Cynanchum atratum volatile oil, Dioscorea panthaica extract, gypsum fibrosum powder, niacinamide, vitamin E, glycerol, sodium hyaluronate, and deionized water into a high-speed blender, and stir evenly to obtain the essence liquid.

9. The preparation method of a bacterial cellulose - birch sap freckle - removing and whitening facial mask according to claim 8, characterized in that, Calculated by weight, the essence liquid includes: 0.1-0.2 parts of pine needle essential oil, 0.1-0.2 parts of Angelica dahurica extract, 0.1-0.2 parts of safflower extract, 0.05-0.1 parts of Asarum volatile oil, 0.1-0.3 parts of hydrolyzed pearl, 0.1-0.2 parts of peppermint essential oil, 0.1-0.2 parts of Cynanchum atratum volatile oil, 0.1-0.2 parts of Dioscorea panthaica extract, 0.1-0.2 parts of gypsum fibrosum powder, 0.1-0.3 parts of niacinamide, 0.1-0.3 parts of vitamin E, 10-15 parts of glycerol, 0.1-0.3 parts of sodium hyaluronate, and 150-180 parts of deionized water.

10. The preparation method of a bacterial cellulose - birch sap freckle - removing and skin - whitening facial mask according to any one of claims 1 - 9, characterized in that, It includes the following steps: (1) Immerse the facial mask substrate in the modification mixture, stand it in a sterile environment for 2-5 d, take it out and wash it with sterile water until neutral, and perform low-temperature freeze-drying treatment; (2) Immerse the low-temperature freeze-dried facial mask substrate in the essence liquid for 18-24 h to obtain a bacterial cellulose-birch sap freckle-removing and whitening facial mask.

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